author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:32:07 +0300 | |
changeset 2 | 303757a437d3 |
parent 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2005, 2007, 2010 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
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* THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "break_lines.h" |
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|
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#include "CharacterNames.h" |
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#include "TextBreakIterator.h" |
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|
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#if PLATFORM(MAC) |
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#include <CoreServices/CoreServices.h> |
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#endif |
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namespace WebCore { |
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static inline bool isBreakableSpace(UChar ch, bool treatNoBreakSpaceAsBreak) |
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{ |
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switch (ch) { |
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case ' ': |
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case '\n': |
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case '\t': |
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return true; |
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case noBreakSpace: |
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return treatNoBreakSpaceAsBreak; |
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default: |
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return false; |
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} |
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} |
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|
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// This differs from the Unicode algorithm only in that Unicode does not break |
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// between a question mark and a vertical line (U+007C). |
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static const unsigned char internetExplorerLineBreaksAfterQuestionMarkTable[0x80] = { |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, // \t |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
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1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, // ! " ' ) , . / |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, // : ; ? |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, // ] |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1 // } |
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}; |
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|
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static const size_t internetExplorerLineBreaksAfterQuestionMarkTableSize = sizeof(internetExplorerLineBreaksAfterQuestionMarkTable) / sizeof(*internetExplorerLineBreaksAfterQuestionMarkTable); |
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|
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static inline bool shouldBreakAfter(UChar ch, UChar nextCh) |
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{ |
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switch (ch) { |
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// For a question mark preceding a non-ASCII characters, defer to the Unicode algorithm by returning false. |
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// For ASCII characters, use a lookup table for enhanced speed and for compatibility with Internet Explorer. |
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case '?': |
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return nextCh < internetExplorerLineBreaksAfterQuestionMarkTableSize && internetExplorerLineBreaksAfterQuestionMarkTable[nextCh]; |
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// Internet Explorer always allows breaking after a hyphen. |
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case '-': |
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case softHyphen: |
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// FIXME: cases for ideographicComma and ideographicFullStop are a workaround for an issue in Unicode 5.0 |
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// which is likely to be resolved in Unicode 5.1 <http://bugs.webkit.org/show_bug.cgi?id=17411>. |
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// We may want to remove or conditionalize this workaround at some point. |
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case ideographicComma: |
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case ideographicFullStop: |
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return true; |
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default: |
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return false; |
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} |
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} |
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|
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static inline bool needsLineBreakIterator(UChar ch) |
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{ |
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return ch > 0x7F && ch != noBreakSpace; |
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} |
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|
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#if PLATFORM(MAC) && defined(BUILDING_ON_TIGER) |
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static inline TextBreakLocatorRef lineBreakLocator() |
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{ |
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TextBreakLocatorRef locator = 0; |
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UCCreateTextBreakLocator(0, 0, kUCTextBreakLineMask, &locator); |
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return locator; |
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} |
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#endif |
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|
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int nextBreakablePosition(const UChar* str, int pos, int len, bool treatNoBreakSpaceAsBreak) |
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{ |
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#if !PLATFORM(MAC) || !defined(BUILDING_ON_TIGER) |
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TextBreakIterator* breakIterator = 0; |
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#endif |
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int nextBreak = -1; |
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|
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UChar lastCh = pos > 0 ? str[pos - 1] : 0; |
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for (int i = pos; i < len; i++) { |
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UChar ch = str[i]; |
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|
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if (isBreakableSpace(ch, treatNoBreakSpaceAsBreak) || shouldBreakAfter(lastCh, ch)) |
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return i; |
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|
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if (needsLineBreakIterator(ch) || needsLineBreakIterator(lastCh)) { |
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if (nextBreak < i && i) { |
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#if !PLATFORM(MAC) || !defined(BUILDING_ON_TIGER) |
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if (!breakIterator) |
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breakIterator = lineBreakIterator(str, len); |
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if (breakIterator) |
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nextBreak = textBreakFollowing(breakIterator, i - 1); |
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#else |
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static TextBreakLocatorRef breakLocator = lineBreakLocator(); |
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if (breakLocator) { |
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UniCharArrayOffset nextUCBreak; |
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if (UCFindTextBreak(breakLocator, kUCTextBreakLineMask, 0, str, len, i, &nextUCBreak) == 0) |
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nextBreak = nextUCBreak; |
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} |
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#endif |
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} |
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if (i == nextBreak && !isBreakableSpace(lastCh, treatNoBreakSpaceAsBreak)) |
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return i; |
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} |
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|
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lastCh = ch; |
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} |
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|
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return len; |
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} |
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|
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} // namespace WebCore |