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#!/usr/bin/perl -w
use Parse::RecDescent;
#$RD_TRACE=1;
#$RD_HINT=1;
my $parser = Parse::RecDescent->new(<<'EOG') or die;
list1N: <rightop: term ',' term>(s)
list12: <rightop: term ',' term>(..2)
list2N: <rightop: term ',' term>(2..)
list01: <rightop: term ',' term>(?)
list: <rightop: term ',' term>
list0N: <rightop: term ',' term>(s?)
list23: <rightop: term ',' term>(2..3)
list03: <rightop: term ',' term>(0..3)
term: 't'
EOG
while (<DATA>)
{
print;
print "\tlist:\t", @{$parser->list($_)||['undef']}, "\n";
print "\tlist01:\t", @{$parser->list01($_)||['undef']}, "\n";
print "\tlist0N:\t", @{$parser->list0N($_)||['undef']}, "\n";
print "\tlist1N:\t", @{$parser->list1N($_)||['undef']}, "\n";
print "\tlist2N:\t", @{$parser->list2N($_)||['undef']}, "\n";
print "\tlist23:\t", @{$parser->list23($_)||['undef']}, "\n";
print "\tlist12:\t", @{$parser->list12($_)||['undef']}, "\n";
print "\tlist03:\t", @{$parser->list03($_)||['undef']}, "\n";
print "-----\n";
}
__DATA__
t
t,t
t,t,t
t,t,t,t