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  1. %{
  2. int COMMENT=0;
  3. %}
  4. identifier [a-zA-Z][a-zA-Z0-9]*
  5. %%
  6. #.* {printf("\n%s is a preprocessor directive",yytext);}
  7. int |
  8. float |
  9. char |
  10. double |
  11. while |
  12. for |
  13. struct |
  14. typedef |
  15. do |
  16. if |
  17. break |
  18. continue |
  19. void |
  20. switch |
  21. return |
  22. else |
  23. goto {printf(" kwd");}
  24. "/*" {COMMENT=1;}{printf("comment");}
  25. \+ {if(!COMMENT)printf(" op-plus");}
  26. \- {if(!COMMENT)printf(" op-sub");}
  27. \* {if(!COMMENT)printf(" op-mul");}
  28. \/ {if(!COMMENT)printf(" op-div");}
  29. {identifier}\( {if(!COMMENT)printf("fun");}
  30. \{  {if(!COMMENT)printf("block begins");}
  31. \}  {if(!COMMENT)printf("block ends");}
  32. {identifier}(\[[0-9]*\])? {if(!COMMENT) printf(" id");}
  33.  
  34. \".*\" {if(!COMMENT)printf("str");}
  35. [0-9]+ {if(!COMMENT) printf("num");}
  36. \)(\:)? {if(!COMMENT)printf("\n\t");ECHO;printf("\n");}
  37. \( ECHO;
  38. = {if(!COMMENT)printf(" op-equ");}
  39. \<= |
  40. \>= |
  41. \< |
  42. == |
  43. \> {if(!COMMENT) printf("rel-op");}
  44.  
  45. %%
  46.  
  47.  
  48. int main(int argc, char **argv)
  49. {
  50. FILE *file;
  51. file=fopen("input.c","r");
  52. if(!file)
  53. {
  54. printf("could not open the file");
  55. exit(0);
  56. }
  57. yyin=file;
  58. yylex();
  59. printf("\n");
  60. return(0);
  61. }
  62. int yywrap()
  63. {
  64. return(1);
  65. }
Success #stdin #stdout #stderr 0.02s 6792KB
comments (?)
stdin
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int a+ b
stdout
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Standard output is empty
stderr
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ERROR: /home/0akw3c/prog:2:1: Syntax error: End of file in quoted string
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/GyEm0E
language:
Prolog (swi 7.6.4)
created:
1 year ago
visibility:
public

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