%{
#include <iostream>
#include <FlexLexer.h>

#include "expr.hpp"

#define YYDEBUG 1

FlexLexer* lexer = NULL;
inline int yylex() { return lexer->yylex(); }

int yyerror(const char *s){
	extern int yychar;
	printf("yyerror:%s token:%d yytext:%s\n", s, yychar, lexer->YYText());
	return -1;
}

%}

%union {
	Expr* expr;
}
%token <expr> INTE
%left '+' '-' '*' '/' '%'
%type <expr> expr
%%
line_list
	: line
	| line_list line
;
line
	: '\n'
	| expr '\n' {$1->to_bytecode();}
	| error '\n'	{yyclearin; yyerrok;}
;
expr
	: INTE
	| expr '+' expr {
		Oper* oper = new Oper(ADD);
		oper->left = $1;
		oper->right = $3;
		$$ = oper;
	}
	| expr '-' expr {
		Oper* oper = new Oper(SUB);
		oper->left = $1;
		oper->right = $3;
		$$ = oper;
	}
	| expr '*' expr {
		Oper* oper = new Oper(MUL);
		oper->left = $1;
		oper->right = $3;
		$$ = oper;
	}
	| expr '/' expr {
		Oper* oper = new Oper(DIV);
		oper->left = $1;
		oper->right = $3;
		$$ = oper;
	}
	| expr '%' expr {
		Oper* oper = new Oper(MOD);
		oper->left = $1;
		oper->right = $3;
		$$ = oper;
	}
	| '(' expr ')' {$$ = $2;}
;
%%

int main(int argc, char **argv){
	lexer = new yyFlexLexer;
	return yyparse();
}