1 package Data::Query::Renderer::SQL::Naive;
4 use SQL::ReservedWords;
5 use Data::Query::Constants qw(
6 DQ_IDENTIFIER DQ_OPERATOR DQ_VALUE DQ_JOIN DQ_ALIAS DQ_ORDER DQ_LITERAL
10 bless({ %{$_[1]||{}} }, (ref($_[0])||$_[0]))->BUILDALL;
15 $self->{reserved_ident_parts}
17 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
19 $self->{quote_chars}||=[''];
20 $self->{simple_ops}||=$self->_default_simple_ops;
24 sub _default_simple_ops {
26 (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ),
27 (map +($_ => 'unop'), qw(NOT) ),
28 (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')),
29 (map +($_ => 'flatten'), qw(AND OR) ),
30 (map +($_ => 'in'), ('IN', 'NOT IN')),
31 (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')),
38 $self->_flatten_structure($self->_render(@_))
41 sub _flatten_structure {
42 my ($self, $struct) = @_;
48 elsif ($r eq 'ARRAY') {
49 my ($sql, @b) = @{$self->_flatten_structure($_)};
53 elsif ($r eq 'HASH') { push @bind, $_; () }
54 else { die "_flatten_structure can't handle ref type $r for $_" }
57 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
64 # I present this to permit strange people to easily supply a patch to lc()
65 # their keywords, as I have heard many desire to do, lest they infect me
66 # with whatever malady caused this desire by their continued proximity for
67 # want of such a feature.
69 sub _format_keyword { $_[1] }
72 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
77 require Data::Dumper::Concise;
78 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
81 sub _render_identifier {
82 die "Unidentified identifier (SQL can no has \$_)"
83 unless my @i = @{$_[1]->{elements}};
84 # handle single or paired quote chars
85 my ($q1, $q2) = @{$_[0]->{quote_chars}}[0,-1];
86 my $always_quote = $_[0]->{always_quote};
87 my $res_check = $_[0]->{reserved_ident_parts};
90 $_[0]->{identifier_sep}||'.',
92 $_ eq '*' # Yes, this means you can't have a column just called '*'.
93 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
94 : ( # reserved are stored uc, quote if non-word
95 $always_quote || $res_check->{+uc} || /\W/
104 defined($_[1]->{value})
109 sub _operator_type { 'SQL.Naive' }
111 sub _render_operator {
112 my ($self, $dq) = @_;
113 my $op = $dq->{operator};
114 unless (exists $op->{$self->_operator_type}) {
115 $op->{$self->_operator_type} = $self->_convert_op($dq);
117 my $op_name = $op->{$self->_operator_type};
118 if (my $op_type = $self->{simple_ops}{$op_name}) {
119 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
120 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
121 return $self->$meth($dq);
123 if (my $argc = @{$dq->{args}}) {
125 return $self->_handle_op_type_unop($op_name, $dq);
126 } elsif ($argc == 2) {
127 return $self->_handle_op_type_binop($op_name, $dq);
130 die "Unsure how to handle ${op_name}";
133 sub _handle_op_type_binop {
134 my ($self, $op_name, $dq) = @_;
135 die "${op_name} registered as binary op but args contain "
136 .scalar(@{$dq->{args}})." entries"
137 unless @{$dq->{args}} == 2;
139 $self->_render($dq->{args}[0]),
141 $self->_render($dq->{args}[1]),
145 sub _handle_op_type_unop {
146 my ($self, $op_name, $dq) = @_;
147 die "${op_name} registered as unary op but args contain "
148 .scalar(@{$dq->{args}})." entries"
149 unless @{$dq->{args}} == 1;
153 $self->_render($dq->{args}[0]),
158 sub _handle_op_type_unop_reverse {
159 my ($self, $op_name, $dq) = @_;
160 die "${op_name} registered as unary op but args contain "
161 .scalar(@{$dq->{args}})." entries"
162 unless @{$dq->{args}} == 1;
164 $self->_render($dq->{args}[0]),
169 sub _handle_op_type_flatten {
170 my ($self, $op_name, $dq) = @_;
171 my @argq = @{$dq->{args}};
173 while (my $arg = shift @argq) {
175 unless ($arg->{type} eq DQ_OPERATOR) {
176 push @arg_final, $arg;
180 my $op = $arg->{operator};
181 unless (exists $op->{$self->_operator_type}) {
182 $op->{$self->_operator_type} = $self->_convert_op($arg);
