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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; |
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, |
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46 | isa => HashRef[CodeRef], |
47 | metaclass => 'Collection::ImmutableHash', |
48 | provides => { |
49 | get => 'lookup_where_dispatch' |
50 | } |
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51 | ); |
52 | |
53 | has binop_map => ( |
54 | is => 'ro', |
55 | lazy_build => 1, |
56 | isa => HashRef, |
57 | metaclass => 'Collection::ImmutableHash', |
58 | provides => { |
59 | exists => 'is_valid_binop', |
60 | get => 'binop_mapping', |
61 | keys => 'binary_operators' |
62 | } |
63 | ); |
64 | |
65 | sub _build_binop_map { return {%BINOP_MAP} }; |
66 | |
67 | method _build_where_dispatch_table { |
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68 | my $binop = $self->can('_binop') or croak "InternalError: $self can't do _binop!"; |
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69 | return { |
70 | map { $_ => $binop } $self->binary_operators |
71 | } |
72 | } |
73 | |
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74 | has ast_version => ( |
75 | is => 'ro', |
76 | isa => Int, |
77 | required => 1 |
78 | ); |
79 | |
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80 | has name_separator => ( |
81 | is => 'rw', |
82 | isa => NameSeparator, |
83 | default => sub { ['.'] }, |
84 | coerece => 1, |
85 | required => 1, |
86 | ); |
87 | |
88 | has list_separator => ( |
89 | is => 'rw', |
90 | isa => Str, |
91 | default => ', ', |
92 | required => 1, |
93 | ); |
94 | |
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95 | has binds => ( |
96 | isa => ArrayRef, |
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97 | is => 'ro', |
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98 | clearer => '_clear_binds', |
99 | lazy => 1, |
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100 | default => sub { [ ] }, |
101 | metaclass => 'Collection::Array', |
102 | provides => { |
103 | push => 'add_bind', |
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104 | } |
105 | ); |
106 | |
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107 | # TODO: once MXMS supports %args, use that here |
108 | method create(ClassName $class: Int $ver) { |
109 | croak "AST version $ver is greater than supported version of $AST_VERSION" |
110 | if $ver > $AST_VERSION; |
111 | |
112 | my $name = "${class}::AST::v$ver"; |
113 | Class::MOP::load_class($name); |
114 | |
115 | return $name->new(ast_version => $ver); |
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116 | } |
117 | |
118 | # Main entry point |
119 | method generate(ClassName $class: ArrayRef $ast) { |
120 | croak "SQL::Abstract AST version not specified" |
121 | unless ($ast->[0] eq '-ast_version'); |
122 | |
123 | my (undef, $ver) = splice(@$ast, 0, 2); |
124 | |
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125 | # TODO: once MXMS supports %args, use that here |
126 | my $self = $class->create($ver); |
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127 | |
128 | return ($self->dispatch($ast), $self->binds); |
129 | } |
130 | |
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131 | method reset() { |
132 | $self->_clear_binds(); |
133 | } |
134 | |
135 | method dispatch (ArrayRef $ast) { |
136 | |
137 | local $_ = $ast->[0]; |
138 | s/^-/_/ or croak "Unknown type tag '$_'"; |
139 | |
140 | my $meth = $self->can($_) || croak "Unknown tag '$_'"; |
141 | return $meth->($self, $ast); |
142 | } |
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143 | |
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144 | }; |