handle no __DATA__ sections

Changes

@@ -1,4 +1,8 @@
 Revision history for Data-Section
 
+0.002     2008-06-07
+          improve documentation
+          handle valid classes with no __DATA__ section
+
 0.001     2008-06-07
           first release

lib/Data/Section.pm

@@ -47,6 +47,11 @@ Data::Section provides an easy way to access multiple named chunks of
 line-oriented data in your module's DATA section.  It was written to allow
 modules to store their own templates, but probably has other uses.
 
+=head1 WARNING
+
+You will need to use C<__DATA__> sections and not C<__END__> sections.  Yes, it
+matters.  Who knew!
+
 =head1 EXPORTS
 
 To get the methods exported by Data::Section, you must import like this:
@@ -60,7 +65,7 @@ Optional arguments may be given to Data::Section like this:
 Valid arguments are:
 
   inherit - if true, allow packages to inherit the data of the packages
-            from which they inherit
+            from which they inherit; default: true
 
   header_re - if given, changes the regex used to find section headers
               in the data section; it should leave the section name in $1
@@ -141,6 +146,7 @@ sub _mk_reader_group {
     my $template = $stash{ $pkg } = { };
 
     my $dh = do { no strict 'refs'; \*{"$pkg\::DATA"} }; ## no critic Strict
+    return $stash{ $pkg} unless defined fileno *$dh;
 
     my $current;
     LINE: while (my $line = <$dh>) {

t/basic.t

@@ -1,7 +1,7 @@
 use strict;
 use warnings;
 use lib 't/lib';
-use Test::More tests => 18;
+use Test::More tests => 19;
 
 use Parent;
 use Child;
@@ -11,6 +11,8 @@ use I::Parent;
 use I::Child;
 use I::Grandchild;
 
+use NoData;
+
 my @want = (
   Parent     => { a => \"1\n",   b => \"2\n",  c => \"3\n" },
   Child      => {                b => \"22\n", c => \"33\n", d => \"44\n" },
@@ -47,5 +49,6 @@ is_deeply(
   I::Grandchild->merged_section_data,
   { a => \"111\n", b => \"22\n", c => \"33\n", d => \q{}, },
   "I::Grandchild->merged_section_data",
-)
+);
 
+is_deeply(NoData->local_section_data, {}, "nothing found in NoData");