Commit | Line | Data |
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1 | use MooseX::Declare; |
2 | |
3 | class SQL::Abstract::AST::v1 extends SQL::Abstract { |
4 | |
5 | use Carp qw/croak/; |
6 | use Data::Dump qw/pp/; |
7 | |
8 | use Moose::Util::TypeConstraints; |
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9 | use MooseX::Types::Moose qw/ArrayRef Str Int Ref HashRef/; |
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10 | use MooseX::AttributeHelpers; |
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11 | use SQL::Abstract::Types qw/AST/; |
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12 | use Devel::PartialDump qw/dump/; |
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13 | |
14 | clean; |
15 | |
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16 | # set things that are valid in where clauses |
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17 | override _build_expr_dispatch_table { |
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18 | return { |
19 | %{super()}, |
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20 | in => $self->can('_in'), |
21 | not_in => $self->can('_in'), |
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22 | between => $self->can('_between'), |
23 | not_between => $self->can('_between'), |
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24 | and => $self->can('_recurse_where'), |
25 | or => $self->can('_recurse_where'), |
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26 | map { +"$_" => $self->can("_$_") } qw/ |
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27 | value |
28 | name |
29 | true |
30 | false |
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31 | expr |
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32 | / |
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33 | }; |
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34 | } |
35 | |
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36 | method _select(AST $ast) { |
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37 | # Default to requiring columns and from. |
38 | # DB specific ones (i.e. mysql/Pg) can not require the FROM part with a bit |
39 | # of refactoring |
40 | |
41 | for (qw/columns tablespec/) { |
42 | confess "'$_' is required in select AST with " . dump ($ast) |
43 | unless exists $ast->{$_}; |
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44 | } |
45 | |
46 | # Check that columns is a -list |
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47 | confess "'columns' should be an array ref, not " . dump($ast->{columns}) |
48 | unless is_ArrayRef($ast->{columns}); |
49 | |
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50 | my $cols = $self->_list({-type => 'list', args => $ast->{columns} }); |
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51 | |
52 | my @output = ( |
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53 | SELECT => $cols |
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54 | ); |
55 | |
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56 | push @output, FROM => $self->dispatch($ast->{tablespec}) |
57 | if exists $ast->{tablespec}; |
58 | |
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59 | if (exists $ast->{where}) { |
60 | my $sub_ast = $ast->{where}; |
61 | |
62 | confess "$_ option is not an AST: " . dump($sub_ast) |
63 | unless is_AST($sub_ast); |
64 | |
65 | push @output, "WHERE", $self->_expr($sub_ast); |
66 | } |
67 | |
68 | for (qw/group_by having order_by/) { |
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69 | if (exists $ast->{$_}) { |
70 | my $sub_ast = $ast->{$_}; |
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71 | |
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72 | confess "$_ option is not an AST or an ArrayRef: " . dump($sub_ast) |
73 | unless is_AST($sub_ast) || is_ArrayRef($sub_ast);; |
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74 | |
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75 | my $meth = "__$_"; |
76 | push @output, $self->$meth($sub_ast); |
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77 | } |
78 | } |
79 | |
80 | return join(' ', @output); |
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81 | } |
82 | |
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83 | method _join(HashRef $ast) { |
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84 | |
85 | # TODO: Validate join type |
86 | my $type = $ast->{join_type} || ""; |
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87 | |
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88 | my @output = $self->dispatch($ast->{lhs}); |
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89 | |
90 | push @output, uc $type if $type; |
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91 | push @output, "JOIN", $self->dispatch($ast->{rhs}); |
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92 | |
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93 | push @output, |
94 | exists $ast->{on} |
95 | ? ('ON', '(' . $self->_expr( $ast->{on} ) . ')' ) |
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96 | : ('USING', '(' .$self->dispatch($ast->{using} |
97 | || croak "No 'on' or 'uinsg' clause passed to join cluase: " . |
98 | dump($ast) |
99 | ) . |
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100 | ')' ); |
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101 | |
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102 | return join(" ", @output); |
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103 | |
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104 | } |
105 | |
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106 | method _ordering(AST $ast) { |
107 | |
108 | my $output = $self->_expr($ast->{expr}); |
109 | |
110 | $output .= " " . uc $1 |
111 | if $ast->{direction} && |
112 | ( $ast->{direction} =~ /^(asc|desc)$/i |
113 | || confess "Unknown ordering direction " . dump($ast) |
114 | ); |
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115 | |
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116 | return $output; |
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117 | } |
118 | |
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119 | method _name(AST $ast) { |
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120 | my @names = @{$ast->{args}}; |
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121 | |
122 | my $sep = $self->name_separator; |
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123 | my $quote = $self->is_quoting |
124 | ? $self->quote_chars |
125 | : [ '' ]; |
126 | |
127 | my $join = $quote->[-1] . $sep . $quote->[0]; |
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128 | |
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129 | # We dont want to quote * in [qw/me */]: `me`.* is the desired output there |
130 | # This means you can't have a field called `*`. I am willing to accept this |
131 | # situation, cos thats a really stupid thing to want. |
132 | my $post; |
133 | $post = pop @names if $names[-1] eq '*'; |
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134 | |
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135 | my $ret; |
136 | $ret = $quote->[0] . |
137 | join( $join, @names ) . |
138 | $quote->[-1] |
139 | if @names; |
140 | |
141 | $ret = $ret |
142 | ? $ret . $sep . $post |
143 | : $post |
144 | if defined $post; |
145 | |
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146 | |
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147 | return $ret; |
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148 | } |
149 | |
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150 | |
