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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. %}
  5.  
  6. %%
  7.  
  8. // Define tokens
  9. [0-9]+          { printf("NUMBER: %s\n", yytext); }
  10. [ \t\n]+       { /* ignore whitespace */ }
  11. "if"           { printf("KEYWORD: %s\n", yytext); }
  12. "else"         { printf("KEYWORD: %s\n", yytext); }
  13. [a-zA-Z_][a-zA-Z0-9_]* { printf("IDENTIFIER: %s\n", yytext); }
  14. "+"            { printf("OPERATOR: %s\n", yytext); }
  15. "-"            { printf("OPERATOR: %s\n", yytext); }
  16. "*"            { printf("OPERATOR: %s\n", yytext); }
  17. "/"            { printf("OPERATOR: %s\n", yytext); }
  18. "="            { printf("ASSIGNMENT: %s\n", yytext); }
  19. ";"            { printf("SEMICOLON: %s\n", yytext); }
  20. .              { printf("UNKNOWN: %s\n", yytext); }
  21.  
  22. %%
  23.  
  24. // Main function
  25. int main(int argc, char **argv) {
  26.     yylex();
  27.     return 0;
  28. }
  29.  
  30. // Error handling
  31. void yyerror(const char *s) {
  32.     fprintf(stderr, "Error: %s\n", s);
  33. }
Success #stdin #stdout #stderr 0.02s 6976KB
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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/Dctx2G/prog:2:1: Syntax error: Operator expected
ERROR: /home/Dctx2G/prog:33:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/PBt5z2
language:
Prolog (swi 7.6.4)
created:
6 days ago
visibility:
public

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