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/*
* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
* Copyright (C) 2011 Igalia S.L.
* Copyright (C) 2011 Motorola Mobility. 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 "markup.h"
#include "ArchiveResource.h"
#include "CSSPrimitiveValue.h"
#include "CSSPropertyNames.h"
#include "CSSValue.h"
#include "CSSValueKeywords.h"
#include "CacheStorageProvider.h"
#include "ChildListMutationScope.h"
#include "Comment.h"
#include "ComposedTreeIterator.h"
#include "CustomHeaderFields.h"
#include "DocumentFragment.h"
#include "DocumentLoader.h"
#include "DocumentType.h"
#include "Editing.h"
#include "Editor.h"
#include "EditorClient.h"
#include "ElementIterator.h"
#include "EmptyClients.h"
#include "File.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "HTMLAttachmentElement.h"
#include "HTMLBRElement.h"
#include "HTMLBodyElement.h"
#include "HTMLDivElement.h"
#include "HTMLHeadElement.h"
#include "HTMLHtmlElement.h"
#include "HTMLImageElement.h"
#include "HTMLNames.h"
#include "HTMLStyleElement.h"
#include "HTMLTableElement.h"
#include "HTMLTextAreaElement.h"
#include "HTMLTextFormControlElement.h"
#include "LibWebRTCProvider.h"
#include "MarkupAccumulator.h"
#include "NodeList.h"
#include "Page.h"
#include "PageConfiguration.h"
#include "PasteboardItemInfo.h"
#include "Range.h"
#include "RenderBlock.h"
#include "RuntimeEnabledFeatures.h"
#include "Settings.h"
#include "SocketProvider.h"
#include "StyleProperties.h"
#include "TextIterator.h"
#include "TypedElementDescendantIterator.h"
#include "VisibleSelection.h"
#include "VisibleUnits.h"
#include <wtf/StdLibExtras.h>
#include <wtf/URL.h>
#include <wtf/URLParser.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
using namespace HTMLNames;
static bool propertyMissingOrEqualToNone(StyleProperties*, CSSPropertyID);
class AttributeChange {
public:
AttributeChange()
: m_name(nullAtom(), nullAtom(), nullAtom())
{
}
AttributeChange(Element* element, const QualifiedName& name, const String& value)
: m_element(element), m_name(name), m_value(value)
{
}
void apply()
{
m_element->setAttribute(m_name, m_value);
}
private:
RefPtr<Element> m_element;
QualifiedName m_name;
String m_value;
};
static void completeURLs(DocumentFragment* fragment, const String& baseURL)
{
Vector<AttributeChange> changes;
URL parsedBaseURL({ }, baseURL);
for (auto& element : descendantsOfType<Element>(*fragment)) {
if (!element.hasAttributes())
continue;
for (const Attribute& attribute : element.attributesIterator()) {
if (element.attributeContainsURL(attribute) && !attribute.value().isEmpty())
changes.append(AttributeChange(&element, attribute.name(), element.completeURLsInAttributeValue(parsedBaseURL, attribute)));
}
}
for (auto& change : changes)
change.apply();
}
void replaceSubresourceURLs(Ref<DocumentFragment>&& fragment, HashMap<AtomString, AtomString>&& replacementMap)
{
Vector<AttributeChange> changes;
for (auto& element : descendantsOfType<Element>(fragment)) {
if (!element.hasAttributes())
continue;
for (const Attribute& attribute : element.attributesIterator()) {
// FIXME: This won't work for srcset.
if (element.attributeContainsURL(attribute) && !attribute.value().isEmpty()) {
auto replacement = replacementMap.get(attribute.value());
if (!replacement.isNull())
changes.append({ &element, attribute.name(), replacement });
}
}
}
for (auto& change : changes)
change.apply();
}
struct ElementAttribute {
Ref<Element> element;
QualifiedName attributeName;
};
void removeSubresourceURLAttributes(Ref<DocumentFragment>&& fragment, WTF::Function<bool(const URL&)> shouldRemoveURL)
{
Vector<ElementAttribute> attributesToRemove;
for (auto& element : descendantsOfType<Element>(fragment)) {
if (!element.hasAttributes())
continue;
for (const Attribute& attribute : element.attributesIterator()) {
// FIXME: This won't work for srcset.
if (element.attributeContainsURL(attribute) && !attribute.value().isEmpty()) {
URL url({ }, attribute.value());
if (shouldRemoveURL(url))
attributesToRemove.append({ element, attribute.name() });
}
}
}
for (auto& item : attributesToRemove)
item.element->removeAttribute(item.attributeName);
}
std::unique_ptr<Page> createPageForSanitizingWebContent()
{
auto pageConfiguration = pageConfigurationWithEmptyClients(PAL::SessionID::defaultSessionID());
auto page = makeUnique<Page>(WTFMove(pageConfiguration));
page->settings().setMediaEnabled(false);
page->settings().setScriptEnabled(false);
page->settings().setParserScriptingFlagPolicy(SettingsBase::ParserScriptingFlagPolicy::Enabled);
page->settings().setPluginsEnabled(false);
page->settings().setAcceleratedCompositingEnabled(false);
Frame& frame = page->mainFrame();
frame.setView(FrameView::create(frame, IntSize { 800, 600 }));
frame.init();
FrameLoader& loader = frame.loader();
static char markup[] = "<!DOCTYPE html><html><body></body></html>";
ASSERT(loader.activeDocumentLoader());
auto& writer = loader.activeDocumentLoader()->writer();
writer.setMIMEType("text/html");
writer.begin();
writer.insertDataSynchronously(String(markup));
writer.end();
RELEASE_ASSERT(page->mainFrame().document()->body());
return page;
}
String sanitizeMarkup(const String& rawHTML, MSOListQuirks msoListQuirks, Optional<WTF::Function<void(DocumentFragment&)>> fragmentSanitizer)
{
auto page = createPageForSanitizingWebContent();
Document* stagingDocument = page->mainFrame().document();
ASSERT(stagingDocument);
auto fragment = createFragmentFromMarkup(*stagingDocument, rawHTML, emptyString(), DisallowScriptingAndPluginContent);
if (fragmentSanitizer)
(*fragmentSanitizer)(fragment);
return sanitizedMarkupForFragmentInDocument(WTFMove(fragment), *stagingDocument, msoListQuirks, rawHTML);
}
enum class MSOListMode { Preserve, DoNotPreserve };
class StyledMarkupAccumulator final : public MarkupAccumulator {
public:
enum RangeFullySelectsNode { DoesFullySelectNode, DoesNotFullySelectNode };
StyledMarkupAccumulator(const Position& start, const Position& end, Vector<Node*>* nodes, ResolveURLs, SerializeComposedTree,
