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 $ast) {
72 my ($from, $to) = @{ $ast->{args} };
74 my $output = $self->dispatch($from)
76 . $self->dispatch($to);
78 $output .= exists $ast->{on}
79 ? ' ON (' . $self->_expr( $ast->{on} )
80 : ' USING (' .$self->dispatch($ast->{using} || croak "No 'on' or 'join' clause passed to -join");
87 method _order_by(AST $ast) {
88 my @clauses = @{$ast->{order_by}};
93 if (is_ArrayRef($_) && $_->[0] =~ /^-(asc|desc)$/) {
95 push @output, $self->dispatch($_->[1]) . " " . uc($o);
98 push @output, $self->dispatch($_);
101 return "ORDER BY " . join(", ", @output);
104 method _name(HashAST $ast) {
105 my @names = @{$ast->{args}};
107 my $sep = $self->name_separator;
108 my $quote = $self->is_quoting
112 my $join = $quote->[-1] . $sep . $quote->[0];
114 # We dont want to quote * in [qw/me */]: `me`.* is the desired output there
115 # This means you can't have a field called `*`. I am willing to accept this
116 # situation, cos thats a really stupid thing to want.
118 $post = pop @names if $names[-1] eq '*';
122 join( $join, @names ) .
125 $ret .= $sep . $post if defined $post;
130 method _list(AST $ast) {
131 my @items = @{$ast->{args}};
134 $self->list_separator,
135 map { $self->dispatch($_) } @items);
138 # TODO: I think i want to parameterized AST type to get better validation
139 method _alias(AST $ast) {
141 # TODO: Maybe we want qq{ AS "$as"} here
142 return $self->dispatch($ast->{ident}) . " AS " . $ast->{as};
146 method _value(HashAST $ast) {
148 $self->add_bind($ast->{value});
152 # Perhaps badly named. handles 'and' and 'or' clauses
153 method _recurse_where(HashAST $ast) {
158 my $prio = $SQL::Abstract::PRIO{$op};
160 my $dispatch_table = $self->expr_dispatch_table;
163 foreach ( @{$ast->{args}} ) {
164 croak "invalid component in where clause: $_" unless is_HashAST($_);
166 if ($_->{-type} eq 'expr' && $_->{op} =~ /^(and|or)$/) {
167 my $sub_prio = $SQL::Abstract::PRIO{$1};
169 if ($sub_prio <= $prio) {
170 push @output, $self->_recurse_where($_);
172 push @output, '(' . $self->_recurse_where($_) . ')';
175 push @output, $self->_expr($_);
179 return join(" $OP ", @output);
182 method _expr(HashAST $ast) {
183 my $op = $ast->{-type};
185 $op = $ast->{op} if $op eq 'expr';
187 if (my $code = $self->lookup_expr_dispatch($op)) {
189 return $code->($self, $ast);
192 croak "'$op' is not a valid AST type in an expression with " . dump($ast)
193 if $ast->{-type} ne 'expr';
195 croak "'$op' is not a valid operator in an expression with " . dump($ast);
199 method _binop(HashAST $ast) {
200 my ($lhs, $rhs) = @{$ast->{args}};
203 join (' ', $self->_expr($lhs),
204 $self->binop_mapping($op) || croak("Unknown binary operator $op"),
209 method _in(HashAST $ast) {
211 my ($field,@values) = @{$ast->{args}};
213 my $not = ($ast->{op} =~ /^not_/) ? " NOT" : "";
215 return $self->_false unless @values;
217 return $self->_expr($field) .
220 join(", ", map { $self->dispatch($_) } @values ) .
224 method _generic_func(ArrayRef $ast) {
227 # 'constants' that are portable across DBs
228 method _false($ast?) { "0 = 1" }
229 method _true($ast?) { "1 = 1" }