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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically
embedded into Java applications to provide scripting to end users.
/* -*- Mode: java; tab-width: 4; indent-tabs-mode: 1; 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 Math native object.
* See ECMA 15.8.
* @author Norris Boyd
*/
final class NativeMath extends IdScriptableObject
{
private static final long serialVersionUID = -8838847185801131569L;
private static final Object MATH_TAG = "Math";
private static final double LOG2E = 1.4426950408889634;
private static final Double Double32 = Double.valueOf(32d);
static void init(Scriptable scope, boolean sealed)
{
NativeMath obj = new NativeMath();
obj.activatePrototypeMap(MAX_ID);
obj.setPrototype(getObjectPrototype(scope));
obj.setParentScope(scope);
if (sealed) { obj.sealObject(); }
ScriptableObject.defineProperty(scope, "Math", obj,
ScriptableObject.DONTENUM);
}
private NativeMath()
{
}
@Override
public String getClassName() { return "Math"; }
@Override
protected void initPrototypeId(int id)
{
if (id <= LAST_METHOD_ID) {
String name;
int arity;
switch (id) {
case Id_toSource: arity = 0; name = "toSource"; break;
case Id_abs: arity = 1; name = "abs"; break;
case Id_acos: arity = 1; name = "acos"; break;
case Id_acosh: arity = 1; name = "acosh"; break;
case Id_asin: arity = 1; name = "asin"; break;
case Id_asinh: arity = 1; name = "asinh"; break;
case Id_atan: arity = 1; name = "atan"; break;
case Id_atanh: arity = 1; name = "atanh"; break;
case Id_atan2: arity = 2; name = "atan2"; break;
case Id_cbrt: arity = 1; name = "cbrt"; break;
case Id_ceil: arity = 1; name = "ceil"; break;
case Id_clz32: arity = 1; name = "clz32"; break;
case Id_cos: arity = 1; name = "cos"; break;
case Id_cosh: arity = 1; name = "cosh"; break;
case Id_exp: arity = 1; name = "exp"; break;
case Id_expm1: arity = 1; name = "expm1"; break;
case Id_floor: arity = 1; name = "floor"; break;
case Id_fround: arity = 1; name = "fround"; break;
case Id_hypot: arity = 2; name = "hypot"; break;
case Id_imul: arity = 2; name = "imul"; break;
case Id_log: arity = 1; name = "log"; break;
case Id_log1p: arity = 1; name = "log1p"; break;
case Id_log10: arity = 1; name = "log10"; break;
case Id_log2: arity = 1; name = "log2"; break;
case Id_max: arity = 2; name = "max"; break;
case Id_min: arity = 2; name = "min"; break;
case Id_pow: arity = 2; name = "pow"; break;
case Id_random: arity = 0; name = "random"; break;
case Id_round: arity = 1; name = "round"; break;
case Id_sign: arity = 1; name = "sign"; break;
case Id_sin: arity = 1; name = "sin"; break;
case Id_sinh: arity = 1; name = "sinh"; break;
case Id_sqrt: arity = 1; name = "sqrt"; break;
case Id_tan: arity = 1; name = "tan"; break;
case Id_tanh: arity = 1; name = "tanh"; break;
case Id_trunc: arity = 1; name = "trunc"; break;
default: throw new IllegalStateException(String.valueOf(id));
}
initPrototypeMethod(MATH_TAG, id, name, arity);
} else {
String name;
double x;
switch (id) {
case Id_E: x = Math.E; name = "E"; break;
case Id_PI: x = Math.PI; name = "PI"; break;
case Id_LN10: x = 2.302585092994046; name = "LN10"; break;
case Id_LN2: x = 0.6931471805599453; name = "LN2"; break;
case Id_LOG2E: x = LOG2E; name = "LOG2E"; break;
case Id_LOG10E: x = 0.4342944819032518; name = "LOG10E"; break;
case Id_SQRT1_2: x = 0.7071067811865476; name = "SQRT1_2"; break;
