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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 blink {
     29 
     30 class CSSValueList : public CSSValue {
     31 public:
     32     static PassRefPtrWillBeRawPtr<CSSValueList> createCommaSeparated()
     33     {
     34         return adoptRefWillBeNoop(new CSSValueList(CommaSeparator));
     35     }
     36     static PassRefPtrWillBeRawPtr<CSSValueList> createSpaceSeparated()
     37     {
     38         return adoptRefWillBeNoop(new CSSValueList(SpaceSeparator));
     39     }
     40     static PassRefPtrWillBeRawPtr<CSSValueList> createSlashSeparated()
     41     {
     42         return adoptRefWillBeNoop(new CSSValueList(SlashSeparator));
     43     }
     44 
     45     size_t length() const { return m_values.size(); }
     46     CSSValue* item(size_t index) { return m_values[index].get(); }
     47     const CSSValue* item(size_t index) const { return m_values[index].get(); }
     48     CSSValue* itemWithBoundsCheck(size_t index) { return index < m_values.size() ? m_values[index].get() : 0; }
     49 
     50     void append(PassRefPtrWillBeRawPtr<CSSValue> value) { m_values.append(value); }
     51     void prepend(PassRefPtrWillBeRawPtr<CSSValue> value) { m_values.prepend(value); }
     52     bool removeAll(CSSValue*);
     53     bool hasValue(CSSValue*) const;
     54     PassRefPtrWillBeRawPtr<CSSValueList> copy();
     55 
     56     String customCSSText(CSSTextFormattingFlags = QuoteCSSStringIfNeeded) const;
     57     bool equals(const CSSValueList&) const;
     58     bool equals(const CSSValue&) const;
     59 
     60     bool hasFailedOrCanceledSubresources() const;
     61 
     62     PassRefPtrWillBeRawPtr<CSSValueList> cloneForCSSOM() const;
     63 
     64     void traceAfterDispatch(Visitor*);
     65 
     66 protected:
     67     CSSValueList(ClassType, ValueListSeparator);
     68     CSSValueList(const CSSValueList& cloneFrom);
     69 
     70 private:
     71     explicit CSSValueList(ValueListSeparator);
     72 
     73     WillBeHeapVector<RefPtrWillBeMember<CSSValue>, 4> m_values;
     74 };
     75 
     76 DEFINE_CSS_VALUE_TYPE_CASTS(CSSValueList, isValueList());
     77 
     78 // Objects of this class are intended to be stack-allocated and scoped to a single function.
     79 // Please take care not to pass these around as they do hold onto a raw pointer.
     80 class CSSValueListInspector {
     81     STACK_ALLOCATED();
     82 public:
     83     CSSValueListInspector(CSSValue* value) : m_list((value && value->isValueList()) ? toCSSValueList(value) : 0) { }
     84     CSSValue* item(size_t index) const { ASSERT_WITH_SECURITY_IMPLICATION(index < length()); return m_list->item(index); }
     85     CSSValue* first() const { return item(0); }
     86     CSSValue* second() const { return item(1); }
     87     size_t length() const { return m_list ? m_list->length() : 0; }
     88 private:
     89     RawPtrWillBeMember<CSSValueList> m_list;
     90 };
     91 
     92 // Wrapper that can be used to iterate over any CSSValue. Non-list values and 0 behave as zero-length lists.
     93 // Objects of this class are intended to be stack-allocated and scoped to a single function.
     94 // Please take care not to pass these around as they do hold onto a raw pointer.
     95 class CSSValueListIterator {
     96     STACK_ALLOCATED();
     97 public:
     98     CSSValueListIterator(CSSValue* value) : m_inspector(value), m_position(0) { }
     99     bool hasMore() const { return m_position < m_inspector.length(); }
    100     CSSValue* value() const { return m_inspector.item(m_position); }
    101     bool isPrimitiveValue() const { return value()->isPrimitiveValue(); }
    102     void advance() { m_position++; ASSERT(m_position <= m_inspector.length());}
    103     size_t index() const { return m_position; }
    104 private:
    105     CSSValueListInspector m_inspector;
    106     size_t m_position;
    107 };
    108 
    109 } // namespace blink
    110 
    111 #endif // CSSValueList_h
    112