/*
 *	aegis - project change supervisor
 *	Copyright (C) 1997, 1999, 2002, 2003 Peter Miller;
 *	All rights reserved.
 *
 *	This program 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 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program 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 this program; if not, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate match tree nodes
 */

#include <aer/value/boolean.h>
#include <aer/value/error.h>
#include <aer/value/string.h>
#include <gmatch.h>
#include <str.h>
#include <sub.h>
#include <tree/match.h>
#include <tree/diadic.h>


static rpt_value_ty *
match_evaluate(tree_ty *tp, string_ty *path, struct stat *st)
{
    tree_diadic_ty  *this_thing;
    rpt_value_ty    *v1;
    rpt_value_ty    *v1s;
    rpt_value_ty    *v2;
    rpt_value_ty    *v2s;
    rpt_value_ty    *result;

    this_thing = (tree_diadic_ty *)tp;

    v1 = tree_evaluate(this_thing->left, path, st);
    v1s = rpt_value_stringize(v1);
    v2 = tree_evaluate(this_thing->right, path, st);
    v2s = rpt_value_stringize(v2);

    if
    (
	v1s->method->type == rpt_value_type_string
    &&
	v2s->method->type == rpt_value_type_string
    )
    {
	result =
    	    rpt_value_boolean
    	    (
       		gmatch
       		(
	  	    rpt_value_string_query(v1s)->str_text,
	  	    rpt_value_string_query(v2s)->str_text
       		)
    	    );
    }
    else
    {
	sub_context_ty	*scp;
	string_ty	*s;

	scp = sub_context_new();
	sub_var_set_charstar(scp, "Name1", v1->method->name);
	sub_var_set_charstar(scp, "Name2", v2->method->name);
	s = subst_intl(scp, i18n("illegal match ($name1 ~ $name2)"));
	sub_context_delete(scp);
	result = rpt_value_error(0, s);
	str_free(s);
    }
    rpt_value_free(v1);
    rpt_value_free(v2);
    rpt_value_free(v1s);
    rpt_value_free(v2s);
    return result;
}


static tree_method_ty match_method =
{
    sizeof(tree_diadic_ty),
    "~",
    tree_diadic_destructor,
    tree_diadic_print,
    match_evaluate,
    tree_diadic_useful,
    tree_diadic_constant,
    tree_diadic_optimize,
};


tree_ty *
tree_match_new(tree_ty *left, tree_ty *right)
{
    return tree_diadic_new(&match_method, left, right);
}