case Id_SQRT2: x = 1.4142135623730951; name = "SQRT2"; break;
default: throw new IllegalStateException(String.valueOf(id));
}
initPrototypeValue(id, name, ScriptRuntime.wrapNumber(x),
DONTENUM | READONLY | PERMANENT);
}
}
@Override
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (!f.hasTag(MATH_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
double x;
int methodId = f.methodId();
switch (methodId) {
case Id_toSource:
return "Math";
case Id_abs:
x = ScriptRuntime.toNumber(args, 0);
// abs(-0.0) should be 0.0, but -0.0 < 0.0 == false
x = (x == 0.0) ? 0.0 : (x < 0.0) ? -x : x;
break;
case Id_acos:
case Id_asin:
x = ScriptRuntime.toNumber(args, 0);
if (!Double.isNaN(x) && -1.0 <= x && x <= 1.0) {
x = (methodId == Id_acos) ? Math.acos(x) : Math.asin(x);
} else {
x = Double.NaN;
}
break;
case Id_acosh:
x = ScriptRuntime.toNumber(args, 0);
if (!Double.isNaN(x)) {
return Double.valueOf(Math.log(x + Math.sqrt(x*x - 1.0)));
}
return ScriptRuntime.NaNobj;
case Id_asinh:
x = ScriptRuntime.toNumber(args, 0);
if (Double.isInfinite(x)) {
return Double.valueOf(x);
}
if (!Double.isNaN(x)) {
if (x == 0) {
if (1 / x > 0) {
return ScriptRuntime.zeroObj;
}
return ScriptRuntime.negativeZeroObj;
}
return Double.valueOf(Math.log(x + Math.sqrt(x*x + 1.0)));
}
return ScriptRuntime.NaNobj;
case Id_atan:
x = ScriptRuntime.toNumber(args, 0);
x = Math.atan(x);
break;
case Id_atanh:
x = ScriptRuntime.toNumber(args, 0);
if (!Double.isNaN(x) && -1.0 <= x && x <= 1.0) {
if (x == 0) {
if (1 / x > 0) {
return ScriptRuntime.zeroObj;
}
return ScriptRuntime.negativeZeroObj;
}
return Double.valueOf(0.5 * Math.log((x + 1.0) / (x - 1.0)));
}
return ScriptRuntime.NaNobj;
case Id_atan2:
x = ScriptRuntime.toNumber(args, 0);
x = Math.atan2(x, ScriptRuntime.toNumber(args, 1));
break;
case Id_cbrt:
x = ScriptRuntime.toNumber(args, 0);
x = Math.cbrt(x);
break;
case Id_ceil:
x = ScriptRuntime.toNumber(args, 0);
x = Math.ceil(x);
break;
case Id_clz32:
x = ScriptRuntime.toNumber(args, 0);
if (x == 0
|| Double.isNaN(x)
|| Double.isInfinite(x)) {
return Double32;
}
long n = ScriptRuntime.toUint32(x);
if (n == 0) {
return Double32;
}
return Double.valueOf(31 - Math.floor(Math.log(n >>> 0) * LOG2E));
case Id_cos:
x = ScriptRuntime.toNumber(args, 0);
x = Double.isInfinite(x) ? Double.NaN : Math.cos(x);
break;
case Id_cosh:
x = ScriptRuntime.toNumber(args, 0);
x = Math.cosh(x);
break;
case Id_hypot:
x = js_hypot(args);
break;
case Id_exp:
x = ScriptRuntime.toNumber(args, 0);
x = (x == Double.POSITIVE_INFINITY) ? x
: (x == Double.NEGATIVE_INFINITY) ? 0.0
: Math.exp(x);
break;
case Id_expm1:
x = ScriptRuntime.toNumber(args, 0);
x = Math.expm1(x);
break;
case Id_floor:
x = ScriptRuntime.toNumber(args, 0);
x = Math.floor(x);
break;
case Id_fround:
x = ScriptRuntime.toNumber(args, 0);
// Rely on Java to truncate down to a "float" here"
x = (float) x;
break;
case Id_imul:
x = js_imul(args);
break;
case Id_log:
x = ScriptRuntime.toNumber(args, 0);
// Java's log(<0) = -Infinity; we need NaN
x = (x < 0) ? Double.NaN : Math.log(x);
break;
case Id_log1p:
x = ScriptRuntime.toNumber(args, 0);
x = Math.log1p(x);
break;
case Id_log10:
x = ScriptRuntime.toNumber(args, 0);
x = Math.log10(x);
break;
case Id_log2:
x = ScriptRuntime.toNumber(args, 0);
// Java's log(<0) = -Infinity; we need NaN
x = (x < 0) ? Double.NaN : Math.log(x) * LOG2E;
