1/* 2 * Copyright (C) 2005, 2007, 2010 Apple 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'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "break_lines.h" 28 29#include "TextBreakIterator.h" 30#include <wtf/StdLibExtras.h> 31#include <wtf/unicode/CharacterNames.h> 32 33#if PLATFORM(MAC) 34#include <CoreServices/CoreServices.h> 35#endif 36 37namespace WebCore { 38 39static inline bool isBreakableSpace(UChar ch, bool treatNoBreakSpaceAsBreak) 40{ 41 switch (ch) { 42 case ' ': 43 case '\n': 44 case '\t': 45 return true; 46 case noBreakSpace: 47 return treatNoBreakSpaceAsBreak; 48 default: 49 return false; 50 } 51} 52 53static const UChar asciiLineBreakTableFirstChar = '!'; 54static const UChar asciiLineBreakTableLastChar = 127; 55 56// Pack 8 bits into one byte 57#define B(a, b, c, d, e, f, g, h) \ 58 ((a) | ((b) << 1) | ((c) << 2) | ((d) << 3) | ((e) << 4) | ((f) << 5) | ((g) << 6) | ((h) << 7)) 59 60// Line breaking table row for each digit (0-9) 61#define DI { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } 62 63// Line breaking table row for ascii letters (a-z A-Z) 64#define AL { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } 65 66#define F 0xFF 67 68// Line breaking table for printable ASCII characters. Line breaking opportunities in this table are as below: 69// - before openning punctuations such as '(', '<', '[', '{' after certain characters (compatible with Firefox 3.6); 70// - after '-' and '?' (backward-compatible, and compatible with Internet Explorer). 71// Please refer to <https://bugs.webkit.org/show_bug.cgi?id=37698> for line breaking matrixes of different browsers 72// and the ICU standard. 73static const unsigned char asciiLineBreakTable[][(asciiLineBreakTableLastChar - asciiLineBreakTableFirstChar) / 8 + 1] = { 74 // ! " # $ % & ' ( ) * + , - . / 0 1-8 9 : ; < = > ? @ A-X Y Z [ \ ] ^ _ ` a-x y z { | } ~ DEL 75 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // ! 76 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // " 77 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // # 78 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // $ 79 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // % 80 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // & 81 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // ' 82 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // ( 83 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // ) 84 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // * 85 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // + 86 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // , 87 { B(1, 1, 1, 1, 1, 1, 1, 1), B(1, 1, 1, 1, 1, 1, 1, 1), F, B(1, 1, 1, 1, 1, 1, 1, 1), F, F, F, B(1, 1, 1, 1, 1, 1, 1, 1), F, F, F, B(1, 1, 1, 1, 1, 1, 1, 1) }, // - 88 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // . 89 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // / 90 DI, DI, DI, DI, DI, DI, DI, DI, DI, DI, // 0-9 91 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // : 92 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // ; 93 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // < 94 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // = 95 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // > 96 { B(0, 0, 1, 1, 1, 1, 0, 1), B(0, 1, 1, 0, 1, 0, 0, 1), F, B(1, 0, 0, 1, 1, 1, 0, 1), F, F, F, B(1, 1, 1, 1, 0, 1, 1, 1), F, F, F, B(1, 1, 1, 1, 0, 1, 1, 0) }, // ? 