auto import from //depot/cupcake/@135843

1 files changed, 332 insertions, 0 deletions

diff --git a/WebCore/editing/InsertParagraphSeparatorCommand.cpp b/WebCore/editing/InsertParagraphSeparatorCommand.cpp
new file mode 100644
index 0000000..bcd2bfa
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+++ b/WebCore/editing/InsertParagraphSeparatorCommand.cpp
@@ -0,0 +1,332 @@
+/*
+ * 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 "InsertParagraphSeparatorCommand.h"
+
+#include "Document.h"
+#include "Logging.h"
+#include "CSSComputedStyleDeclaration.h"
+#include "CSSPropertyNames.h"
+#include "Text.h"
+#include "htmlediting.h"
+#include "HTMLElement.h"
+#include "HTMLNames.h"
+#include "InsertLineBreakCommand.h"
+#include "RenderObject.h"
+#include "visible_units.h"
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+InsertParagraphSeparatorCommand::InsertParagraphSeparatorCommand(Document *document, bool mustUseDefaultParagraphElement) 
+    : CompositeEditCommand(document)
+    , m_mustUseDefaultParagraphElement(mustUseDefaultParagraphElement)
+{
+}
+
+bool InsertParagraphSeparatorCommand::preservesTypingStyle() const
+{
+    return true;
+}
+
+void InsertParagraphSeparatorCommand::calculateStyleBeforeInsertion(const Position &pos)
+{
+    // It is only important to set a style to apply later if we're at the boundaries of
+    // a paragraph. Otherwise, content that is moved as part of the work of the command
+    // will lend their styles to the new paragraph without any extra work needed.
+    VisiblePosition visiblePos(pos, VP_DEFAULT_AFFINITY);
+    if (!isStartOfParagraph(visiblePos) && !isEndOfParagraph(visiblePos))
+        return;
+    
+    m_style = styleAtPosition(pos);
+}
+
+void InsertParagraphSeparatorCommand::applyStyleAfterInsertion(Node* originalEnclosingBlock)
+{
+    // Not only do we break out of header tags, but we also do not preserve the typing style,
+    // in order to match other browsers.
+    if (originalEnclosingBlock->hasTagName(h1Tag) ||
+        originalEnclosingBlock->hasTagName(h2Tag) ||
+        originalEnclosingBlock->hasTagName(h3Tag) ||
+        originalEnclosingBlock->hasTagName(h4Tag) ||
+        originalEnclosingBlock->hasTagName(h5Tag))
+        return;
+        
+    if (!m_style)
+        return;
+
+    computedStyle(endingSelection().start().node())->diff(m_style.get());
+    if (m_style->length() > 0)
+        applyStyle(m_style.get());
+}
+
+bool InsertParagraphSeparatorCommand::shouldUseDefaultParagraphElement(Node* enclosingBlock) const
+{
+    if (m_mustUseDefaultParagraphElement)
+        return true;
+    
+    // Assumes that if there was a range selection, it was already deleted.
+    if (!isEndOfBlock(endingSelection().visibleStart()))
+        return false;
+
+    return enclosingBlock->hasTagName(h1Tag) ||
+           enclosingBlock->hasTagName(h2Tag) ||
+           enclosingBlock->hasTagName(h3Tag) ||
+           enclosingBlock->hasTagName(h4Tag) ||
+           enclosingBlock->hasTagName(h5Tag);
+}
+
+void InsertParagraphSeparatorCommand::doApply()
+{
+    bool splitText = false;
+    if (endingSelection().isNone())
+        return;
+    
+    Position pos = endingSelection().start();
+        
+    EAffinity affinity = endingSelection().affinity();
+        
+    // Delete the current selection.
+    if (endingSelection().isRange()) {
+        calculateStyleBeforeInsertion(pos);
+        deleteSelection(false, true);
+        pos = endingSelection().start();
+        affinity = endingSelection().affinity();
+    }
+    
+    // FIXME: The rangeCompliantEquivalent conversion needs to be moved into enclosingBlock.
+    Node* startBlock = enclosingBlock(rangeCompliantEquivalent(pos).node());
+    Position canonicalPos = VisiblePosition(pos).deepEquivalent();
+    if (!startBlock || !startBlock->parentNode() || 
+        isTableCell(startBlock) ||
+        startBlock->hasTagName(formTag) || 
+        canonicalPos.node()->renderer() && canonicalPos.node()->renderer()->isTable() ||
+        canonicalPos.node()->hasTagName(hrTag)) {
+        applyCommandToComposite(InsertLineBreakCommand::create(document()));
+        return;
+    }
+    
+    // Use the leftmost candidate.
