diff --git a/doc/benchmark.md b/doc/benchmark.md
index da0f094..6c3d3be 100644
--- a/doc/benchmark.md
+++ b/doc/benchmark.md
@@ -110,3 +110,15 @@ And we use this bf interpreter to draw a mandelbrot set.
 In 2022/2/17 update we added `\e` into the lexer. And the `bfcolored.nas` uses this special ASCII code. Here is the result:
 
 ![mandelbrot](../doc/pic/mandelbrot.png)
+
+## More nasal generated pictures
+
+![mandelbrotset](../doc/pic/mandelbrotset.png)
+
+![mandelbrotset_reverse](../doc/pic/mandelbrotset_reverse.png)
+
+![burningship](../doc/pic/burningship.png)
+
+![burningship_reverse](../doc/pic/burningship_reverse.png)
+
+![feigenbaum](../doc/pic/feigenbaum.png)
diff --git a/doc/nasal-http-test-web.html b/doc/nasal-http-test-web.html
index d2c2e83..e452a00 100644
--- a/doc/nasal-http-test-web.html
+++ b/doc/nasal-http-test-web.html
@@ -128,10 +128,10 @@
                         <li><a href="/lexer.nas">lexer.nas</a></li>
                         <li><a href="/life.nas">life.nas</a></li>
                         <li><a href="/loop.nas">loop.nas</a></li>
-                        <li><a href="/mandel.nas">mandel.nas</a></li>
                         <li><a href="/mandelbrot.nas">mandelbrot.nas</a></li>
+                        <li><a href="/mandelbrotset.nas">mandelbrotset.nas</a></li>
                         <li><a href="/mcpu.nas">mcpu.nas</a></li>
-                        <li><a href="/md5.nas">md5.nas</a></li>
+                        <li><a href="/md5_self.nas">md5_self.nas</a></li>
                         <li><a href="/md5compare.nas">md5compare.nas</a></li>
                     </ul>
                 </td>
diff --git a/doc/pic/mandelbrotset.png b/doc/pic/mandelbrotset.png
new file mode 100644
index 0000000..a6b541d
Binary files /dev/null and b/doc/pic/mandelbrotset.png differ
diff --git a/module/libfib.nas b/module/libfib.nas
index a42ed9b..18819a7 100644
--- a/module/libfib.nas
+++ b/module/libfib.nas
@@ -44,7 +44,7 @@ var print_ghost = func(object) {
 }
 
 
-var test_ghost=func() {
+var test_ghost = func() {
     var ghost = create_ghost();
     print_ghost(nil); # err
     print_ghost(ghost); # random
diff --git a/module/libkey.nas b/module/libkey.nas
index 829e99c..564266b 100644
--- a/module/libkey.nas
+++ b/module/libkey.nas
@@ -11,8 +11,8 @@ var (
     var nb = lib.nas_noblock;
     var call = dylib.limitcall(0);
     return [
-        func(){return call(kb);},
-        func(){return call(gt);},
-        func(){return call(nb);}
+        func() {return call(kb);},
+        func() {return call(gt);},
+        func() {return call(nb);}
     ];
 }();
diff --git a/std/csv.nas b/std/csv.nas
index 94800a9..7423360 100644
--- a/std/csv.nas
+++ b/std/csv.nas
@@ -1,12 +1,12 @@
 # lib csv.nas
 # ValKmjolnir 2022/10/15
-var read = func(path, delimeter=",", endline="\n"){
+var read = func(path, delimeter=",", endline="\n") {
     var context = io.readfile(path);
     context = split(endline, context);
-    forindex(var i;context){
+    forindex(var i;context) {
         context[i] = split(delimeter,context[i]);
     }
-    if(size(context)<=1){
+    if (size(context)<=1) {
         die("incorrect csv file <"~path~">: "~size(context)~" line(s).");
     }
     return {
diff --git a/std/dylib.nas b/std/dylib.nas
index f65c397..92f5bcf 100644
--- a/std/dylib.nas
+++ b/std/dylib.nas
@@ -7,7 +7,7 @@
 var dlopen = func(libname) {
     # find dynamic lib from local dir first
     libname = (os.platform()=="windows"? ".\\":"./")~libname;
-    if(io.exists(libname))
+    if (io.exists(libname))
         return __dlopen(libname);
     # find dynamic lib through PATH
     var envpath = split(os.platform()=="windows"? ";":":",unix.getenv("PATH"));
@@ -16,7 +16,7 @@ var dlopen = func(libname) {
     var path = os.platform()=="windows"? "\\module\\":"/module/";
     foreach(var p;envpath) {
         p ~= path~libname;
-        if(io.exists(p)) {
+        if (io.exists(p)) {
             libname = p;
             break;
         }
@@ -37,14 +37,14 @@ var dlcall = func(ptr, args...) {
 
 # get dlcall function with limited parameter list
 var limitcall = func(arg_size = 0) {
-    if(arg_size==0) {return func(ptr) {return __dlcall};}
-    elsif(arg_size==1) {return func(ptr, _0) {return __dlcall};}
-    elsif(arg_size==2) {return func(ptr, _0, _1) {return __dlcall};}
-    elsif(arg_size==3) {return func(ptr, _0, _1, _2) {return __dlcall};}
-    elsif(arg_size==4) {return func(ptr, _0, _1, _2, _3) {return __dlcall};}
-    elsif(arg_size==5) {return func(ptr, _0, _1, _2, _3, _4) {return __dlcall};}
-    elsif(arg_size==6) {return func(ptr, _0, _1, _2, _3, _4, _5) {return __dlcall};}
-    elsif(arg_size==7) {return func(ptr, _0, _1, _2, _3, _4, _5, _6) {return __dlcall};}
-    elsif(arg_size==8) {return func(ptr, _0, _1, _2, _3, _4, _5, _6, _7) {return __dlcall};}
+    if (arg_size==0) {return func(ptr) {return __dlcall};}
+    elsif (arg_size==1) {return func(ptr, _0) {return __dlcall};}
+    elsif (arg_size==2) {return func(ptr, _0, _1) {return __dlcall};}
+    elsif (arg_size==3) {return func(ptr, _0, _1, _2) {return __dlcall};}
+    elsif (arg_size==4) {return func(ptr, _0, _1, _2, _3) {return __dlcall};}
+    elsif (arg_size==5) {return func(ptr, _0, _1, _2, _3, _4) {return __dlcall};}
+    elsif (arg_size==6) {return func(ptr, _0, _1, _2, _3, _4, _5) {return __dlcall};}
+    elsif (arg_size==7) {return func(ptr, _0, _1, _2, _3, _4, _5, _6) {return __dlcall};}
+    elsif (arg_size==8) {return func(ptr, _0, _1, _2, _3, _4, _5, _6, _7) {return __dlcall};}
     else {return func(ptr, args...) {return __dlcallv};}
 }
\ No newline at end of file
diff --git a/std/fg_env.nas b/std/fg_env.nas
index 0479a35..bba128a 100644
--- a/std/fg_env.nas
+++ b/std/fg_env.nas
@@ -1,6 +1,7 @@
 # flightgear developer environments simulator (beta)
 # ValKmjolnir 2022
 use std.runtime;
+use std.coroutine;
 
 println("-------------------------------------------------------------");
 println(" FlightGear simulated-env for developers project, since 2019");
@@ -15,8 +16,8 @@ var fg_env_cli={
     "--fg-env-help":{
         info:"get help",
         trigger:0,
-        f:func{
-            if(me.trigger)
+        f:func {
+            if (me.trigger)
                 return;
             println("-------------------------------------------------------------");
             println(" Help:");
@@ -29,8 +30,8 @@ var fg_env_cli={
     "--fg-env-debug":{
         info:"get property tree structure",
         trigger:0,
-        f:func{
-            if(me.trigger)
+        f:func {
+            if (me.trigger)
                 return;
             props.globals.debug();
             me.trigger=1;
@@ -39,8 +40,8 @@ var fg_env_cli={
     "--fg-env-mktmtest":{
         info:"test maketimer",
         trigger:0,
-        f:func{
-            if(me.trigger)
+        f:func {
+            if (me.trigger)
                 return;
             maketimer_multi_coroutine_test(32);
             me.trigger=1;
@@ -57,8 +58,8 @@ var fg_globals={
 };
 
 println("[\e[32m maketimer \e[0m] [",os.time(),"] new func add_event(name,interval,function)");
-var add_event=func(name,interval,function){
-    fg_globals.event[name]=coroutine.create(func{
+var add_event = func(name,interval,function) {
+    fg_globals.event[name]=coroutine.create(func {
         var timestamp=maketimestamp();
         timestamp.stamp();
         while(timestamp.elapsedMSec()<interval*1000)
@@ -69,11 +70,11 @@ var add_event=func(name,interval,function){
 }
 
 println("[\e[32m maketimer \e[0m] [",os.time(),"] new func add_task(name,interval,function)");
-var add_task=func(name,interval,function){
-    fg_globals.task[name]=coroutine.create(func{
+var add_task = func(name,interval,function) {
+    fg_globals.task[name]=coroutine.create(func {
         var counter=0;
         var timestamp=maketimestamp();
-        while(1){
+        while(1) {
             counter+=1;
             timestamp.stamp();
             while(timestamp.elapsedMSec()<interval*1000)
@@ -86,38 +87,38 @@ var add_task=func(name,interval,function){
 }
 
 println("[\e[32m maketimer \e[0m] [",os.time(),"] new func remove_task(name)");
-var remove_task=func(name){
-    if(contains(fg_globals.task,name))
+var remove_task = func(name) {
+    if (contains(fg_globals.task,name))
         delete(fg_globals.task,name);
 }
 
 println("[\e[32m maketimer \e[0m] [",os.time(),"] new func remove_event(name)");
-var remove_event=func(name){
-    if(contains(fg_globals.event,name))
+var remove_event = func(name) {
+    if (contains(fg_globals.event,name))
         delete(fg_globals.event,name);
 }
 
 println("[\e[32m maketimer \e[0m] [",os.time(),"] new func maketimer(interval,function)");
-var maketimer=func(interval,function){
+var maketimer = func(interval,function) {
     var name="nasal-timer-";
     var res={
-        start:func{
-            if(me.isRunning)
+        start:func {
+            if (me.isRunning)
                 return;
             me.isRunning=1;
-            if(me.singleShot){
+            if (me.singleShot) {
                 add_event(name,interval,function);
-            }else{
+            } else {
                 add_task(name,interval,function);
             }
         },
-        stop:func{
-            if(me.isRunning){
+        stop:func {
+            if (me.isRunning) {
                 remove_task(name);
                 me.isRunning=0;
             }
         },
-        restart:func(itv){
+        restart:func(itv) {
             interval=itv;
             me.stop();
             me.start();
@@ -131,9 +132,9 @@ var maketimer=func(interval,function){
 }
 
 println("[\e[32m settimer  \e[0m] [",os.time(),"] new func settimer(function,interval,rt)");
-var settimer=func(){
+var settimer = func() {
     var index=0;
-    return func(function,interval,realtime=1){
+    return func(function,interval,realtime=1) {
         var name="nasal-settimer-"~index;
         index+=1;
         add_task(name,interval,function);
@@ -141,25 +142,25 @@ var settimer=func(){
 }();
 
 println("[\e[32m maketimer \e[0m] [",os.time(),"] test func simulation()");
-var simulation=func(){
+var simulation = func() {
     var running=1;
-    while(running){
+    while(running) {
         running=0;
-        foreach(var i;keys(fg_globals.task)){
-            if(!contains(fg_globals.task,i))
+        foreach(var i;keys(fg_globals.task)) {
+            if (!contains(fg_globals.task,i))
                 continue;
-            if(coroutine.resume(fg_globals.task[i])!=nil){
+            if (coroutine.resume(fg_globals.task[i])!=nil) {
                 running=1;
-            }else{
+            } else {
                 remove_task(i);
             }
         }
-        foreach(var i;keys(fg_globals.event)){
-            if(!contains(fg_globals.event,i))
+        foreach(var i;keys(fg_globals.event)) {
+            if (!contains(fg_globals.event,i))
                 continue;
-            if(coroutine.resume(fg_globals.event[i])!=nil){
+            if (coroutine.resume(fg_globals.event[i])!=nil) {
                 running=1;
-            }else{
+            } else {
                 remove_event(i);
             }
         }
@@ -167,14 +168,14 @@ var simulation=func(){
 }
 
 println("[\e[32m maketimer \e[0m] [",os.time(),"] test func maketimer_multi_coroutine_test(size)");
-var maketimer_multi_coroutine_test=func(coroutine_size){
-    if(coroutine_size<1)
+var maketimer_multi_coroutine_test = func(coroutine_size) {
+    if (coroutine_size<1)
         return;
     var task_vec=[];
     setsize(task_vec,coroutine_size);
     forindex(var i;task_vec)
-        task_vec[i]=func{};
-    task_vec[coroutine_size-1]=func{
+        task_vec[i] = func {};
+    task_vec[coroutine_size-1] = func {
         println("\e[101m",coroutine_size," tasks invoked.\e[0m");
         forindex(var i;task_vec)
             task_vec[i].stop();
@@ -182,23 +183,23 @@ var maketimer_multi_coroutine_test=func(coroutine_size){
     var event_vec=[];
     setsize(event_vec,coroutine_size);
     forindex(var i;event_vec)
-        event_vec[i]=func{};
-    event_vec[coroutine_size-1]=func{
+        event_vec[i] = func {};
+    event_vec[coroutine_size-1] = func {
         println("\e[101m",coroutine_size," events invoked.\e[0m");
     }
     var set_vec=[];
     setsize(set_vec,coroutine_size);
     forindex(var i;set_vec)
-        set_vec[i]=func{};
-    set_vec[coroutine_size-1]=func{
+        set_vec[i] = func {};
+    set_vec[coroutine_size-1] = func {
         println("\e[101m",coroutine_size," settimer invoked.\e[0m");
     }
 
-    forindex(var i;task_vec){
+    forindex(var i;task_vec) {
         task_vec[i]=maketimer((i+1)/10,task_vec[i]);
         task_vec[i].start();
     }
-    forindex(var i;event_vec){
+    forindex(var i;event_vec) {
         event_vec[i]=maketimer((i+1)/10,event_vec[i]);
         event_vec[i].singleShot=1;
         event_vec[i].start();
@@ -209,7 +210,7 @@ var maketimer_multi_coroutine_test=func(coroutine_size){
 }
 
 println("[\e[32m geodinfo  \e[0m] [",os.time(),"] init geodinfo(lat,lon)");
-var geodinfo=func(lat,lon){
+var geodinfo = func(lat,lon) {
     return [nil,{
         names:["Road","Freeway"]
     }];
@@ -219,14 +220,14 @@ println("[\e[32m props     \e[0m] [",os.time(),"] init props");
 var props={
     globals:nil,
     Node:nil,
-    getNode:func(path,index){
+    getNode:func(path,index) {
         path=split('/',path);
         var tmp=me.globals;
         var path_size=size(path);
         for(var i=0;i<path_size-1;i+=1)
             tmp=tmp.val[path[i]];
-        if(path_size>0){
-            if(contains(tmp.val,path[i]~'['~index~']'))
+        if (path_size>0) {
+            if (contains(tmp.val,path[i]~'['~index~']'))
                 return tmp.val[path[i]~'['~index~']'];
             else
                 return tmp.val[path[i]];
@@ -238,89 +239,89 @@ var props={
 println("[\e[32m props     \e[0m] [",os.time(),"] init props.Node");
 
 props.Node={
-    new:func(values=nil){
+    new:func(values=nil) {
         var res={
             parents:fg_env_props_node_traits,
             val:{},
             type:'GHOST',
             parent:nil
         };
-        if(typeof(values)=="hash")
+        if (typeof(values)=="hash")
             res.val=values;
         return res;
     },
-    addChild:func(name){
-        if(!contains(me.val,name)){
+    addChild:func(name) {
+        if (!contains(me.val,name)) {
             me.val[name]=props.Node.new();
             me.val[name].parent=me;
             return 1;
         }
         return 0;
     },
-    addChildren:func(name,cnt=0){
-        for(var i=0;i<cnt;i+=1){
+    addChildren:func(name,cnt=0) {
+        for(var i=0;i<cnt;i+=1) {
             var label=name~'['~i~']';
             me.val[label]=props.Node.new();
             me.val[label].parent=me;
         }
         return;
     },
-    setValue:func(path,val){
+    setValue:func(path,val) {
         path=split('/',path);
         var tmp=me;
         foreach(var label;path)
             tmp=tmp.val[label];
         tmp.val=val;
-        if(typeof(val)=='str'){
-            if(val=='true' or val=='false')
+        if (typeof(val)=='str') {
+            if (val=='true' or val=='false')
                 tmp.type='BOOL';
             else
                 tmp.type='STRING';
         }
-        elsif(typeof(val)=='num')
+        elsif (typeof(val)=='num')
             tmp.type='DOUBLE';
         return;
     },
-    setIntValue:func(num){
+    setIntValue:func(num) {
         me.val=num;
         me.type='INT';
         return;
     },
-    setBoolValue:func(state){
+    setBoolValue:func(state) {
         me.val=state;
         me.type='BOOL';
         return;
     },
-    setDoubleValue:func(num){
+    setDoubleValue:func(num) {
         me.val=num;
         me.type='DOUBLE';
         return;
     },
-    getValue:func(){return me.val;},
-    getName:func(){
+    getValue:func() {return me.val;},
+    getName:func() {
         var val=me.parent.val;
         foreach(var k;keys(val))
-            if(val[k]==me)
+            if (val[k]==me)
                 return k;
         return '';
     },
-    getParent:func(){
+    getParent:func() {
         return me.parent;
     },
-    getPath:func(){
-        if(me.parent==nil) return '';
+    getPath:func() {
+        if (me.parent==nil) return '';
         return me.parent.getPath()~'/'~me.getName();
     },
-    equals:func(node){return me==node;},
-    debug:func(s=''){
-        if(typeof(me.val)=='hash'){
+    equals:func(node) {return me==node;},
+    debug:func(s='') {
+        if (typeof(me.val)=='hash') {
             var key=keys(me.val);
-            if(!size(key)){
+            if (!size(key)) {
                 println("\e[91m{}\e[0m");
                 return;
             }
             println('\e[91m{\e[0m');
-            foreach(var k;key){
+            foreach(var k;key) {
                 print(s~"   ","\e[34m",k,"\e[0m\e[95m:\e[0m");
                 me.val[k].debug(s~"   ");
             }
@@ -352,7 +353,7 @@ props.getNode("/consumables/fuel",1).addChild("total-gal_us");
 props.getNode("/consumables/fuel/total-fuel-lbs",1).setValue('/',0);
 props.getNode("/consumables/fuel/total-gal_us",1).setValue('/',0);
 props.getNode("/consumables/fuel",1).addChildren("tank",4);
-for(var i=0;i<4;i+=1){
+for(var i=0;i<4;i+=1) {
     props.getNode("/consumables/fuel/tank["~i~"]",1).addChild("level-lb");
     props.getNode("/consumables/fuel/tank["~i~"]",1).addChild("level-lbs");
     props.getNode("/consumables/fuel/tank["~i~"]",1).addChild("level-gal_us");
@@ -374,7 +375,7 @@ println("[\e[32m props     \e[0m] [",os.time(),"] init /controls/anti-ice");
 foreach(var i;['wing-heat','pitot-heat','wiper','window-heat'])
     props.getNode("/controls/anti-ice",1).addChild(i);
 props.getNode("/controls/anti-ice",1).addChildren("engine",2);
-for(var i=0;i<2;i+=1){
+for(var i=0;i<2;i+=1) {
     props.getNode("/controls/anti-ice/engine["~i~"]",1).addChild("carb-heat");
     props.getNode("/controls/anti-ice/engine["~i~"]",1).addChild("inlet-heat");
 }
@@ -388,7 +389,7 @@ props.getNode("/controls/armament",1).addChild("master-arm");
 props.getNode("/controls/armament",1).addChild("station-select");
 props.getNode("/controls/armament",1).addChild("release-all");
 props.getNode("/controls/armament",1).addChildren("station",4);
-for(var i=0;i<4;i+=1){
+for(var i=0;i<4;i+=1) {
     props.getNode("/controls/armament/station["~i~"]",1).addChild("stick-size");
     props.getNode("/controls/armament/station["~i~"]",1).addChild("release-stick");
     props.getNode("/controls/armament/station["~i~"]",1).addChild("release-all");
@@ -406,7 +407,7 @@ println("[\e[32m props     \e[0m] [",os.time(),"] init /controls/electric");
 foreach(var i;['battery-switch','external-power','APU-generator'])
     props.getNode("/controls/electric",1).addChild(i);
 props.getNode("/controls/electric",1).addChildren("engine",2);
-for(var i=0;i<2;i+=1){
+for(var i=0;i<2;i+=1) {
     props.getNode("/controls/electric/engine["~i~"]",1).addChild("generator");
     props.getNode("/controls/electric/engine["~i~"]",1).addChild("bus-tie");
 }
@@ -425,7 +426,7 @@ foreach(var i;['aileron','aileron-trim','elevator','elevator-trim','rudder','rud
 println("[\e[32m props     \e[0m] [",os.time(),"] init /controls/fuel");
 props.getNode("/controls/fuel",1).addChild("dump-value");
 props.getNode("/controls/fuel",1).addChildren("tank",4);
-for(var i=0;i<4;i+=1){
+for(var i=0;i<4;i+=1) {
     foreach(var j;['fuel-selector','to_engine','to_tank'])
         props.getNode("/controls/fuel/tank["~i~"]",1).addChild(j);
     props.getNode("/controls/fuel/tank["~i~"]",1).addChildren("boost-pump",4);
@@ -440,7 +441,7 @@ for(var i=0;i<4;i+=1)
 
 println("[\e[32m props     \e[0m] [",os.time(),"] init /controls/hydraulic");
 props.getNode("/controls/hydraulic",1).addChildren("system",2);
-for(var i=0;i<2;i+=1){
+for(var i=0;i<2;i+=1) {
     props.getNode("/controls/hydraulic/system["~i~"]",1).addChild("engine-pump");
     props.getNode("/controls/hydraulic/system["~i~"]",1).addChild("electric-pump");
 }
@@ -466,7 +467,7 @@ println("[\e[32m props     \e[0m] [",os.time(),"] init /controls/seat");
 foreach(var i;['vertical-adjust','fore-aft-adjust','cmd_selector_valve'])
     props.getNode("/controls/seat",1).addChild(i);
 props.getNode("/controls/seat",1).addChildren("eject",3);
-for(var i=0;i<3;i+=1){
+for(var i=0;i<3;i+=1) {
     props.getNode("/controls/seat/eject["~i~"]",1).addChild("initiate");
     props.getNode("/controls/seat/eject["~i~"]",1).addChild("status");
 }
@@ -536,17 +537,17 @@ props.getNode("/position/altitude-agl-ft",1).setValue('/',22.4704);
 props.getNode("/orientation/heading-deg",1).setValue('/',90);
 props.getNode("/controls/flight/rudder",1).setValue('/',0.114);
 
-func(){
+func() {
     srand();
     var tmp=nil;
     var vec=[props.globals];
-    while(size(vec)){
+    while(size(vec)) {
         tmp=[];
-        foreach(var i;vec){
-            if(typeof(i.val)=="hash"){
-                if(size(i.val)==0){
+        foreach(var i;vec) {
+            if (typeof(i.val)=="hash") {
+                if (size(i.val)==0) {
                     i.setDoubleValue(rand()*10);
-                }else{
+                } else {
                     foreach(var j;keys(i.val))
                         append(tmp,i.val[j]);
                 }
@@ -561,6 +562,6 @@ println("[\e[32m fg_env    \e[0m] [",os.time(),"] init done");
 println("-------------------------------------------------------------");
 
 foreach(var a;runtime.argv())
-    if(contains(fg_env_cli,a)){
+    if (contains(fg_env_cli,a)) {
         fg_env_cli[a].f();
     }
diff --git a/std/file.nas b/std/file.nas
index 4159561..c75be71 100644
--- a/std/file.nas
+++ b/std/file.nas
@@ -8,7 +8,7 @@ var SEEK_CUR = io.SEEK_CUR;
 var SEEK_END = io.SEEK_END;
 
 
-var new = func(filename, mode="r"){
+var new = func(filename, mode="r") {
     if (!io.exists(filename)) {
         return nil;
     }
@@ -29,17 +29,17 @@ var new = func(filename, mode="r"){
     };
 }
 
-var find_all_files_with_extension = func(path, extensions...){
+var find_all_files_with_extension = func(path, extensions...) {
     var in_vec = func(ext) {
         foreach(var i;extensions) {
-            if (ext==i){
+            if (ext==i) {
                 return 1;
             }
         }
         return 0;
     }
     var res = [];
-    foreach(var f;find_all_files(path)){
+    foreach(var f;find_all_files(path)) {
         var tmp = split('.', f);
         if (size(tmp)>1 and in_vec(tmp[-1])) {
             append(res, f);
@@ -48,16 +48,17 @@ var find_all_files_with_extension = func(path, extensions...){
     return res;
 }
 
-var find_all_files = func(path){
+var find_all_files = func(path) {
     if (!io.exists(path)) {
         return [];
     }
     var dd = unix.opendir(path);
     var res = [];
-    while(var n = unix.readdir(dd))
-        if(unix.isfile(path~"/"~n)) {
+    while(var n = unix.readdir(dd)) {
+        if (unix.isfile(path~"/"~n)) {
             append(res, n);
         }
+    }
     unix.closedir(dd);
     return res;
 }
diff --git a/std/json.nas b/std/json.nas
index 7cf97b9..8aab185 100644
--- a/std/json.nas
+++ b/std/json.nas
@@ -93,7 +93,7 @@ var parse = func() {
             }
             ptr += 1;
         }
-        if(ptr>=text_size) {
+        if (ptr>=text_size) {
             token.content = "eof";
             token.type = _j_eof;
             return;
@@ -167,7 +167,7 @@ var parse = func() {
     }
 
     var match = func(type) {
-        if(token.type!=type) {
+        if (token.type!=type) {
             println("json::parse: line ",line,": expect ",_j_content[type]," but get `",token.content,"`.");
             _parse_error += 1;
         }
@@ -237,7 +237,7 @@ var parse = func() {
 
     return func(source) {
         _parse_error = 0;
-        if(typeof(source)!="str") {
+        if (typeof(source)!="str") {
             println("json::parse: must use string but get", typeof(str));
             _parse_error += 1;
             return [];
@@ -260,7 +260,7 @@ var parse = func() {
 var stringify = func(object) {
     _parse_error = 0;
     var object_type = typeof(object);
-    if(object_type!="hash" and object_type!="vec" and object_type!="namespace") {
+    if (object_type!="hash" and object_type!="vec" and object_type!="namespace") {
         _parse_error += 1;
         println("json::stringify: must use hashmap or vector, but get ", typeof(object));
         return "[]";
diff --git a/std/lib.nas b/std/lib.nas
index ce2afef..09b4680 100644
--- a/std/lib.nas
+++ b/std/lib.nas
@@ -1,12 +1,9 @@
 # lib.nas
 # 2019 ValKmjolnir
-
-use std.coroutine;
 use std.math;
 use std.string;
 use std.io;
 use std.os;
-use std.bits;
 use std.unix;
 
 # print is used to print all things in nasal, try and see how it works.
@@ -235,7 +232,7 @@ var println = func(elems...) {
 var sort = func() {
     srand();  # be aware! this causes global changes
     var quick_sort_core = func(vec, left, right, cmp) {
-        if(left>=right) return nil;
+        if (left>=right) return nil;
         var base = left+int(rand()*(right-left));
         (vec[left], vec[base]) = (vec[base], vec[left]);
         var (i, j, tmp) = (left, right, vec[left]);
@@ -301,7 +298,7 @@ var ghosttype = func(ghost_object) {
 # get the index of val in the vec
 var vecindex = func(vec, val) {
     forindex(var i; vec) {
-        if(val==vec[i]) {
+        if (val==vec[i]) {
             return i;
         }
     }
@@ -313,11 +310,11 @@ var isa = func(object, class) {
     if (!ishash(object)) {
         return false;
     }
-    if(!contains(object, "parents") or !isvec(object.parents)) {
+    if (!contains(object, "parents") or !isvec(object.parents)) {
         return false;
     }
     foreach(var elem; object.parents) {
-        if(elem==class or isa(elem, class)) {
+        if (elem==class or isa(elem, class)) {
             return true;
         }
     }
diff --git a/std/list.nas b/std/list.nas
index 2b70bd7..3c1aca3 100644
--- a/std/list.nas
+++ b/std/list.nas
@@ -10,7 +10,7 @@ var new = func() {
                 prev: nil,
                 next: nil
             };
-            if(end!=nil) {
+            if (end!=nil) {
                 end.next = tmp;
                 tmp.prev = end;
                 end = tmp;
diff --git a/std/log.nas b/std/log.nas
index b89f164..ce22517 100644
--- a/std/log.nas
+++ b/std/log.nas
@@ -1,18 +1,18 @@
 # log.nas
 # ValKmjolnir 2022/6/14
-var log=func(){
+var log = func() {
     var (log_date,log_time,prefix)=(1,1,"");
     var os_time="";
-    var prt_core=func(elem){
+    var prt_core = func(elem) {
         os_time=os.time();
         print(prefix," ");
-        if(log_date and log_time)
+        if (log_date and log_time)
             print(os_time," ");
-        elsif(log_date or log_time){
+        elsif (log_date or log_time) {
             var s=split(" ",os_time);
-            if(log_date)
+            if (log_date)
                 print(s[0]," ");
-            if(log_time)
+            if (log_time)
                 print(s[1]," ");
         }
         foreach(var i;elem)
@@ -20,19 +20,19 @@ var log=func(){
         print("\n");
     }
     return {
-        setflags:func(date,time){
+        setflags:func(date,time) {
             log_date=!!date;
             log_time=!!time;
         },
-        setprefix:func(s){
-            if(typeof(s)!="str")
+        setprefix:func(s) {
+            if (typeof(s)!="str")
                 println("[log.nas] must use string as the prefix.");
             prefix=s;
         },
-        println:func(elem...){
+        println:func(elem...) {
             prt_core(elem);
         },
-        fatalln:func(elem...){
+        fatalln:func(elem...) {
             prt_core(elem);
             die("log:fatal error");
         }
diff --git a/std/mat.nas b/std/mat.nas
index 3c52e9a..42289c9 100644
--- a/std/mat.nas
+++ b/std/mat.nas
@@ -1,5 +1,5 @@
 
