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  1. %{
  2. #include "y.tab.h"
  3. %}
  4.  
  5. digit   [0-9]
  6. id      [a-zA-Z_][a-zA-Z0-9_]*
  7.  
  8. %%
  9.  
  10. "if"                { return IF; }
  11. "else"              { return ELSE; }
  12. "while"             { return WHILE; }
  13. "read"              { return READ; }
  14. "print"             { return PRINT; }
  15. {id}                { yylval.strval = strdup(yytext); return IDENTIFIER; }
  16. {digit}+            { yylval.numval = atoi(yytext); return NUMBER; }
  17. "/"                 { return DIVIDE; }
  18. "="                 { return ASSIGN; }
  19. "=="                { return EQUAL; }
  20. "!="                { return NOTEQUAL; }
  21. "<"                 { return LESS; }
  22. ">"                 { return GREATER; }
  23. "<="                { return LESSEQ; }
  24. ">="                { return GREATEREQ; }
  25. "{"                 { return LBRACE; }
  26. "}"                 { return RBRACE; }
  27. "("                 { return LPAREN; }
  28. ")"                 { return RPAREN; }
  29. ";"                 { return SEMICOLON; }
  30. [ \t\n]+            ;   // Skip whitespace
  31. .                   { return yytext[0]; }
  32.  
  33. %%
  34.  
  35. int yywrap() {
  36.     return 1;
  37. }
  38.  
Success #stdin #stdout #stderr 0.04s 6944KB
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Standard input is empty
stdout
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Standard output is empty
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ERROR: /home/VDkmU3/prog:2:1: Syntax error: Operator expected
ERROR: /home/VDkmU3/prog:37:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/xHnaqB
language:
Prolog (swi 7.6.4)
created:
10 days ago
visibility:
public

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