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