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Serenity Operating System
1/*
2 * Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <LibJS/Interpreter.h>
28#include <LibJS/Runtime/Error.h>
29#include <LibJS/Runtime/NumberConstructor.h>
30#include <LibJS/Runtime/NumberObject.h>
31#include <math.h>
32
33#define EPSILON pow(2, -52)
34#define MAX_SAFE_INTEGER pow(2, 53) - 1
35#define MIN_SAFE_INTEGER -(pow(2, 53) - 1)
36
37namespace JS {
38
39NumberConstructor::NumberConstructor()
40{
41 put_native_function("isSafeInteger", is_safe_integer, 1);
42
43 put("prototype", interpreter().number_prototype());
44 put("length", Value(1));
45 put("EPSILON", Value(EPSILON));
46 put("MAX_SAFE_INTEGER", Value(MAX_SAFE_INTEGER));
47 put("MIN_SAFE_INTEGER", Value(MIN_SAFE_INTEGER));
48 put("NEGATIVE_INFINITY", Value(-js_infinity().as_double()));
49 put("POSITIVE_INFINITY", js_infinity());
50 put("NaN", js_nan());
51}
52
53NumberConstructor::~NumberConstructor()
54{
55}
56
57Value NumberConstructor::call(Interpreter& interpreter)
58{
59 if (!interpreter.argument_count())
60 return Value(0);
61 return interpreter.argument(0).to_number();
62}
63
64Value NumberConstructor::construct(Interpreter& interpreter)
65{
66 double number;
67 if (!interpreter.argument_count())
68 number = 0;
69 else
70 number = interpreter.argument(0).to_number().as_double();
71 return Value(interpreter.heap().allocate<NumberObject>(number));
72}
73
74Value NumberConstructor::is_safe_integer(Interpreter& interpreter)
75{
76 if (!interpreter.argument(0).is_number())
77 return Value(false);
78 auto value = interpreter.argument(0).to_number().as_double();
79 return Value((int64_t)value == value && value >= MIN_SAFE_INTEGER && value <= MAX_SAFE_INTEGER);
80}
81
82}