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// Copyright 2017 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.
#include "third_party/blink/renderer/core/editing/spellcheck/cold_mode_spell_check_requester.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/idle_deadline.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/character_iterator.h"
#include "third_party/blink/renderer/core/editing/selection_template.h"
#include "third_party/blink/renderer/core/editing/spellcheck/spell_check_requester.h"
#include "third_party/blink/renderer/core/editing/spellcheck/spell_checker.h"
#include "third_party/blink/renderer/core/editing/visible_position.h"
#include "third_party/blink/renderer/core/editing/visible_units.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
namespace blink {
namespace {
const int kColdModeChunkSize = 16384; // in UTF16 code units
const int kInvalidChunkIndex = -1;
} // namespace
void ColdModeSpellCheckRequester::Trace(Visitor* visitor) {
visitor->Trace(frame_);
visitor->Trace(root_editable_);
visitor->Trace(remaining_check_range_);
}
ColdModeSpellCheckRequester::ColdModeSpellCheckRequester(LocalFrame& frame)
: frame_(frame),
last_chunk_index_(kInvalidChunkIndex),
needs_more_invocation_for_testing_(false) {}
bool ColdModeSpellCheckRequester::FullyChecked() const {
if (needs_more_invocation_for_testing_) {
needs_more_invocation_for_testing_ = false;
return false;
}
// Note that DOM mutations between cold mode invocations may corrupt the
// stored states, in which case we also consider checking as finished.
return !root_editable_ || !remaining_check_range_ ||
remaining_check_range_->collapsed() ||
!remaining_check_range_->IsConnected() ||
!root_editable_->contains(
remaining_check_range_->commonAncestorContainer());
}
SpellCheckRequester& ColdModeSpellCheckRequester::GetSpellCheckRequester()
const {
return GetFrame().GetSpellChecker().GetSpellCheckRequester();
}
const Element* ColdModeSpellCheckRequester::CurrentFocusedEditable() const {
const Position position =
GetFrame().Selection().GetSelectionInDOMTree().Extent();
if (position.IsNull())
return nullptr;
const auto* element = DynamicTo<Element>(HighestEditableRoot(position));
if (!element || !element->isConnected())
return nullptr;
if (!element->IsSpellCheckingEnabled() ||
!SpellChecker::IsSpellCheckingEnabledAt(position))
return nullptr;
return element;
}
void ColdModeSpellCheckRequester::Invoke(IdleDeadline* deadline) {
TRACE_EVENT0("blink", "ColdModeSpellCheckRequester::invoke");
// TODO(xiaochengh): Figure out if this has any performance impact.
GetFrame().GetDocument()->UpdateStyleAndLayout();
const Element* current_focused = CurrentFocusedEditable();
if (!current_focused) {
ClearProgress();
return;
}
if (root_editable_ != current_focused) {
ClearProgress();
root_editable_ = current_focused;
last_chunk_index_ = 0;
remaining_check_range_ = Range::Create(root_editable_->GetDocument());
remaining_check_range_->selectNodeContents(
const_cast<Element*>(root_editable_.Get()), ASSERT_NO_EXCEPTION);
}
while (deadline->timeRemaining() > 0) {
if (FullyChecked()) {
SetHasFullyChecked();
return;
}
RequestCheckingForNextChunk();
}
}
void ColdModeSpellCheckRequester::ClearProgress() {
root_editable_ = nullptr;
last_chunk_index_ = kInvalidChunkIndex;
if (!remaining_check_range_)
return;
remaining_check_range_->Dispose();
remaining_check_range_ = nullptr;
}
void ColdModeSpellCheckRequester::SetHasFullyChecked() {
DCHECK(root_editable_);
last_chunk_index_ = kInvalidChunkIndex;
if (!remaining_check_range_)
return;
remaining_check_range_->Dispose();
remaining_check_range_ = nullptr;
}
void ColdModeSpellCheckRequester::RequestCheckingForNextChunk() {
DCHECK(root_editable_);
DCHECK(!FullyChecked());
const EphemeralRange remaining_range(remaining_check_range_);
const int remaining_length = TextIterator::RangeLength(
remaining_range,
// Same behavior used in |CalculateCharacterSubrange()|
TextIteratorBehavior::EmitsObjectReplacementCharacterBehavior());
if (remaining_length == 0) {
SetHasFullyChecked();
return;
}
const int chunk_index = last_chunk_index_ + 1;
const Position chunk_start = remaining_range.StartPosition();
const Position chunk_end =
CalculateCharacterSubrange(remaining_range, 0,
std::min(remaining_length, kColdModeChunkSize))
.EndPosition();
// Chromium spellchecker requires complete sentences to be checked. However,
// EndOfSentence() sometimes returns null or out-of-editable positions, which
// are corrected here.
const Position extended_end = EndOfSentence(chunk_end).GetPosition();
const Position check_end =
extended_end.IsNull() || extended_end < chunk_end
? chunk_end
: std::min(extended_end, remaining_range.EndPosition());
const EphemeralRange check_range(chunk_start, check_end);
GetSpellCheckRequester().RequestCheckingFor(check_range, chunk_index);
last_chunk_index_ = chunk_index;
remaining_check_range_->setStart(check_range.EndPosition());
}
} // namespace blink
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