+    pos = pos.upstream();
+    if (!pos.isCandidate())
+        pos = pos.downstream();
+
+    // Adjust the insertion position after the delete
+    pos = positionAvoidingSpecialElementBoundary(pos);
+    VisiblePosition visiblePos(pos, affinity);
+    calculateStyleBeforeInsertion(pos);
+
+    //---------------------------------------------------------------------
+    // Handle special case of typing return on an empty list item
+    if (breakOutOfEmptyListItem())
+        return;
+
+    //---------------------------------------------------------------------
+    // Prepare for more general cases.
+    // FIXME: We shouldn't peel off the node here because then we lose track of
+    // the fact that it's the node that belongs to an editing position and
+    // not a rangeCompliantEquivalent.
+    Node *startNode = pos.node();
+
+    bool isFirstInBlock = isStartOfBlock(visiblePos);
+    bool isLastInBlock = isEndOfBlock(visiblePos);
+    bool nestNewBlock = false;
+
+    // Create block to be inserted.
+    RefPtr<Node> blockToInsert;
+    if (startBlock == startBlock->rootEditableElement()) {
+        blockToInsert = static_pointer_cast<Node>(createDefaultParagraphElement(document()));
+        nestNewBlock = true;
+    } else if (shouldUseDefaultParagraphElement(startBlock)) 
+        blockToInsert = static_pointer_cast<Node>(createDefaultParagraphElement(document()));
+    else
+        blockToInsert = startBlock->cloneNode(false);
+    
+    //---------------------------------------------------------------------
+    // Handle case when position is in the last visible position in its block,
+    // including when the block is empty. 
+    if (isLastInBlock) {
+        if (nestNewBlock) {
+            if (isFirstInBlock && !lineBreakExistsAtPosition(visiblePos)) {
+                // The block is empty.  Create an empty block to
+                // represent the paragraph that we're leaving.
+                RefPtr<Node> extraBlock = createDefaultParagraphElement(document());
+                appendNode(extraBlock.get(), startBlock);
+                appendBlockPlaceholder(extraBlock.get());
+            }
+            appendNode(blockToInsert.get(), startBlock);
+        } else
+            insertNodeAfter(blockToInsert.get(), startBlock);
+
+        appendBlockPlaceholder(blockToInsert.get());
+        setEndingSelection(Selection(Position(blockToInsert.get(), 0), DOWNSTREAM));
+        applyStyleAfterInsertion(startBlock);
+        return;
+    }
+
+    //---------------------------------------------------------------------
+    // Handle case when position is in the first visible position in its block, and
+    // similar case where previous position is in another, presumeably nested, block.
+    if (isFirstInBlock || !inSameBlock(visiblePos, visiblePos.previous())) {
+        Node *refNode;
+        if (isFirstInBlock && !nestNewBlock)
+            refNode = startBlock;
+        else if (pos.node() == startBlock && nestNewBlock) {
+            refNode = startBlock->childNode(pos.offset());
+            ASSERT(refNode); // must be true or we'd be in the end of block case
+        } else
+            refNode = pos.node();
+
+        // find ending selection position easily before inserting the paragraph
+        pos = pos.downstream();
+        
+        insertNodeBefore(blockToInsert.get(), refNode);
+        appendBlockPlaceholder(blockToInsert.get());
+        setEndingSelection(Selection(Position(blockToInsert.get(), 0), DOWNSTREAM));
+        applyStyleAfterInsertion(startBlock);
+        setEndingSelection(Selection(pos, DOWNSTREAM));
+        return;
+    }
+
+    //---------------------------------------------------------------------
+    // Handle the (more complicated) general case,
+
+    // All of the content in the current block after visiblePos is
+    // about to be wrapped in a new paragraph element.  Add a br before 
+    // it if visiblePos is at the start of a paragraph so that the 
+    // content will move down a line.
+    if (isStartOfParagraph(visiblePos)) {
+        RefPtr<Element> br = createBreakElement(document());
+        insertNodeAt(br.get(), pos);
+        pos = positionAfterNode(br.get());
+    }
+    
+    // Move downstream. Typing style code will take care of carrying along the 
+    // style of the upstream position.