AnnotateForInterchange, StandardFontFamilySerializationMode, MSOListMode, bool needsPositionStyleConversion, Node* highestNodeToBeSerialized = nullptr);
Node* serializeNodes(const Position& start, const Position& end);
void wrapWithNode(Node&, bool convertBlocksToInlines = false, RangeFullySelectsNode = DoesFullySelectNode);
void wrapWithStyleNode(StyleProperties*, Document&, bool isBlock = false);
String takeResults();
bool needRelativeStyleWrapper() const { return m_needRelativeStyleWrapper; }
bool needClearingDiv() const { return m_needClearingDiv; }
using MarkupAccumulator::appendString;
ContainerNode* parentNode(Node& node)
{
if (UNLIKELY(m_useComposedTree))
return node.parentInComposedTree();
return node.parentOrShadowHostNode();
}
private:
void appendStyleNodeOpenTag(StringBuilder&, StyleProperties*, Document&, bool isBlock = false);
const String& styleNodeCloseTag(bool isBlock = false);
String renderedTextRespectingRange(const Text&);
String textContentRespectingRange(const Text&);
bool shouldPreserveMSOListStyleForElement(const Element&);
void appendStartTag(StringBuilder& out, const Element&, bool addDisplayInline, RangeFullySelectsNode);
void appendEndTag(StringBuilder& out, const Element&) override;
void appendCustomAttributes(StringBuilder&, const Element&, Namespaces*) override;
void appendText(StringBuilder& out, const Text&) override;
void appendStartTag(StringBuilder& out, const Element& element, Namespaces*) override
{
appendStartTag(out, element, false, DoesFullySelectNode);
}
Node* firstChild(Node& node)
{
if (UNLIKELY(m_useComposedTree))
return firstChildInComposedTreeIgnoringUserAgentShadow(node);
return node.firstChild();
}
Node* nextSibling(Node& node)
{
if (UNLIKELY(m_useComposedTree))
return nextSiblingInComposedTreeIgnoringUserAgentShadow(node);
return node.nextSibling();
}
Node* nextSkippingChildren(Node& node)
{
if (UNLIKELY(m_useComposedTree))
return nextSkippingChildrenInComposedTreeIgnoringUserAgentShadow(node);
return NodeTraversal::nextSkippingChildren(node);
}
bool hasChildNodes(Node& node)
{
if (UNLIKELY(m_useComposedTree))
return firstChildInComposedTreeIgnoringUserAgentShadow(node);
return node.hasChildNodes();
}
bool isDescendantOf(Node& node, Node& possibleAncestor)
{
if (UNLIKELY(m_useComposedTree))
return node.isDescendantOrShadowDescendantOf(&possibleAncestor);
return node.isDescendantOf(&possibleAncestor);
}
enum class NodeTraversalMode { EmitString, DoNotEmitString };
Node* traverseNodesForSerialization(Node* startNode, Node* pastEnd, NodeTraversalMode);
bool appendNodeToPreserveMSOList(Node&);
bool shouldAnnotate()
{
return m_annotate == AnnotateForInterchange::Yes;
}
bool shouldApplyWrappingStyle(const Node& node) const
{
return m_highestNodeToBeSerialized && m_highestNodeToBeSerialized->parentNode() == node.parentNode() && m_wrappingStyle && m_wrappingStyle->style();
}
Position m_start;
Position m_end;
Vector<String> m_reversedPrecedingMarkup;
const AnnotateForInterchange m_annotate;
RefPtr<Node> m_highestNodeToBeSerialized;
RefPtr<EditingStyle> m_wrappingStyle;
bool m_useComposedTree;
bool m_needsPositionStyleConversion;
StandardFontFamilySerializationMode m_standardFontFamilySerializationMode;
bool m_shouldPreserveMSOList;
bool m_needRelativeStyleWrapper { false };
bool m_needClearingDiv { false };
bool m_inMSOList { false };
};
inline StyledMarkupAccumulator::StyledMarkupAccumulator(const Position& start, const Position& end, Vector<Node*>* nodes, ResolveURLs urlsToResolve, SerializeComposedTree serializeComposedTree,
AnnotateForInterchange annotate, StandardFontFamilySerializationMode standardFontFamilySerializationMode, MSOListMode msoListMode, bool needsPositionStyleConversion, Node* highestNodeToBeSerialized)
: MarkupAccumulator(nodes, urlsToResolve)
, m_start(start)
, m_end(end)
, m_annotate(annotate)
, m_highestNodeToBeSerialized(highestNodeToBeSerialized)
, m_useComposedTree(serializeComposedTree == SerializeComposedTree::Yes)
, m_needsPositionStyleConversion(needsPositionStyleConversion)
, m_standardFontFamilySerializationMode(standardFontFamilySerializationMode)
, m_shouldPreserveMSOList(msoListMode == MSOListMode::Preserve)
{
}
void StyledMarkupAccumulator::wrapWithNode(Node& node, bool convertBlocksToInlines, RangeFullySelectsNode rangeFullySelectsNode)
{
StringBuilder markup;
if (is<Element>(node))
appendStartTag(markup, downcast<Element>(node), convertBlocksToInlines && isBlock(&node), rangeFullySelectsNode);
else
appendNonElementNode(markup, node, nullptr);
m_reversedPrecedingMarkup.append(markup.toString());
endAppendingNode(node);
if (m_nodes)
m_nodes->append(&node);
}
void StyledMarkupAccumulator::wrapWithStyleNode(StyleProperties* style, Document& document, bool isBlock)
{
StringBuilder openTag;
appendStyleNodeOpenTag(openTag, style, document, isBlock);
m_reversedPrecedingMarkup.append(openTag.toString());
appendString(styleNodeCloseTag(isBlock));
}
void StyledMarkupAccumulator::appendStyleNodeOpenTag(StringBuilder& out, StyleProperties* style, Document& document, bool isBlock)
{
// wrappingStyleForSerialization should have removed -webkit-text-decorations-in-effect
ASSERT(propertyMissingOrEqualToNone(style, CSSPropertyWebkitTextDecorationsInEffect));
if (isBlock)
out.appendLiteral("<div style=\"");
else
out.appendLiteral("<span style=\"");
appendAttributeValue(out, style->asText(), document.isHTMLDocument());
out.appendLiteral("\">");
}
const String& StyledMarkupAccumulator::styleNodeCloseTag(bool isBlock)
{
static NeverDestroyed<const String> divClose(MAKE_STATIC_STRING_IMPL("</div>"));
static NeverDestroyed<const String> styleSpanClose(MAKE_STATIC_STRING_IMPL("</span>"));
return isBlock ? divClose : styleSpanClose;
}
String StyledMarkupAccumulator::takeResults()
{
StringBuilder result;
result.reserveCapacity(totalLength(m_reversedPrecedingMarkup) + length());
for (size_t i = m_reversedPrecedingMarkup.size(); i > 0; --i)
result.append(m_reversedPrecedingMarkup[i - 1]);
concatenateMarkup(result);
// We remove '\0' characters because they are not visibly rendered to the user.
