1 /* 2 * Copyright (C) 2011 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #include "config.h" 26 #include "DOMTextContentWalker.h" 27 28 #if OS(ANDROID) 29 30 #include "Range.h" 31 #include "TextIterator.h" 32 #include "VisiblePosition.h" 33 #include "VisibleSelection.h" 34 #include "visible_units.h" 35 36 namespace WebCore { 37 38 static PassRefPtr<Range> getRange(const Position& start, const Position& end) 39 { 40 return VisibleSelection(start.parentAnchoredEquivalent(), end.parentAnchoredEquivalent(), DOWNSTREAM).firstRange(); 41 } 42 43 DOMTextContentWalker::DOMTextContentWalker(const VisiblePosition& position, unsigned maxLength) 44 : m_hitOffsetInContent(0) 45 { 46 const unsigned halfMaxLength = maxLength / 2; 47 RefPtr<Range> forwardRange = makeRange(position, endOfDocument(position)); 48 if (!forwardRange) 49 return; 50 CharacterIterator forwardChar(forwardRange.get(), TextIteratorStopsOnFormControls); 51 forwardChar.advance(maxLength - halfMaxLength); 52 53 // No forward contents, started inside form control. 54 if (getRange(position.deepEquivalent(), forwardChar.range()->startPosition())->text().length() == 0) 55 return; 56 57 RefPtr<Range> backwardsRange = makeRange(startOfDocument(position), position); 58 if (!backwardsRange) 59 return; 60 BackwardsCharacterIterator backwardsChar(backwardsRange.get(), TextIteratorStopsOnFormControls); 61 backwardsChar.advance(halfMaxLength); 62 63 m_hitOffsetInContent = getRange(backwardsChar.range()->endPosition(), position.deepEquivalent())->text().length(); 64 m_contentRange = getRange(backwardsChar.range()->endPosition(), forwardChar.range()->startPosition()); 65 } 66 67 PassRefPtr<Range> DOMTextContentWalker::contentOffsetsToRange(unsigned startInContent, unsigned endInContent) 68 { 69 if (startInContent >= endInContent || endInContent > content().length()) 70 return 0; 71 72 CharacterIterator iterator(m_contentRange.get()); 73 iterator.advance(startInContent); 74 75 Position start = iterator.range()->startPosition(); 76 iterator.advance(endInContent - startInContent); 77 Position end = iterator.range()->startPosition(); 78 return getRange(start, end); 79 } 80 81 String DOMTextContentWalker::content() const 82 { 83 if (m_contentRange) 84 return m_contentRange->text(); 85 return String(); 86 } 87 88 unsigned DOMTextContentWalker::hitOffsetInContent() const 89 { 90 return m_hitOffsetInContent; 91 } 92 93 } // namespace WebCore 94 95 #endif // OS(ANDROID) 96
