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71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
/*
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* Copyright (C) 2013, Google 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'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (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/wtf/text/TextPosition.h"
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#include "flutter/sky/engine/wtf/PassOwnPtr.h"
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#include "flutter/sky/engine/wtf/StdLibExtras.h"
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namespace WTF {
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PassOwnPtr<Vector<unsigned>> lineEndings(const String& text) {
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OwnPtr<Vector<unsigned>> result(adoptPtr(new Vector<unsigned>()));
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unsigned start = 0;
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while (start < text.length()) {
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size_t lineEnd = text.find('\n', start);
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if (lineEnd == kNotFound)
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break;
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result->append(static_cast<unsigned>(lineEnd));
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start = lineEnd + 1;
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}
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result->append(text.length());
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return result.release();
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}
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OrdinalNumber TextPosition::toOffset(const Vector<unsigned>& lineEndings) {
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unsigned lineStartOffset = m_line != OrdinalNumber::first()
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? lineEndings.at(m_line.zeroBasedInt() - 1) + 1
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: 0;
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return OrdinalNumber::fromZeroBasedInt(lineStartOffset +
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m_column.zeroBasedInt());
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}
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TextPosition TextPosition::fromOffsetAndLineEndings(
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unsigned offset,
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const Vector<unsigned>& lineEndings) {
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const unsigned* foundLineEnding =
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std::lower_bound(lineEndings.begin(), lineEndings.end(), offset);
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int lineIndex = foundLineEnding - &lineEndings.at(0);
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unsigned lineStartOffset =
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lineIndex > 0 ? lineEndings.at(lineIndex - 1) + 1 : 0;
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int column = offset - lineStartOffset;
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return TextPosition(OrdinalNumber::fromZeroBasedInt(lineIndex),
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OrdinalNumber::fromZeroBasedInt(column));
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}
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} // namespace WTF
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