return result.toString().replaceWithLiteral('\0', "");
}
void StyledMarkupAccumulator::appendText(StringBuilder& out, const Text& text)
{
const bool parentIsTextarea = is<HTMLTextAreaElement>(text.parentElement());
const bool wrappingSpan = shouldApplyWrappingStyle(text) && !parentIsTextarea;
if (wrappingSpan) {
RefPtr<EditingStyle> wrappingStyle = m_wrappingStyle->copy();
// FIXME: <rdar://problem/5371536> Style rules that match pasted content can change it's appearance
// Make sure spans are inline style in paste side e.g. span { display: block }.
wrappingStyle->forceInline();
// FIXME: Should this be included in forceInline?
wrappingStyle->style()->setProperty(CSSPropertyFloat, CSSValueNone);
appendStyleNodeOpenTag(out, wrappingStyle->style(), text.document());
}
if (!shouldAnnotate() || parentIsTextarea) {
auto content = textContentRespectingRange(text);
appendCharactersReplacingEntities(out, content, 0, content.length(), entityMaskForText(text));
} else {
const bool useRenderedText = !enclosingElementWithTag(firstPositionInNode(const_cast<Text*>(&text)), selectTag);
String content = useRenderedText ? renderedTextRespectingRange(text) : textContentRespectingRange(text);
StringBuilder buffer;
appendCharactersReplacingEntities(buffer, content, 0, content.length(), EntityMaskInPCDATA);
out.append(convertHTMLTextToInterchangeFormat(buffer.toString(), &text));
}
if (wrappingSpan)
out.append(styleNodeCloseTag());
}
String StyledMarkupAccumulator::renderedTextRespectingRange(const Text& text)
{
TextIteratorBehavior behavior = TextIteratorDefaultBehavior;
Position start = &text == m_start.containerNode() ? m_start : firstPositionInNode(const_cast<Text*>(&text));
Position end;
if (&text == m_end.containerNode())
end = m_end;
else {
end = lastPositionInNode(const_cast<Text*>(&text));
if (!m_end.isNull())
behavior = TextIteratorBehavesAsIfNodesFollowing;
}
return plainText(Range::create(text.document(), start, end).ptr(), behavior);
}
String StyledMarkupAccumulator::textContentRespectingRange(const Text& text)
{
if (m_start.isNull() && m_end.isNull())
return text.data();
unsigned start = 0;
unsigned end = std::numeric_limits<unsigned>::max();
if (&text == m_start.containerNode())
start = m_start.offsetInContainerNode();
if (&text == m_end.containerNode())
end = m_end.offsetInContainerNode();
ASSERT(start < end);
return text.data().substring(start, end - start);
}
void StyledMarkupAccumulator::appendCustomAttributes(StringBuilder& out, const Element& element, Namespaces* namespaces)
{
#if ENABLE(ATTACHMENT_ELEMENT)
if (!RuntimeEnabledFeatures::sharedFeatures().attachmentElementEnabled())
return;
if (is<HTMLAttachmentElement>(element)) {
auto& attachment = downcast<HTMLAttachmentElement>(element);
appendAttribute(out, element, { webkitattachmentidAttr, attachment.uniqueIdentifier() }, namespaces);
if (auto* file = attachment.file()) {
// These attributes are only intended for File deserialization, and are removed from the generated attachment
// element after we've deserialized and set its backing File, in restoreAttachmentElementsInFragment.
appendAttribute(out, element, { webkitattachmentpathAttr, file->path() }, namespaces);
appendAttribute(out, element, { webkitattachmentbloburlAttr, file->url().string() }, namespaces);
}
} else if (is<HTMLImageElement>(element)) {
if (auto attachment = downcast<HTMLImageElement>(element).attachmentElement())
appendAttribute(out, element, { webkitattachmentidAttr, attachment->uniqueIdentifier() }, namespaces);
}
#else
UNUSED_PARAM(out);
UNUSED_PARAM(element);
UNUSED_PARAM(namespaces);
#endif
}
bool StyledMarkupAccumulator::shouldPreserveMSOListStyleForElement(const Element& element)
{
if (m_inMSOList)
return true;
if (m_shouldPreserveMSOList) {
auto style = element.getAttribute(styleAttr);
return style.startsWith("mso-list:") || style.contains(";mso-list:") || style.contains("\nmso-list:");
}
return false;
}
void StyledMarkupAccumulator::appendStartTag(StringBuilder& out, const Element& element, bool addDisplayInline, RangeFullySelectsNode rangeFullySelectsNode)
{
const bool documentIsHTML = element.document().isHTMLDocument();
const bool isSlotElement = is<HTMLSlotElement>(element);
if (UNLIKELY(isSlotElement))
out.append("<span");
else
appendOpenTag(out, element, nullptr);
appendCustomAttributes(out, element, nullptr);
const bool shouldAnnotateOrForceInline = element.isHTMLElement() && (shouldAnnotate() || addDisplayInline);
bool shouldOverrideStyleAttr = (shouldAnnotateOrForceInline || shouldApplyWrappingStyle(element) || isSlotElement) && !shouldPreserveMSOListStyleForElement(element);
if (element.hasAttributes()) {
for (const Attribute& attribute : element.attributesIterator()) {
// We'll handle the style attribute separately, below.
if (attribute.name() == styleAttr && shouldOverrideStyleAttr)
continue;
if (element.isEventHandlerAttribute(attribute) || element.isJavaScriptURLAttribute(attribute))
continue;
appendAttribute(out, element, attribute, 0);
}
}
if (shouldOverrideStyleAttr) {
RefPtr<EditingStyle> newInlineStyle;
if (shouldApplyWrappingStyle(element)) {
newInlineStyle = m_wrappingStyle->copy();
newInlineStyle->removePropertiesInElementDefaultStyle(*const_cast<Element*>(&element));
newInlineStyle->removeStyleConflictingWithStyleOfNode(*const_cast<Element*>(&element));
} else
newInlineStyle = EditingStyle::create();
if (isSlotElement)
newInlineStyle->addDisplayContents();
if (is<StyledElement>(element) && downcast<StyledElement>(element).inlineStyle())
newInlineStyle->overrideWithStyle(*downcast<StyledElement>(element).inlineStyle());
if (shouldAnnotateOrForceInline) {
if (shouldAnnotate())
newInlineStyle->mergeStyleFromRulesForSerialization(downcast<HTMLElement>(*const_cast<Element*>(&element)), m_standardFontFamilySerializationMode);
if (addDisplayInline)
newInlineStyle->forceInline();
if (m_needsPositionStyleConversion) {
m_needRelativeStyleWrapper |= newInlineStyle->convertPositionStyle();
m_needClearingDiv |= newInlineStyle->isFloating();
}
// If the node is not fully selected by the range, then we don't want to keep styles that affect its relationship to the nodes around it
// only the ones that affect it and the nodes within it.
