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/*
* Copyright (C) 2005, 2006, 2008, 2009 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. ``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
* 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 "ApplyStyleCommand.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSParser.h"
#include "CSSValuePool.h"
#include "Document.h"
#include "Editing.h"
#include "Editor.h"
#include "ElementIterator.h"
#include "Frame.h"
#include "HTMLFontElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLInterchange.h"
#include "HTMLNames.h"
#include "HTMLSpanElement.h"
#include "NodeList.h"
#include "NodeTraversal.h"
#include "RenderObject.h"
#include "RenderText.h"
#include "StyleProperties.h"
#include "StyleResolver.h"
#include "Text.h"
#include "TextIterator.h"
#include "TextNodeTraversal.h"
#include "VisibleUnits.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
using namespace HTMLNames;
static int toIdentifier(RefPtr<CSSValue>&& value)
{
return is<CSSPrimitiveValue>(value) ? downcast<CSSPrimitiveValue>(*value).valueID() : 0;
}
static String& styleSpanClassString()
{
static NeverDestroyed<String> styleSpanClassString(AppleStyleSpanClass);
return styleSpanClassString;
}
bool isLegacyAppleStyleSpan(const Node* node)
{
if (!is<HTMLSpanElement>(node))
return false;
return downcast<HTMLSpanElement>(*node).attributeWithoutSynchronization(classAttr) == styleSpanClassString();
}
static bool hasNoAttributeOrOnlyStyleAttribute(const StyledElement& element, ShouldStyleAttributeBeEmpty shouldStyleAttributeBeEmpty)
{
if (!element.hasAttributes())
return true;
unsigned matchedAttributes = 0;
if (element.attributeWithoutSynchronization(classAttr) == styleSpanClassString())
matchedAttributes++;
if (element.hasAttribute(styleAttr) && (shouldStyleAttributeBeEmpty == AllowNonEmptyStyleAttribute
|| !element.inlineStyle() || element.inlineStyle()->isEmpty()))
matchedAttributes++;
ASSERT(matchedAttributes <= element.attributeCount());
return matchedAttributes == element.attributeCount();
}
bool isStyleSpanOrSpanWithOnlyStyleAttribute(const Element& element)
{
if (!is<HTMLSpanElement>(element))
return false;
return hasNoAttributeOrOnlyStyleAttribute(downcast<HTMLSpanElement>(element), AllowNonEmptyStyleAttribute);
}
static inline bool isSpanWithoutAttributesOrUnstyledStyleSpan(const Element& element)
{
if (!is<HTMLSpanElement>(element))
return false;
return hasNoAttributeOrOnlyStyleAttribute(downcast<HTMLSpanElement>(element), StyleAttributeShouldBeEmpty);
}
bool isEmptyFontTag(const Element* element, ShouldStyleAttributeBeEmpty shouldStyleAttributeBeEmpty)
{
if (!is<HTMLFontElement>(element))
return false;
return hasNoAttributeOrOnlyStyleAttribute(downcast<HTMLFontElement>(*element), shouldStyleAttributeBeEmpty);
}
static Ref<HTMLElement> createFontElement(Document& document)
{
return createHTMLElement(document, fontTag);
}
Ref<HTMLElement> createStyleSpanElement(Document& document)
{
return createHTMLElement(document, spanTag);
}
ApplyStyleCommand::ApplyStyleCommand(Document& document, const EditingStyle* style, EditAction editingAction, EPropertyLevel propertyLevel)
: CompositeEditCommand(document, editingAction)
, m_style(style->copy())
, m_propertyLevel(propertyLevel)
, m_start(endingSelection().start().downstream())
, m_end(endingSelection().end().upstream())
, m_useEndingSelection(true)
, m_removeOnly(false)
{
}
ApplyStyleCommand::ApplyStyleCommand(Document& document, const EditingStyle* style, const Position& start, const Position& end, EditAction editingAction, EPropertyLevel propertyLevel)
: CompositeEditCommand(document, editingAction)
, m_style(style->copy())
, m_propertyLevel(propertyLevel)
, m_start(start)
, m_end(end)
, m_useEndingSelection(false)
, m_removeOnly(false)
{
}
ApplyStyleCommand::ApplyStyleCommand(Ref<Element>&& element, bool removeOnly, EditAction editingAction)
: CompositeEditCommand(element->document(), editingAction)
, m_style(EditingStyle::create())
, m_propertyLevel(PropertyDefault)
, m_start(endingSelection().start().downstream())
, m_end(endingSelection().end().upstream())
, m_useEndingSelection(true)
, m_styledInlineElement(WTFMove(element))
, m_removeOnly(removeOnly)
{
}
ApplyStyleCommand::ApplyStyleCommand(Document& document, const EditingStyle* style, IsInlineElementToRemoveFunction isInlineElementToRemoveFunction, EditAction editingAction)
: CompositeEditCommand(document, editingAction)
, m_style(style->copy())
, m_propertyLevel(PropertyDefault)
, m_start(endingSelection().start().downstream())
, m_end(endingSelection().end().upstream())
, m_useEndingSelection(true)
, m_removeOnly(true)
, m_isInlineElementToRemoveFunction(isInlineElementToRemoveFunction)
{
}
void ApplyStyleCommand::updateStartEnd(const Position& newStart, const Position& newEnd)
{
ASSERT(comparePositions(newEnd, newStart) >= 0);
if (!m_useEndingSelection && (newStart != m_start || newEnd != m_end))
m_useEndingSelection = true;
bool wasBaseFirst = startingSelection().isBaseFirst() || !startingSelection().isDirectional();
setEndingSelection(VisibleSelection(wasBaseFirst ? newStart : newEnd, wasBaseFirst ? newEnd : newStart, VP_DEFAULT_AFFINITY, endingSelection().isDirectional()));
m_start = newStart;
m_end = newEnd;
}
Position ApplyStyleCommand::startPosition()
{
if (m_useEndingSelection)
return endingSelection().start();
return m_start;
}
Position ApplyStyleCommand::endPosition()
{
if (m_useEndingSelection)
return endingSelection().end();
return m_end;
}
void ApplyStyleCommand::doApply()
{
switch (m_propertyLevel) {
case PropertyDefault: {
// Apply the block-centric properties of the style.
auto blockStyle = m_style->extractAndRemoveBlockProperties();
if (!blockStyle->isEmpty())
applyBlockStyle(blockStyle);
// Apply any remaining styles to the inline elements.
if (!m_style->isEmpty() || m_styledInlineElement || m_isInlineElementToRemoveFunction) {
applyRelativeFontStyleChange(m_style.get());
applyInlineStyle(*m_style);
}
break;
}
case ForceBlockProperties:
// Force all properties to be applied as block styles.
applyBlockStyle(*m_style);
break;
}
}
void ApplyStyleCommand::applyBlockStyle(EditingStyle& style)
{
// update document layout once before removing styles
// so that we avoid the expense of updating before each and every call
// to check a computed style
document().updateLayoutIgnorePendingStylesheets();
// get positions we want to use for applying style
Position start = startPosition();
Position end = endPosition();
if (comparePositions(end, start) < 0) {
Position swap = start;
start = end;
end = swap;
}
VisiblePosition visibleStart(start);
VisiblePosition visibleEnd(end);
if (visibleStart.isNull() || visibleStart.isOrphan() || visibleEnd.isNull() || visibleEnd.isOrphan())
return;
// Save and restore the selection endpoints using their indices in the editable root, since
// addBlockStyleIfNeeded may moveParagraphs, which can remove these endpoints.
