org.mozilla.javascript.NativeMath Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rhino Show documentation
Show all versions of rhino Show documentation
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.
Full jar including tools, excluding the JSR-223 Script Engine wrapper.
/* -*- 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;
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 (x == 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 (x == x) {
return Math.log(x + Math.sqrt(x*x - 1.0));
}
return Double.NaN;
case Id_asinh:
x = ScriptRuntime.toNumber(args, 0);
if (x == Double.POSITIVE_INFINITY
|| x == Double.NEGATIVE_INFINITY) {
return x;
}
if (x == x) {
if (x == 0) {
if (1 / x > 0) {
return 0.0;
}
return -0.0;
}
return Math.log(x + Math.sqrt(x*x + 1.0));
}
return Double.NaN;
case Id_atan:
x = ScriptRuntime.toNumber(args, 0);
x = Math.atan(x);
break;
case Id_atanh:
x = ScriptRuntime.toNumber(args, 0);
if (x == x && -1.0 <= x && x <= 1.0) {
if (x == 0) {
if (1 / x > 0) {
return 0.0;
}
return -0.0;
}
return 0.5 * Math.log((x + 1.0) / (x - 1.0));
}
return Double.NaN;
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
|| x != x
|| x == Double.POSITIVE_INFINITY
|| x == Double.NEGATIVE_INFINITY) {
return 32;
}
long n = ScriptRuntime.toUint32(x);
if (n == 0) {
return 32;
}
return 31 - Math.floor(Math.log(n >>> 0) * LOG2E);
case Id_cos:
x = ScriptRuntime.toNumber(args, 0);
x = (x == Double.POSITIVE_INFINITY
|| x == Double.NEGATIVE_INFINITY)
? 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);
x = (float) x;
break;
case Id_imul:
return js_imul(args);
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 (d != 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 (x == x && x != Double.POSITIVE_INFINITY
&& x != Double.NEGATIVE_INFINITY)
{
// 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 (x == x) {
if (x == 0) {
if (1 / x > 0) {
return 0.0;
}
return -0.0;
}
return Math.signum(x);
}
return Double.NaN;
case Id_sin:
x = ScriptRuntime.toNumber(args, 0);
x = (x == Double.POSITIVE_INFINITY
|| x == Double.NEGATIVE_INFINITY)
? 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 (y != 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 (result != 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;
for (Object o : args) {
double d = ScriptRuntime.toNumber(o);
if (d == ScriptRuntime.NaN) {
return d;
}
if ((d == Double.POSITIVE_INFINITY) || (d == Double.NEGATIVE_INFINITY)) {
return Double.POSITIVE_INFINITY;
}
y += d * d;
}
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#
}