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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
* Copyright (C) 2009 Dominik Roettsches <dominik.roettsches@access-company.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/platform/text/text_boundaries.h"
#include "base/numerics/safe_conversions.h"
#include "third_party/blink/renderer/platform/text/text_break_iterator.h"
#include "third_party/blink/renderer/platform/wtf/text/character_names.h"
#include "third_party/blink/renderer/platform/wtf/text/unicode.h"
namespace blink {
int FindNextWordForward(base::span<const UChar> chars, int position) {
TextBreakIterator* it = WordBreakIterator(chars);
int len = base::checked_cast<int>(chars.size());
position = it->following(position);
while (position != kTextBreakDone) {
// We stop searching when the character preceeding the break
// is alphanumeric or underscore.
const auto prev = base::checked_cast<size_t>(position - 1);
if (position < len && (WTF::unicode::IsAlphanumeric(chars[prev]) ||
chars[prev] == kLowLineCharacter)) {
return position;
}
position = it->following(position);
}
return len;
}
int FindNextWordBackward(base::span<const UChar> chars, int position) {
TextBreakIterator* it = WordBreakIterator(chars);
position = it->preceding(position);
while (position != kTextBreakDone) {
// We stop searching when the character following the break
// is alphanumeric or underscore.
const auto cur = base::checked_cast<size_t>(position);
if (position > 0 && (WTF::unicode::IsAlphanumeric(chars[cur]) ||
chars[cur] == kLowLineCharacter)) {
return position;
}
position = it->preceding(position);
}
return 0;
}
int FindWordStartBoundary(base::span<const UChar> chars, int position) {
TextBreakIterator* it = WordBreakIterator(chars);
it->following(position);
return it->previous();
}
int FindWordEndBoundary(base::span<const UChar> chars, int position) {
TextBreakIterator* it = WordBreakIterator(chars);
int end = it->following(position);
return end < 0 ? it->last() : end;
}
} // namespace blink
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