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LibJS: Add symbol objects

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This commit adds the following classes: SymbolObject, SymbolConstructor,
SymbolPrototype, and Symbol. This commit does not introduce any
new functionality to the Object class, so they cannot be used as
property keys in objects.
This commit is contained in:
mattco98 2020-04-29 23:25:21 -07:00 • committed by Andreas Kling
parent b5b08fba92
commit 4ced126704
21 changed files with 819 additions and 3 deletions
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22
Libraries/LibJS/Runtime/Value.h
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@ -30,6 +30,7 @@
#include <AK/Forward.h>
#include <AK/LogStream.h>
#include <LibJS/Forward.h>
#include <LibJS/Runtime/Symbol.h>
namespace JS {
@ -43,6 +44,7 @@ public:
String,
Object,
Boolean,
Symbol,
};
bool is_empty() const { return m_type == Type::Empty; }
@ -52,6 +54,7 @@ public:
bool is_string() const { return m_type == Type::String; }
bool is_object() const { return m_type == Type::Object; }
bool is_boolean() const { return m_type == Type::Boolean; }
bool is_symbol() const { return m_type == Type::Symbol; }
bool is_cell() const { return is_string() || is_object(); }
bool is_array() const;
bool is_function() const;
@ -110,6 +113,12 @@ public:
m_value.as_string = string;
}
Value(Symbol* symbol)
: m_type(Type::Symbol)
{
m_value.as_symbol = symbol;
}
explicit Value(Type type)
: m_type(type)
{
@ -153,6 +162,18 @@ public:
return *m_value.as_string;
}
Symbol& as_symbol()
{
ASSERT(is_symbol());
return *m_value.as_symbol;
}
const Symbol& as_symbol() const
{
ASSERT(is_symbol());
return *m_value.as_symbol;
}
Cell* as_cell()
{
ASSERT(is_cell());
@ -188,6 +209,7 @@ private:
bool as_bool;
double as_double;
PrimitiveString* as_string;
Symbol* as_symbol;
Object* as_object;
Cell* as_cell;
} m_value;