Boolification-derived-stringification is a thing... just shoot me now

[dbsrgits/SQL-Abstract.git] / lib / SQL / Abstract.pm

diff --git a/lib/SQL/Abstract.pm b/lib/SQL/Abstract.pm
index ce4ead9..c88d0c2 100644 (file)
--- a/lib/SQL/Abstract.pm
+++ b/lib/SQL/Abstract.pm
@@ -84,42 +84,49 @@ sub is_literal_value ($) {
 # FIXME XSify - this can be done so much more efficiently
 sub is_plain_value ($) {
   no strict 'refs';
-    ! length ref $_[0]                                        ? [ $_[0] ]
+    ! length ref $_[0]                                        ? \($_[0])
   : (
     ref $_[0] eq 'HASH' and keys %{$_[0]} == 1
       and
     exists $_[0]->{-value}
-  )                                                           ? [ $_[0]->{-value} ]
+  )                                                           ? \($_[0]->{-value})
   : (
-      Scalar::Util::blessed $_[0]
+      # reuse @_ for even moar speedz
+      defined ( $_[1] = Scalar::Util::blessed $_[0] )
         and
       # deliberately not using Devel::OverloadInfo - the checks we are
       # intersted in are much more limited than the fullblown thing, and
       # this is a very hot piece of code
       (
-        # FIXME - DBI needs fixing to stringify regardless of DBD
+        # simply using ->can('(""') can leave behind stub methods that
+        # break actually using the overload later (see L<perldiag/Stub
+        # found while resolving method "%s" overloading "%s" in package
+        # "%s"> and the source of overload::mycan())
         #
         # either has stringification which DBI SHOULD prefer out of the box
-        $_[0]->can( '(""' )
+        grep { *{ (qq[${_}::(""]) }{CODE} } @{ $_[2] = mro::get_linear_isa( $_[1] ) }
           or
-        # has nummification and fallback is *not* disabled
-        # reuse @_ for even moar speedz
+        # has nummification or boolification, AND fallback is *not* disabled
         (
-          $_[0]->can('(0+')
+          (
+            grep { *{"${_}::(0+"}{CODE} } @{$_[2]}
+              or
+            grep { *{"${_}::(bool"}{CODE} } @{$_[2]}
+          )
             and
           (
             # no fallback specified at all
-            ! ( ($_[1]) = grep { *{"${_}::()"}{CODE} } @{ mro::get_linear_isa( ref $_[0] ) } )
+            ! ( ($_[3]) = grep { *{"${_}::()"}{CODE} } @{$_[2]} )
               or
             # fallback explicitly undef
-            ! defined ${"$_[1]::()"}
+            ! defined ${"$_[3]::()"}
               or
             # explicitly true
-            ${"$_[1]::()"}
+            !! ${"$_[3]::()"}
           )
         )
       )
-    )                                                          ? [ "$_[0]" ]
+    )                                                          ? \($_[0])
   : undef;
 }
 
@@ -733,8 +740,8 @@ sub _where_op_BOOL {
 sub _where_op_IDENT {
   my $self = shift;
   my ($op, $rhs) = splice @_, -2;
-  if (ref $rhs) {
-    puke "-$op takes a single scalar argument (a quotable identifier)";
+  if (! defined $rhs or length ref $rhs) {
+    puke "-$op requires a single plain scalar argument (a quotable identifier)";
   }
 
   # in case we are called as a top level special op (no '=')
@@ -2143,9 +2150,8 @@ module:
 
 =back
 
-On failure returns C<undef>, on sucess returns a reference to a single
-element array containing the string-version of the supplied argument or
-C<[ undef ]> in case of an undefined initial argument.
+On failure returns C<undef>, on sucess returns a B<scalar> reference
+to the original supplied argument.
 
 =head2 is_literal_value
 
@@ -2162,8 +2168,8 @@ module:
 
 =back
 
-On failure returns C<undef>, on sucess returns a reference to an array
-cotaining the unpacked version of the supplied literal SQL and bind values.
+On failure returns C<undef>, on sucess returns an B<array> reference
+containing the unpacked version of the supplied literal SQL and bind values.
 
 =head1 WHERE CLAUSES