1/*
2 * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
3 * Copyright (C) 2012 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above
10 *    copyright notice, this list of conditions and the following
11 *    disclaimer.
12 * 2. Redistributions in binary form must reproduce the above
13 *    copyright notice, this list of conditions and the following
14 *    disclaimer in the documentation and/or other materials
15 *    provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
26 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
27 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "core/css/CSSGroupingRule.h"
33
34#include "bindings/core/v8/ExceptionState.h"
35#include "core/css/CSSRuleList.h"
36#include "core/css/CSSStyleSheet.h"
37#include "core/css/parser/CSSParser.h"
38#include "core/dom/ExceptionCode.h"
39#include "core/frame/UseCounter.h"
40#include "wtf/text/StringBuilder.h"
41
42namespace blink {
43
44CSSGroupingRule::CSSGroupingRule(StyleRuleGroup* groupRule, CSSStyleSheet* parent)
45    : CSSRule(parent)
46    , m_groupRule(groupRule)
47    , m_childRuleCSSOMWrappers(groupRule->childRules().size())
48{
49}
50
51CSSGroupingRule::~CSSGroupingRule()
52{
53#if !ENABLE(OILPAN)
54    ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
55    for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
56        if (m_childRuleCSSOMWrappers[i])
57            m_childRuleCSSOMWrappers[i]->setParentRule(0);
58    }
59#endif
60}
61
62unsigned CSSGroupingRule::insertRule(const String& ruleString, unsigned index, ExceptionState& exceptionState)
63{
64    ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
65
66    if (index > m_groupRule->childRules().size()) {
67        exceptionState.throwDOMException(IndexSizeError, "the index " + String::number(index) + " must be less than or equal to the length of the rule list.");
68        return 0;
69    }
70
71    CSSStyleSheet* styleSheet = parentStyleSheet();
72    CSSParserContext context(parserContext(), UseCounter::getFrom(styleSheet));
73    RefPtrWillBeRawPtr<StyleRuleBase> newRule = CSSParser::parseRule(context, styleSheet ? styleSheet->contents() : 0, ruleString);
74    if (!newRule) {
75        exceptionState.throwDOMException(SyntaxError, "the rule '" + ruleString + "' is invalid and cannot be parsed.");
76        return 0;
77    }
78
79    if (newRule->isImportRule()) {
80        // FIXME: an HierarchyRequestError should also be thrown for a @charset or a nested
81        // @media rule. They are currently not getting parsed, resulting in a SyntaxError
82        // to get raised above.
83        exceptionState.throwDOMException(HierarchyRequestError, "'@import' rules cannot be inserted inside a group rule.");
84        return 0;
85    }
86    CSSStyleSheet::RuleMutationScope mutationScope(this);
87
88    m_groupRule->wrapperInsertRule(index, newRule);
89
90    m_childRuleCSSOMWrappers.insert(index, RefPtrWillBeMember<CSSRule>(nullptr));
91    return index;
92}
93
94void CSSGroupingRule::deleteRule(unsigned index, ExceptionState& exceptionState)
95{
96    ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
97
98    if (index >= m_groupRule->childRules().size()) {
99        exceptionState.throwDOMException(IndexSizeError, "the index " + String::number(index) + " is greated than the length of the rule list.");
100        return;
101    }
102
103    CSSStyleSheet::RuleMutationScope mutationScope(this);
104
105    m_groupRule->wrapperRemoveRule(index);
106
107    if (m_childRuleCSSOMWrappers[index])
108        m_childRuleCSSOMWrappers[index]->setParentRule(0);
109    m_childRuleCSSOMWrappers.remove(index);
110}
111
112void CSSGroupingRule::appendCSSTextForItems(StringBuilder& result) const
113{
114    unsigned size = length();
115    for (unsigned i = 0; i < size; ++i) {
116        result.appendLiteral("  ");
117        result.append(item(i)->cssText());
118        result.append('\n');
119    }
120}
121
122unsigned CSSGroupingRule::length() const
123{
124    return m_groupRule->childRules().size();
125}
126
127CSSRule* CSSGroupingRule::item(unsigned index) const
128{
129    if (index >= length())
130        return 0;
131    ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
132    RefPtrWillBeMember<CSSRule>& rule = m_childRuleCSSOMWrappers[index];
133    if (!rule)
134        rule = m_groupRule->childRules()[index]->createCSSOMWrapper(const_cast<CSSGroupingRule*>(this));
135    return rule.get();
136}
137
138CSSRuleList* CSSGroupingRule::cssRules() const
139{
140    if (!m_ruleListCSSOMWrapper)
141        m_ruleListCSSOMWrapper = LiveCSSRuleList<CSSGroupingRule>::create(const_cast<CSSGroupingRule*>(this));
142    return m_ruleListCSSOMWrapper.get();
143}
144
145void CSSGroupingRule::reattach(StyleRuleBase* rule)
146{
147    ASSERT(rule);
148    m_groupRule = static_cast<StyleRuleGroup*>(rule);
149    for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
150        if (m_childRuleCSSOMWrappers[i])
151            m_childRuleCSSOMWrappers[i]->reattach(m_groupRule->childRules()[i].get());
152    }
153}
154
155void CSSGroupingRule::trace(Visitor* visitor)
156{
157    CSSRule::trace(visitor);
158#if ENABLE(OILPAN)
159    visitor->trace(m_childRuleCSSOMWrappers);
160#endif
161    visitor->trace(m_groupRule);
162    visitor->trace(m_ruleListCSSOMWrapper);
163}
164
165} // namespace blink
166