1 package Embed::Persistent;
4 #require Devel::Symdump;
8 sub valid_package_name {
10 $string =~ s/([^A-Za-z0-9\/])/sprintf("_%2x",unpack("C",$1))/eg;
11 #second pass only for words starting with a digit
12 $string =~ s|/(\d)|sprintf("/_%2x",unpack("C",$1))|eg;
14 #Dress it up as a real package name
16 return "Embed" . $string;
19 #borrowed from Safe.pm
25 $pkg = "main::$pkg\::"; # expand to full symbol table name
26 ($stem, $leaf) = $pkg =~ m/(.*::)(\w+::)$/;
28 my $stem_symtab = *{$stem}{HASH };
30 delete $stem_symtab->{$leaf };
34 my($filename, $delete) = @_;
35 my $package = valid_package_name($filename);
36 my $mtime = -M $filename;
37 if(defined $Cache{$package}{mtime} && $Cache{$package}{mtime } <= $mtime) {
38 #we have compiled this subroutine already,
39 #it has not been updated on disk, nothing left to do
40 print STDERR "already compiled $package->handler\n";
43 open FH, $filename or die "open '$filename' $!";
48 #wrap the code into a subroutine inside our unique package
49 my $eval = qq{package $package; sub handler { $sub; }};
51 #hide our variables within this block
52 my($filename,$mtime,$package,$sub);
57 #cache it unless we're cleaning out each time
58 $Cache{$package}{mtime} = $mtime unless $delete;
61 eval {$package->handler;};
64 delete_package($package) if $delete;
66 #take a look if you want
67 #print Devel::Symdump->rnew($package)->as_string, $/;