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  1. //Implementation of Lexical Analyzer using Lex tool
  2. %{
  3. int COMMENT=0;
  4. %}
  5. identifier [a-zA-Z][a-zA-Z0-9]*
  6. %%
  7. #.* {printf("\n%s is a preprocessor directive",yytext);}
  8. int |
  9. float |
  10. char |
  11. double |
  12. while |
  13. for |
  14. struct |
  15. typedef |
  16. do |
  17. if |
  18. break |
  19. continue |
  20. void |
  21. switch |
  22. return |
  23. else |
  24. goto {printf("\n\t%s is a keyword",yytext);}
  25. "/*" {COMMENT=1;}{printf("\n\t %s is a COMMENT",yytext);}
  26. {identifier}\( {if(!COMMENT)printf("\nFUNCTION \n\t%s",yytext);}
  27. \{  {if(!COMMENT)printf("\n BLOCK BEGINS");}
  28. \}  {if(!COMMENT)printf("BLOCK ENDS ");}
  29. {identifier}(\[[0-9]*\])? {if(!COMMENT) printf("\n %s IDENTIFIER",yytext);}
  30. \".*\" {if(!COMMENT)printf("\n\t %s is a STRING",yytext);}
  31. [0-9]+ {if(!COMMENT) printf("\n %s is a NUMBER ",yytext);}
  32. \)(\:)? {if(!COMMENT)printf("\n\t");ECHO;printf("\n");}
  33. \( ECHO;
  34. = {if(!COMMENT)printf("\n\t %s is an ASSIGNMENT OPERATOR",yytext);}
  35. \<= |
  36. \>= |
  37. \< |
  38. == |
  39. \> {if(!COMMENT) printf("\n\t%s is a RELATIONAL OPERATOR",yytext);}
  40. %%
  41. int main(int argc, char **argv)
  42. {
  43. FILE *file;
  44. file=fopen("var.c","r");
  45. if(!file)
  46. {
  47. printf("could not open the file");
  48. exit(0);
  49. }
  50. yyin=file;
  51. yylex();
  52. printf("\n");
  53. return(0);
  54. }
  55. int yywrap()
  56. {
  57. return(1);
  58. }
Success #stdin #stdout #stderr 0.02s 6956KB
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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/6KcmVJ/prog:58:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/I0rMgW
language:
Prolog (swi 7.6.4)
created:
1 year ago
visibility:
public

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