if (rangeFullySelectsNode == DoesNotFullySelectNode && newInlineStyle->style())
newInlineStyle->style()->removeProperty(CSSPropertyFloat);
}
if (!newInlineStyle->isEmpty()) {
out.appendLiteral(" style=\"");
appendAttributeValue(out, newInlineStyle->style()->asText(), documentIsHTML);
out.append('\"');
}
}
appendCloseTag(out, element);
}
void StyledMarkupAccumulator::appendEndTag(StringBuilder& out, const Element& element)
{
if (UNLIKELY(is<HTMLSlotElement>(element)))
out.append("</span>");
else
MarkupAccumulator::appendEndTag(out, element);
}
Node* StyledMarkupAccumulator::serializeNodes(const Position& start, const Position& end)
{
ASSERT(comparePositions(start, end) <= 0);
auto startNode = start.firstNode();
Node* pastEnd = end.computeNodeAfterPosition();
if (!pastEnd && end.containerNode())
pastEnd = nextSkippingChildren(*end.containerNode());
if (!m_highestNodeToBeSerialized) {
Node* lastClosed = traverseNodesForSerialization(startNode.get(), pastEnd, NodeTraversalMode::DoNotEmitString);
m_highestNodeToBeSerialized = lastClosed;
}
if (m_highestNodeToBeSerialized && m_highestNodeToBeSerialized->parentNode())
m_wrappingStyle = EditingStyle::wrappingStyleForSerialization(*m_highestNodeToBeSerialized->parentNode(), shouldAnnotate(), m_standardFontFamilySerializationMode);
return traverseNodesForSerialization(startNode.get(), pastEnd, NodeTraversalMode::EmitString);
}
Node* StyledMarkupAccumulator::traverseNodesForSerialization(Node* startNode, Node* pastEnd, NodeTraversalMode traversalMode)
{
const bool shouldEmit = traversalMode == NodeTraversalMode::EmitString;
m_inMSOList = false;
unsigned depth = 0;
auto enterNode = [&] (Node& node) {
if (UNLIKELY(m_shouldPreserveMSOList) && shouldEmit) {
if (appendNodeToPreserveMSOList(node))
return false;
}
bool isDisplayContents = is<Element>(node) && downcast<Element>(node).hasDisplayContents();
if (!node.renderer() && !isDisplayContents && !enclosingElementWithTag(firstPositionInOrBeforeNode(&node), selectTag))
return false;
++depth;
if (shouldEmit)
startAppendingNode(node);
return true;
};
Node* lastClosed = nullptr;
auto exitNode = [&] (Node& node) {
bool closing = depth;
if (depth)
--depth;
if (shouldEmit) {
if (closing)
endAppendingNode(node);
else
wrapWithNode(node);
}
lastClosed = &node;
};
Node* lastNode = nullptr;
Node* next = nullptr;
for (auto* n = startNode; n != pastEnd; lastNode = n, n = next) {
Vector<Node*, 8> exitedAncestors;
next = nullptr;
if (auto* child = firstChild(*n))
next = child;
else if (auto* sibling = nextSibling(*n))
next = sibling;
else {
for (auto* ancestor = parentNode(*n); ancestor; ancestor = parentNode(*ancestor)) {
exitedAncestors.append(ancestor);
if (auto* sibling = nextSibling(*ancestor)) {
next = sibling;
break;
}
}
}
ASSERT(next || !pastEnd);
if (isBlock(n) && canHaveChildrenForEditing(*n) && next == pastEnd) {
// Don't write out empty block containers that aren't fully selected.
continue;
}
if (!enterNode(*n)) {
next = nextSkippingChildren(*n);
// Don't skip over pastEnd.
if (pastEnd && isDescendantOf(*pastEnd, *n))
next = pastEnd;
ASSERT(next || !pastEnd);
} else {
if (!hasChildNodes(*n))
exitNode(*n);
}
for (auto* ancestor : exitedAncestors) {
if (!depth && next == pastEnd)
break;
exitNode(*ancestor);
}
}
ASSERT(lastNode || !depth);
if (depth) {
for (auto* ancestor = parentNode(pastEnd ? *pastEnd : *lastNode); ancestor && depth; ancestor = parentNode(*ancestor))
exitNode(*ancestor);
}
return lastClosed;
}
bool StyledMarkupAccumulator::appendNodeToPreserveMSOList(Node& node)
{
if (is<Comment>(node)) {
auto& commentNode = downcast<Comment>(node);
if (!m_inMSOList && commentNode.data() == "[if !supportLists]")
m_inMSOList = true;
else if (m_inMSOList && commentNode.data() == "[endif]")
m_inMSOList = false;
else
return false;
startAppendingNode(commentNode);
return true;
}
if (is<HTMLStyleElement>(node)) {
auto* firstChild = node.firstChild();
if (!is<Text>(firstChild))
return false;
auto& textChild = downcast<Text>(*firstChild);
auto& styleContent = textChild.data();
const auto msoStyleDefinitionsStart = styleContent.find("/* Style Definitions */");
const auto msoListDefinitionsStart = styleContent.find("/* List Definitions */");
const auto lastListItem = styleContent.reverseFind("\n@list");
if (msoListDefinitionsStart == notFound || lastListItem == notFound)
return false;
const auto start = msoStyleDefinitionsStart != notFound && msoStyleDefinitionsStart < msoListDefinitionsStart ? msoStyleDefinitionsStart : msoListDefinitionsStart;
const auto msoListDefinitionsEnd = styleContent.find(";}\n", lastListItem);
if (msoListDefinitionsEnd == notFound || start >= msoListDefinitionsEnd)
return false;
appendString("<head><style class=\"" WebKitMSOListQuirksStyle "\">\n<!--\n");
appendStringView(StringView(textChild.data()).substring(start, msoListDefinitionsEnd - start + 3));
appendString("\n-->\n</style></head>");
return true;
}
return false;
}
static Node* ancestorToRetainStructureAndAppearanceForBlock(Node* commonAncestorBlock)
{
if (!commonAncestorBlock)
return nullptr;
if (commonAncestorBlock->hasTagName(tbodyTag) || commonAncestorBlock->hasTagName(trTag)) {
ContainerNode* table = commonAncestorBlock->parentNode();
while (table && !is<HTMLTableElement>(*table))
table = table->parentNode();
return table;
}
if (isNonTableCellHTMLBlockElement(commonAncestorBlock))
return commonAncestorBlock;
return nullptr;
}
static inline Node* ancestorToRetainStructureAndAppearance(Node* commonAncestor)
{
return ancestorToRetainStructureAndAppearanceForBlock(enclosingBlock(commonAncestor));
}
static bool propertyMissingOrEqualToNone(StyleProperties* style, CSSPropertyID propertyID)
{
if (!style)
return false;
RefPtr<CSSValue> value = style->getPropertyCSSValue(propertyID);
if (!value)
return true;
if (!is<CSSPrimitiveValue>(*value))
return false;
return downcast<CSSPrimitiveValue>(*value).valueID() == CSSValueNone;
}
static bool needInterchangeNewlineAfter(const VisiblePosition& v)
{
VisiblePosition next = v.next();
Node* upstreamNode = next.deepEquivalent().upstream().deprecatedNode();
Node* downstreamNode = v.deepEquivalent().downstream().deprecatedNode();
// Add an interchange newline if a paragraph break is selected and a br won't already be added to the markup to represent it.
