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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <math.h>
  5.  
  6. FILE *yyin;
  7. %}
  8.  
  9. digit [0-9]
  10. id [A-Za-z][A-Za-z0-9]*
  11. li\"[^\"]*\"   // Define a string literal pattern
  12.  
  13. %%
  14.  
  15. void|main|int|printf             { printf("\nA keyword: %s\n", yytext); }
  16. {digit}+                         { printf("\nAn integer: %s (%d)\n", yytext, atoi(yytext)); }
  17. {digit}+"."{digit}*              { printf("\nA float: %s (%g)\n", yytext, atof(yytext)); }
  18. {id}                             { printf("\nAn identifier: %s\n", yytext); }
  19. "+"|"-"|"*"|"/"|"="              { printf("\nAn operator: %s\n", yytext); }
  20. ";"|"("|")"|":"|","|"}"|"{"     { printf("\n%s is a punctuation\n", yytext); }
  21. #{id}"<"{id}"."{id}">"           { printf("\n%s is a preprocessor directive\n", yytext); }
  22. {li}"%"{id}+{li}                 { printf("\n%s is a literal string\n", yytext); }
  23. {li}{id}+{li}                    { printf("\n%s is a literal string\n", yytext); }
  24.  
  25. %%
  26.  
  27. int main(int argc, char **argv) {
  28.     if (argc > 1) {
  29.         yyin = fopen(argv[1], "r");
  30.         if (yyin == NULL) {
  31.             printf("Cannot open file %s\n", argv[1]);
  32.             return 1;
  33.         }
  34.     } else {
  35.         yyin = stdin;
  36.     }
  37.  
  38.     yylex();  // Call the lexer to process the input file or stdin
  39.  
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout #stderr 0.03s 6932KB
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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/a8KvKE/prog:41:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/fCrVFN
language:
Prolog (swi 7.6.4)
created:
3 days ago
visibility:
public

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