+    pos = pos.downstream();
+    startNode = pos.node();
+
+    // Build up list of ancestors in between the start node and the start block.
+    Vector<Node*> ancestors;
+    if (startNode != startBlock)
+        for (Node* n = startNode->parentNode(); n && n != startBlock; n = n->parentNode())
+            ancestors.append(n);
+
+    // Make sure we do not cause a rendered space to become unrendered.
+    // FIXME: We need the affinity for pos, but pos.downstream() does not give it
+    Position leadingWhitespace = pos.leadingWhitespacePosition(VP_DEFAULT_AFFINITY);
+    // FIXME: leadingWhitespacePosition is returning the position before preserved newlines for positions
+    // after the preserved newline, causing the newline to be turned into a nbsp.
+    if (leadingWhitespace.isNotNull()) {
+        Text* textNode = static_cast<Text*>(leadingWhitespace.node());
+        ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
+        replaceTextInNode(textNode, leadingWhitespace.offset(), 1, nonBreakingSpaceString());
+    }
+    
+    // Split at pos if in the middle of a text node.
+    if (startNode->isTextNode()) {
+        Text *textNode = static_cast<Text *>(startNode);
+        bool atEnd = (unsigned)pos.offset() >= textNode->length();
+        if (pos.offset() > 0 && !atEnd) {
+            splitTextNode(textNode, pos.offset());
+            pos = Position(startNode, 0);
+            visiblePos = VisiblePosition(pos);
+            splitText = true;
+        }
+    }
+
+    // Put the added block in the tree.
+    if (nestNewBlock)
+        appendNode(blockToInsert.get(), startBlock);
+    else
+        insertNodeAfter(blockToInsert.get(), startBlock);
+
+    updateLayout();
+    
+    // Make clones of ancestors in between the start node and the start block.
+    RefPtr<Node> parent = blockToInsert;
+    for (size_t i = ancestors.size(); i != 0; --i) {
+        RefPtr<Node> child = ancestors[i - 1]->cloneNode(false); // shallow clone
+        appendNode(child.get(), parent.get());
+        parent = child.release();
+    }
+
+    // If the paragraph separator was inserted at the end of a paragraph, an empty line must be
+    // created.  All of the nodes, starting at visiblePos, are about to be added to the new paragraph 
+    // element.  If the first node to be inserted won't be one that will hold an empty line open, add a br.
+    if (isEndOfParagraph(visiblePos) && !lineBreakExistsAtPosition(visiblePos))
+        appendNode(createBreakElement(document()).get(), blockToInsert.get());
+        
+    // Move the start node and the siblings of the start node.
+    if (startNode != startBlock) {
+        Node *n = startNode;
+        if (pos.offset() >= caretMaxOffset(startNode))
+            n = startNode->nextSibling();
+
+        while (n && n != blockToInsert) {
+            Node *next = n->nextSibling();
+            removeNode(n);
+            appendNode(n, parent.get());
+            n = next;
+        }
+    }            
+
+    // Move everything after the start node.
+    if (!ancestors.isEmpty()) {
+        Node* leftParent = ancestors.first();
+        while (leftParent && leftParent != startBlock) {
+            parent = parent->parentNode();
+            Node* n = leftParent->nextSibling();
+            while (n && n != blockToInsert) {
+                Node* next = n->nextSibling();
+                removeNode(n);
+                appendNode(n, parent.get());
+                n = next;
+            }
+            leftParent = leftParent->parentNode();
+        }
+    }
+
+    // Handle whitespace that occurs after the split
+    if (splitText) {
+        updateLayout();
+        pos = Position(startNode, 0);
+        if (!pos.isRenderedCharacter()) {
+            // Clear out all whitespace and insert one non-breaking space
+            ASSERT(startNode);
+            ASSERT(startNode->isTextNode());
+            ASSERT(!startNode->renderer() || startNode->renderer()->style()->collapseWhiteSpace());
+            deleteInsignificantTextDownstream(pos);
+            insertTextIntoNode(static_cast<Text*>(startNode), 0, nonBreakingSpaceString());
+        }
+    }
+
+    setEndingSelection(Selection(Position(blockToInsert.get(), 0), DOWNSTREAM));
+    applyStyleAfterInsertion(startBlock);
+}
+
+} // namespace WebCore