// Calculate start and end indices from the start of the tree that they're in.
auto* scope = highestEditableRoot(visibleStart.deepEquivalent());
if (!scope)
return;
auto startRange = Range::create(document(), firstPositionInNode(scope), visibleStart.deepEquivalent().parentAnchoredEquivalent());
auto endRange = Range::create(document(), firstPositionInNode(scope), visibleEnd.deepEquivalent().parentAnchoredEquivalent());
int startIndex = TextIterator::rangeLength(startRange.ptr(), true);
int endIndex = TextIterator::rangeLength(endRange.ptr(), true);
VisiblePosition paragraphStart(startOfParagraph(visibleStart));
VisiblePosition nextParagraphStart(endOfParagraph(paragraphStart).next());
if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd))
visibleEnd = visibleEnd.previous(CannotCrossEditingBoundary);
VisiblePosition beyondEnd(endOfParagraph(visibleEnd).next());
while (paragraphStart.isNotNull() && paragraphStart != beyondEnd) {
StyleChange styleChange(&style, paragraphStart.deepEquivalent());
if (styleChange.cssStyle() || m_removeOnly) {
RefPtr<Node> block = enclosingBlock(paragraphStart.deepEquivalent().deprecatedNode());
if (!m_removeOnly) {
RefPtr<Node> newBlock = moveParagraphContentsToNewBlockIfNecessary(paragraphStart.deepEquivalent());
if (newBlock)
block = newBlock;
}
ASSERT(!block || is<HTMLElement>(*block));
if (is<HTMLElement>(block)) {
removeCSSStyle(style, downcast<HTMLElement>(*block));
if (!m_removeOnly)
addBlockStyle(styleChange, downcast<HTMLElement>(*block));
}
if (nextParagraphStart.isOrphan())
nextParagraphStart = endOfParagraph(paragraphStart).next();
}
paragraphStart = nextParagraphStart;
nextParagraphStart = endOfParagraph(paragraphStart).next();
}
{
auto startRange = TextIterator::rangeFromLocationAndLength(scope, startIndex, 0, true);
auto endRange = TextIterator::rangeFromLocationAndLength(scope, endIndex, 0, true);
if (startRange && endRange)
updateStartEnd(startRange->startPosition(), endRange->startPosition());
}
}
static Ref<MutableStyleProperties> copyStyleOrCreateEmpty(const StyleProperties* style)
{
if (!style)
return MutableStyleProperties::create();
return style->mutableCopy();
}
void ApplyStyleCommand::applyRelativeFontStyleChange(EditingStyle* style)
{
static const float MinimumFontSize = 0.1f;
if (!style || !style->hasFontSizeDelta())
return;
Position start = startPosition();
Position end = endPosition();
if (comparePositions(end, start) < 0) {
Position swap = start;
start = end;
end = swap;
}
// Join up any adjacent text nodes.
if (is<Text>(*start.deprecatedNode())) {
joinChildTextNodes(start.deprecatedNode()->parentNode(), start, end);
start = startPosition();
end = endPosition();
}
if (start.isNull() || end.isNull())
return;
if (is<Text>(*end.deprecatedNode()) && start.deprecatedNode()->parentNode() != end.deprecatedNode()->parentNode()) {
joinChildTextNodes(end.deprecatedNode()->parentNode(), start, end);
start = startPosition();
end = endPosition();
}
if (start.isNull() || end.isNull())
return;
// Split the start text nodes if needed to apply style.
if (isValidCaretPositionInTextNode(start)) {
splitTextAtStart(start, end);
start = startPosition();
end = endPosition();
}
if (start.isNull() || end.isNull())
return;
if (isValidCaretPositionInTextNode(end)) {
splitTextAtEnd(start, end);
start = startPosition();
end = endPosition();
}
if (start.isNull() || end.isNull())
return;
// Calculate loop end point.
// If the end node is before the start node (can only happen if the end node is
// an ancestor of the start node), we gather nodes up to the next sibling of the end node
Node* beyondEnd;
ASSERT(start.deprecatedNode());
ASSERT(end.deprecatedNode());
if (start.deprecatedNode()->isDescendantOf(*end.deprecatedNode()))
beyondEnd = NodeTraversal::nextSkippingChildren(*end.deprecatedNode());
else
beyondEnd = NodeTraversal::next(*end.deprecatedNode());
start = start.upstream(); // Move upstream to ensure we do not add redundant spans.
Node* startNode = start.deprecatedNode();
// Make sure we're not already at the end or the next NodeTraversal::next() will traverse past it.
if (startNode == beyondEnd)
return;
if (is<Text>(*startNode) && start.deprecatedEditingOffset() >= caretMaxOffset(*startNode)) {
// Move out of text node if range does not include its characters.
startNode = NodeTraversal::next(*startNode);
if (!startNode)
return;
}
// Store away font size before making any changes to the document.
// This ensures that changes to one node won't effect another.
HashMap<Node*, float> startingFontSizes;
for (Node* node = startNode; node != beyondEnd; node = NodeTraversal::next(*node)) {
ASSERT(node);
startingFontSizes.set(node, computedFontSize(node));
}
// These spans were added by us. If empty after font size changes, they can be removed.
Vector<Ref<HTMLElement>> unstyledSpans;
Node* lastStyledNode = nullptr;
for (Node* node = startNode; node != beyondEnd; node = NodeTraversal::next(*node)) {
ASSERT(node);
RefPtr<HTMLElement> element;
if (is<HTMLElement>(*node)) {
// Only work on fully selected nodes.
if (!nodeFullySelected(downcast<HTMLElement>(*node), start, end))
continue;
element = &downcast<HTMLElement>(*node);
} else if (is<Text>(*node) && node->renderer() && node->parentNode() != lastStyledNode) {
// Last styled node was not parent node of this text node, but we wish to style this
// text node. To make this possible, add a style span to surround this text node.
auto span = createStyleSpanElement(document());
surroundNodeRangeWithElement(*node, *node, span.copyRef());
element = WTFMove(span);
} else {
// Only handle HTML elements and text nodes.
continue;
}
lastStyledNode = node;
RefPtr<MutableStyleProperties> inlineStyle = copyStyleOrCreateEmpty(element->inlineStyle());
float currentFontSize = computedFontSize(node);
float desiredFontSize = std::max(MinimumFontSize, startingFontSizes.get(node) + style->fontSizeDelta());
RefPtr<CSSValue> value = inlineStyle->getPropertyCSSValue(CSSPropertyFontSize);
if (value) {
element->removeInlineStyleProperty(CSSPropertyFontSize);
currentFontSize = computedFontSize(node);
}
if (currentFontSize != desiredFontSize) {
inlineStyle->setProperty(CSSPropertyFontSize, CSSValuePool::singleton().createValue(desiredFontSize, CSSUnitType::CSS_PX), false);
setNodeAttribute(*element, styleAttr, inlineStyle->asText());
}
if (inlineStyle->isEmpty()) {
removeNodeAttribute(*element, styleAttr);
if (isSpanWithoutAttributesOrUnstyledStyleSpan(*element))
unstyledSpans.append(element.releaseNonNull());
}
}
for (auto& unstyledSpan : unstyledSpans)
removeNodePreservingChildren(unstyledSpan);
}
static ContainerNode* dummySpanAncestorForNode(const Node* node)
{
while (node && (!is<Element>(*node) || !isStyleSpanOrSpanWithOnlyStyleAttribute(downcast<Element>(*node))))
node = node->parentNode();
return node ? node->parentNode() : nullptr;
}
void ApplyStyleCommand::cleanupUnstyledAppleStyleSpans(ContainerNode* dummySpanAncestor)
{
if (!dummySpanAncestor)
return;
// Dummy spans are created when text node is split, so that style information
// can be propagated, which can result in more splitting. If a dummy span gets
// cloned/split, the new node is always a sibling of it. Therefore, we scan
// all the children of the dummy's parent
Vector<Element*> toRemove;
for (auto& child : childrenOfType<Element>(*dummySpanAncestor)) {
if (isSpanWithoutAttributesOrUnstyledStyleSpan(child))
toRemove.append(&child);
}
for (auto& element : toRemove)
removeNodePreservingChildren(*element);
}
HTMLElement* ApplyStyleCommand::splitAncestorsWithUnicodeBidi(Node* node, bool before, WritingDirection allowedDirection)
{
// We are allowed to leave the highest ancestor with unicode-bidi unsplit if it is unicode-bidi: embed and direction: allowedDirection.
