1 /* 2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. 3 * Copyright (C) 2009 Dominik Rttsches <dominik.roettsches (at) access-company.com> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "config.h" 28 #include "core/platform/text/TextBoundaries.h" 29 30 #include "core/platform/text/TextBreakIterator.h" 31 #include "wtf/text/StringImpl.h" 32 #include "wtf/unicode/Unicode.h" 33 34 using namespace WTF; 35 using namespace Unicode; 36 37 namespace WebCore { 38 39 int endOfFirstWordBoundaryContext(const UChar* characters, int length) 40 { 41 for (int i = 0; i < length; ) { 42 int first = i; 43 UChar32 ch; 44 U16_NEXT(characters, i, length, ch); 45 if (!requiresContextForWordBoundary(ch)) 46 return first; 47 } 48 return length; 49 } 50 51 int startOfLastWordBoundaryContext(const UChar* characters, int length) 52 { 53 for (int i = length; i > 0; ) { 54 int last = i; 55 UChar32 ch; 56 U16_PREV(characters, 0, i, ch); 57 if (!requiresContextForWordBoundary(ch)) 58 return last; 59 } 60 return 0; 61 } 62 63 int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward) 64 { 65 TextBreakIterator* it = wordBreakIterator(chars, len); 66 67 if (forward) { 68 position = textBreakFollowing(it, position); 69 while (position != TextBreakDone) { 70 // We stop searching when the character preceeding the break 71 // is alphanumeric. 72 if (position < len && isAlphanumeric(chars[position - 1])) 73 return position; 74 75 position = textBreakFollowing(it, position); 76 } 77 78 return len; 79 } else { 80 position = textBreakPreceding(it, position); 81 while (position != TextBreakDone) { 82 // We stop searching when the character following the break 83 // is alphanumeric. 84 if (position > 0 && isAlphanumeric(chars[position])) 85 return position; 86 87 position = textBreakPreceding(it, position); 88 } 89 90 return 0; 91 } 92 } 93 94 void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end) 95 { 96 TextBreakIterator* it = wordBreakIterator(chars, len); 97 *end = textBreakFollowing(it, position); 98 if (*end < 0) 99 *end = textBreakLast(it); 100 *start = textBreakPrevious(it); 101 } 102 103 104 } // namespace WebCore 105