Implement String::substr.

diff --git a/lib/MooseX/AttributeHelpers/MethodProvider/String.pm b/lib/MooseX/AttributeHelpers/MethodProvider/String.pm
index 86bf8bd..e8a5028 100644 (file)
--- a/lib/MooseX/AttributeHelpers/MethodProvider/String.pm
+++ b/lib/MooseX/AttributeHelpers/MethodProvider/String.pm
@@ -68,10 +68,33 @@ sub inc : method {
 }
 
 sub clear : method {
-    my ($attr, $reader, $writer ) = @_;
+    my ($attr, $reader, $writer) = @_;
     return sub { $writer->( $_[0], '' ) }
 }
 
+sub substr : method {
+    my ($attr, $reader, $writer) = @_;
+    return sub {
+        my $self = shift;
+        my $v = $reader->($self);
+
+        my $offset      = defined $_[0] ? shift : 0;
+        my $length      = defined $_[0] ? shift : CORE::length($v);
+        my $replacement = defined $_[0] ? shift : undef;
+
+        my $ret;
+        if (defined $replacement) {
+            $ret = CORE::substr($v, $offset, $length, $replacement);
+            $writer->($self, $v);
+        }
+        else {
+            $ret = CORE::substr($v, $offset, $length);
+        }
+
+        return $ret;
+    };
+}
+
 1;
 
 __END__