-var mat=func(width,height) {
+var mat = func(width,height) {
     var res=[];
     setsize(res,width*height);
     forindex(var i;res) {
@@ -12,14 +12,14 @@ var mat=func(width,height) {
     };
 }
 
-var rand_init=func(a) {
+var rand_init = func(a) {
     var ref=a.mat;
     forindex(var i;ref) {
         ref[i]=rand()*2-1;
     }
 }
 
-var mat_print=func(a) {
+var mat_print = func(a) {
     var (width,height,ref)=(a.width,a.height,a.mat);
     for(var i=0;i<height;i+=1) {
         for(var j=0;j<width;j+=1) {
@@ -29,8 +29,8 @@ var mat_print=func(a) {
     }
 }
 
-var add=func(a,b) {
-    if(a.width!=b.width or a.height!=b.height) {
+var add = func(a,b) {
+    if (a.width!=b.width or a.height!=b.height) {
         println("matrix a: ",a);
         println("matrix b: ",b);
         die("width and height must be the same");
@@ -49,8 +49,8 @@ var add=func(a,b) {
     return res;
 }
 
-var sub=func(a,b) {
-    if(a.width!=b.width or a.height!=b.height) {
+var sub = func(a,b) {
+    if (a.width!=b.width or a.height!=b.height) {
         println("matrix a: ",a);
         println("matrix b: ",b);
         die("width and height must be the same");
@@ -69,8 +69,8 @@ var sub=func(a,b) {
     return res;
 }
 
-var hardamard=func(a,b) {
-    if(a.width!=b.width or a.height!=b.height) {
+var hardamard = func(a,b) {
+    if (a.width!=b.width or a.height!=b.height) {
         println("matrix a: ",a);
         println("matrix b: ",b);
         die("width and height must be the same");
@@ -89,7 +89,7 @@ var hardamard=func(a,b) {
     return res;
 }
 
-var neg=func(a) {
+var neg = func(a) {
     var res=mat(a.width,a.height);
     var (aref,ref)=(a.mat,res.mat);
     forindex(var i;aref) {
@@ -98,7 +98,7 @@ var neg=func(a) {
     return res;
 }
 
-var sum=func(a) {
+var sum = func(a) {
     var res=0;
     var aref=a.mat;
     forindex(var i;aref) {
@@ -107,7 +107,7 @@ var sum=func(a) {
     return res;
 }
 
-var mult_num=func(a,c) {
+var mult_num = func(a,c) {
     var res=mat(a.width,a.height);
     var ref=res.mat;
     var aref=a.mat;
@@ -117,7 +117,7 @@ var mult_num=func(a,c) {
     return res;
 }
 
-var trans=func(a) {
+var trans = func(a) {
     var res=mat(a.height,a.width);
     var ref=res.mat;
     var (a_width,a_height,aref)=(a.width,a.height,a.mat);
@@ -129,7 +129,7 @@ var trans=func(a) {
     return res;
 }
 
-var activate=func(a,f) {
+var activate = func(a,f) {
     var res=mat(a.width,a.height);
     var (aref,ref)=(a.mat,res.mat);
     forindex(var i;aref) {
@@ -138,8 +138,8 @@ var activate=func(a,f) {
     return res;
 }
 
-var mult=func(a,b) {
-    if(a.width!=b.height) {
+var mult = func(a,b) {
+    if (a.width!=b.height) {
         println("matrix a: ",a);
         println("matrix b: ",b);
         die("a.width must equal to b.height, but get a.width:"~str(a.width)~" and b.height"~str(b.height));
@@ -161,28 +161,28 @@ var mult=func(a,b) {
     return res;
 }
 
-var sigmoid=func(x) {
+var sigmoid = func(x) {
     var t=math.exp(-x);
     return 1/(1+t);
 }
 
-var diffsigmoid=func(x) {
+var diffsigmoid = func(x) {
     x=sigmoid(x);
     return x*(1-x);
 }
 
-var tanh=func(x) {
+var tanh = func(x) {
     var t1=math.exp(x);
     var t2=math.exp(-x);
     return (t1-t2)/(t1+t2);
 }
 
-var difftanh=func(x) {
+var difftanh = func(x) {
     x=tanh(x);
     return 1-x*x;
 }
 
-var bp_example=func() {
+var bp_example = func() {
     srand();
     var lr=0.01;
     var input=[
@@ -221,7 +221,7 @@ var bp_example=func() {
     var total=1e6;
     while(total>0.001) {
         epoch+=1;
-        if(epoch>1e4) {
+        if (epoch>1e4) {
             println("Training failed after ",epoch," epoch.");
             break;
         }
@@ -248,7 +248,7 @@ var bp_example=func() {
             total+=sum(mult_num(mult(error,trans(error)),0.5));
         }
     }
-    if(epoch<=1e4) {
+    if (epoch<=1e4) {
         println("Training succeeded after ",epoch," epoch.");
     }
 
diff --git a/std/module.nas b/std/module.nas
index bdb2888..5c03059 100644
--- a/std/module.nas
+++ b/std/module.nas
@@ -4,35 +4,36 @@
 # this provides safe usage of dylib
 # when dylib is closed,
 # all the invalid functions cannot be called
+use std.dylib;
 
-var module_call_func=func(fptr,args){
+var module_call_func = func(fptr, args) {
     return __dlcallv;
 }
-var extern={
-    new: func(fptr){
-        var isopen=1;
+var extern = {
+    new: func(fptr) {
+        var isopen = 1;
         return {
-            close:func(){isopen=0;},
-            call:func(args...){
+            close: func() {isopen = 0;},
+            call: func(args...) {
                 return isopen?module_call_func(fptr,args):nil;
             }
         };
     }
 };
-var module={
-    new: func(name){
-        var lib=dylib.dlopen(name);
-        var f={};
+var module = {
+    new: func(name) {
+        var lib = dylib.dlopen(name);
+        var f = {};
         return {
-            get:func(symbol){
-                if(contains(f,symbol))
+            get: func(symbol) {
+                if (contains(f,symbol))
                     return f[symbol];
-                var fp=extern.new(dylib.dlsym(lib,symbol));
-                f[symbol]=fp;
+                var fp = extern.new(dylib.dlsym(lib,symbol));
+                f[symbol] = fp;
                 return fp;
             },
-            close: func(){
-                foreach(var i;keys(f))
+            close: func() {
+                foreach(var i; keys(f))
                     f[i].close();
                 dylib.dlclose(lib);
             }
diff --git a/std/process_bar.nas b/std/process_bar.nas
index ae05498..cac9f07 100644
--- a/std/process_bar.nas
+++ b/std/process_bar.nas
@@ -2,49 +2,49 @@
 # ValKmjolnir 2022/6/14
 # this file is inspired by a Python lib: alive_progress
 
-var bar=func(){
-    var bar={
-        solid_triangle_right:"▶",
-        hollow_triangle_right:"▷",
-        solid_triangle_left:"◀",
-        hollow_triangle_left:"◁",
-        solid_circle:"●",
-        hollow_circle:"○",
-        tick:"✔",
-        cross:"✘",
-        light_shadow:"░",
-        medium_shadow:"▒",
-        deep_shadow:"▓",
-        block:"█",
-        sharp:"#",
-        square:"√",
-        equal:"=",
-        space:" ",
-        point:".",
-        line:"━"
+var bar = func() {
+    var bar = {
+        solid_triangle_right: "▶",
+        hollow_triangle_right: "▷",
+        solid_triangle_left: "◀",
+        hollow_triangle_left: "◁",
+        solid_circle: "●",
+        hollow_circle: "○",
+        tick: "✔",
+        cross: "✘",
+        light_shadow: "░",
+        medium_shadow: "▒",
+        deep_shadow: "▓",
+        block: "█",
+        sharp: "#",
+        square: "√",
+        equal: "=",
+        space: " ",
+        point: ".",
+        line: "━"
     };
-    var separator={
-        angle_bracket:["<",">"],
-        line:["|","|"],
-        bracket:["[","]"],
-        space:[" "," "],
-        curve:["(",")"]
+    var separator = {
+        angle_bracket: ["<",">"],
+        line: ["|","|"],
+        bracket: ["[","]"],
+        space: [" "," "],
+        curve: ["(",")"]
     };
-    return func(front="sharp",back="space",sep="line",length=20){
-        if(typeof(front)!="str" or !contains(bar,front))
+    return func(front = "sharp", back = "space", sep = "line", length = 20) {
+        if (typeof(front)!="str" or !contains(bar,front))
             front="sharp";
-        if(typeof(back)!="str" or !contains(bar,back))
+        if (typeof(back)!="str" or !contains(bar,back))
             back="space";
-        if(typeof(sep)!="str" or !contains(separator,sep))
+        if (typeof(sep)!="str" or !contains(separator,sep))
             sep="line";
         front=bar[front];
         back=bar[back];
         sep=separator[sep];
         return {
-            bar:func(number){
-                if(number>1)
+            bar: func(number) {
+                if (number>1)
                     number=1;
-                if(number<0)
+                if (number<0)
                     number=0;
                 var finish_length=int(number*length);
                 var other=length-finish_length;
@@ -62,32 +62,32 @@ var bar=func(){
 # return a high resolution progress bar
 # example:
 # var bar=process_bar.high_resolution_bar(40);
-# for(var i=0;i<=1;i+=0.001){
+# for(var i=0;i<=1;i+=0.001) {
 #     print(bar.bar(i,40),'\r');
 #     unix.sleep(0.001);
 # }
 # println();
-var high_resolution_bar=func(){
+var high_resolution_bar = func() {
     var block=["▏","▎","▍","▌","▋","▊","▉","█"];
-    return func(length){
+    return func(length) {
         return {
-            bar: func(number){
-                if(number>1)
+            bar: func(number) {
+                if (number>1)
                     number=1;
-                if(number<0)
+                if (number<0)
                     number=0;
                 var block_len=number*length;
                 var complete_block=int(block_len);
                 var decimal=block_len-complete_block;
                 var progress=complete_block+(decimal!=0);
                 var s="|";
-                for(var i=0;i<complete_block;i+=1){
+                for(var i=0;i<complete_block;i+=1) {
                     s~="█";
                 }
-                if(decimal!=0){
+                if (decimal!=0) {
                     s~=block[int(decimal*10)/10*size(block)];
                 }
-                for(var i=0;i<length-progress;i+=1){
+                for(var i=0;i<length-progress;i+=1) {
                     s~=" ";
                 }
                 s~="|";
@@ -97,30 +97,30 @@ var high_resolution_bar=func(){
     };
 }();
 
-var spinner=func(){
-    var generate_scrolling_spinner=func(s){
-        if(typeof(s)!="str")
+var spinner = func() {
+    var generate_scrolling_spinner = func(s) {
+        if (typeof(s)!="str")
             s="****";
-        if(size(s)>16)
+        if (size(s)>16)
             s="****";
         var vec=split("",s);
         var res=[];
         var len=size(vec);
         var tmp="";
-        for(var i=0;i<len;i+=1){
+        for(var i=0;i<len;i+=1) {
             tmp=pop(vec)~tmp;
             append(res,tmp);
             while(size(res[-1])!=16)
                 res[-1]~=" ";
         }
         tmp=res[-1];
-        while(tmp!="                "){
+        while(tmp!="                ") {
             tmp=" "~substr(tmp,0,15);
             append(res,tmp);
         }
         return res;
     }
-    var spinner={
+    var spinner = {
         rise:["▁","▂","▃","▄","▅","▆","▇","█","█","▇","▆","▅","▄","▃","▂","▁"],
         vertical:["▏","▎","▍","▌","▋","▊","▉","▇","▇","▉","▊","▋","▌","▍","▎","▏"],
         dot:["⠁","⠈","⠐","⠠","⢀","⡀","⠄","⠂"],
@@ -217,18 +217,18 @@ var spinner=func(){
         wait:generate_scrolling_spinner("please wait"),
         stars:generate_scrolling_spinner("********")
     };
-    return func(type="classic",repeat=1){
-        if(typeof(type)!="str" or !contains(spinner,type))
+    return func(type = "classic", repeat = 1) {
+        if (typeof(type)!="str" or !contains(spinner,type))
             type="classic";
         type=spinner[type];
         var counter=0;
         return {
-            next:func(){
+            next: func() {
                 var s="";
                 for(var i=0;i<repeat;i+=1)
                     s~=type[counter];
                 counter+=1;
-                if(counter>=size(type))
+                if (counter>=size(type))
                     counter=0;
                 return s;
             }
@@ -236,71 +236,71 @@ var spinner=func(){
     };
 }();
 
-var default_bar=func(name="classic",length=20){
-    if(typeof(name)!="str")
+var default_bar = func(name = "classic", length = 20) {
+    if (typeof(name)!="str")
         name="classic";
-    if(name=="classic")
+    if (name=="classic")
         return process_bar.bar("sharp","point","bracket",length);
-    elsif(name=="classic2")
+    elsif (name=="classic2")
         return process_bar.bar("equal","point","bracket",length);
-    elsif(name=="classic3")
+    elsif (name=="classic3")
         return process_bar.bar("sharp","point","line",length);
-    elsif(name=="classic4")
+    elsif (name=="classic4")
         return process_bar.bar("equal","point","line",length);
-    elsif(name=="triangle")
+    elsif (name=="triangle")
         return process_bar.bar("solid_triangle_right","hollow_triangle_right","angle_bracket",length);
-    elsif(name=="dots")
+    elsif (name=="dots")
         return process_bar.bar("solid_circle","hollow_circle","curve",length);
-    elsif(name=="ticks")
+    elsif (name=="ticks")
         return process_bar.bar("tick","space","line",length);
-    elsif(name=="deep_shadow")
+    elsif (name=="deep_shadow")
         return process_bar.bar("deep_shadow","light_shadow","line",length);
-    elsif(name=="block")
+    elsif (name=="block")
         return process_bar.bar("block","light_shadow","line",length);
-    elsif(name=="oneline")
+    elsif (name=="oneline")
         return process_bar.bar("line","space","space",length);
     else
         return process_bar.bar("sharp","point","bracket",length);
 }
 
-var default_spinner=func(name="classic",repeat=1){
-    if(typeof(name)!="str")
+var default_spinner = func(name = "classic", repeat = 1) {
+    if (typeof(name)!="str")
         name="classic";
-    if(name=="rise")
+    if (name=="rise")
         return process_bar.spinner("rise",repeat);
-    elsif(name=="vertical")
+    elsif (name=="vertical")
         return process_bar.spinner("vertical",repeat);
-    elsif(name=="dot")
+    elsif (name=="dot")
         return process_bar.spinner("dot",repeat);
-    elsif(name=="dots")
+    elsif (name=="dots")
         return process_bar.spinner("dots",repeat);
-    elsif(name=="arrow")
+    elsif (name=="arrow")
         return process_bar.spinner("arrow",repeat);
-    elsif(name=="classic")
+    elsif (name=="classic")
         return process_bar.spinner("classic",repeat);
-    elsif(name=="balls")
+    elsif (name=="balls")
         return process_bar.spinner("balls",repeat);
-    elsif(name=="dots_wave")
+    elsif (name=="dots_wave")
         return process_bar.spinner("dots_wave",repeat);
-    elsif(name=="pulse")
+    elsif (name=="pulse")
         return process_bar.spinner("pulse",repeat);
-    elsif(name=="wave")
+    elsif (name=="wave")
         return process_bar.spinner("wave",repeat);
-    elsif(name=="short_wave")
+    elsif (name=="short_wave")
         return process_bar.spinner("short_wave",repeat);
-    elsif(name=="fish")
+    elsif (name=="fish")
         return process_bar.spinner("fish",repeat);
-    elsif(name=="happy")
+    elsif (name=="happy")
         return process_bar.spinner("happy",repeat);
-    elsif(name=="wait")
+    elsif (name=="wait")
         return process_bar.spinner("wait",repeat);
-    elsif(name=="stars")
+    elsif (name=="stars")
         return process_bar.spinner("stars",repeat);
     else
         return process_bar.spinner("classic",repeat);
 }
 
-var show=func(){
+var show = func() {
     print("\ec");
     var bars={
         "classic    ":process_bar.default_bar("classic",40),
@@ -333,12 +333,12 @@ var show=func(){
     };
     var bar_key=keys(bars);
     var spin_key=keys(spinners);
-    for(var i=0;i<40;i+=1){
-        forindex(var j;bar_key){
+    for(var i=0; i<40; i+=1) {
+        forindex(var j; bar_key) {
             var k=bar_key[j];
             print("\e["~(j+1)~";1H["~k~"] "~bars[k].bar((i+1)/40));
         }
-        forindex(var j;spin_key){
+        forindex(var j; spin_key) {
             var k=spin_key[j];
             print("\e["~(j+1+size(bars))~";1H["~k~"] |"~spinners[k].next()~"|");
         }
diff --git a/std/props.nas b/std/props.nas
index 5719e37..ffb693f 100644
--- a/std/props.nas
+++ b/std/props.nas
@@ -195,15 +195,15 @@ var Node = {
 
     getPath : func {
         var (name, index, parent) = (me.getName(), me.getIndex(), me.getParent());
-        if(index != 0)    { name ~= "[" ~ index ~ "]"; }
-        if(parent != nil) { name = parent.getPath() ~ "/" ~ name; }
+        if (index != 0)    { name ~= "[" ~ index ~ "]"; }
+        if (parent != nil) { name = parent.getPath() ~ "/" ~ name; }
         return name;
     },
 
     getBoolValue : func {
         var val = me.getValue();
         var mytype = me.getType();
-        if((mytype == "STRING" or mytype == "UNSPECIFIED") and val == "false") return 0;
+        if ((mytype == "STRING" or mytype == "UNSPECIFIED") and val == "false") return 0;
         return !!val;
     },
 
@@ -216,7 +216,7 @@ var Node = {
     },
 
     remove : func {
-        if((var p = me.getParent()) == nil) return nil;
+        if ((var p = me.getParent()) == nil) return nil;
         p.removeChild(me.getName(), me.getIndex());
     },
 
@@ -300,7 +300,7 @@ var Node = {
 #
 Node.new = func(values = nil) {
     var result = wrapNode(_new());
-    if(ishash(values)) {
+    if (ishash(values)) {
         result.setValues(values);
     }
     return result;
@@ -316,18 +316,18 @@ Node.new = func(values = nil) {
 #
 Node.getValues = func {
     var children = me.getChildren();
-    if(!size(children)) return me.getValue();
+    if (!size(children)) return me.getValue();
     var val = {};
     var numchld = {};
     foreach(var c; children) {
         var name = c.getName();
-        if(contains(numchld, name)) { var nc = numchld[name]; }
+        if (contains(numchld, name)) { var nc = numchld[name]; }
         else {
             var nc = size(me.getChildren(name));
             numchld[name] = nc;
-            if(nc > 1 and !contains(val, name)) val[name] = [];
+            if (nc > 1 and !contains(val, name)) val[name] = [];
         }
-        if(nc > 1) append(val[name], c.getValues());
+        if (nc > 1) append(val[name], c.getValues());
         else val[name] = c.getValues();
     }
     return val;
@@ -346,13 +346,13 @@ Node.getValues = func {
 #
 Node.initNode = func(path = nil, value = 0, type = nil, force = 0) {
     var prop = me.getNode(path or "", 1);
-    if(prop.getType() != "NONE") value = prop.getValue();
-    if(force) prop.clearValue();
-    if(type == nil) prop.setValue(value);
-    elsif(type == "DOUBLE") prop.setDoubleValue(value);
-    elsif(type == "INT") prop.setIntValue(value);
-    elsif(type == "BOOL") prop.setBoolValue(value);
-    elsif(type == "STRING") prop.setValue("" ~ value);
+    if (prop.getType() != "NONE") value = prop.getValue();
+    if (force) prop.clearValue();
+    if (type == nil) prop.setValue(value);
+    elsif (type == "DOUBLE") prop.setDoubleValue(value);
+    elsif (type == "INT") prop.setIntValue(value);
+    elsif (type == "BOOL") prop.setBoolValue(value);
+    elsif (type == "STRING") prop.setValue("" ~ value);
     else die("initNode(): unsupported type '" ~ type ~ "'");
     return prop;
 }
@@ -363,7 +363,7 @@ Node.initNode = func(path = nil, value = 0, type = nil, force = 0) {
 # to a key for a fun hack.
 #
 var dump = func {
-    if(size(arg) == 1) { var prefix = "";     var node = arg[0]; }
+    if (size(arg) == 1) { var prefix = "";     var node = arg[0]; }
     else               { var prefix = arg[0]; var node = arg[1]; }
 
     var index = node.getIndex();
@@ -371,13 +371,13 @@ var dump = func {
     var name = node.getName();
     var val = node.getValue();
 
-    if(val == nil) { val = "nil"; }
+    if (val == nil) { val = "nil"; }
     name = prefix ~ name;
-    if(index > 0) { name = name ~ "[" ~ index ~ "]"; }
+    if (index > 0) { name = name ~ "[" ~ index ~ "]"; }
     print(name, " {", type, "} = ", val);
 
     # Don't recurse into aliases, lest we get stuck in a loop
-    if(type != "ALIAS") {
+    if (type != "ALIAS") {
         var children = node.getChildren();
         foreach(var c; children) { dump(name ~ "/", c); }
     }
@@ -413,12 +413,12 @@ var copy = func(src, dest, attr = 0) {
     }
     var type = src.getType();
     var val = src.getValue();
-    if(type == "ALIAS" or type == "NONE") return;
-    elsif(type == "BOOL") dest.setBoolValue(val);
-    elsif(type == "INT" or type == "LONG") dest.setIntValue(val);
-    elsif(type == "FLOAT" or type == "DOUBLE") dest.setDoubleValue(val);
+    if (type == "ALIAS" or type == "NONE") return;
+    elsif (type == "BOOL") dest.setBoolValue(val);
+    elsif (type == "INT" or type == "LONG") dest.setIntValue(val);
+    elsif (type == "FLOAT" or type == "DOUBLE") dest.setDoubleValue(val);
     else dest.setValue(val);
-    if(attr) dest.setAttribute(src.getAttribute());
+    if (attr) dest.setAttribute(src.getAttribute());
 }
 
 ##
@@ -426,9 +426,9 @@ var copy = func(src, dest, attr = 0) {
 # array) into Node objects.
 #
 var wrap = func(node) {
-    if(isghost(node)) {
+    if (isghost(node)) {
         return wrapNode(node);
-    } elsif(isvec(node)) {
+    } elsif (isvec(node)) {
         var v = node;
         var n = size(v);
         for(var i=0; i<n; i+=1) { v[i] = wrapNode(v[i]); }
@@ -468,13 +468,13 @@ var getNode = func return call(props.globals.getNode, arg, props.globals);
 #
 var setAll = func(base, child, value) {
     var node = props.globals.getNode(base);
-    if(node == nil) return;
+    if (node == nil) return;
     var name = node.getName();
     node = node.getParent();
-    if(node == nil) return;
+    if (node == nil) return;
     var children = node.getChildren();
     foreach(var c; children)
-        if(c.getName() == name)
+        if (c.getName() == name)
             c.getNode(child, 1).setValue(value);
 }
 
@@ -513,19 +513,19 @@ var createNodeObjectsFromHash = func (property_list, namespace = nil) {
 var nodeList = func {
     var list = [];
     foreach(var a; arg) {
-        if(isa(a, Node))
+        if (isa(a, Node))
             append(list, a);
-        elsif(isscalar(a))
+        elsif (isscalar(a))
             append(list, props.globals.getNode(a, 1));
-        elsif(isvec(a))
+        elsif (isvec(a))
             foreach(var i; a)
                 list ~= nodeList(i);
-        elsif(ishash(a))
+        elsif (ishash(a))
             foreach(var i; keys(a))
                 list ~= nodeList(a[i]);
-        elsif(isfunc(a))
+        elsif (isfunc(a))
             list ~= nodeList(a());
-        elsif(isghost(a) and ghosttype(a) == "prop")
+        elsif (isghost(a) and ghosttype(a) == "prop")
             append(list, wrapNode(a));
         else
             die("nodeList: invalid nil property");
@@ -541,8 +541,8 @@ var nodeList = func {
 # The function returns nil on error.
 #
 var compileCondition = func(p) {
-    if(p == nil) return nil;
-    if(!isa(p, Node)) p = props.globals.getNode(p);
+    if (p == nil) return nil;
+    if (!isa(p, Node)) p = props.globals.getNode(p);
     return _createCondition(p._g);
 }
 
@@ -553,35 +553,35 @@ var compileCondition = func(p) {
 # branch and returns nil on error.
 #
 var condition = func(p) {
-    if(p == nil) return 1;
-    if(!isa(p, Node)) p = props.globals.getNode(p);
+    if (p == nil) return 1;
+    if (!isa(p, Node)) p = props.globals.getNode(p);
     return _cond_and(p)
 }
 
 var _cond_and = func(p) {
     foreach(var c; p.getChildren())
-        if(!_cond(c)) return 0;
+        if (!_cond(c)) return 0;
     return 1;
 }
 
 var _cond_or = func(p) {
     foreach(var c; p.getChildren())
-        if(_cond(c)) return 1;
+        if (_cond(c)) return 1;
     return 0;
 }
 
 var _cond = func(p) {
     var n = p.getName();
-    if(n == "or") return _cond_or(p);
-    if(n == "and") return _cond_and(p);
-    if(n == "not") return !_cond_and(p);
-    if(n == "equals") return _cond_cmp(p, 0);
-    if(n == "not-equals") return !_cond_cmp(p, 0);
-    if(n == "less-than") return _cond_cmp(p, -1);
-    if(n == "greater-than") return _cond_cmp(p, 1);
-    if(n == "less-than-equals") return !_cond_cmp(p, 1);
-    if(n == "greater-than-equals") return !_cond_cmp(p, -1);
-    if(n == "property") return !!getprop(p.getValue());
+    if (n == "or") return _cond_or(p);
+    if (n == "and") return _cond_and(p);
+    if (n == "not") return !_cond_and(p);
+    if (n == "equals") return _cond_cmp(p, 0);
+    if (n == "not-equals") return !_cond_cmp(p, 0);
+    if (n == "less-than") return _cond_cmp(p, -1);
+    if (n == "greater-than") return _cond_cmp(p, 1);
+    if (n == "less-than-equals") return !_cond_cmp(p, 1);
+    if (n == "greater-than-equals") return !_cond_cmp(p, -1);
+    if (n == "property") return !!getprop(p.getValue());
     logprint(LOG_ALERT, "condition: invalid operator ", n);
     dump(p);
     return nil;
@@ -589,17 +589,17 @@ var _cond = func(p) {
 
 var _cond_cmp = func(p, op) {
     var left = p.getChild("property", 0, 0);
-    if(left != nil) { left = getprop(left.getValue()); }
+    if (left != nil) { left = getprop(left.getValue()); }
     else {
         logprint(LOG_ALERT, "condition: no left value");
         dump(p);
         return nil;
     }
     var right = p.getChild("property", 1, 0);
-    if(right != nil) { right = getprop(right.getValue()); }
+    if (right != nil) { right = getprop(right.getValue()); }
     else {
         right = p.getChild("value", 0, 0);
-        if(right != nil) { right = right.getValue(); }
+        if (right != nil) { right = right.getValue(); }
         else {
             logprint(LOG_ALERT, "condition: no right value");
             dump(p);
@@ -610,8 +610,8 @@ var _cond_cmp = func(p, op) {
     if (left == nil) left = 0.0;
     if (right == nil) right = 0.0;
 
-    if(op < 0) return left < right;
-    if(op > 0) return left > right;
+    if (op < 0) return left < right;
+    if (op > 0) return left > right;
     return left == right;
 }
 
