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