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/*
* Copyright (C) 2005 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 "InsertTextCommand.h"
#include "CharacterNames.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSMutableStyleDeclaration.h"
#include "CSSPropertyNames.h"
#include "Document.h"
#include "Element.h"
#include "EditingText.h"
#include "Editor.h"
#include "Frame.h"
#include "Logging.h"
#include "HTMLInterchange.h"
#include "htmlediting.h"
#include "TextIterator.h"
#include "TypingCommand.h"
#include "visible_units.h"
namespace WebCore {
InsertTextCommand::InsertTextCommand(Document *document)
: CompositeEditCommand(document), m_charactersAdded(0)
{
}
void InsertTextCommand::doApply()
{
}
Position InsertTextCommand::prepareForTextInsertion(const Position& p)
{
Position pos = p;
// Prepare for text input by looking at the specified position.
// It may be necessary to insert a text node to receive characters.
if (!pos.node()->isTextNode()) {
RefPtr<Node> textNode = document()->createEditingTextNode("");
insertNodeAt(textNode.get(), pos);
return Position(textNode.get(), 0);
}
if (isTabSpanTextNode(pos.node())) {
RefPtr<Node> textNode = document()->createEditingTextNode("");
insertNodeAtTabSpanPosition(textNode.get(), pos);
return Position(textNode.get(), 0);
}
return pos;
}
// This avoids the expense of a full fledged delete operation, and avoids a layout that typically results
// from text removal.
bool InsertTextCommand::performTrivialReplace(const String& text, bool selectInsertedText)
{
if (!endingSelection().isRange())
return false;
if (text.contains('\t') || text.contains(' ') || text.contains('\n'))
return false;
Position start = endingSelection().start();
Position end = endingSelection().end();
if (start.node() != end.node() || !start.node()->isTextNode() || isTabSpanTextNode(start.node()))
return false;
replaceTextInNode(static_cast<Text*>(start.node()), start.deprecatedEditingOffset(), end.deprecatedEditingOffset() - start.deprecatedEditingOffset(), text);
Position endPosition(start.node(), start.deprecatedEditingOffset() + text.length());
// We could have inserted a part of composed character sequence,
// so we are basically treating ending selection as a range to avoid validation.
// <http://bugs.webkit.org/show_bug.cgi?id=15781>
VisibleSelection forcedEndingSelection;
forcedEndingSelection.setWithoutValidation(start, endPosition);
setEndingSelection(forcedEndingSelection);
if (!selectInsertedText)
setEndingSelection(VisibleSelection(endingSelection().visibleEnd()));
return true;
}
void InsertTextCommand::input(const String& text, bool selectInsertedText)
{
ASSERT(text.find('\n') == notFound);
if (!endingSelection().isNonOrphanedCaretOrRange())
return;
// Delete the current selection.
// FIXME: This delete operation blows away the typing style.
if (endingSelection().isRange()) {
if (performTrivialReplace(text, selectInsertedText))
return;
deleteSelection(false, true, true, false);
}
Position startPosition(endingSelection().start());
Position placeholder;
// We want to remove preserved newlines and brs that will collapse (and thus become unnecessary) when content
// is inserted just before them.
// FIXME: We shouldn't really have to do this, but removing placeholders is a workaround for 9661.
// If the caret is just before a placeholder, downstream will normalize the caret to it.
Position downstream(startPosition.downstream());
if (lineBreakExistsAtPosition(downstream)) {
// FIXME: This doesn't handle placeholders at the end of anonymous blocks.
VisiblePosition caret(startPosition);
if (isEndOfBlock(caret) && isStartOfParagraph(caret))
placeholder = downstream;
// Don't remove the placeholder yet, otherwise the block we're inserting into would collapse before
// we get a chance to insert into it. We check for a placeholder now, though, because doing so requires
// the creation of a VisiblePosition, and if we did that post-insertion it would force a layout.
}
// Insert the character at the leftmost candidate.
startPosition = startPosition.upstream();
// It is possible for the node that contains startPosition to contain only unrendered whitespace,
// and so deleteInsignificantText could remove it. Save the position before the node in case that happens.
Position positionBeforeStartNode(positionInParentBeforeNode(startPosition.node()));
deleteInsignificantText(startPosition.upstream(), startPosition.downstream());
if (!startPosition.node()->inDocument())
startPosition = positionBeforeStartNode;
if (!startPosition.isCandidate())
startPosition = startPosition.downstream();
startPosition = positionAvoidingSpecialElementBoundary(startPosition);
Position endPosition;
if (text == "\t") {
endPosition = insertTab(startPosition);
startPosition = endPosition.previous();
if (placeholder.isNotNull())
removePlaceholderAt(placeholder);
m_charactersAdded += 1;
} else {
// Make sure the document is set up to receive text
startPosition = prepareForTextInsertion(startPosition);
if (placeholder.isNotNull())
removePlaceholderAt(placeholder);
Text *textNode = static_cast<Text *>(startPosition.node());
int offset = startPosition.deprecatedEditingOffset();
insertTextIntoNode(textNode, offset, text);
endPosition = Position(textNode, offset + text.length());
// The insertion may require adjusting adjacent whitespace, if it is present.
rebalanceWhitespaceAt(endPosition);
// Rebalancing on both sides isn't necessary if we've inserted a space.
if (text != " ")
rebalanceWhitespaceAt(startPosition);
m_charactersAdded += text.length();
}
// We could have inserted a part of composed character sequence,
// so we are basically treating ending selection as a range to avoid validation.
// <http://bugs.webkit.org/show_bug.cgi?id=15781>
VisibleSelection forcedEndingSelection;
forcedEndingSelection.setWithoutValidation(startPosition, endPosition);
setEndingSelection(forcedEndingSelection);
// Handle the case where there is a typing style.
if (RefPtr<EditingStyle> typingStyle = document()->frame()->selection()->typingStyle()) {
typingStyle->prepareToApplyAt(endPosition, EditingStyle::PreserveWritingDirection);
if (!typingStyle->isEmpty())
applyStyle(typingStyle->style());
}
if (!selectInsertedText)
setEndingSelection(VisibleSelection(endingSelection().end(), endingSelection().affinity()));
}
Position InsertTextCommand::insertTab(const Position& pos)
{
Position insertPos = VisiblePosition(pos, DOWNSTREAM).deepEquivalent();
Node *node = insertPos.node();
unsigned int offset = insertPos.deprecatedEditingOffset();
// keep tabs coalesced in tab span
if (isTabSpanTextNode(node)) {
insertTextIntoNode(static_cast<Text *>(node), offset, "\t");
return Position(node, offset + 1);
}
// create new tab span
RefPtr<Element> spanNode = createTabSpanElement(document());
// place it
if (!node->isTextNode()) {
insertNodeAt(spanNode.get(), insertPos);
} else {
Text *textNode = static_cast<Text *>(node);
if (offset >= textNode->length()) {
insertNodeAfter(spanNode.get(), textNode);
} else {
// split node to make room for the span
// NOTE: splitTextNode uses textNode for the
// second node in the split, so we need to
// insert the span before it.
if (offset > 0)
splitTextNode(textNode, offset);
insertNodeBefore(spanNode, textNode);
}
}
// return the position following the new tab
return Position(spanNode->lastChild(), caretMaxOffset(spanNode->lastChild()));
}
bool InsertTextCommand::isInsertTextCommand() const
{
return true;
}
}
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