@@ -622,7 +622,7 @@ var _cond_cmp = func(p, op) {
 # in the binding.
 #
 var runBinding = func(node, module = nil) {
-    if(module != nil and node.getNode("module") == nil)
+    if (module != nil and node.getNode("module") == nil)
         node.getNode("module", 1).setValue(module);
     var cmd = node.getNode("command", 1).getValue() or "null";
     condition(node.getNode("condition")) ? fgcommand(cmd, node) : 0;
@@ -702,13 +702,13 @@ var UpdateManager =
                 me.localType = me.property.getType();
                 if (me.localType == "INT" or me.localType == "LONG" or me.localType == "FLOAT" or me.localType == "DOUBLE")
                   {
-                      if(me.lastval == nil or math.abs(me.lastval - me.curval) >= me.delta)
+                      if (me.lastval == nil or math.abs(me.lastval - me.curval) >= me.delta)
                         {
                             me.lastval = me.curval;
                             me.changed(me.curval);
                         }
                   }
-                else if(me.lastval == nil or me.lastval != me.curval)
+                else if (me.lastval == nil or me.lastval != me.curval)
                   {
                       me.lastval = me.curval;
                       me.changed(me.curval);
diff --git a/std/queue.nas b/std/queue.nas
index 1c98f84..d662e77 100644
--- a/std/queue.nas
+++ b/std/queue.nas
@@ -1,34 +1,34 @@
 # queue.nas
 # valkmjolnir 2021/3/31
-var new=func(){
-    var (begin,end)=(nil,nil);
+var new = func() {
+    var (begin, end) = (nil, nil);
     return{
-        push:func(elem){
+        push: func(elem) {
             var new_node={
                 elem:elem,
                 next:nil
             };
-            if(begin==nil)
+            if (begin==nil)
                 begin=end=new_node;
-            else{
+            else {
                 end.next=new_node;
                 end=new_node;
             }
         },
-        pop:func(){
-            if(begin!=nil)
+        pop: func() {
+            if (begin!=nil)
                 begin=begin.next;
-            if(begin==nil)
+            if (begin==nil)
                 end=nil;
         },
-        front:func(){
-            if(begin!=nil)
+        front: func() {
+            if (begin!=nil)
                 return begin.elem;
         },
-        clear:func(){
+        clear: func() {
             begin=end=nil;
         },
-        empty:func(){
+        empty: func() {
             return begin==nil;
         }
     };
diff --git a/std/string.nas b/std/string.nas
index 81da2fa..bed819f 100644
--- a/std/string.nas
+++ b/std/string.nas
@@ -1,7 +1,7 @@
 # string.nas
 # ValKmjolnir 2022/10/5
 
-var join = func(sep, vec){
+var join = func(sep, vec) {
     var len = size(vec);
     var res = "";
     for(var i = 0; i<len; i += 1) {
diff --git a/std/udp.nas b/std/udp.nas
index 7918a3a..6f6210b 100644
--- a/std/udp.nas
+++ b/std/udp.nas
@@ -3,7 +3,7 @@ use module.libsock;
 var udp_server = func(hostname, port, retry_delay = 5) {
     var socket = libsock.socket;
     var server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM);
-    while(socket.bind(server, hostname, port) < 0){
+    while(socket.bind(server, hostname, port) < 0) {
         println("[", os.time(), "] failed to bind socket "~server~" at ", hostname, ":", port, ".");
         unix.sleep(retry_delay);
         println("[", os.time(), "] retrying...");
@@ -27,7 +27,7 @@ var udp_client = func(hostname = "", port = -1, retry_delay = 5) {
     var socket = libsock.socket;
     var client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM);
     if (port > 0 and size(hostname) != 0) {
-        while(socket.bind(client, hostname, port)<0){
+        while(socket.bind(client, hostname, port)<0) {
             println("[",os.time(),"] failed to bind socket "~client~" at ", hostname, ":", port, ".");
             unix.sleep(retry_delay);
             println("[",os.time(),"] retrying...");
diff --git a/std/unix.nas b/std/unix.nas
index 9639400..88f0282 100644
--- a/std/unix.nas
+++ b/std/unix.nas
@@ -1,5 +1,6 @@
 # unix.nas
 # 2023 by ValKmjolnir
+use std.bits;
 
 var _S_IFDIR = 0x4000;
 var _S_IFREG = 0x8000;
diff --git a/test/ascii-art.nas b/test/ascii-art.nas
index 2f04b89..95c53ea 100644
--- a/test/ascii-art.nas
+++ b/test/ascii-art.nas
@@ -31,14 +31,14 @@ var char_ttf=[
     ["███████╗","╚══███╔╝","  ███╔╝ "," ███╔╝  ","███████╗","╚══════╝"],
 ];
 
-var trans_ttf=func(string){
+var trans_ttf = func(string) {
     var str=["","","","","",""];
-    for(var i=0;i<size(string);i+=1){
+    for(var i=0;i<size(string);i+=1) {
         var number=string[i];
-        if(97<=number and number<=122)
+        if (97<=number and number<=122)
             for(var j=0;j<6;j+=1)
                 str[j]~=char_ttf[number-96][j];
-        elsif(65<=number and number<=90)
+        elsif (65<=number and number<=90)
             for(var j=0;j<6;j+=1)
                 str[j]~=char_ttf[number-64][j];
         else
@@ -50,11 +50,11 @@ var trans_ttf=func(string){
     return;
 }
 
-var curve1=func(line=4){
+var curve1 = func(line=4) {
     var table=["╚","═","╝","╔","║","╗"];
     rand(100);
     var s="";
-    for(var i=0;i<line;i+=1){
+    for(var i=0;i<line;i+=1) {
         for(var j=0;j<90;j+=1)
             s~=table[int(6*rand())];
         s~='\n';
@@ -62,11 +62,11 @@ var curve1=func(line=4){
     print(s);
 }
 
-var curve2=func(line=2){
+var curve2 = func(line=2) {
     var shadow=["░","▒","▓","█","▀","▄","▐","▌"];
     rand(100);
     var s="";
-    for(var i=0;i<line;i+=1){
+    for(var i=0;i<line;i+=1) {
         for(var j=0;j<90;j+=1)
             s~=shadow[int(8*rand())];
         s~='\n';
@@ -74,7 +74,7 @@ var curve2=func(line=2){
     print(s);
 }
 
-var curve3=func(line=2){
+var curve3 = func(line=2) {
     var arr=[
         0,1,2,3,4,5,6,7,8,
         0,1,2,3,4,5,6,7,8,
@@ -87,8 +87,8 @@ var curve3=func(line=2){
         0,1,2,3,4,5,6,7,8,
         0,1,2,3,4,5,6,7,8
     ];
-    for(var loop=0;loop<line;loop+=1){
-        for(var i=size(arr)-1;i>=0;i-=1){
+    for(var loop=0;loop<line;loop+=1) {
+        for(var i=size(arr)-1;i>=0;i-=1) {
             var rand_index=int(i*rand());
             (arr[i],arr[rand_index])=(arr[rand_index],arr[i]);
         }
@@ -102,7 +102,7 @@ var curve3=func(line=2){
     return;
 }
 
-var curve4=func(line=4){
+var curve4 = func(line=4) {
     var shadow=["m░\e[0m","m▒\e[0m","m▓\e[0m","m█\e[0m","m▀\e[0m","m▄\e[0m","m▐\e[0m","m▌\e[0m"];
     var front=[
         "30","31","32","33","34","35","36","37",
@@ -113,16 +113,16 @@ var curve4=func(line=4){
         "100","101","102","103","104","105","106","107"
     ];
     rand(time(0));
-    for(var i=0;i<line;i+=1){
+    for(var i=0;i<line;i+=1) {
         for(var j=0;j<90;j+=1)
             print("\e["~front[16*rand()]~";"~back[16*rand()]~shadow[8*rand()]);
         print('\n');
     }
 }
 
-var curve5=func(line=4){
+var curve5 = func(line=4) {
     var vec=["▀▄─","▄▀─","▀─▄","▄─▀"];
-    for(var (y,p)=(0,0);y!=line;y+=1){
+    for(var (y,p)=(0,0);y!=line;y+=1) {
         for(var x=0;x!=30;x+=1)
             print(vec[p]);
         print("\n");
@@ -131,7 +131,7 @@ var curve5=func(line=4){
     }
 }
 
-var ansi_escape_sequence=func(){
+var ansi_escape_sequence = func() {
     # decoration
     for(var i=0;i<10;i+=1)
         print("\e["~i~"m",padding.rightpad(i,4),"\e[0m");
@@ -194,7 +194,7 @@ var ansi_escape_sequence=func(){
 }
 
 # enable unicode
-if(os.platform()=="windows"){
+if (os.platform()=="windows") {
     system("chcp 65001");
 }
 
diff --git a/test/auto_crash.nas b/test/auto_crash.nas
index 3700395..a18c4af 100644
--- a/test/auto_crash.nas
+++ b/test/auto_crash.nas
@@ -10,30 +10,30 @@ var dt=0.01;
 var intergral=0;
 var derivative=0;
 var previous_error=0;
-var position_change = func(position_val,value){
-    if(position_val+value>180)
+var position_change = func(position_val,value) {
+    if (position_val+value>180)
         position_val += value-360;
-    else if(position_val+value<-180)
+    else if (position_val+value<-180)
         position_val += value+360;
     else
         position_val += value;
     return position_val;
 }
-var road_check_func = func(){
+var road_check_func = func() {
 
     var lat = props.getNode("/position/latitude-deg",1).getValue();
     var lon = props.getNode("/position/longitude-deg",1).getValue();
     var position_info = geodinfo(lat,lon);
     var position_names = position_info[1].names;
 
-    if((position_names[0]=="Freeway") or (position_names[0]=="Road")){
+    if ((position_names[0]=="Freeway") or (position_names[0]=="Road")) {
         var car_heading = 0;
         var lat_change  = 0;
         var lon_change  = 0;
         var left_range  = 0;
         var right_range = 0;
 
-        for(var i=0;i>-0.00005;i-=0.000001){
+        for(var i=0;i>-0.00005;i-=0.000001) {
             car_heading = props.getNode("/orientation/heading-deg",1).getValue();
             lat_change  = math.sin(D2R*car_heading);
             lon_change  = -math.cos(D2R*car_heading);
@@ -41,12 +41,12 @@ var road_check_func = func(){
             lon = props.getNode("/position/longitude-deg",1).getValue()+0.0001*math.sin(D2R*car_heading);
             var other_position_info = geodinfo(position_change(lat,i*lat_change),position_change(lon,i*lon_change));
             var other_names = other_position_info[1].names;
-            if((other_names[0]=="Freeway") or (other_names[0]=="Road"))
+            if ((other_names[0]=="Freeway") or (other_names[0]=="Road"))
                 right_range += 1;
             else
                 break;
         }
-        for(var i=0;i<0.00005;i+=0.000001){
+        for(var i=0;i<0.00005;i+=0.000001) {
             car_heading = props.getNode("/orientation/heading-deg",1).getValue();
             lat_change  = math.sin(D2R*car_heading);
             lon_change  = -math.cos(D2R*car_heading);
@@ -54,7 +54,7 @@ var road_check_func = func(){
             lon = props.getNode("/position/longitude-deg",1).getValue()+0.0001*math.sin(D2R*car_heading);
             var other_position_info = geodinfo(position_change(lat,i*lat_change),position_change(lon,i*lon_change));
             var other_names = other_position_info[1].names;
-            if((other_names[0]=="Freeway") or (other_names[0]=="Road"))
+            if ((other_names[0]=="Freeway") or (other_names[0]=="Road"))
                 left_range+=1;
             else
                 break;
@@ -64,9 +64,9 @@ var road_check_func = func(){
         derivative=(error-previous_error)/dt;
         var (Kp,Ki,Kd)=(1/900,0.05,0.005);
         # print("change p ",Kp*error*error,' i ',Ki*intergral,' d ',Kd*derivative);
-        if(error<0)
+        if (error<0)
             props.getNode("/", 1).setValue("/controls/flight/rudder",-Kp*error*error+Ki*intergral+Kd*derivative);
-        else if(error>0)
+        else if (error>0)
             props.getNode("/", 1).setValue("/controls/flight/rudder",Kp*error*error+Ki*intergral+Kd*derivative);
         else
             props.getNode("/", 1).setValue("/controls/flight/rudder",0);
@@ -81,12 +81,12 @@ var road_check_func = func(){
 };
 
 var road_check_timer = maketimer(0.01,road_check_func);
-var toggle_auto_pilot = func(){
-    if(!road_check_timer.isRunning){
+var toggle_auto_pilot = func() {
+    if (!road_check_timer.isRunning) {
         intergral=0;
         road_check_timer.start();
         props.getNode("/sim/messages/copilot",1).setValue('/',"ze dong sheng teaan see tong yee tse yung. Auto Sheng Teaan System Activated!");
-    }else{
+    } else {
         road_check_timer.stop();
         props.getNode("/sim/messages/copilot",1).setValue('/',"ze dong sheng teaan see tong yee guan bee. Auto Sheng Teaan System is off.");
     }
diff --git a/test/bf.nas b/test/bf.nas
index 1afe0b8..546446c 100644
--- a/test/bf.nas
+++ b/test/bf.nas
@@ -147,7 +147,7 @@ var mandelbrot=
 
 var (ptr,pc,paper,inum)=(0,0,[],[]);
 
-var character=func() {
+var character = func() {
     var res=[];
     setsize(res,256);
     forindex(var i;res) {
@@ -159,55 +159,55 @@ var character=func() {
 var (add,mov,jt,jf,in,out)=(
     func {paper[ptr]+=inum[pc];},
     func {ptr+=inum[pc];},
-    func {if(paper[ptr])pc=inum[pc];},
-    func {if(!paper[ptr])pc=inum[pc];},
+    func {if (paper[ptr])pc=inum[pc];},
+    func {if (!paper[ptr])pc=inum[pc];},
     func {paper[ptr]=input()[0];},
     func {print(character[paper[ptr]]);}
 );
 
-var codegen=func(program) {
+var codegen = func(program) {
     var (code,stack)=([],[]);
     var len=size(program);
     for(var i=0;i<len;i+=1) {
         var c=chr(program[i]);
-        if(c=='+' or c=='-') {
+        if (c=='+' or c=='-') {
             append(code,add);
             append(inum,0);
             for(;i<len;i+=1) {
-                if(chr(program[i])=='+') {
+                if (chr(program[i])=='+') {
                     inum[-1]+=1;
-                } elsif(chr(program[i])=='-') {
+                } elsif (chr(program[i])=='-') {
                     inum[-1]-=1;
-                } elsif(chr(program[i])!='\n') {
+                } elsif (chr(program[i])!='\n') {
                     i-=1;
                     break;
                 }
             }
-        } elsif(c=='<' or c=='>') {
+        } elsif (c=='<' or c=='>') {
             append(code,mov);
             append(inum,0);
-            for(;i<len;i+=1){
-                if(chr(program[i])=='>') {
+            for(;i<len;i+=1) {
+                if (chr(program[i])=='>') {
                     inum[-1]+=1;
-                } elsif(chr(program[i])=='<') {
+                } elsif (chr(program[i])=='<') {
                     inum[-1]-=1;
-                } elsif(chr(program[i])!='\n') {
+                } elsif (chr(program[i])!='\n') {
                     i-=1;
                     break;
                 }
             }
-        } elsif(c==',') {
+        } elsif (c==',') {
             append(code,in);
             append(inum,0);
-        } elsif(c=='.') {
+        } elsif (c=='.') {
             append(code,out);
             append(inum,0);
-        } elsif(c=='[') {
+        } elsif (c=='[') {
             append(code,jf);
             append(inum,0);
             append(stack,size(code)-1);
-        } elsif(c==']') {
-            if(!size(stack)) {
+        } elsif (c==']') {
+            if (!size(stack)) {
                 die("lack [");
             }
             var label=pop(stack);
@@ -217,7 +217,7 @@ var codegen=func(program) {
         }
     }
 
-    if(size(stack)) {
+    if (size(stack)) {
         die("lack "~size(stack)~" \"]\"");
         return;
     }
@@ -225,9 +225,9 @@ var codegen=func(program) {
     return code;
 }
 
-var bf=func(program) {
+var bf = func(program) {
     # enable ANSI escape sequence
-    if(os.platform()=="windows") {
+    if (os.platform()=="windows") {
         system("color");
     }
 
diff --git a/test/bfconvertor.nas b/test/bfconvertor.nas
index 55907c9..074c844 100644
--- a/test/bfconvertor.nas
+++ b/test/bfconvertor.nas
@@ -145,7 +145,7 @@ var mandelbrot=
 +[-[->>>>>>>>>+<<<<<<<<<]>>>>>>>>>]>>>>>->>>>>>>>>>>>>>>>>>>>>>>>>>>-<<<<<<[<<<<
 <<<<<]]>>>]";
 
-var padding=func(len) {
+var padding = func(len) {
     var res="";
     for(var i=0;i<len;i+=1) {
         res~="  ";
@@ -153,64 +153,64 @@ var padding=func(len) {
     return res;
 }
 
-var bf=func(program) {
+var bf = func(program) {
     var stack=[];
     var len=size(program);
     var f="#automatically generated by bfconvertor.nas\nvar ptr=0;\nvar paper=[];\nsetsize(paper,131072);\n";
     for(var i=0;i<len;i+=1) {
         var c=chr(program[i]);
-        if(c=='+' or c=='-') {
+        if (c=='+' or c=='-') {
             var cnt=0;
             for(;i<len;i+=1) {
-                if(chr(program[i])=='+') {
+                if (chr(program[i])=='+') {
                     cnt+=1;
-                } elsif(chr(program[i])=='-') {
+                } elsif (chr(program[i])=='-') {
                     cnt-=1;
-                } elsif(chr(program[i])!='\n') {
+                } elsif (chr(program[i])!='\n') {
                     i-=1;
                     break;
                 }
             }
-            if(cnt!=0) {
+            if (cnt!=0) {
                 f~=padding(size(stack));
             }
-            if(cnt>0) {
+            if (cnt>0) {
                 f~="paper[ptr]+="~cnt~";\n";
-            } elsif(cnt<0) {
+            } elsif (cnt<0) {
                 f~="paper[ptr]-="~(-cnt)~";\n";
             }
-        } elsif(c=='<' or c=='>') {
+        } elsif (c=='<' or c=='>') {
             var cnt=0;
             for(;i<len;i+=1) {
-                if(chr(program[i])=='>') {
+                if (chr(program[i])=='>') {
                     cnt+=1;
-                } elsif(chr(program[i])=='<') {
+                } elsif (chr(program[i])=='<') {
                     cnt-=1;
-                } elsif(chr(program[i])!='\n') {
+                } elsif (chr(program[i])!='\n') {
                     i-=1;
                     break;
                 }
             }
-            if(cnt!=0) {
+            if (cnt!=0) {
                 f~=padding(size(stack));
             }
-            if(cnt>0) {
+            if (cnt>0) {
                 f~="ptr+="~cnt~";\n";
-            } elsif(cnt<0) {
+            } elsif (cnt<0) {
                 f~="ptr-="~(-cnt)~";\n";
             }
-        } elsif(c==',') {
+        } elsif (c==',') {
             f~=padding(size(stack));
             f~="paper[ptr]=input()[0];\n";
-        } elsif(c=='.') {
+        } elsif (c=='.') {
             f~=padding(size(stack));
             f~="print(chr(paper[ptr]));\n";
-        } elsif(c=='[') {
+        } elsif (c=='[') {
             f~=padding(size(stack));
             f~="while(paper[ptr]) {\n";
             append(stack,0);
-        } elsif(c==']') {
-            if(!size(stack)) {
+        } elsif (c==']') {
+            if (!size(stack)) {
                 println("lack [");
                 return;
             }
@@ -219,7 +219,7 @@ var bf=func(program) {
             f~="}\n";
         }
     }
-    if(size(stack)) {
+    if (size(stack)) {
         println("lack ]");
         return;
     }
diff --git a/test/bfs.nas b/test/bfs.nas
index 1520e7a..3775981 100644
--- a/test/bfs.nas
+++ b/test/bfs.nas
@@ -3,15 +3,15 @@ use std.queue;
 rand(time(0));
 var pixel=[' ','#','.','*'];
 var map=[];
-for(var i=0;i<10;i+=1){
+for(var i=0;i<10;i+=1) {
     append(map,[]);
     for(var j=0;j<20;j+=1)
         append(map[i],(rand()>0.7));
 }
 
-var prt=func(){
+var prt = func() {
     var s="\e[0;0H+--------------------+\n";
-    for(var i=0;i<10;i+=1){
+    for(var i=0;i<10;i+=1) {
         s~="|";
         for(var j=0;j<20;j+=1)
             s~=pixel[map[i][j]];
@@ -22,27 +22,27 @@ var prt=func(){
     unix.sleep(1/800);
 }
 
-var bfs=func(begin,end){
+var bfs = func(begin,end) {
     var move=[[1,0],[0,1],[-1,0],[0,-1]];
     var que=queue.new();
     que.push(begin);
     map[begin[0]][begin[1]]=2;
     map[end[0]][end[1]]=0;
-    if(map[1][0]==1 and map[0][1]==1)
+    if (map[1][0]==1 and map[0][1]==1)
         map[1][0]=0;
-    while(!que.empty()){
+    while(!que.empty()) {
         var vertex=que.front();
         que.pop();
-        foreach(var i;move){
+        foreach(var i;move) {
             var x=vertex[0]+i[0];
             var y=vertex[1]+i[1];
-            if(x==end[0] and y==end[1]){
+            if (x==end[0] and y==end[1]) {
                 map[x][y]=3;
                 prt();
                 print("reached.\n");
                 return;
             }
-            if(0<=x and x<10 and 0<=y and y<20 and map[x][y]==0){
+            if (0<=x and x<10 and 0<=y and y<20 and map[x][y]==0) {
                 que.push([x,y]);
                 map[x][y]=2;
             }
@@ -54,7 +54,7 @@ var bfs=func(begin,end){
 }
 
 # enable ANSI escape sequence
-if(os.platform()=="windows")
+if (os.platform()=="windows")
     system("color");
 print("\ec");
 bfs([0,0],[9,19]);
\ No newline at end of file
diff --git a/test/bp.nas b/test/bp.nas
index 88dadf9..198ac38 100644
--- a/test/bp.nas
+++ b/test/bp.nas
@@ -2,7 +2,7 @@ use std.mat;
 
 rand(time(0));
 
-var new_neuron=func(){
+var new_neuron = func() {
     return {
         in:0,
         out:0,
@@ -12,18 +12,18 @@ var new_neuron=func(){
     };
 }
 
-var tanh=func(x){
+var tanh = func(x) {
     var (a,b)=(math.exp(x),math.exp(-x));
     return (a-b)/(a+b);
 }
-var difftanh=func(x){
+var difftanh = func(x) {
     x=tanh(x);
     return 1-x*x;
 }
-var sigmoid=func(x){
+var sigmoid = func(x) {
     return 1/(1+math.exp(-x));
 }
-var diffsigmoid=func(x){
+var diffsigmoid = func(x) {
     x=sigmoid(x);
     return x*(1-x);
 }
@@ -33,7 +33,7 @@ var training_set=[[0,0],[0,1],[1,0],[1,1]];
 var expect=[0,1,1,0];
 
 var hidden=[];
-for(var i=0;i<hnum;i+=1){
+for(var i=0;i<hnum;i+=1) {
     append(hidden,new_neuron());
     for(var j=0;j<inum;j+=1)
         append(hidden[i].w,rand()>0.5?-2*rand():2*rand());
@@ -41,22 +41,22 @@ for(var i=0;i<hnum;i+=1){
 }
 
 var output=[];
-for(var i=0;i<onum;i+=1){
+for(var i=0;i<onum;i+=1) {
     append(output,new_neuron());
     for(var j=0;j<hnum;j+=1)
         append(output[i].w,rand()>0.5?-2*rand():2*rand());
     output[i].bia=rand()>0.5?-5*rand():5*rand();
 }
 
-var forward=func(x){
+var forward = func(x) {
     var input=training_set[x];
-    for(var i=0;i<hnum;i+=1){
+    for(var i=0;i<hnum;i+=1) {
         hidden[i].in=hidden[i].bia;
         for(var j=0;j<inum;j+=1)
             hidden[i].in+=hidden[i].w[j]*input[j];
         hidden[i].out=tanh(hidden[i].in);
     }
-    for(var i=0;i<onum;i+=1){
+    for(var i=0;i<onum;i+=1) {
         output[i].in=output[i].bia;
         for(var j=0;j<hnum;j+=1)
             output[i].in+=output[i].w[j]*hidden[j].out;
@@ -64,15 +64,15 @@ var forward=func(x){
     }
     return;
 }
-var run=func(vec){
+var run = func(vec) {
     var input=vec;
-    for(var i=0;i<hnum;i+=1){
+    for(var i=0;i<hnum;i+=1) {
         hidden[i].in=hidden[i].bia;
         for(var j=0;j<inum;j+=1)
             hidden[i].in+=hidden[i].w[j]*input[j];
         hidden[i].out=tanh(hidden[i].in);
     }
-    for(var i=0;i<onum;i+=1){
+    for(var i=0;i<onum;i+=1) {
         output[i].in=output[i].bia;
         for(var j=0;j<hnum;j+=1)
             output[i].in+=output[i].w[j]*hidden[j].out;
@@ -80,24 +80,24 @@ var run=func(vec){
     }
     return;
 }
-var get_error=func(x){
+var get_error = func(x) {
     return 0.5*(expect[x]-output[0].out)*(expect[x]-output[0].out);
 }
-var backward=func(x){
+var backward = func(x) {
     var input=training_set[x];
     output[0].diff=(expect[x]-output[0].out)*diffsigmoid(output[0].in);
-    for(var i=0;i<hnum;i+=1){
+    for(var i=0;i<hnum;i+=1) {
         hidden[i].diff=0;
         for(var j=0;j<onum;j+=1)
             hidden[i].diff+=output[j].w[i]*output[j].diff;
         hidden[i].diff*=difftanh(hidden[i].in);
     }
-    for(var i=0;i<hnum;i+=1){
+    for(var i=0;i<hnum;i+=1) {
         hidden[i].bia+=hidden[i].diff;
         for(var j=0;j<inum;j+=1)
             hidden[i].w[j]+=hidden[i].diff*input[j];
     }
-    for(var i=0;i<onum;i+=1){
+    for(var i=0;i<onum;i+=1) {
         output[i].bia+=output[i].diff;
         for(var j=0;j<hnum;j+=1)
             output[i].w[j]+=output[i].diff*hidden[j].out;
@@ -106,23 +106,23 @@ var backward=func(x){
 }
 
 var (cnt,error)=(0,100);
-while(error>0.0005){
+while(error>0.0005) {
     error=0;
-    for(var i=0;i<4;i+=1){
+    for(var i=0;i<4;i+=1) {
         forward(i);
         error+=get_error(i);
         backward(i);
     }
     cnt+=1;
-    if(cnt>=1e4)
+    if (cnt>=1e4)
         break;
 }
-if(cnt>=3e5){
+if (cnt>=3e5) {
     print("failed to train, ",cnt," epoch.\n");
-}else{
+} else {
     print('finished after ',cnt,' epoch.\n');
 }
-foreach(var v;training_set){
+foreach(var v;training_set) {
     run(v);
     print(v,': ',output[0].out,'\n');
 }
diff --git a/test/calc.nas b/test/calc.nas
index 516a2db..98a3d41 100644
--- a/test/calc.nas
+++ b/test/calc.nas
@@ -2,18 +2,18 @@ use std.padding;
 use std.file;
 
 var source=file.find_all_files_with_extension("./src","cpp","h");
-sort(source,func(a,b){return cmp(a,b)<0});
+sort(source,func(a,b) {return cmp(a,b)<0});
 
 var lib=file.find_all_files_with_extension("./std","nas");
-sort(lib,func(a,b){return cmp(a,b)<0});
+sort(lib,func(a,b) {return cmp(a,b)<0});
 
 var testfile=file.find_all_files_with_extension("./test","nas");
-sort(testfile,func(a,b){return cmp(a,b)<0});
+sort(testfile,func(a,b) {return cmp(a,b)<0});
 
 var module=file.find_all_files_with_extension("./module","cpp","nas");
-sort(module,func(a,b){return cmp(a,b)<0});
+sort(module,func(a,b) {return cmp(a,b)<0});
 
-var longest=func(vec...){
+var longest = func(vec...) {
     var len=0;
     foreach(var v;vec)
         foreach(var f;v)
@@ -22,41 +22,41 @@ var longest=func(vec...){
 }
 var padding_length=longest(source,lib,testfile,module);
 
-var blank=func(s){
-    if(!size(s)){
+var blank = func(s) {
+    if (!size(s)) {
         return 1;
     }
     var space=[" "[0],"\n"[0],"\t"[0],"\r"[0]];
-    for(var i=0;i<size(s);i+=1){
+    for(var i=0;i<size(s);i+=1) {
         var flag=0;
-        foreach(var j;space){
-            if(s[i]==j){
+        foreach(var j;space) {
+            if (s[i]==j) {
                 flag=1;
             }
         }
-        if(!flag){
+        if (!flag) {
             return 0;
         }
     }
     return 1;
 }
 
-var count=func(s,c){
+var count = func(s,c) {
     var cnt=0;
     foreach(var i;split(c,s))
         cnt+=!blank(i);
     return cnt;
 }
 
-var column=func(number){
+var column = func(number) {
     number=number>=1000?substr(str(number/1000),0,4)~'k':str(number);
     return padding.leftpad(number,6);
 }
 
-var calc=func(codetype,files,path=""){
+var calc = func(codetype,files,path="") {
     println(codetype);
     var (bytes,ctx,line,semi,line_cnt,semi_cnt)=(0,"",0,0,0,0);
-    forindex(var i;files){
+    forindex(var i;files) {
         var s=io.exists(path~files[i])?io.readfile(path~files[i]):"";
         (line_cnt,semi_cnt)=(count(s,'\n'),count(s,';'));
         println(padding.rightpad(files[i],padding_length),'|',
diff --git a/test/choice.nas b/test/choice.nas
index 6b04247..c2e9699 100644
--- a/test/choice.nas
+++ b/test/choice.nas
@@ -1,21 +1,21 @@
 var condition_true=1;
 var condition_false=0;
-if(condition_true) {
+if (condition_true) {
     var a=1;
-} else if(!condition_false) {
+} else if (!condition_false) {
     var b=1;
-} elsif(!condition_true and condition_false) {
+} elsif (!condition_true and condition_false) {
     print("impossible");
 } else {
     var c=1;
     var d=1;
 }
 
