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LibJS: Add spec comments to Value::to_boolean()

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This commit is contained in:
Linus Groh 2022-12-09 23:57:06 +00:00
parent 596b30df5f
commit e3c8e1362f
1 changed files with 9 additions and 5 deletions
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14
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -436,23 +436,27 @@ bool Value::to_boolean() const
}
switch (m_value.tag) {
// 1. If argument is a Boolean, return argument.
case BOOLEAN_TAG:
return as_bool();
// 2. If argument is any of undefined, null, +0𝔽, -0𝔽, NaN, 0ℤ, or the empty String, return false.
case UNDEFINED_TAG:
case NULL_TAG:
return false;
case BOOLEAN_TAG:
return as_bool();
case INT32_TAG:
return as_i32() != 0;
case STRING_TAG:
return !as_string().is_empty();
case SYMBOL_TAG:
return true;
case BIGINT_TAG:
return as_bigint().big_integer() != BIGINT_ZERO;
case OBJECT_TAG:
// B.3.7.1 Changes to ToBoolean, https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot-to-boolean
// B.3.6.1 Changes to ToBoolean, https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot-to-boolean
// 3. If argument is an Object and argument has an [[IsHTMLDDA]] internal slot, return false.
if (as_object().is_htmldda())
return false;
// 4. Return true.
return true;
case SYMBOL_TAG:
return true;
default:
VERIFY_NOT_REACHED();