runtime/JSSetIterator.h

   1 /*
   2  * Copyright (C) 2013 Apple, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef JSSetIterator_h
  27 #define JSSetIterator_h
  28
  29 #include "JSDestructibleObject.h"
  30 #include "JSSet.h"
  31
  32 #include "MapData.h"
  33
  34 namespace JSC {
  35 enum SetIterationKind : uint32_t {
  36     SetIterateKey,
  37     SetIterateValue,
  38     SetIterateKeyValue,
  39 };
  40
  41 class JSSetIterator : public JSDestructibleObject {
  42 public:
  43     typedef JSDestructibleObject Base;
  44
  45     DECLARE_EXPORT_INFO;
  46
  47     static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
  48     {
  49         return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
  50     }
  51
  52     static JSSetIterator* create(VM& vm, Structure* structure, JSSet* iteratedObject, SetIterationKind kind)
  53     {
  54         JSSetIterator* instance = new (NotNull, allocateCell<JSSetIterator>(vm.heap)) JSSetIterator(vm, structure, iteratedObject, kind);
  55         instance->finishCreation(vm, iteratedObject);
  56         return instance;
  57     }
  58
  59     bool next(CallFrame* callFrame, JSValue& value)
  60     {
  61         WTF::KeyValuePair<JSValue, JSValue> pair;
  62         if (!m_iterator.next(pair))
  63             return false;
  64         if (m_kind == SetIterateValue || m_kind == SetIterateKey)
  65             value = pair.key;
  66         else
  67             value = createPair(callFrame, pair.key, pair.key);
  68         return true;
  69     }
  70
  71     void finish()
  72     {
  73         m_iterator.finish();
  74     }
  75
  76     SetIterationKind kind() const { return m_kind; }
  77     JSValue iteratedValue() const { return m_set.get(); }
  78     JSSetIterator* clone(ExecState*);
  79
  80     JSSet::SetData::IteratorData* iteratorData()
  81     {
  82         return &m_iterator;
  83     }
  84
  85 private:
  86     JSSetIterator(VM& vm, Structure* structure, JSSet* iteratedObject, SetIterationKind kind)
  87         : Base(vm, structure)
  88         , m_iterator(iteratedObject->m_setData.createIteratorData(this))
  89         , m_kind(kind)
  90     {
  91     }
  92
  93     static void destroy(JSCell*);
  94     JS_EXPORT_PRIVATE void finishCreation(VM&, JSSet*);
  95     JS_EXPORT_PRIVATE JSValue createPair(CallFrame*, JSValue, JSValue);
  96     static void visitChildren(JSCell*, SlotVisitor&);
  97
  98     WriteBarrier<JSSet> m_set;
  99     JSSet::SetData::IteratorData m_iterator;
 100     SetIterationKind m_kind;
 101 };
 102
 103 }
 104
 105 #endif // !defined(JSSetIterator_h)