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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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23
Libraries/LibJS/Runtime/Value.cpp
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@ -36,7 +36,9 @@
#include <LibJS/Runtime/NumberObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Symbol.h>
#include <LibJS/Runtime/StringObject.h>
#include <LibJS/Runtime/SymbolObject.h>
#include <LibJS/Runtime/Value.h>
#include <math.h>
@ -87,6 +89,9 @@ String Value::to_string_without_side_effects() const
if (is_string())
return m_value.as_string->string();
if (is_symbol())
return as_symbol().to_string();
ASSERT(is_object());
return String::format("[object %s]", as_object().class_name());
}
@ -124,6 +129,11 @@ String Value::to_string(Interpreter& interpreter) const
return String::format("%.4f", as_double());
}
if (is_symbol()) {
interpreter.throw_exception<TypeError>("Can't convert symbol to string");
return {};
}
if (is_object()) {
auto primitive_value = as_object().to_primitive(Object::PreferredType::String);
// FIXME: Maybe we should pass in the Interpreter& and call interpreter.exception() instead?
@ -152,6 +162,7 @@ bool Value::to_boolean() const
case Type::String:
return !as_string().string().is_empty();
case Type::Object:
case Type::Symbol:
return true;
default:
ASSERT_NOT_REACHED();
@ -173,6 +184,9 @@ Object* Value::to_object(Heap& heap) const
if (is_string())
return StringObject::create(heap.interpreter().global_object(), *m_value.as_string);
if (is_symbol())
return SymbolObject::create(heap.interpreter().global_object(), *m_value.as_symbol);
if (is_number())
return NumberObject::create(heap.interpreter().global_object(), m_value.as_double);
@ -216,6 +230,9 @@ Value Value::to_number() const
return js_nan();
return Value(parsed_double);
}
case Type::Symbol:
// FIXME: Get access to the interpreter and throw a TypeError
ASSERT_NOT_REACHED();
case Type::Object:
return m_value.as_object->to_primitive(Object::PreferredType::Number).to_number();
}
@ -473,6 +490,8 @@ bool same_value_non_numeric(Interpreter&, Value lhs, Value rhs)
return true;
case Value::Type::String:
return lhs.as_string().string() == rhs.as_string().string();
case Value::Type::Symbol:
return &lhs.as_symbol() == &rhs.as_symbol();
case Value::Type::Boolean:
return lhs.as_bool() == rhs.as_bool();
case Value::Type::Object:
@ -520,10 +539,10 @@ bool abstract_eq(Interpreter& interpreter, Value lhs, Value rhs)
if (rhs.is_boolean())
return abstract_eq(interpreter, lhs, rhs.to_number());
if ((lhs.is_string() || lhs.is_number()) && rhs.is_object())
if ((lhs.is_string() || lhs.is_number() || lhs.is_symbol()) && rhs.is_object())
return abstract_eq(interpreter, lhs, rhs.to_primitive(interpreter));
if (lhs.is_object() && (rhs.is_string() || rhs.is_number()))
if (lhs.is_object() && (rhs.is_string() || rhs.is_number() || rhs.is_symbol()))
return abstract_eq(interpreter, lhs.to_primitive(interpreter), rhs);
return false;