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org.mozilla.javascript.NativeNumber Maven / Gradle / Ivy
/* -*- 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;
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);
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);
addIdFunctionProperty(ctor, NUMBER_TAG, ConstructorId_parseFloat, "parseFloat", 1);
addIdFunctionProperty(ctor, NUMBER_TAG, ConstructorId_parseInt, "parseInt", 1);
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.toNumber(args[0]) : 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
if (!(thisObj instanceof NativeNumber))
throw incompatibleCallError(f);
double value = ((NativeNumber)thisObj).doubleValue;
switch (id) {
case Id_toString:
case Id_toLocaleString:
{
// toLocaleString is just an alias for toString for now
int base = (args.length == 0 || args[0] == Undefined.instance)
? 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:
return num_to(value, args, DToA.DTOSTR_FIXED,
DToA.DTOSTR_FIXED, -20, 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 || args[0] == Undefined.instance) {
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 Object execConstructorCall(int id, Object[] args)
{
switch (id) {
case ConstructorId_isFinite:
if ((args.length == 0) || (Undefined.instance == args[0])) {
return false;
}
if (args[0] instanceof Number) {
// Match ES6 polyfill, which only works for "number" types
return isFinite(args[0]);
}
return false;
case ConstructorId_isNaN:
if ((args.length == 0) || (Undefined.instance == args[0])) {
return false;
}
if (args[0] instanceof Number) {
return isNaN((Number)args[0]);
}
return false;
case ConstructorId_isInteger:
if ((args.length == 0) || (Undefined.instance == args[0])) {
return false;
}
if (args[0] instanceof Number) {
return isInteger((Number)args[0]);
}
return false;
case ConstructorId_isSafeInteger:
if ((args.length == 0) || (Undefined.instance == args[0])) {
return false;
}
if (args[0] instanceof Number) {
return isSafeInteger((Number)args[0]);
}
return false;
case ConstructorId_parseFloat:
return NativeGlobal.js_parseFloat(args);
case ConstructorId_parseInt:
return NativeGlobal.js_parseInt(args);
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.getMessage1(
"msg.bad.precision", ScriptRuntime.toString(args[0]));
throw ScriptRuntime.constructError("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 Object isNaN(Number val)
{
Double nd = doubleVal(val);
return ScriptRuntime.toBoolean(isDoubleNan(nd));
}
private boolean isDoubleNan(Double d)
{
return d.isNaN();
}
private boolean isInteger(Number val)
{
Double nd = doubleVal(val);
return ScriptRuntime.toBoolean(isDoubleInteger(nd));
}
private boolean isDoubleInteger(Double d)
{
return (!d.isInfinite() && !d.isNaN() &&
(Math.floor(d.doubleValue()) == d.doubleValue()));
}
private boolean isSafeInteger(Number val)
{
Double nd = doubleVal(val);
return ScriptRuntime.toBoolean(isDoubleSafeInteger(nd));
}
private boolean isDoubleSafeInteger(Double d)
{
return (isDoubleInteger(d) &&
(d.doubleValue() <= MAX_SAFE_INTEGER) &&
(d.doubleValue() >= MIN_SAFE_INTEGER));
}
private Double doubleVal(Number val)
{
if (val instanceof Double) {
return (Double)val;
}
double d = val.doubleValue();
return Double.valueOf(d);
}
// #string_id_map#
@Override
protected int findPrototypeId(String s)
{
int id;
// #generated# Last update: 2007-05-09 08:15:50 EDT
L0: { id = 0; String X = null; int c;
L: switch (s.length()) {
case 7: c=s.charAt(0);
if (c=='t') { X="toFixed";id=Id_toFixed; }
else if (c=='v') { X="valueOf";id=Id_valueOf; }
break L;
case 8: c=s.charAt(3);
if (c=='o') { X="toSource";id=Id_toSource; }
else if (c=='t') { X="toString";id=Id_toString; }
break L;
case 11: c=s.charAt(0);
if (c=='c') { X="constructor";id=Id_constructor; }
else if (c=='t') { X="toPrecision";id=Id_toPrecision; }
break L;
case 13: X="toExponential";id=Id_toExponential; break L;
case 14: X="toLocaleString";id=Id_toLocaleString; break L;
}
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
return id;
}
private static final int
ConstructorId_isFinite = -1,
ConstructorId_isNaN = -2,
ConstructorId_isInteger = -3,
ConstructorId_isSafeInteger = -4,
ConstructorId_parseFloat = -5,
ConstructorId_parseInt = -6,
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;
// #/string_id_map#
private double doubleValue;
}
