[英]how to use `yy_scan_string(const char *str)` (generated by lex yacc ) in a separated file
I want to use YY_BUFFER_STATE yy_scan_string(const char *str)
and other functions like yyparse()
in my main.cpp
, I did things: 我想在我的
main.cpp
使用YY_BUFFER_STATE yy_scan_string(const char *str)
和yyparse()
等其他函数,我做了一些事情:
extern "C"{
extern YY_BUFFER_STATE yy_scan_string(const char *str);
}
But there is a error error:
YY_BUFFER_STATE' does not name a type`, then I did: 但是有一个错误
error:
YY_BUFFER_STATE'没有命名类型`,然后我做了:
extern yy_buffer_state;
typedef yy_buffer_state *YY_BUFFER_STATE;
extern int yyparse();
extern YY_BUFFER_STATE yy_scan_buffer(char *, size_t);
But the same problem also, how to do it, thanks, really appreciate your help!! 但同样的问题,怎么做,谢谢,真的很感谢你的帮助!
Here is the main.cpp file. 这是main.cpp文件。 #include "main.h"
#include“main.h”
#include <string.h>
extern "C"{void scan_string(const char* str);}
int yyparse();
void test::getvalue(int& var)
{
if (var!=0)
std::cout<<"True"<<std::endl;
else
std::cout<<"False"<<std::endl;
}
int main(){
std::string str="T+F";
//how to send str as an Input to parse?
yyparse();
return 0;
}
The simplest solution is probably to add a separate function in your grammar file that in turn call yy_scan_string
. 最简单的解决方案可能是在语法文件中添加一个单独的函数,该函数又调用
yy_scan_string
。
/* Stuff... */
%%
/* Grammar */
%%
void scan_string(const char* str)
{
yy_switch_to_buffer(yy_scan_string(str));
}
Then call scan_string
from your code. 然后从您的代码中调用
scan_string
。
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