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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef CSSValueList_h
     22 #define CSSValueList_h
     23 
     24 #include "core/css/CSSValue.h"
     25 #include "wtf/PassRefPtr.h"
     26 #include "wtf/Vector.h"
     27 
     28 namespace WebCore {
     29 
     30 class CSSParserValueList;
     31 
     32 class CSSValueList : public CSSValue {
     33 public:
     34     static PassRefPtrWillBeRawPtr<CSSValueList> createCommaSeparated()
     35     {
     36         return adoptRefWillBeNoop(new CSSValueList(CommaSeparator));
     37     }
     38     static PassRefPtrWillBeRawPtr<CSSValueList> createSpaceSeparated()
     39     {
     40         return adoptRefWillBeNoop(new CSSValueList(SpaceSeparator));
     41     }
     42     static PassRefPtrWillBeRawPtr<CSSValueList> createSlashSeparated()
     43     {
     44         return adoptRefWillBeNoop(new CSSValueList(SlashSeparator));
     45     }
     46     static PassRefPtrWillBeRawPtr<CSSValueList> createFromParserValueList(CSSParserValueList* list)
     47     {
     48         return adoptRefWillBeNoop(new CSSValueList(list));
     49     }
     50 
     51     size_t length() const { return m_values.size(); }
     52     CSSValue* item(size_t index) { return index < m_values.size() ? m_values[index].get() : 0; }
     53     const CSSValue* item(size_t index) const { return index < m_values.size() ? m_values[index].get() : 0; }
     54     CSSValue* itemWithoutBoundsCheck(size_t index) { return m_values[index].get(); }
     55 
     56     void append(PassRefPtrWillBeRawPtr<CSSValue> value) { m_values.append(value); }
     57     void prepend(PassRefPtrWillBeRawPtr<CSSValue> value) { m_values.prepend(value); }
     58     bool removeAll(CSSValue*);
     59     bool hasValue(CSSValue*) const;
     60     PassRefPtrWillBeRawPtr<CSSValueList> copy();
     61 
     62     String customCSSText(CSSTextFormattingFlags = QuoteCSSStringIfNeeded) const;
     63     bool equals(const CSSValueList&) const;
     64     bool equals(const CSSValue&) const;
     65 
     66     bool hasFailedOrCanceledSubresources() const;
     67 
     68     PassRefPtrWillBeRawPtr<CSSValueList> cloneForCSSOM() const;
     69 
     70     void traceAfterDispatch(Visitor*);
     71 
     72 protected:
     73     CSSValueList(ClassType, ValueListSeparator);
     74     CSSValueList(const CSSValueList& cloneFrom);
     75 
     76 private:
     77     explicit CSSValueList(ValueListSeparator);
     78     explicit CSSValueList(CSSParserValueList*);
     79 
     80     WillBeHeapVector<RefPtrWillBeMember<CSSValue>, 4> m_values;
     81 };
     82 
     83 DEFINE_CSS_VALUE_TYPE_CASTS(CSSValueList, isValueList());
     84 
     85 // Objects of this class are intended to be stack-allocated and scoped to a single function.
     86 // Please take care not to pass these around as they do hold onto a raw pointer.
     87 class CSSValueListInspector {
     88     STACK_ALLOCATED();
     89 public:
     90     CSSValueListInspector(CSSValue* value) : m_list((value && value->isValueList()) ? toCSSValueList(value) : 0) { }
     91     CSSValue* item(size_t index) const { ASSERT_WITH_SECURITY_IMPLICATION(index < length()); return m_list->itemWithoutBoundsCheck(index); }
     92     CSSValue* first() const { return item(0); }
     93     CSSValue* second() const { return item(1); }
     94     size_t length() const { return m_list ? m_list->length() : 0; }
     95 private:
     96     RawPtrWillBeMember<CSSValueList> m_list;
     97 };
     98 
     99 // Wrapper that can be used to iterate over any CSSValue. Non-list values and 0 behave as zero-length lists.
    100 // Objects of this class are intended to be stack-allocated and scoped to a single function.
    101 // Please take care not to pass these around as they do hold onto a raw pointer.
    102 class CSSValueListIterator {
    103     STACK_ALLOCATED();
    104 public:
    105     CSSValueListIterator(CSSValue* value) : m_inspector(value), m_position(0) { }
    106     bool hasMore() const { return m_position < m_inspector.length(); }
    107     CSSValue* value() const { return m_inspector.item(m_position); }
    108     bool isPrimitiveValue() const { return value()->isPrimitiveValue(); }
    109     void advance() { m_position++; ASSERT(m_position <= m_inspector.length());}
    110     size_t index() const { return m_position; }
    111 private:
    112     CSSValueListInspector m_inspector;
    113     size_t m_position;
    114 };
    115 
    116 } // namespace WebCore
    117 
    118 #endif // CSSValueList_h
    119