xxq250/Nasal-Interpreter
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This commit is contained in:
Valk Richard Li
2020-12-19 23:47:04 +08:00
parent fed1e20085
commit 4617eb8f17
5 changed files with 886 additions and 996 deletions
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nasal_lexer.h
+14 -41
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@@ -89,6 +89,7 @@ struct token
int line;
int type;
std::string str;
token(int l=0,int t=tok_null,std::string s=""){line=l;type=t;str=s;return;}
};
class nasal_lexer
@@ -116,10 +117,7 @@ public:
void nasal_lexer::clear()
{
error=0;
res_size=0;
line=0;
ptr=0;
error=res_size=line=ptr=0;
line_code="";
res.clear();
token_list.clear();
@@ -243,8 +241,6 @@ std::string nasal_lexer::number_gen()
die("["+line_code+"_] incorrect number.",line,line_code.length());
return "0";
}
if(ptr<res_size && res[ptr]=='0')
token_str+=res[ptr++];
while(ptr<res_size && IS_DIGIT(res[ptr]))
token_str+=res[ptr++];
// "xxxe(-|+)" is not a correct number
@@ -274,8 +270,7 @@ std::string nasal_lexer::string_gen()
}
if(res[ptr]=='\\' && ptr+1<res_size)
{
++ptr;
line_code+=res[ptr];
line_code+=res[++ptr];
switch(res[ptr])
{
case 'a':token_str.push_back('\a');break;
@@ -298,9 +293,8 @@ std::string nasal_lexer::string_gen()
++ptr;
}
// check if this string ends with a " or '
if(ptr>=res_size)
if(ptr++>=res_size)
die("["+line_code+"_] get EOF when generating string.",line,line_code.length());
++ptr;
return token_str;
}
@@ -318,21 +312,17 @@ void nasal_lexer::scanner()
{
// these characters will be ignored, and '\n' will cause ++line
line_code+=res[ptr];
if(res[ptr]=='\n')
if(res[ptr++]=='\n')
{
++line;
line_code="";
}
++ptr;
}
if(ptr>=res_size) break;
if(IS_IDENTIFIER(res[ptr]))
{
token_str=identifier_gen();
token new_token;
new_token.line=line;
new_token.str=token_str;
new_token.type=0;
token new_token(line,0,token_str);
for(int i=0;token_table[i].str;++i)
if(token_str==token_table[i].str)
{
@@ -346,19 +336,13 @@ void nasal_lexer::scanner()
else if(IS_DIGIT(res[ptr]))
{
token_str=number_gen();
token new_token;
new_token.line=line;
new_token.str=token_str;
new_token.type=tok_number;
token new_token(line,tok_number,token_str);
token_list.push_back(new_token);
}
else if(IS_STRING(res[ptr]))
{
token_str=string_gen();
token new_token;
new_token.line=line;
new_token.type=tok_string;
new_token.str=token_str;
token new_token(line,tok_string,token_str);
token_list.push_back(new_token);
}
else if(IS_SINGLE_OPRATOR(res[ptr]))
@@ -366,10 +350,7 @@ void nasal_lexer::scanner()
token_str="";
token_str+=res[ptr];
line_code+=res[ptr];
token new_token;
new_token.line=line;
new_token.str=token_str;
new_token.type=-1;
token new_token(line,-1,token_str);
for(int i=0;token_table[i].str;++i)
if(token_str==token_table[i].str)
{
@@ -394,9 +375,7 @@ void nasal_lexer::scanner()
++ptr;
}
line_code+=token_str;
token new_token;
new_token.line=line;
new_token.str=token_str;
token new_token(line,-1,token_str);
for(int i=0;token_table[i].str;++i)
if(token_str==token_table[i].str)
{
@@ -410,15 +389,10 @@ void nasal_lexer::scanner()
// get calculation operator
token_str=res[ptr];
++ptr;
if(ptr<res.size() && res[ptr]=='=')
{
token_str+=res[ptr];
++ptr;
}
if(ptr<res_size && res[ptr]=='=')
token_str+=res[ptr++];
line_code+=token_str;
token new_token;
new_token.line=line;
new_token.str=token_str;
token new_token(line,-1,token_str);
for(int i=0;token_table[i].str;++i)
if(token_str==token_table[i].str)
{
@@ -436,9 +410,8 @@ void nasal_lexer::scanner()
}
else
{
line_code+=res[ptr];
line_code+=res[ptr++];
die("["+line_code+"_] unknown character.",line,line_code.length());
++ptr;
}
}
return;