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LibJS: Implement 'new.target'

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This adds a new MetaProperty AST node which will be used for
'new.target' and 'import.meta' meta properties. The parser now
distinguishes between "in function context" and "in arrow function
context" (which is required for this).
When encountering TokenType::New we will attempt to parse it as meta
property and resort to regular new expression parsing if that fails,
much like the parsing of labelled statements.
This commit is contained in:
Linus Groh
2020-11-02 21:27:42 +00:00
committed by Andreas Kling
parent e07a39c816
commit 39a1c9d827
Notes: sideshowbarker 2024-07-19 01:34:39 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/39a1c9d8276
Pull-request: https://github.com/SerenityOS/serenity/pull/3923
Reviewed-by: https://github.com/awesomekling
6 changed files with 109 additions and 10 deletions
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22
Libraries/LibJS/AST.cpp
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@@ -1655,6 +1655,28 @@ Value MemberExpression::execute(Interpreter& interpreter, GlobalObject& global_o
return object_result->get(property_name).value_or(js_undefined());
}
void MetaProperty::dump(int indent) const
{
String name;
if (m_type == MetaProperty::Type::NewTarget)
name = "new.target";
else if (m_type == MetaProperty::Type::ImportMeta)
name = "import.meta";
else
ASSERT_NOT_REACHED();
print_indent(indent);
printf("%s %s\n", class_name(), name.characters());
}
Value MetaProperty::execute(Interpreter& interpreter, GlobalObject&) const
{
if (m_type == MetaProperty::Type::NewTarget)
return interpreter.vm().get_new_target().value_or(js_undefined());
if (m_type == MetaProperty::Type::ImportMeta)
TODO();
ASSERT_NOT_REACHED();
}
Value StringLiteral::execute(Interpreter& interpreter, GlobalObject&) const
{
return js_string(interpreter.heap(), m_value);