Source/WebCore/css/CSSKeyframesRule.cpp

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 * Copyright (C) 2007, 2008, 2012, 2013, 2014 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *    notice, this list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"
#include "CSSKeyframesRule.h"

#include "CSSDeferredParser.h"
#include "CSSKeyframeRule.h"
#include "CSSParser.h"
#include "CSSRuleList.h"
#include "CSSStyleSheet.h"
#include "Document.h"
#include <wtf/text/StringBuilder.h>

namespace WebCore {

StyleRuleKeyframes::StyleRuleKeyframes(const AtomString& name)
    : StyleRuleBase(Keyframes)
    , m_name(name)
{
}

StyleRuleKeyframes::StyleRuleKeyframes(const AtomString& name, std::unique_ptr<DeferredStyleGroupRuleList>&& deferredRules)
    : StyleRuleBase(Keyframes)
    , m_name(name)
    , m_deferredRules(WTFMove(deferredRules))
{
    
}

StyleRuleKeyframes::StyleRuleKeyframes(const StyleRuleKeyframes& o)
    : StyleRuleBase(o)
    , m_name(o.m_name)
{
    m_keyframes.reserveInitialCapacity(o.keyframes().size());
    for (auto& keyframe : o.keyframes())
        m_keyframes.uncheckedAppend(keyframe.copyRef());
}

StyleRuleKeyframes::~StyleRuleKeyframes() = default;

void StyleRuleKeyframes::parseDeferredRulesIfNeeded() const
{
    if (!m_deferredRules)
        return;
    
    m_deferredRules->parseDeferredKeyframes(const_cast<StyleRuleKeyframes&>(*this));
    m_deferredRules = nullptr;
}

const Vector<Ref<StyleRuleKeyframe>>& StyleRuleKeyframes::keyframes() const
{
    parseDeferredRulesIfNeeded();
    return m_keyframes;
}

void StyleRuleKeyframes::parserAppendKeyframe(RefPtr<StyleRuleKeyframe>&& keyframe)
{
    if (!keyframe)
        return;
    m_keyframes.append(keyframe.releaseNonNull());
}

void StyleRuleKeyframes::wrapperAppendKeyframe(Ref<StyleRuleKeyframe>&& keyframe)
{
    parseDeferredRulesIfNeeded();
    m_keyframes.append(WTFMove(keyframe));
}

void StyleRuleKeyframes::wrapperRemoveKeyframe(unsigned index)
{
    parseDeferredRulesIfNeeded();
    m_keyframes.remove(index);
}

size_t StyleRuleKeyframes::findKeyframeIndex(const String& key) const
{
    parseDeferredRulesIfNeeded();

    auto keys = CSSParser::parseKeyframeKeyList(key);

    if (!keys)
        return notFound;

    for (size_t i = m_keyframes.size(); i--; ) {
        if (m_keyframes[i]->keys() == *keys)
            return i;
    }

    return notFound;
}

CSSKeyframesRule::CSSKeyframesRule(StyleRuleKeyframes& keyframesRule, CSSStyleSheet* parent)
    : CSSRule(parent)
    , m_keyframesRule(keyframesRule)
    , m_childRuleCSSOMWrappers(keyframesRule.keyframes().size())
{
}

CSSKeyframesRule::~CSSKeyframesRule()
{
    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());

    for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
        if (m_childRuleCSSOMWrappers[i])
            m_childRuleCSSOMWrappers[i]->setParentRule(0);
    }
}

void CSSKeyframesRule::setName(const String& name)
{
    CSSStyleSheet::RuleMutationScope mutationScope(this);

    m_keyframesRule->setName(name);
}

void CSSKeyframesRule::appendRule(const String& ruleText)
{
    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());

    CSSParser parser(parserContext());
    RefPtr<StyleRuleKeyframe> keyframe = parser.parseKeyframeRule(ruleText);
    if (!keyframe)
        return;

    CSSStyleSheet::RuleMutationScope mutationScope(this);

    m_keyframesRule->wrapperAppendKeyframe(keyframe.releaseNonNull());

    m_childRuleCSSOMWrappers.grow(length());
}

void CSSKeyframesRule::insertRule(const String& ruleText)
{
    if (CSSStyleSheet* parent = parentStyleSheet()) {
        if (Document* ownerDocument = parent->ownerDocument())
            ownerDocument->addConsoleMessage(MessageSource::JS, MessageLevel::Warning, "CSSKeyframesRule 'insertRule' function is deprecated.  Use 'appendRule' instead."_s);
    }
    appendRule(ruleText);
}

void CSSKeyframesRule::deleteRule(const String& s)
{
    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());

    size_t i = m_keyframesRule->findKeyframeIndex(s);
    if (i == notFound)
        return;

    CSSStyleSheet::RuleMutationScope mutationScope(this);

    m_keyframesRule->wrapperRemoveKeyframe(i);

    if (m_childRuleCSSOMWrappers[i])
        m_childRuleCSSOMWrappers[i]->setParentRule(0);
    m_childRuleCSSOMWrappers.remove(i);
}

CSSKeyframeRule* CSSKeyframesRule::findRule(const String& s)
{
    size_t i = m_keyframesRule->findKeyframeIndex(s);
    return i != notFound ? item(i) : nullptr;
}

String CSSKeyframesRule::cssText() const
{
    StringBuilder result;
    result.appendLiteral("@-webkit-keyframes ");
    result.append(name());
    result.appendLiteral(" { \n");

    unsigned size = length();
    for (unsigned i = 0; i < size; ++i) {
        result.appendLiteral("  ");
        result.append(m_keyframesRule->keyframes()[i]->cssText());
        result.append('\n');
    }
    result.append('}');
    return result.toString();
}

unsigned CSSKeyframesRule::length() const
{ 
    return m_keyframesRule->keyframes().size(); 
}

CSSKeyframeRule* CSSKeyframesRule::item(unsigned index) const
{ 
    if (index >= length())
        return nullptr;
    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());
    auto& rule = m_childRuleCSSOMWrappers[index];
    if (!rule)
        rule = adoptRef(*new CSSKeyframeRule(m_keyframesRule->keyframes()[index], const_cast<CSSKeyframesRule*>(this)));
    return rule.get(); 
}

CSSRuleList& CSSKeyframesRule::cssRules()
{
    if (!m_ruleListCSSOMWrapper)
        m_ruleListCSSOMWrapper = makeUnique<LiveCSSRuleList<CSSKeyframesRule>>(*this);
    return *m_ruleListCSSOMWrapper;
}

void CSSKeyframesRule::reattach(StyleRuleBase& rule)
{
    ASSERT_WITH_SECURITY_IMPLICATION(rule.isKeyframesRule());
    m_keyframesRule = static_cast<StyleRuleKeyframes&>(rule);
}

} // namespace WebCore