✨ add check for symbol definition

src/nasal_codegen.cpp

@@ -75,11 +75,14 @@ void codegen::regist_str(const std::string& str) {
 void codegen::find_symbol(code_block* node) {
     auto finder = std::unique_ptr<symbol_finder>(new symbol_finder);
     for(const auto& i : finder->do_find(node)) {
-        if (!experimental_namespace.count(i.file)) {
-            experimental_namespace[i.file] = {};
+        if (native_function_mapper.count(i.name)) {
+            die("definition conflicts with native function", i.location);
         }
-        if (local.empty() && !experimental_namespace.at(i.file).count(i.name)) {
-            experimental_namespace.at(i.file).insert(i.name);
+        if (!experimental_namespace.count(i.location.file)) {
+            experimental_namespace[i.location.file] = {};
+        }
+        if (local.empty() && !experimental_namespace.at(i.location.file).count(i.name)) {
+            experimental_namespace.at(i.location.file).insert(i.name);
         }
         add_symbol(i.name);
     }

src/nasal_gc.cpp

@@ -107,9 +107,19 @@ void nas_ghost::set(
 }
 
 void nas_ghost::clear() {
-    if (!ptr || !dtor_ptr) {
+    // do nothing if pointer is null
+    if (!ptr) {
         return;
     }
+
+    // do clear pointer if destructor function pointer is null
+    if (!dtor_ptr) {
+        type_name = "";
+        ptr = nullptr;
+        return;
+    }
+
+    // do destruction
     dtor_ptr(ptr);
     type_name = "";
     ptr = nullptr;

src/symbol_finder.cpp

@@ -4,13 +4,13 @@ bool symbol_finder::visit_definition_expr(definition_expr* node) {
     if (node->get_variable_name()) {
         symbols.push_back({
             node->get_variable_name()->get_name(),
-            node->get_variable_name()->get_location().file
+            node->get_variable_name()->get_location()
         });
     } else {
         for(auto i : node->get_variables()->get_variables()) {
             symbols.push_back({
                 i->get_name(),
-                i->get_location().file
+                i->get_location()
             });
         }
     }
@@ -30,7 +30,8 @@ bool symbol_finder::visit_iter_expr(iter_expr* node) {
     if (node->get_name()) {
         symbols.push_back({
             node->get_name()->get_name(),
-            node->get_name()->get_location().file});
+            node->get_name()->get_location()
+        });
     }
     return true;
 }

src/symbol_finder.h

@@ -11,7 +11,7 @@ class symbol_finder:public ast_visitor {
 public:
     struct symbol_info {
         std::string name;
-        std::string file;
+        span location;
     };
 
 private:

std/props.nas

@@ -10,42 +10,152 @@
 # available in C++; just use node.getNode(path).whatever() instead.
 #
 
-# unfinished
-var getprop = func {}
-var fgcommand = func {}
-var _globals = func {}
-var _createCondition = func {}
-var _new = func {}
-var string = {};
-var _getNode = func {};
-var _getParent = func {};
-var _getChildren = func {};
-var _setChildren = func {};
-var _alias = func {};
-var _equals = func {};
-var _unalias = func {};
-var _adjustValue = func {};
-var _setDoubleValue = func {};
-var _setIntValue = func {};
-var _setBoolValue = func {};
-var _toggleBoolValue = func {};
-var _setValue = func {};
-var _setValues = func {};
-var _getAttribute = func {};
-var _setAttribute = func {};
-var _getValue = func {};
-var _getType = func {};
-var _isNumeric = func {};
-var _isInt = func {};
-var _getIndex = func {};
-var _getName = func {};
-var _getAliasTarget = func {};
-var _getChild = func {};
-var _addChild = func {};
-var _addChildren = func {};
-var _removeChild = func {};
-var _removeChildren = func {};
-var _removeAllChildren = func {};
+var _new = func {
+    return {
+        type: "",
+        name: "",
+        value: nil,
+        parent_list:[],
+        child_list:[]
+    };
+}
+
+var _fg_props_globals = _new();
+var _globals = func {
+    return _fg_props_globals;
+}
+
+var getprop = func(arg...) {
+    die("unimplemented");
+}
+
+var addcommand = func(name, code) {
+    die("unimplemented");
+}
+
+var fgcommand = func(name, args = nil) {
+    die("unimplemented");
+}
+
+var _createCondition = func {
+    die("unimplemented");
+}
+
+var _getNode = func {
+    die("unimplemented");
+};
+
+var _getParent = func {
+    die("unimplemented");
+};
+
+var _getChildren = func {
+    die("unimplemented");
+};
+
+var _setChildren = func {
+    die("unimplemented");
+};
+
+var _alias = func {
+    die("unimplemented");
+};
+
+var _equals = func {
+    die("unimplemented");
+};
+
+var _unalias = func {
+    die("unimplemented");
+};
+
+var _adjustValue = func {
+    die("unimplemented");
+};
+
+var _setDoubleValue = func {
+    die("unimplemented");
+};
+
+var _setIntValue = func {
+    die("unimplemented");
+};
+
+var _setBoolValue = func {
+    die("unimplemented");
+};
+
+var _toggleBoolValue = func {
+    die("unimplemented");
+};
+
+var _setValue = func {
+    die("unimplemented");
+};
+
+var _setValues = func {
+    die("unimplemented");
+};
+
+var _getAttribute = func {
+    die("unimplemented");
+};
+
+var _setAttribute = func {
+    die("unimplemented");
+};
+
+var _getValue = func {
+    die("unimplemented");
+};
+
+var _getType = func {
+    die("unimplemented");
+};
+
+var _isNumeric = func {
+    die("unimplemented");
+};
+
+var _isInt = func {
+    die("unimplemented");
+};
+
+var _getIndex = func {
+    die("unimplemented");
+};
+
+var _getName = func {
+    die("unimplemented");
+};
+
+var _getAliasTarget = func {
+    die("unimplemented");
+};
+
+var _getChild = func {
+    die("unimplemented");
+};
+
+var _addChild = func {
+    die("unimplemented");
+};
+
+var _addChildren = func {
+    die("unimplemented");
+};
+
+var _removeChild = func {
+    die("unimplemented");
+};
+
+var _removeChildren = func {
+    die("unimplemented");
+};
+
+var _removeAllChildren = func {
+    die("unimplemented");
+};
 
 
 var Node = {
@@ -190,8 +300,9 @@ var Node = {
 #
 Node.new = func(values = nil) {
     var result = wrapNode(_new());
-    if(ishash(values))
+    if(ishash(values)) {
         result.setValues(values);
+    }
     return result;
 }
 
@@ -331,14 +442,18 @@ var wrap = func(node) {
 # Node object and its _g (ghost) field set to the specified object.
 # Nasal's literal syntax can be pleasingly terse. I like that. :)
 #
-var wrapNode = func(node) { { parents : [Node], _g : node } }
+var wrapNode = func(node) {
+    return { parents : [Node], _g : node };
+}
 
 ##
 # Global property tree.  Set once at initialization.  Is that OK?
 # Does anything ever call globals.set_props() from C++?  May need to
 # turn this into a function if so.
 #
-var globals = wrapNode(_globals());
+var globals = func {
+    return wrapNode(_globals());
+}();
 
 ##
 # Shortcut for props.globals.getNode().