return isEndOfParagraph(v) && isStartOfParagraph(next) && !(upstreamNode->hasTagName(brTag) && upstreamNode == downstreamNode);
}
static RefPtr<EditingStyle> styleFromMatchedRulesAndInlineDecl(Node& node)
{
if (!is<HTMLElement>(node))
return nullptr;
auto& element = downcast<HTMLElement>(node);
auto style = EditingStyle::create(element.inlineStyle());
style->mergeStyleFromRules(element);
return style;
}
static bool isElementPresentational(const Node* node)
{
return node->hasTagName(uTag) || node->hasTagName(sTag) || node->hasTagName(strikeTag)
|| node->hasTagName(iTag) || node->hasTagName(emTag) || node->hasTagName(bTag) || node->hasTagName(strongTag);
}
static Node* highestAncestorToWrapMarkup(const Position& start, const Position& end, Node& commonAncestor, AnnotateForInterchange annotate)
{
Node* specialCommonAncestor = nullptr;
if (annotate == AnnotateForInterchange::Yes) {
// Include ancestors that aren't completely inside the range but are required to retain
// the structure and appearance of the copied markup.
specialCommonAncestor = ancestorToRetainStructureAndAppearance(&commonAncestor);
if (auto* parentListNode = enclosingNodeOfType(start, isListItem)) {
if (!editingIgnoresContent(*parentListNode) && VisibleSelection::selectionFromContentsOfNode(parentListNode) == VisibleSelection(start, end)) {
specialCommonAncestor = parentListNode->parentNode();
while (specialCommonAncestor && !isListHTMLElement(specialCommonAncestor))
specialCommonAncestor = specialCommonAncestor->parentNode();
}
}
// Retain the Mail quote level by including all ancestor mail block quotes.
if (Node* highestMailBlockquote = highestEnclosingNodeOfType(start, isMailBlockquote, CanCrossEditingBoundary))
specialCommonAncestor = highestMailBlockquote;
}
auto* checkAncestor = specialCommonAncestor ? specialCommonAncestor : &commonAncestor;
if (checkAncestor->renderer() && checkAncestor->renderer()->containingBlock()) {
Node* newSpecialCommonAncestor = highestEnclosingNodeOfType(firstPositionInNode(checkAncestor), &isElementPresentational, CanCrossEditingBoundary, checkAncestor->renderer()->containingBlock()->element());
if (newSpecialCommonAncestor)
specialCommonAncestor = newSpecialCommonAncestor;
}
// If a single tab is selected, commonAncestor will be a text node inside a tab span.
// If two or more tabs are selected, commonAncestor will be the tab span.
// In either case, if there is a specialCommonAncestor already, it will necessarily be above
// any tab span that needs to be included.
if (!specialCommonAncestor && isTabSpanTextNode(&commonAncestor))
specialCommonAncestor = commonAncestor.parentNode();
if (!specialCommonAncestor && isTabSpanNode(&commonAncestor))
specialCommonAncestor = &commonAncestor;
if (auto* enclosingAnchor = enclosingElementWithTag(firstPositionInNode(specialCommonAncestor ? specialCommonAncestor : &commonAncestor), aTag))
specialCommonAncestor = enclosingAnchor;
return specialCommonAncestor;
}
static String serializePreservingVisualAppearanceInternal(const Position& start, const Position& end, Vector<Node*>* nodes, ResolveURLs urlsToResolve, SerializeComposedTree serializeComposedTree,
AnnotateForInterchange annotate, ConvertBlocksToInlines convertBlocksToInlines, StandardFontFamilySerializationMode standardFontFamilySerializationMode, MSOListMode msoListMode)
{
static NeverDestroyed<const String> interchangeNewlineString(MAKE_STATIC_STRING_IMPL("<br class=\"" AppleInterchangeNewline "\">"));
if (!comparePositions(start, end))
return emptyString();
RefPtr<Node> commonAncestor = commonShadowIncludingAncestor(start, end);
if (!commonAncestor)
return emptyString();
auto& document = *start.document();
document.updateLayoutIgnorePendingStylesheets();
VisiblePosition visibleStart { start };
VisiblePosition visibleEnd { end };
auto body = makeRefPtr(enclosingElementWithTag(firstPositionInNode(commonAncestor.get()), bodyTag));
RefPtr<Element> fullySelectedRoot;
// FIXME: Do this for all fully selected blocks, not just the body.
if (body && VisiblePosition(firstPositionInNode(body.get())) == visibleStart && VisiblePosition(lastPositionInNode(body.get())) == visibleEnd)
fullySelectedRoot = body;
bool needsPositionStyleConversion = body && fullySelectedRoot == body && document.settings().shouldConvertPositionStyleOnCopy();
Node* specialCommonAncestor = highestAncestorToWrapMarkup(start, end, *commonAncestor, annotate);
StyledMarkupAccumulator accumulator(start, end, nodes, urlsToResolve, serializeComposedTree, annotate, standardFontFamilySerializationMode, msoListMode, needsPositionStyleConversion, specialCommonAncestor);
Position startAdjustedForInterchangeNewline = start;
if (annotate == AnnotateForInterchange::Yes && needInterchangeNewlineAfter(visibleStart)) {
if (visibleStart == visibleEnd.previous())
return interchangeNewlineString;
accumulator.appendString(interchangeNewlineString);
startAdjustedForInterchangeNewline = visibleStart.next().deepEquivalent();
if (comparePositions(startAdjustedForInterchangeNewline, end) >= 0)
return interchangeNewlineString;
}
Node* lastClosed = accumulator.serializeNodes(startAdjustedForInterchangeNewline, end);
if (specialCommonAncestor && lastClosed) {
// Also include all of the ancestors of lastClosed up to this special ancestor.
