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/;
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 between => $self->can('_between'),
23 not_between => $self->can('_between'),
24 and => $self->can('_recurse_where'),
25 or => $self->can('_recurse_where'),
26 map { +"$_" => $self->can("_$_") } qw/
36 method _select(AST $ast) {
37 # Default to requiring columns and from.
38 # DB specific ones (i.e. mysql/Pg) can not require the FROM part with a bit
41 for (qw/columns tablespec/) {
42 confess "'$_' is required in select AST with " . dump ($ast)
43 unless exists $ast->{$_};
46 # Check that columns is a -list
47 confess "'columns' should be an array ref, not " . dump($ast->{columns})
48 unless is_ArrayRef($ast->{columns});
50 my $cols = $self->_list({-type => 'list', args => $ast->{columns} });
56 push @output, FROM => $self->dispatch($ast->{tablespec})
57 if exists $ast->{tablespec};
59 if (exists $ast->{where}) {
60 my $sub_ast = $ast->{where};
62 confess "$_ option is not an AST: " . dump($sub_ast)
63 unless is_AST($sub_ast);
65 push @output, "WHERE", $self->_expr($sub_ast);
68 for (qw/group_by having order_by/) {
69 if (exists $ast->{$_}) {
70 my $sub_ast = $ast->{$_};
72 confess "$_ option is not an AST or an ArrayRef: " . dump($sub_ast)
73 unless is_AST($sub_ast) || is_ArrayRef($sub_ast);;
76 push @output, $self->$meth($sub_ast);
80 return join(' ', @output);
83 method _update(AST $ast) {
85 for (qw/columns values tablespec/) {
86 confess "'$_' is required in update AST with " . dump ($ast)
87 unless exists $ast->{$_};
92 method _join(HashRef $ast) {
94 # TODO: Validate join type
95 my $type = $ast->{join_type} || "";
97 my @output = $self->dispatch($ast->{lhs});
99 push @output, uc $type if $type;
100 push @output, "JOIN", $self->dispatch($ast->{rhs});
104 ? ('ON', '(' . $self->_expr( $ast->{on} ) . ')' )
105 : ('USING', '(' .$self->dispatch($ast->{using}
106 || croak "No 'on' or 'uinsg' clause passed to join cluase: " .
111 return join(" ", @output);
115 method _ordering(AST $ast) {
117 my $output = $self->_expr($ast->{expr});
119 $output .= " " . uc $1
120 if $ast->{direction} &&
121 ( $ast->{direction} =~ /^(asc|desc)$/i
122 || confess "Unknown ordering direction " . dump($ast)
128 method _identifier(AST $ast) {
129 my @names = @{$ast->{elements}};
131 my $sep = $self->ident_separator;
132 my $quote = $self->is_quoting
136 my $join = $quote->[-1] . $sep . $quote->[0];
138 # We dont want to quote * in [qw/me */]: `me`.* is the desired output there
139 # This means you can't have a field called `*`. I am willing to accept this
140 # situation, cos thats a really stupid thing to want.
142 $post = pop @names if $names[-1] eq '*';
146 join( $join, @names ) .
151 ? $ret . $sep . $post
160 method _list(AST $ast) {
161 return "" unless $ast->{args};
163 my @items = is_ArrayRef($ast->{args})
168 $self->list_separator,
169 map { $self->dispatch($_) } @items);
172 # TODO: I think i want to parameterized AST type to get better validation
173 method _alias(AST $ast) {
175 # TODO: Maybe we want qq{ AS "$as"} here
176 return $self->dispatch($ast->{ident}) . " AS " . $ast->{as};
180 method _value(AST $ast) {
182 $self->add_bind($ast->{value});
186 # Not dispatchable to.
187 method __having($args) {
188 return "HAVING " . $self->_list({-type => 'list', args => $args});
191 method __group_by($args) {
192 return "GROUP BY " . $self->_list({-type => 'list', args => $args});
195 method __order_by($args) {
196 return "ORDER BY " . $self->_list({-type => 'list', args => $args});
200 # Perhaps badly named. handles 'and' and 'or' clauses
201 method _recurse_where(AST $ast) {
206 my $prio = $SQL::Abstract::PRIO{$op};
208 my $dispatch_table = $self->expr_dispatch_table;
211 foreach ( @{$ast->{args}} ) {
212 croak "invalid component in where clause: $_" unless is_AST($_);
214 if ($_->{-type} eq 'expr' && $_->{op} =~ /^(and|or)$/) {
215 my $sub_prio = $SQL::Abstract::PRIO{$1};
217 if ($sub_prio == $prio) {
218 # When the element below has same priority, i.e. 'or' as a child of
219 # 'or', dont produce extra brackets
220 push @output, $self->_recurse_where($_);
222 push @output, '(' . $self->_recurse_where($_) . ')';
225 push @output, $self->_expr($_);
229 return join(" $OP ", @output);
232 method _expr(AST $ast) {
233 my $op = $ast->{-type};
235 $op = $ast->{op} if $op eq 'expr';
237 if (my $code = $self->lookup_expr_dispatch($op)) {
239 return $code->($self, $ast);
242 croak "'$op' is not a valid AST type in an expression with " . dump($ast)
243 if $ast->{-type} ne 'expr';
245 # This is an attempt to do some form of validation on function names. This
246 # might end up being a bad thing.
247 croak "'$op' is not a valid operator in an expression with " . dump($ast)
250 return $self->_generic_function_op($ast);
254 method _binop(AST $ast) {
255 my ($lhs, $rhs) = @{$ast->{args}};
259 if ($rhs->{-type} eq 'value' && !defined $rhs->{value} &&
260 ($op eq '==' || $op eq '!='))
262 return $self->_expr($lhs) .
263 ($op eq '==' ? " IS " : " IS NOT ") .
267 join (' ', $self->_expr($lhs),
268 $self->binop_mapping($op) || croak("Unknown binary operator $op"),
273 method _generic_function_op(AST $ast) {
276 return "$op(" . $self->_list($ast) . ")";
279 method _in(AST $ast) {
281 my ($field,@values) = @{$ast->{args}};
283 my $not = ($ast->{op} =~ /^not_/) ? " NOT" : "";
285 return $self->_false unless @values;
287 return $self->_expr($field) .
290 join(", ", map { $self->dispatch($_) } @values ) .
294 method _between(AST $ast) {
296 my ($field,@values) = @{$ast->{args}};
298 my $not = ($ast->{op} =~ /^not_/) ? " NOT" : "";
299 croak "between requires 3 arguments: " . dump($ast)
302 # The brackets are to work round an issue with SQL::A::Test
304 $self->_expr($field) .
307 join(" AND ", map { $self->dispatch($_) } @values ) .
311 # 'constants' that are portable across DBs
312 method _false($ast?) { "0 = 1" }
313 method _true($ast?) { "1 = 1" }