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LibJS: Implement the "instanceof" operator

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This operator walks the prototype chain of the RHS value and looks for
a "prototype" property with the same value as the prototype of the LHS.

This is pretty cool. :^)
This commit is contained in:
Andreas Kling 2020-03-28 16:56:54 +01:00
parent 37fe16a99c
commit a3d92b1210
6 changed files with 41 additions and 1 deletions
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6
Libraries/LibJS/Parser.cpp
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@ -393,6 +393,9 @@ NonnullRefPtr<Expression> Parser::parse_secondary_expression(NonnullRefPtr<Expre
case TokenType::ExclamationMarkEquals:
consume();
return create_ast_node<BinaryExpression>(BinaryOp::AbstractInequals, move(lhs), parse_expression(min_precedence, associativity));
case TokenType::Instanceof:
consume();
return create_ast_node<BinaryExpression>(BinaryOp::InstanceOf, move(lhs), parse_expression(min_precedence, associativity));
case TokenType::ParenOpen:
return parse_call_expression(move(lhs));
case TokenType::Equals:
@ -722,7 +725,8 @@ bool Parser::match_secondary_expression() const
|| type == TokenType::Period
|| type == TokenType::BracketOpen
|| type == TokenType::PlusPlus
|| type == TokenType::MinusMinus;
|| type == TokenType::MinusMinus
|| type == TokenType::Instanceof;
}
bool Parser::match_statement() const