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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/xml/DocumentXSLT.h"
#include "bindings/core/v8/DOMWrapperWorld.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/V8AbstractEventListener.h"
#include "bindings/core/v8/V8Binding.h"
#include "core/dom/Document.h"
#include "core/dom/Node.h"
#include "core/dom/ProcessingInstruction.h"
#include "core/events/Event.h"
#include "core/events/EventListener.h"
#include "core/frame/UseCounter.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/xml/XSLStyleSheet.h"
#include "core/xml/XSLTProcessor.h"
namespace blink {
class DOMContentLoadedListener final
: public V8AbstractEventListener,
public ProcessingInstruction::DetachableEventListener {
USING_GARBAGE_COLLECTED_MIXIN(DOMContentLoadedListener);
public:
static DOMContentLoadedListener* create(ScriptState* scriptState,
ProcessingInstruction* pi) {
return new DOMContentLoadedListener(scriptState, pi);
}
bool operator==(const EventListener&) const override { return true; }
virtual void handleEvent(ScriptState* scriptState, Event* event) {
DCHECK(RuntimeEnabledFeatures::xsltEnabled());
DCHECK_EQ(event->type(), "DOMContentLoaded");
ScriptState::Scope scope(scriptState);
Document& document = *toDocument(scriptState->getExecutionContext());
DCHECK(!document.parsing());
// Processing instruction (XML documents only).
// We don't support linking to embedded CSS stylesheets,
// see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion.
// Don't apply XSL transforms to already transformed documents.
if (DocumentXSLT::hasTransformSourceDocument(document))
return;
ProcessingInstruction* pi = DocumentXSLT::findXSLStyleSheet(document);
if (!pi || pi != m_processingInstruction || pi->isLoading())
return;
DocumentXSLT::applyXSLTransform(document, pi);
}
void detach() override { m_processingInstruction = nullptr; }
EventListener* toEventListener() override { return this; }
DEFINE_INLINE_VIRTUAL_TRACE() {
visitor->trace(m_processingInstruction);
V8AbstractEventListener::trace(visitor);
ProcessingInstruction::DetachableEventListener::trace(visitor);
}
private:
DOMContentLoadedListener(ScriptState* scriptState, ProcessingInstruction* pi)
: V8AbstractEventListener(false,
scriptState->world(),
scriptState->isolate()),
m_processingInstruction(pi) {}
virtual v8::Local<v8::Value> callListenerFunction(ScriptState*,
v8::Local<v8::Value>,
Event*) {
NOTREACHED();
return v8::Local<v8::Value>();
}
// If this event listener is attached to a ProcessingInstruction, keep a
// weak reference back to it. That ProcessingInstruction is responsible for
// detaching itself and clear out the reference.
Member<ProcessingInstruction> m_processingInstruction;
};
DocumentXSLT::DocumentXSLT(Document& document)
: Supplement<Document>(document), m_transformSourceDocument(nullptr) {}
void DocumentXSLT::applyXSLTransform(Document& document,
ProcessingInstruction* pi) {
DCHECK(!pi->isLoading());
UseCounter::count(document, UseCounter::XSLProcessingInstruction);
XSLTProcessor* processor = XSLTProcessor::create(document);
processor->setXSLStyleSheet(toXSLStyleSheet(pi->sheet()));
String resultMIMEType;
String newSource;
String resultEncoding;
document.setParsingState(Document::Parsing);
if (!processor->transformToString(&document, resultMIMEType, newSource,
resultEncoding)) {
document.setParsingState(Document::FinishedParsing);
return;
}
// FIXME: If the transform failed we should probably report an error (like
// Mozilla does).
LocalFrame* ownerFrame = document.frame();
processor->createDocumentFromSource(newSource, resultEncoding, resultMIMEType,
&document, ownerFrame);
InspectorInstrumentation::frameDocumentUpdated(ownerFrame);
document.setParsingState(Document::FinishedParsing);
}
ProcessingInstruction* DocumentXSLT::findXSLStyleSheet(Document& document) {
for (Node* node = document.firstChild(); node; node = node->nextSibling()) {
if (node->getNodeType() != Node::kProcessingInstructionNode)
continue;
ProcessingInstruction* pi = toProcessingInstruction(node);
if (pi->isXSL())
return pi;
}
return nullptr;
}
bool DocumentXSLT::processingInstructionInsertedIntoDocument(
Document& document,
ProcessingInstruction* pi) {
if (!pi->isXSL())
return false;
if (!RuntimeEnabledFeatures::xsltEnabled() || !document.frame())
return true;
ScriptState* scriptState = ScriptState::forMainWorld(document.frame());
if (!scriptState)
return false;
DOMContentLoadedListener* listener =
DOMContentLoadedListener::create(scriptState, pi);
document.addEventListener(EventTypeNames::DOMContentLoaded, listener, false);
DCHECK(!pi->eventListenerForXSLT());
pi->setEventListenerForXSLT(listener);
return true;
}
bool DocumentXSLT::processingInstructionRemovedFromDocument(
Document& document,
ProcessingInstruction* pi) {
if (!pi->isXSL())
return false;
if (!pi->eventListenerForXSLT())
return true;
DCHECK(RuntimeEnabledFeatures::xsltEnabled());
document.removeEventListener(EventTypeNames::DOMContentLoaded,
pi->eventListenerForXSLT(), false);
pi->clearEventListenerForXSLT();
return true;
}
bool DocumentXSLT::sheetLoaded(Document& document, ProcessingInstruction* pi) {
if (!pi->isXSL())
return false;
if (RuntimeEnabledFeatures::xsltEnabled() && !document.parsing() &&
!pi->isLoading() && !DocumentXSLT::hasTransformSourceDocument(document)) {
if (findXSLStyleSheet(document) == pi)
applyXSLTransform(document, pi);
}
return true;
}
const char* DocumentXSLT::supplementName() {
return "DocumentXSLT";
}
bool DocumentXSLT::hasTransformSourceDocument(Document& document) {
return static_cast<DocumentXSLT*>(
Supplement<Document>::from(document, supplementName()));
}
DocumentXSLT& DocumentXSLT::from(Document& document) {
DocumentXSLT* supplement = static_cast<DocumentXSLT*>(
Supplement<Document>::from(document, supplementName()));
if (!supplement) {
supplement = new DocumentXSLT(document);
Supplement<Document>::provideTo(document, supplementName(), supplement);
}
return *supplement;
}
DEFINE_TRACE(DocumentXSLT) {
visitor->trace(m_transformSourceDocument);
Supplement<Document>::trace(visitor);
}
} // namespace blink
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