-if(condition_true)
+if (condition_true)
     var a=1;
-else if(!condition_false)
+else if (!condition_false)
     var b=1;
-elsif(!condition_true and condition_false)
+elsif (!condition_true and condition_false)
     print("impossible");
 else
     var c=1;
\ No newline at end of file
diff --git a/test/class.nas b/test/class.nas
index c326a05..a28cadc 100644
--- a/test/class.nas
+++ b/test/class.nas
@@ -1,4 +1,4 @@
-var student=func(n,a){
+var student = func(n,a) {
     return {
         print_info:func println(n,' ',a),
         set_age:   func(age) a=age,
@@ -19,31 +19,31 @@ s.set_name('Sidi Liang');
 s.print_info();
 println(s.get_age(),' ',s.get_name());
 # flightgear nasal-console cannot use this kind of object initializing
-var m=func(){
+var m = func() {
     var (_1,_2)=(0,1);
     return {
-        a:func(){
+        a:func() {
             print(_1,' ',_2,'\n');
         },
-        b:func(x){
+        b:func(x) {
             _1=x;
         },
-        c:func(x){
+        c:func(x) {
             _2=x;
         },
-        d:func(x){
-            return func{
+        d:func(x) {
+            return func {
                 print(_1,' ',_2,' ',x,'\n');
             };
         },
-        g:func(x){
+        g:func(x) {
             var y=x;
-            return func{
+            return func {
                 print(_1,' ',_2,' ',x,' ',y,'\n');
             }
         },
-        h:func(){
-            return func(x){
+        h:func() {
+            return func(x) {
                 _1=x;
             }
         }
diff --git a/test/console3D.nas b/test/console3D.nas
index 9226d68..0703a46 100644
--- a/test/console3D.nas
+++ b/test/console3D.nas
@@ -24,7 +24,7 @@
 use module.libmat;
 use std.runtime;
 
-func(){
+func() {
     # allocate more spaces
     for(var i = 0; i<10; i+=1) {
         runtime.gc.extend("str");
@@ -71,61 +71,61 @@ var (rotateX,rotateY,rotateZ)=(
     libmat.vec3.rz,
 );
 
-var use_raw=func(){
-    vec2=func(x,y){return [x,y];}
-    vec2add=func(v1,v2){return [v1[0]+v2[0],v1[1]+v2[1]];}
-    vec2sub=func(v1,v2){return [v1[0]-v2[0],v1[1]-v2[1]];}
-    vec2mul=func(v1,v2){return [v1[0]*v2[0],v1[1]*v2[1]];}
-    vec2div=func(v1,v2){return [v1[0]/v2[0],v1[1]/v2[1]];}
-    vec3=func(x,y,z){return [x,y,z];}
-    vec3add=func(v1,v2){return [v1[0]+v2[0],v1[1]+v2[1],v1[2]+v2[2]];}
-    vec3sub=func(v1,v2){return [v1[0]-v2[0],v1[1]-v2[1],v1[2]-v2[2]];}
-    vec3mul=func(v1,v2){return [v1[0]*v2[0],v1[1]*v2[1],v1[2]*v2[2]];}
-    vec3div=func(v1,v2){return [v1[0]/v2[0],v1[1]/v2[1],v1[2]/v2[2]];}
-    vec3neg=func(v){return [-v[0],-v[1],-v[2]];}
-    vec2len=func(v){var (x,y)=(v[0],v[1]); return sqrt(x*x+y*y);}
-    vec3len=func(v){var (x,y,z)=(v[0],v[1],v[2]); return sqrt(x*x+y*y+z*z);}
-    vec3norm=func(v){var t=vec3len(v); return vec3div(v,[t,t,t]);}
-    vec3dot=func(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2];}
-    rotateX=func(a,angle){return [a[0],a[2]*sin(angle)+a[1]*cos(angle),a[2]*cos(angle)-a[1]*sin(angle)];}
-    rotateY=func(a,angle){return [a[0]*cos(angle)-a[2]*sin(angle),a[1],a[0]*sin(angle)+a[2]*cos(angle)];}
-    rotateZ=func(a,angle){return [a[0]*cos(angle)-a[1]*sin(angle),a[0]*sin(angle)+a[1]*cos(angle),a[2]];}
+var use_raw = func() {
+    vec2 = func(x,y) {return [x,y];}
+    vec2add = func(v1,v2) {return [v1[0]+v2[0],v1[1]+v2[1]];}
+    vec2sub = func(v1,v2) {return [v1[0]-v2[0],v1[1]-v2[1]];}
+    vec2mul = func(v1,v2) {return [v1[0]*v2[0],v1[1]*v2[1]];}
+    vec2div = func(v1,v2) {return [v1[0]/v2[0],v1[1]/v2[1]];}
+    vec3 = func(x,y,z) {return [x,y,z];}
+    vec3add = func(v1,v2) {return [v1[0]+v2[0],v1[1]+v2[1],v1[2]+v2[2]];}
+    vec3sub = func(v1,v2) {return [v1[0]-v2[0],v1[1]-v2[1],v1[2]-v2[2]];}
+    vec3mul = func(v1,v2) {return [v1[0]*v2[0],v1[1]*v2[1],v1[2]*v2[2]];}
+    vec3div = func(v1,v2) {return [v1[0]/v2[0],v1[1]/v2[1],v1[2]/v2[2]];}
+    vec3neg = func(v) {return [-v[0],-v[1],-v[2]];}
+    vec2len = func(v) {var (x,y)=(v[0],v[1]); return sqrt(x*x+y*y);}
+    vec3len = func(v) {var (x,y,z)=(v[0],v[1],v[2]); return sqrt(x*x+y*y+z*z);}
+    vec3norm = func(v) {var t=vec3len(v); return vec3div(v,[t,t,t]);}
+    vec3dot = func(a,b) {return a[0]*b[0]+a[1]*b[1]+a[2]*b[2];}
+    rotateX = func(a,angle) {return [a[0],a[2]*sin(angle)+a[1]*cos(angle),a[2]*cos(angle)-a[1]*sin(angle)];}
+    rotateY = func(a,angle) {return [a[0]*cos(angle)-a[2]*sin(angle),a[1],a[0]*sin(angle)+a[2]*cos(angle)];}
+    rotateZ = func(a,angle) {return [a[0]*cos(angle)-a[1]*sin(angle),a[0]*sin(angle)+a[1]*cos(angle),a[2]];}
 }
 
-var clamp=func(value,_min,_max){
+var clamp = func(value,_min,_max) {
     return max(min(value,_max),_min);
 }
-var sign=func(a){
+var sign = func(a) {
     return (0<a)-(a<0);
 }
-var step=func(edge,x){
+var step = func(edge,x) {
     return x>edge;
 }
 
-var vec3abs=func(v){
+var vec3abs = func(v) {
     return [abs(v[0]),abs(v[1]),abs(v[2])];
 }
-var vec3sign=func(v){
+var vec3sign = func(v) {
     return [sign(v[0]),sign(v[1]),sign(v[2])];
 }
-var vec3step=func(edge,v){
+var vec3step = func(edge,v) {
     return [step(edge[0],v[0]),step(edge[1],v[1]),step(edge[2],v[2])];
 }
-var vec3reflect=func(rd,n){
+var vec3reflect = func(rd,n) {
     var d=vec3dot(n,rd);
     return vec3sub(rd,vec3mul(n,vec3mul([2,2,2],[d,d,d])));
 }
 
-var sphere=func(ro,rd,r) {
+var sphere = func(ro,rd,r) {
     var b=vec3dot(ro,rd);
     var c=vec3dot(ro,ro)-r*r;
     var h=b*b-c;
-    if(h<0.0) return [-1.0,-1.0];
+    if (h<0.0) return [-1.0,-1.0];
     h=sqrt(h);
     return [-b-h,-b+h];
 }
 
-var box=func(ro,rd,boxSize,outNormal) {
+var box = func(ro,rd,boxSize,outNormal) {
     var m=vec3div([1.0,1.0,1.0],rd);
     var n=vec3mul(m,ro);
     var k=vec3mul(vec3abs(m),boxSize);
@@ -143,11 +143,11 @@ var box=func(ro,rd,boxSize,outNormal) {
     return [tN, tF];
 }
 
-var plane=func(ro,rd,p,w) {
+var plane = func(ro,rd,p,w) {
     return -(vec3dot(ro,p)+w)/vec3dot(rd,p);
 }
 
-var main=func(frame) {
+var main = func(frame) {
 
     var height=15*2;
     var width=int(height*1/0.618)*2;
@@ -171,10 +171,10 @@ var main=func(frame) {
 
     print("\e[2J");
     var stamp=maketimestamp();
-    for(var t=0;t<frame;t+=1){
+    for(var t=0;t<frame;t+=1) {
         stamp.stamp();
-        for(var i=0;i<width;i+=1){
-            for(var j=0;j<height;j+=1){
+        for(var i=0;i<width;i+=1) {
+            for(var j=0;j<height;j+=1) {
                 var uv=vec2sub(vec2mul(vec2div([i,j],[width,height]),vec2_2_2),vec2_1_1);
                 uv[0]*=aspect*pixelAspect;
                 var ro=[-6,0,0];
@@ -184,30 +184,30 @@ var main=func(frame) {
                 ro=rotateZ(ro,t*0.03);
                 rd=rotateZ(rd,t*0.03);
                 var diff=1;
-                for (var k=0;k<5;k+=1){
+                for (var k=0;k<5;k+=1) {
                     var minIt=99999;
                     var intersection=sphere(vec3sub(ro,spherePos),rd,1);
                     var n=vec3_000;
                     var albedo=1;
-                    if(intersection[0]>0){
+                    if (intersection[0]>0) {
                         var itPoint=vec3add(vec3sub(ro,spherePos),vec3mul(rd,[intersection[0],intersection[0],intersection[0]]));
                         minIt=intersection[0];
                         n=vec3norm(itPoint);
                     }
                     var boxN=[0,0,0];
                     intersection=box(ro,rd,vec3_111,boxN);
-                    if(intersection[0]>0 and intersection[0]<minIt){
+                    if (intersection[0]>0 and intersection[0]<minIt) {
                         minIt=intersection[0];
                         n=boxN;
                     }
                     var tmp=plane(ro,rd,vec3_00n1,1);
                     intersection=[tmp,tmp];
-                    if(intersection[0]>0 and intersection[0]<minIt){
+                    if (intersection[0]>0 and intersection[0]<minIt) {
                         minIt=intersection[0];
                         n=vec3_00n1;
                         albedo=0.5;
                     }
-                    if(minIt<99999){
+                    if (minIt<99999) {
                         diff*=(vec3dot(n,light)*0.5+0.5)*albedo;
                         ro=vec3add(ro,vec3mul(rd,[minIt-0.01,minIt-0.01,minIt-0.01]));
                         rd=vec3reflect(rd,n);
@@ -220,9 +220,9 @@ var main=func(frame) {
             }
         }
         var s="";
-        forindex(var index;screen){
+        forindex(var index;screen) {
             s~=screen[index];
-            if(index+1-int((index+1)/width)*width==0)
+            if (index+1-int((index+1)/width)*width==0)
                 s~="\n";
         }
         var elt=stamp.elapsedMSec()/1000;
@@ -233,9 +233,9 @@ var main=func(frame) {
 var st=maketimestamp();
 var run=[0,0];
 var frame=1e3;
-if(size(runtime.argv())!=0){
+if (size(runtime.argv())!=0) {
     var n=num(runtime.argv()[0]);
-    if(!math.isnan(n)){
+    if (!math.isnan(n)) {
         frame=n;
     }
 }
diff --git a/test/coroutine.nas b/test/coroutine.nas
index 3eeacbb..b101049 100644
--- a/test/coroutine.nas
+++ b/test/coroutine.nas
@@ -1,49 +1,50 @@
 # coroutine.nas by ValKmjolnir
 # 2022/5/19
+use std.coroutine;
 use std.process_bar;
 use std.padding;
 
-if(os.platform()=="windows"){
+if (os.platform()=="windows") {
     system("chcp 65001");
     system("color");
 }
 
-var fib=func(){
+var fib = func() {
     var (a,b)=(1,1);
     coroutine.yield(a);
     coroutine.yield(b);
-    while(1){
+    while(1) {
         (a,b)=(b,a+b);
         coroutine.yield(b);
     }
     return;
 }
 var co=[coroutine.create(fib),coroutine.create(fib)];
-for(var i=0;i<45;i+=1){
+for(var i=0;i<45;i+=1) {
     var res=[coroutine.resume(co[0]),coroutine.resume(co[1])];
-    if(res[0]==nil or res[1]==nil or res[0][0]!=res[1][0])
+    if (res[0]==nil or res[1]==nil or res[0][0]!=res[1][0])
         die("different coroutines don't share the same local scope");
 }
 
 # test if coroutine can get upvalues
-func(){
+func() {
     var x=1;
-    var co=coroutine.create(func(){
-        for(var j=0;j<128;j+=1){
+    var co=coroutine.create(func() {
+        for(var j=0;j<128;j+=1) {
             coroutine.yield(x,i,j);
             x+=1;
         }
     });
-    for(var i=0;i<16;i+=1){
+    for(var i=0;i<16;i+=1) {
         var res=coroutine.resume(co);
-        if(res==nil or res[0]!=x or res[1]!=i)
+        if (res==nil or res[0]!=x or res[1]!=i)
             die("coroutine should have the ability to get upvalues");
     }
 }();
 
 # test coroutine.resume passing arguments to coroutine
-func{
-    var co=coroutine.create(func(){
+func {
+    var co=coroutine.create(func() {
         var (a,b)=coroutine.yield(a+b);
         println("coroutine.yield get ",a," ",b);
         (a,b)=coroutine.yield(a+b);
@@ -56,8 +57,8 @@ func{
 }();
 
 # test crash in coroutines
-var co=coroutine.create(func{
-    var b=func(){b()}
+var co=coroutine.create(func {
+    var b = func() {b()}
     coroutine.yield(b);
     b();
     coroutine.yield(0);
@@ -70,9 +71,9 @@ println("coroutine state:\e[91m ",coroutine.status(co),"\e[0m");
 println("coroutine yield: ",coroutine.resume(co));
 println("coroutine state:\e[91m ",coroutine.status(co),"\e[0m");
 
-var co=coroutine.create(func{
+var co=coroutine.create(func {
     var a=1;
-    var b=func(){
+    var b = func() {
         b();
     }
     coroutine.yield(b);
@@ -88,9 +89,9 @@ println("coroutine state:\e[91m ",coroutine.status(co),"\e[0m");
 println("ok");
 
 # pressure test
-for(var t=0;t<10;t+=1){
-    var productor=func(){
-        while(1){
+for(var t=0;t<10;t+=1) {
+    var productor = func() {
+        while(1) {
             coroutine.yield(i);
         }
     }
@@ -100,11 +101,11 @@ for(var t=0;t<10;t+=1){
 
     var counter=0;
     var bar=process_bar.high_resolution_bar(40);
-    var consumer=func(){
+    var consumer = func() {
         counter+=1;
         for(var i=0;i<t+1;i+=1)
             coroutine.resume(co);
-        if(counter-int(counter/1000)*1000==0){
+        if (counter-int(counter/1000)*1000==0) {
             var rate=counter/2e5;
             print(" ",bar.bar(rate)," ",
                 padding.leftpad(str(int(rate*100)),3),"% | ",
diff --git a/test/datalog.nas b/test/datalog.nas
index eab13ef..36f4a25 100644
--- a/test/datalog.nas
+++ b/test/datalog.nas
@@ -1,7 +1,7 @@
 use std.padding;
 use std.process_bar;
 
-var mess=func(vec) {
+var mess = func(vec) {
     srand();
     var s=size(vec);
     for(var i=s-1;i>=0;i-=1) {
@@ -10,7 +10,7 @@ var mess=func(vec) {
     }
 }
 
-var project=func(n) {
+var project = func(n) {
     # get(s) :- color(_, s, _).
 
     var ts=maketimestamp();
@@ -24,7 +24,7 @@ var project=func(n) {
     for(var i=0;i<n;i+=1) {
         color[i]=[i,"color "~i,i+n*10];
         # generate process bar, every 0.2%
-        if((i-last_step)/n>1/500) {
+        if ((i-last_step)/n>1/500) {
             last_step=i;
             print(" ",bar.bar((i+1)/n)," ",
                 padding.leftpad(str(int((i+1)/n*100)),3),"% | \r");
@@ -45,7 +45,7 @@ var project=func(n) {
     println(padding.rightpad(str(cnt),7)," in ",ts.elapsedMSec()/1000," s");
 }
 
-var select=func(n) {
+var select = func(n) {
     # get(s) :- color(_, _, x), message(x, s).
 
     var ts=maketimestamp();
@@ -62,7 +62,7 @@ var select=func(n) {
         color[i]=[i,"color "~i,i+n*10];
         message[i]=[i+n*10,"message "~i];
         # generate process bar, every 0.2%
-        if((i-last_step)/n>1/500) {
+        if ((i-last_step)/n>1/500) {
             last_step=i;
             print(" ",bar.bar((i+1)/n)," ",
                 padding.leftpad(str(int((i+1)/n*100)),3),"% | \r");
@@ -75,8 +75,8 @@ var select=func(n) {
     mess(message);
 
     ts.stamp();
-    sort(color,func(a,b){return a[2]<b[2]});
-    sort(message,func(a,b){return a[0]<b[0]});
+    sort(color,func(a,b) {return a[2]<b[2]});
+    sort(message,func(a,b) {return a[0]<b[0]});
 
     var cnt=0;
     foreach(var c;color) {
@@ -86,10 +86,10 @@ var select=func(n) {
         while(left<=right) {
             var mid=int((left+right)/2);
             var res=message[mid][0];
-            if(data==res) {
+            if (data==res) {
                 cnt+=1;
                 break;
-            } else if(data>res) {
+            } else if (data>res) {
                 left=mid+1;
             } else {
                 right=mid-1;
@@ -100,7 +100,7 @@ var select=func(n) {
     println(padding.rightpad(str(cnt),7)," in ",ts.elapsedMSec()/1000," s");
 }
 
-var cartesian=func(n) {
+var cartesian = func(n) {
     # get(x, y, z, a, b) :- color(x, y, z), message(a, b).
 
     var ts=maketimestamp();
@@ -117,7 +117,7 @@ var cartesian=func(n) {
         color[i]=[i,"color "~i,i+n*10];
         message[i]=[i+n*10,"message "~i];
         # generate process bar, every 0.2%
-        if((i-last_step)/n>1/500) {
+        if ((i-last_step)/n>1/500) {
             last_step=i;
             print(" ",bar.bar((i+1)/n)," ",
                 padding.leftpad(str(int((i+1)/n*100)),3),"% | \r");
diff --git a/test/diff.nas b/test/diff.nas
index 02ad2cc..9a7a492 100644
--- a/test/diff.nas
+++ b/test/diff.nas
@@ -1,4 +1,4 @@
-var myers=func(src,dst,show_table=0){
+var myers = func(src,dst,show_table=0) {
     (src,dst)=(split("\n",src),split("\n",dst));
     append(src,"");
     append(dst,"");
@@ -6,12 +6,12 @@ var myers=func(src,dst,show_table=0){
 
     var mat=[];
     setsize(mat,dst_len*src_len);
-    forindex(var i;mat){
+    forindex(var i;mat) {
         mat[i]=0;
     }
     var visited=[];
     setsize(visited,dst_len*src_len);
-    forindex(var i;visited){
+    forindex(var i;visited) {
         visited[i]=0;
     }
 
@@ -19,15 +19,15 @@ var myers=func(src,dst,show_table=0){
         forindex(var x;src)
             mat[y*src_len+x]=(src[x]==dst[y]);
 
-    if(show_table){
+    if (show_table) {
         var curve=[
             ["+---","|   "],
             ["+---","| \\ "]
         ];
         var s="";
-        forindex(var y;dst){
-            forindex(var t;curve[0]){
-                forindex(var x;src){
+        forindex(var y;dst) {
+            forindex(var t;curve[0]) {
+                forindex(var x;src) {
                     s~=curve[mat[y*src_len+x]][t];
                 }
                 s~=["+","|"][t]~"\n";
@@ -40,23 +40,23 @@ var myers=func(src,dst,show_table=0){
 
     var (total,path,vec)=([],[],[[0,0,-1]]);
     visited[0]=1;
-    while(size(vec)){
+    while(size(vec)) {
         append(total,vec);
         var tmp=[];
-        forindex(var i;vec){
+        forindex(var i;vec) {
             var elem=vec[i];
             var (x,y)=(elem[1],elem[0]);
 
             # find solution
-            if(x==src_len-1 and y==dst_len-1){
+            if (x==src_len-1 and y==dst_len-1) {
                 append(path,vec[i]);
-                for(var (prev,iter)=(elem[2],size(total)-1);iter>0;iter-=1){
+                for(var (prev,iter)=(elem[2],size(total)-1);iter>0;iter-=1) {
                     var t=total[iter-1][prev];
                     append(path,t);
                     prev=t[2];
                 }
 
-                if(show_table){
+                if (show_table) {
                     for(var t=size(path)-1;t>=0;t-=1)
                         print("("~path[t][1]~","~path[t][0]~")",t==0?"":"->");
                     println();
@@ -66,16 +66,16 @@ var myers=func(src,dst,show_table=0){
                 for(var t=0;t<size(path)/2;t+=1)
                     (path[t],path[-1-t])=(path[-1-t],path[t]);
                 # print diff
-                for(var t=1;t<size(path);t+=1){
+                for(var t=1;t<size(path);t+=1) {
                     var (prev_x,prev_y)=(path[t-1][1],path[t-1][0]);
                     var (x,y)=(path[t][1],path[t][0]);
                     var (sub_x,sub_y)=(x-prev_x,y-prev_y);
-                    if(sub_x==1 and sub_y==1){
-                        if(show_table)
+                    if (sub_x==1 and sub_y==1) {
+                        if (show_table)
                             println("    ",src[prev_x]);
-                    }elsif(sub_x==1 and sub_y==0){
+                    } elsif (sub_x==1 and sub_y==0) {
                         println("\e[31m -  ",src[prev_x],"\e[0m");
-                    }elsif(sub_x==0 and sub_y==1){
+                    } elsif (sub_x==0 and sub_y==1) {
                         println("\e[32m +  ",dst[prev_y],"\e[0m");
                     }
                 }
@@ -83,18 +83,18 @@ var myers=func(src,dst,show_table=0){
             }
 
             # do bfs
-            if(mat[y*src_len+x]==1){
-                if(x+1<src_len and y+1<dst_len and visited[(y+1)*src_len+x+1]==0){
+            if (mat[y*src_len+x]==1) {
+                if (x+1<src_len and y+1<dst_len and visited[(y+1)*src_len+x+1]==0) {
                     append(tmp,[y+1,x+1,i]);
                     visited[(y+1)*src_len+x+1]=1;
                 }
             }
-            else{
-                if(x+1<src_len and visited[y*src_len+x+1]==0){
+            else {
+                if (x+1<src_len and visited[y*src_len+x+1]==0) {
                     append(tmp,[y,x+1,i]);
                     visited[y*src_len+x+1]=1;
                 }
-                if(y+1<dst_len and visited[(y+1)*src_len+x]==0){
+                if (y+1<dst_len and visited[(y+1)*src_len+x]==0) {
                     append(tmp,[y+1,x,i]);
                     visited[(y+1)*src_len+x]=1;
                 }
@@ -104,7 +104,7 @@ var myers=func(src,dst,show_table=0){
     }
 }
 
-func(diff){
+func(diff) {
     diff(
         "var a=0;\nvar b=1;\nprint(\"hello \",a);\nvar c=2;\nc=[];\nvar d=3;\nvar l=list();\nvar q=queue();\n",
         "var a=0;\nvar b=1;\nb=[];\nprintln(\"hello \",a);\nvar c=2;\nvar d=3;\nprintln(\"hello world!\");\nvar l=list();\nvar q=queue();\n",
diff --git a/test/donuts.nas b/test/donuts.nas
index 58dac11..8d8bcc3 100644
--- a/test/donuts.nas
+++ b/test/donuts.nas
@@ -2,7 +2,7 @@ use std.runtime;
 
 var mod = math.mod;
 
-var main=func(run_time){
+var main = func(run_time) {
     var ts=maketimestamp();
 
     var (sin,cos)=(math.sin,math.cos);
@@ -14,14 +14,14 @@ var main=func(run_time){
     setsize(b,1760);
 
     print("\e[2J");
-    for(var run=0;run<run_time;run+=1){
+    for(var run=0;run<run_time;run+=1) {
         ts.stamp();
-        forindex(var i;b){
+        forindex(var i;b) {
             b[i]=" ";
             z[i]=0;
         }
-        for(var j=0;j<6.28;j+=0.07){
-            for(var i=0;i<6.28;i+=0.02){
+        for(var j=0;j<6.28;j+=0.07) {
+            for(var i=0;i<6.28;i+=0.02) {
                 var (c,d,e,f,g)=(sin(i),cos(j),sin(A),sin(j),cos(A));
                 var h=d+2;
                 var D=1/(c*h*e+f*g+5);
@@ -31,7 +31,7 @@ var main=func(run_time){
                 var y=int(12+15*D*(l*h*n+t*m));
                 var o=int(x+80*y);
                 var N=int(8*((f*e-c*d*g)*m-c*d*e-f*g-l*d*n));
-                if(22>y and y>0 and x>0 and 80>x and D>z[o]){
+                if (22>y and y>0 and x>0 and 80>x and D>z[o]) {
                     z[o]=D;
                     b[o]=chars[N>0?N:0];
                 }
@@ -49,8 +49,8 @@ var main=func(run_time){
     }
 }
 
-if(size(runtime.argv()) and !math.isnan(num(runtime.argv()[0]))){
+if (size(runtime.argv()) and !math.isnan(num(runtime.argv()[0]))) {
     main(num(runtime.argv()[0]));
-}else{
+} else {
     main(5e2);
 }
\ No newline at end of file
diff --git a/test/exception.nas b/test/exception.nas
index 207e62b..a6160e6 100644
--- a/test/exception.nas
+++ b/test/exception.nas
@@ -1,22 +1,22 @@
 var ResultTrait={
-    Ok:func(val){
+    Ok:func(val) {
         me.ok=val;
         me.flag=0;
         return me;
     },
-    Err:func(info){
+    Err:func(info) {
         me.err=info;
         me.flag=1;
         return me;
     },
-    unwrap:func(){
-        if(me.flag)
+    unwrap:func() {
+        if (me.flag)
             die(me.err);
         return me.ok;
     }
 };
 
-var Result=func(){
+var Result = func() {
     return{
         ok:nil,
         err:"",
@@ -25,11 +25,11 @@ var Result=func(){
     };
 };
 
-var a=func(){
+var a = func() {
     return Result().Ok("hello world");
 }
 
-var b=func(){
+var b = func() {
     return Result().Err("exception test");
 }
 
diff --git a/test/feigenbaum.nas b/test/feigenbaum.nas
index e7aab39..009b8ad 100644
--- a/test/feigenbaum.nas
+++ b/test/feigenbaum.nas
@@ -37,12 +37,13 @@ var RGB = func(h, w) {
     }
 
     var progress = (h*width+w+1)/(width*height);
-    if(progress*100-int(progress*100)==0){
+    if (progress*100-int(progress*100)==0) {
         print(bar.bar(progress), " ", progress*100, "%          \r");
     }
 
     var c = char(res);
     return c~c~c;
 }
+
 ppm("feigenbaum.ppm", width, height, RGB);
 println();
\ No newline at end of file
diff --git a/test/fib.nas b/test/fib.nas
index 49501cd..841ccca 100644
--- a/test/fib.nas
+++ b/test/fib.nas
@@ -1,8 +1,6 @@
-var fib=func(x)
-{
-    if(x<2) return x;
+var fib = func(x) {
+    if (x<2) return x;
     return fib(x-1)+fib(x-2);
 }
 for(var i=0;i<31;i+=1)
     print(fib(i),'\n');
-    
\ No newline at end of file
diff --git a/test/filesystem.nas b/test/filesystem.nas
index 87b6347..92d6521 100644
--- a/test/filesystem.nas
+++ b/test/filesystem.nas
@@ -1,5 +1,5 @@
-var files=func(path){
-    if(!io.exists(path))
+var files = func(path) {
+    if (!io.exists(path))
         return [];
     var dd=unix.opendir(path);
     var res=[];
@@ -8,30 +8,30 @@ var files=func(path){
     unix.closedir(dd);
     return res;
 }
-var prt=func(s,path){
+var prt = func(s,path) {
     var vec=files(path);
     var last=size(vec)-1;
-    forindex(var i;vec){
+    forindex(var i;vec) {
         var f=vec[i];
-        if(f=="." or f=="..")
+        if (f=="." or f=="..")
             continue;
         foreach(var j;s)
             print("\e[34m",j,"\e[0m");
-        if(unix.isdir(path~"/"~f)){
+        if (unix.isdir(path~"/"~f)) {
             println("\e[34m",i==last?" └─":" ├─","\e[0m\e[33m[",f,"]\e[36m>\e[0m");
             append(s,i==last?"   ":" │ ");
             prt(s,path~"/"~f);
             pop(s);
-        }elsif(unix.isfile(path~"/"~f)){
+        } elsif (unix.isfile(path~"/"~f)) {
             println("\e[34m",i==last?" └─":" ├─","\e[0m\e[32m",f,"\e[0m");
-        }else{
+        } else {
             println("\e[34m",i==last?" └─":" ├─","\e[0m\e[91m",f,"\e[0m");
         }
     }
 }
 
