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111 lines
4.1 KiB
C++
111 lines
4.1 KiB
C++
/*
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* Copyright (C) 2010, 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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#ifndef SKY_ENGINE_WTF_TEXT_TEXTPOSITION_H_
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#define SKY_ENGINE_WTF_TEXT_TEXTPOSITION_H_
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#include "flutter/sky/engine/wtf/Assertions.h"
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#include "flutter/sky/engine/wtf/Vector.h"
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#include "flutter/sky/engine/wtf/WTFExport.h"
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#include "flutter/sky/engine/wtf/text/WTFString.h"
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namespace WTF {
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// An abstract number of element in a sequence. The sequence has a first
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// element. This type should be used instead of integer because 2 contradicting
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// traditions can call a first element '0' or '1' which makes integer type
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// ambiguous.
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class OrdinalNumber {
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public:
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static OrdinalNumber fromZeroBasedInt(int zeroBasedInt) {
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return OrdinalNumber(zeroBasedInt);
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}
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static OrdinalNumber fromOneBasedInt(int oneBasedInt) {
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return OrdinalNumber(oneBasedInt - 1);
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}
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OrdinalNumber() : m_zeroBasedValue(0) {}
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int zeroBasedInt() const { return m_zeroBasedValue; }
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int oneBasedInt() const { return m_zeroBasedValue + 1; }
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bool operator==(OrdinalNumber other) {
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return m_zeroBasedValue == other.m_zeroBasedValue;
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}
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bool operator!=(OrdinalNumber other) { return !((*this) == other); }
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static OrdinalNumber first() { return OrdinalNumber(0); }
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static OrdinalNumber beforeFirst() { return OrdinalNumber(-1); }
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private:
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OrdinalNumber(int zeroBasedInt) : m_zeroBasedValue(zeroBasedInt) {}
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int m_zeroBasedValue;
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};
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// TextPosition structure specifies coordinates within an text resource. It is
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// used mostly for saving script source position.
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class TextPosition {
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public:
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TextPosition(OrdinalNumber line, OrdinalNumber column)
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: m_line(line), m_column(column) {}
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TextPosition() {}
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bool operator==(const TextPosition& other) {
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return m_line == other.m_line && m_column == other.m_column;
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}
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bool operator!=(const TextPosition& other) { return !((*this) == other); }
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WTF_EXPORT OrdinalNumber toOffset(const Vector<unsigned>&);
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// A 'minimum' value of position, used as a default value.
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static TextPosition minimumPosition() {
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return TextPosition(OrdinalNumber::first(), OrdinalNumber::first());
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}
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// A value with line value less than a minimum; used as an impossible
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// position.
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static TextPosition belowRangePosition() {
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return TextPosition(OrdinalNumber::beforeFirst(),
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OrdinalNumber::beforeFirst());
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}
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// A value corresponding to a position with given offset within text having
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// the specified line ending offsets.
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WTF_EXPORT static TextPosition fromOffsetAndLineEndings(
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unsigned,
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const Vector<unsigned>&);
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OrdinalNumber m_line;
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OrdinalNumber m_column;
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};
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WTF_EXPORT PassOwnPtr<Vector<unsigned>> lineEndings(const String&);
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} // namespace WTF
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using WTF::OrdinalNumber;
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using WTF::TextPosition;
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using WTF::lineEndings;
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#endif // SKY_ENGINE_WTF_TEXT_TEXTPOSITION_H_
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