[Pyparsing] Parsing/lexing Tcl style {} strings

[Ian B. <ia...@co...>]

Howdy.  I'm hoping someone can give me an idea of how to parse/lex 
Tcl-style {} strings.  In Tcl a string like {this} is basically 
equivalent to "this", except that when you get the string you keep the 
{}'s balanced.  So you can have:

proc keep_trying {
   do_forever {
     stuff
   }
}

And that calls proc('keep_trying', '\n  do forever {\n    stuff\n  }\n')

So you don't actually descend into {} strings at all (meaning that you'd 
have to parse the stuff in {} later, but that's fine).  I don't think 
you can match this with a regular expression.  Is there a way to match 
this while keeping the {}'s balanced?

-- 
Ian Bicking : ia...@co... : http://blog.ianbicking.org