for (ContainerNode* ancestor = accumulator.parentNode(*lastClosed); ancestor; ancestor = accumulator.parentNode(*ancestor)) {
if (ancestor == fullySelectedRoot && convertBlocksToInlines == ConvertBlocksToInlines::No) {
RefPtr<EditingStyle> fullySelectedRootStyle = styleFromMatchedRulesAndInlineDecl(*fullySelectedRoot);
// Bring the background attribute over, but not as an attribute because a background attribute on a div
// appears to have no effect.
if ((!fullySelectedRootStyle || !fullySelectedRootStyle->style() || !fullySelectedRootStyle->style()->getPropertyCSSValue(CSSPropertyBackgroundImage))
&& fullySelectedRoot->hasAttributeWithoutSynchronization(backgroundAttr))
fullySelectedRootStyle->style()->setProperty(CSSPropertyBackgroundImage, "url('" + fullySelectedRoot->getAttribute(backgroundAttr) + "')");
if (fullySelectedRootStyle->style()) {
// Reset the CSS properties to avoid an assertion error in addStyleMarkup().
// This assertion is caused at least when we select all text of a <body> element whose
// 'text-decoration' property is "inherit", and copy it.
if (!propertyMissingOrEqualToNone(fullySelectedRootStyle->style(), CSSPropertyTextDecoration))
fullySelectedRootStyle->style()->setProperty(CSSPropertyTextDecoration, CSSValueNone);
if (!propertyMissingOrEqualToNone(fullySelectedRootStyle->style(), CSSPropertyWebkitTextDecorationsInEffect))
fullySelectedRootStyle->style()->setProperty(CSSPropertyWebkitTextDecorationsInEffect, CSSValueNone);
accumulator.wrapWithStyleNode(fullySelectedRootStyle->style(), document, true);
}
} else {
// Since this node and all the other ancestors are not in the selection we want to set RangeFullySelectsNode to DoesNotFullySelectNode
// so that styles that affect the exterior of the node are not included.
accumulator.wrapWithNode(*ancestor, convertBlocksToInlines == ConvertBlocksToInlines::Yes, StyledMarkupAccumulator::DoesNotFullySelectNode);
}
if (nodes)
nodes->append(ancestor);
if (ancestor == specialCommonAncestor)
break;
}
}
if (accumulator.needRelativeStyleWrapper() && needsPositionStyleConversion) {
if (accumulator.needClearingDiv())
accumulator.appendString("<div style=\"clear: both;\"></div>");
RefPtr<EditingStyle> positionRelativeStyle = styleFromMatchedRulesAndInlineDecl(*body);
positionRelativeStyle->style()->setProperty(CSSPropertyPosition, CSSValueRelative);
accumulator.wrapWithStyleNode(positionRelativeStyle->style(), document, true);
}
// FIXME: The interchange newline should be placed in the block that it's in, not after all of the content, unconditionally.
if (annotate == AnnotateForInterchange::Yes && needInterchangeNewlineAfter(visibleEnd.previous()))
accumulator.appendString(interchangeNewlineString);
return accumulator.takeResults();
}
String serializePreservingVisualAppearance(const Range& range, Vector<Node*>* nodes, AnnotateForInterchange annotate, ConvertBlocksToInlines convertBlocksToInlines, ResolveURLs urlsToReslve)
{
return serializePreservingVisualAppearanceInternal(range.startPosition(), range.endPosition(), nodes, urlsToReslve, SerializeComposedTree::No,
annotate, convertBlocksToInlines, StandardFontFamilySerializationMode::Keep, MSOListMode::DoNotPreserve);
}
String serializePreservingVisualAppearance(const VisibleSelection& selection, ResolveURLs resolveURLs, SerializeComposedTree serializeComposedTree, Vector<Node*>* nodes)
{
return serializePreservingVisualAppearanceInternal(selection.start(), selection.end(), nodes, resolveURLs, serializeComposedTree,
AnnotateForInterchange::Yes, ConvertBlocksToInlines::No, StandardFontFamilySerializationMode::Keep, MSOListMode::DoNotPreserve);
}
static bool shouldPreserveMSOLists(const String& markup)
{
if (!markup.startsWith("<html xmlns:"))
return false;
auto tagClose = markup.find('>');
if (tagClose == notFound)
return false;
auto htmlTag = markup.substring(0, tagClose);
return htmlTag.contains("xmlns:o=\"urn:schemas-microsoft-com:office:office\"")
&& htmlTag.contains("xmlns:w=\"urn:schemas-microsoft-com:office:word\"");
}
String sanitizedMarkupForFragmentInDocument(Ref<DocumentFragment>&& fragment, Document& document, MSOListQuirks msoListQuirks, const String& originalMarkup)
{
MSOListMode msoListMode = msoListQuirks == MSOListQuirks::CheckIfNeeded && shouldPreserveMSOLists(originalMarkup)
? MSOListMode::Preserve : MSOListMode::DoNotPreserve;
auto bodyElement = makeRefPtr(document.body());
ASSERT(bodyElement);
bodyElement->appendChild(fragment.get());
// SerializeComposedTree::No because there can't be a shadow tree in the pasted fragment.
auto result = serializePreservingVisualAppearanceInternal(firstPositionInNode(bodyElement.get()), lastPositionInNode(bodyElement.get()), nullptr,
ResolveURLs::YesExcludingLocalFileURLsForPrivacy, SerializeComposedTree::No, AnnotateForInterchange::Yes, ConvertBlocksToInlines::No, StandardFontFamilySerializationMode::Strip, msoListMode);
if (msoListMode == MSOListMode::Preserve) {
StringBuilder builder;
builder.appendLiteral("<html xmlns:o=\"urn:schemas-microsoft-com:office:office\"\n"
"xmlns:w=\"urn:schemas-microsoft-com:office:word\"\n"
"xmlns:m=\"http://schemas.microsoft.com/office/2004/12/omml\"\n"
"xmlns=\"http://www.w3.org/TR/REC-html40\">");
builder.append(result);
builder.appendLiteral("</html>");
return builder.toString();
}
return result;
}
static void restoreAttachmentElementsInFragment(DocumentFragment& fragment)
{
#if ENABLE(ATTACHMENT_ELEMENT)
if (!RuntimeEnabledFeatures::sharedFeatures().attachmentElementEnabled())
return;
// When creating a fragment we must strip the webkit-attachment-path attribute after restoring the File object.
