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