185 if ($op->{$self->_operator_type} eq $op_name) {
186 unshift @argq, @{$arg->{args}};
188 push @arg_final, $arg;
191 my @sql = ('(', map +($self->_render($_), $op_name), @arg_final);
192 $sql[-1] = ')'; # replace final AND or whatever with )
196 sub _handle_op_type_in {
197 my ($self, $op, $dq) = @_;
198 my ($lhs, @in) = @{$dq->{args}};
199 my @rhs = ('(', map +($self->_render($_), ','), @in);
201 [ $self->_render($lhs), $op, @rhs ];
204 sub _handle_op_type_between {
205 my ($self, $op_name, $dq) = @_;
206 my @args = @{$dq->{args}};
208 my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @args);
209 [ $lhs, $op_name, $rhs1, 'AND', $rhs2 ];
210 } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) {
211 my ($lhs, $rhs) = (map $self->_render($_), @args);
212 [ $lhs, $op_name, $rhs ];
214 die "Invalid args for between: ${\scalar @args} given";
218 sub _handle_op_type_apply {
219 my ($self, $op_name, $dq) = @_;
220 my ($func, @args) = @{$dq->{args}};
221 die "Function name must be identifier"
222 unless $func->{type} eq DQ_IDENTIFIER;
224 # The problem we have here is that built-ins can't be quoted, generally.
225 # I rather wonder if things like MAX(...) need to -not- be handled as
226 # an apply and instead of something else, maybe a parenop type - but
227 # as an explicitly Naive renderer this seems like a reasonable answer.
228 local @{$self}{qw(reserved_ident_parts always_quote)};
229 $self->_render_identifier($func)->[0];
233 (map $self->_render($_), @args),
239 my ($self, $dq) = @_;
240 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
242 $_ eq '==' and return '=';
243 $_ eq 'eq' and return '=';
244 $_ eq '!' and return 'NOT';
246 return uc $perl_op; # hope!
248 die "Can't convert non-perl op yet";
252 my ($self, $dq) = @_;
253 die "Empty select list" unless @{$dq->{select}};
255 # it is, in fact, completely valid for there to be nothing for us
256 # to project from since many databases handle 'SELECT 1;' fine
259 ($_->{type} eq DQ_ALIAS
260 ? $self->_render_alias($_, $self->_format_keyword('AS'))
266 # we put the commas inside the [] for each entry as a hint to the pretty
267 # printer downstream so now we need to eliminate the comma from the last
268 # entry - we know there always is one due to the die guard at the top
273 $self->_format_keyword('SELECT'),
275 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
276 # since we're the SELECT and therefore always come first, we don't care.
278 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
285 my ($self, $dq, $as) = @_;
286 # FROM foo foo -> FROM foo
287 # FROM foo.bar bar -> FROM foo.bar
288 if ($dq->{alias}{type} eq DQ_IDENTIFIER) {
289 if ($dq->{alias}{elements}[-1] eq $dq->{as}) {
290 return $self->_render($dq->{alias});
294 $self->_render($dq->{alias}),
296 $self->_render_identifier({ elements => [ $dq->{as} ] })
300 sub _render_literal {
301 my ($self, $dq) = @_;
302 unless ($dq->{subtype} eq 'SQL') {
303 die "Can't render non-SQL literal";
305 if ($dq->{literal}) {
307 $dq->{literal}, @{$dq->{values}||[]}
309 } elsif ($dq->{parts}) {
310 return [ map $self->_render($_), @{$dq->{parts}} ];
312 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
317 my ($self, $dq) = @_;
318 my ($left, $right) = @{$dq->{join}};
319 die "No support for ON yet" if $dq->{on};
320 die "No support for LEFT/RIGHT yet" if $dq->{outer};
321 [ $self->_render($left), ',', $self->_render($right) ];
325 my ($self, $dq) = @_;
326 my ($from, $where) = @{$dq}{qw(from where)};
328 ($from ? $self->_render($from) : ()),
329 $self->_format_keyword('WHERE'),
330 $self->_render($where)
335 my ($self, $dq) = @_;
337 $self->_format_keyword('ORDER BY'),
338 $self->_render($dq->{by}),
339 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
342 while ($from = $dq->{from}) {
343 last unless $from->{type} eq DQ_ORDER;
347 $self->_render($dq->{by}),
348 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
351 unshift @ret, $self->_render($from) if $from;