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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 (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;
}
@Override
protected int findPrototypeId(String s) {
int id;
switch (s) {
case "toSource":
id = Id_toSource;
break;
case "abs":
id = Id_abs;
break;
case "acos":
id = Id_acos;
break;
case "asin":
id = Id_asin;
break;
case "atan":
id = Id_atan;
break;
case "atan2":
id = Id_atan2;
break;
case "ceil":
id = Id_ceil;
break;
case "cos":
id = Id_cos;
break;
case "exp":
id = Id_exp;
break;
case "floor":
id = Id_floor;
break;
case "log":
id = Id_log;
break;
case "max":
id = Id_max;
break;
case "min":
id = Id_min;
break;
case "pow":
id = Id_pow;
break;
case "random":
id = Id_random;
break;
case "round":
id = Id_round;
break;
case "sin":
id = Id_sin;
break;
case "sqrt":
id = Id_sqrt;
break;
case "tan":
id = Id_tan;
break;
case "cbrt":
id = Id_cbrt;
break;
case "cosh":
id = Id_cosh;
break;
case "expm1":
id = Id_expm1;
break;
case "hypot":
id = Id_hypot;
break;
case "log1p":
id = Id_log1p;
break;
case "log10":
id = Id_log10;
break;
case "sinh":
id = Id_sinh;
break;
case "tanh":
id = Id_tanh;
break;
case "imul":
id = Id_imul;
break;
case "trunc":
id = Id_trunc;
break;
case "acosh":
id = Id_acosh;
break;
case "asinh":
id = Id_asinh;
break;
case "atanh":
id = Id_atanh;
break;
case "sign":
id = Id_sign;
break;
case "log2":
id = Id_log2;
break;
case "fround":
id = Id_fround;
break;
case "clz32":
id = Id_clz32;
break;
case "E":
id = Id_E;
break;
case "PI":
id = Id_PI;
break;
case "LN10":
id = Id_LN10;
break;
case "LN2":
id = Id_LN2;
break;
case "LOG2E":
id = Id_LOG2E;
break;
case "LOG10E":
id = Id_LOG10E;
break;
case "SQRT1_2":
id = Id_SQRT1_2;
break;
case "SQRT2":
id = Id_SQRT2;
break;
default:
id = 0;
break;
}
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;
}
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