main.c

这是一个功能比较完善的词法分析器

/****************************************************/
/* File: main.c                                     */
/* Main program for C-Minus compiler                   */
/* Compiler Construction: Principles and Practice   */
/****************************************************/


#include "globals2.h"

/* set NO_PARSE to TRUE to get a scanner-only compiler */
#define NO_PARSE FALSE
/* set NO_ANALYZE to TRUE to get a parser-only compiler */
#define NO_ANALYZE FALSE

/* set NO_CODE to TRUE to get a compiler that does not
 * generate code
 */
#define NO_CODE FALSE

#include "UTIL.H "
#include "scan.h"


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

/* allocate and set tracing flags */
int EchoSource = FALSE;
int TraceScan = TRUE;
int TraceParse = FALSE;
int TraceAnalyze = FALSE;
int TraceCode = FALSE;

int Error = FALSE;

main( int argc, char * argv[] )
{ //TreeNode * syntaxTree;
  char pgm[120]; /* source code file name */
  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,"\nC-Minus COMPILATION: %s\n",pgm);
  while (getToken()!=ENDFILE);
/*#else
  syntaxTree = parse();
  if (TraceParse) {
    fprintf(listing,"\nSyntax tree:\n");

  fclose(source);
  return 0;*/
}