1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/git/perl/Git/SVN/GlobSpec.pm b/third_party/git/perl/Git/SVN/GlobSpec.pm
new file mode 100644
index 000000000000..a0a8d1762150
--- /dev/null
+++ b/third_party/git/perl/Git/SVN/GlobSpec.pm
@@ -0,0 +1,65 @@
+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;