Vector<Ref<HTMLAttachmentElement>> attachments;
for (auto& attachment : descendantsOfType<HTMLAttachmentElement>(fragment))
attachments.append(attachment);
for (auto& attachment : attachments) {
attachment->setUniqueIdentifier(attachment->attributeWithoutSynchronization(webkitattachmentidAttr));
auto attachmentPath = attachment->attachmentPath();
auto blobURL = attachment->blobURL();
if (!attachmentPath.isEmpty())
attachment->setFile(File::create(attachmentPath));
else if (!blobURL.isEmpty())
attachment->setFile(File::deserialize({ }, blobURL, attachment->attachmentType(), attachment->attachmentTitle()));
// Remove temporary attributes that were previously added in StyledMarkupAccumulator::appendCustomAttributes.
attachment->removeAttribute(webkitattachmentidAttr);
attachment->removeAttribute(webkitattachmentpathAttr);
attachment->removeAttribute(webkitattachmentbloburlAttr);
}
Vector<Ref<HTMLImageElement>> images;
for (auto& image : descendantsOfType<HTMLImageElement>(fragment))
images.append(image);
for (auto& image : images) {
auto attachmentIdentifier = image->attributeWithoutSynchronization(webkitattachmentidAttr);
if (attachmentIdentifier.isEmpty())
continue;
auto attachment = HTMLAttachmentElement::create(HTMLNames::attachmentTag, *fragment.ownerDocument());
attachment->setUniqueIdentifier(attachmentIdentifier);
image->setAttachmentElement(WTFMove(attachment));
image->removeAttribute(webkitattachmentidAttr);
}
#else
UNUSED_PARAM(fragment);
#endif
}
Ref<DocumentFragment> createFragmentFromMarkup(Document& document, const String& markup, const String& baseURL, ParserContentPolicy parserContentPolicy)
{
// We use a fake body element here to trick the HTML parser into using the InBody insertion mode.
auto fakeBody = HTMLBodyElement::create(document);
auto fragment = DocumentFragment::create(document);
fragment->parseHTML(markup, fakeBody.ptr(), parserContentPolicy);
restoreAttachmentElementsInFragment(fragment);
if (!baseURL.isEmpty() && baseURL != WTF::blankURL() && baseURL != document.baseURL())
completeURLs(fragment.ptr(), baseURL);
return fragment;
}
String serializeFragment(const Node& node, SerializedNodes root, Vector<Node*>* nodes, ResolveURLs urlsToResolve, Vector<QualifiedName>* tagNamesToSkip, SerializationSyntax serializationSyntax)
{
MarkupAccumulator accumulator(nodes, urlsToResolve, serializationSyntax);
return accumulator.serializeNodes(const_cast<Node&>(node), root, tagNamesToSkip);
}
static void fillContainerFromString(ContainerNode& paragraph, const String& string)
{
Document& document = paragraph.document();
if (string.isEmpty()) {
paragraph.appendChild(createBlockPlaceholderElement(document));
return;
}
ASSERT(string.find('\n') == notFound);
Vector<String> tabList = string.splitAllowingEmptyEntries('\t');
String tabText = emptyString();
bool first = true;
size_t numEntries = tabList.size();
for (size_t i = 0; i < numEntries; ++i) {
const String& s = tabList[i];
// append the non-tab textual part
if (!s.isEmpty()) {
if (!tabText.isEmpty()) {
paragraph.appendChild(createTabSpanElement(document, tabText));
tabText = emptyString();
}
Ref<Node> textNode = document.createTextNode(stringWithRebalancedWhitespace(s, first, i + 1 == numEntries));
paragraph.appendChild(textNode);
}
// there is a tab after every entry, except the last entry
// (if the last character is a tab, the list gets an extra empty entry)
if (i + 1 != numEntries)
tabText.append('\t');
else if (!tabText.isEmpty())
paragraph.appendChild(createTabSpanElement(document, tabText));
first = false;
}
}
bool isPlainTextMarkup(Node* node)
{
ASSERT(node);
if (!is<HTMLDivElement>(*node))
return false;
HTMLDivElement& element = downcast<HTMLDivElement>(*node);
if (element.hasAttributes())
return false;
Node* firstChild = element.firstChild();
if (!firstChild)
return false;
Node* secondChild = firstChild->nextSibling();
if (!secondChild)
return firstChild->isTextNode() || firstChild->firstChild();
if (secondChild->nextSibling())
return false;
return isTabSpanTextNode(firstChild->firstChild()) && secondChild->isTextNode();
}
static bool contextPreservesNewline(const Range& context)
{
VisiblePosition position(context.startPosition());
Node* container = position.deepEquivalent().containerNode();
if (!container || !container->renderer())
return false;
return container->renderer()->style().preserveNewline();
}
Ref<DocumentFragment> createFragmentFromText(Range& context, const String& text)
{
Document& document = context.ownerDocument();
Ref<DocumentFragment> fragment = document.createDocumentFragment();
if (text.isEmpty())
return fragment;
String string = text;
string.replace("\r\n", "\n");
string.replace('\r', '\n');
auto createHTMLBRElement = [&document]() {
auto element = HTMLBRElement::create(document);
element->setAttributeWithoutSynchronization(classAttr, AppleInterchangeNewline);
return element;
};
if (contextPreservesNewline(context)) {
fragment->appendChild(document.createTextNode(string));
if (string.endsWith('\n')) {
fragment->appendChild(createHTMLBRElement());
}
return fragment;
}
// A string with no newlines gets added inline, rather than being put into a paragraph.
if (string.find('\n') == notFound) {
fillContainerFromString(fragment, string);
return fragment;
}
if (string.length() == 1 && string[0] == '\n') {
// This is a single newline char, thus just create one HTMLBRElement.
fragment->appendChild(createHTMLBRElement());
return fragment;
}
// Break string into paragraphs. Extra line breaks turn into empty paragraphs.
