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/*
* Copyright (C) 2012 Google 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
*/
#include "third_party/blink/renderer/core/editing/surrounding_text.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/editing/editing_utilities.h"
#include "third_party/blink/renderer/core/editing/ephemeral_range.h"
#include "third_party/blink/renderer/core/editing/frame_selection.h"
#include "third_party/blink/renderer/core/editing/iterators/backwards_character_iterator.h"
#include "third_party/blink/renderer/core/editing/iterators/character_iterator.h"
#include "third_party/blink/renderer/core/editing/visible_selection.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/html/forms/html_form_control_element.h"
namespace blink {
namespace {
EphemeralRange ComputeRangeFromFrameSelection(LocalFrame* frame) {
// TODO(editing-dev): The use of UpdateStyleAndLayout
// needs to be audited. See http://crbug.com/590369 for more details.
frame->GetDocument()->UpdateStyleAndLayout();
return frame->Selection()
.ComputeVisibleSelectionInDOMTree()
.ToNormalizedEphemeralRange();
}
} // namespace
SurroundingText::SurroundingText(LocalFrame* frame, size_t max_length)
: SurroundingText(ComputeRangeFromFrameSelection(frame), max_length) {}
SurroundingText::SurroundingText(const EphemeralRange& range, size_t max_length)
: start_offset_in_text_content_(0), end_offset_in_text_content_(0) {
const Position start_position = range.StartPosition();
const Position end_position = range.EndPosition();
const unsigned half_max_length = max_length / 2;
Document* document = start_position.GetDocument();
// The position will have no document if it is null (as in no position).
if (!document || !document->documentElement())
return;
DCHECK(!document->NeedsLayoutTreeUpdate());
// The forward range starts at the selection end and ends at the document's
// or the input element's end. It will then be updated to only contain the
// text in the right range around the selection.
DCHECK_EQ(RootEditableElementOf(start_position),
RootEditableElementOf(end_position));
Element* const root_editable = RootEditableElementOf(start_position);
Element* const root_element =
root_editable ? root_editable : document->documentElement();
// Do not create surrounding text if start or end position is within a
// control.
if (HTMLFormControlElement::EnclosingFormControlElement(
start_position.ComputeContainerNode()) ||
HTMLFormControlElement::EnclosingFormControlElement(
end_position.ComputeContainerNode()))
return;
CharacterIterator forward_iterator(
end_position,
Position::LastPositionInNode(*root_element).ParentAnchoredEquivalent(),
TextIteratorBehavior::Builder().SetStopsOnFormControls(true).Build());
if (!forward_iterator.AtEnd())
forward_iterator.Advance(max_length - half_max_length);
// Same as with the forward range but with the backward range. The range
// starts at the document's or input element's start and ends at the selection
// start and will be updated.
BackwardsCharacterIterator backwards_iterator(
EphemeralRange(Position::FirstPositionInNode(*root_element)
.ParentAnchoredEquivalent(),
start_position),
TextIteratorBehavior::Builder().SetStopsOnFormControls(true).Build());
if (!backwards_iterator.AtEnd())
backwards_iterator.Advance(half_max_length);
// Upon some conditions backwards iterator yields invalid EndPosition() which
// causes a crash in TextIterator::RangeLength().
// TODO(editing-dev): Fix BackwardsCharacterIterator, http://crbug.com/758438.
if (backwards_iterator.EndPosition() > start_position ||
end_position > forward_iterator.StartPosition())
return;
const TextIteratorBehavior behavior =
TextIteratorBehavior::NoTrailingSpaceRangeLengthBehavior();
const Position content_start = backwards_iterator.EndPosition();
const Position content_end = forward_iterator.StartPosition();
start_offset_in_text_content_ =
TextIterator::RangeLength(content_start, start_position, behavior);
end_offset_in_text_content_ =
TextIterator::RangeLength(content_start, end_position, behavior);
text_content_ = PlainText(
EphemeralRange(content_start, content_end),
TextIteratorBehavior::EmitsObjectReplacementCharacterBehavior());
}
String SurroundingText::TextContent() const {
return text_content_;
}
size_t SurroundingText::StartOffsetInTextContent() const {
return start_offset_in_text_content_;
}
size_t SurroundingText::EndOffsetInTextContent() const {
return end_offset_in_text_content_;
}
bool SurroundingText::IsEmpty() const {
return text_content_.IsEmpty();
}
} // namespace blink
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