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| 1 /* | |
| 2 * Copyright (C) 2012 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #include "sky/engine/config.h" | |
| 32 #include "sky/engine/core/editing/SurroundingText.h" | |
| 33 | |
| 34 #include "sky/engine/core/dom/Document.h" | |
| 35 #include "sky/engine/core/dom/Element.h" | |
| 36 #include "sky/engine/core/dom/Position.h" | |
| 37 #include "sky/engine/core/dom/Range.h" | |
| 38 #include "sky/engine/core/editing/TextIterator.h" | |
| 39 | |
| 40 namespace blink { | |
| 41 | |
| 42 SurroundingText::SurroundingText(const Range& range, unsigned maxLength) | |
| 43 : m_startOffsetInContent(0) | |
| 44 , m_endOffsetInContent(0) | |
| 45 { | |
| 46 initialize(range.startPosition(), range.endPosition(), maxLength); | |
| 47 } | |
| 48 | |
| 49 SurroundingText::SurroundingText(const Position& position, unsigned maxLength) | |
| 50 : m_startOffsetInContent(0) | |
| 51 , m_endOffsetInContent(0) | |
| 52 { | |
| 53 initialize(position, position, maxLength); | |
| 54 } | |
| 55 | |
| 56 void SurroundingText::initialize(const Position& startPosition, const Position&
endPosition, unsigned maxLength) | |
| 57 { | |
| 58 ASSERT(startPosition.document() == endPosition.document()); | |
| 59 | |
| 60 const unsigned halfMaxLength = maxLength / 2; | |
| 61 | |
| 62 Document* document = startPosition.document(); | |
| 63 // The position will have no document if it is null (as in no position). | |
| 64 if (!document) | |
| 65 return; | |
| 66 | |
| 67 // The forward range starts at the selection end and ends at the document's | |
| 68 // end. It will then be updated to only contain the text in the text in the | |
| 69 // right range around the selection. | |
| 70 RefPtr<Range> forwardRange = Range::create(*document, endPosition, lastPosit
ionInNode(document->documentElement()).parentAnchoredEquivalent()); | |
| 71 CharacterIterator forwardIterator(forwardRange.get()); | |
| 72 // FIXME: why do we stop going trough the text if we were not able to select
something on the right? | |
| 73 if (!forwardIterator.atEnd()) | |
| 74 forwardIterator.advance(maxLength - halfMaxLength); | |
| 75 | |
| 76 forwardRange = forwardIterator.range(); | |
| 77 if (!forwardRange || !Range::create(*document, endPosition, forwardRange->st
artPosition())->text().length()) { | |
| 78 ASSERT(forwardRange); | |
| 79 return; | |
| 80 } | |
| 81 | |
| 82 // Same as with the forward range but with the backward range. The range | |
| 83 // starts at the document's start and ends at the selection start and will | |
| 84 // be updated. | |
| 85 RefPtr<Range> backwardsRange = Range::create(*document, firstPositionInNode(
document->documentElement()).parentAnchoredEquivalent(), startPosition); | |
| 86 BackwardsCharacterIterator backwardsIterator(backwardsRange.get()); | |
| 87 if (!backwardsIterator.atEnd()) | |
| 88 backwardsIterator.advance(halfMaxLength); | |
| 89 | |
| 90 backwardsRange = backwardsIterator.range(); | |
| 91 if (!backwardsRange) { | |
| 92 ASSERT(backwardsRange); | |
| 93 return; | |
| 94 } | |
| 95 | |
| 96 m_startOffsetInContent = Range::create(*document, backwardsRange->endPositio
n(), startPosition)->text().length(); | |
| 97 m_endOffsetInContent = Range::create(*document, backwardsRange->endPosition(
), endPosition)->text().length(); | |
| 98 m_contentRange = Range::create(*document, backwardsRange->endPosition(), for
wardRange->startPosition()); | |
| 99 ASSERT(m_contentRange); | |
| 100 } | |
| 101 | |
| 102 PassRefPtr<Range> SurroundingText::rangeFromContentOffsets(unsigned startOffsetI
nContent, unsigned endOffsetInContent) | |
| 103 { | |
| 104 if (startOffsetInContent >= endOffsetInContent || endOffsetInContent > conte
nt().length()) | |
| 105 return nullptr; | |
| 106 | |
| 107 CharacterIterator iterator(m_contentRange.get()); | |
| 108 | |
| 109 ASSERT(!iterator.atEnd()); | |
| 110 iterator.advance(startOffsetInContent); | |
| 111 | |
| 112 ASSERT(iterator.range()); | |
| 113 Position start = iterator.range()->startPosition(); | |
| 114 | |
| 115 ASSERT(!iterator.atEnd()); | |
| 116 iterator.advance(endOffsetInContent - startOffsetInContent); | |
| 117 | |
| 118 ASSERT(iterator.range()); | |
| 119 Position end = iterator.range()->startPosition(); | |
| 120 | |
| 121 ASSERT(start.document()); | |
| 122 return Range::create(*start.document(), start, end); | |
| 123 } | |
| 124 | |
| 125 String SurroundingText::content() const | |
| 126 { | |
| 127 if (m_contentRange) | |
| 128 return m_contentRange->text(); | |
| 129 return String(); | |
| 130 } | |
| 131 | |
| 132 unsigned SurroundingText::startOffsetInContent() const | |
| 133 { | |
| 134 return m_startOffsetInContent; | |
| 135 } | |
| 136 | |
| 137 unsigned SurroundingText::endOffsetInContent() const | |
| 138 { | |
| 139 return m_endOffsetInContent; | |
| 140 } | |
| 141 | |
| 142 } // namespace blink | |
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Chromium Code Reviews
Issue 928393003:
Remove the concept of document.documentElement (Closed)
Base URL: git@github.com:domokit/mojo.git@master