%{
#include <stdlib.h>
#include "expression.h"

int yylex();
int yyerror(void* scanner, void* lvalp, char* str);

%}

%pure-parser
%lex-param {void *scanner}
%parse-param {void *scanner} {union expression** root}

%union {
	union expression* exp;
}

%token WEBDICE_TOKEN_EOL
%token <exp> WEBDICE_TOKEN_CONST
%token <exp> WEBDICE_TOKEN_ROLL
%token WEBDICE_TOKEN_LPAREN
%token WEBDICE_TOKEN_RPAREN

%left WEBDICE_TOKEN_ADD
%left WEBDICE_TOKEN_SUB
%left WEBDICE_TOKEN_MUL
%left WEBDICE_TOKEN_DIV

%type <exp> expression

%start lines

%%
expression:	expression WEBDICE_TOKEN_ADD expression	{ $$ = webdice_add($1,$3); }
	|	expression WEBDICE_TOKEN_SUB expression	{ $$ = webdice_sub($1,$3); }
	|	expression WEBDICE_TOKEN_MUL expression	{ $$ = webdice_mul($1,$3); }
	|	expression WEBDICE_TOKEN_DIV expression	{ $$ = webdice_div($1,$3); }
	|	WEBDICE_TOKEN_CONST	{ $$ = $1; }
	|	WEBDICE_TOKEN_ROLL	{ $$ = $1; }
	|	WEBDICE_TOKEN_LPAREN expression WEBDICE_TOKEN_RPAREN	{ $$ = $2; }
	;

lines:
	|	lines WEBDICE_TOKEN_EOL	{}
	|	lines expression WEBDICE_TOKEN_EOL	{ (*root) = $2; }
	;

%%