1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* 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(DocumentUpdateReason::kEditing);
return frame->Selection()
.ComputeVisibleSelectionInDOMTree()
.ToNormalizedEphemeralRange();
}
} // namespace
SurroundingText::SurroundingText(LocalFrame* frame, wtf_size_t max_length)
: SurroundingText(ComputeRangeFromFrameSelection(frame), max_length) {}
SurroundingText::SurroundingText(const EphemeralRange& range,
wtf_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 wtf_size_t 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)
.SetEmitsPunctuationForReplacedElements(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_;
}
wtf_size_t SurroundingText::StartOffsetInTextContent() const {
return start_offset_in_text_content_;
}
wtf_size_t SurroundingText::EndOffsetInTextContent() const {
return end_offset_in_text_content_;
}
bool SurroundingText::IsEmpty() const {
return text_content_.empty();
}
} // namespace blink
|
