lextest.cc

//
// See copyright.h for copyright notice and limitation of liability
// and disclaimer of warranty provisions.
//
#include "copyright.h"

//////////////////////////////////////////////////////////////////////////////
//
//  lextest.cc
//
//  Reads input from file argument.
//
//  Option -l prints summary of flex actions.
//
//////////////////////////////////////////////////////////////////////////////

#include <stdio.h>      // needed on Linux system
#include <unistd.h>     // for getopt
#include "cool-parse.h" // bison-generated file; defines tokens
#include "utilities.h"

//
//  The lexer keeps this global variable up to date with the line number
//  of the current line read from the input.
//
int curr_lineno = 1;
char *curr_filename = "<stdin>"; // this name is arbitrary
FILE *fin;   // This is the file pointer from which the lexer reads its input.

//
//  cool_yylex() is the function produced by flex. It returns the next
//  token each time it is called.
//
extern int cool_yylex();
YYSTYPE cool_yylval;           // Not compiled with parser, so must define this.

extern int optind;  // used for option processing (man 3 getopt for more info)

//
//  Option -v sets the lex_verbose flag. The main() function prints out tokens
//  if the program is invoked with option -v.  Option -l sets yy_flex_debug.
//
extern int yy_flex_debug;      // Flex debugging; see flex documentation.
extern int lex_verbose;        // Controls printing of tokens.
void handle_flags(int argc, char *argv[]);

//
//  The full Cool compiler contains several debugging flags, all of which
//  are handled and set by the routine handle_flags.  Here we declare
//  cool_yydebug, which is not used by the lexer but is needed to link
//  with handle_flags.
//
int  cool_yydebug;

// defined in utilities.cc
extern void dump_cool_token(ostream& out, int lineno, 
			    int token, YYSTYPE yylval);


int main(int argc, char** argv) {
	int token;
	
	handle_flags(argc,argv);

	while (optind < argc) {
	    fin = fopen(argv[optind], "r");
	    if (fin == NULL) {
		cerr << "Could not open input file " << argv[optind] << endl;
		exit(1);
	    }

            // sm: the 'coolc' compiler's file-handling loop resets
            // this counter, so let's make the stand-alone lexer
            // do the same thing
            curr_lineno = 1;

	    //
	    // Scan and print all tokens.
	    //
	    cout << "#name \"" << argv[optind] << "\"" << endl;
	    while ((token = cool_yylex()) != 0) {
			dump_cool_token(cout, curr_lineno, token, cool_yylval);
	    }
	    fclose(fin);
	    optind++;
	}
	exit(0);
}