| /* |
| * 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/Assertions.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 { |
| 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) { return m_zeroBasedValue == other.m_zeroBasedValue; } |
| bool operator!=(OrdinalNumber other) { 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 { |
| public: |
| TextPosition(OrdinalNumber line, OrdinalNumber column) |
| : m_line(line) |
| , m_column(column) |
| { |
| } |
| TextPosition() { } |
| bool operator==(const TextPosition& other) { return m_line == other.m_line && m_column == other.m_column; } |
| bool operator!=(const TextPosition& other) { return !((*this) == other); } |
| |
| // 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()); } |
| |
| OrdinalNumber m_line; |
| OrdinalNumber m_column; |
| }; |
| |
| } |
| |
| using WTF::OrdinalNumber; |
| |
| using WTF::TextPosition; |
| |
| #endif // TextPosition_h |