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 die "Expected hashref, got $_[1]" unless ref($_[1]) eq 'HASH';
83 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
88 require Data::Dumper::Concise;
89 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
92 sub _render_identifier {
93 die "Unidentified identifier (SQL can no has \$_)"
94 unless my @i = @{$_[1]->{elements}};
95 # handle single or paired quote chars
96 my ($q1, $q2) = @{$_[0]->quote_chars}[0,-1];
97 my $always_quote = $_[0]->always_quote;
98 my $res_check = $_[0]->reserved_ident_parts;
101 $_[0]->identifier_sep,
103 $_ eq '*' # Yes, this means you can't have a column just called '*'.
104 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
105 : ( # reserved are stored uc, quote if non-word
106 ($always_quote and $q1) || $res_check->{+uc} || /\W/
118 sub _operator_type { 'SQL.Naive' }
120 sub _render_operator {
121 my ($self, $dq) = @_;
122 my $op = $dq->{operator};
123 unless (exists $op->{$self->_operator_type}) {
124 $op->{$self->_operator_type} = $self->_convert_op($dq);
126 my $op_name = $op->{$self->_operator_type};
127 if (my $op_type = $self->simple_ops->{$op_name}) {
128 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
129 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
130 return $self->$meth($dq);
132 if (my $argc = @{$dq->{args}}) {
134 return $self->_handle_op_type_unop($op_name, $dq);
135 } elsif ($argc == 2) {
136 return $self->_handle_op_type_binop($op_name, $dq);
139 die "Unsure how to handle ${op_name}";
142 sub _maybe_parenthesise {
143 my ($self, $dq) = @_;
145 return is_Select() || is_Slice()
146 ? [ '(', $self->_render($dq), ')' ]
147 : $self->_render($dq);
151 sub _handle_op_type_binop {
152 my ($self, $op_name, $dq) = @_;
153 die "${op_name} registered as binary op but args contain "
154 .scalar(@{$dq->{args}})." entries"
155 unless @{$dq->{args}} == 2;
157 $self->_maybe_parenthesise($dq->{args}[0]),
159 $self->_maybe_parenthesise($dq->{args}[1]),
163 sub _handle_op_type_unop {
164 my ($self, $op_name, $dq) = @_;
165 die "${op_name} registered as unary op but args contain "
166 .scalar(@{$dq->{args}})." entries"
167 unless @{$dq->{args}} == 1;
171 $self->_render($dq->{args}[0]),
176 sub _handle_op_type_unop_reverse {
177 my ($self, $op_name, $dq) = @_;
178 die "${op_name} registered as unary op but args contain "
179 .scalar(@{$dq->{args}})." entries"
180 unless @{$dq->{args}} == 1;
182 $self->_render($dq->{args}[0]),
187 sub _handle_op_type_flatten {
188 my ($self, $op_name, $dq) = @_;
189 my @argq = @{$dq->{args}};
191 while (my $arg = shift @argq) {
193 unless (is_Operator($arg)) {
194 push @arg_final, $arg;
198 my $op = $arg->{operator};
199 unless (exists $op->{$self->_operator_type}) {
200 $op->{$self->_operator_type} = $self->_convert_op($arg);
203 if ($op->{$self->_operator_type} eq $op_name) {
204 unshift @argq, @{$arg->{args}};
206 push @arg_final, $arg;
211 $self->_format_keyword($op_name),
212 map $self->_maybe_parenthesise($_), @arg_final
218 sub _handle_op_type_in {
219 my ($self, $op, $dq) = @_;
220 my ($lhs, @in) = @{$dq->{args}};
221 [ $self->_render($lhs),
224 intersperse(',', map $self->_render($_), @in),
229 sub _handle_op_type_between {
230 my ($self, $op_name, $dq) = @_;
231 my @args = @{$dq->{args}};
233 my ($lhs, $rhs1, $rhs2) = (map $self->_maybe_parenthesise($_), @args);
234 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
235 } elsif (@args == 2 and is_Literal $args[1]->{type}) {
236 my ($lhs, $rhs) = (map $self->_render($_), @args);
237 [ '(', $lhs, $op_name, $rhs, ')' ];
239 die "Invalid args for between: ${\scalar @args} given";
243 sub _handle_op_type_apply {
244 my ($self, $op_name, $dq) = @_;
245 my ($func, @args) = @{$dq->{args}};
246 die "Function name must be identifier"
247 unless is_Identifier $func;
249 # The problem we have here is that built-ins can't be quoted, generally.
250 # I rather wonder if things like MAX(...) need to -not- be handled as
251 # an apply and instead of something else, maybe a parenop type - but
252 # as an explicitly Naive renderer this seems like a reasonable answer.
