org.mozilla.javascript.NativeNumber Maven / Gradle / Ivy
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript;
/**
* This class implements the Number native object.
*
* See ECMA 15.7.
*
* @author Norris Boyd
*/
final class NativeNumber extends IdScriptableObject {
private static final long serialVersionUID = 3504516769741512101L;
/** @see https://www.ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer */
public static final double MAX_SAFE_INTEGER = 9007199254740991.0; // Math.pow(2, 53) - 1
private static final Object NUMBER_TAG = "Number";
private static final int MAX_PRECISION = 100;
private static final double MIN_SAFE_INTEGER = -MAX_SAFE_INTEGER;
private static final double EPSILON = 2.220446049250313e-16; // Math.pow(2, -52)
static void init(Scriptable scope, boolean sealed) {
NativeNumber obj = new NativeNumber(0.0);
obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
}
NativeNumber(double number) {
doubleValue = number;
}
@Override
public String getClassName() {
return "Number";
}
@Override
protected void fillConstructorProperties(IdFunctionObject ctor) {
final int attr =
ScriptableObject.DONTENUM | ScriptableObject.PERMANENT | ScriptableObject.READONLY;
ctor.defineProperty("NaN", ScriptRuntime.NaNobj, attr);
ctor.defineProperty(
"POSITIVE_INFINITY", ScriptRuntime.wrapNumber(Double.POSITIVE_INFINITY), attr);
ctor.defineProperty(
"NEGATIVE_INFINITY", ScriptRuntime.wrapNumber(Double.NEGATIVE_INFINITY), attr);
ctor.defineProperty("MAX_VALUE", ScriptRuntime.wrapNumber(Double.MAX_VALUE), attr);
ctor.defineProperty("MIN_VALUE", ScriptRuntime.wrapNumber(Double.MIN_VALUE), attr);
ctor.defineProperty("MAX_SAFE_INTEGER", ScriptRuntime.wrapNumber(MAX_SAFE_INTEGER), attr);
ctor.defineProperty("MIN_SAFE_INTEGER", ScriptRuntime.wrapNumber(MIN_SAFE_INTEGER), attr);
ctor.defineProperty("EPSILON", ScriptRuntime.wrapNumber(EPSILON), attr);
addIdFunctionProperty(ctor, NUMBER_TAG, ConstructorId_isFinite, "isFinite", 1);
addIdFunctionProperty(ctor, NUMBER_TAG, ConstructorId_isNaN, "isNaN", 1);
addIdFunctionProperty(ctor, NUMBER_TAG, ConstructorId_isInteger, "isInteger", 1);
addIdFunctionProperty(ctor, NUMBER_TAG, ConstructorId_isSafeInteger, "isSafeInteger", 1);
Object parseFloat = ScriptRuntime.getTopLevelProp(ctor, "parseFloat");
if (parseFloat instanceof IdFunctionObject) {
((IdFunctionObject) parseFloat).addAsProperty(ctor);
}
Object parseInt = ScriptRuntime.getTopLevelProp(ctor, "parseInt");
if (parseInt instanceof IdFunctionObject) {
((IdFunctionObject) parseInt).addAsProperty(ctor);
}
super.fillConstructorProperties(ctor);
}
@Override
protected void initPrototypeId(int id) {
String s;
int arity;
switch (id) {
case Id_constructor:
arity = 1;
s = "constructor";
break;
case Id_toString:
arity = 1;
s = "toString";
break;
case Id_toLocaleString:
arity = 1;
s = "toLocaleString";
break;
case Id_toSource:
arity = 0;
s = "toSource";
break;
case Id_valueOf:
arity = 0;
s = "valueOf";
break;
case Id_toFixed:
arity = 1;
s = "toFixed";
break;
case Id_toExponential:
arity = 1;
s = "toExponential";
break;
case Id_toPrecision:
arity = 1;
s = "toPrecision";
break;
default:
throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(NUMBER_TAG, id, s, arity);
}
@Override
public Object execIdCall(
IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
if (!f.hasTag(NUMBER_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
if (id == Id_constructor) {
double val = (args.length >= 1) ? ScriptRuntime.toNumeric(args[0]).doubleValue() : 0.0;
if (thisObj == null) {
// new Number(val) creates a new Number object.
return new NativeNumber(val);
}
// Number(val) converts val to a number value.