break;
case Id_max:
case Id_min:
x = (methodId == Id_max)
? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
for (int i = 0; i != args.length; ++i) {
double d = ScriptRuntime.toNumber(args[i]);
if (Double.isNaN(d)) {
x = d; // NaN
break;
}
if (methodId == Id_max) {
// if (x < d) x = d; does not work due to -0.0 >= +0.0
x = Math.max(x, d);
} else {
x = Math.min(x, d);
}
}
break;
case Id_pow:
x = ScriptRuntime.toNumber(args, 0);
x = js_pow(x, ScriptRuntime.toNumber(args, 1));
break;
case Id_random:
x = Math.random();
break;
case Id_round:
x = ScriptRuntime.toNumber(args, 0);
if (!Double.isNaN(x) && !Double.isInfinite(x))
{
// Round only finite x
long l = Math.round(x);
if (l != 0) {
x = l;
} else {
// We must propagate the sign of d into the result
if (x < 0.0) {
x = ScriptRuntime.negativeZero;
} else if (x != 0.0) {
x = 0.0;
}
}
}
break;
case Id_sign:
x = ScriptRuntime.toNumber(args, 0);
if (!Double.isNaN(x)) {
if (x == 0) {
if (1 / x > 0) {
return ScriptRuntime.zeroObj;
}
return ScriptRuntime.negativeZeroObj;
}
return Double.valueOf(Math.signum(x));
}
return ScriptRuntime.NaNobj;
case Id_sin:
x = ScriptRuntime.toNumber(args, 0);
x = Double.isInfinite(x) ? Double.NaN : Math.sin(x);
break;
case Id_sinh:
x = ScriptRuntime.toNumber(args, 0);
x = Math.sinh(x);
break;
case Id_sqrt:
x = ScriptRuntime.toNumber(args, 0);
x = Math.sqrt(x);
break;
case Id_tan:
x = ScriptRuntime.toNumber(args, 0);
x = Math.tan(x);
break;
case Id_tanh:
x = ScriptRuntime.toNumber(args, 0);
x = Math.tanh(x);
break;
case Id_trunc:
x = ScriptRuntime.toNumber(args, 0);
x = js_trunc(x);
break;
default: throw new IllegalStateException(String.valueOf(methodId));
}
return ScriptRuntime.wrapNumber(x);
}
// See Ecma 15.8.2.13
private static double js_pow(double x, double y) {
double result;
if (Double.isNaN(y)) {
// y is NaN, result is always NaN
result = y;
} else if (y == 0) {
// Java's pow(NaN, 0) = NaN; we need 1
result = 1.0;
} else if (x == 0) {
// Many differences from Java's Math.pow
if (1 / x > 0) {
result = (y > 0) ? 0 : Double.POSITIVE_INFINITY;
} else {
// x is -0, need to check if y is an odd integer
long y_long = (long)y;
if (y_long == y && (y_long & 0x1) != 0) {
result = (y > 0) ? -0.0 : Double.NEGATIVE_INFINITY;
} else {
result = (y > 0) ? 0.0 : Double.POSITIVE_INFINITY;
}
}
} else {
result = Math.pow(x, y);
if (Double.isNaN(result)) {
// Check for broken Java implementations that gives NaN
// when they should return something else
if (y == Double.POSITIVE_INFINITY) {
if (x < -1.0 || 1.0 < x) {
result = Double.POSITIVE_INFINITY;
} else if (-1.0 < x && x < 1.0) {
result = 0;
}
} else if (y == Double.NEGATIVE_INFINITY) {
if (x < -1.0 || 1.0 < x) {
result = 0;
} else if (-1.0 < x && x < 1.0) {
result = Double.POSITIVE_INFINITY;
}
} else if (x == Double.POSITIVE_INFINITY) {
result = (y > 0) ? Double.POSITIVE_INFINITY : 0.0;
} else if (x == Double.NEGATIVE_INFINITY) {
long y_long = (long)y;
if (y_long == y && (y_long & 0x1) != 0) {
// y is odd integer
result = (y > 0) ? Double.NEGATIVE_INFINITY : -0.0;
} else {
result = (y > 0) ? Double.POSITIVE_INFINITY : 0.0;
}
}
}
}
return result;
}
// Based on code from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/hypot
private static double js_hypot(Object[] args)
{
if (args == null) {
return 0.0;
}
double y = 0.0;
// Spec and tests say that any "Infinity" result takes precedence.
