3 class SQL::Abstract::AST::v1 extends SQL::Abstract {
8 use Moose::Util::TypeConstraints;
9 use MooseX::Types::Moose qw/ArrayRef Str Int Ref HashRef/;
10 use MooseX::AttributeHelpers;
11 use SQL::Abstract::Types qw/AST ArrayAST HashAST/;
12 use Devel::PartialDump qw/dump/;
16 # set things that are valid in where clauses
17 override _build_expr_dispatch_table {
20 in => $self->can('_in'),
21 not_in => $self->can('_in'),
22 and => $self->can('_recurse_where'),
23 or => $self->can('_recurse_where'),
24 map { +"$_" => $self->can("_$_") } qw/
34 method _select(HashAST $ast) {
35 # Default to requiring columns and from.
36 # DB specific ones (i.e. mysql/Pg) can not require the FROM part with a bit
39 for (qw/columns tablespec/) {
40 confess "'$_' is required in select AST with " . dump ($ast)
41 unless exists $ast->{$_};
44 # Check that columns is a -list
45 confess "'columns' should be an array ref, not " . dump($ast->{columns})
46 unless is_ArrayRef($ast->{columns});
48 my $cols = $self->_list({-type => 'list', args => $ast->{columns} });
54 push @output, FROM => $self->dispatch($ast->{tablespec})
55 if exists $ast->{tablespec};
58 if (exists $ast->{$_}) {
59 my $sub_ast = $ast->{$_};
60 $sub_ast->{-type} = "$_" if is_HashRef($sub_ast);
61 confess "$_ option is not an AST"
62 unless is_AST($sub_ast);
64 push @output, $self->dispatch($sub_ast);
68 return join(' ', @output);
71 method _join(HashRef $ast) {
72 confess "'args' option to join should be an array ref, not " . dump($ast->{args})
73 unless is_ArrayRef($ast->{args});
75 my ($from, $to) = @{ $ast->{args} };
77 # TODO: Validate join type
78 my $type = $ast->{join_type} || "";
80 my @output = $self->dispatch($from);
82 push @output, uc $type if $type;
83 push @output, "JOIN", $self->dispatch($to);
87 ? ('ON', '(' . $self->_expr( $ast->{on} ) . ')' )
88 : ('USING', '(' .$self->dispatch($ast->{using} || croak "No 'on' or 'join' clause passed to -join").
91 return join(" ", @output);
95 method _order_by(AST $ast) {
96 my @clauses = @{$ast->{order_by}};
101 if (is_ArrayRef($_) && $_->[0] =~ /^-(asc|desc)$/) {
103 push @output, $self->dispatch($_->[1]) . " " . uc($o);
106 push @output, $self->dispatch($_);
109 return "ORDER BY " . join(", ", @output);
112 method _name(HashAST $ast) {
113 my @names = @{$ast->{args}};
115 my $sep = $self->name_separator;
116 my $quote = $self->is_quoting
120 my $join = $quote->[-1] . $sep . $quote->[0];
122 # We dont want to quote * in [qw/me */]: `me`.* is the desired output there
123 # This means you can't have a field called `*`. I am willing to accept this
124 # situation, cos thats a really stupid thing to want.
126 $post = pop @names if $names[-1] eq '*';
130 join( $join, @names ) .
133 $ret .= $sep . $post if defined $post;
138 method _list(AST $ast) {
139 my @items = @{$ast->{args}};
142 $self->list_separator,
143 map { $self->dispatch($_) } @items);
146 # TODO: I think i want to parameterized AST type to get better validation
147 method _alias(AST $ast) {
149 # TODO: Maybe we want qq{ AS "$as"} here
150 return $self->dispatch($ast->{ident}) . " AS " . $ast->{as};
154 method _value(HashAST $ast) {
156 $self->add_bind($ast->{value});
160 # Perhaps badly named. handles 'and' and 'or' clauses
161 method _recurse_where(HashAST $ast) {
166 my $prio = $SQL::Abstract::PRIO{$op};
168 my $dispatch_table = $self->expr_dispatch_table;
171 foreach ( @{$ast->{args}} ) {
172 croak "invalid component in where clause: $_" unless is_HashAST($_);
174 if ($_->{-type} eq 'expr' && $_->{op} =~ /^(and|or)$/) {
175 my $sub_prio = $SQL::Abstract::PRIO{$1};
177 if ($sub_prio <= $prio) {
178 push @output, $self->_recurse_where($_);
180 push @output, '(' . $self->_recurse_where($_) . ')';
183 push @output, $self->_expr($_);
187 return join(" $OP ", @output);
190 method _expr(HashAST $ast) {
191 my $op = $ast->{-type};
193 $op = $ast->{op} if $op eq 'expr';
195 if (my $code = $self->lookup_expr_dispatch($op)) {
197 return $code->($self, $ast);
200 croak "'$op' is not a valid AST type in an expression with " . dump($ast)
201 if $ast->{-type} ne 'expr';
203 croak "'$op' is not a valid operator in an expression with " . dump($ast);
207 method _binop(HashAST $ast) {
208 my ($lhs, $rhs) = @{$ast->{args}};
211 join (' ', $self->_expr($lhs),
212 $self->binop_mapping($op) || croak("Unknown binary operator $op"),
217 method _in(HashAST $ast) {
219 my ($field,@values) = @{$ast->{args}};
221 my $not = ($ast->{op} =~ /^not_/) ? " NOT" : "";
223 return $self->_false unless @values;
225 return $self->_expr($field) .
228 join(", ", map { $self->dispatch($_) } @values ) .
232 method _generic_func(ArrayRef $ast) {
235 # 'constants' that are portable across DBs
236 method _false($ast?) { "0 = 1" }
237 method _true($ast?) { "1 = 1" }