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  1. %option noyywrap
  2.  
  3. %{
  4. #include <stdio.h>
  5.  
  6. // Start condition states
  7. %}
  8.  
  9. %x PREINC PREDEC POSTINC POSTDEC
  10.  
  11. DIGIT        [0-9]
  12. ID           [a-zA-Z_][a-zA-Z0-9_]*
  13. KEYWORD      "for"|"int"|"float"|"char"|"if"|"else"|"while"|"return"|"void"
  14. PUNCT        ";"|"{"|"}"|","
  15. INT_CONST    {DIGIT}+
  16. FLOAT_CONST  {DIGIT}+"."{DIGIT}+
  17. STR_LITERAL  \"([^\\\"]|\\.)*\"
  18. CHAR_LITERAL \'([^\\\']|\\.)\'
  19. PARANTHESIS  "("
  20. CLOS         ")"
  21.  
  22. %%
  23.  
  24. {KEYWORD}             { printf("Keyword: %s\n", yytext); }
  25.  
  26. "++"                  { BEGIN(PREINC); return 0; }
  27. "--"                  { BEGIN(PREDEC); return 0; }
  28. {ID}"++"              { printf("Post Increment: %s\n", yytext); return 0; }
  29. {ID}"--"              { printf("Post Decrement: %s\n", yytext); return 0; }
  30.  
  31. <PREINC>{ID}          { printf("Pre Increment: ++%s\n", yytext); BEGIN(INITIAL); return 0; }
  32. <PREDEC>{ID}          { printf("Pre Decrement: --%s\n", yytext); BEGIN(INITIAL); return 0; }
  33.  
  34. {FLOAT_CONST}         { printf("Float Constant: %s\n", yytext); }
  35. {INT_CONST}           { printf("Integer Constant: %s\n", yytext); }
  36. {STR_LITERAL}         { printf("String Literal: %s\n", yytext); }
  37. {CHAR_LITERAL}        { printf("Character Literal: %s\n", yytext); }
  38.  
  39. "=="|"!="|"="|"<="|">="|"<"|">" { printf("Relational Operator: %s\n", yytext); }
  40. "*"|"/"|"+"|"-"                 { printf("Arithmetic Operator: %s\n", yytext); }
  41.  
  42. {PUNCT}              { printf("Punctuator: %s\n", yytext); }
  43. {ID}                 { printf("Identifier: %s\n", yytext); }
  44. [ \t\n]              ;  // ignore whitespaces
  45.  
  46. .                    { printf("Unrecognized: %s\n", yytext); }
  47.  
  48. %%
  49.  
  50. int main() {
  51.     printf("Enter C-style code:\n");
  52.     yylex();
  53.     return 0;
  54. }
  55.  
Success #stdin #stdout #stderr 0.03s 6932KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/0LaGds/prog:4:1: Syntax error: Operator expected
ERROR: /home/0LaGds/prog:54:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/8SF2M6
language:
Prolog (swi 7.6.4)
created:
3 days ago
visibility:
public

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