/*

 * (C) 1999-2003 Lars Knoll (knoll@kde.org)

 * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#include "config.h"

#include "CSSStyleSheet.h"

#include "CSSImportRule.h"

#include "CSSNamespace.h"

#include "CSSRuleList.h"

#include "Document.h"

#include "ExceptionCode.h"

#include "Node.h"

#if PLATFORM(SYMBIAN)

#include "oom.h"

#endif

namespace WebCore {

CSSStyleSheet::CSSStyleSheet(CSSStyleSheet* parentSheet, const String& href, const String& charset)

    : StyleSheet(parentSheet, href)

    , m_doc(parentSheet ? parentSheet->doc() : 0)

    , m_namespaces(0)

    , m_charset(charset)

    , m_loadCompleted(false)

{

}

CSSStyleSheet::CSSStyleSheet(Node *parentNode, const String& href, const String& charset)

    : StyleSheet(parentNode, href)

    , m_doc(parentNode->document())

    , m_namespaces(0)

    , m_charset(charset)

    , m_loadCompleted(false)

{

}

CSSStyleSheet::CSSStyleSheet(CSSRule *ownerRule, const String& href, const String& charset)

    : StyleSheet(ownerRule, href)

    , m_doc(0)

    , m_namespaces(0)

    , m_charset(charset)

    , m_loadCompleted(false)

{

}

CSSStyleSheet::~CSSStyleSheet()

{

    delete m_namespaces;

}

CSSRule *CSSStyleSheet::ownerRule() const

{

    return (parent() && parent()->isRule()) ? static_cast<CSSRule*>(parent()) : 0;

}

unsigned CSSStyleSheet::insertRule(const String& rule, unsigned index, ExceptionCode& ec)

{

    ec = 0;

    if (index > length()) {

        ec = INDEX_SIZE_ERR;

        return 0;

    }

    CSSParser p(useStrictParsing());

    RefPtr<CSSRule> r = p.parseRule(this, rule);

    if (!r) {

        ec = SYNTAX_ERR;

        return 0;

    }

    // ###

    // HIERARCHY_REQUEST_ERR: Raised if the rule cannot be inserted at the specified index e.g. if an

    //@import rule is inserted after a standard rule set or other at-rule.

    insert(index, r.release());

    styleSheetChanged();

    return index;

}

int CSSStyleSheet::addRule(const String& selector, const String& style, int index, ExceptionCode& ec)

{

    insertRule(selector + " { " + style + " }", index, ec);

    // As per Microsoft documentation, always return -1.

    return -1;

}

int CSSStyleSheet::addRule(const String& selector, const String& style, ExceptionCode& ec)

{

    return addRule(selector, style, length(), ec);

}

CSSRuleList* CSSStyleSheet::cssRules(bool omitCharsetRules)

{

    return new CSSRuleList(this, omitCharsetRules);

}

void CSSStyleSheet::deleteRule(unsigned index, ExceptionCode& ec)

{

    if (index >= length()) {

        ec = INDEX_SIZE_ERR;

        return;

    }

    ec = 0;

    remove(index);

    styleSheetChanged();

}

void CSSStyleSheet::addNamespace(CSSParser* p, const AtomicString& prefix, const AtomicString& uri)

{

    if (uri.isEmpty())

        return;

    m_namespaces = new CSSNamespace(prefix, uri, m_namespaces);

    if (prefix.isEmpty())

        // Set the default namespace on the parser so that selectors that omit namespace info will

        // be able to pick it up easily.

        p->defaultNamespace = uri;

}

const AtomicString& CSSStyleSheet::determineNamespace(const AtomicString& prefix)

{

    if (prefix.isEmpty())

        return nullAtom; // No namespace. If an element/attribute has a namespace, we won't match it.

    else if (prefix == starAtom)

        return starAtom; // We'll match any namespace.

    else if (m_namespaces) {

        CSSNamespace* ns = m_namespaces->namespaceForPrefix(prefix);

        if (ns)

            return ns->uri();

    }

    return nullAtom; // Assume we wont match any namespaces.

}

bool CSSStyleSheet::parseString(const String &string, bool strict)

{

#if PLATFORM(SYMBIAN)	

    OOM_PRE_CHECK(string.length() * 7, 0, "CSSStyleSheet::parseString" )

#endif

    setStrictParsing(strict);

    CSSParser p(strict);

    p.parseSheet(this, string);

#if PLATFORM(SYMBIAN)	

    OOM_POST_CHECK_FAILED(return false;)

#endif

    return true;

}

bool CSSStyleSheet::isLoading()

{

    unsigned len = length();

    for (unsigned i = 0; i < len; ++i) {

        StyleBase* rule = item(i);

        if (rule->isImportRule() && static_cast<CSSImportRule*>(rule)->isLoading())

            return true;

    }

    return false;

}

void CSSStyleSheet::checkLoaded()

{

    if (isLoading())

        return;

    if (parent())

        parent()->checkLoaded();

    m_loadCompleted = m_parentNode ? m_parentNode->sheetLoaded() : true;

}

DocLoader *CSSStyleSheet::docLoader()

{

    if (!m_doc) // doc is 0 for the user- and default-sheet!

        return 0;

    // ### remove? (clients just use sheet->doc()->docLoader())

    return m_doc->docLoader();

}

void CSSStyleSheet::styleSheetChanged()

{

    StyleBase* root = this;

    while (StyleBase* parent = root->parent())

        root = parent;

    Document* documentToUpdate = (root && root->isCSSStyleSheet()) ? static_cast<CSSStyleSheet*>(root)->doc() : 0;

    /* FIXME: We don't need to do everything updateStyleSelector does,

     * basically we just need to recreate the document's selector with the

     * already existing style sheets.

     */

    if (documentToUpdate)

        documentToUpdate->updateStyleSelector();

}

}