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LibJS: Add spec comments to Value::to_number()
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1 changed files with 24 additions and 10 deletions
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@ -661,25 +661,39 @@ Optional<Value> string_to_number(StringView string)
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ThrowCompletionOr<Value> Value::to_number(VM& vm) const
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{
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VERIFY(!is_empty());
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// 1. If argument is a Number, return argument.
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if (is_number())
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return *this;
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switch (m_value.tag) {
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case UNDEFINED_TAG:
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return js_nan();
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case NULL_TAG:
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return Value(0);
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case BOOLEAN_TAG:
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return Value(as_bool() ? 1 : 0);
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case STRING_TAG:
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return string_to_number(as_string().deprecated_string().view());
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// 2. If argument is either a Symbol or a BigInt, throw a TypeError exception.
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case SYMBOL_TAG:
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return vm.throw_completion<TypeError>(ErrorType::Convert, "symbol", "number");
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case BIGINT_TAG:
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return vm.throw_completion<TypeError>(ErrorType::Convert, "BigInt", "number");
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// 3. If argument is undefined, return NaN.
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case UNDEFINED_TAG:
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return js_nan();
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// 4. If argument is either null or false, return +0𝔽.
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case NULL_TAG:
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return Value(0);
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// 5. If argument is true, return 1𝔽.
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case BOOLEAN_TAG:
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return Value(as_bool() ? 1 : 0);
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// 6. If argument is a String, return StringToNumber(argument).
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case STRING_TAG:
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return string_to_number(as_string().deprecated_string().view());
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// 7. Assert: argument is an Object.
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case OBJECT_TAG: {
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auto primitive = TRY(to_primitive(vm, PreferredType::Number));
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return primitive.to_number(vm);
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// 8. Let primValue be ? ToPrimitive(argument, number).
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auto primitive_value = TRY(to_primitive(vm, PreferredType::Number));
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// 9. Assert: primValue is not an Object.
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VERIFY(!primitive_value.is_object());
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// 10. Return ? ToNumber(primValue).
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return primitive_value.to_number(vm);
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}
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default:
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VERIFY_NOT_REACHED();
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