// In that case, we return the unsplit ancestor. Otherwise, we return 0.
Element* block = enclosingBlock(node);
if (!block || block == node)
return 0;
Node* highestAncestorWithUnicodeBidi = nullptr;
Node* nextHighestAncestorWithUnicodeBidi = nullptr;
int highestAncestorUnicodeBidi = 0;
for (Node* n = node->parentNode(); n != block; n = n->parentNode()) {
int unicodeBidi = toIdentifier(ComputedStyleExtractor(n).propertyValue(CSSPropertyUnicodeBidi));
if (unicodeBidi && unicodeBidi != CSSValueNormal) {
highestAncestorUnicodeBidi = unicodeBidi;
nextHighestAncestorWithUnicodeBidi = highestAncestorWithUnicodeBidi;
highestAncestorWithUnicodeBidi = n;
}
}
if (!highestAncestorWithUnicodeBidi)
return 0;
HTMLElement* unsplitAncestor = nullptr;
if (allowedDirection != WritingDirection::Natural && highestAncestorUnicodeBidi != CSSValueBidiOverride && is<HTMLElement>(*highestAncestorWithUnicodeBidi)) {
auto highestAncestorDirection = EditingStyle::create(highestAncestorWithUnicodeBidi, EditingStyle::AllProperties)->textDirection();
if (highestAncestorDirection && *highestAncestorDirection == allowedDirection) {
if (!nextHighestAncestorWithUnicodeBidi)
return downcast<HTMLElement>(highestAncestorWithUnicodeBidi);
unsplitAncestor = downcast<HTMLElement>(highestAncestorWithUnicodeBidi);
highestAncestorWithUnicodeBidi = nextHighestAncestorWithUnicodeBidi;
}
}
// Split every ancestor through highest ancestor with embedding.
RefPtr<Node> currentNode = node;
while (currentNode) {
RefPtr<Element> parent = downcast<Element>(currentNode->parentNode());
if (before ? currentNode->previousSibling() : currentNode->nextSibling())
splitElement(*parent, before ? *currentNode : *currentNode->nextSibling());
if (parent == highestAncestorWithUnicodeBidi)
break;
currentNode = parent;
}
return unsplitAncestor;
}
void ApplyStyleCommand::removeEmbeddingUpToEnclosingBlock(Node* node, Node* unsplitAncestor)
{
Element* block = enclosingBlock(node);
if (!block || block == node)
return;
Node* parent = nullptr;
for (Node* ancestor = node->parentNode(); ancestor != block && ancestor != unsplitAncestor; ancestor = parent) {
parent = ancestor->parentNode();
if (!is<StyledElement>(*ancestor))
continue;
StyledElement& element = downcast<StyledElement>(*ancestor);
int unicodeBidi = toIdentifier(ComputedStyleExtractor(&element).propertyValue(CSSPropertyUnicodeBidi));
if (!unicodeBidi || unicodeBidi == CSSValueNormal)
continue;
// FIXME: This code should really consider the mapped attribute 'dir', the inline style declaration,
// and all matching style rules in order to determine how to best set the unicode-bidi property to 'normal'.
// For now, it assumes that if the 'dir' attribute is present, then removing it will suffice, and
// otherwise it sets the property in the inline style declaration.
if (element.hasAttributeWithoutSynchronization(dirAttr)) {
// FIXME: If this is a BDO element, we should probably just remove it if it has no
// other attributes, like we (should) do with B and I elements.
removeNodeAttribute(element, dirAttr);
} else {
RefPtr<MutableStyleProperties> inlineStyle = copyStyleOrCreateEmpty(element.inlineStyle());
inlineStyle->setProperty(CSSPropertyUnicodeBidi, CSSValueNormal);
inlineStyle->removeProperty(CSSPropertyDirection);
setNodeAttribute(element, styleAttr, inlineStyle->asText());
if (isSpanWithoutAttributesOrUnstyledStyleSpan(element))
removeNodePreservingChildren(element);
}
}
}
static Node* highestEmbeddingAncestor(Node* startNode, Node* enclosingNode)
{
for (Node* n = startNode; n && n != enclosingNode; n = n->parentNode()) {
if (n->isHTMLElement() && toIdentifier(ComputedStyleExtractor(n).propertyValue(CSSPropertyUnicodeBidi)) == CSSValueEmbed)
return n;
}
return 0;
}
void ApplyStyleCommand::applyInlineStyle(EditingStyle& style)
{
RefPtr<ContainerNode> startDummySpanAncestor;
RefPtr<ContainerNode> endDummySpanAncestor;
// update document layout once before removing styles
// so that we avoid the expense of updating before each and every call
// to check a computed style
document().updateLayoutIgnorePendingStylesheets();
// adjust to the positions we want to use for applying style
Position start = startPosition();
Position end = endPosition();
if (start.isNull() || end.isNull())
return;
if (comparePositions(end, start) < 0) {
Position swap = start;
start = end;
end = swap;
}
// split the start node and containing element if the selection starts inside of it
bool splitStart = isValidCaretPositionInTextNode(start);
if (splitStart) {
if (shouldSplitTextElement(start.deprecatedNode()->parentElement(), style))
splitTextElementAtStart(start, end);
else
splitTextAtStart(start, end);
start = startPosition();
end = endPosition();
startDummySpanAncestor = dummySpanAncestorForNode(start.deprecatedNode());
}
if (start.isNull() || end.isNull())
return;
// split the end node and containing element if the selection ends inside of it
bool splitEnd = isValidCaretPositionInTextNode(end);
if (splitEnd) {
if (shouldSplitTextElement(end.deprecatedNode()->parentElement(), style))
splitTextElementAtEnd(start, end);
else
splitTextAtEnd(start, end);
start = startPosition();
end = endPosition();
endDummySpanAncestor = dummySpanAncestorForNode(end.deprecatedNode());
}
if (start.isNull() || end.isNull())
return;
// Remove style from the selection.
// Use the upstream position of the start for removing style.
// This will ensure we remove all traces of the relevant styles from the selection
// and prevent us from adding redundant ones, as described in:
// <rdar://problem/3724344> Bolding and unbolding creates extraneous tags
Position removeStart = start.upstream();
auto textDirection = style.textDirection();
RefPtr<EditingStyle> styleWithoutEmbedding;
RefPtr<EditingStyle> embeddingStyle;
if (textDirection.hasValue()) {
// Leave alone an ancestor that provides the desired single level embedding, if there is one.
auto* startUnsplitAncestor = splitAncestorsWithUnicodeBidi(start.deprecatedNode(), true, *textDirection);
auto* endUnsplitAncestor = splitAncestorsWithUnicodeBidi(end.deprecatedNode(), false, *textDirection);
removeEmbeddingUpToEnclosingBlock(start.deprecatedNode(), startUnsplitAncestor);
removeEmbeddingUpToEnclosingBlock(end.deprecatedNode(), endUnsplitAncestor);
// Avoid removing the dir attribute and the unicode-bidi and direction properties from the unsplit ancestors.
