has sqla => (
is => 'ro', init_arg => undef,
handles => [ qw(
- expand_expr expand_maybe_list_expr render_aqt
- format_keyword join_query_parts
+ expand_expr expand_maybe_list_expr render_aqt join_query_parts
) ],
);
sub cb {
- my ($self, $method) = @_;
- return sub { local $self->{sqla} = shift; $self->$method(@_) };
+ my ($self, $method, @args) = @_;
+ return sub {
+ local $self->{sqla} = shift;
+ $self->$method(@args, @_)
+ };
+}
+
+sub register {
+ my ($self, @pairs) = @_;
+ my $sqla = $self->sqla;
+ while (my ($method, $cases) = splice(@pairs, 0, 2)) {
+ my @cases = @$cases;
+ while (my ($name, $case) = splice(@cases, 0, 2)) {
+ $sqla->$method($name, $self->cb($case));
+ }
+ }
+ return $self;
}
sub apply_to {
my ($self, $sqla) = @_;
$self = $self->new unless ref($self);
+ local $self->{sqla} = $sqla;
+ $self->register_extensions($sqla);
+}
+
+sub register_extensions {
+ my ($self, $sqla) = @_;
my @clauses = $sqla->clauses_of('select');
my @before_setop;
CLAUSE: foreach my $idx (0..$#clauses) {
}
die "Huh?" unless @before_setop;
$sqla->clauses_of(select => 'with', @clauses);
- $sqla->clause_expanders(
- 'select.group_by', $self->cb(sub {
- $_[0]->expand_maybe_list_expr($_[2], -ident)
- }),
- 'select.having', $self->cb(sub { $_[0]->expand_expr($_[2]) }),
+ $self->register(
+ clause_expanders => [
+ 'select.group_by'
+ => sub { $_[0]->expand_maybe_list_expr($_[2], -ident) },
+ 'select.having'
+ => sub { $_[0]->expand_expr($_[2]) },
+ ],
+ (map +(
+ "${_}er" => [
+ do {
+ my $x = $_;
+ (map +($_ => "_${x}_${_}"), qw(join from_list alias))
+ }
+ ]
+ ), qw(expand render)),
+ binop_expander => [ as => '_expand_op_as' ],
+ renderer => [ as => '_render_as' ],
+ expander => [ cast => '_expand_cast' ],
);
- foreach my $thing (qw(join from_list)) {
- $sqla->expander($thing => $self->cb("_expand_${thing}"))
- ->renderer($thing => $self->cb("_render_${thing}"))
- }
- $sqla->op_expander(as => $self->cb('_expand_op_as'));
- $sqla->expander(as => $self->cb('_expand_op_as'));
- $sqla->renderer(as => $self->cb('_render_as'));
- $sqla->expander(alias => $self->cb('_expand_alias'));
- $sqla->renderer(alias => $self->cb('_render_alias'));
$sqla->clauses_of(update => sub {
my ($self, @clauses) = @_;
});
$sqla->clause_expanders(
- 'update.from' => $self->cb('_expand_select_clause_from'),
- 'delete.using' => $self->cb(sub {
- +(using => $_[0]->_expand_from_list(undef, $_[2]));
- }),
+ 'update.from' => $self->cb('_expand_from_list'),
+ 'delete.using' => $self->cb('_expand_from_list'),
'insert.rowvalues' => $self->cb(sub {
+(from => $_[0]->expand_expr({ -values => $_[2] }));
}),
# set ops
$sqla->wrap_expander(select => sub {
- my $orig = shift;
- $self->cb(sub {
- my $self = shift;
- my $exp = $self->sqla->$orig(@_);
- return $exp unless my $setop = (my $sel = $exp->{-select})->{setop};
- if (my @keys = grep $sel->{$_}, @before_setop) {
- my %inner; @inner{@keys} = delete @{$sel}{@keys};
- unshift @{(values(%$setop))[0]{queries}},
- { -select => \%inner };
- }
- return $exp;
- });
+ $self->cb('_expand_select', $_[0], \@before_setop);
});
- $sqla->clause_renderer('select.setop' => $self->cb(sub {
- my ($self, undef, $setop) = @_;
- $self->render_aqt($setop);
- }));
+ $sqla->clause_renderer(
+ 'select.setop' => $self->cb(sub { $_[0]->render_aqt($_[2]); })
+ );
foreach my $setop (qw(union intersect except)) {
$sqla->expander($setop => $self->cb('_expand_setop'));
$sqla->clause_renderer("${stmt}.with" => $w_rdr);
}
- $sqla->expander(cast => $self->cb('_expand_cast'));
-
$sqla->clause_expanders(
- "select.from", $self->cb('_expand_select_clause_from'),
+ "select.from", $self->cb('_expand_from_list'),
"update.target", $self->cb('_expand_update_clause_target'),
