1 package Data::Query::Renderer::SQL::Naive;
5 sub intersperse { my $i = shift; my @i = map +($_, $i), @_; pop @i; @i }
7 use SQL::ReservedWords;
8 use Data::Query::ExprHelpers;
12 has reserved_ident_parts => (
13 is => 'ro', default => sub {
14 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
18 has quote_chars => (is => 'ro', default => sub { [''] });
20 has identifier_sep => (is => 'ro', default => sub { '.' });
22 has simple_ops => (is => 'ro', builder => '_default_simple_ops');
24 has lc_keywords => (is => 'ro', default => sub { 0 });
26 has always_quote => (is => 'ro', default => sub { 0 });
28 has collapse_aliases => (is => 'ro', default => sub { 1 });
30 sub _default_simple_ops {
32 (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ),
33 (map +($_ => 'unop'), qw(NOT) ),
34 (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')),
35 (map +($_ => 'flatten'), qw(AND OR) ),
36 (map +($_ => 'in'), ('IN', 'NOT IN')),
37 (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')),
44 $self->_flatten_structure($self->_render(@_))
47 sub _flatten_structure {
48 my ($self, $struct) = @_;
54 elsif ($r eq 'ARRAY') {
55 my ($sql, @b) = @{$self->_flatten_structure($_)};
59 elsif ($r eq 'HASH') { push @bind, $_; () }
60 else { die "_flatten_structure can't handle ref type $r for $_" }
63 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
70 # I presented this to permit strange people to easily supply a patch to lc()
71 # their keywords, as I have heard many desire to do, lest they infect me
72 # with whatever malady caused this desire by their continued proximity for
73 # want of such a feature.
75 # Then I realised that SQL::Abstract compatibility work required it.
79 sub _format_keyword { $_[0]->lc_keywords ? lc($_[1]) : $_[1] }
82 unless (ref($_[1]) eq 'HASH') {
83 die "Expected hashref, got ".(defined($_[1])?$_[1]:'undef');
85 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
90 require Data::Dumper::Concise;
91 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
94 sub _render_identifier {
95 die "Unidentified identifier (SQL can no has \$_)"
96 unless my @i = @{$_[1]->{elements}};
97 # handle single or paired quote chars
98 my ($q1, $q2) = @{$_[0]->quote_chars}[0,-1];
99 my $always_quote = $_[0]->always_quote;
100 my $res_check = $_[0]->reserved_ident_parts;
103 $_[0]->identifier_sep,
105 $_ eq '*' # Yes, this means you can't have a column just called '*'.
106 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
107 : ( # reserved are stored uc, quote if non-word
108 ($always_quote and $q1) || $res_check->{+uc} || /\W/
120 sub _operator_type { 'SQL.Naive' }
122 sub _render_operator {
123 my ($self, $dq) = @_;
124 my $op = $dq->{operator};
125 unless (exists $op->{$self->_operator_type}) {
126 $op->{$self->_operator_type} = $self->_convert_op($dq);
128 my $op_name = $op->{$self->_operator_type};
129 if (my $op_type = $self->simple_ops->{$op_name}) {
130 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
131 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
132 return $self->$meth($dq);
134 if (my $argc = @{$dq->{args}}) {
136 return $self->_handle_op_type_unop($op_name, $dq);
137 } elsif ($argc == 2) {
138 return $self->_handle_op_type_binop($op_name, $dq);
141 die "Unsure how to handle ${op_name}";
144 sub _maybe_parenthesise {
145 my ($self, $dq) = @_;
147 return is_Select() || is_Group() || is_Slice() || is_Having()
