chromium/src/third_party/blink/renderer/core/editing/commands/editing_commands_utilities.h

/*
 * Copyright (C) 2004, 2006, 2008 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,
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// Copyright 2018 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.

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_EDITING_COMMANDS_UTILITIES_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_EDITING_COMMANDS_UTILITIES_H_

#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/editing/forward.h"
#include "third_party/blink/renderer/core/editing/text_granularity.h"
#include "third_party/blink/renderer/core/editing/visible_units.h"
#include "third_party/blink/renderer/core/events/input_event.h"
#include "third_party/blink/renderer/platform/wtf/text/character_names.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"

namespace blink {

enum class DeleteDirection {
  kForward,
  kBackward,
};

class CompositeEditCommand;
class Document;
class Element;
class HTMLElement;
class Node;
class QualifiedName;
class SelectionForUndoStep;
class SetSelectionOptions;

// -------------------------------------------------------------------------
// Node
// -------------------------------------------------------------------------

Node* HighestNodeToRemoveInPruning(Node*, const Node* exclude_node = nullptr);

Node* EnclosingEmptyListItem(const VisiblePosition&);

bool IsTableStructureNode(const Node*);
bool IsNodeRendered(const Node&);
bool IsInline(const Node*);
// Returns true if specified nodes are elements, have identical tag names,
// have identical attributes, and are editable.
CORE_EXPORT bool AreIdenticalElements(const Node&, const Node&);

// -------------------------------------------------------------------------
// Position
// -------------------------------------------------------------------------

Position PositionBeforeContainingSpecialElement(
    const Position&,
    HTMLElement** containing_special_element = nullptr);
Position PositionAfterContainingSpecialElement(
    const Position&,
    HTMLElement** containing_special_element = nullptr);

bool LineBreakExistsAtPosition(const Position&);

// miscellaneous functions on Position

enum WhitespacePositionOption {
  kNotConsiderNonCollapsibleWhitespace,
  kConsiderNonCollapsibleWhitespace
};

// |leadingCollapsibleWhitespacePosition(position)| returns a previous position
// of |position| if it is at collapsible whitespace, otherwise it returns null
// position. When it is called with |NotConsiderNonCollapsibleWhitespace| and
// a previous position in a element which has CSS property "white-space:pre",
// or its variant, |leadingCollapsibleWhitespacePosition()| returns null
// position.
Position LeadingCollapsibleWhitespacePosition(
    const Position&,
    TextAffinity,
    WhitespacePositionOption = kNotConsiderNonCollapsibleWhitespace);

unsigned NumEnclosingMailBlockquotes(const Position&);

// -------------------------------------------------------------------------
// VisiblePosition
// -------------------------------------------------------------------------

bool LineBreakExistsAtVisiblePosition(const VisiblePosition&);

// -------------------------------------------------------------------------
// HTMLElement
// -------------------------------------------------------------------------

HTMLElement* CreateHTMLElement(Document&, const QualifiedName&);
HTMLElement* EnclosingList(const Node*);
HTMLElement* OutermostEnclosingList(const Node*,
                                    const HTMLElement* root_list = nullptr);
Node* EnclosingListChild(const Node*);

// -------------------------------------------------------------------------
// Element
// -------------------------------------------------------------------------

bool CanMergeLists(const Element& first_list, const Element& second_list);

// -------------------------------------------------------------------------
// VisibleSelection
// -------------------------------------------------------------------------

// Functions returning VisibleSelection
VisibleSelection SelectionForParagraphIteration(const VisibleSelection&);

const String& NonBreakingSpaceString();

CORE_EXPORT void TidyUpHTMLStructure(Document&);

SelectionInDOMTree CorrectedSelectionAfterCommand(const SelectionForUndoStep&,
                                                  const Document*);
void ChangeSelectionAfterCommand(LocalFrame*,
                                 const SelectionInDOMTree&,
                                 const SetSelectionOptions&);

// -------------------------------------------------------------------------
// Events
// -------------------------------------------------------------------------

void DispatchEditableContentChangedEvents(Element* start_root,
                                          Element* end_root);
void DispatchInputEventEditableContentChanged(Element* start_root,
                                              Element* end_root,
                                              InputEvent::InputType,
                                              const String&,
                                              InputEvent::EventIsComposing);
InputEvent::EventIsComposing IsComposingFromCommand(
    const CompositeEditCommand*);

InputEvent::InputType DeletionInputTypeFromTextGranularity(DeleteDirection,
                                                           TextGranularity);

// -------------------------------------------------------------------------
// Blocks (true paragraphs; line break elements don't break blocks)
// -------------------------------------------------------------------------
//
VisiblePosition StartOfBlock(
    const VisiblePosition&,
    EditingBoundaryCrossingRule = kCannotCrossEditingBoundary);
VisiblePosition EndOfBlock(
    const VisiblePosition&,
    EditingBoundaryCrossingRule = kCannotCrossEditingBoundary);
bool IsStartOfBlock(const VisiblePosition&);
bool IsEndOfBlock(const VisiblePosition&);

}  // namespace blink

#endif