Hi Mariano, _,,,^..^,,,_ (phone)
> On Jul 24, 2017, at 9:21 AM, Mariano Martinez Peck <[email protected]> > 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
