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  1. /* program name is lexp.l */
  2. %{
  3. /* program to recognize a c program */
  4. int COMMENT=0;
  5. %}
  6. identifier [a-zA-Z][a-zA-Z0-9]*
  7. %%
  8. #.* { printf("\n%s is a PREPROCESSOR DIRECTIVE",yytext);}
  9. int |
  10. float |
  11. char |
  12. double |
  13. while |
  14. for |
  15. do |
  16. if |
  17. break |
  18. continue |
  19. void |
  20. switch |
  21. case |
  22. long |
  23. struct |
  24. const |
  25. typedef |
  26. return |
  27. else |
  28. goto {printf("\n\t%s is a KEYWORD",yytext);}
  29. "/*" {COMMENT = 1;}
  30. /*{printf("\n\n\t%s is a COMMENT\n",yytext);}*/
  31. "*/" {COMMENT = 0;}
  32.  
  33. /* printf("\n\n\t%s is a COMMENT\n",yytext);}*/
  34. {identifier}\( {if(!COMMENT)printf("\n\nFUNCTION\n\t%s",yytext);}
  35. \{ {if(!COMMENT) printf("\n BLOCK BEGINS");}
  36. \} {if(!COMMENT) printf("\n BLOCK ENDS");}
  37. {identifier}(\[[0-9]*\])? {if(!COMMENT) printf("\n %s IDENTIFIER",yytext);}
  38. \".*\" {if(!COMMENT) printf("\n\t%s is a STRING",yytext);}
  39. [0-9]+ {if(!COMMENT) printf("\n\t%s is a NUMBER",yytext);}
  40. \)(\;)? {if(!COMMENT) printf("\n\t");ECHO;printf("\n");}
  41. \( ECHO;
  42. = {if(!COMMENT)printf("\n\t%s is an ASSIGNMENT OPERATOR",yytext);}
  43. \<= |
  44. \>= |
  45. \< |
  46. == |
  47. \> {if(!COMMENT) printf("\n\t%s is a RELATIONAL OPERATOR",yytext);}
  48. %%
  49. int main(int argc,char **argv)
  50. {
  51. if (argc > 1)
  52. {
  53. FILE *file;
  54. file = fopen(argv[1],"r");
  55. if(!file)
  56. {
  57. printf("could not open %s \n",argv[1]);
  58. exit(0);
  59. }
  60. yyin = file;
  61. }
  62. yylex();
  63. printf("\n\n");
  64. return 0;
  65. } int yywrap()
  66.  
  67. {
  68. return 0;
  69.  
  70. }
Success #stdin #stdout #stderr 0.02s 6860KB
comments (?)
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/SPZHjS/prog:70:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/dPFsjJ
language:
Prolog (swi 7.6.4)
created:
3 days ago
visibility:
public

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