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LibJS: Add the Number.prototype.toFixed method
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5 changed files with 79 additions and 0 deletions
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@ -297,6 +297,7 @@ namespace JS {
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P(test) \
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P(then) \
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P(toDateString) \
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P(toFixed) \
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P(toGMTString) \
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P(toISOString) \
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P(toJSON) \
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@ -32,6 +32,7 @@
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M(InstanceOfOperatorBadPrototype, "'prototype' property of {} is not an object") \
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M(InvalidAssignToConst, "Invalid assignment to const variable") \
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M(InvalidCodePoint, "Invalid code point {}, must be an integer no less than 0 and no greater than 0x10FFFF") \
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M(InvalidFractionDigits, "Fraction Digits must be an integer no less than 0, and no greater than 100") \
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M(InvalidHint, "Invalid hint: \"{}\"") \
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M(InvalidIndex, "Index must be a positive integer") \
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M(InvalidLeftHandAssignment, "Invalid left-hand side in assignment") \
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@ -34,6 +34,7 @@ void NumberPrototype::initialize(GlobalObject& object)
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auto& vm = this->vm();
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Object::initialize(object);
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u8 attr = Attribute::Configurable | Attribute::Writable;
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define_native_function(vm.names.toFixed, to_fixed, 1, attr);
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define_native_function(vm.names.toString, to_string, 1, attr);
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define_native_function(vm.names.valueOf, value_of, 0, attr);
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}
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@ -54,6 +55,37 @@ static Value this_number_value(GlobalObject& global_object, Value value)
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return {};
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}
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// 21.1.3.3 Number.prototype.toFixed ( fractionDigits ), https://tc39.es/ecma262/#sec-number.prototype.tofixed
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JS_DEFINE_NATIVE_FUNCTION(NumberPrototype::to_fixed)
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{
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auto number_value = this_number_value(global_object, vm.this_value(global_object));
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if (vm.exception())
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return {};
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auto fraction_digits = vm.argument(0).to_integer_or_infinity(global_object);
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if (vm.exception())
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return {};
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if (!vm.argument(0).is_finite_number()) {
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vm.throw_exception<RangeError>(global_object, ErrorType::InvalidFractionDigits);
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return {};
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}
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if (fraction_digits < 0 || fraction_digits > 100) {
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vm.throw_exception<RangeError>(global_object, ErrorType::InvalidFractionDigits);
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return {};
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}
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if (!number_value.is_finite_number())
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return js_string(vm, number_value.to_string(global_object));
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auto number = number_value.as_double();
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if (fabs(number) >= 1e+21)
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return js_string(vm, number_value.to_string(global_object));
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return js_string(vm, String::formatted("{:0.{1}}", number, static_cast<size_t>(fraction_digits)));
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}
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// 21.1.3.6 Number.prototype.toString ( [ radix ] ), https://tc39.es/ecma262/#sec-number.prototype.tostring
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JS_DEFINE_NATIVE_FUNCTION(NumberPrototype::to_string)
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{
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@ -18,6 +18,7 @@ public:
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virtual void initialize(GlobalObject&) override;
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virtual ~NumberPrototype() override;
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JS_DECLARE_NATIVE_FUNCTION(to_fixed);
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JS_DECLARE_NATIVE_FUNCTION(to_string);
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JS_DECLARE_NATIVE_FUNCTION(value_of);
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};
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