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/*
* Copyright (C) 2004, 2006, 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 COMPUTER, 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 COMPUTER, 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_ITERATORS_TEXT_ITERATOR_TEXT_STATE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_ITERATORS_TEXT_ITERATOR_TEXT_STATE_H_
#include "base/optional.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/editing/iterators/forwards_text_buffer.h"
#include "third_party/blink/renderer/core/editing/iterators/text_iterator_behavior.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
class BackwardsTextBuffer;
class ContainerNode;
class HTMLElement;
class Text;
class CORE_EXPORT TextIteratorTextState {
STACK_ALLOCATED();
public:
explicit TextIteratorTextState(const TextIteratorBehavior&);
// Return properties of the current text.
unsigned length() const { return text_length_; }
UChar CharacterAt(unsigned index) const;
String GetTextForTesting() const;
void AppendTextToStringBuilder(StringBuilder&,
unsigned position = 0,
unsigned max_length = UINT_MAX) const;
void AppendTextTo(ForwardsTextBuffer* output,
unsigned position,
unsigned length_to_append) const;
void PrependTextTo(BackwardsTextBuffer* output,
unsigned position,
unsigned length_to_prepend) const;
// Emits code unit relative to |node|.
void EmitChar16AfterNode(UChar code_unit, const Node& node);
void EmitChar16AsNode(UChar code_unit, const Node& node);
void EmitChar16BeforeChildren(UChar code_unit,
const ContainerNode& container_node);
void EmitChar16BeforeNode(UChar code_unit, const Node& node);
// Emits |code_unit| before |offset| in |text_node|.
void EmitChar16Before(UChar code_unit,
const Text& text_node,
unsigned offset);
// Emits |code_unit| as replacement of code unit at |offset| in |text_node|.
void EmitReplacmentCodeUnit(UChar code_unit,
const Text& text_node,
unsigned offset);
void EmitText(const Text&,
unsigned position_start_offset,
unsigned position_end_offset,
const String&,
unsigned text_start_offset,
unsigned text_end_offset);
void EmitAltText(const HTMLElement&);
void UpdateForReplacedElement(const Node& node);
// Return position of the current text.
void UpdatePositionOffsets(const ContainerNode& container_node,
unsigned index) const;
unsigned PositionStartOffset() const;
unsigned PositionEndOffset() const;
const Node* PositionNode() const { return position_node_; }
const Node* PositionContainerNode() const { return position_container_node_; }
bool IsAfterPositionNode() const {
return position_node_type_ == PositionNodeType::kAfterNode;
}
bool IsBeforePositionNode() const {
return position_node_type_ == PositionNodeType::kBeforeNode;
}
bool IsBeforeCharacter() const {
return position_node_type_ == PositionNodeType::kBeforeCharacter;
}
bool IsBeforeChildren() const {
return position_node_type_ == PositionNodeType::kBeforeChildren;
}
bool IsInTextNode() const {
return position_node_type_ == PositionNodeType::kInText;
}
bool HasEmitted() const { return has_emitted_; }
UChar LastCharacter() const { return last_character_; }
void ResetRunInformation() {
position_node_ = nullptr;
text_length_ = 0;
}
private:
// Location of text run relative to |position_node_|.
enum class PositionNodeType {
kNone,
kAfterNode,
kAltText,
kAsNode,
kBeforeCharacter,
kBeforeChildren,
kBeforeNode,
kInText,
};
void ResetPositionContainerNode(PositionNodeType node_type, const Node& node);
void SetTextNodePosition(const Text& text_node,
unsigned start_offset,
unsigned end_offset);
void PopulateStringBuffer(const String& text, unsigned start, unsigned end);
void PopulateStringBufferFromChar16(UChar code_unit);
const TextIteratorBehavior behavior_;
unsigned text_length_ = 0;
// TODO(editing-dev): We should integrate single character buffer and
// string buffer.
// Used for whitespace characters that aren't in the DOM, so we can point at
// them.
// If non-zero, overrides |text_|.
UChar single_character_buffer_ = 0;
// The current text when |single_character_buffer_| is zero, in which case it
// is |text_.Substring(text_start_offset_, text_length_)|.
String text_;
// TODO(editing-dev): We should make |text_| to hold substring instead of
// entire string with |text_start_offset_| and |text_length_|.
unsigned text_start_offset_ = 0;
// Position of the current text, in the form to be returned from the iterator.
Member<const Node> position_node_;
// |Text| node when |position_node_type_ == kInText| or |ContainerNode|.
mutable Member<const Node> position_container_node_;
mutable base::Optional<unsigned> position_start_offset_;
mutable base::Optional<unsigned> position_end_offset_;
PositionNodeType position_node_type_ = PositionNodeType::kNone;
// Used when deciding whether to emit a "positioning" (e.g. newline) before
// any other content
bool has_emitted_ = false;
UChar last_character_ = 0;
DISALLOW_COPY_AND_ASSIGN(TextIteratorTextState);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_ITERATORS_TEXT_ITERATOR_TEXT_STATE_H_
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