Position embeddingRemoveStart = removeStart;
if (startUnsplitAncestor && nodeFullySelected(*startUnsplitAncestor, removeStart, end))
embeddingRemoveStart = positionInParentAfterNode(startUnsplitAncestor);
Position embeddingRemoveEnd = end;
if (endUnsplitAncestor && nodeFullySelected(*endUnsplitAncestor, removeStart, end))
embeddingRemoveEnd = positionInParentBeforeNode(endUnsplitAncestor).downstream();
if (embeddingRemoveEnd != removeStart || embeddingRemoveEnd != end) {
styleWithoutEmbedding = style.copy();
embeddingStyle = styleWithoutEmbedding->extractAndRemoveTextDirection();
if (comparePositions(embeddingRemoveStart, embeddingRemoveEnd) <= 0)
removeInlineStyle(*embeddingStyle, embeddingRemoveStart, embeddingRemoveEnd);
}
}
removeInlineStyle(styleWithoutEmbedding ? *styleWithoutEmbedding : style, removeStart, end);
start = startPosition();
end = endPosition();
if (start.isNull() || start.isOrphan() || end.isNull() || end.isOrphan())
return;
if (splitStart && mergeStartWithPreviousIfIdentical(start, end)) {
start = startPosition();
end = endPosition();
}
if (splitEnd) {
mergeEndWithNextIfIdentical(start, end);
start = startPosition();
end = endPosition();
}
if (start.isNull() || end.isNull())
return;
// update document layout once before running the rest of the function
// so that we avoid the expense of updating before each and every call
// to check a computed style
document().updateLayoutIgnorePendingStylesheets();
RefPtr<EditingStyle> styleToApply = &style;
if (textDirection.hasValue()) {
// Avoid applying the unicode-bidi and direction properties beneath ancestors that already have them.
Node* embeddingStartNode = highestEmbeddingAncestor(start.deprecatedNode(), enclosingBlock(start.deprecatedNode()));
Node* embeddingEndNode = highestEmbeddingAncestor(end.deprecatedNode(), enclosingBlock(end.deprecatedNode()));
if (embeddingStartNode || embeddingEndNode) {
Position embeddingApplyStart = embeddingStartNode ? positionInParentAfterNode(embeddingStartNode) : start;
Position embeddingApplyEnd = embeddingEndNode ? positionInParentBeforeNode(embeddingEndNode) : end;
ASSERT(embeddingApplyStart.isNotNull() && embeddingApplyEnd.isNotNull());
if (!embeddingStyle) {
styleWithoutEmbedding = style.copy();
embeddingStyle = styleWithoutEmbedding->extractAndRemoveTextDirection();
}
fixRangeAndApplyInlineStyle(*embeddingStyle, embeddingApplyStart, embeddingApplyEnd);
styleToApply = styleWithoutEmbedding;
}
}
fixRangeAndApplyInlineStyle(*styleToApply, start, end);
// Remove dummy style spans created by splitting text elements.
cleanupUnstyledAppleStyleSpans(startDummySpanAncestor.get());
if (endDummySpanAncestor != startDummySpanAncestor)
cleanupUnstyledAppleStyleSpans(endDummySpanAncestor.get());
}
void ApplyStyleCommand::fixRangeAndApplyInlineStyle(EditingStyle& style, const Position& start, const Position& end)
{
Node* startNode = start.deprecatedNode();
if (start.deprecatedEditingOffset() >= caretMaxOffset(*startNode)) {
startNode = NodeTraversal::next(*startNode);
if (!startNode || comparePositions(end, firstPositionInOrBeforeNode(startNode)) < 0)
return;
}
Node* pastEndNode = end.deprecatedNode();
if (end.deprecatedEditingOffset() >= caretMaxOffset(*pastEndNode))
pastEndNode = NodeTraversal::nextSkippingChildren(*pastEndNode);
// FIXME: Callers should perform this operation on a Range that includes the br
// if they want style applied to the empty line.
// FIXME: Should this be using startNode instead of start.deprecatedNode()?
if (start == end && start.deprecatedNode()->hasTagName(brTag))
pastEndNode = NodeTraversal::next(*start.deprecatedNode());
// Start from the highest fully selected ancestor so that we can modify the fully selected node.
// e.g. When applying font-size: large on <font color="blue">hello</font>, we need to include the font element in our run
// to generate <font color="blue" size="4">hello</font> instead of <font color="blue"><font size="4">hello</font></font>
auto range = Range::create(startNode->document(), start, end);
auto* editableRoot = startNode->rootEditableElement();
if (startNode != editableRoot) {
while (editableRoot && startNode->parentNode() != editableRoot && isNodeVisiblyContainedWithin(*startNode->parentNode(), range))
startNode = startNode->parentNode();
}
applyInlineStyleToNodeRange(style, *startNode, pastEndNode);
}
static bool containsNonEditableRegion(Node& node)
{
if (!node.hasEditableStyle())
return true;
Node* sibling = NodeTraversal::nextSkippingChildren(node);
for (Node* descendant = node.firstChild(); descendant && descendant != sibling; descendant = NodeTraversal::next(*descendant)) {
if (!descendant->hasEditableStyle())
return true;
}
return false;
}
struct InlineRunToApplyStyle {
InlineRunToApplyStyle(Node* start, Node* end, Node* pastEndNode)
: start(start)
, end(end)
, pastEndNode(pastEndNode)
{
ASSERT(start->parentNode() == end->parentNode());
}
bool startAndEndAreStillInDocument()
{
return start && end && start->isConnected() && end->isConnected();
}
RefPtr<Node> start;
RefPtr<Node> end;
RefPtr<Node> pastEndNode;
Position positionForStyleComputation;
RefPtr<Node> dummyElement;
StyleChange change;
};
void ApplyStyleCommand::applyInlineStyleToNodeRange(EditingStyle& style, Node& startNode, Node* pastEndNode)
{
if (m_removeOnly)
return;
document().updateLayoutIgnorePendingStylesheets();
Vector<InlineRunToApplyStyle> runs;
RefPtr<Node> node = &startNode;
for (RefPtr<Node> next; node && node != pastEndNode; node = next) {
next = NodeTraversal::next(*node);
if (!node->renderer() || !node->hasEditableStyle())
continue;
if (!node->hasRichlyEditableStyle() && is<HTMLElement>(*node)) {
// This is a plaintext-only region. Only proceed if it's fully selected.
// pastEndNode is the node after the last fully selected node, so if it's inside node then
// node isn't fully selected.
if (pastEndNode && pastEndNode->isDescendantOf(*node))
break;
// Add to this element's inline style and skip over its contents.
