Hello.

I realize this is not the Lexing solution you are going after, but I want to throw this out there. I also realize that this is probably not the most elegant solution, but it does seem to work with the input that you specified.

In any case I hope this helps.

Input

Host_Alias HA_FOO_GROUP = abc123, eigh456, \
                          foo987, bar654
#comment line
Runas_Alias RA_FOO_SVCACCT = www-data, ceph, \
                             sshd, memcache, \
                             xab123



#comment line
User_Alias CA_FOO_CSVACCT = www-foo, ceph, \
                             sshd, memcache, \
                             xab456
[download]

Output

C:\monks>perl parse.pl input.txt
Alias type : Host_Alias
Alias name : HA_FOO_GROUP
Values     : abc123 eigh456 foo987 bar654
 ****
Alias type : Runas_Alias
Alias name : RA_FOO_SVCACCT
Values     : www-data ceph sshd memcache xab123
 ****
Alias type : User_Alias
Alias name : CA_FOO_CSVACCT
Values     : www-foo ceph sshd memcache xab456
 ****

C:\monks>
[download]

Script

#/usr/bin/perl
use strict;
use warnings;

die "Error. Usage \'perl parse.pl inputfile.txt\'\n $!" unless $#ARGV 
+== 0;

my $in_filename  = shift @ARGV;

my $complete_line = "";

open(my $IN,"<",$in_filename)    || die "Cannot find input '$in_filena
+me'\n $!";
    while(<$IN>)
    {
        chomp;
        next if ($_ eq "");
        next if (m/^\#/);

        if ($_ =~ m/\\$/)
        {
            $_ =~ s/\\$//;
            $complete_line .= $_;
            next
        }

        $complete_line .= $_;

        # get alias type and name
    
            my $index_pos = index($complete_line,'=');
            my @alias_type_and_name =  split(/ /, substr($complete_lin
+e,0,$index_pos-1) );
            
        # get alias values

            my @alias_values = split(/\,/, substr($complete_line,$inde
+x_pos+1) );

            foreach my $v (@alias_values)
            {
                $v =~ s/^\s+//;
                $v =~ s/\s+$//;
            }

        # print values

            print "Alias type : $alias_type_and_name[0]\n";
            print "Alias name : $alias_type_and_name[1]\n";
            print "Values     : @alias_values\n ****\n";

        $complete_line = "";
    }
close($IN);
[download]

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