Hiya, I am trying to allow any amount of characters to go on multiple lines of a text area before the print statement, and parse a print statement whilst using Parse::Recdescent, but am having trouble. It will say there is an error if the letter p shows up anywhere else in the script before the print function is used, but if the letter p is typed in the textarea beforehand i dont want an error to show. How can i overcome this? The problem is the "text: /([^p]*)/" bit. Here is what i have. Cheers

#!/usr/bin/perl

use strict;
use Tk;
use Parse::RecDescent;

my $mw = new MainWindow;
my $mw2 = $mw->Text()->pack();
my $mw3 = $mw->Button(-text=>"Check brackets",
                      -command => [ \&parser, $mw2 ]
                      )->pack();
MainLoop;

sub parser {
    my $txt = shift;
    my $grammar = q {
startrule: anything print open text close end 
anything:/([^p]*)/
print: "print"
open: "'"
text: /([^']*)/
close: "'"
end: ";"
};
    my $parser = Parse::RecDescent->new($grammar);
    if ( defined( $parser->startrule( $txt->get( "1.0", "end" )))) {
        print "NO ERROR\n";
    } else {
        print "Print function error\n";
    }
}

[download]

Also, i am wondering if i can get it so multiple print functions can appear down the text area and if there is an error with a later function, it will be spotted.
Cheers

20050331 Janitored by Corion: Put code in code tags.

In reply to Parse::Recdescent rule problem by hak0983

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.