X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=scpubgit%2FQ-Branch.git;a=blobdiff_plain;f=lib%2FSQL%2FAbstract%2FExtraClauses.pm;h=a4da3d7b4b19c5d008e95afedece42ddc02f9e4f;hp=9e5ddff4b9fd7479af4f6b47ee3e8c31fcd3e734;hb=7741b7ad9d94e2c060763b13ad5ce93764af6163;hpb=1ff9018cf680b289394dbf93c0ec533bfaead7a7

diff --git a/lib/SQL/Abstract/ExtraClauses.pm b/lib/SQL/Abstract/ExtraClauses.pm
index 9e5ddff..a4da3d7 100644
--- a/lib/SQL/Abstract/ExtraClauses.pm
+++ b/lib/SQL/Abstract/ExtraClauses.pm
@@ -18,9 +18,81 @@ sub new {
     $_[0]->_expand_maybe_list_expr($_[1], -ident)
   };
   $new->{expand_clause}{'select.having'} = sub {
-    $_[0]->expand_expr($_[1], -ident)
+    $_[0]->expand_expr($_[1])
   };
+  $new->{expand}{from_list} = '_expand_from_list';
+  $new->{render}{from_list} = '_render_from_list';
+  $new->{expand}{join} = '_expand_join';
+  $new->{render}{join} = '_render_join';
   return $new;
 }
 
+sub _expand_select_clause_from {
+  my ($self, $from) = @_;
+  +(from => $self->_expand_from_list(undef, $from));
+}
+
+sub _expand_from_list {
+  my ($self, undef, $args) = @_;
+  if (ref($args) eq 'HASH') {
+    return { -from_list => [ $self->expand_expr($args) ] };
+  }
+  my @list;
+  my @args = ref($args) ? @$args : ($args);
+  while (my $entry = shift @args) {
+    if (!ref($entry) and $entry =~ /^-/) {
+      $entry = { $entry => shift @args };
+    }
+    my $aqt = $self->expand_expr($entry, -ident);
+    if ($aqt->{-join} and not $aqt->{-join}{from}) {
+      $aqt->{-join}{from} = pop @list;
+    }
+    push @list, $aqt;
+  }
+  return { -from_list => \@list };
+}
+
+sub _expand_join {
+  my ($self, undef, $args) = @_;
+  my %proto = (
+    ref($args) eq 'HASH'
+      ? %$args
+      : (to => $args->[0], @{$args}[1..$#$args])
+  );
+  my %ret = map +($_ => $self->expand_expr($proto{$_}, -ident)),
+              sort keys %proto;
+  return +{ -join => \%ret };
+}
+
+sub _render_from_list {
+  my ($self, $list) = @_;
+  return $self->_join_parts(', ', map [ $self->render_aqt($_) ], @$list);
+}
+
+sub _render_join {
+  my ($self, $args) = @_;
+
+  my @parts = (
+    [ $self->render_aqt($args->{from}) ],
+    [ $self->_sqlcase(
+        ($args->{type}
+          ? join(' ', split '_', $args->{type}).' '
+          : ''
+        )
+        .'join'
+      )
+    ],
+    [ $self->render_aqt($args->{to}) ],
+    ($args->{on} ? (
+      [ $self->_sqlcase('on') ],
+      [ $self->render_aqt($args->{on}) ],
+    ) : ()),
+    ($args->{using} ? (
+      [ $self->_sqlcase('using') ],
+      [ $self->render_aqt($args->{using}) ],
+    ) : ()),
+  );
+  return $self->_join_parts(' ', @parts);
+}
+
 1;