148 ? [ '(', $self->_render($dq), ')' ]
149 : $self->_render($dq);
153 sub _handle_op_type_binop {
154 my ($self, $op_name, $dq) = @_;
155 die "${op_name} registered as binary op but args contain "
156 .scalar(@{$dq->{args}})." entries"
157 unless @{$dq->{args}} == 2;
159 $self->_maybe_parenthesise($dq->{args}[0]),
161 $self->_maybe_parenthesise($dq->{args}[1]),
165 sub _handle_op_type_unop {
166 my ($self, $op_name, $dq) = @_;
167 die "${op_name} registered as unary op but args contain "
168 .scalar(@{$dq->{args}})." entries"
169 unless @{$dq->{args}} == 1;
173 $self->_render($dq->{args}[0]),
178 sub _handle_op_type_unop_reverse {
179 my ($self, $op_name, $dq) = @_;
180 die "${op_name} registered as unary op but args contain "
181 .scalar(@{$dq->{args}})." entries"
182 unless @{$dq->{args}} == 1;
184 $self->_render($dq->{args}[0]),
189 sub _handle_op_type_flatten {
190 my ($self, $op_name, $dq) = @_;
191 my @argq = @{$dq->{args}};
193 while (my $arg = shift @argq) {
195 unless (is_Operator($arg)) {
196 push @arg_final, $arg;
200 my $op = $arg->{operator};
201 unless (exists $op->{$self->_operator_type}) {
202 $op->{$self->_operator_type} = $self->_convert_op($arg);
205 if ($op->{$self->_operator_type} eq $op_name) {
206 unshift @argq, @{$arg->{args}};
208 push @arg_final, $arg;
213 $self->_format_keyword($op_name),
214 map $self->_maybe_parenthesise($_), @arg_final
220 sub _handle_op_type_in {
221 my ($self, $op, $dq) = @_;
222 my ($lhs, @in) = @{$dq->{args}};
223 [ $self->_render($lhs),
226 intersperse(',', map $self->_render($_), @in),
231 sub _handle_op_type_between {
232 my ($self, $op_name, $dq) = @_;
233 my @args = @{$dq->{args}};
235 my ($lhs, $rhs1, $rhs2) = (map $self->_maybe_parenthesise($_), @args);
236 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
237 } elsif (@args == 2 and is_Literal $args[1]) {
238 my ($lhs, $rhs) = (map $self->_render($_), @args);
239 [ '(', $lhs, $op_name, $rhs, ')' ];
241 die "Invalid args for between: ${\scalar @args} given";
245 sub _handle_op_type_apply {
246 my ($self, $op_name, $dq) = @_;
247 my ($func, @args) = @{$dq->{args}};
248 die "Function name must be identifier"
249 unless is_Identifier $func;
251 # The problem we have here is that built-ins can't be quoted, generally.
252 # I rather wonder if things like MAX(...) need to -not- be handled as
253 # an apply and instead of something else, maybe a parenop type - but
254 # as an explicitly Naive renderer this seems like a reasonable answer.
255 local @{$self}{qw(reserved_ident_parts always_quote)};
256 $self->_render_identifier($func)->[0];
260 intersperse(',', map $self->_maybe_parenthesise($_), @args),
266 my ($self, $dq) = @_;
267 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
269 $_ eq '==' and return '=';
270 $_ eq 'eq' and return '=';
271 $_ eq '!' and return 'NOT';
273 return uc $perl_op; # hope!
275 die "Can't convert non-perl op yet";
279 my ($self, $dq) = @_;
280 die "Empty select list" unless @{$dq->{select}};
282 # it is, in fact, completely valid for there to be nothing for us
283 # to project from since many databases handle 'SELECT 1;' fine
285 my @select = intersperse(',',
287 ? $self->_render_alias($_, $self->_format_keyword('AS'))
288 : $self->_render($_)), @{$dq->{select}}
292 $self->_format_keyword('SELECT'),
294 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
295 # since we're the SELECT and therefore always come first, we don't care.
