#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include "parser.h"

KEYWORD		func|end|struct|var|if|then|else|while|do|return|or|not
SPECIAL_CHAR	\;|\.|\(|\)|\,|\:=|\-|\+|\*|>=|=
IDENTIFIER	[[:alpha:]_][[:alnum:]_]*
NUMBER_HEX	[0-9][0-9A-Fa-f]*H
NUMBER_DEC	[0-9]+
WHITESPACE	[\t\n\r ]
COMMENT_START	\(\*
COMMENT_END	\*\)

%x COMMENT
%option yylineno
%%

{COMMENT_START}			BEGIN(COMMENT);

<COMMENT>{COMMENT_END}		BEGIN(INITIAL);

<COMMENT>{COMMENT_START}	fprintf(stderr, "Possibly nested comment on line %i\n", yylineno);

<COMMENT><<EOF>>		{ fprintf(stderr, "Unterminated comment.\n"); exit(1); }

<COMMENT>{WHITESPACE}		/* ignore */

<COMMENT>.			/* ignore everything inside comment */

func				return(FUNC);
end				return(END);
struct				return(STRUCT);
var				return(VAR);
if				return(IF);
then				return(THEN);
else				return(ELSE);
while				return(WHILE);
do				return(DO);
return				return(RETURN);
or				return(OR);
not				return(NOT);

{IDENTIFIER}			return(ID);

{NUMBER_DEC}			return(NUM);
{NUMBER_HEX}			return(NUM);
				
\:=				return(ASSIGN);
>=				return(GREATER);
{SPECIAL_CHAR}			return(yytext[0]);

{WHITESPACE}			/* ignore */

.				{ fprintf(stderr, "Lexical error on line %i\n", yylineno); exit(1); }

%%