HTMLElement& element = downcast<HTMLElement>(*node);
RefPtr<MutableStyleProperties> inlineStyle = copyStyleOrCreateEmpty(element.inlineStyle());
if (MutableStyleProperties* otherStyle = style.style())
inlineStyle->mergeAndOverrideOnConflict(*otherStyle);
setNodeAttribute(element, styleAttr, inlineStyle->asText());
next = NodeTraversal::nextSkippingChildren(*node);
continue;
}
if (isBlock(node.get()))
continue;
if (node->hasChildNodes()) {
if (node->contains(pastEndNode) || containsNonEditableRegion(*node) || !node->parentNode()->hasEditableStyle())
continue;
if (editingIgnoresContent(*node)) {
next = NodeTraversal::nextSkippingChildren(*node);
continue;
}
}
Node* runStart = node.get();
Node* runEnd = node.get();
Node* sibling = node->nextSibling();
while (sibling && sibling != pastEndNode && !sibling->contains(pastEndNode) && (!isBlock(sibling) || sibling->hasTagName(brTag)) && !containsNonEditableRegion(*sibling)) {
runEnd = sibling;
sibling = runEnd->nextSibling();
}
next = NodeTraversal::nextSkippingChildren(*runEnd);
Node* pastEndNode = NodeTraversal::nextSkippingChildren(*runEnd);
if (!shouldApplyInlineStyleToRun(style, runStart, pastEndNode))
continue;
runs.append(InlineRunToApplyStyle(runStart, runEnd, pastEndNode));
}
for (auto& run : runs) {
removeConflictingInlineStyleFromRun(style, run.start, run.end, run.pastEndNode.get());
if (run.startAndEndAreStillInDocument())
run.positionForStyleComputation = positionToComputeInlineStyleChange(*run.start, run.dummyElement);
}
document().updateLayoutIgnorePendingStylesheets();
for (auto& run : runs)
run.change = StyleChange(&style, run.positionForStyleComputation);
for (auto& run : runs) {
if (run.dummyElement)
removeNode(*run.dummyElement);
if (run.startAndEndAreStillInDocument())
applyInlineStyleChange(run.start.releaseNonNull(), run.end.releaseNonNull(), run.change, AddStyledElement);
}
}
bool ApplyStyleCommand::isStyledInlineElementToRemove(Element* element) const
{
return (m_styledInlineElement && element->hasTagName(m_styledInlineElement->tagQName()))
|| (m_isInlineElementToRemoveFunction && m_isInlineElementToRemoveFunction(element));
}
bool ApplyStyleCommand::shouldApplyInlineStyleToRun(EditingStyle& style, Node* runStart, Node* pastEndNode)
{
ASSERT(runStart);
for (Node* node = runStart; node && node != pastEndNode; node = NodeTraversal::next(*node)) {
if (node->hasChildNodes())
continue;
// We don't consider m_isInlineElementToRemoveFunction here because we never apply style when m_isInlineElementToRemoveFunction is specified
if (!style.styleIsPresentInComputedStyleOfNode(*node))
return true;
if (m_styledInlineElement && !enclosingElementWithTag(positionBeforeNode(node), m_styledInlineElement->tagQName()))
return true;
}
return false;
}
void ApplyStyleCommand::removeConflictingInlineStyleFromRun(EditingStyle& style, RefPtr<Node>& runStart, RefPtr<Node>& runEnd, Node* pastEndNode)
{
ASSERT(runStart && runEnd);
RefPtr<Node> next = runStart;
for (RefPtr<Node> node = next; node && node->isConnected() && node != pastEndNode; node = next) {
if (editingIgnoresContent(*node)) {
ASSERT(!node->contains(pastEndNode));
next = NodeTraversal::nextSkippingChildren(*node);
} else
next = NodeTraversal::next(*node);
if (!is<HTMLElement>(*node))
continue;
RefPtr<Node> previousSibling = node->previousSibling();
RefPtr<Node> nextSibling = node->nextSibling();
RefPtr<ContainerNode> parent = node->parentNode();
removeInlineStyleFromElement(style, downcast<HTMLElement>(*node), RemoveAlways);
if (!node->isConnected()) {
// FIXME: We might need to update the start and the end of current selection here but need a test.
if (runStart == node)
runStart = previousSibling ? previousSibling->nextSibling() : parent->firstChild();
if (runEnd == node)
runEnd = nextSibling ? nextSibling->previousSibling() : parent->lastChild();
}
}
}
bool ApplyStyleCommand::removeInlineStyleFromElement(EditingStyle& style, HTMLElement& element, InlineStyleRemovalMode mode, EditingStyle* extractedStyle)
{
if (!element.parentNode() || !isEditableNode(*element.parentNode()))
return false;
if (isStyledInlineElementToRemove(&element)) {
if (mode == RemoveNone)
return true;
if (extractedStyle)
extractedStyle->mergeInlineStyleOfElement(element, EditingStyle::OverrideValues);
removeNodePreservingChildren(element);
return true;
}
bool removed = false;
if (removeImplicitlyStyledElement(style, element, mode, extractedStyle))
removed = true;
if (!element.isConnected())
return removed;
// If the node was converted to a span, the span may still contain relevant
// styles which must be removed (e.g. <b style='font-weight: bold'>)
if (removeCSSStyle(style, element, mode, extractedStyle))
removed = true;
return removed;
}
void ApplyStyleCommand::replaceWithSpanOrRemoveIfWithoutAttributes(HTMLElement& element)
{
if (hasNoAttributeOrOnlyStyleAttribute(element, StyleAttributeShouldBeEmpty))
removeNodePreservingChildren(element);
else {
HTMLElement* newSpanElement = replaceElementWithSpanPreservingChildrenAndAttributes(element);
ASSERT_UNUSED(newSpanElement, newSpanElement && newSpanElement->isConnected());
}
}
bool ApplyStyleCommand::removeImplicitlyStyledElement(EditingStyle& style, HTMLElement& element, InlineStyleRemovalMode mode, EditingStyle* extractedStyle)
{
if (mode == RemoveNone) {
ASSERT(!extractedStyle);
return style.conflictsWithImplicitStyleOfElement(element) || style.conflictsWithImplicitStyleOfAttributes(element);
}
ASSERT(mode == RemoveIfNeeded || mode == RemoveAlways);
if (style.conflictsWithImplicitStyleOfElement(element, extractedStyle, mode == RemoveAlways ? EditingStyle::ExtractMatchingStyle : EditingStyle::DoNotExtractMatchingStyle)) {
replaceWithSpanOrRemoveIfWithoutAttributes(element);
return true;
}
// unicode-bidi and direction are pushed down separately so don't push down with other styles
Vector<QualifiedName> attributes;
if (!style.extractConflictingImplicitStyleOfAttributes(element, extractedStyle ? EditingStyle::PreserveWritingDirection : EditingStyle::DoNotPreserveWritingDirection, extractedStyle, attributes, mode == RemoveAlways ? EditingStyle::ExtractMatchingStyle : EditingStyle::DoNotExtractMatchingStyle))
return false;
for (auto& attribute : attributes)
removeNodeAttribute(element, attribute);
if (isEmptyFontTag(&element) || isSpanWithoutAttributesOrUnstyledStyleSpan(element))
removeNodePreservingChildren(element);
return true;
}
bool ApplyStyleCommand::removeCSSStyle(EditingStyle& style, HTMLElement& element, InlineStyleRemovalMode mode, EditingStyle* extractedStyle)
{
if (mode == RemoveNone)
return style.conflictsWithInlineStyleOfElement(element);
RefPtr<MutableStyleProperties> newInlineStyle;
if (!style.conflictsWithInlineStyleOfElement(element, newInlineStyle, extractedStyle))
return false;
if (newInlineStyle->isEmpty())
removeNodeAttribute(element, styleAttr);
else
setNodeAttribute(element, styleAttr, newInlineStyle->asText());
if (isSpanWithoutAttributesOrUnstyledStyleSpan(element))
removeNodePreservingChildren(element);
return true;
}
HTMLElement* ApplyStyleCommand::highestAncestorWithConflictingInlineStyle(EditingStyle& style, Node* node)
{
if (!node)
return nullptr;
HTMLElement* result = nullptr;
Node* unsplittableElement = unsplittableElementForPosition(firstPositionInOrBeforeNode(node));
for (Node* ancestor = node; ancestor; ancestor = ancestor->parentNode()) {
if (is<HTMLElement>(*ancestor) && shouldRemoveInlineStyleFromElement(style, downcast<HTMLElement>(*ancestor)))
result = downcast<HTMLElement>(ancestor);
// Should stop at the editable root (cannot cross editing boundary) and
// also stop at the unsplittable element to be consistent with other UAs
if (ancestor == unsplittableElement)
break;
}
return result;
}
void ApplyStyleCommand::applyInlineStyleToPushDown(Node& node, EditingStyle* style)
{
node.document().updateStyleIfNeeded();
if (!style || style->isEmpty() || !node.renderer() || is<HTMLIFrameElement>(node))
return;
RefPtr<EditingStyle> newInlineStyle = style;
if (is<HTMLElement>(node) && downcast<HTMLElement>(node).inlineStyle()) {
newInlineStyle = style->copy();
newInlineStyle->mergeInlineStyleOfElement(downcast<HTMLElement>(node), EditingStyle::OverrideValues);
}
// Since addInlineStyleIfNeeded can't add styles to block-flow render objects, add style attribute instead.
