package Git::SVN::GlobSpec;
use strict;
use warnings;

sub new {
        my ($class, $glob, $pattern_ok) = @_;
        my $re = $glob;
        $re =~ s!/+$!!g; # no need for trailing slashes
        my (@left, @right, @patterns);
        my $state = "left";
        my $die_msg = "Only one set of wildcards " .
                                "(e.g. '*' or '*/*/*') is supported: $glob\n";
        for my $part (split(m|/|, $glob)) {
                if ($pattern_ok && $part =~ /[{}]/ &&
                         $part !~ /^\{[^{}]+\}/) {
                        die "Invalid pattern in '$glob': $part\n";
                }
                my $nstars = $part =~ tr/*//;
                if ($nstars > 1) {
                        die "Only one '*' is allowed in a pattern: '$part'\n";
                }
                if ($part =~ /(.*)\*(.*)/) {
                        die $die_msg if $state eq "right";
                        my ($l, $r) = ($1, $2);
                        $state = "pattern";
                        my $pat = quotemeta($l) . '[^/]*' . quotemeta($r);
                        push(@patterns, $pat);
                } elsif ($pattern_ok && $part =~ /^\{(.*)\}$/) {
                        die $die_msg if $state eq "right";
                        $state = "pattern";
                        my $p = quotemeta($1);
                        $p =~ s/\\,/|/g;
                        push(@patterns, "(?:$p)");
                } else {
                        if ($state eq "left") {
                                push(@left, $part);
                        } else {
                                push(@right, $part);
                                $state = "right";
                        }
                }
        }
        my $depth = @patterns;
        if ($depth == 0) {
                die "One '*' is needed in glob: '$glob'\n";
        }
        my $left = join('/', @left);
        my $right = join('/', @right);
        $re = join('/', @patterns);
        $re = join('\/',
                   grep(length, quotemeta($left),
                                "($re)(?=/|\$)",
                                quotemeta($right)));
        my $left_re = qr/^\/\Q$left\E(\/|$)/;
        bless { left => $left, right => $right, left_regex => $left_re,
                regex => qr/$re/, glob => $glob, depth => $depth }, $class;
}

sub full_path {
        my ($self, $path) = @_;
        return (length $self->{left} ? "$self->{left}/" : '') .
               $path . (length $self->{right} ? "/$self->{right}" : '');
}

1;