/*
	#FILENAME#

	#DESCRIPTION#

	Copyright (C) 2001 #AUTHOR#

	Author: #AUTHOR#
	Date: #DATE#

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
static const char rcsid[] =
	"$Id$";

#include <QF/hash.h>
#include <QF/sys.h>

#include "qfcc.h"
#include "struct.h"

typedef struct {
	const char *name;
	type_t     *type;
} struct_t;

typedef struct {
	const char *name;
	expr_t      value;
} enum_t;

static hashtab_t *structs;
static hashtab_t *enums;

static const char *
structs_get_key (void *s, void *unused)
{
	return ((struct_t *) s)->name;
}

static const char *
struct_field_get_key (void *f, void *unused)
{
	return ((struct_field_t *) f)->name;
}

static const char *
enums_get_key (void *e, void *unused)
{
	return ((enum_t *) e)->name;
}

struct_field_t *
new_struct_field (type_t *strct, type_t *type, const char *name)
{
	struct_field_t *field;

	if (!strct)
		return 0;
	field = malloc (sizeof (struct_field_t));
	field->name = name;
	field->type = type;
	field->offset = strct->num_parms;
	strct->num_parms += pr_type_size[type->type];
	field->next = 0;
	*strct->struct_tail = field;
	strct->struct_tail = &field->next;
	Hash_Add (strct->struct_fields, field);
	return field;
}

struct_field_t *
struct_find_field (type_t *strct, const char *name)
{
	if (!structs)
		return 0;
	return Hash_Find (strct->struct_fields, name);
}

type_t *
new_struct (const char *name)
{
	struct_t   *strct;

	if (!structs) {
		structs = Hash_NewTable (16381, structs_get_key, 0, 0);
	}
	strct = (struct_t *) Hash_Find (structs, name);
	if (strct) {
		error (0, "duplicate struct definition");
		return 0;
	}
	strct = malloc (sizeof (struct_t));
	strct->name = name;
	strct->type = calloc (1, sizeof (type_t));
	strct->type->type = ev_struct;
	strct->type->struct_tail = &strct->type->struct_head;
	strct->type->struct_fields = Hash_NewTable (61, struct_field_get_key, 0, 0);
	Hash_Add (structs, strct);
	return strct->type;
}

type_t *
find_struct (const char *name)
{
	struct_t   *strct;

	if (!structs)
		return 0;
	strct = (struct_t *) Hash_Find (structs, name);
	if (strct)
		return strct->type;
	return 0;
}

void
process_enum (expr_t *enm)
{
	expr_t     *e = enm;
	expr_t     *c_enum = 0;
	int         enum_val = 0;

	if (!enums) {
		enums = Hash_NewTable (16381, enums_get_key, 0, 0);
	}
	while (e) {
		expr_t     *t = e->next;
		e->next = c_enum;
		c_enum = e;
		e = t;
	}
	for (e = c_enum; e; e = e->next) {
		expr_t     *name = e;
		expr_t     *val = 0;
		enum_t     *new_enum;

		if (name->type == ex_expr) {
			val = name->e.expr.e2;
			name = name->e.expr.e1;
		}
		if ((structs && find_struct (name->e.string_val))
			|| get_enum (name->e.string_val)
			|| PR_GetDef (NULL, name->e.string_val, 0, 0)) {
			error (name, "%s redeclared", name->e.string_val);
			continue;
		}
		if (val)
			enum_val = val->e.integer_val;
		new_enum = malloc (sizeof (enum_t));
		if (!new_enum)
			Sys_Error ("out of memory");
		new_enum->name = name->e.string_val;
		new_enum->value.type = ex_integer;
		new_enum->value.e.integer_val = enum_val++;
		Hash_Add (enums, new_enum);
		//printf ("%s = %d\n", new_enum->name, new_enum->value.e.integer_val);
	}
}

expr_t *
get_enum (const char *name)
{
	enum_t     *e;

	if (!enums)
		return 0;
	e = (enum_t *) Hash_Find (enums, name);
	if (!e)
		return 0;
	return &e->value;
}