 # enable unicode
-if(os.platform()=="windows")
+if (os.platform()=="windows")
     system("chcp 65001");
 println("\e[33m[",unix.getcwd(),"]\e[36m>\e[0m");
 prt([""],".");
\ No newline at end of file
diff --git a/test/hexdump.nas b/test/hexdump.nas
index d77c15e..b90606d 100644
--- a/test/hexdump.nas
+++ b/test/hexdump.nas
@@ -4,7 +4,7 @@ use std.file;
 use std.runtime;
 
 # init
-var hex=func(){
+var hex = func() {
     var hex_num=[
         '0','1','2','3',
         '4','5','6','7',
@@ -12,8 +12,8 @@ var hex=func(){
         'c','d','e','f'
     ];
     var res=[];
-    foreach(var i;hex_num){
-        foreach(var j;hex_num){
+    foreach(var i;hex_num) {
+        foreach(var j;hex_num) {
             append(res,i~j);
         }
     }
@@ -21,11 +21,11 @@ var hex=func(){
 }();
 
 # read file
-var s=func(){
+var s = func() {
     var filename = file.find_all_files_with_extension("./src","cpp","h");
-    if(size(runtime.argv())!=0){
+    if (size(runtime.argv())!=0) {
         var argv=runtime.argv();
-        if(argv[0]=="-h" or argv[0]=="--h"){
+        if (argv[0]=="-h" or argv[0]=="--h") {
             println("usage:");
             println("  nasal hexdump.nas        | get all files' hexdump.");
             println("  nasal hexdump.nas [file] | get single file's hexdump.");
@@ -46,24 +46,24 @@ var cnt=0;
 var hex_index=[0,0,0,0];
 
 # print binary in text format
-var textprint=func(index){
+var textprint = func(index) {
     var info="";
-    if(os.platform()=="windows"){
+    if (os.platform()=="windows") {
         for(var i=index-cnt;i<index;i+=1)
             info~=(s[i]<32 or s[i]>=127)?".":chr(s[i]);
-    }else{
+    } else {
         for(var i=index-cnt;i<index;i+=1)
             info~=(s[i]<32 or s[i]==127)?".":chr(s[i]);
     }
-    for(var i=cnt;i<16;i+=1){
+    for(var i=cnt;i<16;i+=1) {
         info~=".";
     }
     return " |"~info~"|\n";
 }
 
 # print index
-var indexprint=func(index){
-    forindex(var i;hex_index){
+var indexprint = func(index) {
+    forindex(var i;hex_index) {
         hex_index[i]=index-int(index/256)*256;
         index=int(index/256);
     }
@@ -74,25 +74,25 @@ var indexprint=func(index){
 }
 
 # main
-func(){
-    if(!size(s)){
+func() {
+    if (!size(s)) {
         return;
     }
     var info=indexprint(0);
-    for(var i=0;i<size(s);i+=1){
-        if(cnt==16){
+    for(var i=0;i<size(s);i+=1) {
+        if (cnt==16) {
             info~=textprint(i);
             print(info);
             cnt=0;
             info=indexprint(i);
-        }elsif(cnt==8)
+        } elsif (cnt==8)
             info~=" ";
         cnt+=1;
         info~=hex[s[i]]~" ";
     }
     for(var l=cnt;l<16;l+=1)
         info~="   ";
-    if(cnt<=8)
+    if (cnt<=8)
         info~=" ";
     info~=textprint(i);
     print(info);
diff --git a/test/httptest.nas b/test/httptest.nas
index ff6edf5..3ec6719 100644
--- a/test/httptest.nas
+++ b/test/httptest.nas
@@ -2,12 +2,12 @@ use module.libsock;
 
 var socket = libsock.socket;
 
-var http=func(){
+var http = func() {
     var sd=nil;
     return {
-        establish:func(ip,port){
+        establish:func(ip,port) {
             sd=socket.socket(socket.AF_INET,socket.SOCK_STREAM,socket.IPPROTO_IP);
-            while(socket.bind(sd,ip,port)<0){
+            while(socket.bind(sd,ip,port)<0) {
                 println("[",os.time(),"] failed to bind socket "~sd~" at IP: "~ip~" port: "~port~".");
                 unix.sleep(5);
                 println("[",os.time(),"] retrying...");
@@ -15,21 +15,21 @@ var http=func(){
             socket.listen(sd,1);
             println("[",os.time(),"] start server at [",ip,":",port,"]");
         },
-        shutdown:func(){
+        shutdown:func() {
             println("[",os.time(),"] shutdown server");
             socket.closesocket(sd);
         },
-        accept:func(){
+        accept:func() {
             return socket.accept(sd);
         },
-        disconnect:func(client,log=0){
-            if(log)
+        disconnect:func(client,log=0) {
+            if (log)
                 println("[",os.time(),"] [",client.ip,"] disconnected");
             return socket.closesocket(client.sd);
         },
-        recv:func(client){
+        recv:func(client) {
             var data=socket.recv(client.sd,2048);
-            if(!data.size){
+            if (!data.size) {
                 println("[",os.time(),"] [",client.ip,"] closed connection");
                 return nil;
             }
@@ -38,7 +38,7 @@ var http=func(){
             println("[",os.time(),"] [",client.ip,"] request ",type," [",path,"]");
             return {type:type,path:path};
         },
-        send:func(client,content){
+        send:func(client,content) {
             println("[",os.time(),"] [",client.ip,"] get size ",size(content)," byte(s)");
             return socket.send(client.sd,content);
         }
@@ -75,7 +75,7 @@ var highlight_style="
     code.note {color: #808080;}
 </style>";
 
-var html_read_file=func(filename){
+var html_read_file = func(filename) {
     var timer=maketimestamp();
     timer.stamp();
     var keyword=["var","func","for","while","foreach","forindex","break","continue","return","if","else","elsif","nil"];
@@ -83,152 +83,152 @@ var html_read_file=func(filename){
     var (s,index,len)=("",-1,size(file_text));
     var content="";
 
-    var next=func(){
-        if(index+1>=len)
+    var next = func() {
+        if (index+1>=len)
             return index+1;
         index+=1;
         s=char(file_text[index]);
         return index;
     }
-    var prev=func(){
+    var prev = func() {
         index-=1;
         s=char(file_text[index]);
     }
 
-    while(1){
-        if(next()>=len)
+    while(1) {
+        if (next()>=len)
             break;
-        if(s==">")
+        if (s==">")
             content~="<code class=\"opr\">&gt;</code>";
-        elsif(s=="<")
+        elsif (s=="<")
             content~="<code class=\"opr\">&lt;</code>";
-        elsif(s=="[" or s=="]" or s=="(" or s==")" or s=="{" or s=="}")
+        elsif (s=="[" or s=="]" or s=="(" or s==")" or s=="{" or s=="}")
             content~="<code class=\"brace\">"~s~"</code>";
-        elsif(s=="=" or s=="," or s==";" or s==":" or s=="|" or s=="&" or s=="!" or s=="?" or s=="+" or s=="-" or s=="*" or s=="/" or s=="~" or s==".")
+        elsif (s=="=" or s=="," or s==";" or s==":" or s=="|" or s=="&" or s=="!" or s=="?" or s=="+" or s=="-" or s=="*" or s=="/" or s=="~" or s==".")
             content~="<code class=\"opr\">"~s~"</code>";
-        elsif(s=="_" or ("a"[0]<=s[0] and s[0]<="z"[0]) or ("A"[0]<=s[0] and s[0]<="Z"[0]) or s[0]<0 or s[0]>=128){
+        elsif (s=="_" or ("a"[0]<=s[0] and s[0]<="z"[0]) or ("A"[0]<=s[0] and s[0]<="Z"[0]) or s[0]<0 or s[0]>=128) {
             var tmp=""~s; # generate a new string
-            while(1){
-                if(next()>=len)
+            while(1) {
+                if (next()>=len)
                     break;
-                if(s=="_" or ("a"[0]<=s[0] and s[0]<="z"[0]) or ("A"[0]<=s[0] and s[0]<="Z"[0]) or ("0"[0]<=s[0] and s[0]<="9"[0]) or s[0]<0 or s[0]>=128)
+                if (s=="_" or ("a"[0]<=s[0] and s[0]<="z"[0]) or ("A"[0]<=s[0] and s[0]<="Z"[0]) or ("0"[0]<=s[0] and s[0]<="9"[0]) or s[0]<0 or s[0]>=128)
                     tmp~=s;
-                else{
+                else {
                     prev();
                     break;
                 }
             }
             var is_key=0;
             foreach(var i;keyword)
-                if(tmp==i){
+                if (tmp==i) {
                     is_key=1;
                     content~="<code class=\"key\">"~tmp~"</code>";
                     break;
                 }
-            if(!is_key)
+            if (!is_key)
                 content~="<code class=\"id\">"~tmp~"</code>";
-        }elsif("0"[0]<=s[0] and s[0]<="9"[0]){
+        } elsif ("0"[0]<=s[0] and s[0]<="9"[0]) {
             content~="<code class=\"num\">"~s;
-            if(next()>=len){
+            if (next()>=len) {
                 content~="</code>";
                 break;
             }
-            if(s=="o"){
+            if (s=="o") {
                 content~="o";
-                while(1){
-                    if(next()>=len)
+                while(1) {
+                    if (next()>=len)
                         break;
-                    if("0"[0]<=s[0] and s[0]<="7"[0])
+                    if ("0"[0]<=s[0] and s[0]<="7"[0])
                         content~=s;
                     else
                         break;
                 }
                 content~="</code>";
                 prev();
-            }elsif(s=="x"){
+            } elsif (s=="x") {
                 content~="x";
-                while(1){
-                    if(next()>=len)
+                while(1) {
+                    if (next()>=len)
                         break;
-                    if(("0"[0]<=s[0] and s[0]<="9"[0]) or ("a"[0]<=s[0] and s[0]<='f') or ("A"[0]<=s[0] or s[0]<="F"))
+                    if (("0"[0]<=s[0] and s[0]<="9"[0]) or ("a"[0]<=s[0] and s[0]<='f') or ("A"[0]<=s[0] or s[0]<="F"))
                         content~=s;
                     else
                         break;
                 }
                 content~="</code>";
                 prev();
-            }elsif(("0"[0]<=s[0] and s[0]<="9"[0]) or s=="." or s=="e"){
-                while("0"[0]<=s[0] and s[0]<="9"[0]){
+            } elsif (("0"[0]<=s[0] and s[0]<="9"[0]) or s=="." or s=="e") {
+                while("0"[0]<=s[0] and s[0]<="9"[0]) {
                     content~=s;
-                    if(next()>=len)
+                    if (next()>=len)
                         break;
                 }
-                if(s=="."){
+                if (s==".") {
                     content~=s;
-                    if(next()>=len)
+                    if (next()>=len)
                         break;
                 }
-                while("0"[0]<=s[0] and s[0]<="9"[0]){
+                while("0"[0]<=s[0] and s[0]<="9"[0]) {
                     content~=s;
-                    if(next()>=len)
+                    if (next()>=len)
                         break;
                 }
-                if(s=="e"){
+                if (s=="e") {
                     content~=s;
-                    if(next()>=len)
+                    if (next()>=len)
                         break;
-                    if(s=="-" or s=="+"){
+                    if (s=="-" or s=="+") {
                         content~=s;
-                        if(next()>=len)
+                        if (next()>=len)
                             break;
                     }
                 }
-                while("0"[0]<=s[0] and s[0]<="9"[0]){
+                while("0"[0]<=s[0] and s[0]<="9"[0]) {
                     content~=s;
-                    if(next()>=len)
+                    if (next()>=len)
                         break;
                 }
                 prev();
                 content~="</code>";
-            }else{
+            } else {
                 prev();
                 content~="</code>";
             }
-        }elsif(s=="\"" or s=="'" or s=="`"){
+        } elsif (s=="\"" or s=="'" or s=="`") {
             var quot=s~""; # generate a new string
             content~="<code class=\"str\">"~s;
-            while(1){
-                if(next()>=len)
+            while(1) {
+                if (next()>=len)
                     break;
-                if(s==quot){
+                if (s==quot) {
                     content~=s~"</code>";
                     break;
-                }elsif(s=="\\"){
+                } elsif (s=="\\") {
                     content~=s;
-                    if(next()>=len)
+                    if (next()>=len)
                         break;
                     content~=s;
-                }elsif(s==">"){
+                } elsif (s==">") {
                     content~="&gt;";
-                }elsif(s=="<"){
+                } elsif (s=="<") {
                     content~="&lt;";
-                }else{
+                } else {
                     content~=s;
                 }
             }
-        }elsif(s=="#"){
+        } elsif (s=="#") {
             content~="<code class=\"note\">"~s;
-            while(1){
-                if(next()>=len)
+            while(1) {
+                if (next()>=len)
                     break;
-                if(s=="\n" or s=="\r"){
+                if (s=="\n" or s=="\r") {
                     content~=s;
                     break;
-                }elsif(s==">"){
+                } elsif (s==">") {
                     content~="&gt;";
-                }elsif(s=="<"){
+                } elsif (s=="<") {
                     content~="&lt;";
-                }else{
+                } else {
                     content~=s;
                 }
             }
@@ -242,11 +242,11 @@ var html_read_file=func(filename){
 }
 
 var respond={
-    ok:func(html){
+    ok:func(html) {
         println("[",os.time(),"] respond 200 OK");
         return "Http/1.1 200 OK\n\n"~html~"\n";
     },
-    not_found:func(){
+    not_found:func() {
         println("[",os.time(),"] respond 404 NOT FOUND");
         return "Http/1.1 404 NOT FOUND\n\n<!DOCTYPE html>
             <head>
@@ -260,7 +260,7 @@ var respond={
             </body>
         </html>\n";
     },
-    teapot:func(){
+    teapot:func() {
         println("[",os.time(),"] respond 418 I'm a teapot");
         return "Http/1.1 418 I'm a teapot\n\n<!DOCTYPE html>
             <head>
@@ -276,7 +276,7 @@ var respond={
     }
 };
 
-var files=func(){
+var files = func() {
     var res={};
     var dd=unix.opendir("./test");
     while((var name=unix.readdir(dd))!=nil)
@@ -284,61 +284,61 @@ var files=func(){
     return res;
 }();
 
-while(1){
+while(1) {
     var client=http.accept();
     var data=http.recv(client);
-    if(data==nil){
+    if (data==nil) {
         http.disconnect(client);
         continue;
     }
-    if(data.type=="GET"){
+    if (data.type=="GET") {
         var path=data.path;
         var args=split("?",path);
         var tmp={};
-        if(size(args)==2){
+        if (size(args)==2) {
             path=args[0];
             args=split("=",args[1]);
             for(var i=0;i<size(args);i+=2)
                 tmp[args[i]]=args[i+1];
         }
-        if(path=="/" or path=="/index"){
-            if(contains(tmp,"filename") and contains(files,tmp.filename)){
+        if (path=="/" or path=="/index") {
+            if (contains(tmp,"filename") and contains(files,tmp.filename)) {
                 var filename=tmp.filename;
                 var page="<!DOCTYPE html><head><title> "~filename~" </title><meta charset=\"utf-8\">"~highlight_style~"</head>\n<body><pre>\n";
                 var page_back="</pre>\n</body>\n</html>\n";
                 http.send(client,respond.ok(page~html_read_file("./test/"~filename)~page_back));
-            }else{
+            } else {
                 http.send(client,respond.ok(io.readfile("./doc/nasal-http-test-web.html")));
             }
         }
-        elsif(path=="/shutdown"){
+        elsif (path=="/shutdown") {
             http.send(client,respond.ok("http server shutdown."));
             break;
         }
-        elsif(path=="/favicon.ico")
+        elsif (path=="/favicon.ico")
             http.send(client,respond.ok(io.readfile("./doc/pic/favicon.ico")));
-        elsif(path=="/license")
+        elsif (path=="/license")
             http.send(client,respond.ok(io.readfile("./LICENSE")));
-        elsif(path=="/doc/pic/nasal.png" or
+        elsif (path=="/doc/pic/nasal.png" or
             path=="/doc/pic/social.png" or
             path=="/doc/pic/benchmark.png" or
             path=="/doc/pic/mandelbrot.png" or
             path=="/doc/pic/feigenbaum.png" or
             path=="/doc/pic/burningship.png")
             http.send(client,respond.ok(io.readfile("."~path)));
-        else{
+        else {
             var filename=substr(path,1,size(path)-1);
-            if(contains(files,filename)){
+            if (contains(files,filename)) {
                 var page="<!DOCTYPE html><head><title> "~filename~" </title><meta charset=\"utf-8\">"~highlight_style~"</head>\n<body><pre>\n";
                 var page_back="</pre>\n</body>\n</html>\n";
                 http.send(client,respond.ok(page~html_read_file("./test/"~filename)~page_back));
             }
-            elsif(filename=="teapot")
+            elsif (filename=="teapot")
                 http.send(client,respond.teapot());
             else
                 http.send(client,respond.not_found());
         }
-    }elsif(data.type=="POST"){
+    } elsif (data.type=="POST") {
         http.send(client,respond.not_found);
     }
     http.disconnect(client);
diff --git a/test/json.nas b/test/json.nas
index fbc053d..c8f3167 100644
--- a/test/json.nas
+++ b/test/json.nas
@@ -13,7 +13,7 @@ var ss = json.stringify({
     emptyvec:[],
     empty:[{}],
     empty_an:[[[[[[{}]]]]]],
-    function:func(){}
+    function:func() {}
 });
 
 println(ss, "\n");
@@ -30,7 +30,7 @@ var ss = json.stringify([{
     emptyhash:{},
     emptyvec:[],
     empty_an:[[[[[{}]]]]],
-    function:func(){}
+    function:func() {}
 }]);
 
 println(ss, "\n");
diff --git a/test/jsonrpc.nas b/test/jsonrpc.nas
index 56b4484..c5dfaa7 100644
--- a/test/jsonrpc.nas
+++ b/test/jsonrpc.nas
@@ -4,16 +4,16 @@ use std.runtime;
 
 var socket = libsock.socket;
 
-var gettime=func(){
+var gettime = func() {
     return split(" ",os.time())[1];
 }
 
-var jsonRPC=func(){
+var jsonRPC = func() {
     var sd=nil;
     return {
         establish:func(ip,port) {
             sd=socket.socket(socket.AF_INET,socket.SOCK_STREAM,socket.IPPROTO_IP);
-            if(socket.bind(sd,ip,port)<0) {
+            if (socket.bind(sd,ip,port)<0) {
                 println("[",gettime(),"] failed to bind socket ",sd," at ",ip,":",port);
                 return 0;
             }
@@ -42,23 +42,23 @@ var jsonRPC=func(){
             println("[",gettime(),"] disconnected");
             return socket.closesocket(client.sd);
         },
-        recv:func(client){
+        recv:func(client) {
             var data=socket.recv(client.sd,2048);
-            if(data.size<=0){
+            if (data.size<=0) {
                 println("[",gettime(),"] closed connection, recv failed");
                 return nil;
             }
             println("[",gettime(),"] receive ",data.str);
             return data.str;
         },
-        send:func(client,content){
+        send:func(client,content) {
             println("[",gettime(),"] sending ",content);
             return socket.send(client.sd,content);
         }
     };
 }();
 
-var server=func(ip,port) {
+var server = func(ip,port) {
     var methods={
         callHello:func(vec) {
             var res="hello ";
@@ -103,7 +103,7 @@ var server=func(ip,port) {
     jsonRPC.disconnect(client);
 }
 
-var client=func(ip,port) {
+var client = func(ip,port) {
     srand();
     var call_id=1;
     var methods=["callHello","notExist","onRandom"];
diff --git a/test/leetcode1319.nas b/test/leetcode1319.nas
index 5da0642..2ae7b5f 100644
--- a/test/leetcode1319.nas
+++ b/test/leetcode1319.nas
@@ -2,28 +2,27 @@
 var n=4;
 var input=[[0,1],[0,2],[1,2]];
 
-var find_root=func(x,parent)
-{
+var find_root = func(x,parent) {
     while(parent[x]!=nil)
         x=parent[x];
     return x;
 }
-var union_root=func(x,y,parent)
-{
+
+var union_root = func(x,y,parent) {
     var x_root=find_root(x,parent);
     var y_root=find_root(y,parent);
-    if(x_root==y_root) return 0;
+    if (x_root==y_root) return 0;
     else parent[x_root]=y_root;
     return 1;
 }
-var makeConnect=func(n,connections)
-{
-    if(size(connections)<n-1) return -1;
+
+var makeConnect = func(n,connections) {
+    if (size(connections)<n-1) return -1;
     var cnt=n-1;
     var parent=[];
     setsize(parent,n);
     foreach(var i;connections)
-        if(union_root(i[0],i[1],parent))
+        if (union_root(i[0],i[1],parent))
             cnt-=1;
     return cnt;
 }
diff --git a/test/lexer.nas b/test/lexer.nas
index 561eb57..6055a90 100644
--- a/test/lexer.nas
+++ b/test/lexer.nas
@@ -1,28 +1,27 @@
-var lexer=func(file)
-{
+var lexer = func(file) {
     var (ptr,token)=(0,[]);
     var s=io.readfile(file);
     var len=size(s);
     var line=0;
-    var gen=func(tok){
+    var gen = func(tok) {
         append(token,{
             line:line,
             token:tok
         });
     }
     return {
-        jmp_note:func(){
+        jmp_note:func() {
             while(ptr<len and s[ptr]!='\n'[0])
                 ptr+=1;
-            if(ptr<len and s[ptr]=='\n'[0])
+            if (ptr<len and s[ptr]=='\n'[0])
                 line+=1;
             ptr+=1;
         },
-        id_gen:func(){
+        id_gen:func() {
             var tmp="";
-            while(ptr<len){
+            while(ptr<len) {
                 var c=s[ptr];
-                if(('a'[0]<=c and c<='z'[0])
+                if (('a'[0]<=c and c<='z'[0])
                 or ('A'[0]<=c and c<='Z'[0])
                 or ('0'[0]<=c and c<='9'[0])
                 or c=='_'[0])
@@ -33,142 +32,142 @@ var lexer=func(file)
             }
             gen(tmp);
         },
-        str_gen:func(){
+        str_gen:func() {
             var str="";
             var mark=chr(s[ptr]);
             ptr+=1;
-            while(ptr<len and chr(s[ptr])!=mark){
-                if(chr(s[ptr])=='\\'){
+            while(ptr<len and chr(s[ptr])!=mark) {
+                if (chr(s[ptr])=='\\') {
                     ptr+=1;
                     var c=chr(s[ptr]);
                     if   (c=='a' ) str~='\a';
-                    elsif(c=='b' ) str~='\b';
-                    elsif(c=='e' ) str~='\e';
-                    elsif(c=='f' ) str~='\f';
-                    elsif(c=='n' ) str~='\n';
-                    elsif(c=='r' ) str~='\r';
-                    elsif(c=='t' ) str~='\t';
-                    elsif(c=='v' ) str~='\v';
-                    elsif(c=='?' ) str~='\?';
-                    elsif(c=='0' ) str~='\0';
-                    elsif(c=='\\') str~='\\';
-                    elsif(c=='\'') str~='\'';
-                    elsif(c=='\"') str~='\"';
+                    elsif (c=='b' ) str~='\b';
+                    elsif (c=='e' ) str~='\e';
+                    elsif (c=='f' ) str~='\f';
+                    elsif (c=='n' ) str~='\n';
+                    elsif (c=='r' ) str~='\r';
+                    elsif (c=='t' ) str~='\t';
+                    elsif (c=='v' ) str~='\v';
+                    elsif (c=='?' ) str~='\?';
+                    elsif (c=='0' ) str~='\0';
+                    elsif (c=='\\') str~='\\';
+                    elsif (c=='\'') str~='\'';
+                    elsif (c=='\"') str~='\"';
                     else           str~=c;
-                }else{
-                    if(s[ptr]=='\n'[0])
+                } else {
+                    if (s[ptr]=='\n'[0])
                         line+=1;
                     str~=chr(s[ptr]);
                 }
                 ptr+=1;
             }
-            if(ptr>=len)
+            if (ptr>=len)
                 print("read eof when generating string.\n");
             ptr+=1;
             gen(str);
         },
-        num_gen:func(){
+        num_gen:func() {
             var number=chr(s[ptr]);
             ptr+=1;
-            if(ptr<len and chr(s[ptr])=='x'){
+            if (ptr<len and chr(s[ptr])=='x') {
                 ptr+=1;
                 while(ptr<len and
                 ('a'[0]<=s[ptr] and s[ptr]<='f'[0]
-                or '0'[0]<=s[ptr] and s[ptr]<='9'[0])){
+                or '0'[0]<=s[ptr] and s[ptr]<='9'[0])) {
                     number~=chr(s[ptr]);
                     ptr+=1;
                 }
                 gen(num(number));
                 return;
-            }elsif(ptr<len and chr(s[ptr])=='o'){
+            } elsif (ptr<len and chr(s[ptr])=='o') {
                 ptr+=1;
-                while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='7'[0])){
+                while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='7'[0])) {
                     number~=chr(s[ptr]);
                     ptr+=1;
                 }
                 gen(num(number));
                 return;
             }
-            while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='9'[0])){
+            while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='9'[0])) {
                 number~=chr(s[ptr]);
                 ptr+=1;
             }
-            if(ptr<len and chr(s[ptr])=='.'){
+            if (ptr<len and chr(s[ptr])=='.') {
                 number~=chr(s[ptr]);
                 ptr+=1;
-                while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='9'[0])){
+                while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='9'[0])) {
                     number~=chr(s[ptr]);
                     ptr+=1;
                 }
             }
-            if(chr(s[ptr])=='e' or chr(s[ptr])=='E'){
+            if (chr(s[ptr])=='e' or chr(s[ptr])=='E') {
                 number~=chr(s[ptr]);
                 ptr+=1;
-                if(chr(s[ptr])=='-' or chr(s[ptr])=='+'){
+                if (chr(s[ptr])=='-' or chr(s[ptr])=='+') {
                     number~=chr(s[ptr]);
                     ptr+=1;
                 }
-                while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='9'[0])){
+                while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='9'[0])) {
                     number~=chr(s[ptr]);
                     ptr+=1;
                 }
             }
             var last_c=chr(number[-1]);
-            if(last_c=='.' or last_c=='e' or last_c=='E' or last_c=='-' or last_c=='+')
+            if (last_c=='.' or last_c=='e' or last_c=='E' or last_c=='-' or last_c=='+')
                 println("error number: ",number);
             gen(num(number));
         },
-        opr_gen:func(){
+        opr_gen:func() {
             var c=chr(s[ptr]);
-            if(c=='+' or c=='-' or c=='~' or c=='/' or c=='*' or c=='>' or c=='<' or c=='!' or c=='='){
+            if (c=='+' or c=='-' or c=='~' or c=='/' or c=='*' or c=='>' or c=='<' or c=='!' or c=='=') {
                 var tmp=c;
                 ptr+=1;
-                if(ptr<len and chr(s[ptr])=='='){
+                if (ptr<len and chr(s[ptr])=='=') {
                     tmp~=chr(s[ptr]);
                     ptr+=1;
                 }
                 gen(tmp);
                 return;
-            }elsif(c=='.'){
-                if(ptr+2<len and chr(s[ptr+1])=='.' and chr(s[ptr+2])=='.'){
+            } elsif (c=='.') {
+                if (ptr+2<len and chr(s[ptr+1])=='.' and chr(s[ptr+2])=='.') {
                     gen("...");
                     ptr+=3;
                 }
-                else{
+                else {
                     gen(".");
                     ptr+=1;
                 }
                 return;
             }
-            elsif(c!=' ' and c!='\t' and c!='\n' and c!='\r' and s[ptr]>0)
+            elsif (c!=' ' and c!='\t' and c!='\n' and c!='\r' and s[ptr]>0)
                 gen(c);
             ptr+=1;
             return;
         },
-        compile:func(){
+        compile:func() {
             line=1;
-            while(ptr<len){
+            while(ptr<len) {
                 var c=s[ptr];
-                if(c=='#'[0])
+                if (c=='#'[0])
                     me.jmp_note();
-                elsif(c=='\n'[0]){
+                elsif (c=='\n'[0]) {
                     line+=1;
                     ptr+=1;
                 }
-                elsif('a'[0]<=c and c<='z'[0]
+                elsif ('a'[0]<=c and c<='z'[0]
                     or 'A'[0]<=c and c<='Z'[0]
                     or c=='_'[0])
                     me.id_gen();
-                elsif(c=='\''[0] or c=='\"'[0])
+                elsif (c=='\''[0] or c=='\"'[0])
                     me.str_gen();
-                elsif('0'[0]<=c and c<='9'[0])
+                elsif ('0'[0]<=c and c<='9'[0])
                     me.num_gen();
                 else
                     me.opr_gen();
             }
             return;
         },
-        get_token:func(){return token;}
+        get_token:func() {return token;}
     };
 }
 
diff --git a/test/life.nas b/test/life.nas
index 3b6fb0e..8bdcbcb 100644
--- a/test/life.nas
+++ b/test/life.nas
@@ -1,19 +1,19 @@
 use std.process_bar;
 use std.runtime;
 
-var new_map=func(width,height){
+var new_map = func(width,height) {
     var tmp=[];
     setsize(tmp,height);
-    forindex(var i;tmp){
+    forindex(var i;tmp) {
         tmp[i]=[];
         setsize(tmp[i],width);
     }
     return tmp;
 }
 
