I am dealing with a data format that has a Pascal string representation like element to it. i.e. an integer followed a number of elements indicated by the leading integer. I'd like to encapsulate this within a Parse::RecDescent grammar using some of the magic from dynamically matched rules together with subrule repetition, but can't get it to work. Any recommendations? Code is below.
#!/usr/bin/perl
use strict;
use warnings;
use Test::More tests => 5;
use Parse::RecDescent;
my $p=Parse::RecDescent->new(q{
rec: int elem("$item[1]")
int: /\d+/
elem: /\S+/
});
ok($p->rec('0'));
ok($p->rec('1 foo'));
ok($p->rec('2 foo bar'));
ok(!$p->rec('1'));
ok(!$p->rec('1 foo bar'));
For now I am using the equivalent of:
rec: int elem(s?)
but that doesn't provide the check I want (i.e. the 4th and 5th tests fail) and is slower than I think it would be if I could specify the exact number of items to match.
Thanks, Les
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|