main.cc

来自「编译原理课程设计之pp2语法分析程序」· CC 代码 · 共 37 行

/* File: main.cc
 * -------------
 * This file defines the main() routine for the program and not much else.
 * You should not need to modify this file.
 */
 
#include <string.h>
#include <stdio.h>
#include "utility.h"
#include "parser.h"

extern Program *program;
/*
 * Function: main()
 * ----------------
 * Entry point to the entire program.  We parse the command line and turn
 * on any debugging flags requested by the user when invoking the program.
 * InitScanner() is used to set up the scanner.
 * InitParser() is used to set up the parser. The call to yyparse() will
 * attempt to parse a complete program from the input. 
 */
int main(int argc, char *argv[])
{
    ParseCommandLine(argc, argv);//定义在utility.cc
  
    InitScanner();//scanner.l
    InitParser(); //parse.y
    if (yyparse() == 0) /* parsing worked */
    {
	    program->PrintChildren(0);
	    return 0;
    }
    else return -1;
    return 0;
}