97 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // @ 98 AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, // A-Z 99 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // [ 100 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // '\' 101 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // ] 102 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // ^ 103 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // _ 104 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // ` 105 AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, // a-z 106 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // { 107 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // | 108 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // } 109 { B(0, 0, 0, 0, 0, 0, 0, 1), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 1, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 1, 0, 0, 0, 0, 0) }, // ~ 110 { B(0, 0, 0, 0, 0, 0, 0, 0), B(0, 0, 0, 0, 0, 0, 0, 0), 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0), 0, 0, 0, B(0, 0, 0, 0, 0, 0, 0, 0) }, // DEL 111}; 112 113#undef B 114#undef F 115#undef DI 116#undef AL 117 118COMPILE_ASSERT(WTF_ARRAY_LENGTH(asciiLineBreakTable) == asciiLineBreakTableLastChar - asciiLineBreakTableFirstChar + 1, TestLineBreakTableConsistency); 119 120static inline bool shouldBreakAfter(UChar ch, UChar nextCh) 121{ 122 switch (ch) { 123 case ideographicComma: 124 case ideographicFullStop: 125 // FIXME: cases for ideographicComma and ideographicFullStop are a workaround for an issue in Unicode 5.0 126 // which is likely to be resolved in Unicode 5.1 <http://bugs.webkit.org/show_bug.cgi?id=17411>. 127 // We may want to remove or conditionalize this workaround at some point. 128#ifdef ANDROID_LAYOUT 129 // as '/' is used in uri which is always long, we would like to break it 130 case '/': 131#endif 132 return true; 133 default: 134 // If both ch and nextCh are ASCII characters, use a lookup table for enhanced speed and for compatibility 135 // with other browsers (see comments for asciiLineBreakTable for details). 136 if (ch >= asciiLineBreakTableFirstChar && ch <= asciiLineBreakTableLastChar 137 && nextCh >= asciiLineBreakTableFirstChar && nextCh <= asciiLineBreakTableLastChar) { 138 const unsigned char* tableRow = asciiLineBreakTable[ch - asciiLineBreakTableFirstChar]; 139 int nextChIndex = nextCh - asciiLineBreakTableFirstChar; 140 return tableRow[nextChIndex / 8] & (1 << (nextChIndex % 8)); 141 } 142 // Otherwise defer to the Unicode algorithm by returning false. 143 return false; 144 } 145} 146 147static inline bool needsLineBreakIterator(UChar ch) 148{ 149 return ch > asciiLineBreakTableLastChar && ch != noBreakSpace; 150} 151 152#if PLATFORM(MAC) && defined(BUILDING_ON_TIGER) 153static inline TextBreakLocatorRef lineBreakLocator() 154{ 155 TextBreakLocatorRef locator = 0; 156 UCCreateTextBreakLocator(0, 0, kUCTextBreakLineMask, &locator); 157 return locator; 158} 159#endif 160 161int nextBreakablePosition(LazyLineBreakIterator& lazyBreakIterator, int pos, bool treatNoBreakSpaceAsBreak) 162{ 163 const UChar* str = lazyBreakIterator.string(); 164 int len = lazyBreakIterator.length(); 165 int nextBreak = -1; 166 167 UChar lastCh = pos > 0 ? str[pos - 1] : 0; 168 for (int i = pos; i < len; i++) { 169 UChar ch = str[i]; 170 171 if (isBreakableSpace(ch, treatNoBreakSpaceAsBreak) || shouldBreakAfter(lastCh, ch)) 172 return i; 173 174 if (needsLineBreakIterator(ch) || needsLineBreakIterator(lastCh)) { 175 if (nextBreak < i && i) { 176#if !PLATFORM(MAC) || !defined(BUILDING_ON_TIGER) 177 TextBreakIterator* breakIterator = lazyBreakIterator.get(); 178 if (breakIterator) 179 nextBreak = textBreakFollowing(breakIterator, i - 1); 180#else 181 static TextBreakLocatorRef breakLocator = lineBreakLocator(); 182 if (breakLocator) { 183 UniCharArrayOffset nextUCBreak; 184 if (UCFindTextBreak(breakLocator, kUCTextBreakLineMask, 0, str, len, i, &nextUCBreak) == 0) 185 nextBreak = nextUCBreak; 186 } 187#endif 188 } 189 if (i == nextBreak && !isBreakableSpace(lastCh, treatNoBreakSpaceAsBreak)) 190 return i; 191 } 192 193 lastCh = ch; 194 } 195 196 return len; 197} 198 199} // namespace WebCore 200