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  1. %{
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. // Define token types for printing
  6. void print_token(const char* type, const char* lexeme) {
  7.     printf("Token: %-12s Lexeme: %s\n", type, lexeme);
  8. }
  9. %}
  10.  
  11. // Define keywords
  12. KEYWORD     (if|else|while|for|return|int|float|char|double|void)
  13.  
  14. // Define identifier: starts with letter or _, followed by letters, digits, or _
  15. ID          [a-zA-Z_][a-zA-Z0-9_]*
  16.  
  17. // Define number (integer only here)
  18. NUMBER      [0-9]+
  19.  
  20. // Operators (including multi-char)
  21. OPERATOR    (\+\+|--|==|!=|<=|>=|&&|\|\||[+\-*/%=<>!&|])
  22.  
  23. // Separators
  24. SEPARATOR   [\(\)\{\}\[\];,\.]
  25.  
  26. // Ignore whitespace (spaces, tabs, newlines)
  27. WHITESPACE  [ \t\n\r]+
  28.  
  29. %%
  30.  
  31. {WHITESPACE}    ;  // Ignore whitespace characters
  32.  
  33. {KEYWORD}       { print_token("Keyword", yytext); }
  34. {ID}            { print_token("Identifier", yytext); }
  35. {NUMBER}        { print_token("Number", yytext); }
  36. {OPERATOR}      { print_token("Operator", yytext); }
  37. {SEPARATOR}     { print_token("Separator", yytext); }
  38.  
  39. .               { printf("Unknown character: %s\n", yytext); }
  40.  
  41. %%
  42.  
  43. int main(int argc, char **argv)
  44. {
  45.     if (argc > 1) {
  46.         FILE *file = fopen(argv[1], "r");
  47.         if (!file) {
  48.             perror("Cannot open file");
  49.             return 1;
  50.         }
  51.         yyin = file;
  52.     }
  53.     yylex();
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout #stderr 0.03s 6776KB
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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/MrZWHm/prog:55:1: Syntax error: end_of_file_in_quasi_quotation
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/zcMHkH
language:
Prolog (swi 7.6.4)
created:
15 hours ago
visibility:
public

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