forked from mozilla/rhino
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathNativeMath.java
More file actions
198 lines (174 loc) · 6.77 KB
/
Copy pathNativeMath.java
File metadata and controls
198 lines (174 loc) · 6.77 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1997-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
package org.mozilla.javascript;
/**
* This class implements the Math native object.
* See ECMA 15.8.
* @author Norris Boyd
*/
public class NativeMath extends ScriptableObject {
public static Scriptable init(Scriptable scope)
throws PropertyException
{
NativeMath m = new NativeMath();
m.setPrototype(getObjectPrototype(scope));
m.setParentScope(scope);
String[] names = { "atan", "atan2", "ceil",
"cos", "floor", "random",
"sin", "sqrt", "tan" };
m.defineFunctionProperties(names, java.lang.Math.class,
ScriptableObject.DONTENUM);
// These functions exist in java.lang.Math, but
// are overloaded. Define our own wrappers.
String[] localNames = { "acos", "asin", "abs", "exp", "max", "min",
"round", "pow", "log" };
m.defineFunctionProperties(localNames, NativeMath.class,
ScriptableObject.DONTENUM);
/*
have to fix up the length property for max & min
which are varargs form, but need to have a length of 2
*/
((FunctionObject)m.get("max", scope)).setLength((short)2);
((FunctionObject)m.get("min", scope)).setLength((short)2);
final int attr = ScriptableObject.DONTENUM |
ScriptableObject.PERMANENT |
ScriptableObject.READONLY;
m.defineProperty("E", new Double(Math.E), attr);
m.defineProperty("PI", new Double(Math.PI), attr);
m.defineProperty("LN10", new Double(2.302585092994046), attr);
m.defineProperty("LN2", new Double(0.6931471805599453), attr);
m.defineProperty("LOG2E", new Double(1.4426950408889634), attr);
m.defineProperty("LOG10E", new Double(0.4342944819032518), attr);
m.defineProperty("SQRT1_2", new Double(0.7071067811865476), attr);
m.defineProperty("SQRT2", new Double(1.4142135623730951), attr);
// We know that scope is a Scriptable object since we
// constrained the type on initStandardObjects.
ScriptableObject global = (ScriptableObject) scope;
global.defineProperty("Math", m, ScriptableObject.DONTENUM);
return m;
}
public NativeMath() {
}
public String getClassName() {
return "Math";
}
public static double abs(double d) {
if (d == 0.0)
return 0.0; // abs(-0.0) should be 0.0, but -0.0 < 0.0 == false
else if (d < 0.0)
return -d;
else
return d;
}
public static double acos(double d) {
if ((d != d)
|| (d > 1.0)
|| (d < -1.0))
return Double.NaN;
return Math.acos(d);
}
public static double asin(double d) {
if ((d != d)
|| (d > 1.0)
|| (d < -1.0))
return Double.NaN;
return Math.asin(d);
}
public static double max(Context cx, Scriptable thisObj,
Object[] args, Function funObj)
{
double result = Double.NEGATIVE_INFINITY;
if (args.length == 0)
return result;
for (int i = 0; i < args.length; i++) {
double d = ScriptRuntime.toNumber(args[i]);
if (d != d) return d;
result = Math.max(result, d);
}
return result;
}
public static double min(Context cx, Scriptable thisObj,
Object[] args, Function funObj)
{
double result = Double.POSITIVE_INFINITY;
if (args.length == 0)
return result;
for (int i = 0; i < args.length; i++) {
double d = ScriptRuntime.toNumber(args[i]);
if (d != d) return d;
result = Math.min(result, d);
}
return result;
}
public static double round(double d) {
if (d != d)
return d; // NaN
if (d == Double.POSITIVE_INFINITY || d == Double.NEGATIVE_INFINITY)
return d;
long l = Math.round(d);
if (l == 0) {
// We must propagate the sign of d into the result
if (d < 0.0)
return ScriptRuntime.negativeZero;
return d == 0.0 ? d : 0.0;
}
return (double) l;
}
public static double pow(double x, double y) {
if (y == 0)
return 1.0; // Java's pow(NaN, 0) = NaN; we need 1
if ((x == 0) && (y < 0)) {
Double d = new Double(x);
if (d.equals(new Double(0))) // x is +0
return Double.POSITIVE_INFINITY; // Java is -Infinity
/* if x is -0 and y is an odd integer, -Infinity */
if (((int)y == y) && (((int)y & 0x1) == 1))
return Double.NEGATIVE_INFINITY;
return Double.POSITIVE_INFINITY;
}
return Math.pow(x, y);
}
public static double exp(double d) {
if (d == Double.POSITIVE_INFINITY)
return d;
if (d == Double.NEGATIVE_INFINITY)
return 0.0;
return Math.exp(d);
}
public static double log(double x) {
if (x < 0)
return Double.NaN; // Java's log(<0) = -Infinity; we need NaN
return Math.log(x);
}
}