| /* |
| * Copyright (c) 2010, 2013, 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. |
| */ |
| |
| package jdk.nashorn.internal.objects; |
| |
| import static jdk.nashorn.internal.lookup.Lookup.MH; |
| import static jdk.nashorn.internal.runtime.ECMAErrors.rangeError; |
| import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; |
| import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.math.RoundingMode; |
| import java.text.NumberFormat; |
| import java.util.Locale; |
| import jdk.internal.dynalink.linker.GuardedInvocation; |
| import jdk.internal.dynalink.linker.LinkRequest; |
| import jdk.nashorn.internal.objects.annotations.Attribute; |
| import jdk.nashorn.internal.objects.annotations.Constructor; |
| import jdk.nashorn.internal.objects.annotations.Function; |
| import jdk.nashorn.internal.objects.annotations.Property; |
| import jdk.nashorn.internal.objects.annotations.ScriptClass; |
| import jdk.nashorn.internal.objects.annotations.SpecializedFunction; |
| import jdk.nashorn.internal.objects.annotations.Where; |
| import jdk.nashorn.internal.runtime.JSType; |
| import jdk.nashorn.internal.runtime.PropertyMap; |
| import jdk.nashorn.internal.runtime.ScriptObject; |
| import jdk.nashorn.internal.runtime.ScriptRuntime; |
| import jdk.nashorn.internal.runtime.linker.NashornGuards; |
| import jdk.nashorn.internal.runtime.linker.PrimitiveLookup; |
| |
| /** |
| * ECMA 15.7 Number Objects. |
| * |
| */ |
| @ScriptClass("Number") |
| public final class NativeNumber extends ScriptObject { |
| |
| /** Method handle to create an object wrapper for a primitive number. */ |
| static final MethodHandle WRAPFILTER = findOwnMH("wrapFilter", MH.type(NativeNumber.class, Object.class)); |
| /** Method handle to retrieve the Number prototype object. */ |
| private static final MethodHandle PROTOFILTER = findOwnMH("protoFilter", MH.type(Object.class, Object.class)); |
| |
| /** ECMA 15.7.3.2 largest positive finite value */ |
| @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT, where = Where.CONSTRUCTOR) |
| public static final double MAX_VALUE = Double.MAX_VALUE; |
| |
| /** ECMA 15.7.3.3 smallest positive finite value */ |
| @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT, where = Where.CONSTRUCTOR) |
| public static final double MIN_VALUE = Double.MIN_VALUE; |
| |
| /** ECMA 15.7.3.4 NaN */ |
| @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT, where = Where.CONSTRUCTOR) |
| public static final double NaN = Double.NaN; |
| |
| /** ECMA 15.7.3.5 negative infinity */ |
| @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT, where = Where.CONSTRUCTOR) |
| public static final double NEGATIVE_INFINITY = Double.NEGATIVE_INFINITY; |
| |
| /** ECMA 15.7.3.5 positive infinity */ |
| @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT, where = Where.CONSTRUCTOR) |
| public static final double POSITIVE_INFINITY = Double.POSITIVE_INFINITY; |
| |
| private final double value; |
| |
| // initialized by nasgen |
| private static PropertyMap $nasgenmap$; |
| |
| private NativeNumber(final double value, final ScriptObject proto, final PropertyMap map) { |
| super(proto, map); |
| this.value = value; |
| } |
| |
| NativeNumber(final double value, final Global global) { |
| this(value, global.getNumberPrototype(), $nasgenmap$); |
| } |
| |
| private NativeNumber(final double value) { |
| this(value, Global.instance()); |
| } |
| |
| |
| @Override |
| public String safeToString() { |
| return "[Number " + toString() + "]"; |
| } |
| |
| @Override |
| public String toString() { |
| return Double.toString(getValue()); |
| } |
| |
| /** |
| * Get the value of this Number |
| * @return a {@code double} representing the Number value |
| */ |
| public double getValue() { |
| return doubleValue(); |
| } |
| |
| /** |
| * Get the value of this Number |
| * @return a {@code double} representing the Number value |
| */ |
| public double doubleValue() { |
| return value; |
| } |
| |
| @Override |
| public String getClassName() { |
| return "Number"; |
| } |
| |
| /** |
| * ECMA 15.7.2 - The Number constructor |
| * |
| * @param newObj is this Number instantiated with the new operator |
| * @param self self reference |
| * @param args value of number |
| * @return the Number instance (internally represented as a {@code NativeNumber}) |