boolean hasNaN = false;
boolean hasInfinity = false;
for (Object o : args) {
double d = ScriptRuntime.toNumber(o);
if (Double.isNaN(d)) {
hasNaN = true;
} else if (Double.isInfinite(d)) {
hasInfinity = true;
} else {
y += d * d;
}
}
if (hasInfinity) {
return Double.POSITIVE_INFINITY;
}
if (hasNaN) {
return Double.NaN;
}
return Math.sqrt(y);
}
private static double js_trunc(double d)
{
return ((d < 0.0) ? Math.ceil(d) : Math.floor(d));
}
// From EcmaScript 6 section 20.2.2.19
private static int js_imul(Object[] args)
{
if (args == null) {
return 0;
}
int x = ScriptRuntime.toInt32(args, 0);
int y = ScriptRuntime.toInt32(args, 1);
return x * y;
}
// #string_id_map#
@Override
protected int findPrototypeId(String s)
{
int id;
// #generated# Last update: 2018-07-02 19:08:32 MESZ
L0: { id = 0; String X = null; int c;
L: switch (s.length()) {
case 1: if (s.charAt(0)=='E') {id=Id_E; break L0;} break L;
case 2: if (s.charAt(0)=='P' && s.charAt(1)=='I') {id=Id_PI; break L0;} break L;
case 3: switch (s.charAt(0)) {
case 'L': if (s.charAt(2)=='2' && s.charAt(1)=='N') {id=Id_LN2; break L0;} break L;
case 'a': if (s.charAt(2)=='s' && s.charAt(1)=='b') {id=Id_abs; break L0;} break L;
case 'c': if (s.charAt(2)=='s' && s.charAt(1)=='o') {id=Id_cos; break L0;} break L;
case 'e': if (s.charAt(2)=='p' && s.charAt(1)=='x') {id=Id_exp; break L0;} break L;
case 'l': if (s.charAt(2)=='g' && s.charAt(1)=='o') {id=Id_log; break L0;} break L;
case 'm': c=s.charAt(2);
if (c=='n') { if (s.charAt(1)=='i') {id=Id_min; break L0;} }
else if (c=='x') { if (s.charAt(1)=='a') {id=Id_max; break L0;} }
break L;
case 'p': if (s.charAt(2)=='w' && s.charAt(1)=='o') {id=Id_pow; break L0;} break L;
case 's': if (s.charAt(2)=='n' && s.charAt(1)=='i') {id=Id_sin; break L0;} break L;
case 't': if (s.charAt(2)=='n' && s.charAt(1)=='a') {id=Id_tan; break L0;} break L;
} break L;
case 4: switch (s.charAt(1)) {
case 'N': X="LN10";id=Id_LN10; break L;
case 'a': X="tanh";id=Id_tanh; break L;
case 'b': X="cbrt";id=Id_cbrt; break L;
case 'c': X="acos";id=Id_acos; break L;
case 'e': X="ceil";id=Id_ceil; break L;
case 'i': c=s.charAt(3);
if (c=='h') { if (s.charAt(0)=='s' && s.charAt(2)=='n') {id=Id_sinh; break L0;} }
else if (c=='n') { if (s.charAt(0)=='s' && s.charAt(2)=='g') {id=Id_sign; break L0;} }
break L;
case 'm': X="imul";id=Id_imul; break L;
case 'o': c=s.charAt(0);
