private static bool IsSpecialUndefinedCheck(Closure closure)
{
// TODO: this optimization should happen during Ast Convertion, not here!
var body = closure.Function.Body;
if (body == null)
{
return(false);
}
var returnStatement = body as ReturnStatement;
var binaryExpression = returnStatement?.ReturnExpression as BinaryExpression;
// closure has a following content: x => return left OP right;
if (
(binaryExpression?.LeftExpression as LocalReferenceExpression)?.Index == 0 &&
binaryExpression.OperatorKind == BinaryOperator.NotEqual &&
binaryExpression.RightExpression == UndefinedLiteral.Instance)
{
// got the match!
return(true);
}
return(false);
}
/// <nodoc />
public bool Equals(Closure c)
{
return(c.Env.Path == Env.Path &&
c.Function.Name == Function.Name &&
c.Location == Location);
}