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| 1 /* | |
| 2 * Copyright (C) 2010 Apple 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. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #ifndef DecimalNumber_h | |
| 27 #define DecimalNumber_h | |
| 28 | |
| 29 #include <math.h> | |
| 30 | |
| 31 #include "wtf/MathExtras.h" | |
| 32 #include "wtf/WTFExport.h" | |
| 33 #include "wtf/dtoa.h" | |
| 34 | |
| 35 namespace WTF { | |
| 36 | |
| 37 class WTF_EXPORT DecimalNumber { | |
| 38 public: | |
| 39 DecimalNumber(double d) | |
| 40 { | |
| 41 ASSERT(std::isfinite(d)); | |
| 42 dtoa(m_significand, d, m_sign, m_exponent, m_precision); | |
| 43 | |
| 44 ASSERT(m_precision); | |
| 45 // Zero should always have exponent 0. | |
| 46 ASSERT(m_significand[0] != '0' || !m_exponent); | |
| 47 // No values other than zero should have a leading zero. | |
| 48 ASSERT(m_significand[0] != '0' || m_precision == 1); | |
| 49 // No values other than zero should have trailing zeros. | |
| 50 ASSERT(m_significand[0] == '0' || m_significand[m_precision - 1] != '0')
; | |
| 51 } | |
| 52 | |
| 53 unsigned bufferLengthForStringDecimal() const; | |
| 54 unsigned bufferLengthForStringExponential() const; | |
| 55 | |
| 56 unsigned toStringDecimal(LChar* buffer, unsigned bufferLength) const; | |
| 57 unsigned toStringExponential(LChar* buffer, unsigned bufferLength) const; | |
| 58 | |
| 59 bool sign() const { return m_sign; } | |
| 60 int exponent() const { return m_exponent; } | |
| 61 const char* significand() const { return m_significand; } // significand con
tains precision characters, is not null-terminated. | |
| 62 unsigned precision() const { return m_precision; } | |
| 63 | |
| 64 private: | |
| 65 bool m_sign; | |
| 66 int m_exponent; | |
| 67 DtoaBuffer m_significand; | |
| 68 unsigned m_precision; | |
| 69 }; | |
| 70 | |
| 71 } // namespace WTF | |
| 72 | |
| 73 using WTF::DecimalNumber; | |
| 74 | |
| 75 #endif // DecimalNumber_h | |
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Chromium Code Reviews
Issue 285643006:
Kill WTF::DecimalNumber class (Closed)
Base URL: svn://svn.chromium.org/blink/trunk