Merge WebKit at r75993: Initial merge by git.

Change-Id: I602bbdc3974787a3b0450456a30a7868286921c3

1 files changed, 208 insertions, 0 deletions

diff --git a/Source/WebKit2/UIProcess/WebBackForwardList.cpp b/Source/WebKit2/UIProcess/WebBackForwardList.cpp
new file mode 100644
index 0000000..b351418
--- /dev/null
+++ b/Source/WebKit2/UIProcess/WebBackForwardList.cpp
@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2010 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "WebBackForwardList.h"
+
+#include "WebPageProxy.h"
+
+namespace WebKit {
+
+static const unsigned DefaultCapacity = 100;
+static const unsigned NoCurrentItemIndex = UINT_MAX;
+
+WebBackForwardList::WebBackForwardList(WebPageProxy* page)
+    : m_page(page)
+    , m_current(NoCurrentItemIndex)
+    , m_capacity(DefaultCapacity)
+    , m_closed(true)
+    , m_enabled(true)
+{
+}
+
+WebBackForwardList::~WebBackForwardList()
+{
+}
+
+void WebBackForwardList::pageClosed()
+{
+    if (m_page) {
+        size_t size = m_entries.size();
+        for (size_t i = 0; i < size; ++i)
+            m_page->backForwardRemovedItem(m_entries[i]->itemID());
+    }
+
+    m_page = 0;
+}
+
+void WebBackForwardList::addItem(WebBackForwardListItem* newItem)
+{
+    if (m_capacity == 0 || !m_enabled)
+        return;
+
+    // Toss anything in the forward list    
+    if (m_current != NoCurrentItemIndex) {
+        unsigned targetSize = m_current + 1;
+        while (m_entries.size() > targetSize) {
+            if (m_page)
+                m_page->backForwardRemovedItem(m_entries.last()->itemID());
+            m_entries.removeLast();
+        }
+    }
+
+    // Toss the first item if the list is getting too big, as long as we're not using it
+    // (or even if we are, if we only want 1 entry).
+    if (m_entries.size() == m_capacity && (m_current != 0 || m_capacity == 1)) {
+        if (m_page)
+            m_page->backForwardRemovedItem(m_entries[0]->itemID());
+        m_entries.remove(0);
+        m_current--;
+    }
+
+    m_entries.insert(m_current + 1, newItem);
+    m_current++;
+
+    if (m_page)
+        m_page->didChangeBackForwardList();
+}
+
+void WebBackForwardList::goToItem(WebBackForwardListItem* item)
+{
+    if (!m_entries.size() || !item)
+        return;
+        
+    unsigned index = 0;
+    for (; index < m_entries.size(); ++index) {
+        if (m_entries[index] == item)
+            break;
+    }
+    if (index < m_entries.size()) {
+        m_current = index;
+        if (m_page)
+            m_page->didChangeBackForwardList();
+    }
+}
+
+WebBackForwardListItem* WebBackForwardList::currentItem()
+{
+    if (m_current != NoCurrentItemIndex)
+        return m_entries[m_current].get();
+    return 0;
+}
+
+WebBackForwardListItem* WebBackForwardList::backItem()
+{
+    if (m_current && m_current != NoCurrentItemIndex)
+        return m_entries[m_current - 1].get();
+    return 0;
+}
+
+WebBackForwardListItem* WebBackForwardList::forwardItem()
+{
+    if (m_entries.size() && m_current < m_entries.size() - 1)
+        return m_entries[m_current + 1].get();
+    return 0;
+}
+
+WebBackForwardListItem* WebBackForwardList::itemAtIndex(int index)
+{
+    // Do range checks without doing math on index to avoid overflow.
+    if (index < -static_cast<int>(m_current))
+        return 0;
+    
+    if (index > forwardListCount())
+        return 0;
+        
+    return m_entries[index + m_current].get();
+}
+
+int WebBackForwardList::backListCount()
+{
+    return m_current == NoCurrentItemIndex ? 0 : m_current;
+}
+
+int WebBackForwardList::forwardListCount()
+{
+    return m_current == NoCurrentItemIndex ? 0 : static_cast<int>(m_entries.size()) - (m_current + 1);
+}
+
+PassRefPtr<ImmutableArray> WebBackForwardList::backListAsImmutableArrayWithLimit(unsigned limit)
+{
+    unsigned backListSize = static_cast<unsigned>(backListCount());
+    unsigned size = std::min(backListSize, limit);
+    if (!size)
+        return ImmutableArray::create();
+
+    Vector<RefPtr<APIObject> > vector;
+    vector.reserveInitialCapacity(size);
+
+    ASSERT(backListSize >= size);
+    for (unsigned i = backListSize - size; i < backListSize; ++i)
+        vector.uncheckedAppend(m_entries[i].get());
+
+    return ImmutableArray::adopt(vector);
+}
+
+PassRefPtr<ImmutableArray> WebBackForwardList::forwardListAsImmutableArrayWithLimit(unsigned limit)
+{
+    unsigned size = std::min(static_cast<unsigned>(forwardListCount()), limit);
+    if (!size)
+        return ImmutableArray::create();
+
+    Vector<RefPtr<APIObject> > vector;
+    vector.reserveInitialCapacity(size);
+
+    unsigned last = m_current + size;
+    ASSERT(last < m_entries.size());
+    for (unsigned i = m_current + 1; i <= last; ++i)
+        vector.uncheckedAppend(m_entries[i].get());
+
+    return ImmutableArray::adopt(vector);
+}
+
+void WebBackForwardList::clear()
+{
+    size_t size = m_entries.size();
+    if (size <= 1)
+        return;
+
+    RefPtr<WebBackForwardListItem> currentItem = this->currentItem();
+
+    if (m_page) {
+        for (size_t i = 0; i < size; ++i) {
+            if (m_entries[i] != currentItem)
+                m_page->backForwardRemovedItem(m_entries[i]->itemID());
+        }
+    }
+
+    m_entries.shrink(1);
+    m_entries[0] = currentItem.release();
+
+    m_current = 0;
+
+    if (m_page)
+        m_page->didChangeBackForwardList();
+}
+
+} // namespace WebKit