+++ /dev/null
-/*
- * Copyright (C) 2010 Apple 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. ``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
- * 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.
- */
-
-#include "config.h"
-#include "DecimalNumber.h"
-#include <math.h>
-#include <wtf/MathExtras.h>
-#include <wtf/text/WTFString.h>
-
-namespace WTF {
-
-unsigned DecimalNumber::bufferLengthForStringDecimal() const
-{
- unsigned length = 0;
- // if the exponent is negative the number decimal representation is of the form:
- // [<sign>]0.[<zeros>]<significand>
- if (m_exponent < 0) {
- if (m_sign)
- ++length;
- length += 2; // for "0."
- length += -m_exponent - 1;
- length += m_precision;
- return length;
- }
-
- unsigned digitsBeforeDecimalPoint = m_exponent + 1;
-
- // If the precision is <= than the number of digits to get up to the decimal
- // point, then there is no fractional part, number is of the form:
- // [<sign>]<significand>[<zeros>]
- if (m_precision <= digitsBeforeDecimalPoint) {
- if (m_sign)
- ++length;
- length += m_precision;
- length += digitsBeforeDecimalPoint - m_precision;
- return length;
- }
-
- // If we get here, number starts before the decimal point, and ends after it,
- // as such is of the form:
- // [<sign>]<significand-begin>.<significand-end>
- if (m_sign)
- ++length;
- length += digitsBeforeDecimalPoint;
- ++length; // for decimal point
- length += m_precision - digitsBeforeDecimalPoint;
-
- return length;
-}
-
-unsigned DecimalNumber::bufferLengthForStringExponential() const
-{
- unsigned length = 0;
- if (m_sign)
- ++length;
-
- // Add the significand
- ++length;
-
- if (m_precision > 1) {
- ++length; // for decimal point
- length += m_precision - 1;
- }
-
- // Add "e+" or "e-"
- length += 2;
-
- int exponent = (m_exponent >= 0) ? m_exponent : -m_exponent;
-
- // Add the exponent
- if (exponent >= 100)
- ++length;
- if (exponent >= 10)
- ++length;
- ++length;
-
- return length;
-}
-
-unsigned DecimalNumber::toStringDecimal(UChar* buffer, unsigned bufferLength) const
-{
- ASSERT_UNUSED(bufferLength, bufferLength >= bufferLengthForStringDecimal());
-
- // Should always be at least one digit to add to the string!
- ASSERT(m_precision);
- UChar* next = buffer;
-
- // if the exponent is negative the number decimal representation is of the form:
- // [<sign>]0.[<zeros>]<significand>
- if (m_exponent < 0) {
- unsigned zeros = -m_exponent - 1;
-
- if (m_sign)
- *next++ = '-';
- *next++ = '0';
- *next++ = '.';
- for (unsigned i = 0; i < zeros; ++i)
- *next++ = '0';
- for (unsigned i = 0; i < m_precision; ++i)
- *next++ = m_significand[i];
-
- return next - buffer;
- }
-
- unsigned digitsBeforeDecimalPoint = m_exponent + 1;
-
- // If the precision is <= than the number of digits to get up to the decimal
- // point, then there is no fractional part, number is of the form:
- // [<sign>]<significand>[<zeros>]
- if (m_precision <= digitsBeforeDecimalPoint) {
- if (m_sign)
- *next++ = '-';
- for (unsigned i = 0; i < m_precision; ++i)
- *next++ = m_significand[i];
- for (unsigned i = 0; i < (digitsBeforeDecimalPoint - m_precision); ++i)
- *next++ = '0';
-
- return next - buffer;
- }
-
- // If we get here, number starts before the decimal point, and ends after it,
- // as such is of the form:
- // [<sign>]<significand-begin>.<significand-end>
-
- if (m_sign)
- *next++ = '-';
- for (unsigned i = 0; i < digitsBeforeDecimalPoint; ++i)
- *next++ = m_significand[i];
- *next++ = '.';
- for (unsigned i = digitsBeforeDecimalPoint; i < m_precision; ++i)
- *next++ = m_significand[i];
-
- return next - buffer;
-}
-
-unsigned DecimalNumber::toStringExponential(UChar* buffer, unsigned bufferLength) const
-{
- ASSERT_UNUSED(bufferLength, bufferLength >= bufferLengthForStringExponential());
-
- // Should always be at least one digit to add to the string!
- ASSERT(m_precision);
- UChar* next = buffer;
-
- // Add the sign
- if (m_sign)
- *next++ = '-';
-
- // Add the significand
- *next++ = m_significand[0];
- if (m_precision > 1) {
- *next++ = '.';
- for (unsigned i = 1; i < m_precision; ++i)
- *next++ = m_significand[i];
- }
-
- // Add "e+" or "e-"
- *next++ = 'e';
- int exponent;
- if (m_exponent >= 0) {
- *next++ = '+';
- exponent = m_exponent;
- } else {
- *next++ = '-';
- exponent = -m_exponent;
- }
-
- // Add the exponent
- if (exponent >= 100)
- *next++ = '0' + exponent / 100;
- if (exponent >= 10)
- *next++ = '0' + (exponent % 100) / 10;
- *next++ = '0' + exponent % 10;
-
- return next - buffer;
-}
-
-} // namespace WTF
projects / apple / javascriptcore.git / blobdiff