-var prt=func(map){
+var prt = func(map) {
     var s='\e[H';
-    foreach(var line;map){
+    foreach(var line;map) {
         foreach(var elem;line)
             s~=elem~' ';
         s~='\n';
@@ -22,16 +22,16 @@ var prt=func(map){
     unix.sleep(1/160);
 }
 
-var run=func(width,height){
+var run = func(width,height) {
 
-    var check=func(_width,_height){
-        if(_height>=height) _height=0;
-        if(_width>=width) _width=0;
+    var check = func(_width,_height) {
+        if (_height>=height) _height=0;
+        if (_width>=width) _width=0;
         return map[_height][_width]=='O';
     }
 
     # enable ANSI escape sequence
-    if(os.platform()=="windows")
+    if (os.platform()=="windows")
         system("color");
     print("\ec");
     rand(time(0));
@@ -42,13 +42,13 @@ var run=func(width,height){
         forindex(var j;map[i])
             map[i][j]=rand()<0.45?'O':'.';
 
-    for(var r=0;r<100;r+=1){
+    for(var r=0;r<100;r+=1) {
         prt(map);
         for(var i=0;i<height;i+=1)
-            for(var j=0;j<width;j+=1){
+            for(var j=0;j<width;j+=1) {
                 var cnt=check(j,i+1)+check(j+1,i)+check(j,i-1)+check(j-1,i)+check(j+1,i+1)+check(j-1,i-1)+check(j+1,i-1)+check(j-1,i+1);
-                if(cnt==2)    tmp[i][j]=map[i][j];
-                elsif(cnt==3) tmp[i][j]='O';
+                if (cnt==2)    tmp[i][j]=map[i][j];
+                elsif (cnt==3) tmp[i][j]='O';
                 else          tmp[i][j]='.';
             }
         (map,tmp)=(tmp,map);
@@ -56,10 +56,10 @@ var run=func(width,height){
     return;
 };
 
-var ppm_gen=func(width,height){
+var ppm_gen = func(width,height) {
     var pixels=width*height;
 
-    var new_map=func(){
+    var new_map = func() {
         var tmp=[];
         setsize(tmp,pixels);
         return tmp;
@@ -68,9 +68,9 @@ var ppm_gen=func(width,height){
     # iteration counter and trigger for ppm/data generator
     var iter_to_print=0;
 
-    var init=func(){
+    var init = func() {
         var res=new_map();
-        if(io.exists(".life_data")) {
+        if (io.exists(".life_data")) {
             var vec=split("\n",io.readfile(".life_data"));
             if (num(vec[0])!=width or num(vec[1])!=height) {
                 die("incorrect width or height: "~vec[0]~":"~str(width)~" / "~vec[1]~":"~str(height))
@@ -78,7 +78,7 @@ var ppm_gen=func(width,height){
             iter_to_print=num(vec[2]);
             var data=vec[3];
             var n="1"[0];
-            for(var i=0;i<pixels;i+=1){
+            for(var i=0;i<pixels;i+=1) {
                 res[i]=data[i]==n?1:0;
             }
             return res;
@@ -94,23 +94,23 @@ var ppm_gen=func(width,height){
         return res;
     }
 
-    var store=func(){
+    var store = func() {
         var fd=io.open(".life_data","w");
         io.write(fd,str(width)~"\n"~str(height)~"\n"~str(iter_to_print)~"\n");
-        for(var i=0;i<pixels;i+=1){
+        for(var i=0;i<pixels;i+=1) {
             io.write(fd,map[i]==1?"1":"0");
         }
         io.close(fd);
     }
 
-    var gen=func(filename){
+    var gen = func(filename) {
         # P3 use ASCII number
         # P6 use binary character
         var fd=io.open(filename,"wb");
         io.write(fd,"P6\n"~width~" "~height~"\n255\n");
         var white=char(255)~char(255)~char(255);
         var black=char(0)~char(0)~char(0);
-        for(var i=0;i<pixels;i+=1){
+        for(var i=0;i<pixels;i+=1) {
             io.write(fd,map[i]==1?white:black);
         }
         io.close(fd);
@@ -121,27 +121,27 @@ var ppm_gen=func(width,height){
     var map=init();
     var tmp=new_map();
     
-    var check=func(_width,_height){
-        if(_height>=height) _height=0;
-        if(_width>=width) _width=0;
+    var check = func(_width,_height) {
+        if (_height>=height) _height=0;
+        if (_width>=width) _width=0;
         return map[_height*width+_width]==1;
     }
 
-    for(var r=0;r<1001;r+=1){
+    for(var r=0;r<1001;r+=1) {
         ts.stamp();
-        for(var i=0;i<height;i+=1){
-            for(var j=0;j<width;j+=1){
+        for(var i=0;i<height;i+=1) {
+            for(var j=0;j<width;j+=1) {
                 var cnt=check(j,i+1)+check(j+1,i)+check(j,i-1)+check(j-1,i)+check(j+1,i+1)+check(j-1,i-1)+check(j+1,i-1)+check(j-1,i+1);
-                if(cnt==2)    tmp[i*width+j]=map[i*width+j];
-                elsif(cnt==3) tmp[i*width+j]=1;
+                if (cnt==2)    tmp[i*width+j]=map[i*width+j];
+                elsif (cnt==3) tmp[i*width+j]=1;
                 else          tmp[i*width+j]=0;
             }
         }
         (map,tmp)=(tmp,map);
         var calc_tm=ts.elapsedMSec();
         var duration=int(calc_tm/1000*(1e3-r));
-        if(r-int(r/10)*10==0) {
-            if(r){
+        if (r-int(r/10)*10==0) {
+            if (r) {
                 store();
             }
             gen("iteration_"~str(iter_to_print)~".ppm");
diff --git a/test/loop.nas b/test/loop.nas
index 51f5bbd..e5e9503 100644
--- a/test/loop.nas
+++ b/test/loop.nas
@@ -1,5 +1,5 @@
 for(;;)break;
-for(;;){
+for(;;) {
     var a=1;
     break;
 }
@@ -10,7 +10,7 @@ for(var i=1;i<10;i+=1)
 print("\n");
 while(1)break;
 var j=0;
-while(j<10){
+while(j<10) {
     print(j," ");
     j+=1;
 }
@@ -19,7 +19,7 @@ print("\n");
 forindex(var j;[0,1,2,3])
     print(j," ");
 print("\n");
-forindex(var j;[0,1,2,3]){
+forindex(var j;[0,1,2,3]) {
     var a=j;
     print(a*a," ");
 }
@@ -27,15 +27,15 @@ print("\n");
 foreach(var j;[0,1,2,3])
     print([0,1,2,3][j]," ");
 print("\n");
-foreach(var j;[0,1,2,3]){
+foreach(var j;[0,1,2,3]) {
     var a=[0,1,2,3][j];
     print(a*a-1," ");
 }
 print("\n");
 
-var f=func(){
+var f = func() {
     var x=0;
-    return func(){x+=1;};
+    return func() {x+=1;};
 }();
 for(var i=0;i<4e6;i+=1)
     f();
\ No newline at end of file
diff --git a/test/mandelbrot.nas b/test/mandelbrot.nas
index 80f0fed..59722e3 100644
--- a/test/mandelbrot.nas
+++ b/test/mandelbrot.nas
@@ -1,16 +1,16 @@
 var (yMin,yMax,xMin,xMax,line)=(-0.2,0.2,-1.5,-1.0,"");
 var (yDel,xDel)=(yMax-yMin,xMax-xMin);
-for(var yPixel=0;yPixel<24;yPixel+=1){
+for(var yPixel=0;yPixel<24;yPixel+=1) {
     var y=(yPixel/24)*yDel+yMin;
-    for(var xPixel=0;xPixel<80;xPixel+=1){
+    for(var xPixel=0;xPixel<80;xPixel+=1) {
         var x=(xPixel/80)*xDel+xMin;
         var pixel=" ";
         var (x0,y0)=(x,y);
-        for(var iter=0;iter<80;iter+=1){
+        for(var iter=0;iter<80;iter+=1) {
             var x1=(x0*x0)-(y0*y0)+x;
             var y1=2*x0*y0+y;
             (x0,y0)=(x1,y1);
-            if((x0*x0)+(y0*y0)>4){
+            if ((x0*x0)+(y0*y0)>4) {
                 pixel=chr(" .:;+=xX$&"[iter/8]);
                 break;
             }
diff --git a/test/ppmgen.nas b/test/mandelbrotset.nas
similarity index 100%
rename from test/ppmgen.nas
rename to test/mandelbrotset.nas
diff --git a/test/mcpu.nas b/test/mcpu.nas
index 767d4dd..7860d2c 100644
--- a/test/mcpu.nas
+++ b/test/mcpu.nas
@@ -1,3 +1,5 @@
+use std.bits;
+
 var inst={
     inst_stop:0,
     inst_mov_reg_reg:1,
@@ -26,24 +28,24 @@ var inst={
     inst_out:24
 };
 
-var hex=func(){
+var hex = func() {
     var vec=[];
     foreach(var i;['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'])
         foreach(var j;['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'])
             append(vec,i~j);
-    return func(n){
+    return func(n) {
         return vec[n];
     }
 }();
 
-var hex32=func(n){
+var hex32 = func(n) {
     return hex(bits.u32_and(n/math.pow(2,24),0xff))~
     hex(bits.u32_and(n/math.pow(2,16),0xff))~
     hex(bits.u32_and(n/math.pow(2,8),0xff))~
     hex(bits.u32_and(n,0xff));
 }
 
-var machine=func(disk_file){
+var machine = func(disk_file) {
 
 var reg=[];
 var reg_size=32;
@@ -51,7 +53,7 @@ var pc=0;
 var ir=[0,0,0,0]; # 32 bit instruction word
 var mem=[];
 var mem_size=1024*1024*4; # memory size, byte
-var init=func(){
+var init = func() {
     println("[",os.time(),"] init ",reg_size," registers.");
     setsize(reg,reg_size); # 8 bit address wire
     for(var i=0;i<reg_size;i+=1)
@@ -63,7 +65,7 @@ var init=func(){
     println("[",os.time(),"] init completed.");
 }
 init();
-var load=func(){
+var load = func() {
     var vec=split(" ",disk_file);
     println("[",os.time(),"] loading boot from disk: ",size(vec)," byte.");
     forindex(var i;vec)
@@ -71,77 +73,77 @@ var load=func(){
     println("[",os.time(),"] loading complete.");
 }
 load();
-var ctx_info=func(){
+var ctx_info = func() {
     var cnt=0;
     println("pc    : 0x",hex32(pc));
     println("instr : 0x",hex(ir[0]),hex(ir[1]),hex(ir[2]),hex(ir[3]));
-    for(var i=0;i<reg_size;i+=1){
+    for(var i=0;i<reg_size;i+=1) {
         print("reg[",hex(i),"]: 0x",hex32(reg[i])," ");
-        if(cnt==3){
+        if (cnt==3) {
             print("\n");
             cnt=0;
-        }else{
+        } else {
             cnt+=1;
         }
     }
 }
-var exec=func(info=1){
+var exec = func(info=1) {
     println("[",os.time(),"] executing ...");
-    while(1){
+    while(1) {
         ir=[mem[pc],mem[pc+1],mem[pc+2],mem[pc+3]];
-        if(info)ctx_info();
+        if (info)ctx_info();
         var op=ir[0];
-        if(op==inst.inst_stop){
+        if (op==inst.inst_stop) {
             break;
-        }elsif(op==inst.inst_mov_reg_reg){
+        } elsif (op==inst.inst_mov_reg_reg) {
             reg[ir[1]]=reg[ir[2]];
-        }elsif(op==inst.inst_mov_reg_imm_low){
+        } elsif (op==inst.inst_mov_reg_imm_low) {
             reg[ir[1]]=bits.u32_and(reg[ir[1]],0xffff0000);
             reg[ir[1]]=bits.u32_or(reg[ir[1]],ir[2]*math.pow(2,8)+ir[3]);
-        }elsif(op==inst.inst_mov_reg_imm_high){
+        } elsif (op==inst.inst_mov_reg_imm_high) {
             reg[ir[1]]=bits.u32_and(reg[ir[1]],0x0000ffff);
             reg[ir[1]]=bits.u32_or(reg[ir[1]],ir[2]*math.pow(2,24)+ir[3]*math.pow(2,16));
-        }elsif(op==inst.inst_add){
+        } elsif (op==inst.inst_add) {
             reg[ir[1]]=bits.u32_and(reg[ir[2]]+reg[ir[3]],0xffffffff);
-        }elsif(op==inst.inst_sub){
+        } elsif (op==inst.inst_sub) {
             reg[ir[1]]=bits.u32_and(reg[ir[2]]-reg[ir[3]],0xffffffff);
-        }elsif(op==inst.inst_mult){
+        } elsif (op==inst.inst_mult) {
             reg[ir[1]]=bits.u32_and(reg[ir[2]]*reg[ir[3]],0xffffffff);
-        }elsif(op==inst.inst_div){
+        } elsif (op==inst.inst_div) {
             reg[ir[1]]=bits.u32_and(reg[ir[2]]/reg[ir[3]],0xffffffff);
-        }elsif(op==inst.inst_and){
+        } elsif (op==inst.inst_and) {
             reg[ir[1]]=bits.u32_and(reg[ir[2]],reg[ir[3]]);
-        }elsif(op==inst.inst_or){
+        } elsif (op==inst.inst_or) {
             reg[ir[1]]=bits.u32_or(reg[ir[2]],reg[ir[3]]);
-        }elsif(op==inst.inst_xor){
+        } elsif (op==inst.inst_xor) {
             reg[ir[1]]=bits.u32_xor(reg[ir[2]],reg[ir[3]]);
-        }elsif(op==inst.inst_not){
+        } elsif (op==inst.inst_not) {
             reg[ir[1]]=bits.u32_not(reg[ir[2]]);
-        }elsif(op==inst.inst_nand){
+        } elsif (op==inst.inst_nand) {
             reg[ir[1]]=bits.u32_nand(reg[ir[2]],reg[ir[3]]);
-        }elsif(op==inst.inst_shl){
+        } elsif (op==inst.inst_shl) {
             reg[ir[1]]=bits.u32_and(reg[ir[2]]*math.pow(2,reg[ir[3]]),0xffffffff);
-        }elsif(op==inst.inst_shr){
+        } elsif (op==inst.inst_shr) {
             reg[ir[1]]=bits.u32_and(reg[ir[2]]/math.pow(2,reg[ir[3]]),0xffffffff);
-        }elsif(op==inst.inst_jmp){
+        } elsif (op==inst.inst_jmp) {
             pc=reg[ir[1]];
-        }elsif(op==inst.inst_jt){
+        } elsif (op==inst.inst_jt) {
             pc=reg[ir[1]]?reg[ir[2]]:pc;
-        }elsif(op==inst.inst_jf){
+        } elsif (op==inst.inst_jf) {
             pc=reg[ir[1]]?pc:reg[ir[2]];
-        }elsif(op==inst.inst_les){
+        } elsif (op==inst.inst_les) {
             reg[ir[1]]=reg[ir[2]]<reg[ir[3]];
-        }elsif(op==inst.inst_grt){
+        } elsif (op==inst.inst_grt) {
             reg[ir[1]]=reg[ir[2]]>reg[ir[3]];
-        }elsif(op==inst.inst_leq){
+        } elsif (op==inst.inst_leq) {
             reg[ir[1]]=reg[ir[2]]<=reg[ir[3]];
-        }elsif(op==inst.inst_geq){
+        } elsif (op==inst.inst_geq) {
             reg[ir[1]]=reg[ir[2]]>=reg[ir[3]];
-        }elsif(op==inst.inst_eq){
+        } elsif (op==inst.inst_eq) {
             reg[ir[1]]=reg[ir[2]]==reg[ir[3]];
-        }elsif(op==inst.inst_in){
+        } elsif (op==inst.inst_in) {
             reg[0]=0; # unfinished
-        }elsif(op==inst.inst_out){
+        } elsif (op==inst.inst_out) {
             println("reg[",ir[1],"]: 0x",hex32(reg[ir[1]]));
         }
         pc+=4;
diff --git a/test/md5_self.nas b/test/md5_self.nas
index b7b3d54..692a22a 100644
--- a/test/md5_self.nas
+++ b/test/md5_self.nas
@@ -1,32 +1,34 @@
-var check=func(x){
-    if(x<0x100000000)
+use std.bits;
+
+var check = func(x) {
+    if (x<0x100000000)
         return x;
     return x-floor(x/0x100000000)*0x100000000;
 }
-var u32_bits_and=func(x,y){
+var u32_bits_and = func(x,y) {
     return bits.u32_and(check(x),check(y));
 }
-var u32_bits_or=func(x,y){
+var u32_bits_or = func(x,y) {
     return bits.u32_or(check(x),check(y));
 }
-var u32_bits_xor=func(x,y){
+var u32_bits_xor = func(x,y) {
     return bits.u32_xor(check(x),check(y));
 }
-var u32_bits_not=func(x){
+var u32_bits_not = func(x) {
     return bits.u32_not(check(x));
 }
 
-var hex32str=func(){
+var hex32str = func() {
     var ch=["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];
     var tbl=[];
     setsize(tbl,256);
-    for(var i=0;i<16;i+=1){
+    for(var i=0;i<16;i+=1) {
         for(var j=0;j<16;j+=1)
             tbl[i*16+j]=ch[i]~ch[j];
     }
-    return func(num){
+    return func(num) {
         var res="";
-        for(var i=0;i<4;i+=1){
+        for(var i=0;i<4;i+=1) {
             res~=tbl[u32_bits_and(num,0xff)];
             num=floor(num/256);
         }
@@ -34,7 +36,7 @@ var hex32str=func(){
     };
 }();
 
-var md5=func(){
+var md5 = func() {
     var K=[
         0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
         0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
@@ -59,42 +61,42 @@ var md5=func(){
         0,7,14,5,12,3,10,1,8,15,6,13,4,11,2,9
     ];
 
-    var l=func(num,cx){
-        for(var i=0;i<cx;i+=1){
+    var l = func(num,cx) {
+        for(var i=0;i<cx;i+=1) {
             num=check(num*2);
         }
         return num;
     }
-    var r=func(num,cx){
+    var r = func(num,cx) {
         num=check(num);
-        for(var i=0;i<cx;i+=1){
+        for(var i=0;i<cx;i+=1) {
             num=num/2;
         }
         return floor(num);
     }
-    var rol=func(num,cx){
+    var rol = func(num,cx) {
         return u32_bits_or(l(num,cx),r(num,32-cx));
     }
     # round 1
-    var F=func(x,y,z){
+    var F = func(x,y,z) {
         return u32_bits_or(
             u32_bits_and(x,y),
             u32_bits_and(u32_bits_not(x),z)
         );
     }
     # round 2
-    var G=func(x,y,z){
+    var G = func(x,y,z) {
         return u32_bits_or(
             u32_bits_and(x,z),
             u32_bits_and(y,u32_bits_not(z))
         );
     }
     # round 3
-    var H=func(x,y,z){
+    var H = func(x,y,z) {
         return u32_bits_xor(u32_bits_xor(x,y),z);
     }
     # round 4
-    var I=func(x,y,z){
+    var I = func(x,y,z) {
         return u32_bits_xor(
             y,
             u32_bits_or(x,u32_bits_not(z))
@@ -107,21 +109,21 @@ var md5=func(){
         I,I,I,I,I,I,I,I,I,I,I,I,I,I,I,I
     ];
 
-    return func(s){
+    return func(s) {
         var (s_size,len,res)=(size(s),size(s)*8,[]);
         setsize(res,s_size);
-        for(var i=0;i<s_size;i+=1){
+        for(var i=0;i<s_size;i+=1) {
             res[i]=s[i];
         }
         # +------len------+--1~512--+--64--+
         # |      text     |  fill   | size |
         # +---------------+---------+------+ N*512 bit
         var (mod,res_size)=(s_size-floor(s_size/64)*64,0);
-        if(mod==56){
+        if (mod==56) {
             res_size=s_size+64;
-        }elsif(mod<56){
+        } elsif (mod<56) {
             res_size=floor(s_size/64)*64+56;
-        }elsif(mod>56){
+        } elsif (mod>56) {
             res_size=floor(s_size/64)*64+120; # 512+448=960 960/8=120
         }
         setsize(res,res_size);
@@ -132,11 +134,11 @@ var md5=func(){
         # little endian
         setsize(res,size(res)+8);
         var (s_size,lower32,higher32)=(size(res),check(len),check(len/math.pow(2,32)));
-        for(var i=4;i>0;i-=1){
+        for(var i=4;i>0;i-=1) {
             res[s_size-4-i]=floor(lower32-floor(lower32/256)*256);
             lower32=floor(lower32/256);
         }
-        for(var i=4;i>0;i-=1){
+        for(var i=4;i>0;i-=1) {
             res[s_size-i]=floor(higher32-floor(higher32/256)*256);
             higher32=floor(higher32/256);
         }
@@ -146,7 +148,7 @@ var md5=func(){
         # this may only work when string's length is under 1<<51
         var tmp=[];
         setsize(tmp,size(res)/4);
-        for(var i=0;i<size(res);i+=4){
+        for(var i=0;i<size(res);i+=4) {
             tmp[i/4]=res[i+3]*math.pow(2,24)+
                 res[i+2]*math.pow(2,16)+
                 res[i+1]*math.pow(2,8)+
@@ -160,9 +162,9 @@ var md5=func(){
         var D=0x10325476;
 
         res_size=size(res);
-        for(var i=0;i<res_size;i+=16){
+        for(var i=0;i<res_size;i+=16) {
             var (f,a,b,c,d)=(0,A,B,C,D);
-            for(var j=0;j<64;j+=1){
+            for(var j=0;j<64;j+=1) {
                 f=functions[j](b,c,d);
                 (a,b,c,d)=(d,check(b+rol(a+f+K[j]+res[i+idx[j]],S[j])),b,c);
             }
@@ -173,7 +175,7 @@ var md5=func(){
 }();
 
 # check if md5 runs correctly
-var md5check=func(){
+var md5check = func() {
     var test_set=[
         "md5",
         "github.com",
@@ -200,9 +202,9 @@ var md5check=func(){
         "a7916c5ce54e73b7ddf6a286b36d976d",
         "ec6d5b197ba019db23c719112f3f70b7"
     ];
-    forindex(var i;test_set){
+    forindex(var i;test_set) {
         var res=md5(test_set[i]);
-        if(cmp(res,result[i]))
+        if (cmp(res,result[i]))
             println(
                 "md5 cannot work:\n",
                 "    test \""~test_set[i]~"\"\n",
diff --git a/test/md5compare.nas b/test/md5compare.nas
index 09a8ef1..5bf7f47 100644
--- a/test/md5compare.nas
+++ b/test/md5compare.nas
@@ -23,7 +23,7 @@ var compare = func() {
             }
             byte += size(s);
             var res = md5(s);
-            if(cmp(res, md5_self.md5(s))) {
+            if (cmp(res, md5_self.md5(s))) {
                 die("error: "~str(i));
             }
             if (i-begin-int((i-begin)/4)*4==0) {
@@ -79,7 +79,7 @@ var filechecksum = func() {
         var f = source[i];
         var res = md5(f);
         byte += size(f);
-        if(cmp(res, md5_self.md5(f))){
+        if (cmp(res, md5_self.md5(f))) {
             die("error: "~files[i]);
         }
         print(
@@ -98,7 +98,7 @@ var randomchecksum = func() {
     }
 }
 
-if(os.platform()=="windows") {
+if (os.platform()=="windows") {
     system("chcp 65001");
 }
 filechecksum();
diff --git a/test/module_test.nas b/test/module_test.nas
index 109ceda..58773c7 100644
--- a/test/module_test.nas
+++ b/test/module_test.nas
@@ -4,35 +4,35 @@ use module.libfib;
 println(keys(libfib));
 libfib.test_ghost();
 
-var libfib=func(){
+var libfib = func() {
     var (dd,fib,qfib)=(nil,nil,nil);
     var invoke=dylib.limitcall(1);
     return {
-        open:func(){
-            if(dd==nil){
+        open:func() {
+            if (dd==nil) {
                 dd=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
                 fib=dd.fib;
                 qfib=dd.quick_fib;
-            }else{
+            } else {
                 println("[info  ] already loaded.");
             }
         },
-        close:func(){
-            if(dd==nil){
+        close:func() {
+            if (dd==nil) {
                 println("[error ] already closed.");
                 return;
             }
             dylib.dlclose(dd.lib);
             (dd,fib,qfib)=(nil,nil,nil);
         },
-        fib:func(x){
-            if(fib!=nil)
+        fib:func(x) {
+            if (fib!=nil)
                 return invoke(fib,x);
             println("[error ] cannot call fib.");
             return nil;
         },
-        qfib:func(x){
-            if(qfib!=nil)
+        qfib:func(x) {
+            if (qfib!=nil)
                 return invoke(qfib,x);
             println("[error ] cannot call qfib.");
             return nil;
@@ -55,7 +55,7 @@ println("[result] ",libfib.fib(35));
 println("[result] ",libfib.qfib(35));
 libfib.close();
 
-var speed_test=func(){
+var speed_test = func() {
     var d=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
     println("[dylib ] ",d);
     var fd=d.quick_fib;
@@ -63,14 +63,14 @@ var speed_test=func(){
     var invoke=dylib.limitcall(1);
     var tm=maketimestamp();
 
-    for(var t=0;t<10;t+=1){
+    for(var t=0;t<10;t+=1) {
         tm.stamp();
-        for(var i=0;i<5e5;i+=1){
+        for(var i=0;i<5e5;i+=1) {
             invoke(fd,40);
         }
         println("[time  ] limited call: ",int(5e5/tm.elapsedMSec())," call/ms");
         tm.stamp();
-        for(var i=0;i<5e5;i+=1){
+        for(var i=0;i<5e5;i+=1) {
             vec_call(fd,40);
         }
         println("[time  ] dynamic call: ",int(5e5/tm.elapsedMSec())," call/ms");
diff --git a/test/nasal_test.nas b/test/nasal_test.nas
index 60f40dd..08bc563 100644
--- a/test/nasal_test.nas
+++ b/test/nasal_test.nas
@@ -2,13 +2,13 @@
 # Sidi Liang
 var w = 1;
 var x = "hello";
-var f = func(){
+var f = func() {
     println("f is called");
 }
-var f2 = func(){
+var f2 = func() {
     return 2;
 }
-var f3 = func(){
+var f3 = func() {
     return "numb";
 }
 var y = [w, x];
@@ -44,23 +44,23 @@ println(z.numb);                 #//1
 println(z.listt[2][1]);          #//hello
 println(z1.hashh.listt[2][1]);   #//hello
 println(y2[3].hashh.listt[2][1]);#//hello
-println(f);                      #//func(..){..}
+println(f);                      #//func(..) {..}
 f();                             #//f is called
-println(z.funcc);                #//func(..){..}
+println(z.funcc);                #//func(..) {..}
 z.funcc();                       #//f is called
-println(z.funcccall);            #//func(..){..}
+println(z.funcccall);            #//func(..) {..}
 z2.listt2[3].hashh.funcc();      #//f is called
 println(y1[f2()][w]);            #//hello
 println(true,' ',false);         #//1 0
 
 
 # ValKmjolnir
-func(){
+func() {
     var tm=maketimestamp();
     var duration=0;
-    var f1=func(){}
-    var f2=func(){var a=1;return a+1;}
-    var f3=func(){var (a,b)=(1,1);return a+b+1;}
+    var f1 = func() {}
+    var f2 = func() {var a=1;return a+1;}
+    var f3 = func() {var (a,b)=(1,1);return a+b+1;}
     tm.stamp();
     for(var i=0;i<1e6;i+=1);
     duration=tm.elapsedMSec();
@@ -70,7 +70,7 @@ func(){
     duration=tm.elapsedMSec();
     println(str(int(1e6/duration))," calc/ms");
     tm.stamp();
-    for(var i=0;i<1e6;i+=1)func{}();
+    for(var i=0;i<1e6;i+=1)func {}();
     duration=tm.elapsedMSec();
     println(str(int(1e6/duration))," calc/ms");
     tm.stamp();
@@ -79,7 +79,7 @@ func(){
     println(str(int(1e6/duration))," calc/ms");
     tm.stamp();
     for(var i=0;i<1e6;i+=1)
-        func{
+        func {
             var a=1;
             return a+1;
         }();
@@ -91,7 +91,7 @@ func(){
     println(str(int(1e6/duration))," calc/ms");
     tm.stamp();
     for(var i=0;i<1e6;i+=1)
-        func{
+        func {
             var (a,b)=(1,1);
             return a+b+1;
         }();
diff --git a/test/occupation.nas b/test/occupation.nas
index 99e5aa0..6cd2f93 100644
--- a/test/occupation.nas
+++ b/test/occupation.nas
@@ -1,3 +1,4 @@
+use std.coroutine;
 use std.process_bar;
 use module.libkey;
 use std.runtime;
@@ -5,12 +6,12 @@ use std.runtime;
 var is_windows_platform=os.platform()=="windows";
 var is_macos_platform=os.platform()=="macOS";
 
-if(is_windows_platform){
+if (is_windows_platform) {
     system("chcp 65001");
 }
 
-var cpu_stat=func(){
-    if(is_windows_platform or is_macos_platform)
+var cpu_stat = func() {
+    if (is_windows_platform or is_macos_platform)
         return nil;
     var cpu=split("\n",io.readfile("/proc/stat"))[0];
     cpu=split(" ",cpu);
@@ -27,21 +28,21 @@ var cpu_stat=func(){
     return cpu;
 }
 
