Paul McGuire <[EMAIL PROTECTED]> writes:
[...]
> lambda is handy in defining parse actions in pyparsing. Parse actions
> are callbacks to be run when an expression within a larger grammar is
> matched. A common use for parse actions is to do some sort of text or
> type conversion. The simplest parse actions are called using the list
> of matched tokens. Here is a subexpression that will convert numeric
> strings found in a larger grammar to ints:
>
> integer = Word("0123456789").setParseAction(lambda tokens:
> int(tokens[0]) )
Could you use it as a decoratore instead?
integer = Word("0123456789")
@integer.setParseAction
def parse_integer(tokens):
return int(tokens[0])
I could make your grammar clearer, because you don't mix it with
processing code... and no need for lambdas!
--
Arnaud
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