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) {
73 # TODO: Validate join type
74 my $type = $ast->{join_type} || "";
76 my @output = $self->dispatch($ast->{lhs});
78 push @output, uc $type if $type;
79 push @output, "JOIN", $self->dispatch($ast->{rhs});
83 ? ('ON', '(' . $self->_expr( $ast->{on} ) . ')' )
84 : ('USING', '(' .$self->dispatch($ast->{using} || croak "No 'on' or 'join' clause passed to -join").
87 return join(" ", @output);
91 method _order_by(AST $ast) {
92 my @clauses = @{$ast->{order_by}};
97 if (is_ArrayRef($_) && $_->[0] =~ /^-(asc|desc)$/) {
99 push @output, $self->dispatch($_->[1]) . " " . uc($o);
102 push @output, $self->dispatch($_);
105 return "ORDER BY " . join(", ", @output);
108 method _name(HashAST $ast) {
109 my @names = @{$ast->{args}};
111 my $sep = $self->name_separator;
112 my $quote = $self->is_quoting
116 my $join = $quote->[-1] . $sep . $quote->[0];
118 # We dont want to quote * in [qw/me */]: `me`.* is the desired output there
119 # This means you can't have a field called `*`. I am willing to accept this
120 # situation, cos thats a really stupid thing to want.
122 $post = pop @names if $names[-1] eq '*';
126 join( $join, @names ) .
129 $ret .= $sep . $post if defined $post;
134 method _list(AST $ast) {
135 my @items = @{$ast->{args}};
138 $self->list_separator,
139 map { $self->dispatch($_) } @items);
142 # TODO: I think i want to parameterized AST type to get better validation
143 method _alias(AST $ast) {
145 # TODO: Maybe we want qq{ AS "$as"} here
146 return $self->dispatch($ast->{ident}) . " AS " . $ast->{as};
150 method _value(HashAST $ast) {
152 $self->add_bind($ast->{value});
156 # Perhaps badly named. handles 'and' and 'or' clauses
157 method _recurse_where(HashAST $ast) {
162 my $prio = $SQL::Abstract::PRIO{$op};
164 my $dispatch_table = $self->expr_dispatch_table;
167 foreach ( @{$ast->{args}} ) {
168 croak "invalid component in where clause: $_" unless is_HashAST($_);
170 if ($_->{-type} eq 'expr' && $_->{op} =~ /^(and|or)$/) {
171 my $sub_prio = $SQL::Abstract::PRIO{$1};
173 if ($sub_prio <= $prio) {
174 push @output, $self->_recurse_where($_);
176 push @output, '(' . $self->_recurse_where($_) . ')';
179 push @output, $self->_expr($_);
183 return join(" $OP ", @output);
186 method _expr(HashAST $ast) {
187 my $op = $ast->{-type};
189 $op = $ast->{op} if $op eq 'expr';
191 if (my $code = $self->lookup_expr_dispatch($op)) {
193 return $code->($self, $ast);
196 croak "'$op' is not a valid AST type in an expression with " . dump($ast)
197 if $ast->{-type} ne 'expr';
199 croak "'$op' is not a valid operator in an expression with " . dump($ast);
203 method _binop(HashAST $ast) {
204 my ($lhs, $rhs) = @{$ast->{args}};
207 join (' ', $self->_expr($lhs),
208 $self->binop_mapping($op) || croak("Unknown binary operator $op"),
213 method _in(HashAST $ast) {
215 my ($field,@values) = @{$ast->{args}};
217 my $not = ($ast->{op} =~ /^not_/) ? " NOT" : "";
219 return $self->_false unless @values;
221 return $self->_expr($field) .
224 join(", ", map { $self->dispatch($_) } @values ) .
228 method _generic_func(ArrayRef $ast) {
231 # 'constants' that are portable across DBs
232 method _false($ast?) { "0 = 1" }
233 method _true($ast?) { "1 = 1" }