253 local @{$self}{qw(reserved_ident_parts always_quote)};
254 $self->_render_identifier($func)->[0];
258 intersperse(',', map $self->_maybe_parenthesise($_), @args),
264 my ($self, $dq) = @_;
265 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
267 $_ eq '==' and return '=';
268 $_ eq 'eq' and return '=';
269 $_ eq '!' and return 'NOT';
271 return uc $perl_op; # hope!
273 die "Can't convert non-perl op yet";
277 my ($self, $dq) = @_;
278 die "Empty select list" unless @{$dq->{select}};
280 # it is, in fact, completely valid for there to be nothing for us
281 # to project from since many databases handle 'SELECT 1;' fine
283 my @select = intersperse(',',
285 ? $self->_render_alias($_, $self->_format_keyword('AS'))
286 : $self->_render($_)), @{$dq->{select}}
290 $self->_format_keyword('SELECT'),
292 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
293 # since we're the SELECT and therefore always come first, we don't care.
295 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
302 my ($self, $dq, $as) = @_;
303 # FROM foo foo -> FROM foo
304 # FROM foo.bar bar -> FROM foo.bar
305 if ($self->collapse_aliases) {
306 if (is_Identifier(my $from = $dq->{from})) {
307 if ($from->{elements}[-1] eq $dq->{to}) {
308 return $self->_render($from);
313 $self->_maybe_parenthesise($dq->{from}),
315 $self->_render_identifier({ elements => [ $dq->{to} ] })
319 sub _render_literal {
320 my ($self, $dq) = @_;
321 unless ($dq->{subtype} eq 'SQL') {
322 die "Can't render non-SQL literal";
324 if (defined($dq->{literal})) {
326 $dq->{literal}, @{$dq->{values}||[]}
328 } elsif ($dq->{parts}) {
329 return [ map $self->_render($_), @{$dq->{parts}} ];
331 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
336 my ($self, $dq) = @_;
337 my ($left, $right) = @{$dq}{qw(left right)};
340 $self->_format_keyword(uc($dq->{outer}).' JOIN');
341 } elsif ($dq->{on}) {
342 $self->_format_keyword('JOIN');
347 my $rhs = $self->_render($right);
349 $self->_render($left), $join,
350 (is_Join($right) ? ('(', $rhs, ')') : $rhs),
352 ? ($self->_format_keyword('ON'), $self->_render($dq->{on}))
358 my ($self, $dq) = @_;
359 my ($from, $where) = @{$dq}{qw(from where)};
360 my $keyword = (is_Group($from) ? 'HAVING' : 'WHERE');
362 ($from ? $self->_render($from) : ()),
363 $self->_format_keyword($keyword),
364 $self->_render($where)
369 my ($self, $dq) = @_;
371 $self->_format_keyword('ORDER BY'),
372 $self->_render($dq->{by}),
374 ? $self->_format_keyword('DESC')
378 while ($from = $dq->{from}) {
379 last unless is_Order $from;
383 $self->_render($dq->{by}),
385 ? $self->_format_keyword('DESC')
389 unshift @ret, $self->_render($from) if $from;
394 my ($self, $dq) = @_;
395 # this could also squash like order does. but I dunno whether that should
396 # move somewhere else just yet.
398 ($dq->{from} ? $self->_render($dq->{from}) : ()),
401 $self->_format_keyword('GROUP BY'),
402 intersperse(',', map $self->_render($_), @{$dq->{by}})
410 my ($self, $dq) = @_;
411 my ($target, $where) = @{$dq}{qw(target where)};
412 [ $self->_format_keyword('DELETE FROM'),
413 $self->_render($target),
415 ? ($self->_format_keyword('WHERE'), $self->_render($where))
421 my ($self, $dq) = @_;
422 my ($target, $set, $where) = @{$dq}{qw(target set where)};
424 die "Must have set key - names+value keys not yet tested";
425 my ($names, $value) = @{$dq}{qw(names value)};
426 die "Must have names and value or set" unless $names and $value;
427 die "names and value must be same size" unless @$names == @$value;
428 $set = [ map [ $names->[$_], $value->[$_] ], 0..$#$names ];
430 my @rendered_set = intersperse(
431 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
433 [ $self->_format_keyword('UPDATE'),
434 $self->_render($target),
435 $self->_format_keyword('SET'),
438 ? ($self->_format_keyword('WHERE'), $self->_render($where))
444 my ($self, $dq) = @_;
445 my ($target, $names, $values, $returning)
446 = @{$dq}{qw(target names values returning)};
448 die "Must have values key - sets key not yet implemented";
450 [ $self->_format_keyword('INSERT INTO'),
451 $self->_render($target),
453 ? ('(', intersperse(',', map $self->_render($_), @$names), ')')
455 $self->_format_keyword('VALUES'),
457 map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ],
461 ? ($self->_format_keyword('RETURNING'),
462 intersperse(',', map $self->_render($_), @$returning))