From: Matt S Trout <mst@shadowcat.co.uk>
Date: Sun, 14 Apr 2019 18:01:25 +0000 (+0000)
Subject: introduce "top level" concept, move -values to Clauses to use it
X-Git-Tag: v2.000000~3^2~242
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=434c40f14ac84178bd80c054d439f57e7bdbde30;p=dbsrgits%2FSQL-Abstract.git

introduce "top level" concept, move -values to Clauses to use it
---

diff --git a/lib/SQL/Abstract.pm b/lib/SQL/Abstract.pm
index dce3b5c..1d699bb 100644
--- a/lib/SQL/Abstract.pm
+++ b/lib/SQL/Abstract.pm
@@ -209,7 +209,6 @@ sub new {
     ident => '_expand_ident',
     value => '_expand_value',
     func => '_expand_func',
-    values => '_expand_values',
   };
 
   $opt{expand_op} = {
@@ -225,7 +224,7 @@ sub new {
   };
 
   $opt{render} = {
-    (map +($_, "_render_$_"), qw(op func bind ident literal row values)),
+    (map +($_, "_render_$_"), qw(op func bind ident literal row)),
     %{$opt{render}||{}}
   };
 
@@ -272,7 +271,7 @@ sub insert {
 
   my @parts = ([ $self->_sqlcase('insert into').' '.$table ]);
   push @parts, [ $self->render_aqt($f_aqt) ] if $f_aqt;
-  push @parts, [ $self->render_aqt({ -values => $v_aqt }) ];
+  push @parts, [ $self->_sqlcase('values') ], [ $self->render_aqt($v_aqt) ];
 
   if ($options->{returning}) {
     push @parts, [ $self->_insert_returning($options) ];
@@ -1049,17 +1048,6 @@ sub _expand_bind {
   return { -bind => $bind };
 }
 
-sub _expand_values {
-  my ($self, undef, $values) = @_;
-  return { -values => [
-    map +(
-      ref($_) eq 'HASH'
-        ? $self->expand_expr($_)
-        : +{ -row => [ map $self->expand_expr($_), @$_ ] }
-    ), ref($values) eq 'ARRAY' ? @$values : $values
-  ] };
-}
-
 sub _recurse_where {
   my ($self, $where, $logic) = @_;
 
@@ -1095,16 +1083,6 @@ sub _render_row {
   return "($sql)", @bind;  
 }
 
-sub _render_values {
-  my ($self, $values) = @_;
-  my ($sql, @bind) = $self->_join_parts(
-    ', ',
-    map [ $self->render_aqt($_) ],
-      ref($values) eq 'ARRAY' ? @$values : $values
-  );
-  return $self->_sqlcase('values ').$sql, @bind;
-}
-
 sub _render_func {
   my ($self, $rest) = @_;
   my ($func, @args) = @$rest;
diff --git a/lib/SQL/Abstract/Clauses.pm b/lib/SQL/Abstract/Clauses.pm
index 86f74b9..4900dfa 100644
--- a/lib/SQL/Abstract/Clauses.pm
+++ b/lib/SQL/Abstract/Clauses.pm
@@ -67,8 +67,10 @@ sub register_defaults {
     ($self->_sqlcase('insert into ').$sql, @bind);
   };
   $self->{render_clause}{'insert.from'} = sub {
-    return $_[0]->render_aqt($_[1]);
+    return $_[0]->render_aqt($_[1], 1);
   };
+  $self->{expand}{values} = '_expand_values';
+  $self->{render}{values} = '_render_values';
   return $self;
 }
 
@@ -149,7 +151,7 @@ sub _render_statement {
       if (my $rdr = $self->{render_clause}{"${type}.${clause}"}) {
         $self->$rdr($clause_expr);
       } else {
-        my ($clause_sql, @bind) = $self->render_aqt($clause_expr);
+        my ($clause_sql, @bind) = $self->render_aqt($clause_expr, 1);
         my $sql = join ' ',
           $self->_sqlcase(join ' ', split '_', $clause),
           $clause_sql;
@@ -159,13 +161,31 @@ sub _render_statement {
     next unless defined($sql) and length($sql);
     push @parts, \@part;
   }
-  return $self->_join_parts(' ', @parts);
+  my ($sql, @bind) = $self->_join_parts(' ', @parts);
+  return (
+    (our $Render_Top_Level ? $sql : '('.$sql.')'),
+    @bind
+  );
+}
+
+sub render_aqt {
+  my ($self, $aqt, $top_level) = @_;
+  local our $Render_Top_Level = $top_level;
+  return $self->next::method($aqt);
+}
+
+sub render_statement {
+  my ($self, $expr, $default_scalar_to) = @_;
+  my ($sql, @bind) = $self->render_aqt(
+    $self->expand_expr($expr, $default_scalar_to), 1
+  );
+  return (wantarray ? ($sql, @bind) : $sql);
 }
 
 sub select {
   my ($self, @args) = @_;
 
