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Valk Richard Li
2020-10-25 22:15:49 +08:00
parent 67ae3505fb
commit 9a9277c505
4 changed files with 232 additions and 6 deletions
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test/lexer.nas
+171
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@@ -0,0 +1,171 @@
import("lib.nas");
var s=io.fin("lexer.nas");
s=split('',s);
var len=size(s);
var ptr=0;
var cmp=func(s1,s2)
{
var size1=size(s1);
var size2=size(s2);
if(size1!=size2)
return size1<size2;
for(var i=0;i<size1;i+=1)
if(s1[i]>s2[i])
return 0;
return 1;
}
var jump_note=func()
{
while(ptr<len and s[ptr]!='\n')
ptr+=1;
ptr+=1;
return;
}
var generate_id=func()
{
var tmp="";
while(ptr<len)
{
if('a'[0]<=s[ptr][0] and s[ptr][0]<='z'[0]
or 'A'[0]<=s[ptr][0] and s[ptr][0]<='Z'[0]
or s[ptr]=='_'
or '0'[0]<=s[ptr][0] and s[ptr][0]<='9'[0])
tmp~=s[ptr];
else
break;
ptr+=1;
}
return tmp;
}
var generate_str=func()
{
var tok_str="";
var mark=s[ptr];
ptr+=1;
while(ptr<len and s[ptr]!=mark)
{
if(s[ptr]=='\\')
{
ptr+=1;
if(s[ptr]=='a') tok_str~='\a';
elsif(s[ptr]=='b') tok_str~='\b';
elsif(s[ptr]=='f') tok_str~='\f';
elsif(s[ptr]=='n') tok_str~='\n';
elsif(s[ptr]=='r') tok_str~='\r';
elsif(s[ptr]=='t') tok_str~='\t';
elsif(s[ptr]=='v') tok_str~='\v';
elsif(s[ptr]=='?') tok_str~='?';
elsif(s[ptr]=='0') tok_str~='\0';
elsif(s[ptr]=='\\') tok_str~='\\';
elsif(s[ptr]=='\'') tok_str~='\'';
elsif(s[ptr]=='\"') tok_str~='\"';
else tok_str~=s[ptr];
}
else
tok_str~=s[ptr];
ptr+=1;
}
if(ptr>=len)
{
print("read eof when generating string.");
break;
}
ptr+=1;
return tok_str;
}
var generate_number=func()
{
var number=s[ptr];
ptr+=1;
if(s[ptr]=='x')
{
ptr+=1;
while(ptr<len and ('a'[0]<=s[ptr][0] and s[ptr][0]<='f'[0] or '0'[0]<=s[ptr][0] and s[ptr][0]<='9'[0]))
{
number~=s[ptr];
ptr+=1;
}
return num(number);
}
elsif(s[ptr]=='o')
{
ptr+=1;
while(ptr<len and ('0'[0]<=s[ptr][0] and s[ptr][0]<='7'[0]))
{
number~=s[ptr];
ptr+=1;
}
return num(number);
}
while(ptr<len and ('0'[0]<=s[ptr][0] and s[ptr][0]<='9'[0]))
{
number~=s[ptr];
ptr+=1;
}
if(s[ptr]=='.')
number~=s[ptr];
else
return num(number);
return num(number);
}
var generate_operator=func()
{
var tmp="";
if(s[ptr]=='+' or s[ptr]=='-' or s[ptr]=='~' or s[ptr]=='/' or s[ptr]=='*' or s[ptr]=='>' or s[ptr]=='<' or s[ptr]=='!' or s[ptr]=='=')
{
tmp=s[ptr];
ptr+=1;
if(ptr<len and s[ptr]=='=')
{
tmp~=s[ptr];
ptr+=1;
}
return tmp;
}
elsif(s[ptr]=='.')
{
if(ptr+2<len and s[ptr+1]=='.' and s[ptr+2]=='.')
{
tmp='...';
ptr+=3;
}
else
{
tmp='.';
ptr+=1;
}
return tmp;
}
elsif(s[ptr]!=' ' and s[ptr]!='\t' and s[ptr]!='\n' and s[ptr]!='\r' and s[ptr][0]>0)
tmp=s[ptr];
ptr+=1;
return tmp;
}
var cnt=0;
while(ptr<len)
{
if(s[ptr]=='#')
jump_note();
elsif('a'[0]<=s[ptr][0] and s[ptr][0]<='z'[0] or 'A'[0]<=s[ptr][0] and s[ptr][0]<='Z'[0] or s[ptr]=='_')
print("(",cnt+=1," | ",generate_id(),")");
elsif(s[ptr]=='\'' or s[ptr]=='\"')
print("(",cnt+=1," | \"",generate_str(),"\")");
elsif('0'[0]<=s[ptr][0] and s[ptr][0]<='9'[0])
print("(",cnt+=1," | ",generate_number(),")");
else
{
var tmp=generate_operator();
if(size(tmp))
print("(",cnt+=1," | ",tmp,")");
}
if(ptr>=len)
break;
}