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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. int yylineno = 1;
  6. FILE *yyin;
  7. %}
  8.  
  9. letter  [a-zA-Z]
  10. digit   [0-9]
  11.  
  12. %%
  13.  
  14. \n      { yylineno++; }
  15.  
  16. "#include<"{letter}+(\.{letter}+)?">" 
  17.         { printf("%d\t%s\tPREPROCESSOR\n", yylineno, yytext); }
  18.  
  19. [ \t]+  ;   /* Ignore spaces and tabs */
  20.  
  21. (return|main|for|while|case|switch|if|else)
  22.         { printf("%d\t%s\tKEYWORD\n", yylineno, yytext); }
  23.  
  24. (int|float|char|struct)
  25.         { printf("%d\t%s\tDATATYPE\n", yylineno, yytext); }
  26.  
  27. "("     { printf("%d\t%s\tBRACKET OPEN\n", yylineno, yytext); }
  28.  
  29. ")"     { printf("%d\t%s\tBRACKET CLOSE\n", yylineno, yytext); }
  30.  
  31. "{"     { printf("%d\t%s\tBRACE OPEN\n", yylineno, yytext); }
  32.  
  33. "}"     { printf("%d\t%s\tBRACE CLOSE\n", yylineno, yytext); }
  34.  
  35. {letter}({letter}|{digit})*
  36.         { printf("%d\t%s\tIDENTIFIER\n", yylineno, yytext); }
  37.  
  38. {digit}+ 
  39.         { printf("%d\t%s\tINTEGER\n", yylineno, yytext); }
  40.  
  41. {digit}+"E"(\+|\-)?{digit}+
  42.         { printf("%d\t%s\tREAL NUMBER\n", yylineno, yytext); }
  43.  
  44. {digit}+\.{digit}+(E(\+|\-)?{digit}+)?
  45.         { printf("%d\t%s\tFLOATING NUMBER\n", yylineno, yytext); }
  46.  
  47. "="     { printf("%d\t%s\tASSIGNMENT\n", yylineno, yytext); }
  48.  
  49. ";"     { printf("%d\t%s\tTERMINATOR\n", yylineno, yytext); }
  50.  
  51. \"({letter}|{digit}|[ ])*\"
  52.         { printf("%d\t%s\tSTRING CONSTANT\n", yylineno, yytext); }
  53.  
  54. .       ;   /* Ignore other characters */
  55.  
  56. %%
  57.  
  58. int yywrap()
  59. {
  60.     return 1;
  61. }
  62.  
  63. int main(int argc, char *argv[])
  64. {
  65.     if(argc < 2)
  66.     {
  67.         printf("Usage: %s <inputfile>\n", argv[0]);
  68.         return 1;
  69.     }
  70.  
  71.     yyin = fopen(argv[1], "r");
  72.  
  73.     if(yyin == NULL)
  74.     {
  75.         printf("Cannot open file\n");
  76.         return 1;
  77.     }
  78.  
  79.     printf("LINE\tLEXEME\tTOKEN\n");
  80.  
  81.     yylex();
  82.  
  83.     fclose(yyin);
  84.     return 0;
  85. }
Success #stdin #stdout #stderr 0.03s 6816KB
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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/CnFudo/prog:2:1: Syntax error: Operator expected
ERROR: /home/CnFudo/prog:85:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/5hUZj2
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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