main.c

根据tiny实现的C-词法语法分析器 编译原理课程

/****************************************************/
/* File: main.c                                     */
/* Main program for TINY compiler                   */
/* Compiler Construction: Principles and Practice   */
/* Kenneth C. Louden                                */
/****************************************************/

#include "globals.h"
#include "util.h"
#include "scan.h"
#include "parse.h"


/* allocate global variables */
int lineno = 0;
FILE * source;
FILE * listing;
FILE * code;

/* allocate and set tracing flags */
int EchoSource = TRUE;
int TraceScan = TRUE;

main( int argc, char * argv[] )
{ 
	int i=0;
char pgm[120]; /* source code file name */
fp=fopen("a.txt","wb+");
  argv[1]="1t";
  argc=2;
  if (argc != 2)
    { fprintf(stderr,"usage: %s <filename>\n",argv[0]);
      exit(1);
    }

  strcpy(pgm,argv[1]);
  if (strchr (pgm, '.') == NULL)
     strcat(pgm,".tny");
  source = fopen(pgm,"r");
  if (source==NULL)
  { fprintf(stderr,"File %s not found\n",pgm);
    exit(1);
  }

  listing = stdout; /* send listing to screen */
  fprintf(listing,"\nTINY COMPILATION: %s\n",pgm);

 // while (getToken()!=ENDFILE);

  parse();//语法分析
  initiate();
  printf("print parse tree: in a.txt \n");
  fputs("print parse tree:\r\n",fp);

  rewind(source);//源文件指针重定位
  //fseek(source,0L,0);
//source = fopen(pgm,"r");

  TraceScan = FALSE;
  EchoSource = FALSE;

  fputs("program\r\n",fp);
  sp=1;
  flag=0;
  parsetr(td);//分析树构造
  printtree(td);//输出分析树

  fclose(source);
  return 0;
}