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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 
42 namespace blink {
43 
CSSGroupingRule(StyleRuleGroup * groupRule,CSSStyleSheet * parent)44 CSSGroupingRule::CSSGroupingRule(StyleRuleGroup* groupRule, CSSStyleSheet* parent)
45     : CSSRule(parent)
46     , m_groupRule(groupRule)
47     , m_childRuleCSSOMWrappers(groupRule->childRules().size())
48 {
49 }
50 
~CSSGroupingRule()51 CSSGroupingRule::~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 
insertRule(const String & ruleString,unsigned index,ExceptionState & exceptionState)62 unsigned 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 
deleteRule(unsigned index,ExceptionState & exceptionState)94 void 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 
appendCSSTextForItems(StringBuilder & result) const112 void 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 
length() const122 unsigned CSSGroupingRule::length() const
123 {
124     return m_groupRule->childRules().size();
125 }
126 
item(unsigned index) const127 CSSRule* 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 
cssRules() const138 CSSRuleList* 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 
reattach(StyleRuleBase * rule)145 void 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 
trace(Visitor * visitor)155 void 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