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comparison: mfbt/decimal/Decimal.h

mfbt/decimal/Decimal.h

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1 /*
2 * Copyright (C) 2012 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /**
32 * Imported from:
33 * http://src.chromium.org/viewvc/blink/trunk/Source/core/platform/Decimal.h
34 * Check hg log for the svn rev of the last update from Blink core.
35 */
36
37 #ifndef Decimal_h
38 #define Decimal_h
39
40 #include "mozilla/Assertions.h"
41 #include <stdint.h>
42 #include "mozilla/Types.h"
43
44 #include <string>
45
46 #ifndef ASSERT
47 #define DEFINED_ASSERT_FOR_DECIMAL_H 1
48 #define ASSERT MOZ_ASSERT
49 #endif
50
51 // To use WTF_MAKE_FAST_ALLOCATED we'd need:
52 // http://src.chromium.org/viewvc/blink/trunk/Source/wtf/FastMalloc.h
53 // Since we don't allocate Decimal objects, no need.
54 #define WTF_MAKE_FAST_ALLOCATED \
55 void ignore_this_dummy_method() MOZ_DELETE
56
57 namespace WebCore {
58
59 namespace DecimalPrivate {
60 class SpecialValueHandler;
61 }
62
63 // This class represents decimal base floating point number.
64 //
65 // FIXME: Once all C++ compiler support decimal type, we should replace this
66 // class to compiler supported one. See below URI for current status of decimal
67 // type for C++: // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1977.html
68 class Decimal {
69 WTF_MAKE_FAST_ALLOCATED;
70 public:
71 enum Sign {
72 Positive,
73 Negative,
74 };
75
76 // You should not use EncodedData other than unit testing.
77 class EncodedData {
78 // For accessing FormatClass.
79 friend class Decimal;
80 friend class DecimalPrivate::SpecialValueHandler;
81 public:
82 EncodedData(Sign, int exponent, uint64_t coefficient);
83
84 bool operator==(const EncodedData&) const;
85 bool operator!=(const EncodedData& another) const { return !operator==(another); }
86
87 uint64_t coefficient() const { return m_coefficient; }
88 int countDigits() const;
89 int exponent() const { return m_exponent; }
90 bool isFinite() const { return !isSpecial(); }
91 bool isInfinity() const { return m_formatClass == ClassInfinity; }
92 bool isNaN() const { return m_formatClass == ClassNaN; }
93 bool isSpecial() const { return m_formatClass == ClassInfinity || m_formatClass == ClassNaN; }
94 bool isZero() const { return m_formatClass == ClassZero; }
95 Sign sign() const { return m_sign; }
96 void setSign(Sign sign) { m_sign = sign; }
97
98 private:
99 enum FormatClass {
100 ClassInfinity,
101 ClassNormal,
102 ClassNaN,
103 ClassZero,
104 };
105
106 EncodedData(Sign, FormatClass);
107 FormatClass formatClass() const { return m_formatClass; }
108
109 uint64_t m_coefficient;
110 int16_t m_exponent;
111 FormatClass m_formatClass;
112 Sign m_sign;
113 };
114
115 MFBT_API Decimal(int32_t = 0);
116 MFBT_API Decimal(Sign, int exponent, uint64_t coefficient);
117 MFBT_API Decimal(const Decimal&);
118
119 MFBT_API Decimal& operator=(const Decimal&);
120 MFBT_API Decimal& operator+=(const Decimal&);
121 MFBT_API Decimal& operator-=(const Decimal&);
122 MFBT_API Decimal& operator*=(const Decimal&);
123 MFBT_API Decimal& operator/=(const Decimal&);
124
125 MFBT_API Decimal operator-() const;
126
127 MFBT_API bool operator==(const Decimal&) const;
128 MFBT_API bool operator!=(const Decimal&) const;
129 MFBT_API bool operator<(const Decimal&) const;
130 MFBT_API bool operator<=(const Decimal&) const;
131 MFBT_API bool operator>(const Decimal&) const;
132 MFBT_API bool operator>=(const Decimal&) const;
133
134 MFBT_API Decimal operator+(const Decimal&) const;
135 MFBT_API Decimal operator-(const Decimal&) const;
136 MFBT_API Decimal operator*(const Decimal&) const;
137 MFBT_API Decimal operator/(const Decimal&) const;
138
139 int exponent() const
140 {
141 ASSERT(isFinite());
142 return m_data.exponent();
143 }
144
145 bool isFinite() const { return m_data.isFinite(); }
146 bool isInfinity() const { return m_data.isInfinity(); }
147 bool isNaN() const { return m_data.isNaN(); }
148 bool isNegative() const { return sign() == Negative; }
149 bool isPositive() const { return sign() == Positive; }
150 bool isSpecial() const { return m_data.isSpecial(); }
151 bool isZero() const { return m_data.isZero(); }
152
153 MFBT_API Decimal abs() const;
154 MFBT_API Decimal ceiling() const;
155 MFBT_API Decimal floor() const;
156 MFBT_API Decimal remainder(const Decimal&) const;
157 MFBT_API Decimal round() const;
158
159 MFBT_API double toDouble() const;
160 // Note: toString method supports infinity and nan but fromString not.
161 MFBT_API std::string toString() const;
162 MFBT_API bool toString(char* strBuf, size_t bufLength) const;
163
164 static MFBT_API Decimal fromDouble(double);
165 // fromString supports following syntax EBNF:
166 // number ::= sign? digit+ ('.' digit*) (exponent-marker sign? digit+)?
167 // | sign? '.' digit+ (exponent-marker sign? digit+)?
168 // sign ::= '+' | '-'
169 // exponent-marker ::= 'e' | 'E'
170 // digit ::= '0' | '1' | ... | '9'
171 // Note: fromString doesn't support "infinity" and "nan".
172 static MFBT_API Decimal fromString(const std::string& aValue);
173 static MFBT_API Decimal infinity(Sign);
174 static MFBT_API Decimal nan();
175 static MFBT_API Decimal zero(Sign);
176
177 // You should not use below methods. We expose them for unit testing.
178 MFBT_API explicit Decimal(const EncodedData&);
179 const EncodedData& value() const { return m_data; }
180
181 private:
182 struct AlignedOperands {
183 uint64_t lhsCoefficient;
184 uint64_t rhsCoefficient;
185 int exponent;
186 };
187
188 MFBT_API Decimal(double);
189 MFBT_API Decimal compareTo(const Decimal&) const;
190
191 static MFBT_API AlignedOperands alignOperands(const Decimal& lhs, const Decimal& rhs);
192 static inline Sign invertSign(Sign sign) { return sign == Negative ? Positive : Negative; }
193
194 Sign sign() const { return m_data.sign(); }
195
196 EncodedData m_data;
197 };
198
199 } // namespace WebCore
200
201 namespace mozilla {
202 typedef WebCore::Decimal Decimal;
203 }
204
205 #undef WTF_MAKE_FAST_ALLOCATED
206
207 #ifdef DEFINED_ASSERT_FOR_DECIMAL_H
208 #undef DEFINED_ASSERT_FOR_DECIMAL_H
209 #undef ASSERT
210 #endif
211
212 #endif // Decimal_h
213

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