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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "core/editing/spellcheck/HotModeSpellCheckRequester.h" |
| 6 |
| 7 #include "core/editing/EditingUtilities.h" |
| 8 #include "core/editing/Editor.h" |
| 9 #include "core/editing/VisiblePosition.h" |
| 10 #include "core/editing/commands/CompositeEditCommand.h" |
| 11 #include "core/editing/commands/TypingCommand.h" |
| 12 #include "core/editing/iterators/BackwardsCharacterIterator.h" |
| 13 #include "core/editing/iterators/CharacterIterator.h" |
| 14 #include "core/editing/spellcheck/SpellCheckRequester.h" |
| 15 #include "core/editing/spellcheck/SpellChecker.h" |
| 16 |
| 17 namespace blink { |
| 18 |
| 19 namespace { |
| 20 |
| 21 const int kHotModeChunkSize = 1024; |
| 22 |
| 23 bool isInOrAdjacentToWord(const Position& pos) { |
| 24 const VisiblePosition& visiblePos = createVisiblePosition(pos); |
| 25 const VisiblePosition& wordStart = previousWordPosition(visiblePos); |
| 26 if (wordStart.isNull()) |
| 27 return false; |
| 28 const VisiblePosition& wordEnd = endOfWord(wordStart); |
| 29 if (wordEnd.isNull()) |
| 30 return false; |
| 31 return comparePositions(visiblePos, wordEnd) <= 0; |
| 32 } |
| 33 |
| 34 bool isTypingInPartialWord(const Element& editable) { |
| 35 const LocalFrame& frame = *editable.document().frame(); |
| 36 const SelectionInDOMTree& selection = frame.selection().selectionInDOMTree(); |
| 37 if (!selection.isCaret()) |
| 38 return false; |
| 39 if (rootEditableElementOf(selection.base()) != &editable) |
| 40 return false; |
| 41 |
| 42 CompositeEditCommand* typingCommand = |
| 43 frame.editor().lastTypingCommandIfStillOpenForTyping(); |
| 44 if (!typingCommand) |
| 45 return false; |
| 46 if (typingCommand->endingSelection().asSelection() != selection) |
| 47 return false; |
| 48 return isInOrAdjacentToWord(selection.base()); |
| 49 } |
| 50 |
| 51 bool shouldCheckRootEditableInHotMode(const Element& editable, |
| 52 const Position& position) { |
| 53 if (!editable.isSpellCheckingEnabled() && |
| 54 !SpellChecker::isSpellCheckingEnabledAt(position)) |
| 55 return false; |
| 56 if (editable.visibleBoundsInVisualViewport().isEmpty()) |
| 57 return false; |
| 58 // TODO(xiaochengh): Design more aggressive strategies to reduce checking when |
| 59 // we are just moving selection around without modifying anything. |
| 60 return !isTypingInPartialWord(editable); |
| 61 } |
| 62 |
| 63 EphemeralRange calculateHotModeCheckingRange(const Element& editable, |
| 64 const Position& position) { |
| 65 const EphemeralRange& fullRange = EphemeralRange::rangeOfContents(editable); |
| 66 const int fullLength = TextIterator::rangeLength(fullRange.startPosition(), |
| 67 fullRange.endPosition()); |
| 68 if (fullLength <= kHotModeChunkSize) |
| 69 return fullRange; |
| 70 |
| 71 TextIteratorBehavior behavior = TextIteratorBehavior::Builder() |
| 72 .setEmitsObjectReplacementCharacter(true) |
| 73 .build(); |
| 74 BackwardsCharacterIterator backwardIterator(fullRange.startPosition(), |
| 75 position, behavior); |
| 76 backwardIterator.advance(kHotModeChunkSize / 2); |
| 77 const Position& chunkStart = backwardIterator.endPosition(); |
| 78 CharacterIterator forwardIterator(position, fullRange.endPosition(), |
| 79 behavior); |
| 80 forwardIterator.advance(kHotModeChunkSize / 2); |
| 81 const Position& chunkEnd = forwardIterator.endPosition(); |
| 82 return expandRangeToSentenceBoundary(EphemeralRange(chunkStart, chunkEnd)); |
| 83 } |
| 84 |
| 85 } // namespace |
| 86 |
| 87 HotModeSpellCheckRequester::HotModeSpellCheckRequester( |
| 88 SpellCheckRequester& requester) |
| 89 : m_requester(requester) {} |
| 90 |
| 91 void HotModeSpellCheckRequester::checkSpellingAt(const Position& position) { |
| 92 const Element* rootEditable = rootEditableElementOf(position); |
| 93 if (!rootEditable || !rootEditable->isConnected()) |
| 94 return; |
| 95 |
| 96 if (m_processedRootEditables.contains(rootEditable)) |
| 97 return; |
| 98 m_processedRootEditables.push_back(rootEditable); |
| 99 |
| 100 if (!shouldCheckRootEditableInHotMode(*rootEditable, position)) |
| 101 return; |
| 102 |
| 103 SpellCheckRequest* request = SpellCheckRequest::create( |
| 104 calculateHotModeCheckingRange(*rootEditable, position)); |
| 105 m_requester->requestCheckingFor(request); |
| 106 } |
| 107 |
| 108 } // namespace blink |
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