if (c=='c') { if (s.charAt(2)=='s' && s.charAt(3)=='h') {id=Id_cosh; break L0;} }
else if (c=='l') { if (s.charAt(2)=='g' && s.charAt(3)=='2') {id=Id_log2; break L0;} }
break L;
case 'q': X="sqrt";id=Id_sqrt; break L;
case 's': X="asin";id=Id_asin; break L;
case 't': X="atan";id=Id_atan; break L;
} break L;
case 5: switch (s.charAt(0)) {
case 'L': X="LOG2E";id=Id_LOG2E; break L;
case 'S': X="SQRT2";id=Id_SQRT2; break L;
case 'a': c=s.charAt(1);
if (c=='c') { X="acosh";id=Id_acosh; }
else if (c=='s') { X="asinh";id=Id_asinh; }
else if (c=='t') {
c=s.charAt(4);
if (c=='2') { if (s.charAt(2)=='a' && s.charAt(3)=='n') {id=Id_atan2; break L0;} }
else if (c=='h') { if (s.charAt(2)=='a' && s.charAt(3)=='n') {id=Id_atanh; break L0;} }
}
break L;
case 'c': X="clz32";id=Id_clz32; break L;
case 'e': X="expm1";id=Id_expm1; break L;
case 'f': X="floor";id=Id_floor; break L;
case 'h': X="hypot";id=Id_hypot; break L;
case 'l': c=s.charAt(4);
if (c=='0') { X="log10";id=Id_log10; }
else if (c=='p') { X="log1p";id=Id_log1p; }
break L;
case 'r': X="round";id=Id_round; break L;
case 't': X="trunc";id=Id_trunc; break L;
} break L;
case 6: c=s.charAt(0);
if (c=='L') { X="LOG10E";id=Id_LOG10E; }
else if (c=='f') { X="fround";id=Id_fround; }
else if (c=='r') { X="random";id=Id_random; }
break L;
case 7: X="SQRT1_2";id=Id_SQRT1_2; break L;
case 8: X="toSource";id=Id_toSource; break L;
}
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
return id;
}
private static final int
Id_toSource = 1,
Id_abs = 2,
Id_acos = 3,
Id_asin = 4,
Id_atan = 5,
Id_atan2 = 6,
Id_ceil = 7,
Id_cos = 8,
Id_exp = 9,
Id_floor = 10,
Id_log = 11,
Id_max = 12,
Id_min = 13,
Id_pow = 14,
Id_random = 15,
Id_round = 16,
Id_sin = 17,
Id_sqrt = 18,
Id_tan = 19,
Id_cbrt = 20,
Id_cosh = 21,
Id_expm1 = 22,
Id_hypot = 23,
Id_log1p = 24,
Id_log10 = 25,
Id_sinh = 26,
Id_tanh = 27,
Id_imul = 28,
Id_trunc = 29,
Id_acosh = 30,
Id_asinh = 31,
Id_atanh = 32,
Id_sign = 33,
Id_log2 = 34,
Id_fround = 35,
Id_clz32 = 36,
LAST_METHOD_ID = Id_clz32;
/* Missing from ES6:
clz32
fround
log2
*/
private static final int
Id_E = LAST_METHOD_ID + 1,
Id_PI = LAST_METHOD_ID + 2,
Id_LN10 = LAST_METHOD_ID + 3,
Id_LN2 = LAST_METHOD_ID + 4,
Id_LOG2E = LAST_METHOD_ID + 5,
Id_LOG10E = LAST_METHOD_ID + 6,
Id_SQRT1_2 = LAST_METHOD_ID + 7,
Id_SQRT2 = LAST_METHOD_ID + 8,
MAX_ID = LAST_METHOD_ID + 8;
// #/string_id_map#
}
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