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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/v8/ExceptionState.h"
35 #include "core/css/CSSParser.h"
36 #include "core/css/CSSRuleList.h"
37 #include "core/css/CSSStyleSheet.h"
38 #include "core/dom/ExceptionCode.h"
39 #include "wtf/text/StringBuilder.h"
40 
41 namespace WebCore {
42 
CSSGroupingRule(StyleRuleGroup * groupRule,CSSStyleSheet * parent)43 CSSGroupingRule::CSSGroupingRule(StyleRuleGroup* groupRule, CSSStyleSheet* parent)
44     : CSSRule(parent)
45     , m_groupRule(groupRule)
46     , m_childRuleCSSOMWrappers(groupRule->childRules().size())
47 {
48 }
49 
~CSSGroupingRule()50 CSSGroupingRule::~CSSGroupingRule()
51 {
52     ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
53     for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
54         if (m_childRuleCSSOMWrappers[i])
55             m_childRuleCSSOMWrappers[i]->setParentRule(0);
56     }
57 }
58 
insertRule(const String & ruleString,unsigned index,ExceptionState & exceptionState)59 unsigned CSSGroupingRule::insertRule(const String& ruleString, unsigned index, ExceptionState& exceptionState)
60 {
61     ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
62 
63     if (index > m_groupRule->childRules().size()) {
64         exceptionState.throwDOMException(IndexSizeError, "the index " + String::number(index) + " must be less than or equal to the length of the rule list.");
65         return 0;
66     }
67 
68     CSSStyleSheet* styleSheet = parentStyleSheet();
69     CSSParser parser(parserContext(), UseCounter::getFrom(styleSheet));
70     RefPtr<StyleRuleBase> newRule = parser.parseRule(styleSheet ? styleSheet->contents() : 0, ruleString);
71     if (!newRule) {
72         exceptionState.throwDOMException(SyntaxError, "the rule '" + ruleString + "' is invalid and cannot be parsed.");
73         return 0;
74     }
75 
76     if (newRule->isImportRule()) {
77         // FIXME: an HierarchyRequestError should also be thrown for a @charset or a nested
78         // @media rule. They are currently not getting parsed, resulting in a SyntaxError
79         // to get raised above.
80         exceptionState.throwDOMException(HierarchyRequestError, "'@import' rules cannot be inserted inside a group rule.");
81         return 0;
82     }
83     CSSStyleSheet::RuleMutationScope mutationScope(this);
84 
85     m_groupRule->wrapperInsertRule(index, newRule);
86 
87     m_childRuleCSSOMWrappers.insert(index, RefPtr<CSSRule>());
88     return index;
89 }
90 
deleteRule(unsigned index,ExceptionState & exceptionState)91 void CSSGroupingRule::deleteRule(unsigned index, ExceptionState& exceptionState)
92 {
93     ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
94 
95     if (index >= m_groupRule->childRules().size()) {
96         exceptionState.throwDOMException(IndexSizeError, "the index " + String::number(index) + " is greated than the length of the rule list.");
97         return;
98     }
99 
100     CSSStyleSheet::RuleMutationScope mutationScope(this);
101 
102     m_groupRule->wrapperRemoveRule(index);
103 
104     if (m_childRuleCSSOMWrappers[index])
105         m_childRuleCSSOMWrappers[index]->setParentRule(0);
106     m_childRuleCSSOMWrappers.remove(index);
107 }
108 
appendCSSTextForItems(StringBuilder & result) const109 void CSSGroupingRule::appendCSSTextForItems(StringBuilder& result) const
110 {
111     unsigned size = length();
112     for (unsigned i = 0; i < size; ++i) {
113         result.appendLiteral("  ");
114         result.append(item(i)->cssText());
115         result.append('\n');
116     }
117 }
118 
length() const119 unsigned CSSGroupingRule::length() const
120 {
121     return m_groupRule->childRules().size();
122 }
123 
item(unsigned index) const124 CSSRule* CSSGroupingRule::item(unsigned index) const
125 {
126     if (index >= length())
127         return 0;
128     ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
129     RefPtr<CSSRule>& rule = m_childRuleCSSOMWrappers[index];
130     if (!rule)
131         rule = m_groupRule->childRules()[index]->createCSSOMWrapper(const_cast<CSSGroupingRule*>(this));
132     return rule.get();
133 }
134 
cssRules() const135 CSSRuleList* CSSGroupingRule::cssRules() const
136 {
137     if (!m_ruleListCSSOMWrapper)
138         m_ruleListCSSOMWrapper = adoptPtr(new LiveCSSRuleList<CSSGroupingRule>(const_cast<CSSGroupingRule*>(this)));
139     return m_ruleListCSSOMWrapper.get();
140 }
141 
reattach(StyleRuleBase * rule)142 void CSSGroupingRule::reattach(StyleRuleBase* rule)
143 {
144     ASSERT(rule);
145     m_groupRule = static_cast<StyleRuleGroup*>(rule);
146     for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
147         if (m_childRuleCSSOMWrappers[i])
148             m_childRuleCSSOMWrappers[i]->reattach(m_groupRule->childRules()[i].get());
149     }
150 }
151 
152 } // namespace WebCore
153