| */ |
| @Constructor(arity = 1) |
| public static Object constructor(final boolean newObj, final Object self, final Object... args) { |
| final double num = (args.length > 0) ? JSType.toNumber(args[0]) : 0.0; |
| |
| return newObj? new NativeNumber(num) : num; |
| } |
| |
| /** |
| * ECMA 15.7.4.5 Number.prototype.toFixed (fractionDigits) |
| * |
| * @param self self reference |
| * @param fractionDigits how many digits should be after the decimal point, 0 if undefined |
| * |
| * @return number in decimal fixed point notation |
| */ |
| @Function(attributes = Attribute.NOT_ENUMERABLE) |
| public static String toFixed(final Object self, final Object fractionDigits) { |
| return toFixed(self, JSType.toInteger(fractionDigits)); |
| } |
| |
| /** |
| * ECMA 15.7.4.5 Number.prototype.toFixed (fractionDigits) specialized for int fractionDigits |
| * |
| * @param self self reference |
| * @param fractionDigits how many digits should be after the decimal point, 0 if undefined |
| * |
| * @return number in decimal fixed point notation |
| */ |
| @SpecializedFunction |
| public static String toFixed(final Object self, final int fractionDigits) { |
| if (fractionDigits < 0 || fractionDigits > 20) { |
| throw rangeError("invalid.fraction.digits", "toFixed"); |
| } |
| |
| final double x = getNumberValue(self); |
| if (Double.isNaN(x)) { |
| return "NaN"; |
| } |
| |
| if (Math.abs(x) >= 1e21) { |
| return JSType.toString(x); |
| } |
| |
| final NumberFormat format = NumberFormat.getNumberInstance(Locale.US); |
| format.setMinimumFractionDigits(fractionDigits); |
| format.setMaximumFractionDigits(fractionDigits); |
| format.setGroupingUsed(false); |
| format.setRoundingMode(RoundingMode.HALF_UP); |
| |
| return format.format(x); |
| } |
| |
| /** |
| * ECMA 15.7.4.6 Number.prototype.toExponential (fractionDigits) |
| * |
| * @param self self reference |
| * @param fractionDigits how many digital should be after the significand's decimal point. If undefined, use as many as necessary to uniquely specify number. |
| * |
| * @return number in decimal exponential notation |
| */ |
| @Function(attributes = Attribute.NOT_ENUMERABLE) |
| public static String toExponential(final Object self, final Object fractionDigits) { |
| final double x = getNumberValue(self); |
| final boolean trimZeros = fractionDigits == UNDEFINED; |
| final int f = trimZeros ? 16 : JSType.toInteger(fractionDigits); |
| |
| if (Double.isNaN(x)) { |
| return "NaN"; |
| } else if (Double.isInfinite(x)) { |
| return x > 0? "Infinity" : "-Infinity"; |
| } |
| |
| if (fractionDigits != UNDEFINED && (f < 0 || f > 20)) { |
| throw rangeError("invalid.fraction.digits", "toExponential"); |
| } |
| |
| final String res = String.format(Locale.US, "%1." + f + "e", x); |
| return fixExponent(res, trimZeros); |
| } |
| |
| /** |
| * ECMA 15.7.4.7 Number.prototype.toPrecision (precision) |
| * |
| * @param self self reference |
| * @param precision use {@code precision - 1} digits after the significand's decimal point or call {@link JSType#toString} if undefined |
| * |
| * @return number in decimal exponentiation notation or decimal fixed notation depending on {@code precision} |
| */ |
| @Function(attributes = Attribute.NOT_ENUMERABLE) |
| public static String toPrecision(final Object self, final Object precision) { |
| final double x = getNumberValue(self); |
| if (precision == UNDEFINED) { |
| return JSType.toString(x); |
| } |
| return (toPrecision(x, JSType.toInteger(precision))); |
| } |
| |
| /** |
| * ECMA 15.7.4.7 Number.prototype.toPrecision (precision) specialized f |
| * |
| * @param self self reference |
| * @param precision use {@code precision - 1} digits after the significand's decimal point. |
| * |
| * @return number in decimal exponentiation notation or decimal fixed notation depending on {@code precision} |
| */ |
| @SpecializedFunction |
| public static String toPrecision(final Object self, final int precision) { |
| return toPrecision(getNumberValue(self), precision); |
| } |
| |
| private static String toPrecision(final double x, final int p) { |
| if (Double.isNaN(x)) { |
| return "NaN"; |
| } else if (Double.isInfinite(x)) { |
| return x > 0? "Infinity" : "-Infinity"; |
| } |
| |
| if (p < 1 || p > 21) { |
