X-Git-Url: http://wagnertech.de/git?a=blobdiff_plain;f=SL%2FMoreCommon.pm;h=0d5413b1a90be01a19c1c0e7794158530aa67053;hb=738c240ad3a167dd3013ef01f0892b5589fd7d9a;hp=1ee62cca4118ac961e92e5ec3d6833bc2d6b6209;hpb=bc40c9890a1798edd9038d7d558a5e2df1ef21fd;p=kivitendo-erp.git

diff --git a/SL/MoreCommon.pm b/SL/MoreCommon.pm
index 1ee62cca4..0d5413b1a 100644
--- a/SL/MoreCommon.pm
+++ b/SL/MoreCommon.pm
@@ -1,14 +1,17 @@
 package SL::MoreCommon;
 
 require Exporter;
-@ISA = qw(Exporter);
+our @ISA = qw(Exporter);
 
-@EXPORT = qw(save_form restore_form compare_numbers any cross);
+our @EXPORT    = qw(save_form restore_form compare_numbers any cross);
+our @EXPORT_OK = qw(ary_union ary_intersect ary_diff listify);
 
 use YAML;
 
 use SL::AM;
 
+use strict;
+
 sub save_form {
   $main::lxdebug->enter_sub();
 
@@ -85,24 +88,6 @@ sub any (&@) {
   return 0;
 }
 
-=item cross BLOCK ARRAY ARRAY
-
-Evaluates BLOCK for each combination of elements in ARRAY1 and ARRAY2
-and returns a new list consisting of BLOCK's return values.
-The two elements are set to $a and $b.
-Note that those two are aliases to the original value so changing them
-will modify the input arrays.
-
-  # append each to each
-  @a = qw/a b c/;
-  @b = qw/1 2 3/;
-  @x = cross { "$a$b" } @a, @b;
-  # returns a1, a2, a3, b1, b2, b3, c1, c2, c3
-
-As cross expects an array but returns a list it is not directly chainable
-at the moment. This will be corrected in the future.
-
-=cut
 sub cross(&\@\@) {
   my $op = shift;
   use vars qw/@A @B/;
@@ -127,4 +112,84 @@ sub cross(&\@\@) {
   }  0 .. $#A;
 }
 
+sub _ary_calc_union_intersect {
+  my ($a, $b) = @_;
+
+  my %count = ();
+
+  foreach my $e (@$a, @$b) { $count{$e}++ }
+
+  my @union = ();
+  my @isect = ();
+  foreach my $e (keys %count) {
+    push @union, $e;
+    push @isect, $e if $count{$e} == 2;
+  }
+
+  return (\@union, \@isect);
+}
+
+sub ary_union {
+  return @{ (_ary_calc_union_intersect @_)[0] };
+}
+
+sub ary_intersect {
+  return @{ (_ary_calc_union_intersect @_)[1] };
+}
+
+sub ary_diff {
+  my ($a, $b) = @_;
+  my %in_b    = map { $_ => 1 } @$b;
+  return grep { !$in_b{$_} } @$a;
+}
+
+sub listify {
+  my @ary = scalar @_ > 1 ? @_ : ref $_[0] eq 'ARRAY' ? @{ $_[0] } : (@_);
+  return wantarray ? @ary : scalar @ary;
+}
+
 1;
+
+__END__
+
+=head1 NAME
+
+SL::MoreCommon.pm - helper functions
+
+=head1 DESCRIPTION
+
+this is a collection of helper functions used in Lx-Office.
+Most of them are either obvious or too obscure to care about unless you really have to.
+The exceptions are documented here.
+
+=head2 FUNCTIONS
+
+=over 4
+
+=item save_form
+=item restore_form
+
+A lot of the old sql-ledger routines are strictly procedural. They search for params in the $form object, do stuff with it, and return a status code.
+
+Once in a while you'll want something from such a function without altering $form. Yeah, you could rewrite the routine from scratch... not. Just save you form, execute the routine, grab your results, and restore the previous form while you curse at the original design.
+
+=item cross BLOCK ARRAY ARRAY
+
+Evaluates BLOCK for each combination of elements in ARRAY1 and ARRAY2
+and returns a new list consisting of BLOCK's return values.
+The two elements are set to $a and $b.
+Note that those two are aliases to the original value so changing them
+will modify the input arrays.
+
+  # append each to each
+  @a = qw/a b c/;
+  @b = qw/1 2 3/;
+  @x = cross { "$a$b" } @a, @b;
+  # returns a1, a2, a3, b1, b2, b3, c1, c2, c3
+
+As cross expects an array but returns a list it is not directly chainable
+at the moment. This will be corrected in the future.
+
+=back
+
+=cut