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Nasal-Interpreter
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Update lexer : char recognition

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Valk Richard Li 2019-08-29 08:34:16 -05:00 committed by GitHub
parent a0126f9537
commit 91d61b613e
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1 changed files with 26 additions and 9 deletions
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35
version0.7/nasal_lexer.h
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@ -6,14 +6,15 @@
#include <list> #include <list>
#include <cstring> #include <cstring>
#define OPERATOR 1 //界符 or 运算符 #define OPERATOR 1 //operator
#define IDENTIFIER 2 //自定义标识符 #define IDENTIFIER 2 //id
#define NUMBER 3 //数字 #define NUMBER 3 //number
#define RESERVEWORD 4 //关键字 #define RESERVEWORD 4 //reserve word
#define STRING 5 //字符串类型 #define STRING 5 //string
#define FAIL -1 //失败 #define CHAR 6 //char
#define SCANEND -2 //扫描完成 #define FAIL -1 //fail
#define ERRORFOUND -3 //异常错误 #define SCANEND -2 //complete scanning
#define ERRORFOUND -3 //error occurred
std::string reserve_word[15]= std::string reserve_word[15]=
{ {
@ -218,13 +219,27 @@ class nasal_lexer
} }
else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' || else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' ||
temp=='}' || temp==',' || temp==';' || temp=='|' || temp==':' || temp=='}' || temp==',' || temp==';' || temp=='|' || temp==':' ||
temp=='?' || temp=='.' || temp=='`' || temp=='\'' || temp=='&'|| temp=='?' || temp=='.' || temp=='`' || temp=='&'||
temp=='%' || temp=='$' || temp=='^') temp=='%' || temp=='$' || temp=='^')
{ {
__token+=temp; __token+=temp;
++ptr; ++ptr;
syn=OPERATOR; syn=OPERATOR;
} }
else if(temp=='\'')
{
__token+=temp;
++ptr;
temp=source[ptr];
__token+=temp;
++ptr;
temp=source[ptr];
__token+=temp;
++ptr;
if(temp!='\'')
std::cout<<">>[Lexer] Abnormal char type detected: "<<__token<<" ."<<std::endl;
syn=CHAR;
}
else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' || temp=='/' || temp=='<' || temp=='>' || temp=='~') else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' || temp=='/' || temp=='<' || temp=='>' || temp=='~')
{ {
syn=OPERATOR; syn=OPERATOR;
@ -346,6 +361,8 @@ class nasal_lexer
std::cout<<"( ReserveWord | "; std::cout<<"( ReserveWord | ";
else if(temp.type==STRING) else if(temp.type==STRING)
std::cout<<"( String | "; std::cout<<"( String | ";
else if(temp.type==CHAR)
std::cout<<"( Char | ";
std::cout<<temp.content<<" )"<<std::endl; std::cout<<temp.content<<" )"<<std::endl;
} }
return; return;