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/*
 *	cook - file construction tool
 *	Copyright (C) 1991, 1992, 1993, 1994, 1997, 1999, 2001 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 the symbol table
 */

#include <ac/stddef.h>
#include <ac/stdlib.h>

#include <id/global.h>
#include <id/private.h>
#include <id/variable.h>
#include <mem.h>
#include <option.h>
#include <progname.h>
#include <version-stmp.h>
#include <str_list.h>
#include <symtab.h>
#include <trace.h>

string_ty	*id_need;
string_ty	*id_younger;
string_ty	*id_target;
string_ty	*id_targets;
string_ty	*id_search_list;


/*
 * NAME
 *	id_initialize - start up symbol table
 *
 * SYNOPSIS
 *	void id_initialize(void);
 *
 * DESCRIPTION
 *	The id_initialize function is used to create the hash table.
 *
 * RETURNS
 *	void
 *
 * CAVEAT
 *	Assumes the str_initialize function has been called already.
 */

void
id_initialize()
{
	trace(("init\n"));
	id_need = str_from_c("need");
	id_younger = str_from_c("younger");
	id_target = str_from_c("target");
	id_targets = str_from_c("targets");
	id_search_list = str_from_c("search_list");

	id_reset();
}


void
id_reset()
{
	string_list_ty	wl;
	string_ty	*s;

	id_global_reset();

	/*
	 * set the "version" predefined variable
	 */
	string_list_constructor(&wl);
	s = str_from_c(version_stamp());
	string_list_append(&wl, s);
	str_free(s);
	s = str_from_c("version");
	symtab_assign(id_global_stp(), s, id_variable_new(&wl));
	str_free(s);
	string_list_destructor(&wl);

	/*
	 * set the "self" predefined variable
	 */
	s = str_from_c(progname_get());
	string_list_append(&wl, s);
	str_free(s);
	s = str_from_c("self");
	symtab_assign(id_global_stp(), s, id_variable_new(&wl));
	str_free(s);
	string_list_destructor(&wl);

#ifdef __STDC__
	/*
	 * This symbol is only defined if we have a conforming C
	 * compiler.  This is support for the C recipes.
	 */
	string_list_append(&wl, str_true);
	s = str_from_c("__STDC__");
	symtab_assign(id_global_stp(), s, id_variable_new(&wl));
	str_free(s);
	string_list_destructor(&wl);
#endif

	/*
	 * set the default search list
	 * in the "search_list" predefined variable
	 */
	s = str_from_c(".");
	string_list_append(&wl, s);
	str_free(s);
	symtab_assign(id_global_stp(), id_search_list, id_variable_new(&wl));
	string_list_destructor(&wl);
}


int
id_interpret(idp, ocp, pp)
	id_ty		*idp;
	struct opcode_context_ty *ocp;
	const struct expr_position_ty *pp;
{
	assert(idp);
	assert(idp->method);
	assert(idp->method->interpret);
	return idp->method->interpret(idp, ocp, pp);
}


int
id_interpret_script(idp, ocp, pp)
	id_ty		*idp;
	struct opcode_context_ty *ocp;
	const struct expr_position_ty *pp;
{
	assert(idp);
	assert(idp->method);
	assert(idp->method->script);
	return idp->method->script(idp, ocp, pp);
}