Node* blockNode = enclosingBlock(context.firstNode());
Element* block = downcast<Element>(blockNode);
bool useClonesOfEnclosingBlock = blockNode
&& blockNode->isElementNode()
&& !block->hasTagName(bodyTag)
&& !block->hasTagName(htmlTag)
&& block != editableRootForPosition(context.startPosition());
bool useLineBreak = enclosingTextFormControl(context.startPosition());
Vector<String> list = string.splitAllowingEmptyEntries('\n');
size_t numLines = list.size();
for (size_t i = 0; i < numLines; ++i) {
const String& s = list[i];
RefPtr<Element> element;
if (s.isEmpty() && i + 1 == numLines) {
// For last line, use the "magic BR" rather than a P.
element = createHTMLBRElement();
} else if (useLineBreak) {
element = HTMLBRElement::create(document);
fillContainerFromString(fragment, s);
} else {
if (useClonesOfEnclosingBlock)
element = block->cloneElementWithoutChildren(document);
else
element = createDefaultParagraphElement(document);
fillContainerFromString(*element, s);
}
fragment->appendChild(*element);
}
return fragment;
}
String documentTypeString(const Document& document)
{
DocumentType* documentType = document.doctype();
if (!documentType)
return emptyString();
return serializeFragment(*documentType, SerializedNodes::SubtreeIncludingNode);
}
String urlToMarkup(const URL& url, const String& title)
{
StringBuilder markup;
markup.appendLiteral("<a href=\"");
markup.append(url.string());
markup.appendLiteral("\">");
MarkupAccumulator::appendCharactersReplacingEntities(markup, title, 0, title.length(), EntityMaskInPCDATA);
markup.appendLiteral("</a>");
return markup.toString();
}
ExceptionOr<Ref<DocumentFragment>> createFragmentForInnerOuterHTML(Element& contextElement, const String& markup, ParserContentPolicy parserContentPolicy)
{
auto* document = &contextElement.document();
if (contextElement.hasTagName(templateTag))
document = &document->ensureTemplateDocument();
auto fragment = DocumentFragment::create(*document);
if (document->isHTMLDocument()) {
fragment->parseHTML(markup, &contextElement, parserContentPolicy);
return fragment;
}
bool wasValid = fragment->parseXML(markup, &contextElement, parserContentPolicy);
if (!wasValid)
return Exception { SyntaxError };
return fragment;
}
RefPtr<DocumentFragment> createFragmentForTransformToFragment(Document& outputDoc, const String& sourceString, const String& sourceMIMEType)
{
RefPtr<DocumentFragment> fragment = outputDoc.createDocumentFragment();
if (sourceMIMEType == "text/html") {
// As far as I can tell, there isn't a spec for how transformToFragment is supposed to work.
// Based on the documentation I can find, it looks like we want to start parsing the fragment in the InBody insertion mode.
// Unfortunately, that's an implementation detail of the parser.
// We achieve that effect here by passing in a fake body element as context for the fragment.
auto fakeBody = HTMLBodyElement::create(outputDoc);
fragment->parseHTML(sourceString, fakeBody.ptr());
} else if (sourceMIMEType == "text/plain")
fragment->parserAppendChild(Text::create(outputDoc, sourceString));
else {
bool successfulParse = fragment->parseXML(sourceString, 0);
if (!successfulParse)
return nullptr;
}
// FIXME: Do we need to mess with URLs here?
return fragment;
}
Ref<DocumentFragment> createFragmentForImageAndURL(Document& document, const String& url, PresentationSize preferredSize)
{
auto imageElement = HTMLImageElement::create(document);
imageElement->setAttributeWithoutSynchronization(HTMLNames::srcAttr, url);
if (preferredSize.width)
imageElement->setAttributeWithoutSynchronization(HTMLNames::widthAttr, AtomString::number(*preferredSize.width));
if (preferredSize.height)
imageElement->setAttributeWithoutSynchronization(HTMLNames::heightAttr, AtomString::number(*preferredSize.height));
auto fragment = document.createDocumentFragment();
fragment->appendChild(imageElement);
return fragment;
}
static Vector<Ref<HTMLElement>> collectElementsToRemoveFromFragment(ContainerNode& container)
{
Vector<Ref<HTMLElement>> toRemove;
for (auto& element : childrenOfType<HTMLElement>(container)) {
if (is<HTMLHtmlElement>(element)) {
toRemove.append(element);
collectElementsToRemoveFromFragment(element);
continue;
}
if (is<HTMLHeadElement>(element) || is<HTMLBodyElement>(element))
toRemove.append(element);
}
return toRemove;
}
static void removeElementFromFragmentPreservingChildren(DocumentFragment& fragment, HTMLElement& element)
{
RefPtr<Node> nextChild;
for (RefPtr<Node> child = element.firstChild(); child; child = nextChild) {
nextChild = child->nextSibling();
element.removeChild(*child);
fragment.insertBefore(*child, &element);
}
fragment.removeChild(element);
}
ExceptionOr<Ref<DocumentFragment>> createContextualFragment(Element& element, const String& markup, ParserContentPolicy parserContentPolicy)
{
auto result = createFragmentForInnerOuterHTML(element, markup, parserContentPolicy);
if (result.hasException())
return result.releaseException();
auto fragment = result.releaseReturnValue();
// We need to pop <html> and <body> elements and remove <head> to
// accommodate folks passing complete HTML documents to make the
// child of an element.
auto toRemove = collectElementsToRemoveFromFragment(fragment);
for (auto& element : toRemove)
removeElementFromFragmentPreservingChildren(fragment, element);
return fragment;
}
static inline bool hasOneChild(ContainerNode& node)
{
Node* firstChild = node.firstChild();
return firstChild && !firstChild->nextSibling();
}
static inline bool hasOneTextChild(ContainerNode& node)
{
return hasOneChild(node) && node.firstChild()->isTextNode();
}
static inline bool hasMutationEventListeners(const Document& document)
{
return document.hasListenerType(Document::DOMSUBTREEMODIFIED_LISTENER)
|| document.hasListenerType(Document::DOMNODEINSERTED_LISTENER)
|| document.hasListenerType(Document::DOMNODEREMOVED_LISTENER)
|| document.hasListenerType(Document::DOMNODEREMOVEDFROMDOCUMENT_LISTENER)
|| document.hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER);
}
// We can use setData instead of replacing Text node as long as script can't observe the difference.
static inline bool canUseSetDataOptimization(const Text& containerChild, const ChildListMutationScope& mutationScope)
{
bool authorScriptMayHaveReference = containerChild.refCount();
return !authorScriptMayHaveReference && !mutationScope.canObserve() && !hasMutationEventListeners(containerChild.document());
}
ExceptionOr<void> replaceChildrenWithFragment(ContainerNode& container, Ref<DocumentFragment>&& fragment)
{
Ref<ContainerNode> containerNode(container);
ChildListMutationScope mutation(containerNode);
if (!fragment->firstChild()) {
containerNode->removeChildren();
return { };
}
auto* containerChild = containerNode->firstChild();
if (containerChild && !containerChild->nextSibling()) {
if (is<Text>(*containerChild) && hasOneTextChild(fragment) && canUseSetDataOptimization(downcast<Text>(*containerChild), mutation)) {
ASSERT(!fragment->firstChild()->refCount());
downcast<Text>(*containerChild).setData(downcast<Text>(*fragment->firstChild()).data());
return { };
}
return containerNode->replaceChild(fragment, *containerChild);
}
containerNode->removeChildren();
return containerNode->appendChild(fragment);
}
}