return ScriptRuntime.wrapNumber(val);
} else if (id < Id_constructor) {
return execConstructorCall(id, args);
}
// The rest of Number.prototype methods require thisObj to be Number
double value = ensureType(thisObj, NativeNumber.class, f).doubleValue;
switch (id) {
case Id_toString:
case Id_toLocaleString:
{
// toLocaleString is just an alias for toString for now
int base =
(args.length == 0 || Undefined.isUndefined(args[0]))
? 10
: ScriptRuntime.toInt32(args[0]);
return ScriptRuntime.numberToString(value, base);
}
case Id_toSource:
return "(new Number(" + ScriptRuntime.toString(value) + "))";
case Id_valueOf:
return ScriptRuntime.wrapNumber(value);
case Id_toFixed:
int precisionMin = cx.version < Context.VERSION_ES6 ? -20 : 0;
return num_to(value, args, DToA.DTOSTR_FIXED, DToA.DTOSTR_FIXED, precisionMin, 0);
case Id_toExponential:
{
// Handle special values before range check
if (Double.isNaN(value)) {
return "NaN";
}
if (Double.isInfinite(value)) {
if (value >= 0) {
return "Infinity";
}
return "-Infinity";
}
// General case
return num_to(
value,
args,
DToA.DTOSTR_STANDARD_EXPONENTIAL,
DToA.DTOSTR_EXPONENTIAL,
0,
1);
}
case Id_toPrecision:
{
// Undefined precision, fall back to ToString()
if (args.length == 0 || Undefined.isUndefined(args[0])) {
return ScriptRuntime.numberToString(value, 10);
}
// Handle special values before range check
if (Double.isNaN(value)) {
return "NaN";
}
if (Double.isInfinite(value)) {
if (value >= 0) {
return "Infinity";
}
return "-Infinity";
}
return num_to(value, args, DToA.DTOSTR_STANDARD, DToA.DTOSTR_PRECISION, 1, 0);
}
default:
throw new IllegalArgumentException(String.valueOf(id));
}
}
private static Object execConstructorCall(int id, Object[] args) {
switch (id) {
case ConstructorId_isFinite:
if ((args.length == 0) || Undefined.isUndefined(args[0])) {
return Boolean.FALSE;
}
if (args[0] instanceof Number) {
// Match ES6 polyfill, which only works for "number" types
return isFinite(args[0]);
}
return Boolean.FALSE;
case ConstructorId_isNaN:
if ((args.length == 0) || Undefined.isUndefined(args[0])) {
return Boolean.FALSE;
}
if (args[0] instanceof Number) {
return isNaN((Number) args[0]);
}
return Boolean.FALSE;
case ConstructorId_isInteger:
if ((args.length == 0) || Undefined.isUndefined(args[0])) {
return Boolean.FALSE;
}
if (args[0] instanceof Number) {
return Boolean.valueOf(isInteger((Number) args[0]));
}
return Boolean.FALSE;
case ConstructorId_isSafeInteger:
if ((args.length == 0) || (Undefined.instance == args[0])) {
return Boolean.FALSE;
}
if (args[0] instanceof Number) {
return Boolean.valueOf(isSafeInteger((Number) args[0]));
}
return Boolean.FALSE;
default:
throw new IllegalArgumentException(String.valueOf(id));
}
}
@Override
public String toString() {
return ScriptRuntime.numberToString(doubleValue, 10);
}
private static String num_to(
double val,
Object[] args,
int zeroArgMode,
int oneArgMode,
int precisionMin,
int precisionOffset) {
int precision;
if (args.length == 0) {
precision = 0;
oneArgMode = zeroArgMode;
} else {
/* We allow a larger range of precision than
ECMA requires; this is permitted by ECMA. */
double p = ScriptRuntime.toInteger(args[0]);
if (p < precisionMin || p > MAX_PRECISION) {
String msg =
ScriptRuntime.getMessageById(
"msg.bad.precision", ScriptRuntime.toString(args[0]));
throw ScriptRuntime.rangeError(msg);
}
precision = ScriptRuntime.toInt32(p);
}
StringBuilder sb = new StringBuilder();
DToA.JS_dtostr(sb, oneArgMode, precision + precisionOffset, val);
return sb.toString();
}
static Object isFinite(Object val) {
double d = ScriptRuntime.toNumber(val);
Double nd = Double.valueOf(d);
return ScriptRuntime.wrapBoolean(!nd.isInfinite() && !nd.isNaN());
}
private static Boolean isNaN(Number val) {
if (val instanceof Double) {
return Boolean.valueOf(((Double) val).isNaN());
}
double d = val.doubleValue();
return Boolean.valueOf(Double.isNaN(d));
}
private static boolean isInteger(Number val) {
if (val instanceof Double) {
return isDoubleInteger((Double) val);
}
return isDoubleInteger(val.doubleValue());
}
private static boolean isDoubleInteger(Double d) {
return !d.isInfinite() && !d.isNaN() && (Math.floor(d.doubleValue()) == d.doubleValue());
}
private static boolean isDoubleInteger(double d) {
return !Double.isInfinite(d) && !Double.isNaN(d) && (Math.floor(d) == d);
}
private static boolean isSafeInteger(Number val) {
if (val instanceof Double) {
return isDoubleSafeInteger((Double) val);
}
return isDoubleSafeInteger(val.doubleValue());
}
private static boolean isDoubleSafeInteger(Double d) {
return isDoubleInteger(d)
&& (d.doubleValue() <= MAX_SAFE_INTEGER)
&& (d.doubleValue() >= MIN_SAFE_INTEGER);
}
private static boolean isDoubleSafeInteger(double d) {
return isDoubleInteger(d) && (d <= MAX_SAFE_INTEGER) && (d >= MIN_SAFE_INTEGER);
}
@Override
protected int findPrototypeId(String s) {
int id;
switch (s) {
case "constructor":
id = Id_constructor;
break;
case "toString":
id = Id_toString;
break;
case "toLocaleString":
id = Id_toLocaleString;
break;
case "toSource":
id = Id_toSource;
break;
case "valueOf":
id = Id_valueOf;
break;
case "toFixed":
id = Id_toFixed;
break;
case "toExponential":
id = Id_toExponential;
break;
case "toPrecision":
id = Id_toPrecision;
break;
default:
id = 0;
break;
}
return id;
}
private static final int ConstructorId_isFinite = -1,
ConstructorId_isNaN = -2,
ConstructorId_isInteger = -3,
ConstructorId_isSafeInteger = -4,
Id_constructor = 1,
Id_toString = 2,
Id_toLocaleString = 3,
Id_toSource = 4,
Id_valueOf = 5,
Id_toFixed = 6,
Id_toExponential = 7,
Id_toPrecision = 8,
MAX_PROTOTYPE_ID = 8;
private double doubleValue;
}