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  1. /* Define tokens */
  2. %{
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. #include <string.h>
  6. %}
  7.  
  8. %%
  9.  
  10. /* Define patterns and corresponding actions */
  11. "STORE"          { printf("STORE\n"); }
  12. "LOAD"           { printf("LOAD\n"); }
  13. "MACRO"          { printf("MACRO\n"); }
  14. "MEND"           { printf("MEND\n"); }
  15. "ADD"            { printf("ADD\n"); }
  16. "DIV"            { printf("DIV\n"); }
  17. "END"            { printf("END\n"); }
  18. [a-zA-Z_][a-zA-Z0-9_]*   { printf("ID: %s\n", yytext); }
  19. [0-9]+          { printf("NUM: %s\n", yytext); }
  20. [ \t\n]         { /* Ignore whitespace and newline characters */ }
  21.  
  22. %%
  23.  
  24. int main(int argc, char* argv[]) {
  25.     /* Open input file */
  26.     FILE* fp = fopen(argv[1], "r");
  27.     if (fp == NULL) {
  28.         perror("Error opening file");
  29.         exit(EXIT_FAILURE);
  30.     }
  31.  
  32.     /* Set input file */
  33.     yyin = fp;
  34.  
  35.     /* Call the lexer */
  36.     yylex();
  37.  
  38.     /* Close input file */
  39.     fclose(fp);
  40.  
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout #stderr 0.03s 6956KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/EyPd0u/prog:42:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/rfXEsX
language:
Prolog (swi 7.6.4)
created:
21 days ago
visibility:
public

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