1 package Data::Query::Renderer::SQL::Naive;
4 use SQL::ReservedWords;
5 use Data::Query::Constants qw(DQ_IDENTIFIER DQ_OPERATOR DQ_VALUE);
8 bless({ %{$_[1]||{}} }, (ref($_[0])||$_[0]))->BUILDALL;
13 $self->{reserved_ident_parts}
15 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
17 $self->{quote_chars}||=[''];
18 $self->{simple_ops}||=$self->_default_simple_ops;
22 sub _default_simple_ops {
24 (map +($_ => 'binop'), qw(= > < >= <=) ),
25 (map +($_ => 'unop'), (qw(NOT)) ),
26 (map +($_ => 'flatten'), qw(AND OR) ),
32 $self->_flatten_structure($self->_render(@_))
35 sub _flatten_structure {
36 my ($self, $struct) = @_;
41 elsif ($r eq 'ARRAY') {
42 my ($sql, @b) = @{$self->_flatten_structure($_)};
46 elsif ($r eq 'HASH') { push @bind, $_; () }
47 else { die "_flatten_structure can't handle ref type $r for $_" }
52 $_[0]->${\"_render_${\lc($_[1]->{type})}"}($_[1]);
55 sub _render_identifier {
56 die "Unidentified identifier (SQL can no has \$_)"
57 unless my @i = @{$_[1]->{elements}};
58 # handle single or paired quote chars
59 my ($q1, $q2) = @{$_[0]->{quote_chars}}[0,-1];
60 my $always_quote = $_[0]->{always_quote};
61 my $res_check = $_[0]->{reserved_ident_parts};
64 $_[0]->{identifier_sep}||'.',
66 $_ eq '*' # Yes, this means you can't have a column just called '*'.
67 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
68 : ( # reserved are stored uc, quote if non-word
69 $always_quote || $res_check->{+uc} || /\W/
81 sub _operator_type { 'SQL.Naive' }
83 sub _render_operator {
85 my $op = $dq->{operator};
86 unless (exists $op->{$self->_operator_type}) {
87 $op->{$self->_operator_type} = $self->_convert_op($dq);
89 if (my $op_type = $self->{simple_ops}{my $op_name = $op->{$self->_operator_type}}) {
90 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
92 die "Couldn't render operator ".$op->{$self->_operator_type};
95 sub _handle_op_type_binop {
96 my ($self, $op_name, $dq) = @_;
97 die "${op_name} registered as binary op but args contain "
98 .scalar(@{$dq->{args}})." entries"
99 unless @{$dq->{args}} == 2;
101 $self->_render($dq->{args}[0]),
103 $self->_render($dq->{args}[1]),
107 sub _handle_op_type_unop {
108 my ($self, $op_name, $dq) = @_;
109 die "${op_name} registered as unary op but args contain "
110 .scalar(@{$dq->{args}})." entries"
111 unless @{$dq->{args}} == 1;
114 $self->_render($dq->{args}[0]),
118 sub _handle_op_type_flatten {
119 my ($self, $op_name, $dq) = @_;
120 my @argq = @{$dq->{args}};
122 while (my $arg = shift @argq) {
124 unless ($arg->{type} eq DQ_OPERATOR) {
125 push @arg_final, $arg;
129 my $op = $arg->{operator};
130 unless (exists $op->{$self->_operator_type}) {
131 $op->{$self->_operator_type} = $self->_convert_op($arg);
134 if ($op->{$self->_operator_type} eq $op_name) {
135 unshift @argq, @{$arg->{args}};
137 push @arg_final, $arg;
140 my @sql = ('(', map +($self->_render($_), $op_name), @arg_final);
141 $sql[-1] = ')'; # replace final AND or whatever with )
146 my ($self, $dq) = @_;
147 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
149 $_ eq '==' and return '=';
150 $_ eq 'eq' and return '=';
151 $_ eq '!' and return 'NOT';
153 return uc $perl_op; # hope!
155 die "Can't convert non-perl op yet";