--- /dev/null 2015-11-07 10:53:58.443498738 +0100 +++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/doubleconv/DoubleConversion.java 2015-11-09 10:35:37.505341705 +0100 @@ -0,0 +1,214 @@ +/* + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +// This file is available under and governed by the GNU General Public +// License version 2 only, as published by the Free Software Foundation. +// However, the following notice accompanied the original version of this +// file: +// +// Copyright 2011 the V8 project authors. All rights reserved. +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * 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. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT +// OWNER 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. + +package jdk.nashorn.internal.runtime.doubleconv; + +/** + * This class provides the public API for the double conversion package. + */ +public final class DoubleConversion { + + private final static int BUFFER_LENGTH = 30; + + /** + * Converts a double number to its shortest string representation. + * + * @param value number to convert + * @return formatted number + */ + public static String toShortestString(final double value) { + final DtoaBuffer buffer = new DtoaBuffer(FastDtoa.kFastDtoaMaximalLength); + final double absValue = Math.abs(value); + + if (value < 0) { + buffer.isNegative = true; + } + + if (!fastDtoaShortest(absValue, buffer)) { + buffer.reset(); + bignumDtoa(absValue, DtoaMode.SHORTEST, 0, buffer); + } + + return buffer.format(DtoaMode.SHORTEST, 0); + } + + /** + * Converts a double number to a string representation with a fixed number of digits + * after the decimal point. + * + * @param value number to convert. + * @param requestedDigits number of digits after decimal point + * @return formatted number + */ + public static String toFixed(final double value, final int requestedDigits) { + final DtoaBuffer buffer = new DtoaBuffer(BUFFER_LENGTH); + final double absValue = Math.abs(value); + + if (value < 0) { + buffer.isNegative = true; + } + + if (value == 0) { + buffer.append('0'); + buffer.decimalPoint = 1; + } else if (!fixedDtoa(absValue, requestedDigits, buffer)) { + buffer.reset(); + bignumDtoa(absValue, DtoaMode.FIXED, requestedDigits, buffer); + } + + return buffer.format(DtoaMode.FIXED, requestedDigits); + } + + /** + * Converts a double number to a string representation with a fixed number of digits. + * + * @param value number to convert + * @param precision number of digits to create + * @return formatted number + */ + public static String toPrecision(final double value, final int precision) { + final DtoaBuffer buffer = new DtoaBuffer(precision); + final double absValue = Math.abs(value); + + if (value < 0) { + buffer.isNegative = true; + } + + if (value == 0) { + for (int i = 0; i < precision; i++) { + buffer.append('0'); + } + buffer.decimalPoint = 1; + + } else if (!fastDtoaCounted(absValue, precision, buffer)) { + buffer.reset(); + bignumDtoa(absValue, DtoaMode.PRECISION, precision, buffer); + } + + return buffer.format(DtoaMode.PRECISION, 0); + } + + /** + * Converts a double number to a string representation using the + * {@code BignumDtoa} algorithm and the specified conversion mode + * and number of digits. + * + * @param v number to convert + * @param mode conversion mode + * @param digits number of digits + * @param buffer buffer to use + */ + public static void bignumDtoa(final double v, final DtoaMode mode, final int digits, final DtoaBuffer buffer) { + assert(v > 0); + assert(!Double.isNaN(v)); + assert(!Double.isInfinite(v)); + + BignumDtoa.bignumDtoa(v, mode, digits, buffer); + } + + /** + * Converts a double number to its shortest string representation + * using the {@code FastDtoa} algorithm. + * + * @param v number to convert + * @param buffer buffer to use + * @return true if conversion succeeded + */ + public static boolean fastDtoaShortest(final double v, final DtoaBuffer buffer) { + assert(v > 0); + assert(!Double.isNaN(v)); + assert(!Double.isInfinite(v)); + + return FastDtoa.grisu3(v, buffer); + } + + /** + * Converts a double number to a string representation with the + * given number of digits using the {@code FastDtoa} algorithm. + * + * @param v number to convert + * @param precision number of digits to generate + * @param buffer buffer to use + * @return true if conversion succeeded + */ + public static boolean fastDtoaCounted(final double v, final int precision, final DtoaBuffer buffer) { + assert(v > 0); + assert(!Double.isNaN(v)); + assert(!Double.isInfinite(v)); + + return FastDtoa.grisu3Counted(v, precision, buffer); + } + + /** + * Converts a double number to a string representation with a + * fixed number of digits after the decimal point using the + * {@code FixedDtoa} algorithm. + * + * @param v number to convert. + * @param digits number of digits after the decimal point + * @param buffer buffer to use + * @return true if conversion succeeded + */ + public static boolean fixedDtoa(final double v, final int digits, final DtoaBuffer buffer) { + assert(v > 0); + assert(!Double.isNaN(v)); + assert(!Double.isInfinite(v)); + + return FixedDtoa.fastFixedDtoa(v, digits, buffer); + } + +}