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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FlyString.h>
#include <LibJS/Runtime/StringOrSymbol.h>
namespace JS {
class PropertyName {
public:
enum class Type : u8 {
Invalid,
Number,
String,
Symbol,
};
enum class StringMayBeNumber {
Yes,
No,
};
static PropertyName from_value(GlobalObject& global_object, Value value)
{
if (value.is_empty())
return {};
if (value.is_symbol())
return value.as_symbol();
if (value.is_integral_number() && value.as_double() >= 0 && value.as_double() < NumericLimits<u32>::max())
return value.as_u32();
auto string = value.to_string(global_object);
if (string.is_null())
return {};
return string;
}
PropertyName() { }
template<Integral T>
PropertyName(T index)
{
// FIXME: Replace this with requires(IsUnsigned<T>)?
// Needs changes in various places using `int` (but not actually being in the negative range)
VERIFY(index >= 0);
if constexpr (NumericLimits<T>::max() >= NumericLimits<u32>::max()) {
if (index >= NumericLimits<u32>::max()) {
m_string = String::number(index);
m_type = Type::String;
m_string_may_be_number = false;
return;
}
}
m_type = Type::Number;
m_number = index;
}
PropertyName(char const* chars)
: m_type(Type::String)
, m_string(FlyString(chars))
{
}
PropertyName(String const& string)
: m_type(Type::String)
, m_string(FlyString(string))
{
VERIFY(!string.is_null());
}
PropertyName(FlyString const& string, StringMayBeNumber string_may_be_number = StringMayBeNumber::Yes)
: m_type(Type::String)
, m_string_may_be_number(string_may_be_number == StringMayBeNumber::Yes)
, m_string(string)
{
VERIFY(!string.is_null());
}
PropertyName(Symbol& symbol)
: m_type(Type::Symbol)
, m_symbol(&symbol)
{
}
PropertyName(StringOrSymbol const& string_or_symbol)
{
if (string_or_symbol.is_string()) {
m_string = string_or_symbol.as_string();
m_type = Type::String;
} else if (string_or_symbol.is_symbol()) {
m_symbol = const_cast<Symbol*>(string_or_symbol.as_symbol());
m_type = Type::Symbol;
}
}
ALWAYS_INLINE Type type() const { return m_type; }
bool is_valid() const { return m_type != Type::Invalid; }
bool is_number() const
{
if (m_type == Type::Number)
return true;
if (m_type != Type::String || !m_string_may_be_number)
return false;
return const_cast<PropertyName*>(this)->try_coerce_into_number();
}
bool is_string() const
{
if (m_type != Type::String)
return false;
if (!m_string_may_be_number)
return true;
return !const_cast<PropertyName*>(this)->try_coerce_into_number();
}
bool is_symbol() const { return m_type == Type::Symbol; }
bool try_coerce_into_number()
{
VERIFY(m_string_may_be_number);
if (m_string.is_empty()) {
m_string_may_be_number = false;
return false;
}
if (char first = m_string.characters()[0]; first < '0' || first > '9') {
m_string_may_be_number = false;
return false;
} else if (m_string.length() > 1 && first == '0') {
m_string_may_be_number = false;
return false;
}
auto property_index = m_string.to_uint(TrimWhitespace::No);
if (!property_index.has_value() || property_index.value() == NumericLimits<u32>::max()) {
m_string_may_be_number = false;
return false;
}
m_type = Type::Number;
m_number = *property_index;
return true;
}
u32 as_number() const
{
VERIFY(is_number());
return m_number;
}
FlyString const& as_string() const
{
VERIFY(is_string());
return m_string;
}
Symbol const* as_symbol() const
{
VERIFY(is_symbol());
return m_symbol;
}
String to_string() const
{
VERIFY(is_valid());
VERIFY(!is_symbol());
if (is_string())
return as_string();
return String::number(as_number());
}
StringOrSymbol to_string_or_symbol() const
{
VERIFY(is_valid());
VERIFY(!is_number());
if (is_string())
return StringOrSymbol(as_string());
return StringOrSymbol(as_symbol());
}
private:
Type m_type { Type::Invalid };
bool m_string_may_be_number { true };
FlyString m_string;
Symbol* m_symbol { nullptr };
u32 m_number { 0 };
};
struct PropertyNameTraits : public Traits<PropertyName> {
static unsigned hash(PropertyName const& name)
{
VERIFY(name.is_valid());
if (name.is_string())
return name.as_string().hash();
if (name.is_number())
return int_hash(name.as_number());
return ptr_hash(name.as_symbol());
}
static bool equals(PropertyName const& a, PropertyName const& b)
{
if (a.type() != b.type())
return false;
switch (a.type()) {
case PropertyName::Type::Number:
return a.as_number() == b.as_number();
case PropertyName::Type::String:
return a.as_string() == b.as_string();
case PropertyName::Type::Symbol:
return a.as_symbol() == b.as_symbol();
default:
VERIFY_NOT_REACHED();
}
}
};
}
namespace AK {
template<>
struct Formatter<JS::PropertyName> : Formatter<StringView> {
void format(FormatBuilder& builder, JS::PropertyName const& property_name)
{
if (!property_name.is_valid())
Formatter<StringView>::format(builder, "<invalid PropertyName>");
else if (property_name.is_number())
Formatter<StringView>::format(builder, String::number(property_name.as_number()));
else
Formatter<StringView>::format(builder, property_name.to_string_or_symbol().to_display_string());
}
};
}
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