"update.update", $self->cb('_expand_update_clause_target'),
);
return $sqla;
}
-sub _expand_select_clause_from {
- my ($self, undef, $from) = @_;
- +(from => $self->_expand_from_list(undef, $from));
+sub _expand_select {
+ my ($self, $orig, $before_setop, @args) = @_;
+ my $exp = $self->sqla->$orig(@args);
+ return $exp unless my $setop = (my $sel = $exp->{-select})->{setop};
+ if (my @keys = grep $sel->{$_}, @$before_setop) {
+ my %inner; @inner{@keys} = delete @{$sel}{@keys};
+ unshift @{(values(%$setop))[0]{queries}},
+ { -select => \%inner };
+ }
+ return $exp;
}
sub _expand_from_list {
my @parts = (
$args->{from},
- $self->format_keyword(join '_', ($args->{type}||()), 'join'),
+ { -keyword => join '_', ($args->{type}||()), 'join' },
(map +($_->{-ident} || $_->{-as} ? $_ : ('(', $_, ')')), $args->{to}),
($args->{on} ? (
- $self->format_keyword('on') ,
+ { -keyword => 'on' },
$args->{on},
) : ()),
($args->{using} ? (
- $self->format_keyword('using'),
+ { -keyword => 'using' },
'(', $args->{using}, ')',
) : ()),
);
sub _expand_op_as {
my ($self, undef, $vv, $k) = @_;
my @vv = (ref($vv) eq 'ARRAY' ? @$vv : $vv);
- $k ||= shift @vv;
my $ik = $self->expand_expr($k, -ident);
return +{ -as => [ $ik, $self->expand_expr($vv[0], -alias) ] }
if @vv == 1 and ref($vv[0]) eq 'HASH';
return $self->join_query_parts(
' ',
$thing,
- $self->format_keyword('as'),
+ { -keyword => 'as' },
$alias,
);
}
my ($alias, $query) = @$_;
$self->join_query_parts(' ',
$alias,
- $self->format_keyword('as'),
+ { -keyword => 'as' },
$query,
)
} @{$with->{queries}}
);
return $self->join_query_parts(' ',
- $self->format_keyword(join '_', 'with', ($with->{type}||'')),
+ { -keyword => join '_', 'with', ($with->{type}||'') },
$q_part,
);
}
sub _render_setop {
my ($self, $setop, $args) = @_;
$self->join_query_parts(
- ' '.$self->format_keyword(join '_', $setop, ($args->{type}||())).' ',
+ { -keyword => ' '.join('_', $setop, ($args->{type}||())).' ' },
@{$args->{queries}}
);
}
}
1;
+
+__END__
+
+=head1 NAME
+
+SQL::Abstract::ExtraClauses - new/experimental additions to L<SQL::Abstract>
+
+=head1 SYNOPSIS
+
+ my $sqla = SQL::Abstract->new;
+ SQL::Abstract::ExtraClauses->apply_to($sqla);
+
+=head1 METHODS
+
+=head2 apply_to
+
+Applies the plugin to an L<SQL::Abstract> object.
+
+=head2 cb
+
+For plugin authors, creates a callback to call a method on the plugin.
+
+=head2 sqla
+
+Available only during plugin callback executions, contains the currently
+active L<SQL::Abstract> object.
+
+=head1 NODE TYPES
+
+=head2 alias
+
+Represents a table alias. Expands name and column names with ident as default.
+
+ # expr
+ { -alias => [ 't', 'x', 'y', 'z' ] }
+
+ # aqt
+ { -alias => [
+ { -ident => [ 't' ] }, { -ident => [ 'x' ] },
+ { -ident => [ 'y' ] }, { -ident => [ 'z' ] },
+ ] }
+
+ # query
+ t(x, y, z)
+ []
+
+=head2 as
+
+Represents an sql AS. LHS is expanded with ident as default, RHS is treated
+as a list of arguments for the alias node.
+
+ # expr
+ { foo => { -as => 'bar' } }
+
+ # aqt
+ { -as =>
+ [
+ { -ident => [ 'foo' ] },
+ { -alias => [ { -ident => [ 'bar' ] } ] },
+ ]
+ }
+
+ # query
+ foo AS bar
+ []
+
+ # expr
+ { -as => [ { -select => { _ => 'blah' } }, 't', 'blah' ] }
+
+ # aqt
+ { -as => [
+ { -select =>
+ { select => { -op => [ ',', { -ident => [ 'blah' ] } ] } }
+ },
+ { -alias => [ { -ident => [ 't' ] }, { -ident => [ 'blah' ] } ] },
+ ] }
+
+ # query
+ (SELECT blah) AS t(blah)
+ []
+
+=head2 cast
+
+ # expr
+ { -cast => [ { -ident => 'birthday' }, 'date' ] }
+
+ # aqt
+ { -func => [
+ 'cast', {
+ -as => [ { -ident => [ 'birthday' ] }, { -ident => [ 'date' ] } ]
+ },
+ ] }
+
+ # query
+ CAST(birthday AS date)
+ []
+
+=cut
projects / scpubgit/Q-Branch.git / blobdiff