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  1. %{
  2. /* program to recognize a C program */
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. int COMMENT = 0;
  6. %}
  7.  
  8. identifier     [a-zA-Z_][a-zA-Z0-9_]*
  9. number         [0-9]+
  10. string         "\".*\""
  11. relop          (<=|>=|<|==|>)
  12. assignment     =
  13.  
  14. %%
  15. #.*                              { printf("\n%s is a PREPROCESSOR DIRECTIVE", yytext); }
  16.  
  17. int|float|char|double|while|for|do|if|break|continue|void|switch|case|long|struct|const|typedef|return|else|goto
  18.                                     { printf("\n\t%s is a KEYWORD", yytext); }
  19.  
  20. "/*"                              { COMMENT = 1; }
  21. "*/"                              { COMMENT = 0; }
  22. {identifier}\(                    { if (!COMMENT) printf("\n\nFUNCTION\n\t%s", yytext); }
  23. "{"                               { if (!COMMENT) printf("\n BLOCK BEGINS"); }
  24. "}"                               { if (!COMMENT) printf("\n BLOCK ENDS"); }
  25. {identifier}(\[[0-9]*\])?         { if (!COMMENT) printf("\n %s is an IDENTIFIER", yytext); }
  26. {string}                          { if (!COMMENT) printf("\n\t%s is a STRING", yytext); }
  27. {number}                          { if (!COMMENT) printf("\n\t%s is a NUMBER", yytext); }
  28. {assignment}                      { if (!COMMENT) printf("\n\t%s is an ASSIGNMENT OPERATOR", yytext); }
  29. {relop}                           { if (!COMMENT) printf("\n\t%s is a RELATIONAL OPERATOR", yytext); }
  30.  
  31. .                                 { if (!COMMENT) printf("\n\t"); ECHO; printf("\n"); }
  32.  
  33. %%
  34.  
  35. int main(int argc, char **argv) {
  36.     if (argc > 1) {
  37.         FILE *file = fopen(argv[1], "r");
  38.         if (!file) {
  39.             printf("Could not open %s \n", argv[1]);
  40.             exit(0);
  41.         }
  42.         yyin = file;
  43.     }
  44.     yylex();
  45.     printf("\n\n");
  46.     return 0;
  47. }
  48.  
  49. int yywrap() {
  50.     return 1;
  51. }
  52.  
Success #stdin #stdout #stderr 0.03s 6860KB
comments (?)
stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/wqq5wW/prog:3:1: Syntax error: Operator expected
ERROR: /home/wqq5wW/prog:51:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/63WFMB
language:
Prolog (swi 7.6.4)
created:
6 days ago
visibility:
public

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