// FIXME: applyInlineStyleToRange should be used here instead.
if ((node.renderer()->isRenderBlockFlow() || node.hasChildNodes()) && is<HTMLElement>(node)) {
setNodeAttribute(downcast<HTMLElement>(node), styleAttr, newInlineStyle->style()->asText());
return;
}
if (node.renderer()->isText() && static_cast<RenderText*>(node.renderer())->isAllCollapsibleWhitespace())
return;
if (node.renderer()->isBR() && !node.renderer()->style().preserveNewline())
return;
// We can't wrap node with the styled element here because new styled element will never be removed if we did.
// If we modified the child pointer in pushDownInlineStyleAroundNode to point to new style element
// then we fall into an infinite loop where we keep removing and adding styled element wrapping node.
addInlineStyleIfNeeded(newInlineStyle.get(), node, node, DoNotAddStyledElement);
}
void ApplyStyleCommand::pushDownInlineStyleAroundNode(EditingStyle& style, Node* targetNode)
{
HTMLElement* highestAncestor = highestAncestorWithConflictingInlineStyle(style, targetNode);
if (!highestAncestor)
return;
// The outer loop is traversing the tree vertically from highestAncestor to targetNode
RefPtr<Node> current = highestAncestor;
// Along the way, styled elements that contain targetNode are removed and accumulated into elementsToPushDown.
// Each child of the removed element, exclusing ancestors of targetNode, is then wrapped by clones of elements in elementsToPushDown.
Vector<Ref<Element>> elementsToPushDown;
while (current && current != targetNode && current->contains(targetNode)) {
auto currentChildren = collectChildNodes(*current);
RefPtr<StyledElement> styledElement;
if (is<StyledElement>(*current) && isStyledInlineElementToRemove(downcast<Element>(current.get()))) {
styledElement = downcast<StyledElement>(current.get());
elementsToPushDown.append(*styledElement);
}
auto styleToPushDown = EditingStyle::create();
if (is<HTMLElement>(*current))
removeInlineStyleFromElement(style, downcast<HTMLElement>(*current), RemoveIfNeeded, styleToPushDown.ptr());
// The inner loop will go through children on each level
// FIXME: we should aggregate inline child elements together so that we don't wrap each child separately.
for (Ref<Node>& childRef : currentChildren) {
Node& child = childRef;
if (!child.parentNode())
continue;
if (!child.contains(targetNode) && elementsToPushDown.size()) {
for (auto& element : elementsToPushDown) {
auto wrapper = element->cloneElementWithoutChildren(document());
wrapper->removeAttribute(styleAttr);
surroundNodeRangeWithElement(child, child, WTFMove(wrapper));
}
}
// Apply style to all nodes containing targetNode and their siblings but NOT to targetNode
// But if we've removed styledElement then always apply the style.
if (&child != targetNode || styledElement)
applyInlineStyleToPushDown(child, styleToPushDown.ptr());
// We found the next node for the outer loop (contains targetNode)
// When reached targetNode, stop the outer loop upon the completion of the current inner loop
if (&child == targetNode || child.contains(targetNode))
current = &child;
}
}
}
void ApplyStyleCommand::removeInlineStyle(EditingStyle& style, const Position& start, const Position& end)
{
ASSERT(start.isNotNull());
ASSERT(end.isNotNull());
ASSERT(start.anchorNode()->isConnected());
ASSERT(end.anchorNode()->isConnected());
ASSERT(comparePositions(start, end) <= 0);
// FIXME: We should assert that start/end are not in the middle of a text node.
Position pushDownStart = start.downstream();
// If the pushDownStart is at the end of a text node, then this node is not fully selected.
// Move it to the next deep quivalent position to avoid removing the style from this node.
// e.g. if pushDownStart was at Position("hello", 5) in <b>hello<div>world</div></b>, we want Position("world", 0) instead.
auto* pushDownStartContainer = pushDownStart.containerNode();
if (is<Text>(pushDownStartContainer) && pushDownStart.computeOffsetInContainerNode() == pushDownStartContainer->maxCharacterOffset())
pushDownStart = nextVisuallyDistinctCandidate(pushDownStart);
// If pushDownEnd is at the start of a text node, then this node is not fully selected.
// Move it to the previous deep equivalent position to avoid removing the style from this node.
Position pushDownEnd = end.upstream();
auto* pushDownEndContainer = pushDownEnd.containerNode();
if (is<Text>(pushDownEndContainer) && !pushDownEnd.computeOffsetInContainerNode())
pushDownEnd = previousVisuallyDistinctCandidate(pushDownEnd);
pushDownInlineStyleAroundNode(style, pushDownStart.deprecatedNode());
pushDownInlineStyleAroundNode(style, pushDownEnd.deprecatedNode());
// The s and e variables store the positions used to set the ending selection after style removal
// takes place. This will help callers to recognize when either the start node or the end node
// are removed from the document during the work of this function.
// If pushDownInlineStyleAroundNode has pruned start.deprecatedNode() or end.deprecatedNode(),
// use pushDownStart or pushDownEnd instead, which pushDownInlineStyleAroundNode won't prune.
Position s = start.isNull() || start.isOrphan() ? pushDownStart : start;
Position e = end.isNull() || end.isOrphan() ? pushDownEnd : end;
RefPtr<Node> node = start.deprecatedNode();
while (node) {
RefPtr<Node> next;
if (editingIgnoresContent(*node)) {
ASSERT(node == end.deprecatedNode() || !node->contains(end.deprecatedNode()));
next = NodeTraversal::nextSkippingChildren(*node);
} else
next = NodeTraversal::next(*node);
if (is<HTMLElement>(*node) && nodeFullySelected(downcast<HTMLElement>(*node), start, end)) {
Ref<HTMLElement> element = downcast<HTMLElement>(*node);
RefPtr<Node> prev = NodeTraversal::previousPostOrder(element);
RefPtr<Node> next = NodeTraversal::next(element);
RefPtr<EditingStyle> styleToPushDown;
RefPtr<Node> childNode;
if (isStyledInlineElementToRemove(element.ptr())) {
styleToPushDown = EditingStyle::create();
childNode = element->firstChild();
}
removeInlineStyleFromElement(style, element, RemoveIfNeeded, styleToPushDown.get());
if (!element->isConnected()) {
if (s.deprecatedNode() == element.ptr()) {
// Since elem must have been fully selected, and it is at the start
// of the selection, it is clear we can set the new s offset to 0.
ASSERT(s.anchorType() == Position::PositionIsBeforeAnchor || s.offsetInContainerNode() <= 0);
s = firstPositionInOrBeforeNode(next.get());
}
if (e.deprecatedNode() == element.ptr()) {
// Since elem must have been fully selected, and it is at the end
// of the selection, it is clear we can set the new e offset to
// the max range offset of prev.
