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LibJS: Add Number.isSafeInteger()

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This commit is contained in:
Linus Groh 2020-04-07 18:06:44 +01:00 • committed by Andreas Kling
parent b7032b4972
commit 5ecc7e6a1c
3 changed files with 45 additions and 3 deletions
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20
Libraries/LibJS/Runtime/NumberConstructor.cpp
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@ -30,15 +30,21 @@
#include <LibJS/Runtime/NumberObject.h>
#include <math.h>
#define EPSILON pow(2, -52)
#define MAX_SAFE_INTEGER pow(2, 53) - 1
#define MIN_SAFE_INTEGER -(pow(2, 53) - 1)
namespace JS {
NumberConstructor::NumberConstructor()
{
put_native_function("isSafeInteger", is_safe_integer, 1);
put("prototype", interpreter().number_prototype());
put("length", Value(1));
put("EPSILON", Value(pow(2, -52)));
put("MAX_SAFE_INTEGER", Value(pow(2, 53) - 1));
put("MIN_SAFE_INTEGER", Value(-(pow(2, 53) - 1)));
put("EPSILON", Value(EPSILON));
put("MAX_SAFE_INTEGER", Value(MAX_SAFE_INTEGER));
put("MIN_SAFE_INTEGER", Value(MIN_SAFE_INTEGER));
put("NEGATIVE_INFINITY", Value(-js_infinity().as_double()));
put("POSITIVE_INFINITY", js_infinity());
put("NaN", js_nan());
@ -65,4 +71,12 @@ Value NumberConstructor::construct(Interpreter& interpreter)
return Value(interpreter.heap().allocate<NumberObject>(number));
}
Value NumberConstructor::is_safe_integer(Interpreter& interpreter)
{
if (!interpreter.argument(0).is_number())
return Value(false);
auto value = interpreter.argument(0).to_number().as_double();
return Value((int64_t)value == value && value >= MIN_SAFE_INTEGER && value <= MAX_SAFE_INTEGER);
}
}