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111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/*
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* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
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* Copyright (C) 2009 Dominik Röttsches <dominik.roettsches@access-company.com>
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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 COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "flutter/sky/engine/platform/text/TextBoundaries.h"
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#include "flutter/sky/engine/platform/text/TextBreakIterator.h"
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#include "flutter/sky/engine/wtf/text/StringImpl.h"
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using namespace WTF;
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using namespace Unicode;
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namespace blink {
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int endOfFirstWordBoundaryContext(const UChar* characters, int length) {
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for (int i = 0; i < length;) {
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int first = i;
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UChar32 ch;
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U16_NEXT(characters, i, length, ch);
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if (!requiresContextForWordBoundary(ch))
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return first;
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}
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return length;
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}
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int startOfLastWordBoundaryContext(const UChar* characters, int length) {
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for (int i = length; i > 0;) {
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int last = i;
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UChar32 ch;
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U16_PREV(characters, 0, i, ch);
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if (!requiresContextForWordBoundary(ch))
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return last;
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}
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return 0;
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}
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int findNextWordFromIndex(const UChar* chars,
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int len,
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int position,
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bool forward) {
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TextBreakIterator* it = wordBreakIterator(chars, len);
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if (forward) {
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position = it->following(position);
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while (position != TextBreakDone) {
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// We stop searching when the character preceeding the break
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// is alphanumeric.
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if (position < len && isAlphanumeric(chars[position - 1]))
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return position;
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position = it->following(position);
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}
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return len;
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} else {
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position = it->preceding(position);
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while (position != TextBreakDone) {
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// We stop searching when the character following the break
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// is alphanumeric.
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if (position > 0 && isAlphanumeric(chars[position]))
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return position;
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position = it->preceding(position);
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}
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return 0;
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}
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}
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void findWordBoundary(const UChar* chars,
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int len,
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int position,
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int* start,
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int* end) {
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TextBreakIterator* it = wordBreakIterator(chars, len);
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*end = it->following(position);
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if (*end < 0)
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*end = it->last();
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*start = it->previous();
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}
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int findWordEndBoundary(const UChar* chars, int len, int position) {
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TextBreakIterator* it = wordBreakIterator(chars, len);
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int end = it->following(position);
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return end < 0 ? it->last() : end;
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}
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} // namespace blink
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