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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. int COMMENT = 0;   // Flag for multi-line comments
  6. %}
  7.  
  8. identifier [a-zA-Z_][a-zA-Z0-9_]*
  9. number [0-9]+
  10.  
  11. %%
  12.  
  13. #.*                                     { printf("\n%s is a PREPROCESSOR DIRECTIVE", yytext); }
  14.  
  15. (int|float|char|double|while|for|struct|typedef|do|if|break|continue|void|switch|return|else|goto)
  16.                                         { printf("\n%s is a KEYWORD", yytext); }
  17.  
  18. "/*"                                    { COMMENT = 1; printf("\n%s is a COMMENT", yytext); }
  19. "*/"                                    { COMMENT = 0; printf("\n%s ends COMMENT", yytext); }
  20.  
  21. {identifier}\(                          { if(!COMMENT) printf("\n%s FUNCTION", yytext); }
  22.  
  23. {identifier}(\[[0-9]*\])?               { if(!COMMENT) printf("\n%s IDENTIFIER", yytext); }
  24.  
  25. \{                                      { if(!COMMENT) printf("\nBLOCK BEGINS"); }
  26. \}                                      { if(!COMMENT) printf("\nBLOCK ENDS"); }
  27.  
  28. \;                                      { if(!COMMENT) printf("\n%s PUNCTUATOR", yytext); }
  29.  
  30. \".*\"                                  { if(!COMMENT) printf("\n%s STRING", yytext); }
  31.  
  32. {number}                                { if(!COMMENT) printf("\n%s NUMBER", yytext); }
  33.  
  34. =                                       { if(!COMMENT) printf("\n%s ASSIGNMENT OPERATOR", yytext); }
  35.  
  36. "=="|"<="|">="|"<"|">"                  { if(!COMMENT) printf("\n%s RELATIONAL OPERATOR", yytext); }
  37.  
  38. "+"|"-"|"*"|"/"                         { if(!COMMENT) printf("\n%s ARITHMETIC OPERATOR", yytext); }
  39.  
  40. [ \t\n]+                                { /* ignore whitespace */ }
  41.  
  42. .                                       { /* ignore other characters */ }
  43.  
  44. %%
  45.  
  46. int main(int argc, char **argv) {
  47.     FILE *file = fopen("var.c", "r");   // File to analyze
  48.     if (!file) {
  49.         printf("Could not open the file\n");
  50.         exit(0);
  51.     }
  52.  
  53.     yyin = file;   // Set input for lexer
  54.     yylex();       // Start lexical analysis
  55.     printf("\nLexical Analysis Complete.\n");
  56.     return 0;
  57. }
  58.  
  59. int yywrap() {
  60.     return 1;
  61. }
  62.  
Success #stdin #stdout #stderr 0.03s 6808KB
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/VTwlbK/prog:2:1: Syntax error: Operator expected
ERROR: /home/VTwlbK/prog:61:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/mA2o85
language:
Prolog (swi 7.6.4)
created:
8 days ago
visibility:
public

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