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/*
* $Id: $
* $Version: $
*
* Copyright (c) Tanel Tammet 2004,2005,2006,2007,2008,2009,2010
*
* Contact: tanel.tammet@gmail.com
*
* This file is part of WhiteDB
*
* WhiteDB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WhiteDB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WhiteDB. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** @file dbprolog.y
* Grammar rules for prolog parser
*
*/
%{
#include <stdio.h>
#include "dbprologparse.h"
#define DBPARM ((void*)(parm->db))
%}
/*
** 'pure_parser' tells bison to use no global variables and create a
** reentrant parser.
*/
/*%pure_parser*/
%pure-parser
%parse-param {parse_parm *parm}
%parse-param {void *scanner}
%lex-param {yyscan_t *scanner}
%token IS
%token ATOM
%token FLOAT
%token INT
%token NOT
%token VAR
%token FAIL
%left NOT
/* TODO: make these work
%left OR
%left AND
%nonassoc '<' '>' '=' LE GE NE
%left '+' '-'
%left '*' '/'
*/
%% /* Grammar rules and actions follow */
input: clauselist { $$ = MKWGPAIR(DBPARM,$1,MKWGNIL); }
;
clauselist: /* empty */ { $$ = MKWGNIL; }
| clause clauselist { $$ = MKWGPAIR(DBPARM,$1, $2); }
;
clause: fact { $$ = $1; }
| rule { $$ = $1; }
;
fact: functionform '.' { $$ = MKWGPAIR(DBPARM,$1, MKWGNIL); }
;
functionform: ATOM '(' arguments ')' { $$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,$1), $3); }
| NOT ATOM '(' arguments ')' { $$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"not"), MKWGPAIR(DBPARM,MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,$2), $4), MKWGNIL)); }
| '~' ATOM '(' arguments ')' { $$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"~"), MKWGPAIR(DBPARM,MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,$2), $4), MKWGNIL)); }
;
arguments: argument { $$ = MKWGPAIR(DBPARM,$1, MKWGNIL); }
| argument ',' arguments { $$ = MKWGPAIR(DBPARM,$1, $3); }
;
argument: functionform { $$ = $1; }
| ATOM { $$ = MKWGSTRING(DBPARM,$1); }
| INT { $$ = MKWGINT(DBPARM,$1); }
| FLOAT { $$ = MKWGSTRING(DBPARM,$1); }
| VAR { $$ = MKWGSTRING(DBPARM,$1); }
;
rule: functionform IS body '.' { $$ = MKWGPAIR(DBPARM,$1, $3); }
;
body: functionform { $$ = MKWGPAIR(DBPARM,MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"not"), MKWGPAIR(DBPARM,$1, MKWGNIL)), MKWGNIL); }
| functionform ',' body { $$ = MKWGPAIR(DBPARM,MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"not"), MKWGPAIR(DBPARM,$1, MKWGNIL)), $3); }
| functionform ';' body { $$ = MKWGPAIR(DBPARM,MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"and"), MKWGPAIR(DBPARM,$1, $3)), MKWGNIL); }
;
body: functionform { $$ = MKWGPAIR(DBPARM,$1, MKWGNIL); }
| orlist { $$ = $1; }
| andlist { $$ = $1; }
;
orlist: { $$ = MKWGNIL; }
| functionform ',' orlist { $$ = MKWGPAIR(DBPARM,$1, $3); }
| functionform ',' andlist { $$ = MKWGPAIR(DBPARM,$1, $3); }
;
andlist: { $$ = MKWGNIL; }
| functionform ';' andlist { $$ = MKWGPAIR(DBPARM,$1, $3); }
| functionform ';' orlist { $$ = MKWGPAIR(DBPARM,$1, $3); }
;
fact: atomargs '.' { $$ = $1; }
;
atomargs: ATOM '(' arguments ')' { $$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,$1), MKWGPAIR(DBPARM,$3, MKWGNIL)); }
;
rule: ATOM '(' arguments ')' IS body {$$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,$1), MKWGPAIR(DBPARM,$3, MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,":-"), $6))); }
;
arguments: argument { $$ = MKWGPAIR(DBPARM,$1, MKWGNIL); }
| argument ',' arguments { $$ = MKWGPAIR(DBPARM,$1, $3); }
;
body: terms '.' { $$ = $1; }
;
terms: term { $$ = $1; }
| term ',' terms { $$ = MKWGPAIR(DBPARM,MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"and"), MKWGPAIR(DBPARM,$1, $3)), MKWGNIL); }
| term ';' terms { $$ = MKWGPAIR(DBPARM,MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"or"), MKWGPAIR(DBPARM,$1, $3)), MKWGNIL); }
;
term: ATOM '(' term ')' { $$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,$1), MKWGPAIR(DBPARM,$3, MKWGNIL)); }
| NOT '(' term ')' { $$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"not"), $3); }
| atomargs { $$ = $1; }
| '!' { $$ = MKWGPAIR(DBPARM,MKWGSTRING(DBPARM,"cut"), MKWGNIL); }
;
%%
|
