Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 188 insertions, 0 deletions

diff --git a/Source/WebCore/editing/InsertLineBreakCommand.cpp b/Source/WebCore/editing/InsertLineBreakCommand.cpp
new file mode 100644
index 0000000..3070edf
--- /dev/null
+++ b/Source/WebCore/editing/InsertLineBreakCommand.cpp
@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2005, 2006 Apple Computer, 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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 "config.h"
+#include "InsertLineBreakCommand.h"
+
+#include "CSSMutableStyleDeclaration.h"
+#include "Document.h"
+#include "Frame.h"
+#include "HTMLElement.h"
+#include "HTMLNames.h"
+#include "Range.h"
+#include "RenderObject.h"
+#include "Text.h"
+#include "VisiblePosition.h"
+#include "htmlediting.h"
+#include "visible_units.h"
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+InsertLineBreakCommand::InsertLineBreakCommand(Document* document) 
+    : CompositeEditCommand(document)
+{
+}
+
+bool InsertLineBreakCommand::preservesTypingStyle() const
+{
+    return true;
+}
+
+void InsertLineBreakCommand::insertNodeAfterPosition(Node* node, const Position& pos)
+{
+    // Insert the BR after the caret position. In the case the
+    // position is a block, do an append. We don't want to insert
+    // the BR *after* the block.
+    Element* cb = pos.node()->enclosingBlockFlowElement();
+    if (cb == pos.node())
+        appendNode(node, cb);
+    else
+        insertNodeAfter(node, pos.node());
+}
+
+void InsertLineBreakCommand::insertNodeBeforePosition(Node* node, const Position& pos)
+{
+    // Insert the BR after the caret position. In the case the
+    // position is a block, do an append. We don't want to insert
+    // the BR *before* the block.
+    Element* cb = pos.node()->enclosingBlockFlowElement();
+    if (cb == pos.node())
+        appendNode(node, cb);
+    else
+        insertNodeBefore(node, pos.node());
+}
+
+// Whether we should insert a break element or a '\n'.
+bool InsertLineBreakCommand::shouldUseBreakElement(const Position& insertionPos)
+{
+    // An editing position like [input, 0] actually refers to the position before
+    // the input element, and in that case we need to check the input element's
+    // parent's renderer.
+    Position p(rangeCompliantEquivalent(insertionPos));
+    return p.node()->renderer() && !p.node()->renderer()->style()->preserveNewline();
+}
+
+void InsertLineBreakCommand::doApply()
+{
+    deleteSelection();
+    VisibleSelection selection = endingSelection();
+    if (!selection.isNonOrphanedCaretOrRange())
+        return;
+    
+    VisiblePosition caret(selection.visibleStart());
+    // FIXME: If the node is hidden, we should still be able to insert text. 
+    // For now, we return to avoid a crash.  https://bugs.webkit.org/show_bug.cgi?id=40342
+    if (caret.isNull())
+        return;
+
+    Position pos(caret.deepEquivalent());
+
+    pos = positionAvoidingSpecialElementBoundary(pos);
+    
+    pos = positionOutsideTabSpan(pos);
+
+    RefPtr<Node> nodeToInsert;
+    if (shouldUseBreakElement(pos))
+        nodeToInsert = createBreakElement(document());
+    else
+        nodeToInsert = document()->createTextNode("\n");
+    
+    // FIXME: Need to merge text nodes when inserting just after or before text.
+    
+    if (isEndOfParagraph(caret) && !lineBreakExistsAtVisiblePosition(caret)) {
+        bool needExtraLineBreak = !pos.node()->hasTagName(hrTag) && !pos.node()->hasTagName(tableTag);
+        
+        insertNodeAt(nodeToInsert.get(), pos);
+        
+        if (needExtraLineBreak)
+            insertNodeBefore(nodeToInsert->cloneNode(false), nodeToInsert);
+        
+        VisiblePosition endingPosition(Position(nodeToInsert.get(), 0));
+        setEndingSelection(VisibleSelection(endingPosition));
+    } else if (pos.deprecatedEditingOffset() <= caretMinOffset(pos.node())) {
+        insertNodeAt(nodeToInsert.get(), pos);
+        
+        // Insert an extra br or '\n' if the just inserted one collapsed.
+        if (!isStartOfParagraph(VisiblePosition(Position(nodeToInsert.get(), 0))))
+            insertNodeBefore(nodeToInsert->cloneNode(false).get(), nodeToInsert.get());
+        
+        setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM));
+    // If we're inserting after all of the rendered text in a text node, or into a non-text node,
+    // a simple insertion is sufficient.
+    } else if (pos.deprecatedEditingOffset() >= caretMaxOffset(pos.node()) || !pos.node()->isTextNode()) {
+        insertNodeAt(nodeToInsert.get(), pos);
+        setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM));
+    } else if (pos.node()->isTextNode()) {
+        // Split a text node
+        Text* textNode = static_cast<Text*>(pos.node());
+        splitTextNode(textNode, pos.deprecatedEditingOffset());
+        insertNodeBefore(nodeToInsert, textNode);
+        Position endingPosition = Position(textNode, 0);
+        
+        // Handle whitespace that occurs after the split
+        updateLayout();
+        if (!endingPosition.isRenderedCharacter()) {
+            Position positionBeforeTextNode(positionInParentBeforeNode(textNode));
+            // Clear out all whitespace and insert one non-breaking space
+            deleteInsignificantTextDownstream(endingPosition);
+            ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
+            // Deleting insignificant whitespace will remove textNode if it contains nothing but insignificant whitespace.
+            if (textNode->inDocument())
+                insertTextIntoNode(textNode, 0, nonBreakingSpaceString());
+            else {
+                RefPtr<Text> nbspNode = document()->createTextNode(nonBreakingSpaceString());
+                insertNodeAt(nbspNode.get(), positionBeforeTextNode);
+                endingPosition = Position(nbspNode.get(), 0);
+            }
+        }
+        
+        setEndingSelection(VisibleSelection(endingPosition, DOWNSTREAM));
+    }
+
+    // Handle the case where there is a typing style.
+
+    RefPtr<EditingStyle> typingStyle = document()->frame()->selection()->typingStyle();
+
+    if (typingStyle && !typingStyle->isEmpty()) {
+        // Apply the typing style to the inserted line break, so that if the selection
+        // leaves and then comes back, new input will have the right style.
+        // FIXME: We shouldn't always apply the typing style to the line break here,
+        // see <rdar://problem/5794462>.
+        applyStyle(typingStyle.get(), firstDeepEditingPositionForNode(nodeToInsert.get()), lastDeepEditingPositionForNode(nodeToInsert.get()));
+        // Even though this applyStyle operates on a Range, it still sets an endingSelection().
+        // It tries to set a VisibleSelection around the content it operated on. So, that VisibleSelection
+        // will either (a) select the line break we inserted, or it will (b) be a caret just 
+        // before the line break (if the line break is at the end of a block it isn't selectable).
+        // So, this next call sets the endingSelection() to a caret just after the line break 
+        // that we inserted, or just before it if it's at the end of a block.
+        setEndingSelection(endingSelection().visibleEnd());
+    }
+
+    rebalanceWhitespace();
+}
+
+}