Hi Mariano,

_,,,^..^,,,_ (phone)

On Jul 24, 2017, at 9:21 AM, Mariano Martinez Peck <marianopeck@gmail.com> wrote:

Hi guys,

Is there a portable (that would work in GemStone too) and safe way to know if a String would be a block?��

I must support this kind of strings:

'singleString' �� -> false

'multi string' -> false

' �� �� ��[:a | 42]' -> true

' �� '' '' ��[:a | 42]' -> true

'[:a | 42]' -> true

' "a commet" [:a | 42]' -> true

' WhateverClass someVeryBadHackishMethod. [:a | 42]' -> true��

I need to identify whether the string is a closure or not. And ideally, I don't want to do an #evaluate: because I don't want any left hand code to be executed.��
I tried with #parse: ��why I am having problems.��

Any ideas?

Not sure if you're still stuck but if you dive into evaluate: you'll be able to find the point at which it parses, and��find out how to invoke the parser for an expression (a doit).�� ��evaluate: parses an expression so you want to check that the resulting parse tree is that of a return node whose expression is a literal block.�� You can also check the block's argument count.

Once you've extracted the parser invocation you can wrap this in a suitable exception handler.�� Then you have your block parser.�� You still have to validate the parse tree and/or generated code before evaluating since someone could write malicious code within the block right?

Thanks in advance

--

Mariano
http://marianopeck.wordpress.com