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LibJS: Implement abstract equality and inequality

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0xtechnobabble 2020-03-16 00:23:38 +02:00 • committed by Andreas Kling
parent 4d22a142f7
commit dfbaa8e543
6 changed files with 64 additions and 2 deletions
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31
Libraries/LibJS/Value.cpp
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@ -209,7 +209,7 @@ Value typed_eq(Value lhs, Value rhs)
case Value::Type::Number:
return Value(lhs.as_double() == rhs.as_double());
case Value::Type::String:
return Value(lhs.as_string() == rhs.as_string());
return Value(lhs.as_string()->string() == rhs.as_string()->string());
case Value::Type::Boolean:
return Value(lhs.as_bool() == rhs.as_bool());
case Value::Type::Object:
@ -219,6 +219,35 @@ Value typed_eq(Value lhs, Value rhs)
ASSERT_NOT_REACHED();
}
Value eq(Value lhs, Value rhs)
{
if (lhs.type() == rhs.type())
return typed_eq(lhs, rhs);
if ((lhs.is_undefined() || lhs.is_null()) && (rhs.is_undefined() || rhs.is_null()))
return Value(true);
if (lhs.is_object() && rhs.is_boolean())
return eq(lhs.as_object()->to_primitive(), rhs.to_number());
if (lhs.is_boolean() && rhs.is_object())
return eq(lhs.to_number(), rhs.as_object()->to_primitive());
if (lhs.is_object())
return eq(lhs.as_object()->to_primitive(), rhs);
if (rhs.is_object())
return eq(lhs, rhs.as_object()->to_primitive());
if (lhs.is_number() || rhs.is_number())
return Value(lhs.to_number().as_double() == rhs.to_number().as_double());
if ((lhs.is_string() && rhs.is_boolean()) || (lhs.is_string() && rhs.is_boolean()))
return Value(lhs.to_number().as_double() == rhs.to_number().as_double());
return Value(false);
}
const LogStream& operator<<(const LogStream& stream, const Value& value)
{
return stream << value.to_string();