ASSERT(s.anchorType() == Position::PositionIsAfterAnchor || !offsetIsBeforeLastNodeOffset(s.offsetInContainerNode(), s.containerNode()));
e = lastPositionInOrAfterNode(prev.get());
}
}
if (styleToPushDown) {
for (; childNode; childNode = childNode->nextSibling())
applyInlineStyleToPushDown(*childNode, styleToPushDown.get());
}
}
if (node == end.deprecatedNode())
break;
node = next.get();
}
updateStartEnd(s, e);
}
bool ApplyStyleCommand::nodeFullySelected(Element& element, const Position& start, const Position& end) const
{
// The tree may have changed and Position::upstream() relies on an up-to-date layout.
element.document().updateLayoutIgnorePendingStylesheets();
return comparePositions(firstPositionInOrBeforeNode(&element), start) >= 0
&& comparePositions(lastPositionInOrAfterNode(&element).upstream(), end) <= 0;
}
bool ApplyStyleCommand::nodeFullyUnselected(Element& element, const Position& start, const Position& end) const
{
// The tree may have changed and Position::upstream() relies on an up-to-date layout.
element.document().updateLayoutIgnorePendingStylesheets();
return comparePositions(lastPositionInOrAfterNode(&element).upstream(), start) < 0
|| comparePositions(firstPositionInOrBeforeNode(&element), end) > 0;
}
void ApplyStyleCommand::splitTextAtStart(const Position& start, const Position& end)
{
ASSERT(is<Text>(start.containerNode()));
Position newEnd;
if (end.anchorType() == Position::PositionIsOffsetInAnchor && start.containerNode() == end.containerNode())
newEnd = Position(end.containerText(), end.offsetInContainerNode() - start.offsetInContainerNode());
else
newEnd = end;
RefPtr<Text> text = start.containerText();
splitTextNode(*text, start.offsetInContainerNode());
updateStartEnd(firstPositionInNode(text.get()), newEnd);
}
void ApplyStyleCommand::splitTextAtEnd(const Position& start, const Position& end)
{
ASSERT(is<Text>(end.containerNode()));
bool shouldUpdateStart = start.anchorType() == Position::PositionIsOffsetInAnchor && start.containerNode() == end.containerNode();
Text& text = downcast<Text>(*end.deprecatedNode());
splitTextNode(text, end.offsetInContainerNode());
Node* prevNode = text.previousSibling();
if (!is<Text>(prevNode))
return;
Position newStart = shouldUpdateStart ? Position(downcast<Text>(prevNode), start.offsetInContainerNode()) : start;
updateStartEnd(newStart, lastPositionInNode(prevNode));
}
void ApplyStyleCommand::splitTextElementAtStart(const Position& start, const Position& end)
{
ASSERT(is<Text>(start.containerNode()));
Position newEnd;
if (start.containerNode() == end.containerNode())
newEnd = Position(end.containerText(), end.offsetInContainerNode() - start.offsetInContainerNode());
else
newEnd = end;
splitTextNodeContainingElement(*start.containerText(), start.offsetInContainerNode());
updateStartEnd(positionBeforeNode(start.containerNode()), newEnd);
}
void ApplyStyleCommand::splitTextElementAtEnd(const Position& start, const Position& end)
{
ASSERT(is<Text>(end.containerNode()));
bool shouldUpdateStart = start.containerNode() == end.containerNode();
splitTextNodeContainingElement(*end.containerText(), end.offsetInContainerNode());
Node* parentElement = end.containerNode()->parentNode();
if (!parentElement || !parentElement->previousSibling())
return;
Node* firstTextNode = parentElement->previousSibling()->lastChild();
if (!is<Text>(firstTextNode))
return;
Position newStart = shouldUpdateStart ? Position(downcast<Text>(firstTextNode), start.offsetInContainerNode()) : start;
updateStartEnd(newStart, positionAfterNode(firstTextNode));
}
bool ApplyStyleCommand::shouldSplitTextElement(Element* element, EditingStyle& style)
{
if (!is<HTMLElement>(element))
return false;
return shouldRemoveInlineStyleFromElement(style, downcast<HTMLElement>(*element));
}
bool ApplyStyleCommand::isValidCaretPositionInTextNode(const Position& position)
{
Node* node = position.containerNode();
if (position.anchorType() != Position::PositionIsOffsetInAnchor || !is<Text>(node))
return false;
int offsetInText = position.offsetInContainerNode();
return offsetInText > caretMinOffset(*node) && offsetInText < caretMaxOffset(*node);
}
bool ApplyStyleCommand::mergeStartWithPreviousIfIdentical(const Position& start, const Position& end)
{
auto* startNode = start.containerNode();
int startOffset = start.computeOffsetInContainerNode();
if (startOffset)
return false;
if (isAtomicNode(startNode)) {
// note: prior siblings could be unrendered elements. it's silly to miss the
// merge opportunity just for that.
if (startNode->previousSibling())
return false;
startNode = startNode->parentNode();
}
auto* previousSibling = startNode->previousSibling();
if (!previousSibling || !areIdenticalElements(*startNode, *previousSibling))
return false;
auto& previousElement = downcast<Element>(*previousSibling);
auto& element = downcast<Element>(*startNode);
auto* startChild = element.firstChild();
ASSERT(startChild);
mergeIdenticalElements(previousElement, element);
int startOffsetAdjustment = startChild->computeNodeIndex();
int endOffsetAdjustment = startNode == end.deprecatedNode() ? startOffsetAdjustment : 0;
updateStartEnd({ startNode, startOffsetAdjustment, Position::PositionIsOffsetInAnchor},
{ end.deprecatedNode(), end.deprecatedEditingOffset() + endOffsetAdjustment, Position::PositionIsOffsetInAnchor });
return true;
}
bool ApplyStyleCommand::mergeEndWithNextIfIdentical(const Position& start, const Position& end)
{
Node* endNode = end.containerNode();
if (isAtomicNode(endNode)) {
int endOffset = end.computeOffsetInContainerNode();
if (offsetIsBeforeLastNodeOffset(endOffset, endNode) || end.deprecatedNode()->nextSibling())
return false;
endNode = end.deprecatedNode()->parentNode();
}
if (endNode->hasTagName(brTag))
return false;
Node* nextSibling = endNode->nextSibling();
if (!nextSibling || !areIdenticalElements(*endNode, *nextSibling))
return false;
auto& nextElement = downcast<Element>(*nextSibling);
auto& element = downcast<Element>(*endNode);
Node* nextChild = nextElement.firstChild();
mergeIdenticalElements(element, nextElement);
bool shouldUpdateStart = start.containerNode() == endNode;
int endOffset = nextChild ? nextChild->computeNodeIndex() : nextElement.countChildNodes();
updateStartEnd(shouldUpdateStart ? Position(&nextElement, start.offsetInContainerNode(), Position::PositionIsOffsetInAnchor) : start,
{ &nextElement, endOffset, Position::PositionIsOffsetInAnchor });
return true;
}
void ApplyStyleCommand::surroundNodeRangeWithElement(Node& startNode, Node& endNode, Ref<Element>&& elementToInsert)
{
Ref<Node> protectedStartNode = startNode;
Ref<Element> element = WTFMove(elementToInsert);
insertNodeBefore(element.copyRef(), startNode);
RefPtr<Node> node = &startNode;
while (node) {
RefPtr<Node> next = node->nextSibling();
if (isEditableNode(*node)) {
removeNode(*node);
appendNode(*node, element.copyRef());
}
if (node == &endNode)
break;
node = next;
}
RefPtr<Node> nextSibling = element->nextSibling();
RefPtr<Node> previousSibling = element->previousSibling();
if (nextSibling && nextSibling->hasEditableStyle() && areIdenticalElements(element, *nextSibling))
mergeIdenticalElements(element, downcast<Element>(*nextSibling));
if (is<Element>(previousSibling) && previousSibling->hasEditableStyle()) {
auto* mergedElement = previousSibling->nextSibling();
ASSERT(mergedElement);
if (mergedElement->hasEditableStyle() && areIdenticalElements(*previousSibling, *mergedElement))
mergeIdenticalElements(downcast<Element>(*previousSibling), downcast<Element>(*mergedElement));
}
// FIXME: We should probably call updateStartEnd if the start or end was in the node
// range so that the endingSelection() is canonicalized. See the comments at the end of
// VisibleSelection::validate().
