1 /* 2 * (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. 4 * Copyright (C) 2007-2009 Torch Mobile, Inc. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 */ 21 22 #include "config.h" 23 #include "platform/text/TextBreakIterator.h" 24 25 namespace blink { 26 27 unsigned numGraphemeClusters(const String& string) 28 { 29 unsigned stringLength = string.length(); 30 31 if (!stringLength) 32 return 0; 33 34 // The only Latin-1 Extended Grapheme Cluster is CR LF 35 if (string.is8Bit() && !string.contains('\r')) 36 return stringLength; 37 38 NonSharedCharacterBreakIterator it(string); 39 if (!it) 40 return stringLength; 41 42 unsigned num = 0; 43 while (it.next() != TextBreakDone) 44 ++num; 45 return num; 46 } 47 48 unsigned numCharactersInGraphemeClusters(const String& string, unsigned numGraphemeClusters) 49 { 50 unsigned stringLength = string.length(); 51 52 if (!stringLength) 53 return 0; 54 55 // The only Latin-1 Extended Grapheme Cluster is CR LF 56 if (string.is8Bit() && !string.contains('\r')) 57 return std::min(stringLength, numGraphemeClusters); 58 59 NonSharedCharacterBreakIterator it(string); 60 if (!it) 61 return std::min(stringLength, numGraphemeClusters); 62 63 for (unsigned i = 0; i < numGraphemeClusters; ++i) { 64 if (it.next() == TextBreakDone) 65 return stringLength; 66 } 67 return it.current(); 68 } 69 70 } // namespace blink 71
