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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_CONTENT_EXTRACTION_INNER_TEXT_BUILDER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_CONTENT_EXTRACTION_INNER_TEXT_BUILDER_H_
#include <optional>
#include "base/memory/stack_allocated.h"
#include "third_party/blink/public/common/tokens/tokens.h"
#include "third_party/blink/public/mojom/content_extraction/inner_text.mojom-blink.h"
#include "third_party/blink/renderer/core/dom/text_visitor.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_vector.h"
#include "third_party/blink/renderer/platform/heap/member.h"
namespace blink {
class HTMLElement;
class HTMLIFrameElement;
class LocalFrame;
// Builds mojom::blink::InnerTextFrame for a frame, and all suitable
// iframes. See the mojom for details on the format.
//
// An InnerTextBuilder is created per Frame. Internally it tracks all iframes
// and will build results for them as well.
class MODULES_EXPORT InnerTextBuilder final : public TextVisitor {
STACK_ALLOCATED();
public:
InnerTextBuilder(const InnerTextBuilder&) = delete;
InnerTextBuilder& operator=(const InnerTextBuilder&) = delete;
static mojom::blink::InnerTextFramePtr Build(
LocalFrame& frame,
const mojom::blink::InnerTextParams& params);
private:
// A ChildIFrame is created for every HTMLIFrame in a particular frame. These
// are created (and added to `child_iframes_`) as the inner-text is generated.
struct ChildIFrame : public GarbageCollected<ChildIFrame> {
void Trace(Visitor* visitor) const;
// The location of the child frame in the resulting inner-text of the
// parent frame.
unsigned offset;
Member<const HTMLIFrameElement> iframe;
};
InnerTextBuilder(const mojom::blink::InnerTextParams& params,
HeapVector<Member<ChildIFrame>>& child_iframes);
// Builds the results for a frame, and recurses through all child frames.
void Build(HTMLElement& body, mojom::blink::InnerTextFrame& frame);
// Adds text (or NodeLocation) to Segments `frame.segments`. `text_offset` is
// the current offset into `text` and `next_child_offset` the offset into
// `text` of the next child.
void AddNextNonFrameSegments(const String& text,
unsigned next_child_offset,
unsigned& text_offset,
mojom::blink::InnerTextFrame& frame);
// TextVisitor:
void WillVisit(const Node& element, unsigned offset) override;
const mojom::blink::InnerTextParams& params_;
// Set if `params` contained a `InnerTextDomNodeId` and the node was found.
std::optional<unsigned> matching_node_location_;
// Child iframes encountered.
HeapVector<Member<ChildIFrame>>& child_iframes_;
};
// An alternative implementation wrapping DocumentChunker passage extraction.
// This will be used only when one or more of the relevant optional parameters
// are specified on InnerTextParams.
class MODULES_EXPORT InnerTextPassagesBuilder final {
STACK_ALLOCATED();
public:
InnerTextPassagesBuilder(const InnerTextPassagesBuilder&) = delete;
InnerTextPassagesBuilder& operator=(const InnerTextPassagesBuilder&) = delete;
static mojom::blink::InnerTextFramePtr Build(
LocalFrame& frame,
const mojom::blink::InnerTextParams& params);
private:
explicit InnerTextPassagesBuilder(
const mojom::blink::InnerTextParams& params);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_CONTENT_EXTRACTION_INNER_TEXT_BUILDER_H_
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