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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. %}
  5. %%
  6. // Regular Expressions (token definitions)
  7. int     [a-zA-Z_][a-zA-Z0-9_]*
  8. float   [0-9]+\.[0-9]+
  9. digit   [0-9]+
  10. keyword int|float|if|else|for|while|return
  11. %%
  12. // Rules and actions
  13. {keyword}      {printf("Token: %s | Type: KEYWORD\n", yytext); }
  14. {int}      {printf("Token: %s | Type: IDENTIFIER\n", yytext); }
  15. {float}      {printf("Token: %s | Type: CONSTANT\n", yytext); }
  16. {digit}      {printf("Token: %s | Type: CONSTANT\n", yytext); }
  17. "+"|"-"|"*"|"/" { printf("Token: %s | Type: OPERATOR\n", yytext); }
  18. "(" | ")" | ";" | "," { printf("Token: %s | Type: PUNCTUATION\n", yytext); }
  19. "//".*   {printf("Token: %s | Type: COMMENT\n", yytext); }
  20. "/*".* "*/"     {printf("Token: %s | Type: COMMENT\n", yytext); }
  21. [ \t\n\r]+   { /* Ignore whitespace */ }
  22.  
  23. .               { printf("Token: %s | Type: UNKNOWN\n", yytext); }
  24. %%
  25.  
  26. int main() {
  27. yylex();  // Invoke the lexical analyzer
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout #stderr 0.03s 6952KB
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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/Gkv6QB/prog:2:1: Syntax error: Operator expected
ERROR: /home/Gkv6QB/prog:29:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/VBrjg2
language:
Prolog (swi 7.6.4)
created:
24 days ago
visibility:
public

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