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To: Simon Hay <simon.hay@lincoln.oxford.ac.uk>
Cc: sbp-interest@research.cs.berkeley.edu
Subject: [sbp-interest]  Re: SBP
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From: Adam Megacz <megacz@cs.berkeley.edu>
Organization: UC Berkeley
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Date: Wed, 19 Jul 2006 23:08:54 -0700
In-Reply-To: <A275F321-912B-4EE7-9E97-507C96D69273@lincoln.ox.ac.uk> (Simon
 Hay's message of "Wed, 19 Jul 2006 12:37:35 +0100")
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Simon Hay <simon.hay@lincoln.oxford.ac.uk> writes:
> but now it breaks (on the parser.parse() bit), either saying
>   unexpected character  '2' encountered at 1:0

I think you have an extra newline at the end of the input (which is
not part of the grammar) -- I get this error when I do that.  However,
this error message is absolutely wrong for what's happening, so I need
to fix it to complain about the "\n", not the "2".

> for e.g.
>      Expr    = [0-9]++
>              | Plus:: Expra "+" Expr
>      Expra   = ("a" | "b")
> trying a+2

I tried pasting your grammar into demo.g, your code into the body of
Demo.java and putting "a+2" in a file and passing that filename as the
second argument, and it worked.... making sure the input file had no
trailing newline.

  megacz@quine:~/edu.berkeley.sbp$make demo
  java -Xmx900m -cp edu.berkeley.sbp.jar edu.berkeley.sbp.misc.Demo \
          tests/demo.g \
          tests/demo.in
  Plus:{{2}}    

It takes a while to get accustomed to specifying whitespace in your
grammar files (ie lexerless/scannerless style).

> Sorry to be wasting so much of your time like this.

Not at all.  Especially now that this is on a mailing list, it's being
archived for future users to learn from.  Ask away ;)

  - a