-  return $self->render_expr({ -select => $_[1] }) if ref($_[1]) eq 'HASH';
+  return $self->render_statement({ -select => $_[1] }) if ref($_[1]) eq 'HASH';
 
   my %clauses;
   @clauses{qw(from select where order_by)} = @args;
@@ -176,38 +196,38 @@ sub select {
   $clauses{select} = { -literal => [ $clauses{select}||'*' ] }
     unless ref($clauses{select});
 
-  return $self->render_expr({ -select => \%clauses });
+  return $self->render_statement({ -select => \%clauses });
 }
 
 sub update {
   my ($self, $table, $set, $where, $options) = @_;
 
-  return $self->render_expr({ -update => $_[1] }) if ref($_[1]) eq 'HASH';
+  return $self->render_statement({ -update => $_[1] }) if ref($_[1]) eq 'HASH';
 
   my %clauses;
   @clauses{qw(target set where)} = ($table, $set, $where);
   puke "Unsupported data type specified to \$sql->update"
     unless ref($clauses{set}) eq 'HASH';
   @clauses{keys %$options} = values %$options;
-  return $self->render_expr({ -update => \%clauses });
+  return $self->render_statement({ -update => \%clauses });
 }
 
 sub delete {
   my ($self, $table, $where, $options) = @_;
 
-  return $self->render_expr({ -delete => $_[1] }) if ref($_[1]) eq 'HASH';
+  return $self->render_statement({ -delete => $_[1] }) if ref($_[1]) eq 'HASH';
 
   my %clauses = (target => $table, where => $where, %{$options||{}});
-  return $self->render_expr({ -delete => \%clauses });
+  return $self->render_statement({ -delete => \%clauses });
 }
 
 sub insert {
   my ($self, $table, $data, $options) = @_;
 
-  return $self->render_expr({ -insert => $_[1] }) if ref($_[1]) eq 'HASH';
+  return $self->render_statement({ -insert => $_[1] }) if ref($_[1]) eq 'HASH';
 
   my %clauses = (target => $table, values => $data, %{$options||{}});
-  return $self->render_expr({ -insert => \%clauses });
+  return $self->render_statement({ -insert => \%clauses });
 }
 
 sub _expand_insert_clause_target {
@@ -224,4 +244,30 @@ sub _expand_insert_clause_values {
   return (from => { -values => $v_aqt }, ($f_aqt ? (fields => $f_aqt) : ()));
 }
 
+sub _expand_values {
+  my ($self, undef, $values) = @_;
+  return { -values => [
+    map +(
+      ref($_) eq 'HASH'
+        ? $self->expand_expr($_)
+        : +{ -row => [ map $self->expand_expr($_), @$_ ] }
+    ), ref($values) eq 'ARRAY' ? @$values : $values
+  ] };
+}
+
+sub _render_values {
+  my ($self, $values) = @_;
+  my ($v_sql, @bind) = $self->_join_parts(
+    ', ',
+    map [ $self->render_aqt($_) ],
+      ref($values) eq 'ARRAY' ? @$values : $values
+  );
+  my $sql = $self->_sqlcase('values').' '.$v_sql;
+  return (
+    (our $Render_Top_Level ? $sql : '('.$sql.')'),
+    @bind
+  );
+}
+
+
 1;
diff --git a/lib/SQL/Abstract/ExtraClauses.pm b/lib/SQL/Abstract/ExtraClauses.pm
index e668de8..47f8607 100644
--- a/lib/SQL/Abstract/ExtraClauses.pm
+++ b/lib/SQL/Abstract/ExtraClauses.pm
@@ -139,9 +139,7 @@ sub _render_as {
   my ($thing, $as, @cols) = @$args;
   return $self->_join_parts(
     ' ',
-    [ $self->render_aqt(
-        map +($_->{-ident} ? $_ : { -row => [ $_ ] }), $thing
-    ) ],
+    [ $self->render_aqt($thing) ],
     [ $self->_sqlcase('as') ],
     (@cols
       ? [ $self->_join_parts('',