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LibJS: Remove UndefinedLiteral, add undefined to global object

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There is no such thing as a "undefined literal" in JS - undefined is
just a property on the global object with a value of undefined.
This is pretty similar to NaN.

var undefined = "foo"; is a perfectly fine AssignmentExpression :^)
This commit is contained in:
Linus Groh 2020-04-02 22:08:14 +01:00 • committed by Andreas Kling
parent 543c6e00db
commit 2636cac6e4
6 changed files with 1 additions and 30 deletions
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4
Libraries/LibJS/Parser.cpp
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@ -329,9 +329,6 @@ NonnullRefPtr<Expression> Parser::parse_primary_expression()
case TokenType::NullLiteral:
consume();
return create_ast_node<NullLiteral>();
case TokenType::UndefinedLiteral:
consume();
return create_ast_node<UndefinedLiteral>();
case TokenType::CurlyOpen:
return parse_object_expression();
case TokenType::Function:
@ -821,7 +818,6 @@ bool Parser::match_expression() const
return type == TokenType::BoolLiteral
|| type == TokenType::NumericLiteral
|| type == TokenType::StringLiteral
|| type == TokenType::UndefinedLiteral
|| type == TokenType::NullLiteral
|| type == TokenType::Identifier
|| type == TokenType::New