PHP内核探索：虚拟机的词法解析

[php]代码库

#include <stdio.h>
 
char *scan(char *p){
#define YYCTYPE char
#define YYCURSOR p
#define YYLIMIT p
#define YYMARKER q
#define YYFILL(n)
    /*!re2c
      [0-9]+ {return "number";}
      [a-z]+ {return "lower";}
      [A-Z]+ {return "upper";}
      [^] {return "unkown";}
     */
}
 
int main(int argc, char* argv[])
{
    printf("%s\n", scan(argv[1]));
 
    return 0;
}