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/* -*- Mode: C; indent-tabs-mode:nil; c-basic-offset: 8-*- */
/*
* This file is part of The Croco Library
*
* Copyright (C) 2002-2003 Dodji Seketeli <dodji@seketeli.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2.1 of the
* GNU Lesser General Public
* License as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*
*$Id$
*/
#include <string.h>
#include "cr-cascade.h"
#define PRIVATE(a_this) ((a_this)->priv)
struct _CRCascadePriv {
/**
*the 3 style sheets of the cascade:
*author, user, and useragent sheet.
*Intended to be addressed by
*sheets[ORIGIN_AUTHOR] or sheets[ORIGIN_USER]
*of sheets[ORIGIN_UA] ;
*/
CRStyleSheet *sheets[3];
guint ref_count;
};
/**
* cr_cascade_new:
*@a_author_sheet: the author origin style sheet. May be NULL.
*@a_user_sheet: the user origin style sheet. May be NULL.
*@a_ua_sheet: the user agent origin style sheet. May be NULL.
*
*Constructor of the #CRCascade class.
*Note that all three parameters of this
*method are ref counted and their refcount is increased.
*Their refcount will be decreased at the destruction of
*the instance of #CRCascade.
*So the caller should not call their destructor. The caller
*should call their ref/unref method instead if it wants
*
*Returns the newly built instance of CRCascade or NULL if
*an error arose during construction.
*/
CRCascade *
cr_cascade_new (CRStyleSheet * a_author_sheet,
CRStyleSheet * a_user_sheet, CRStyleSheet * a_ua_sheet)
{
CRCascade *result = NULL;
result = g_try_malloc (sizeof (CRCascade));
if (!result) {
cr_utils_trace_info ("Out of memory");
return NULL;
}
memset (result, 0, sizeof (CRCascade));
PRIVATE (result) = g_try_malloc (sizeof (CRCascadePriv));
if (!PRIVATE (result)) {
cr_utils_trace_info ("Out of memory");
g_free (result);
return NULL;
}
memset (PRIVATE (result), 0, sizeof (CRCascadePriv));
if (a_author_sheet) {
cr_cascade_set_sheet (result, a_author_sheet, ORIGIN_AUTHOR);
}
if (a_user_sheet) {
cr_cascade_set_sheet (result, a_user_sheet, ORIGIN_USER);
}
if (a_ua_sheet) {
cr_cascade_set_sheet (result, a_ua_sheet, ORIGIN_UA);
}
return result;
}
/**
* cr_cascade_get_sheet:
*@a_this: the current instance of #CRCascade.
*@a_origin: the origin of the style sheet as
*defined in the css2 spec in chapter 6.4.
*Gets a given origin sheet.
*
*Gets a sheet, part of the cascade.
*Note that the returned stylesheet
*is refcounted so if the caller wants
*to manage it's lifecycle, it must use
*cr_stylesheet_ref()/cr_stylesheet_unref() instead
*of the cr_stylesheet_destroy() method.
*Returns the style sheet, or NULL if it does not
*exist.
*/
CRStyleSheet *
cr_cascade_get_sheet (CRCascade * a_this, enum CRStyleOrigin a_origin)
{
g_return_val_if_fail (a_this
&& a_origin >= ORIGIN_UA
&& a_origin < NB_ORIGINS, NULL);
return PRIVATE (a_this)->sheets[a_origin];
}
/**
* cr_cascade_set_sheet:
*@a_this: the current instance of #CRCascade.
*@a_sheet: the stylesheet to set.
*@a_origin: the origin of the stylesheet.
*
*Sets a stylesheet in the cascade
*
*Returns CR_OK upon successful completion, an error
*code otherwise.
*/
enum CRStatus
cr_cascade_set_sheet (CRCascade * a_this,
CRStyleSheet * a_sheet, enum CRStyleOrigin a_origin)
{
g_return_val_if_fail (a_this
&& a_sheet
&& a_origin >= ORIGIN_UA
&& a_origin < NB_ORIGINS, CR_BAD_PARAM_ERROR);
if (PRIVATE (a_this)->sheets[a_origin])
cr_stylesheet_unref (PRIVATE (a_this)->sheets[a_origin]);
PRIVATE (a_this)->sheets[a_origin] = a_sheet;
cr_stylesheet_ref (a_sheet);
a_sheet->origin = a_origin;
return CR_OK;
}
/**
*cr_cascade_ref:
*@a_this: the current instance of #CRCascade
*
*Increases the reference counter of the current instance
*of #CRCascade.
*/
void
cr_cascade_ref (CRCascade * a_this)
{
g_return_if_fail (a_this && PRIVATE (a_this));
PRIVATE (a_this)->ref_count++;
}
/**
* cr_cascade_unref:
*@a_this: the current instance of
*#CRCascade.
*
*Decrements the reference counter associated
*to this instance of #CRCascade. If the reference
*counter reaches zero, the instance is destroyed
*using cr_cascade_destroy()
*/
void
cr_cascade_unref (CRCascade * a_this)
{
g_return_if_fail (a_this && PRIVATE (a_this));
if (PRIVATE (a_this)->ref_count)
PRIVATE (a_this)->ref_count--;
if (!PRIVATE (a_this)->ref_count) {
cr_cascade_destroy (a_this);
}
}
/**
* cr_cascade_destroy:
* @a_this: the current instance of #CRCascade
*
* Destructor of #CRCascade.
*/
void
cr_cascade_destroy (CRCascade * a_this)
{
g_return_if_fail (a_this);
if (PRIVATE (a_this)) {
gulong i = 0;
for (i = 0; i < NB_ORIGINS; i++) {
if (PRIVATE (a_this)->sheets[i]) {
if (cr_stylesheet_unref
(PRIVATE (a_this)->sheets[i])
== TRUE) {
PRIVATE (a_this)->sheets[i] = NULL;
}
}
}
g_free (PRIVATE (a_this));
PRIVATE (a_this) = NULL;
}
g_free (a_this);
}
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