297 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
304 my ($self, $dq, $as) = @_;
305 # FROM foo foo -> FROM foo
306 # FROM foo.bar bar -> FROM foo.bar
307 if ($self->collapse_aliases) {
308 if (is_Identifier(my $from = $dq->{from})) {
309 if ($from->{elements}[-1] eq $dq->{to}) {
310 return $self->_render($from);
315 $self->_maybe_parenthesise($dq->{from}),
317 $self->_render_identifier({ elements => [ $dq->{to} ] })
321 sub _render_literal {
322 my ($self, $dq) = @_;
323 unless ($dq->{subtype} eq 'SQL') {
324 die "Can't render non-SQL literal";
326 if (defined($dq->{literal})) {
328 $dq->{literal}, @{$dq->{values}||[]}
330 } elsif ($dq->{parts}) {
331 return [ map $self->_render($_), @{$dq->{parts}} ];
333 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
338 my ($self, $dq) = @_;
339 my ($left, $right) = @{$dq}{qw(left right)};
342 $self->_format_keyword(uc($dq->{outer}).' JOIN');
343 } elsif ($dq->{on}) {
344 $self->_format_keyword('JOIN');
349 my $rhs = $self->_render($right);
351 $self->_render($left), $join,
352 (is_Join($right) ? ('(', $rhs, ')') : $rhs),
354 ? ($self->_format_keyword('ON'), $self->_render($dq->{on}))
360 my ($self, $dq) = @_;
361 my ($from, $where) = @{$dq}{qw(from where)};
362 while (is_Where $from) {
363 $where = Operator({ 'SQL.Naive' => 'and' }, [ $where, $from->{where} ]);
364 $from = $from->{from};
366 my $keyword = (is_Group($from) ? 'HAVING' : 'WHERE');
368 ($from ? $self->_render($from) : ()),
369 $self->_format_keyword($keyword),
370 $self->_render($where)
375 my ($self, $dq) = @_;
377 $self->_render($dq->{by}),
379 ? $self->_format_keyword('DESC')
382 ? $self->_format_keyword('NULLS '.('', qw(FIRST LAST))[$dq->{nulls}])
388 my ($self, $dq) = @_;
390 $self->_format_keyword('ORDER BY'),
391 $self->_order_chunk($dq),
394 while ($from = $dq->{from}) {
395 last unless is_Order $from;
399 $self->_order_chunk($dq),
402 unshift @ret, $self->_render($from) if $from;
407 my ($self, $dq) = @_;
408 # this could also squash like order does. but I dunno whether that should
409 # move somewhere else just yet.
411 ($dq->{from} ? $self->_render($dq->{from}) : ()),
414 $self->_format_keyword('GROUP BY'),
415 intersperse(',', map $self->_render($_), @{$dq->{by}})
423 my ($self, $dq) = @_;
424 my ($target, $where) = @{$dq}{qw(target where)};
425 [ $self->_format_keyword('DELETE FROM'),
426 $self->_render($target),
428 ? ($self->_format_keyword('WHERE'), $self->_render($where))
434 my ($self, $dq) = @_;
435 my ($target, $set, $where) = @{$dq}{qw(target set where)};
437 die "Must have set key - names+value keys not yet tested";
438 my ($names, $value) = @{$dq}{qw(names value)};
439 die "Must have names and value or set" unless $names and $value;
440 die "names and value must be same size" unless @$names == @$value;
441 $set = [ map [ $names->[$_], $value->[$_] ], 0..$#$names ];
443 my @rendered_set = intersperse(
444 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
446 [ $self->_format_keyword('UPDATE'),
447 $self->_render($target),
448 $self->_format_keyword('SET'),
451 ? ($self->_format_keyword('WHERE'), $self->_render($where))
457 my ($self, $dq) = @_;
458 my ($target, $names, $values, $returning)
459 = @{$dq}{qw(target names values returning)};
461 die "Must have values key - sets key not yet implemented";
463 [ $self->_format_keyword('INSERT INTO'),
464 $self->_render($target),
466 ? ('(', intersperse(',', map $self->_render($_), @$names), ')')
468 $self->_format_keyword('VALUES'),
470 map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ],
474 ? ($self->_format_keyword('RETURNING'),
475 intersperse(',', map $self->_render($_), @$returning))