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// Copyright 2019 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 "third_party/blink/renderer/core/loader/frame_or_imported_document.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/html/imports/html_imports_controller.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/core/loader/frame_loader.h"
namespace blink {
LocalFrame& FrameOrImportedDocument::GetFrame() const {
if (document_loader_) {
LocalFrame* frame = document_loader_->GetFrame();
DCHECK(frame);
return *frame;
}
// HTML imports case
DCHECK(document_);
// It's guaranteed that imports_controller is not nullptr since:
// - only ClearImportsController() clears it
// - ClearImportsController() also calls ResourceFethcer::ClearContext().
HTMLImportsController* imports_controller = document_->ImportsController();
DCHECK(imports_controller);
// It's guaranteed that Master() is not yet Shutdown()-ed since when Master()
// is Shutdown()-ed:
// - Master()'s HTMLImportsController is disposed.
// - All the HTMLImportLoader instances of the HTMLImportsController are
// disposed.
// - ClearImportsController() is called on the Document.
// HTMLImportsController is created only when the master Document's
// GetFrame() doesn't return nullptr, this is guaranteed to be not nullptr
// here.
LocalFrame* frame = imports_controller->Master()->GetFrame();
DCHECK(frame);
return *frame;
}
DocumentLoader& FrameOrImportedDocument::GetMasterDocumentLoader() const {
if (document_loader_)
return *document_loader_;
// HTML imports case
// GetDocumentLoader() here always returns a non-nullptr value that is the
// DocumentLoader for |document_| because:
// - A Document is created with a LocalFrame only after the
// DocumentLoader is committed
// - When another DocumentLoader is committed, the FrameLoader
// Shutdown()-s |document_|.
auto* loader = GetFrame().Loader().GetDocumentLoader();
DCHECK(loader);
return *loader;
}
void FrameOrImportedDocument::UpdateDocument(Document& document) {
DCHECK(document_loader_);
document_ = document;
}
void FrameOrImportedDocument::Trace(Visitor* visitor) {
visitor->Trace(document_loader_);
visitor->Trace(document_);
}
} // namespace blink
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