package File::GlobMapper;

use strict;
use warnings;
use Carp;

our ($CSH_GLOB);

BEGIN
{
    if ($] < 5.006)
    { 
        require File::BSDGlob; import File::BSDGlob qw(:glob) ;
        $CSH_GLOB = File::BSDGlob::GLOB_CSH() ;
        *globber = \&File::BSDGlob::csh_glob;
    }  
    else
    { 
        require File::Glob; import File::Glob qw(:glob) ;
        $CSH_GLOB = File::Glob::GLOB_CSH() ;
        #*globber = \&File::Glob::bsd_glob;
        *globber = \&File::Glob::csh_glob;
    }  
}

our ($Error);

our ($VERSION, @EXPORT_OK);
$VERSION = '1.000';
@EXPORT_OK = qw( globmap );


our ($noPreBS, $metachars, $matchMetaRE, %mapping, %wildCount);
$noPreBS = '(?<!\\\)' ; # no preceeding backslash
$metachars = '.*?[](){}';
$matchMetaRE = '[' . quotemeta($metachars) . ']';

%mapping = (
                '*' => '([^/]*)',
                '?' => '([^/])',
                '.' => '\.',
                '[' => '([',
                '(' => '(',
                ')' => ')',
           );

%wildCount = map { $_ => 1 } qw/ * ? . { ( [ /;           

sub globmap ($$;)
{
    my $inputGlob = shift ;
    my $outputGlob = shift ;

    my $obj = new File::GlobMapper($inputGlob, $outputGlob, @_)
        or croak "globmap: $Error" ;
    return $obj->getFileMap();
}

sub new
{
    my $class = shift ;
    my $inputGlob = shift ;
    my $outputGlob = shift ;
    # TODO -- flags needs to default to whatever File::Glob does
    my $flags = shift || $CSH_GLOB ;
    #my $flags = shift ;

    $inputGlob =~ s/^\s*\<\s*//;
    $inputGlob =~ s/\s*\>\s*$//;

    $outputGlob =~ s/^\s*\<\s*//;
    $outputGlob =~ s/\s*\>\s*$//;

    my %object =
            (   InputGlob   => $inputGlob,
                OutputGlob  => $outputGlob,
                GlobFlags   => $flags,
                Braces      => 0,
                WildCount   => 0,
                Pairs       => [],
                Sigil       => '#',
            );

    my $self = bless \%object, ref($class) || $class ;

    $self->_parseInputGlob()
        or return undef ;

    $self->_parseOutputGlob()
        or return undef ;
    
    my @inputFiles = globber($self->{InputGlob}, $flags) ;

    if (GLOB_ERROR)
    {
        $Error = $!;
        return undef ;
    }

    #if (whatever)