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  1. l%{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. int COMMENT = 0;
  5. %}
  6.  
  7. identifier [a-zA-Z_][a-zA-Z0-9_]*
  8.  
  9. %%
  10. "#".*                   { printf("\n%s : Preprocessor Directive", yytext); }
  11.  
  12. "int"|"float"|"char"|"double"|"while"|"for"|"struct"|"typedef"|
  13. "do"|"if"|"break"|"continue"|"void"|"switch"|"return"|
  14. "else"|"goto"
  15.                          { printf("\n%s : Keyword", yytext); }
  16.  
  17. "/*"                    { COMMENT = 1; printf("\nComment Start"); }
  18. "*/"                    { COMMENT = 0; printf("\nComment End"); }
  19.  
  20. {identifier}"("         { if(!COMMENT) printf("\n%s : Function", yytext); }
  21.  
  22. "{"                     { if(!COMMENT) printf("\nBlock Begins"); }
  23. "}"                     { if(!COMMENT) printf("\nBlock Ends"); }
  24.  
  25. {identifier}(\[[0-9]*\])?
  26.                          { if(!COMMENT) printf("\n%s : Identifier", yytext); }
  27.  
  28. \".*\"                  { if(!COMMENT) printf("\n%s : String", yytext); }
  29.  
  30. [0-9]+                  { if(!COMMENT) printf("\n%s : Number", yytext); }
  31.  
  32. "="                     { if(!COMMENT) printf("\n= : Assignment Operator"); }
  33.  
  34. "<="|">="|"=="|"<"|">"
  35.                          { if(!COMMENT) printf("\n%s : Relational Operator", yytext); }
  36.  
  37. ";"                     { if(!COMMENT) printf("\n; : Statement Terminator"); }
  38.  
  39. [ \t\n]+                ;   /* Ignore whitespace */
  40.  
  41. .                       ;   /* Ignore other characters */
  42. %%
  43.  
  44. int main()
  45. {
  46.     yyin = fopen("var.c", "r");
  47.     if (!yyin)
  48.     {
  49.         printf("Error: Cannot open file");
  50.         return 1;
  51.     }
  52.     yylex();
  53.     fclose(yyin);
  54.     return 0;
  55. }
  56.  
  57. int yywrap()
  58. {
  59.     return 1;
  60. }
  61.  
Success #stdin #stdout #stderr 0.03s 6912KB
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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/l6cOcs/prog:1:4: Syntax error: Operator expected
ERROR: /home/l6cOcs/prog:60:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/g8KKTP
language:
Prolog (swi 7.6.4)
created:
12 hours ago
visibility:
public

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