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  1. %{
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. int lineno = 1;
  6. %}
  7.  
  8. %%
  9. "int"       { printf("Keyword: %s\n", yytext); }
  10. "float"     { printf("Keyword: %s\n", yytext); }
  11. "if"        { printf("Keyword: %s\n", yytext); }
  12. "else"      { printf("Keyword: %s\n", yytext); }
  13. "return"    { printf("Keyword: %s\n", yytext); }
  14.  
  15. [0-9]+      { printf("Constant: %s\n", yytext); }
  16. [a-zA-Z_][a-zA-Z0-9_]* { printf("Identifier: %s\n", yytext); }
  17.  
  18. "=="        { printf("Operator: %s\n", yytext); }
  19. "="         { printf("Operator: %s\n", yytext); }
  20. "+"         { printf("Operator: %s\n", yytext); }
  21. "-"         { printf("Operator: %s\n", yytext); }
  22. "*"         { printf("Operator: %s\n", yytext); }
  23. "/"         { printf("Operator: %s\n", yytext); }
  24.  
  25. ";"         { printf("Delimiter: %s\n", yytext); }
  26. ","         { printf("Delimiter: %s\n", yytext); }
  27. "("         { printf("Delimiter: %s\n", yytext); }
  28. ")"         { printf("Delimiter: %s\n", yytext); }
  29. "{"         { printf("Delimiter: %s\n", yytext); }
  30. "}"         { printf("Delimiter: %s\n", yytext); }
  31.  
  32. [\n]        { lineno++; }
  33. [ \t]       { /* skip whitespace */ }
  34. .           { printf("Unknown token: %s\n", yytext); }
  35. %%
  36.  
  37. int main() {
  38.     yylex();
  39.     return 0;
  40. }
  41.  
  42. int yywrap() {
  43.     return 1;
  44. }
  45.  
Success #stdin #stdout #stderr 0.03s 6892KB
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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/h1ixin/prog:2:1: Syntax error: Operator expected
ERROR: /home/h1ixin/prog:44:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/sIx4e1
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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