Implement LAX and INTERMEDIATE modes as well

[acme-evil.git] / lib / evil.pm

diff --git a/lib/evil.pm b/lib/evil.pm
index db7968d102edd2ca1f1275b9ba522d966366dc0d..72dabb0d9746a2699367a20e36779a78738e71fe 100644 (file)
--- a/lib/evil.pm
+++ b/lib/evil.pm
@@ -7,22 +7,56 @@ use warnings;
 
 use Carp;
 
-our $VERSION = 0.001;
+my $INTERMEDIATE = __PACKAGE__.'/intermediate';
+my $LAX          = __PACKAGE__.'/lax';
+
+our $VERSION = 0.002;
 
 our %tainted;
-our $strict;
+our %wants_strict;
 
 sub import {
+       croak "Cannot load evil module when \"no evil ':strict'\" is in effect" if %wants_strict;
+
+       my $hinthash = (caller 0)[10] || {};
+       croak "Current module requested no evilness" if $hinthash->{$LAX};
+
+       $hinthash = (caller 3)[10] || {};
+       croak "Cannot load evil module when parent requested \"no evil ':lax'\"" if $hinthash->{$LAX};
+
+       my $level = 4;
+       my @caller;
+       while (@caller = caller $level) {
+               $hinthash = $caller[10] || {};
+               croak "Cannot load evil module when ancestor requested \"no evil ':intermediate'\""
+                 if $hinthash->{$INTERMEDIATE};
+               $level++;
+       }
+
        $tainted{caller()} = 1;
-       croak "Cannot load evil module when \"no evil ':strict'\" is in effect" if $strict;
 }
 
 sub unimport {
        my $strict_arg = grep /^:strict$/, @_;
-       carp 'no evil; interpreted as no evil ":strict". This will change in a future version of Acme::Evil' unless $strict_arg;
-       $strict = 1; # To be changed when other modes are implemented
-       if ($strict && %tainted) {
-               croak "Evil module already loaded. Cannot enforce \"no evil ':strict'\"";
+       my $intermediate_arg = grep /^:intermediate$/, @_;
+       my $lax_arg = grep /^:lax$/, @_;
+       my $disable_arg = grep /^:disable/, @_;
+
+       if (!$disable_arg && $tainted{caller()}) { # caller is evil
+               croak 'Current module is evil'
+       }
+
+       if ($strict_arg) {
+               $wants_strict{caller()} = 1;
+               croak "Evil module already loaded. Cannot enforce \"no evil ':strict'\"" if %tainted
+       } elsif ($lax_arg) {
+               $^H{$LAX} = 1
+       } elsif ($disable_arg) {
+               delete $wants_strict{caller()};
+               delete $^H{$LAX};
+               delete $^H{$INTERMEDIATE};
+       } else { # $intermediate_arg or no arg
+               $^H{$INTERMEDIATE} = $^H{$LAX} = 1
        }
 }
 
@@ -77,6 +111,11 @@ The calling module function properly if malignant code is loaded
 anywhere in the program. Throws an exception if an evil module is
 loaded, whether at the moment of calling this pragma or in the future.
 
+=item no B<evil> ':disable';
+
+Removes the effect of any previous C<no B<evil> ':strict'>. In other
+words evil modules will now be allowed to be loaded.
+
 =item no B<evil> ':intermediate'; (TODO)
 
 Not yet implemented. The calling module cannot function properly if it