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1 | use MooseX::Declare; |
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2 | |
3 | |
4 | class SQL::Abstract { |
5 | |
6 | use Carp qw/croak/; |
7 | use Data::Dump qw/pp/; |
8 | |
9 | use Moose::Util::TypeConstraints; |
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10 | use MooseX::Types -declare => [qw/NameSeparator/]; |
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11 | use MooseX::Types::Moose qw/ArrayRef Str Int HashRef CodeRef/; |
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12 | use MooseX::AttributeHelpers; |
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13 | use SQL::Abstract::Types qw/NameSeparator AST ArrayAST/; |
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14 | |
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15 | clean; |
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16 | |
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17 | our $VERSION = '2.000000'; |
18 | |
19 | our $AST_VERSION = '1'; |
20 | |
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21 | # Operator precedence for bracketing |
22 | our %PRIO = ( |
23 | and => 10, |
24 | or => 50 |
25 | ); |
26 | |
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27 | our %BINOP_MAP = ( |
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28 | '>' => '>', |
29 | '<' => '<', |
30 | '==' => '=', |
31 | '!=' => '!=', |
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32 | # LIKE is always "field LIKE <value>" |
33 | '-like' => 'IN', |
34 | '-not_like' => 'NOT LIKE', |
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35 | ); |
36 | |
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37 | has where_dispatch_table => ( |
38 | is => 'ro', |
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39 | lazy => 1, |
40 | builder => '_build_where_dispatch_table', |
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41 | isa => HashRef[CodeRef], |
42 | metaclass => 'Collection::ImmutableHash', |
43 | provides => { |
44 | get => 'lookup_where_dispatch' |
45 | } |
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46 | ); |
47 | |
48 | has binop_map => ( |
49 | is => 'ro', |
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50 | lazy => 1, |
51 | builder => '_build_binops', |
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52 | isa => HashRef, |
53 | metaclass => 'Collection::ImmutableHash', |
54 | provides => { |
55 | exists => 'is_valid_binop', |
56 | get => 'binop_mapping', |
57 | keys => 'binary_operators' |
58 | } |
59 | ); |
60 | |
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61 | # List of default binary operators (for in where clauses) |
62 | sub _build_binops { return {%BINOP_MAP} }; |
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63 | |
64 | method _build_where_dispatch_table { |
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65 | my $binop = $self->can('_binop') or croak "InternalError: $self can't do _binop!"; |
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66 | return { |
67 | map { $_ => $binop } $self->binary_operators |
68 | } |
69 | } |
70 | |
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71 | has ast_version => ( |
72 | is => 'ro', |
73 | isa => Int, |
74 | required => 1 |
75 | ); |
76 | |
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77 | has name_separator => ( |
78 | is => 'rw', |
79 | isa => NameSeparator, |
80 | default => sub { ['.'] }, |
81 | coerece => 1, |
82 | required => 1, |
83 | ); |
84 | |
85 | has list_separator => ( |
86 | is => 'rw', |
87 | isa => Str, |
88 | default => ', ', |
89 | required => 1, |
90 | ); |
91 | |
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92 | has binds => ( |
93 | isa => ArrayRef, |
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94 | is => 'ro', |
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95 | clearer => '_clear_binds', |
96 | lazy => 1, |
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97 | default => sub { [ ] }, |
98 | metaclass => 'Collection::Array', |
99 | provides => { |
100 | push => 'add_bind', |
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101 | } |
102 | ); |
103 | |
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104 | # TODO: once MXMS supports %args, use that here |
105 | method create(ClassName $class: Int $ver) { |
106 | croak "AST version $ver is greater than supported version of $AST_VERSION" |
107 | if $ver > $AST_VERSION; |
108 | |
109 | my $name = "${class}::AST::v$ver"; |
110 | Class::MOP::load_class($name); |
111 | |
112 | return $name->new(ast_version => $ver); |
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113 | } |
114 | |
115 | # Main entry point |
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116 | method generate(ClassName $class: AST $ast) { |
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117 | croak "SQL::Abstract AST version not specified" |
118 | unless ($ast->[0] eq '-ast_version'); |
119 | |
120 | my (undef, $ver) = splice(@$ast, 0, 2); |
121 | |
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122 | # TODO: once MXMS supports %args, use that here |
123 | my $self = $class->create($ver); |
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124 | |
125 | return ($self->dispatch($ast), $self->binds); |
126 | } |
127 | |
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128 | method reset() { |
129 | $self->_clear_binds(); |
130 | } |
131 | |
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132 | method dispatch (AST $ast) { |
133 | # I want multi methods! |
134 | my $tag; |
135 | if (is_ArrayAST($ast)) { |
136 | ($tag = $ast->[0]) =~ s/^-/_/; |
137 | } else { |
138 | $tag = "_" . $ast->{-type}; |
139 | } |
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140 | |
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141 | my $meth = $self->can($tag) || croak "Unknown tag '$tag'"; |
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142 | return $meth->($self, $ast); |
143 | } |
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144 | |
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145 | }; |