parser/scanner.lex

   1         #include <stdio.h>
   2         #include <stdlib.h>
   3         #include <string.h>
   4         #include "parser.h"
   5
   6 KEYWORD struct|end|method|var|if|then|else|while|do|return|not|or|this
   7 SPECIAL_CHAR \;|\(|\)|\:=|\.|\-|\*|\<|\=|\,
   8 IDENTIFIER [a-zA-Z_][0-9a-zA-Z_]*
   9 NUMBER_HEX 0x[0-9A-Fa-f]+
  10 NUMBER_DEC [0-9]+
  11 WHITESPACE [\t\n\r ]
  12 COMMENT_START \/\*
  13 COMMENT_END     \*\/
  14
  15 %x COMMENT
  16 %option yylineno
  17 %%
  18
  19 {COMMENT_START} BEGIN(COMMENT);
  20
  21 <COMMENT>{COMMENT_END} BEGIN(INITIAL);
  22
  23 <COMMENT><<EOF>> {
  24         fprintf(stderr, "Kommentar nicht geschlossen\n");
  25         exit(1);
  26 }
  27
  28 <COMMENT>(.|\n) /* alles im kommentar wird ignoriert */
  29
  30 struct return(STRUCT);
  31 end return(END);
  32 method return(METHOD);
  33 var return(VAR);
  34 if return(IF);
  35 then return(THEN);
  36 else return(ELSE);
  37 while return(WHILE);
  38 do return(DO);
  39 return return(RETURN);
  40 not return(NOT);
  41 or return(OR);
  42 this return(THIS);
  43
  44 {IDENTIFIER} return(IDENT);
  45
  46 {NUMBER_DEC} return(NUM);
  47 {NUMBER_HEX} return(NUM);
  48
  49 {SPECIAL_CHAR} return(*yytext);
  50
  51 {WHITESPACE} /* ignore */
  52
  53 . {
  54                 fprintf(stderr, "Lexical error on line %i\n", yylineno);
  55                 exit(1);
  56 }
  57
  58 %%
  59