%{
	#include <prototypes.h>
	#include "parser.h"
	int column = 0;
	int c;
%}

D						[0-9]
L						[a-zA-Z_]
H						[a-fA-F0-9]
E						[Ee][+-]?{D}+
FS						(f|F|l|L)
IS						(u|U|l|L)*

%%
"/*"           			{ comment(); }
"#include <"			{ c = input(); while ( c != '>') c = input();  }
"#include \""			{ c = input(); while ( c != '\"') c = input(); }

"auto"					{ count(); return(AUTO); }
"break"					{ count(); return(BREAK); }
"case"					{ count(); return(CASE); }
"char"					{ count(); return(CHAR); }
"const"					{ count(); return(CONST); }
"continue"				{ count(); return(CONTINUE); }
"default"				{ count(); return(DEFAULT); }
"do"					{ count(); return(DO); }
"double"				{ count(); return(DOUBLE); }
"else"					{ count(); return(ELSE); }
"enum"					{ count(); return(ENUM); }
"extern"				{ count(); return(EXTERN); }
"float"					{ count(); return(FLOAT); }
"for"					{ count(); return(FOR); }
"goto"					{ count(); return(GOTO); }
"if"					{ count(); return(IF); }
"int"					{ count(); return(INT); }
"long"					{ count(); return(LONG); }
"register"				{ count(); return(REGISTER); }
"return"				{ count(); return(RETURN); }
"short"					{ count(); return(SHORT); }
"signed"					{ count(); return(SIGNED); }
"sizeof"				{ count(); return(SIZEOF); }
"static"				{ count(); return(STATIC); }
"struct"				{ count(); return(STRUCT); }
"switch"				{ count(); return(SWITCH); }
"typedef"				{ count(); return(TYPEDEF); }
"union"					{ count(); return(UNION); }
"unsigned"				{ count(); return(UNSIGNED); }
"void"					{ count(); return(VOID); }
"volatile"				{ count(); return(VOLATILE); }
"while"					{ count(); return(WHILE); }

{L}({L}|{D})*			{ count(); return(check_type()); }
0[xX]{H}+{IS}?			{ count(); return(CONSTANT); }
0{D}+{IS}?				{ count(); return(CONSTANT); }
{D}+{IS}?				{ count(); return(CONSTANT); }
'(\\.|[^\\'])+'			{ count(); return(CONSTANT); }

{D}+{E}{FS}?			{ count(); return(CONSTANT); }
{D}*"."{D}+({E})?{FS}?	{ count(); return(CONSTANT); }
{D}+"."{D}*({E})?{FS}?	{ count(); return(CONSTANT); }

\"(\\.|[^\\"])*\"		{ count(); return(STRING_LITERAL); }

">>="					{ count(); return(RIGHT_ASSIGN); }
"<<="					{ count(); return(LEFT_ASSIGN); }
"+="					{ count(); return(ADD_ASSIGN); }
"-="					{ count(); return(SUB_ASSIGN); }
"*="					{ count(); return(MUL_ASSIGN); }
"/="					{ count(); return(DIV_ASSIGN); }
"%="					{ count(); return(MOD_ASSIGN); }
"&="					{ count(); return(AND_ASSIGN); }
"^="					{ count(); return(XOR_ASSIGN); }
"|="					{ count(); return(OR_ASSIGN); }
">>"					{ count(); return(RIGHT_OP); }
"<<"					{ count(); return(LEFT_OP); }
"++"					{ count(); return(INC_OP); }
"--"					{ count(); return(DEC_OP); }
"->"					{ count(); return(PTR_OP); }
"&&"					{ count(); return(AND_OP); }
"||"					{ count(); return(OR_OP); }
"<="					{ count(); return(LE_OP); }
">="					{ count(); return(GE_OP); }
"=="					{ count(); return(EQ_OP); }
"!="					{ count(); return(NE_OP); }
";"						{ count(); return(';'); }
"{"						{ count(); return('{'); }
"}"						{ count(); return('}'); }
","						{ count(); return(','); }
":"						{ count(); return(':'); }
"="						{ count(); return('='); }
"("						{ count(); return('('); }
")"						{ count(); return(')'); }
"["						{ count(); return('['); }
"]"						{ count(); return(']'); }
"."						{ count(); return('.'); }
"&"						{ count(); return('&'); }
"!"						{ count(); return('!'); }
"~"						{ count(); return('~'); }
"-"						{ count(); return('-'); }
"+"						{ count(); return('+'); }
"*"						{ count(); return('*'); }
"/"						{ count(); return('/'); }
"%"						{ count(); return('%'); }
"<"						{ count(); return('<'); }
">"						{ count(); return('>'); }
"^"						{ count(); return('^'); }
"|"						{ count(); return('|'); }
"?"						{ count(); return('?'); }

[ \t\v\n\f]				{ count(); }
.						{ printf ("Unknown Token: %s\n", yytext); }
%%

int yywrap()
{
	/* stop after eof */
	return 1;
}

int count()
{
	int i;

	for (i = 0; yytext[i] != '\0'; i++)
		if (yytext[i] == '\n')
			column = 0;
		else if (yytext[i] == '\t')
			column += 4 - (column % 4);
		else
			column++;

	return column;
}

int check_type()
{
	return IDENTIFIER;
}

void comment() 
{
	int c;

	c = input(); 
	do { 
		while ( c != '*') 
			c = input();
		c=input();
	} while(c != '/');
}