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151 | method _list(AST $ast) { |
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152 | return "" unless $ast->{args}; |
153 | |
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154 | my @items = is_ArrayRef($ast->{args}) |
155 | ? @{$ast->{args}} |
156 | : $ast->{args}; |
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157 | |
158 | return join( |
159 | $self->list_separator, |
160 | map { $self->dispatch($_) } @items); |
161 | } |
162 | |
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163 | # TODO: I think i want to parameterized AST type to get better validation |
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164 | method _alias(AST $ast) { |
165 | |
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166 | # TODO: Maybe we want qq{ AS "$as"} here |
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167 | return $self->dispatch($ast->{ident}) . " AS " . $ast->{as}; |
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168 | |
169 | } |
170 | |
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171 | method _value(AST $ast) { |
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172 | |
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173 | $self->add_bind($ast->{value}); |
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174 | return "?"; |
175 | } |
176 | |
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177 | # Not dispatchable to. |
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178 | method __having($args) { |
179 | return "HAVING " . $self->_list({-type => 'list', args => $args}); |
180 | } |
181 | |
182 | method __group_by($args) { |
183 | return "GROUP BY " . $self->_list({-type => 'list', args => $args}); |
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184 | } |
185 | |
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186 | method __order_by($args) { |
187 | return "ORDER BY " . $self->_list({-type => 'list', args => $args}); |
188 | } |
189 | |
190 | |
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191 | # Perhaps badly named. handles 'and' and 'or' clauses |
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192 | method _recurse_where(AST $ast) { |
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193 | |
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194 | my $op = $ast->{op}; |
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195 | |
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196 | my $OP = uc $op; |
197 | my $prio = $SQL::Abstract::PRIO{$op}; |
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198 | |
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199 | my $dispatch_table = $self->expr_dispatch_table; |
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200 | |
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201 | my @output; |
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202 | foreach ( @{$ast->{args}} ) { |
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203 | croak "invalid component in where clause: $_" unless is_AST($_); |
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204 | |
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205 | if ($_->{-type} eq 'expr' && $_->{op} =~ /^(and|or)$/) { |
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206 | my $sub_prio = $SQL::Abstract::PRIO{$1}; |
207 | |
208 | if ($sub_prio <= $prio) { |
209 | push @output, $self->_recurse_where($_); |
210 | } else { |
211 | push @output, '(' . $self->_recurse_where($_) . ')'; |
212 | } |
213 | } else { |
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214 | push @output, $self->_expr($_); |
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215 | } |
216 | } |
217 | |
218 | return join(" $OP ", @output); |
219 | } |
220 | |
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221 | method _expr(AST $ast) { |
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222 | my $op = $ast->{-type}; |
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223 | |
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224 | $op = $ast->{op} if $op eq 'expr'; |
225 | |
226 | if (my $code = $self->lookup_expr_dispatch($op)) { |
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227 | |
228 | return $code->($self, $ast); |
229 | |
230 | } |
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231 | croak "'$op' is not a valid AST type in an expression with " . dump($ast) |
232 | if $ast->{-type} ne 'expr'; |
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233 | |
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234 | # This is an attempt to do some form of validation on function names. This |
235 | # might end up being a bad thing. |
236 | croak "'$op' is not a valid operator in an expression with " . dump($ast) |
237 | if $op =~ /\W/; |
238 | |
239 | return $self->_generic_function_op($ast); |
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240 | |
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241 | } |
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242 | |
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243 | method _binop(AST $ast) { |
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244 | my ($lhs, $rhs) = @{$ast->{args}}; |
245 | my $op = $ast->{op}; |
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246 | |
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247 | join (' ', $self->_expr($lhs), |
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248 | $self->binop_mapping($op) || croak("Unknown binary operator $op"), |
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249 | $self->_expr($rhs) |
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250 | ); |
251 | } |
252 | |
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253 | method _generic_function_op(AST $ast) { |
254 | my $op = $ast->{op}; |
255 | |
256 | return "$op(" . $self->_list($ast) . ")"; |
257 | } |
258 | |
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259 | method _in(AST $ast) { |
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260 | |
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261 | my ($field,@values) = @{$ast->{args}}; |
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262 | |
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263 | my $not = ($ast->{op} =~ /^not_/) ? " NOT" : ""; |
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264 | |
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265 | return $self->_false unless @values; |
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266 | |
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267 | return $self->_expr($field) . |
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268 | $not . |
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269 | " IN (" . |
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270 | join(", ", map { $self->dispatch($_) } @values ) . |
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271 | ")"; |
272 | } |
273 | |
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274 | method _between(AST $ast) { |
275 | |
276 | my ($field,@values) = @{$ast->{args}}; |
277 | |
278 | my $not = ($ast->{op} =~ /^not_/) ? " NOT" : ""; |
279 | croak "between requires 3 arguments: " . dump($ast) |
280 | unless @values == 2; |
281 | |
282 | return $self->_expr($field) . |
283 | $not . |
284 | " BETWEEN " . |
285 | join(" AND ", map { $self->dispatch($_) } @values ); |
286 | } |
287 | |
44cfd1f6 |
288 | # 'constants' that are portable across DBs |
289 | method _false($ast?) { "0 = 1" } |
290 | method _true($ast?) { "1 = 1" } |
291 | |
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292 | } |