1 files changed, 182 insertions, 0 deletions
diff --git a/WebCore/editing/InsertLineBreakCommand.cpp b/WebCore/editing/InsertLineBreakCommand.cpp
new file mode 100644
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+++ b/WebCore/editing/InsertLineBreakCommand.cpp
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+/*
+ * 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 "Element.h"
+#include "Frame.h"
+#include "Text.h"
+#include "VisiblePosition.h"
+#include "Range.h"
+#include "htmlediting.h"
+#include "HTMLNames.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.
+    Position upstream(pos.upstream());
+    Node *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.
+    Position upstream(pos.upstream());
+    Node *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();
+    Selection selection = endingSelection();
+    if (selection.isNone())
+        return;
+    
+    VisiblePosition caret(selection.visibleStart());
+    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) && !lineBreakExistsAtPosition(caret)) {
+        bool needExtraLineBreak = !pos.node()->hasTagName(hrTag) && !pos.node()->hasTagName(tableTag);
+        
+        insertNodeAt(nodeToInsert.get(), pos);
+        
+        if (needExtraLineBreak)
+            insertNodeBefore(nodeToInsert->cloneNode(false).get(), nodeToInsert.get());
+        
+        VisiblePosition endingPosition(Position(nodeToInsert.get(), 0));
+        setEndingSelection(Selection(endingPosition));
+    } else if (pos.offset() <= 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(Selection(positionAfterNode(nodeToInsert.get()), DOWNSTREAM));
+    } else if (pos.offset() >= caretMaxOffset(pos.node())) {
+        insertNodeAt(nodeToInsert.get(), pos);
+        setEndingSelection(Selection(positionAfterNode(nodeToInsert.get()), DOWNSTREAM));
+    } else {
+        // Split a text node
+        ASSERT(pos.node()->isTextNode());
+        
+        // Do the split
+        ExceptionCode ec = 0;
+        Text *textNode = static_cast<Text *>(pos.node());
+        RefPtr<Text> textBeforeNode = document()->createTextNode(textNode->substringData(0, selection.start().offset(), ec));
+        deleteTextFromNode(textNode, 0, pos.offset());
+        insertNodeBefore(textBeforeNode.get(), textNode);
+        insertNodeBefore(nodeToInsert.get(), textNode);
+        Position endingPosition = Position(textNode, 0);
+        
+        // Handle whitespace that occurs after the split
+        updateLayout();
+        if (!endingPosition.isRenderedCharacter()) {
+            Position positionBeforeTextNode(positionBeforeNode(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(Selection(endingPosition, DOWNSTREAM));
+    }
+
+    // Handle the case where there is a typing style.
+    // FIXME: Improve typing style.
+    // See this bug: <rdar://problem/3769899> Implementation of typing style needs improvement
+    
+    CSSMutableStyleDeclaration* typingStyle = document()->frame()->typingStyle();
+    
+    if (typingStyle && typingStyle->length() > 0) {
+        Selection selectionBeforeStyle = endingSelection();
+        applyStyle(typingStyle, Position(nodeToInsert.get(), 0),
+            Position(nodeToInsert.get(), maxDeepOffset(nodeToInsert.get())));
+        setEndingSelection(selectionBeforeStyle);
+    }
+
+    rebalanceWhitespace();
+}
+
+}