-var cpu_occupation=func(){
+var cpu_occupation = func() {
     var first_in=1;
-    while(1){
+    while(1) {
         var cpu0=cpu_stat();
-        if(first_in){
+        if (first_in) {
             unix.sleep(0.1);
             first_in=0;
-        }else{
-            for(var i=0;i<10;i+=1){
+        } else {
+            for(var i=0;i<10;i+=1) {
                 unix.sleep(0.1);
                 coroutine.yield(nil);
             }
         }
         var cpu1=cpu_stat();
-        if(is_windows_platform or is_macos_platform){
+        if (is_windows_platform or is_macos_platform) {
             coroutine.yield(0);
             continue;
         }
@@ -52,12 +53,12 @@ var cpu_occupation=func(){
     }
 }
 
-var mem_occupation=func(){
-    if(is_windows_platform or is_macos_platform)
+var mem_occupation = func() {
+    if (is_windows_platform or is_macos_platform)
         return {MemTotal:math.inf,MemFree:math.inf};
     var meminfo=split("\n",io.readfile("/proc/meminfo"));
     var mem_res={};
-    forindex(var i;meminfo){
+    forindex(var i;meminfo) {
         var tmp=split(" ",meminfo[i])[0:1];
         tmp[0]=substr(tmp[0],0,size(tmp[0])-1);
         mem_res[tmp[0]]=num(tmp[1]);
@@ -65,33 +66,33 @@ var mem_occupation=func(){
     return mem_res;
 }
 
-var random_generator=func(){
+var random_generator = func() {
     var rise=[" ","▁","▂","▃","▄","▅","▆","▇","█"];
     var total=0;
     var statistics=[];
     setsize(statistics,70);
-    while(1){
-        for(var i=0;i<10;i+=1){
+    while(1) {
+        for(var i=0;i<10;i+=1) {
             total+=1;
             var u=rand()*rand()*(rand()>0.5?-1:1);
             statistics[int(size(statistics)/2+u*size(statistics)/2)]+=1;
         }
         var s=["","",""];
-        foreach(var st;statistics){
+        foreach(var st;statistics) {
             var max_rate=100/size(statistics);
             var rate=st/total*100;
-            for(var i=size(s)-1;i>=0;i-=1){
-                if(rate>=max_rate){
+            for(var i=size(s)-1;i>=0;i-=1) {
+                if (rate>=max_rate) {
                     s[i]~="█";
                     rate-=max_rate;
-                }else{
+                } else {
                     s[i]~=rise[rate/max_rate*size(rise)];
                     rate=0;
                 }
             }
         }
         var tmp="";
-        for(var i=0;i<size(statistics);i+=1){
+        for(var i=0;i<size(statistics);i+=1) {
             tmp~="-";
         }
         println("\e[16;1H \e[32m|",s[0],"|\e[0m");
@@ -102,11 +103,11 @@ var random_generator=func(){
     }
 }
 
-func(){
+func() {
     var limited_loop=(size(runtime.argv())!=0 and !math.isnan(num(runtime.argv()[0])));
-    if(limited_loop){
+    if (limited_loop) {
         limited_loop=num(runtime.argv()[0]);
-    }else{
+    } else {
         limited_loop=-1;
     }
 
@@ -122,28 +123,28 @@ func(){
 
     var bar=process_bar.high_resolution_bar(48);
     print("\ec");
-    while(limited_loop!=0){
+    while(limited_loop!=0) {
         limited_loop=limited_loop<0?limited_loop:limited_loop-1;
         var mem=mem_occupation();
         var mem_occ=(mem.MemTotal-mem.MemFree)/mem.MemTotal*100;
-        if(math.isnan(mem_occ) or mem_occ<0 or mem_occ>100){
+        if (math.isnan(mem_occ) or mem_occ<0 or mem_occ>100) {
             mem_occ=0;
         }
         var cpu_occ=nil;
-        while((cpu_occ=coroutine.resume(co)[0])==nil){
+        while((cpu_occ=coroutine.resume(co)[0])==nil) {
             var key=libkey.nonblock();
             coroutine.resume(rd);
-            if(key!=nil and chr(key)=="q")
+            if (key!=nil and chr(key)=="q")
                 return;
         }
 
-        if(is_windows_platform or is_macos_platform){
+        if (is_windows_platform or is_macos_platform) {
             # sorry this is not real data
             cpu_occ=rand()*10;
             mem_occ=rand()*10+40;
         }
 
-        for(var i=0;i<size(cpu_occupation_log)-1;i+=1){
+        for(var i=0;i<size(cpu_occupation_log)-1;i+=1) {
             cpu_occupation_log[i]=cpu_occupation_log[i+1];
             mem_occupation_log[i]=mem_occupation_log[i+1];
         }
@@ -158,19 +159,19 @@ func(){
         println("\e[6;1H\e[1m CPU occupation(%)   : \e[0m",cpu_occ>90?"\e[91m":"\e[32m",bar.bar(cpu_occ/100)~" ",cpu_occ,"\e[0m         ");
 
         var tmp="";
-        for(var i=0;i<70;i+=1){
+        for(var i=0;i<70;i+=1) {
             tmp~="-";
         }
 
         var s=["","",""];
-        foreach(var occ;cpu_occupation_log){
+        foreach(var occ;cpu_occupation_log) {
             var max_rate=50/size(s);
             var rate=occ;
-            for(var i=size(s)-1;i>=0;i-=1){
-                if(rate>=max_rate){
+            for(var i=size(s)-1;i>=0;i-=1) {
+                if (rate>=max_rate) {
                     s[i]~="█";
                     rate-=max_rate;
-                }else{
+                } else {
                     s[i]~=rise[rate/max_rate*size(rise)];
                     rate=0;
                 }
@@ -183,14 +184,14 @@ func(){
         println("\e[11;1H \e[32m+"~tmp~"+\e[0m");
 
         var s=["","",""];
-        foreach(var occ;mem_occupation_log){
+        foreach(var occ;mem_occupation_log) {
             var max_rate=100/size(s);
             var rate=occ;
-            for(var i=size(s)-1;i>=0;i-=1){
-                if(rate>=max_rate){
+            for(var i=size(s)-1;i>=0;i-=1) {
+                if (rate>=max_rate) {
                     s[i]~="█";
                     rate-=max_rate;
-                }else{
+                } else {
                     s[i]~=rise[rate/max_rate*size(rise)];
                     rate=0;
                 }
diff --git a/test/prime.nas b/test/prime.nas
index 7f179d1..50f6b82 100644
--- a/test/prime.nas
+++ b/test/prime.nas
@@ -1,25 +1,25 @@
-var is_prime=func(x){
+var is_prime = func(x) {
     for(var i=2;i<x;i+=1)
-        if(x/i==int(x/i))
+        if (x/i==int(x/i))
             return 0;
     return 1;
 }
 
-var is_prime_sqrt=func(x){
+var is_prime_sqrt = func(x) {
     for(var i=2;i<=math.sqrt(x);i+=1)
-        if(x/i==int(x/i))
+        if (x/i==int(x/i))
             return 0;
     return 1;
 }
 
 var primes=[];
-var filter=func(x){
-    foreach(var i;primes){
-        if(x/i==int(x/i))
+var filter = func(x) {
+    foreach(var i;primes) {
+        if (x/i==int(x/i))
             return 0;
-        if(x>=i){
+        if (x>=i) {
             for(var j=i+1;j<=math.sqrt(x);j+=1)
-                if(x/j==int(x/j))
+                if (x/j==int(x/j))
                     return 0;
             append(primes,x);
             return 1;
@@ -29,10 +29,10 @@ var filter=func(x){
     return 1;
 }
 
-func(){
+func() {
     var cnt=0;
     for(var i=2;i<50000;i+=1)
-        if(filter(i))
+        if (filter(i))
             cnt+=1;
     println(cnt);
 }();
diff --git a/test/qrcode.nas b/test/qrcode.nas
index b1e0f38..3b4c4c1 100644
--- a/test/qrcode.nas
+++ b/test/qrcode.nas
@@ -31,10 +31,10 @@ var code=[
 ];
 
 # enable unicode
-if(os.platform()=="windows")
+if (os.platform()=="windows")
     system("chcp 65001");
 var texture=["  ","██"];
-for(var i=0;i<size(code);i+=1){
+for(var i=0;i<size(code);i+=1) {
     for(var j=0;j<size(code[i]);j+=1)
         print(texture[code[i][j]]);
     print('\n');
diff --git a/test/quick_sort.nas b/test/quick_sort.nas
index af10a5f..a4cca7d 100644
--- a/test/quick_sort.nas
+++ b/test/quick_sort.nas
@@ -1,12 +1,12 @@
 
-var var_sort=func(){
+var var_sort = func() {
     srand(); # be aware! this causes global changes
-    var quick_sort_core=func(vec,left,right){
-        if(left>=right) return nil;
+    var quick_sort_core = func(vec,left,right) {
+        if (left>=right) return nil;
         var base=left+int(rand()*(right-left));
         (vec[left],vec[base])=(vec[base],vec[left]);
         var (i,j,tmp)=(left,right,vec[left]);
-        while(i<j){
+        while(i<j) {
             while(i<j and tmp<vec[j])
                 j-=1;
             vec[i]=vec[j];
@@ -20,7 +20,7 @@ var var_sort=func(){
         quick_sort_core(vec,i+1,right);
         return nil;
     }
-    return func(vec){
+    return func(vec) {
         quick_sort_core(vec,0,size(vec)-1);
         return nil;
     }
@@ -38,10 +38,10 @@ for(var i=1;i<1e4;i+=1) {
     }
 }
 
-var test=func(n){
+var test = func(n) {
     var a=[];
     setsize(a,n);
-    for(var i=0;i<n;i+=1){
+    for(var i=0;i<n;i+=1) {
         a[i]=int(rand()*n);
     }
     var ts=maketimestamp();
@@ -51,7 +51,7 @@ var test=func(n){
 
     var a=[];
     setsize(a,n);
-    for(var i=0;i<n;i+=1){
+    for(var i=0;i<n;i+=1) {
         a[i]=int(rand()*n);
     }
     ts.stamp();
@@ -59,6 +59,6 @@ var test=func(n){
     println("[time] ",str(n)," in ",ts.elapsedMSec()/1000," sec (lambda cmp)");
 }
 
-for(var i=1000;i<1e6;i*=10){
+for(var i=1000;i<1e6;i*=10) {
     test(i);
 }
\ No newline at end of file
diff --git a/test/sample.nas b/test/sample.nas
index 53d2f10..df532a4 100644
--- a/test/sample.nas
+++ b/test/sample.nas
@@ -99,7 +99,7 @@ var innerFunc = func {
 # what the ?: does in C.  The last semicolon in a code block is
 # optional, to make this prettier.
 #
-var abs = func(n) { if(n<0) { -n } else { n } }
+var abs = func(n) { if (n<0) { -n } else { n } }
 
 #
 # But for those who don't like typing, the ternary operator works like
@@ -119,7 +119,7 @@ var listNode = { data : ["what", "ever"], next : nil };
 #
 var toggle = 0;
 var a = nil;
-if(a and a.field == 42) {
+if (a and a.field == 42) {
     toggle = !toggle; # doesn't crash when a is nil
 }
 
@@ -213,8 +213,8 @@ for(var i=0; i<size(string); i+=1) { ascii_sum += string[i]; }
 #
 # You can use backquotes to write UTF8 character constants
 #
-if(`A` != 65) { print("ASCII violation bug!\n"); }
-if(`©` != 169) { print("Unicode violation bug!\n"); }
+if (`A` != 65) { print("ASCII violation bug!\n"); }
+if (`©` != 169) { print("Unicode violation bug!\n"); }
 
 #
 # And you can mutate strings by assigning to their indices, as long as
@@ -225,7 +225,7 @@ if(`©` != 169) { print("Unicode violation bug!\n"); }
 var ascii_lc = func(string) {
     var mutable = string ~ "";
     for(var i=0; i<size(mutable); i+=1) {
-        if(mutable[i] >= `A` and mutable[i] <= `Z`) {
+        if (mutable[i] >= `A` and mutable[i] <= `Z`) {
             mutable[i] += (`a` - `A`);
         }
     }
@@ -290,9 +290,9 @@ var completelyDone = dummyFunc;
 for(#OUTER;
     var i=0; i<100; i = i+1) {
     for(var j=0; j<100; j = j+1) {
-        if(doneWithInnerLoopEarly()) {
+        if (doneWithInnerLoopEarly()) {
             break;
-        } elsif(completelyDone()) {
+        } elsif (completelyDone()) {
             break #OUTER;
         }
     }
@@ -308,21 +308,21 @@ for(#OUTER;
 ##
 var dump = func(o) {
     var result = "";
-    if(typeof(o) == "scalar") {
+    if (typeof(o) == "scalar") {
         var n = num(o);
-        if(n == nil) { result = result ~ '"' ~ o ~ '"'; }
+        if (n == nil) { result = result ~ '"' ~ o ~ '"'; }
         else { result = result ~ o; }
-    } elsif(typeof(o) == "vector") {
+    } elsif (typeof(o) == "vector") {
         result = result ~ "[ ";
-        if(size(o) > 0) { result = result ~ dump(o[0]); }
+        if (size(o) > 0) { result = result ~ dump(o[0]); }
         for(i=1; i<size(o); i=i+1) {
             result = result ~ ", " ~ dump(o[i]);
         }
         result = result ~ " ]";
-    } elsif(typeof(o) == "hash") {
+    } elsif (typeof(o) == "hash") {
         var ks = keys(o);
         result = result ~ "{ ";
-        if(size(o) > 0) {
+        if (size(o) > 0) {
             var k = ks[0];
             result = result ~ k ~ ":" ~ dump(o[k]);
         }
@@ -348,7 +348,7 @@ var dump = func(o) {
 # normal function definition.  Oh well, every language has a syntactic
 # quirk or two...)
 #
-var a = (func(n){ n + 1 })(232);  # "a" now equals 233
+var a = (func(n) { n + 1 })(232);  # "a" now equals 233
 
 #
 # Functional programming B.  All expressions have a value, the last
@@ -357,7 +357,7 @@ var a = (func(n){ n + 1 })(232);  # "a" now equals 233
 # (assignment, duh) have side effects.  e.g. The "if" expression works
 # both for code flow and as the ?: expression in C/C++.
 #
-var factorial = func(n) { if(n == 0) { 1 }
+var factorial = func(n) { if (n == 0) { 1 }
                       else       { n * factorial(n-1) } }
 print(factorial(10), "\n");
 
diff --git a/test/scalar.nas b/test/scalar.nas
index e2c9feb..6e16ef1 100644
--- a/test/scalar.nas
+++ b/test/scalar.nas
@@ -55,19 +55,19 @@ var hash_4={
 };
 
 # function
-var func_1=func(){return 1;}
-var prt=func(x){println(x);return nil;}
-var func_with_dynamic_id=func(a,b,c,d...){return [a,b,c,d];}
-var func_with_lack_para=func(a,b,c=1,d=2){return a+b+c+d;}
-var func_with_func_para=func(a,f){return f(a);}
+var func_1 = func() {return 1;}
+var prt = func(x) {println(x);return nil;}
+var func_with_dynamic_id = func(a,b,c,d...) {return [a,b,c,d];}
+var func_with_lack_para = func(a,b,c=1,d=2) {return a+b+c+d;}
+var func_with_func_para = func(a,f) {return f(a);}
 
 func_with_lack_para(a:1, b:2, c:3, d:4);
 func_with_lack_para(b:1, c:3, a:4, d:1);
 func_with_func_para(f:func prt,a:1);
-func_with_func_para(func func_1(),func(x){return x;});
+func_with_func_para(func func_1(),func(x) {return x;});
 func_with_func_para(func_1(),func_1);
 prt(func func_1());
-var test_func_ret_number_1=func func_1(); # 1
+var test_func_ret_number_1 = func func_1(); # 1
 var test_func_ret_number_2=func_1();      # 1
 
 var source={
@@ -77,7 +77,7 @@ var source={
 println(source['member_2']());
 println(source.member_2());
 
-var test_func=func{return 1;}
+var test_func = func {return 1;}
 println(func test_func());       # 1
 println(test_func());            # 1
 println(func test_func);         # nothing
@@ -87,9 +87,9 @@ println(({str:"what?"})["str"]); # what?
 println(({str:"what?"}).str);    # what?
 
 # lambda
-(func(x){return x>0? x:0;})(12);
-(func{println("hello world");})();
-(((func(x){return 1.0/math.exp(x);})))(0);
+(func(x) {return x>0? x:0;})(12);
+(func {println("hello world");})();
+(((func(x) {return 1.0/math.exp(x);})))(0);
 
 # flexible definition & assignment
 var (r,g,b)=[0x00,0x10,0xff];
@@ -127,7 +127,7 @@ nil and 1+7*8;
 {num:0}.num or {what_is_the_secret_of_universe:42}["what_is_the_secret_of_universe"];
 "123"~"456"-123456*2/2;
 
-var hash={str:'hello',f:func{return me.str;}};
+var hash={str:'hello',f:func {return me.str;}};
 var tmp_f=hash.f;
 hash=1;
 println(tmp_f());
@@ -136,16 +136,16 @@ println(tmp_f());
 # when generating local_scope for function f,
 # nasal_gc will not count 'me' as one reference of this hash
 
-var h1={str:'hello',f:func{return me.str;}};
-var h2={str:'world',f:func{return nil;}};
+var h1={str:'hello',f:func {return me.str;}};
+var h2={str:'world',f:func {return nil;}};
 h2.f=h1.f;
 println(h2.f());
 # print 'world'
 # this means that 'me' in hash's functions
 # only points to the hash this function belongs to
 
-var f1=func(){println(1);return 1;}
-var f2=func(){println(2);return 0;}
+var f1 = func() {println(1);return 1;}
+var f2 = func() {println(2);return 0;}
 f1() or f2();
 # print '1'
 # this means that when using 'or' or 'and',
@@ -158,12 +158,12 @@ print(
     abs(1),'\n',
     abs(-1),'\n',
     systime(),'\n',
-    isfunc(func{}),' ',isfunc([]),'\n',
+    isfunc(func {}),' ',isfunc([]),'\n',
     ishash({}),' ',ishash([]),'\n',
     isint(114.514),' ',isint(114514),'\n',
     isnum("0xaa55"),' ',isnum("?"),'\n',
     isscalar(0.618),' ',isscalar("hello"),' ',isscalar([]),'\n',
-    isstr("hello"),' ',isstr(func{}),'\n',
+    isstr("hello"),' ',isstr(func {}),'\n',
     isvec([]),' ',isvec("[]"),'\n',
     vecindex([0,1,2,3,4],1),'\n',
     vecindex(["apple","banana"],"apple")!=nil,'\n'
@@ -179,13 +179,13 @@ println(find("x", "abcdef"));  # prints -1
 println(find("cd", "abcdef")); # prints 2
 
 var a={
-    new: func(x=0){
+    new: func(x=0) {
         return {
             x:x,
             parents:[a]
         };
     },
-    new2: func(x=0){
+    new2: func(x=0) {
         return {
             x:x,
             parents:a
@@ -195,17 +195,17 @@ var a={
 println(isa(a.new(),a)); # 1
 println(isa(a.new2(),a));# 0
 
-var a=[10,-10,0,1,2,3,nil,"string","hello",[],[0,1,2,3],{},{a:0,b:1,c:2},func{}];
+var a=[10,-10,0,1,2,3,nil,"string","hello",[],[0,1,2,3],{},{a:0,b:1,c:2},func {}];
 println("type\tsize\tnum\tsrc");
-foreach(var i;a){
+foreach(var i;a) {
     println(typeof(i),'\t',size(i),'\t',num(i),'\t',i);
 }
-foreach(i;a){
+foreach(i;a) {
     ;
 }
 println(runtime.argv());
 println(globals.arg);
-func(a,b,c,d="只有红茶可以吗"){
+func(a,b,c,d="只有红茶可以吗") {
     println(a,' ',b,' ',c,' ',d,' true: ',true,' false: ',false);
 }(c:1919810,b:514,a:114);
 
@@ -220,7 +220,7 @@ var h=split(" ","0 1 2 3 4 5 6 7 8 9 a b c d e f");
 for(var a=0;a<16;a+=1) {
     for(var b=0;b<16;b+=1) {
         for(var c=0;c<16;c+=1) {
-            if(((a^b)&c)!=(a^(b&c))) {
+            if (((a^b)&c)!=(a^(b&c))) {
                 println("0x"~h[a],"^","0x"~h[b],"&","0x"~h[c]," -> a^b&c = 0x",h[a^b&c]," (a^b)&c = 0x",h[(a^b)&c]," a^(b&c) = 0x",h[(a^(b&c))]);
             }
         }
diff --git a/test/snake.nas b/test/snake.nas
index 27babbb..dec06ff 100644
--- a/test/snake.nas
+++ b/test/snake.nas
@@ -1,13 +1,14 @@
 use module.libkey;
 use std.list;
 use std.runtime;
+use std.coroutine;
 
-var game=func(x,y){
+var game = func(x,y) {
     rand(time(0));
     var texture=["  ","██","\e[91m██\e[0m"];
     var edge0="╔";
     var edge1="╚";
-    for(var i=0;i<x;i+=1){
+    for(var i=0;i<x;i+=1) {
         edge0~="══";
         edge1~="══";
     }
@@ -16,7 +17,7 @@ var game=func(x,y){
 
     var vec=[];
     setsize(vec,x);
-    for(var i=0;i<x;i+=1){
+    for(var i=0;i<x;i+=1) {
         vec[i]=[];
         setsize(vec[i],y);
         for(var j=0;j<y;j+=1)
@@ -31,7 +32,7 @@ var game=func(x,y){
 
     var move='w';
     var gameover=0;
-    var setapple=func(){
+    var setapple = func() {
         var (cord_x,cord_y)=(int(rand()*x),int(rand()*y));
         while(vec[cord_x][cord_y]!=0)
             (cord_x,cord_y)=(int(rand()*x),int(rand()*y));
@@ -40,13 +41,13 @@ var game=func(x,y){
     setapple();
 
     return {
-        print:func(){
+        print:func() {
             var s="";
             var (fx,fy)=snake.front();
-            for(var i=0;i<y;i+=1){
+            for(var i=0;i<y;i+=1) {
                 s~="║";
-                for(var j=0;j<x;j+=1){
-                    if(fx==j and fy==i)
+                for(var j=0;j<x;j+=1) {
+                    if (fx==j and fy==i)
                         s~="\e[93m"~texture[vec[j][i]]~"\e[0m";
                     else
                         s~=texture[vec[j][i]];
@@ -55,66 +56,66 @@ var game=func(x,y){
             }
             print('\e[1;1H'~edge0~s~edge1);
         },
-        next:func(){
+        next:func() {
             var (fx,fy)=snake.front();
             var eat=0;
-            if(move=="w" and fy-1>=0){
+            if (move=="w" and fy-1>=0) {
                 snake.push_front([fx,fy-1]);
-                if(vec[fx][fy-1]==1)
+                if (vec[fx][fy-1]==1)
                     gameover=1;
-                elsif(vec[fx][fy-1]==2)
+                elsif (vec[fx][fy-1]==2)
                     eat=1;
                 vec[fx][fy-1]=1;
-            }elsif(move=='a' and fx-1>=0){
+            } elsif (move=='a' and fx-1>=0) {
                 snake.push_front([fx-1,fy]);
-                if(vec[fx-1][fy]==1)
+                if (vec[fx-1][fy]==1)
                     gameover=1;
-                elsif(vec[fx-1][fy]==2)
+                elsif (vec[fx-1][fy]==2)
                     eat=1;
                 vec[fx-1][fy]=1;
-            }elsif(move=='s' and fy+1<y){
+            } elsif (move=='s' and fy+1<y) {
                 snake.push_front([fx,fy+1]);
-                if(vec[fx][fy+1]==1)
+                if (vec[fx][fy+1]==1)
                     gameover=1;
-                elsif(vec[fx][fy+1]==2)
+                elsif (vec[fx][fy+1]==2)
                     eat=1;
                 vec[fx][fy+1]=1;
-            }elsif(move=='d' and fx+1<x){
+            } elsif (move=='d' and fx+1<x) {
                 snake.push_front([fx+1,fy]);
-                if(vec[fx+1][fy]==1)
+                if (vec[fx+1][fy]==1)
                     gameover=1;
-                elsif(vec[fx+1][fy]==2)
+                elsif (vec[fx+1][fy]==2)
                     eat=1;
                 vec[fx+1][fy]=1;
-            }else{
+            } else {
                 gameover=1;
             }
-            if(!gameover and !eat){
+            if (!gameover and !eat) {
                 var (bx,by)=snake.back();
                 vec[bx][by]=0;
                 snake.pop_back();
             }
 
-            if(eat and snake.length()!=x*y)
+            if (eat and snake.length()!=x*y)
                 setapple();
-            elsif(snake.length()==x*y)
+            elsif (snake.length()==x*y)
                 gameover=2;
         },
-        move:func(c){
+        move:func(c) {
             move=c;
         },
-        gameover:func(){
+        gameover:func() {
             return gameover;
         }
     }
 }
 
-var co=coroutine.create(func(){
-    while(1){
+var co=coroutine.create(func() {
+    while(1) {
         var moved=-1;
-        for(var i=0;i<30;i+=1){
+        for(var i=0;i<30;i+=1) {
             var ch=libkey.nonblock();
-            if(moved==-1 and ch!=nil){
+            if (moved==-1 and ch!=nil) {
                 moved=ch;
             }
             coroutine.yield(nil);
@@ -124,43 +125,44 @@ var co=coroutine.create(func(){
     }
 });
 
-var main=func(argv){
+var main = func(argv) {
     var should_skip=(size(argv)!=0 and argv[0]=="--skip");
     # enable unicode
-    if(os.platform()=="windows")
+    if (os.platform()=="windows")
         system("chcp 65001");
     print("\ec");
 
     var g=game(15,10);
     g.print();
     print("\rpress any key to start...");
-    if(!should_skip){
+    if (!should_skip) {
         libkey.getch();
     }
     print("\r                         \r");
     var counter=20;
-    while(1){
+    while(1) {
         while((var ch=coroutine.resume(co)[0])==nil);
-        if(ch!=nil and ch!=-1){
-            if(ch=='q'[0])
+        if (ch!=nil and ch!=-1) {
+            if (ch=='q'[0]) {
                 break;
-            elsif(ch=='p'[0]){
+            } elsif (ch=='p'[0]) {
                 print("\rpress any key to continue...");
                 libkey.getch();
                 print("\r                            \r");
+            } elsif (ch=='w'[0] or ch=='s'[0] or ch=='a'[0] or ch=='d'[0]) {
+                g.move(chr(ch));
             }
-            g.move(chr(ch));
         }
         
         g.next();
-        if(g.gameover())
+        if (g.gameover())
             break;
         g.print();
     }
 
     println(g.gameover()<=1?"game over.":"you win!");
     println("press 'q' to quit.");
-    if(should_skip){
+    if (should_skip) {
         return;
     }
     while(libkey.getch()!='q'[0]);
diff --git a/test/tetris.nas b/test/tetris.nas
index 0d8ccc9..50ebe74 100644
--- a/test/tetris.nas
+++ b/test/tetris.nas
@@ -60,8 +60,8 @@ var blockshape=[
 var color_count=0;
 var counter=0;
 var package=[0,1,2,3,4,5,6];
-var exchange=func(){
-    for(var i=6;i>=0;i-=1){
+var exchange = func() {
+    for(var i=6;i>=0;i-=1) {
         var index=int(i*rand());
         (package[i],package[index])=(package[index],package[i]);
     }
@@ -74,12 +74,12 @@ var block={
     type:nil,
     shape:nil,
     color:nil,
-    new:func(x=0,y=0){
+    new:func(x=0,y=0) {
         (me.x,me.y)=(x,y);
         me.rotate=0;
         me.type=blocktype[package[counter]];
         counter+=1;
-        if(counter==7){
+        if (counter==7) {
             exchange();
             counter=0;
         }
@@ -88,18 +88,18 @@ var block={
 
         me.color=color_count;
         color_count+=1;
-        if(color_count>=size(color))
+        if (color_count>=size(color))
             color_count=0;
         
         return {parents:[block]};
     }
 };
 
-var mapgen=func(mapx,mapy){
+var mapgen = func(mapx,mapy) {
     var (score,gameover)=(0,0);
     var (empty,unset,full)=(0,1,2);
 
-    if(mapx<1 or mapy<1)
+    if (mapx<1 or mapy<1)
         die("map_x or map_y must be greater than 1");
     
     # use in print
@@ -111,7 +111,7 @@ var mapgen=func(mapx,mapy){
 
     # generate new map
     var map=[];
-    for(var y=0;y<mapy;y+=1){
+    for(var y=0;y<mapy;y+=1) {
         var tmp=[];
         for(var x=0;x<mapx;x+=1)
             append(tmp,empty);
@@ -119,12 +119,12 @@ var mapgen=func(mapx,mapy){
     }
 
     var blk=nil;
-    var new_block=func(){
+    var new_block = func() {
         blk=block.new(int(mapx/2),0);
 
         # check if has enough place to place a new block
         foreach(var i;blk.shape)
-            if(map[blk.y+i[1]][blk.x+i[0]]>=full){
+            if (map[blk.y+i[1]][blk.x+i[0]]>=full) {
                 gameover=1;
                 return;
             }
@@ -135,17 +135,17 @@ var mapgen=func(mapx,mapy){
     new_block(); # initialize the first block
 
