/*
 *	aegis - project change supervisor
 *	Copyright (C) 1994-1996, 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 implement the builtin print function
 */

#include <aer/expr.h>
#include <aer/func/print.h>
#include <aer/value/void.h>
#include <aer/value/error.h>
#include <aer/value/string.h>
#include <col.h>
#include <error.h>
#include <mem.h>
#include <os.h>
#include <output.h>
#include <sub.h>


int		rpt_func_print__ncolumns;
int		rpt_func_print__ncolumns_max;
output_ty	**rpt_func_print__column;
col_ty		*rpt_func_print__colp;


static int verify _((rpt_expr_ty *));

static int
verify(ep)
	rpt_expr_ty	*ep;
{
	if (!rpt_func_print__ncolumns)
		return 0;
	
	/*
	 * you may not print with more arguments
	 * than columns defined
	 */
	return (ep->nchild <= rpt_func_print__ncolumns);
}


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

static rpt_value_ty *
run(ep, argc, argv)
	rpt_expr_ty	*ep;
	size_t		argc;
	rpt_value_ty	**argv;
{
	size_t		j, k;
	rpt_value_ty	*vp;
	static size_t	argc2;
	static rpt_value_ty **argv2;
	string_ty	*s;

	if (argc > rpt_func_print__ncolumns)
	{
		sub_context_ty *scp;

		scp = sub_context_new();
		sub_var_set_charstar(scp, "Function", "print");
		sub_var_set_long(scp, "Number1", (long)argc);
		sub_var_set_long(scp, "Number2", (long)rpt_func_print__ncolumns);
		s =
			subst_intl
			(
				scp,
      i18n("$function: too many arguments ($number1 given, only $number2 used)")
			);
		sub_context_delete(scp);
		vp = rpt_value_error(ep->pos, s);
		str_free(s);
		return vp;
	}

	/*
	 * allocate more space for argv2 if necessary
	 */
	if (argc > argc2)
	{
		argc2 = argc;
		argv2 = mem_change_size(argv2, argc2 * sizeof(argv2[0]));
	}

	/*
	 * turn each argument into a string
	 */
	for (j = 0; j < argc; ++j)
	{
		sub_context_ty	*scp;

		vp = rpt_value_stringize(argv[j]);
		if (vp->method->type == rpt_value_type_string)
		{
			argv2[j] = vp;
			continue;
		}

		/*
		 * If it refuses to become a string,
		 * free up the converted values...
		 */
		rpt_value_free(vp);
		for (k = 0; k < j; ++k)
			rpt_value_free(argv2[k]);
		mem_free(argv2);

		/*
		 * ...and complain bitterly
		 */
		scp = sub_context_new();
		sub_var_set_charstar(scp, "Function", "print");
		sub_var_set_long(scp, "Number", (long)j + 1);
		sub_var_set_charstar(scp, "Name", argv[j]->method->name);
		s =
			subst_intl
			(
				scp,
		i18n("$function: argument $number: unable to print $name value")
			);
		sub_context_delete(scp);
		vp = rpt_value_error(ep->pos, s);
		str_free(s);
		return vp;
	}

	/*
	 * now that we know they are all stringizable, print the line out
	 */
	for (j = 0; j < argc; ++j)
	{
		vp = rpt_value_stringize(argv2[j]);
		assert(vp->method->type == rpt_value_type_string);
		if (rpt_func_print__column[j])
		{
			output_put_str
			(
				rpt_func_print__column[j],
				rpt_value_string_query(vp)
			);
		}
	}

	/*
	 * Emit the line.
	 *
	 * The os_become bracketing is because we would write to the
	 * file at this point, and some operatings systems will barf if
	 * we have the wrong uid.
	 */
	os_become_orig();
	col_eoln(rpt_func_print__colp);
	os_become_undo();

	/*
	 * free all the stringized values
	 * (but keep argv2, we will need it again)
	 */
	for (j = 0; j < argc; ++j)
		rpt_value_free(argv2[j]);
	return rpt_value_void();
}


rpt_func_ty rpt_func_print =
{
	"print",
	0, /* not optimizable */
	verify,
	run
};