add slice_subquery method for DBIC introspection

[dbsrgits/Data-Query.git] / lib / Data / Query / ExprHelpers.pm

diff --git a/lib/Data/Query/ExprHelpers.pm b/lib/Data/Query/ExprHelpers.pm
index be56f2f..809948e 100644 (file)
--- a/lib/Data/Query/ExprHelpers.pm
+++ b/lib/Data/Query/ExprHelpers.pm
@@ -5,7 +5,11 @@ use Data::Query::Constants;
 
 use base qw(Exporter);
 
-our @EXPORT = qw(perl_scalar_value perl_operator Literal Identifier compose);
+our @EXPORT = qw(
+  perl_scalar_value perl_operator Literal Identifier compose intersperse
+);
+
+sub intersperse { my $i = shift; my @i = map +($_, $i), @_; pop @i; @i }
 
 sub perl_scalar_value {
   +{
@@ -71,13 +75,21 @@ foreach my $name (values %Data::Query::Constants::CONST) {
     $dq->{type} and $dq->{type} eq $name
   };
   push @EXPORT, $sub;
-  if ($map{$name}) {
-    my @map = @{$map{$name}};
+  if (my @map = @{$map{$name}||[]}) {
     *$name = sub {
       my $dq = { type => $name };
-      foreach (0..$#_) {
+      foreach (0..$#map) {
         $dq->{$map[$_]} = $_[$_] if defined $_[$_];
       }
+
+      if (my $optional = $_[$#map+1]) {
+        unless(ref $optional eq 'HASH') {
+          require Carp;
+          Carp::croak("Not a hashreference");
+        }
+        @{$dq}{keys %$optional} = values %$optional;
+      }
+
       return $dq;
     };
     push @EXPORT, $name;