/*
 *	aegis - project change supervisor
 *	Copyright (C) 1998, 1999 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 implement the dirname builtin function
 */

#include <ac/string.h>

#include <aer/expr.h>
#include <aer/func/dirname.h>
#include <aer/value/error.h>
#include <aer/value/string.h>
#include <error.h>
#include <mem.h>
#include <sub.h>


static int basename_verify _((rpt_expr_ty *));

static int
basename_verify(ep)
	rpt_expr_ty	*ep;
{
	return (ep->nchild == 1);
}


static rpt_value_ty *basename_run _((rpt_expr_ty *, size_t, rpt_value_ty **));

static rpt_value_ty *
basename_run(ep, argc, argv)
	rpt_expr_ty	*ep;
	size_t		argc;
	rpt_value_ty	**argv;
{
	rpt_value_ty	*arg;
	rpt_value_ty	*result;
	string_ty	*pathname;
	string_ty	*s;
	char		*cp;

	assert(argc == 1);
	arg = argv[0];
	assert(arg->method->type != rpt_value_type_error);
	arg = rpt_value_stringize(arg);
	if (arg->method->type != rpt_value_type_string)
	{
		sub_context_ty	*scp;

		scp = sub_context_new();
		rpt_value_free(arg);
		sub_var_set_charstar(scp, "Function", "basename");
		sub_var_set_charstar(scp, "Number", "1");
		sub_var_set_charstar(scp, "Name", argv[0]->method->name);
		s =
			subst_intl
			(
				scp,
    i18n("$function: argument $number: string value required (was given $name)")
			);
		sub_context_delete(scp);
		result = rpt_value_error(ep->pos, s);
		str_free(s);
		return result;
	}
	pathname = str_copy(rpt_value_string_query(arg));
	rpt_value_free(arg);

	/*
	 * extract the final path element
	 */
	cp = strrchr(pathname->str_text, '/');
	if (cp)
		s = str_from_c(cp + 1);
	else
		s = str_copy(pathname);
	str_free(pathname);

	/*
	 * build the result
	 */
	result = rpt_value_string(s);
	str_free(s);
	return result;
}


rpt_func_ty rpt_func_basename =
{
	"basename",
	1, /* optimizable */
	basename_verify,
	basename_run
};


static int dirname_verify _((rpt_expr_ty *));

static int
dirname_verify(ep)
	rpt_expr_ty	*ep;
{
	return (ep->nchild == 1);
}


static rpt_value_ty *dirname_run _((rpt_expr_ty *, size_t, rpt_value_ty **));

static rpt_value_ty *
dirname_run(ep, argc, argv)
	rpt_expr_ty	*ep;
	size_t		argc;
	rpt_value_ty	**argv;
{
	rpt_value_ty	*arg;
	rpt_value_ty	*result;
	string_ty	*f;
	string_ty	*d;
	char		*cp;

	assert(argc == 1);
	arg = argv[0];
	assert(arg->method->type != rpt_value_type_error);
	arg = rpt_value_stringize(arg);
	if (arg->method->type != rpt_value_type_string)
	{
		sub_context_ty	*scp;
		string_ty	*s;

		scp = sub_context_new();
		rpt_value_free(arg);
		sub_var_set_charstar(scp, "Function", "dirname");
		sub_var_set_charstar(scp, "Number", "1");
		sub_var_set_charstar(scp, "Name", argv[0]->method->name);
		s =
			subst_intl
			(
				scp,
    i18n("$function: argument $number: string value required (was given $name)")
			);
		sub_context_delete(scp);
		result = rpt_value_error(ep->pos, s);
		str_free(s);
		return result;
	}
	f = str_copy(rpt_value_string_query(arg));
	rpt_value_free(arg);

	/*
	 * extract the final path element
	 */
	cp = strrchr(f->str_text, '/');
	if (cp)
	{
		if (cp == f->str_text)
			d = str_from_c("/");
		else
			d = str_n_from_c(f->str_text, cp - f->str_text);
	}
	else
		d = str_from_c(".");
	str_free(f);

	/*
	 * build the result
	 */
	result = rpt_value_string(d);
	str_free(d);
	return result;
}


rpt_func_ty rpt_func_dirname =
{
	"dirname",
	1, /* optimizable */
	dirname_verify,
	dirname_run
};