| throw rangeError("invalid.precision"); |
| } |
| |
| // workaround for http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6469160 |
| if (x == 0.0 && p <= 1) { |
| return "0"; |
| } |
| |
| return fixExponent(String.format(Locale.US, "%." + p + "g", x), false); |
| } |
| |
| /** |
| * ECMA 15.7.4.2 Number.prototype.toString ( [ radix ] ) |
| * |
| * @param self self reference |
| * @param radix radix to use for string conversion |
| * @return string representation of this Number in the given radix |
| */ |
| @Function(attributes = Attribute.NOT_ENUMERABLE) |
| public static String toString(final Object self, final Object radix) { |
| if (radix != UNDEFINED) { |
| final int intRadix = JSType.toInteger(radix); |
| if (intRadix != 10) { |
| if (intRadix < 2 || intRadix > 36) { |
| throw rangeError("invalid.radix"); |
| } |
| return JSType.toString(getNumberValue(self), intRadix); |
| } |
| } |
| |
| return JSType.toString(getNumberValue(self)); |
| } |
| |
| /** |
| * ECMA 15.7.4.3 Number.prototype.toLocaleString() |
| * |
| * @param self self reference |
| * @return localized string for this Number |
| */ |
| @Function(attributes = Attribute.NOT_ENUMERABLE) |
| public static String toLocaleString(final Object self) { |
| return JSType.toString(getNumberValue(self)); |
| } |
| |
| |
| /** |
| * ECMA 15.7.4.4 Number.prototype.valueOf ( ) |
| * |
| * @param self self reference |
| * @return number value for this Number |
| */ |
| @Function(attributes = Attribute.NOT_ENUMERABLE) |
| public static double valueOf(final Object self) { |
| return getNumberValue(self); |
| } |
| |
| /** |
| * Lookup the appropriate method for an invoke dynamic call. |
| * @param request The link request |
| * @param receiver receiver of call |
| * @return Link to be invoked at call site. |
| */ |
| public static GuardedInvocation lookupPrimitive(final LinkRequest request, final Object receiver) { |
| return PrimitiveLookup.lookupPrimitive(request, NashornGuards.getNumberGuard(), new NativeNumber(((Number)receiver).doubleValue()), WRAPFILTER, PROTOFILTER); |
| } |
| |
| @SuppressWarnings("unused") |
| private static NativeNumber wrapFilter(final Object receiver) { |
| return new NativeNumber(((Number)receiver).doubleValue()); |
| } |
| |
| @SuppressWarnings("unused") |
| private static Object protoFilter(final Object object) { |
| return Global.instance().getNumberPrototype(); |
| } |
| |
| private static double getNumberValue(final Object self) { |
| if (self instanceof Number) { |
| return ((Number)self).doubleValue(); |
| } else if (self instanceof NativeNumber) { |
| return ((NativeNumber)self).getValue(); |
| } else if (self != null && self == Global.instance().getNumberPrototype()) { |
| return 0.0; |
| } else { |
| throw typeError("not.a.number", ScriptRuntime.safeToString(self)); |
| } |
| } |
| |
| // Exponent of Java "e" or "E" formatter is always 2 digits and zero |
| // padded if needed (e+01, e+00, e+12 etc.) JS expects exponent to contain |
| // exact number of digits e+1, e+0, e+12 etc. Fix the exponent here. |
| // |
| // Additionally, if trimZeros is true, this cuts trailing zeros in the |
| // fraction part for calls to toExponential() with undefined fractionDigits |
| // argument. |
| private static String fixExponent(final String str, final boolean trimZeros) { |
| final int index = str.indexOf('e'); |
| if (index < 1) { |
| // no exponent, do nothing.. |
| return str; |
| } |
| |
| // check if character after e+ or e- is 0 |
| final int expPadding = str.charAt(index + 2) == '0' ? 3 : 2; |
| // check if there are any trailing zeroes we should remove |
| |
| int fractionOffset = index; |
| if (trimZeros) { |
| assert fractionOffset > 0; |
| char c = str.charAt(fractionOffset - 1); |
| while (fractionOffset > 1 && (c == '0' || c == '.')) { |
| c = str.charAt(--fractionOffset - 1); |
| } |
| |
| } |
| // if anything needs to be done compose a new string |
| if (fractionOffset < index || expPadding == 3) { |
| return str.substring(0, fractionOffset) |
| + str.substring(index, index + 2) |
| + str.substring(index + expPadding); |
| } |
| return str; |
| } |
| |
| private static MethodHandle findOwnMH(final String name, final MethodType type) { |
| return MH.findStatic(MethodHandles.lookup(), NativeNumber.class, name, type); |
| } |
| } |
