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1 /* | |
2 * Copyright (C) 2010, Google Inc. All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions | |
6 * are met: | |
7 * 1. Redistributions of source code must retain the above copyright | |
8 * notice, this list of conditions and the following disclaimer. | |
9 * 2. Redistributions in binary form must reproduce the above copyright | |
10 * notice, this list of conditions and the following disclaimer in the | |
11 * documentation and/or other materials provided with the distribution. | |
12 * | |
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN
Y | |
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN
Y | |
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O
N | |
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 */ | |
24 | |
25 #ifndef TextPosition_h | |
26 #define TextPosition_h | |
27 | |
28 #include <wtf/Assertions.h> | |
29 | |
30 namespace WTF { | |
31 | |
32 // An abstract number of element in a sequence. The sequence has a first element
. | |
33 // This type should be used instead of integer because 2 contradicting tradition
s can | |
34 // call a first element '0' or '1' which makes integer type ambiguous. | |
35 class OrdinalNumber { | |
36 public: | |
37 static OrdinalNumber fromZeroBasedInt(int zeroBasedInt) { return OrdinalNumb
er(zeroBasedInt); } | |
38 static OrdinalNumber fromOneBasedInt(int oneBasedInt) { return OrdinalNumber
(oneBasedInt - 1); } | |
39 OrdinalNumber() : m_zeroBasedValue(0) { } | |
40 | |
41 int zeroBasedInt() const { return m_zeroBasedValue; } | |
42 int oneBasedInt() const { return m_zeroBasedValue + 1; } | |
43 | |
44 bool operator==(OrdinalNumber other) { return m_zeroBasedValue == other.m_ze
roBasedValue; } | |
45 bool operator!=(OrdinalNumber other) { return !((*this) == other); } | |
46 | |
47 static OrdinalNumber first() { return OrdinalNumber(0); } | |
48 static OrdinalNumber beforeFirst() { return OrdinalNumber(-1); } | |
49 | |
50 private: | |
51 OrdinalNumber(int zeroBasedInt) : m_zeroBasedValue(zeroBasedInt) { } | |
52 int m_zeroBasedValue; | |
53 }; | |
54 | |
55 | |
56 // TextPosition structure specifies coordinates within an text resource. It is u
sed mostly | |
57 // for saving script source position. | |
58 class TextPosition { | |
59 public: | |
60 TextPosition(OrdinalNumber line, OrdinalNumber column) | |
61 : m_line(line) | |
62 , m_column(column) | |
63 { | |
64 } | |
65 TextPosition() { } | |
66 bool operator==(const TextPosition& other) { return m_line == other.m_line &
& m_column == other.m_column; } | |
67 bool operator!=(const TextPosition& other) { return !((*this) == other); } | |
68 | |
69 // A 'minimum' value of position, used as a default value. | |
70 static TextPosition minimumPosition() { return TextPosition(OrdinalNumber::f
irst(), OrdinalNumber::first()); } | |
71 | |
72 // A value with line value less than a minimum; used as an impossible positi
on. | |
73 static TextPosition belowRangePosition() { return TextPosition(OrdinalNumber
::beforeFirst(), OrdinalNumber::beforeFirst()); } | |
74 | |
75 OrdinalNumber m_line; | |
76 OrdinalNumber m_column; | |
77 }; | |
78 | |
79 } | |
80 | |
81 using WTF::OrdinalNumber; | |
82 | |
83 using WTF::TextPosition; | |
84 | |
85 #endif // TextPosition_h | |
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