     # color print
-    var map_print=func(){
+    var map_print = func() {
         var s="\e[1;1H"~head;
-        for(var y=0;y<mapy;y+=1){
+        for(var y=0;y<mapy;y+=1) {
             s~="\e[32m║\e[0m";
-            for(var x=0;x<mapx;x+=1){
+            for(var x=0;x<mapx;x+=1) {
                 var c=map[y][x];
-                if(c==empty)
+                if (c==empty)
                     s~="  ";
-                elsif(c==unset)
+                elsif (c==unset)
                     s~=color[blk.color]~"██\e[0m";
-                elsif(c>=full)
+                elsif (c>=full)
                     s~=color[c-full]~"██\e[0m";
             }
             s~="\e[32m║\e[0m\n";
@@ -154,12 +154,12 @@ var mapgen=func(mapx,mapy){
         print(s,"\e[31ms\e[32mc\e[33mo\e[34mr\e[35me\e[36m: \e[0m",score,'\n');
     }
 
-    var moveleft=func(){
+    var moveleft = func() {
         var (x,y)=(blk.x-1,blk.y);
-        foreach(var i;blk.shape){
-            if(x+i[0]<0)
+        foreach(var i;blk.shape) {
+            if (x+i[0]<0)
                 return;
-            if(map[y+i[1]][x+i[0]]>=full)
+            if (map[y+i[1]][x+i[0]]>=full)
                 return;
         }
         # update block state and map
@@ -171,12 +171,12 @@ var mapgen=func(mapx,mapy){
         map_print();
     }
 
-    var moveright=func(){
+    var moveright = func() {
         var (x,y)=(blk.x+1,blk.y);
-        foreach(var i;blk.shape){
-            if(x+i[0]>=mapx)
+        foreach(var i;blk.shape) {
+            if (x+i[0]>=mapx)
                 return;
-            if(map[y+i[1]][x+i[0]]>=full)
+            if (map[y+i[1]][x+i[0]]>=full)
                 return;
         }
         # update block state and map
@@ -188,14 +188,14 @@ var mapgen=func(mapx,mapy){
         map_print();
     }
 
-    var rotate=func(){
+    var rotate = func() {
         var (r,x,y)=(blk.rotate,blk.x,blk.y);
         r=(r+1>=size(blk.type))?0:r+1;
         var shape=blockshape[blk.type[r]];
-        foreach(var i;shape){
-            if(x+i[0]>=mapx or x+i[0]<0 or y+i[1]>=mapy or y+i[1]<0)
+        foreach(var i;shape) {
+            if (x+i[0]>=mapx or x+i[0]<0 or y+i[1]>=mapy or y+i[1]<0)
                 return;
-            if(map[y+i[1]][x+i[0]]>=full)
+            if (map[y+i[1]][x+i[0]]>=full)
                 return;
         }
 
@@ -209,17 +209,17 @@ var mapgen=func(mapx,mapy){
         map_print();
     }
 
-    var fall=func(){
+    var fall = func() {
         var (x,y)=(blk.x,blk.y+1);
         # check if falls to the edge of other blocks or map
         var sethere=0;
         foreach(var i;blk.shape)
-            if(y+i[1]>=mapy or map[y+i[1]][x+i[0]]>=full){
+            if (y+i[1]>=mapy or map[y+i[1]][x+i[0]]>=full) {
                 sethere=1;
                 break;
             }
         # set block here and generate a new block
-        if(sethere){
+        if (sethere) {
             foreach(var i;blk.shape)
                 map[blk.y+i[1]][blk.x+i[0]]=blk.color+full;
             checkmap();
@@ -236,19 +236,19 @@ var mapgen=func(mapx,mapy){
         map_print();
     }
 
-    var checkmap=func(){
+    var checkmap = func() {
         var lines=1;
-        for(var y=mapy-1;y>=0;y-=1){
+        for(var y=mapy-1;y>=0;y-=1) {
             # check if this line is full of blocks
             var tmp=0;
-            for(var x=0;x<mapx;x+=1){
-                if(map[y][x]<full)
+            for(var x=0;x<mapx;x+=1) {
+                if (map[y][x]<full)
                     break;
                 tmp+=map[y][x];
             }
             # if is full, clear this line and
             # all the lines above fall one block
-            if(x==mapx){
+            if (x==mapx) {
                 score+=lines*tmp;
                 lines*=2;
                 for(var t=y;t>=1;t-=1)
@@ -268,15 +268,15 @@ var mapgen=func(mapx,mapy){
         rotate:rotate,
         fall:fall,
         checkmap:checkmap,
-        gameover:func(){return gameover;}
+        gameover:func() {return gameover;}
     };
 }
 
-var main=func(argv){
+var main = func(argv) {
     var should_skip=(size(argv)!=0 and argv[0]=="--skip");
     var init_counter=should_skip?5:30;
     # windows use chcp 65001 to output unicode
-    if(os.platform()=="windows")
+    if (os.platform()=="windows")
         system("chcp 65001");
     
     print(
@@ -296,41 +296,41 @@ var main=func(argv){
     exchange();
     var map=mapgen(mapx:12,mapy:18);
 
-    if(!should_skip){
+    if (!should_skip) {
         libkey.getch();
     }
     print("\ec");
     map.print();
 
     var counter=init_counter;
-    while(1){
+    while(1) {
         # nonblock input one character
         var ch=libkey.nonblock();
-        if(ch){
-            if(ch=='a'[0])     # move left
+        if (ch) {
+            if (ch=='a'[0])     # move left
                 map.moveleft();
-            elsif(ch=='d'[0])  # move right
+            elsif (ch=='d'[0])  # move right
                 map.moveright();
-            elsif(ch=='w'[0])  # rotate
+            elsif (ch=='w'[0])  # rotate
                 map.rotate();
-            elsif(ch=='s'[0])  # move down
+            elsif (ch=='s'[0])  # move down
                 map.fall();
-            elsif(ch=='q'[0])  # quit the game
+            elsif (ch=='q'[0])  # quit the game
                 break;
-            if(ch=='p'[0]){    # pause the game
+            if (ch=='p'[0]) {    # pause the game
                 print("\rpress any key to continue...");
                 libkey.getch();
                 print("\r                            ");
             }
             map.checkmap();
-            if(map.gameover())
+            if (map.gameover())
                 break;
         }
-        if(!counter){
+        if (!counter) {
             # automatically fall one block and check
             map.fall();
             map.checkmap();
-            if(map.gameover())
+            if (map.gameover())
                 break;
             counter=init_counter;
         }
@@ -348,7 +348,7 @@ var main=func(argv){
         "\e[36m'\e[94mq\e[95m' ",
         "\e[35mt\e[36mo \e[94mq\e[95mu\e[91mi\e[92mt\e[0m\n"
     );
-    if(!should_skip){
+    if (!should_skip) {
         while(libkey.getch()!='q'[0]);
     }
 };
diff --git a/test/trait.nas b/test/trait.nas
index 5bda73d..5e0224b 100644
--- a/test/trait.nas
+++ b/test/trait.nas
@@ -1,11 +1,11 @@
 
 var trait={
-    get:func{return me.val;},
-    set:func(x){me.val=x;}
+    get:func {return me.val;},
+    set:func(x) {me.val=x;}
 };
 
 var class={
-    new:func(){
+    new:func() {
         return {
             val:nil,
             parents:[trait]
@@ -14,25 +14,25 @@ var class={
 };
 
 var class2={
-    new:func(){
+    new:func() {
         return {
             val:nil,
             parents:[trait],
-            set:func(x){me.val=typeof(x);}
+            set:func(x) {me.val=typeof(x);}
         };
     }
 };
 
 var class_obj=[];
-for(var i=0;i<10;i+=1){
+for(var i=0;i<10;i+=1) {
     append(class_obj,class.new());
     class_obj[i].set(i);
 }
-for(var i=0;i<10;i+=1){
+for(var i=0;i<10;i+=1) {
     append(class_obj,class2.new());
     class_obj[10+i].set(i);
 }
 
-foreach(var object;class_obj){
+foreach(var object;class_obj) {
     println(object.get(),' ',keys(object));
 }
\ No newline at end of file
diff --git a/test/turingmachine.nas b/test/turingmachine.nas
index 95dea5d..e3ac15f 100644
--- a/test/turingmachine.nas
+++ b/test/turingmachine.nas
@@ -8,8 +8,8 @@ var table=[
 ];
 
 var operand={
-    new:func(symbol,changed_symbol,move,next_state){
-        if(move!='L' and move!='R' and move!='S')
+    new:func(symbol,changed_symbol,move,next_state) {
+        if (move!='L' and move!='R' and move!='S')
             die("invalid move type:"+move);
         return {
             symbol:symbol,
@@ -22,27 +22,27 @@ var operand={
 
 var machine={
     states:{},
-    add:func(state,operand){
-        if(!contains(me.states,state))
+    add:func(state,operand) {
+        if (!contains(me.states,state))
             me.states[state]=[operand];
-        else{
+        else {
             foreach(var i;me.states[state])
-                if(i.symbol==operand.symbol or i.symbol==nil){
+                if (i.symbol==operand.symbol or i.symbol==nil) {
                     println(i);
                     die("conflict operand");
                 }
             append(me.states[state],operand);
         }
     },
-    load:func(data){
-        foreach(var opr;data){
+    load:func(data) {
+        foreach(var opr;data) {
             var (nstat,sym,csym,move,nextstat)=opr;
             me.add(nstat,operand.new(sym,csym,move,nextstat));
         }
     }
 };
 
-var prt=func(state,pointer,paper,act=nil){
+var prt = func(state,pointer,paper,act=nil) {
     print(act!=nil?act:'','\n\t');
     var s='';
     foreach(var i;paper)
@@ -53,43 +53,43 @@ var prt=func(state,pointer,paper,act=nil){
             s~=' ';
     print(s,'^\n',state," ");
 }
-var run=func(table,start,stop){
+var run = func(table,start,stop) {
     var paper=['0','1','1','1','0','1','0','a'];
     var pointer=0;
 
     machine.load(table);
 
     print("states: ",keys(machine.states),'\n');
-    if(!contains(machine.states,start))
+    if (!contains(machine.states,start))
         die(start~" is not a valid node");
-    if(!contains(machine.states,stop))
+    if (!contains(machine.states,stop))
         die(stop~" is not a valid node");
     
     var (state,pointer)=(start,0);
 
     prt(state,pointer,paper);
-    while(state!=stop){
-        if(!contains(machine.states,state))
+    while(state!=stop) {
+        if (!contains(machine.states,state))
             die("no matching function for state:"~state);
         var found=0;
-        foreach(var action;machine.states[state]){
+        foreach(var action;machine.states[state]) {
             var (sym,csym,move,next)=(
                 action.symbol,
                 action.changed_symbol,
                 action.move,
                 action.next_state
             );
-            if(sym==paper[pointer] or sym==nil){
-                if(sym!=nil)
+            if (sym==paper[pointer] or sym==nil) {
+                if (sym!=nil)
                     paper[pointer]=csym;
-                if(move=='L') pointer-=1;
-                elsif(move=='R') pointer+=1;
+                if (move=='L') pointer-=1;
+                elsif (move=='R') pointer+=1;
                 (state,found)=(next,1);
                 break;
             }
         }
 
-        if(!found)
+        if (!found)
             die("no matching function for state:"~state);
 
         prt(state,pointer,paper,[sym,csym,move,next]);
diff --git a/test/utf8chk.nas b/test/utf8chk.nas
index 37ee852..ff2b445 100644
--- a/test/utf8chk.nas
+++ b/test/utf8chk.nas
@@ -1,4 +1,4 @@
-var unicode测试=func(){
+var unicode测试 = func() {
     var 输出=print;
     var 测试成功=[
         "unicode: utf-8支持测试成功",
@@ -9,7 +9,7 @@ var unicode测试=func(){
         输出(内容~"\n");
 }
 
-var emoji测试=func(){
+var emoji测试 = func() {
     var 💻=print;
     var 🎤="\n";
     var 🤣="🤣 笑嘻了";
@@ -47,21 +47,21 @@ var emoji测试=func(){
         💻(📄,🗄️[📄],🎤);
 }
 
-var dotsgen=func(){
+var dotsgen = func() {
     var dots=[];
     var s="⠀";
-    for(var i=0;i<256;i+=1){
+    for(var i=0;i<256;i+=1) {
         var v0=s[0];
         var v1=s[1]+int(i/64);
         var v2=s[2]+i;
-        if(v2>191){
+        if (v2>191) {
             v2-=int(i/64)*64;
         }
         var tmp=char(v0)~char(v1)~char(v2);
         append(dots,tmp);
     }
 
-    forindex(var i;dots){
+    forindex(var i;dots) {
         print(dots[i],(i+1-int((i+1)/32)*32==0)?"\n":"");
     }
     return dots;
diff --git a/test/watchdog.nas b/test/watchdog.nas
index f89c59a..1cb53a0 100644
--- a/test/watchdog.nas
+++ b/test/watchdog.nas
@@ -1,50 +1,50 @@
 use std.runtime;
 
-var os_time=func(){
+var os_time = func() {
     return "[\e[33;1m"~os.time()~"\e[0m] ";
 }
-var err_hd=func(){
+var err_hd = func() {
     return "[\e[91;1merror\e[0m] ";
 }
-var info_hd=func(){
+var info_hd = func() {
     return "[\e[96;1minfo\e[0m] ";
 }
-var modified_hd=func(){
+var modified_hd = func() {
     return "[\e[92;1mmodified\e[0m] ";
 }
-var usage=func(){
+var usage = func() {
     println(os_time(),info_hd(),"\e[1musage: nasal watchdog.nas <filename> [\"argv\"]\e[0m");
 }
 
 var argv=runtime.argv();
-if(size(argv)<1){
+if (size(argv)<1) {
     println(os_time(),err_hd(),"\e[1mneed correct file path to watch\e[0m");
     usage();
     exit(-1);
 }
 var filename=argv[0];
-if(!io.exists(filename)){
+if (!io.exists(filename)) {
     println(os_time(),err_hd(),"\e[1mfile <",filename,"> does not exist\e[0m");
     usage();
     exit(-1);
 }
 
 var args=[];
-if(size(argv)==2){
+if (size(argv)==2) {
     println(os_time(),info_hd(),"\e[1mwith argument(s) ",argv[1],"\e[0m");
     args=split(" ",argv[1]);
 }
 
 var modified_time=fstat(filename).st_mtime;
 println(os_time(),info_hd(),"\e[1mwatching ",filename," ..\e[0m");
-while(1){
+while(1) {
     unix.sleep(1);
-    if(!io.exists(filename)){
+    if (!io.exists(filename)) {
         println(os_time(),err_hd(),"\e[1mfile <",filename,"> does not exist\e[0m");
         break;
     }
     var latest_modified_time=fstat(filename).st_mtime;
-    if(latest_modified_time!=modified_time){
+    if (latest_modified_time!=modified_time) {
         modified_time=latest_modified_time;
         println(os_time(),modified_hd(),"\e[1m",filename,"\e[0m");
         var cmd=(os.platform()=="windows"?"":"./")~"nasal "~filename;
@@ -52,9 +52,9 @@ while(1){
             cmd~=" "~i;
         println(os_time(),info_hd(),"\e[1mexecuting command \"",cmd,"\"\e[0m");
         var ret=system(cmd);
-        if(ret!=0){
+        if (ret!=0) {
             println(os_time(),err_hd(),"\e[1mprocess returned ",ret,"\e[0m");
-        }else{
+        } else {
             println(os_time(),info_hd(),"\e[1mprocess returned ",ret,"\e[0m");
         }
     }
diff --git a/test/wavecollapse.nas b/test/wavecollapse.nas
index 556f9e3..1cdbf90 100644
--- a/test/wavecollapse.nas
+++ b/test/wavecollapse.nas
@@ -27,35 +27,35 @@ var table=[
     [" ",0,0,0,0]
 ];
 
-var map=func(){
+var map = func() {
     var (vec,x,s)=(nil,nil,size(table));
-    var generator=func(){
+    var generator = func() {
         var tmp=[];
         foreach(var elem;table)
-            if(elem[1]==vec[0][0][3] and elem[2]==0)
+            if (elem[1]==vec[0][0][3] and elem[2]==0)
                 append(tmp,elem);
         vec[1][0]=tmp[rand()*size(tmp)];
 
-        for(var j=1;j<x;j+=1){
-            if(vec[0][j][3]==0 and vec[1][j-1][4]==0 and rand()>0.5){
+        for(var j=1;j<x;j+=1) {
+            if (vec[0][j][3]==0 and vec[1][j-1][4]==0 and rand()>0.5) {
                 vec[1][j]=table[-1];
                 continue;
             }
             
             tmp=[];
             foreach(var elem;table)
-                if(elem[2]==vec[1][j-1][4] and elem[1]==vec[0][j][3]){
-                    if((j==x-1 and elem[4]==0) or j<x-1)
+                if (elem[2]==vec[1][j-1][4] and elem[1]==vec[0][j][3]) {
+                    if ((j==x-1 and elem[4]==0) or j<x-1)
                         append(tmp,elem);
                 }
             vec[1][j]=tmp[rand()*size(tmp)];
         }
     }
     return {
-        new:func(_x=10){
+        new:func(_x=10) {
             x=_x;
             vec=[[],[]];
-            for(var i=0;i<2;i+=1){
+            for(var i=0;i<2;i+=1) {
                 setsize(vec[i],x);
                 for(var j=0;j<x;j+=1)
                     vec[i][j]=table[-1];
@@ -63,15 +63,15 @@ var map=func(){
 
             var tmp=[];
             foreach(var elem;table)
-                if(elem[1]==0 and elem[2]==0)
+                if (elem[1]==0 and elem[2]==0)
                     append(tmp,elem);
             vec[0][0]=tmp[rand()*size(tmp)];
 
-            for(var i=1;i<x;i+=1){
+            for(var i=1;i<x;i+=1) {
                 tmp=[];
                 foreach(var elem;table)
-                    if(elem[2]==vec[0][i-1][4] and elem[1]==0){
-                        if((i==x-1 and elem[4]==0) or i<x-1)
+                    if (elem[2]==vec[0][i-1][4] and elem[1]==0) {
+                        if ((i==x-1 and elem[4]==0) or i<x-1)
                             append(tmp,elem);
                     }
                 vec[0][i]=tmp[rand()*size(tmp)];
@@ -79,14 +79,14 @@ var map=func(){
             me.print(0);
             generator();
         },
-        print:func(index){
+        print:func(index) {
             var str="";
             foreach(var _x;vec[index])
                 str~=_x[0];
             str~="\n";
             print(str);
         },
-        next:func(){
+        next:func() {
             (vec[0],vec[1])=(vec[1],vec[0]);
             generator();
         }
@@ -94,11 +94,11 @@ var map=func(){
 }();
 
 # enable unicode
-if(os.platform()=="windows")
+if (os.platform()=="windows")
     system("chcp 65001");
 map.new(90);
 
-for(var iter=0;iter<40;iter+=1){
+for(var iter=0;iter<40;iter+=1) {
     map.print(1);
     map.next();
 }
\ No newline at end of file
diff --git a/test/word_collector.nas b/test/word_collector.nas
index 32d6916..38e33db 100644
--- a/test/word_collector.nas
+++ b/test/word_collector.nas
@@ -1,12 +1,12 @@
 use std.runtime;
 
-var to_lower=func(s){
+var to_lower = func(s) {
     var tmp="";
-    for(var i=0;i<size(s);i+=1){
+    for(var i=0;i<size(s);i+=1) {
         var c=s[i];
-        if('a'[0]<=c and c<='z'[0])
+        if ('a'[0]<=c and c<='z'[0])
             tmp~=chr(c);
-        elsif('A'[0]<=c and c<='Z'[0])
+        elsif ('A'[0]<=c and c<='Z'[0])
             tmp~=chr(c-'A'[0]+'a'[0]);
         else
             tmp~=chr(c);
@@ -14,23 +14,23 @@ var to_lower=func(s){
     return tmp;
 }
 
-var spliter=func(content){
+var spliter = func(content) {
     var token={};
     var len=size(content);
     var s="";
-    for(var i=0;i<len;i+=1){
+    for(var i=0;i<len;i+=1) {
         var n=content[i];
         var c=chr(n);
-        if(('a'[0]<=n and n<='z'[0]) or ('A'[0]<=n and n<='Z'[0])){
+        if (('a'[0]<=n and n<='z'[0]) or ('A'[0]<=n and n<='Z'[0])) {
             s~=c;
-        }elsif(c=='.' or c==',' or c=='-' or c=='\'' or c=='\"' or c=='!' or c=='?'){
-            if(size(s)) {
+        } elsif (c=='.' or c==',' or c=='-' or c=='\'' or c=='\"' or c=='!' or c=='?') {
+            if (size(s)) {
                 token[to_lower(s)]+=1;
             }
             token[c]+=1;
             s="";
-        }elsif(size(s)){
-            if(s[0]!="-"[0] and s[0]!="'"[0] and s[-1]!="-"[0] and s[-1]!="'"[0])
+        } elsif (size(s)) {
+            if (s[0]!="-"[0] and s[0]!="'"[0] and s[-1]!="-"[0] and s[-1]!="'"[0])
                 token[to_lower(s)]+=1;
             s="";
         }
@@ -38,25 +38,25 @@ var spliter=func(content){
     return token;
 }
 
-func(argv){
-    if(size(argv)<1){
+func(argv) {
+    if (size(argv)<1) {
         println("no input files.");
         exit(-1);
     }
     var all_exists=1;
-    foreach(var f;argv){
-        if(!io.exists(f)){
+    foreach(var f;argv) {
+        if (!io.exists(f)) {
             println("cannot open file <",f,">");
             all_exists=0;
         }
     }
-    if(!all_exists){
+    if (!all_exists) {
         exit(-1);
     }
     var file_content="";
     foreach(var f;argv)
         file_content~=io.readfile(f)~" ";
     var vec=keys(spliter(file_content));
-    sort(vec,func(a,b){return cmp(a,b)<=0;});
+    sort(vec,func(a,b) {return cmp(a,b)<=0;});
     println(vec);
 }(runtime.argv());
\ No newline at end of file
diff --git a/test/ycombinator.nas b/test/ycombinator.nas
index 0efe447..d795988 100644
--- a/test/ycombinator.nas
+++ b/test/ycombinator.nas
@@ -1,15 +1,16 @@
 # Y combinator by ValKmjolnir
-var fib=func(f){
+var fib = func(f) {
     return f(f);
 }(
-    func(f){
-        return func(x){
-            if(x<2) return x;
-            var tmp=f(f);
+    func(f) {
+        return func(x) {
+            if (x<2) return x;
+            var tmp = f(f);
             return tmp(x-1)+tmp(x-2);
         }
     }
 );
 
-for(var i=1;i<31;i+=1)
+for(var i = 1; i<31; i += 1) {
     println(fib(i));
+}
diff --git a/tools/andy_gc_test.nas b/tools/andy_gc_test.nas
index 6960304..3b62316 100644
--- a/tools/andy_gc_test.nas
+++ b/tools/andy_gc_test.nas
@@ -20,40 +20,40 @@ func {
         }
         for(var i=0; i<COUNT; i=i+1) {
             var obj = v[i];
-            if(obj.fielda != i) { print("Ack!\n"); return; }
-            if(obj.fieldb != i) { print("Ack!\n"); return; }
-            if(obj.fieldc != i) { print("Ack!\n"); return; }
-            if(obj.fieldd != i) { print("Ack!\n"); return; }
+            if (obj.fielda != i) { print("Ack!\n"); return; }
+            if (obj.fieldb != i) { print("Ack!\n"); return; }
+            if (obj.fieldc != i) { print("Ack!\n"); return; }
+            if (obj.fieldd != i) { print("Ack!\n"); return; }
             
-            if(obj.fielda != i) { print("Ack!\n"); return; }
-            if(obj.fieldb != i) { print("Ack!\n"); return; }
-            if(obj.fieldc != i) { print("Ack!\n"); return; }
-            if(obj.fieldd != i) { print("Ack!\n"); return; }
+            if (obj.fielda != i) { print("Ack!\n"); return; }
+            if (obj.fieldb != i) { print("Ack!\n"); return; }
+            if (obj.fieldc != i) { print("Ack!\n"); return; }
+            if (obj.fieldd != i) { print("Ack!\n"); return; }
             
-            if(obj.fielda != i) { print("Ack!\n"); return; }
-            if(obj.fieldb != i) { print("Ack!\n"); return; }
-            if(obj.fieldc != i) { print("Ack!\n"); return; }
-            if(obj.fieldd != i) { print("Ack!\n"); return; }
+            if (obj.fielda != i) { print("Ack!\n"); return; }
+            if (obj.fieldb != i) { print("Ack!\n"); return; }
+            if (obj.fieldc != i) { print("Ack!\n"); return; }
+            if (obj.fieldd != i) { print("Ack!\n"); return; }
             
-            if(obj.fielda != i) { print("Ack!\n"); return; }
-            if(obj.fieldb != i) { print("Ack!\n"); return; }
-            if(obj.fieldc != i) { print("Ack!\n"); return; }
-            if(obj.fieldd != i) { print("Ack!\n"); return; }
+            if (obj.fielda != i) { print("Ack!\n"); return; }
+            if (obj.fieldb != i) { print("Ack!\n"); return; }
+            if (obj.fieldc != i) { print("Ack!\n"); return; }
+            if (obj.fieldd != i) { print("Ack!\n"); return; }
             
-            if(obj.fielda != i) { print("Ack!\n"); return; }
-            if(obj.fieldb != i) { print("Ack!\n"); return; }
-            if(obj.fieldc != i) { print("Ack!\n"); return; }
-            if(obj.fieldd != i) { print("Ack!\n"); return; }
+            if (obj.fielda != i) { print("Ack!\n"); return; }
+            if (obj.fieldb != i) { print("Ack!\n"); return; }
+            if (obj.fieldc != i) { print("Ack!\n"); return; }
+            if (obj.fieldd != i) { print("Ack!\n"); return; }
             
-            if(obj.fielda != i) { print("Ack!\n"); return; }
-            if(obj.fieldb != i) { print("Ack!\n"); return; }
-            if(obj.fieldc != i) { print("Ack!\n"); return; }
-            if(obj.fieldd != i) { print("Ack!\n"); return; }
+            if (obj.fielda != i) { print("Ack!\n"); return; }
+            if (obj.fieldb != i) { print("Ack!\n"); return; }
+            if (obj.fieldc != i) { print("Ack!\n"); return; }
+            if (obj.fieldd != i) { print("Ack!\n"); return; }
             
-            if(obj.fielda != i) { print("Ack!\n"); return; }
-            if(obj.fieldb != i) { print("Ack!\n"); return; }
-            if(obj.fieldc != i) { print("Ack!\n"); return; }
-            if(obj.fieldd != i) { print("Ack!\n"); return; }
+            if (obj.fielda != i) { print("Ack!\n"); return; }
+            if (obj.fieldb != i) { print("Ack!\n"); return; }
+            if (obj.fieldc != i) { print("Ack!\n"); return; }
+            if (obj.fieldd != i) { print("Ack!\n"); return; }
         }
 }
 }();
@@ -69,7 +69,7 @@ print("cos(32) = ", math.cos(angle), "\n");
 print("s^2 + c^s = ",
        math.sin(angle)*math.sin(angle)+math.cos(angle)*math.cos(angle), "\n");
     
-func{for(var j=0; j<10; j=j+1) {
+func {for(var j=0; j<10; j=j+1) {
     print(j, "/10\n");
 
     # Make some tables to store stuff.  This will clobber the contents
@@ -87,7 +87,7 @@ func{for(var j=0; j<10; j=j+1) {
 
     # Check that we get back what we put in
     for(i=0; i<65536; i=i+1) {
-        if(v[i] != h2[h1[v[i]~""]~""][0]) {
+        if (v[i] != h2[h1[v[i]~""]~""][0]) {
             print("Ack!\n");
             return;
         }
diff --git a/tools/compiling_test.nas b/tools/compiling_test.nas
new file mode 100644
index 0000000..8c3fab6
--- /dev/null
+++ b/tools/compiling_test.nas
@@ -0,0 +1,29 @@
+use std.file;
+
+var check = func(dir_name) {
+    var ts = maketimestamp();
+    var f = file.find_all_files_with_extension(dir_name, "nas");
+    var res = [];
+    foreach(var k; f) {
+        ts.stamp();
+        if (system("nasal -c "~dir_name~"/"~k~" 1>/dev/null 2>/dev/null")!=0) {
+            println("\e[31merror\e[0m ", dir_name, "/", k);
+            append(res, dir_name~"/"~k);
+        }
+        println("compiling ", dir_name, "/", k, " in \e[32m", ts.elapsedMSec(), "\e[0m ms");
+    }
+    return res;
+}
+
+var result = [
+    check("./std"),
+    check("./module"),
+    check("./tools"),
+    check("./test")
+];
+println();
+foreach(var i; result) {
+    foreach(var j; i) {
+        println("\e[31merror\e[0m ", j);
+    }
+}
\ No newline at end of file
diff --git a/tools/push.nas b/tools/push.nas
index 51c45d3..c4c1a60 100644
--- a/tools/push.nas
+++ b/tools/push.nas
@@ -1,9 +1,9 @@
 
-println("[",os.time(),"] (=.=) auto push, please wait...");
+println("[", os.time(), "] (=.=) auto push, please wait...");
 
 while(system("git push")!=0) {
-    println("[",os.time(),"] (ToT) failed to push, retrying...");
+    println("[", os.time(), "] (ToT) failed to push, retrying...");
     unix.sleep(0.5);
 }
 
-println("[",os.time(),"] (^o^) auto push complete.");
+println("[", os.time(), "] (^o^) auto push complete.");