}
void ApplyStyleCommand::addBlockStyle(const StyleChange& styleChange, HTMLElement& block)
{
ASSERT(styleChange.cssStyle());
// Do not check for legacy styles here. Those styles, like <B> and <I>, only apply for
// inline content.
String cssStyle = styleChange.cssStyle()->asText();
StringBuilder cssText;
cssText.append(cssStyle);
if (const StyleProperties* decl = block.inlineStyle()) {
if (!cssStyle.isEmpty())
cssText.append(' ');
cssText.append(decl->asText());
}
setNodeAttribute(block, styleAttr, cssText.toString());
}
void ApplyStyleCommand::addInlineStyleIfNeeded(EditingStyle* style, Node& start, Node& end, EAddStyledElement addStyledElement)
{
if (!start.isConnected() || !end.isConnected())
return;
Ref<Node> protectedStart = start;
RefPtr<Node> dummyElement;
StyleChange styleChange(style, positionToComputeInlineStyleChange(start, dummyElement));
if (dummyElement)
removeNode(*dummyElement);
applyInlineStyleChange(start, end, styleChange, addStyledElement);
}
Position ApplyStyleCommand::positionToComputeInlineStyleChange(Node& startNode, RefPtr<Node>& dummyElement)
{
// It's okay to obtain the style at the startNode because we've removed all relevant styles from the current run.
if (!is<Element>(startNode)) {
dummyElement = createStyleSpanElement(document());
insertNodeAt(*dummyElement, positionBeforeNode(&startNode));
return firstPositionInOrBeforeNode(dummyElement.get());
}
return firstPositionInOrBeforeNode(&startNode);
}
void ApplyStyleCommand::applyInlineStyleChange(Node& passedStart, Node& passedEnd, StyleChange& styleChange, EAddStyledElement addStyledElement)
{
RefPtr<Node> startNode = &passedStart;
RefPtr<Node> endNode = &passedEnd;
ASSERT(startNode->isConnected());
ASSERT(endNode->isConnected());
// Find appropriate font and span elements top-down.
HTMLFontElement* fontContainer = nullptr;
HTMLElement* styleContainer = nullptr;
while (startNode == endNode) {
if (is<HTMLElement>(*startNode)) {
auto& container = downcast<HTMLElement>(*startNode);
if (is<HTMLFontElement>(container))
fontContainer = &downcast<HTMLFontElement>(container);
if (is<HTMLSpanElement>(container) || (!is<HTMLSpanElement>(styleContainer) && container.hasChildNodes()))
styleContainer = &container;
}
auto* startNodeFirstChild = startNode->firstChild();
if (!startNodeFirstChild)
break;
endNode = startNode->lastChild();
startNode = startNodeFirstChild;
}
// Font tags need to go outside of CSS so that CSS font sizes override leagcy font sizes.
if (styleChange.applyFontColor() || styleChange.applyFontFace() || styleChange.applyFontSize()) {
if (fontContainer) {
if (styleChange.applyFontColor())
setNodeAttribute(*fontContainer, colorAttr, styleChange.fontColor());
if (styleChange.applyFontFace())
setNodeAttribute(*fontContainer, faceAttr, styleChange.fontFace());
if (styleChange.applyFontSize())
setNodeAttribute(*fontContainer, sizeAttr, styleChange.fontSize());
} else {
auto fontElement = createFontElement(document());
if (styleChange.applyFontColor())
fontElement->setAttributeWithoutSynchronization(colorAttr, styleChange.fontColor());
if (styleChange.applyFontFace())
fontElement->setAttributeWithoutSynchronization(faceAttr, styleChange.fontFace());
if (styleChange.applyFontSize())
fontElement->setAttributeWithoutSynchronization(sizeAttr, styleChange.fontSize());
surroundNodeRangeWithElement(*startNode, *endNode, WTFMove(fontElement));
}
}
if (auto styleToMerge = styleChange.cssStyle()) {
if (styleContainer) {
if (auto existingStyle = styleContainer->inlineStyle()) {
auto inlineStyle = EditingStyle::create(existingStyle);
inlineStyle->overrideWithStyle(*styleToMerge);
setNodeAttribute(*styleContainer, styleAttr, inlineStyle->style()->asText());
} else
setNodeAttribute(*styleContainer, styleAttr, styleToMerge->asText());
} else {
auto styleElement = createStyleSpanElement(document());
styleElement->setAttribute(styleAttr, styleToMerge->asText());
surroundNodeRangeWithElement(*startNode, *endNode, WTFMove(styleElement));
}
}
if (styleChange.applyBold())
surroundNodeRangeWithElement(*startNode, *endNode, createHTMLElement(document(), bTag));
if (styleChange.applyItalic())
surroundNodeRangeWithElement(*startNode, *endNode, createHTMLElement(document(), iTag));
if (styleChange.applyUnderline())
surroundNodeRangeWithElement(*startNode, *endNode, createHTMLElement(document(), uTag));
if (styleChange.applyLineThrough())
surroundNodeRangeWithElement(*startNode, *endNode, createHTMLElement(document(), strikeTag));
if (styleChange.applySubscript())
surroundNodeRangeWithElement(*startNode, *endNode, createHTMLElement(document(), subTag));
else if (styleChange.applySuperscript())
surroundNodeRangeWithElement(*startNode, *endNode, createHTMLElement(document(), supTag));
if (m_styledInlineElement && addStyledElement == AddStyledElement)
surroundNodeRangeWithElement(*startNode, *endNode, m_styledInlineElement->cloneElementWithoutChildren(document()));
}
float ApplyStyleCommand::computedFontSize(Node* node)
{
if (!node)
return 0;
auto value = ComputedStyleExtractor(node).propertyValue(CSSPropertyFontSize);
return downcast<CSSPrimitiveValue>(*value).floatValue(CSSUnitType::CSS_PX);
}
void ApplyStyleCommand::joinChildTextNodes(Node* node, const Position& start, const Position& end)
{
if (!node)
return;
Position newStart = start;
Position newEnd = end;
Vector<Ref<Text>> textNodes;
for (Text* textNode = TextNodeTraversal::firstChild(*node); textNode; textNode = TextNodeTraversal::nextSibling(*textNode))
textNodes.append(*textNode);
for (auto& childText : textNodes) {
Node* next = childText->nextSibling();
if (!is<Text>(next))
continue;
Text& nextText = downcast<Text>(*next);
if (start.anchorType() == Position::PositionIsOffsetInAnchor && next == start.containerNode())
newStart = Position(childText.ptr(), childText->length() + start.offsetInContainerNode());
if (end.anchorType() == Position::PositionIsOffsetInAnchor && next == end.containerNode())
newEnd = Position(childText.ptr(), childText->length() + end.offsetInContainerNode());
String textToMove = nextText.data();
insertTextIntoNode(childText, childText->length(), textToMove);
removeNode(*next);
// don't move child node pointer. it may want to merge with more text nodes.
}
updateStartEnd(newStart, newEnd);
}
}