[rspec-users] Step matchers

David Chelimsky dchelimsky at gmail.com
Mon Oct 15 10:24:43 EDT 2007

On 10/15/07, Wincent Colaiuta <win at wincent.com> wrote:
> El 15/10/2007, a las 14:21, "Pat Maddox" <pergesu at gmail.com> escribió:
> > On 10/14/07, David Chelimsky <dchelimsky at gmail.com> wrote:
> >> On 10/14/07, Pat Maddox <pergesu at gmail.com> wrote:
> >>> Actually a parser for this would be quite simple
> >>
> >> Dead simple. It would also allow us to do away with methods like
> >> Given, When and Then, which some people have objected to (because of
> >> the capitalization), because the stories are no longer expressed
> >> directly in Ruby. Internally, the parser could use a StepFactory
> >> to do
> >> things like create_given, create_when, etc (or however we decide to
> >> name these).
> >
> > Jay mentioned antlr.  This parser is so simple though that I doubt we
> > would need/want that.  There's not really any parsing at all in fact.
> > You just look at each line, figure out what token it is, and pass the
> > following string to a constructor.  It should be like 60 lines of Ruby
> > code, and we don't have any external dependencies.
> I've done a couple of month's work with ANTLR (3.0) this year and
> based on my experiences I'd say it's not the right tool for this kind
> of job. You use ANTLR if:
> 1. Parsing speed is really important.
> 2. You need to recognize a relatively complex grammar (most likely a
> context-sensitive language).
> 3. You don't mind being tied to Java tool-chain

Not a chance in this case.


> (even though your
> output target language is non-Java, the ANTLR tool itself is Java).
> 4. You have lots of time on your hands to develop, debug and fine-
> tune the delicate and complex machinery that is an ANTLR-generated
> recognizer.
> In short, I found ANTLR fiendishly difficult to use, so for a simple
> task like this, especially one where parsing is *not* going to be a
> bottleneck, the simplest possible solution (parsing with hand-written
> Ruby) is going to be the best one.
> Cheers,
> Wincent
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