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LibJS: Implement typeof operator

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This commit is contained in:
Conrad Pankoff 2020-03-18 06:33:32 +11:00 • committed by Andreas Kling
parent 0a71533aff
commit 46a897b59b
4 changed files with 27 additions and 1 deletions
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20
Libraries/LibJS/AST.cpp
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@ -199,6 +199,23 @@ Value UnaryExpression::execute(Interpreter& interpreter) const
return bitwise_not(lhs_result);
case UnaryOp::Not:
return Value(!lhs_result.to_boolean());
case UnaryOp::Typeof:
switch (lhs_result.type()) {
case Value::Type::Undefined:
return js_string(interpreter.heap(), "undefined");
case Value::Type::Null:
// yes, this is on purpose. yes, this is how javascript works.
// yes, it's silly.
return js_string(interpreter.heap(), "object");
case Value::Type::Number:
return js_string(interpreter.heap(), "number");
case Value::Type::String:
return js_string(interpreter.heap(), "string");
case Value::Type::Object:
return js_string(interpreter.heap(), "object");
case Value::Type::Boolean:
return js_string(interpreter.heap(), "boolean");
}
}
ASSERT_NOT_REACHED();
@ -318,6 +335,9 @@ void UnaryExpression::dump(int indent) const
case UnaryOp::Not:
op_string = "!";
break;
case UnaryOp::Typeof:
op_string = "typeof ";
break;
}
print_indent(indent);