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1 | package Data::Query::ExprHelpers; |
2 | |
3 | use strictures 1; |
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4 | use Data::Query::Constants; |
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5 | |
6 | use base qw(Exporter); |
7 | |
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8 | our @EXPORT = qw(perl_scalar_value perl_operator Literal Identifier compose); |
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9 | |
10 | sub perl_scalar_value { |
11 | +{ |
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12 | type => DQ_VALUE, |
13 | subtype => { Perl => 'Scalar' }, |
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14 | value => $_[0], |
15 | $_[1] ? (value_meta => $_[1]) : () |
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16 | } |
17 | } |
18 | |
19 | sub perl_operator { |
20 | my ($op, @args) = @_; |
21 | +{ |
22 | type => DQ_OPERATOR, |
23 | operator => { Perl => $op }, |
24 | args => \@args |
25 | } |
26 | } |
27 | |
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28 | my %map = ( |
29 | Join => [ qw(left right on outer) ], |
30 | Alias => [ qw(to from) ], |
31 | Operator => [ qw(operator args) ], |
32 | Select => [ qw(select from) ], |
33 | Where => [ qw(where from) ], |
34 | Order => [ qw(by reverse from) ], |
35 | Group => [ qw(by from) ], |
36 | Delete => [ qw(where target) ], |
37 | Update => [ qw(set where target) ], |
38 | Insert => [ qw(names values target returning) ], |
39 | Slice => [ qw(offset limit from) ], |
40 | ); |
41 | |
42 | sub Literal { |
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43 | my $subtype = shift; |
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44 | if (ref($_[0])) { |
45 | return +{ |
46 | type => DQ_LITERAL, |
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47 | subtype => $subtype, |
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48 | parts => $_[0], |
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49 | }; |
50 | } |
51 | return +{ |
52 | type => DQ_LITERAL, |
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53 | subtype => $subtype, |
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54 | literal => $_[0], |
55 | ($_[1] ? (values => $_[1]) : ()) |
56 | }; |
57 | } |
58 | |
59 | sub Identifier { |
60 | return +{ |
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61 | type => DQ_IDENTIFIER, |
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62 | elements => [ @_ ], |
63 | }; |
64 | } |
65 | |
66 | foreach my $name (values %Data::Query::Constants::CONST) { |
67 | no strict 'refs'; |
68 | my $sub = "is_${name}"; |
69 | *$sub = sub { |
70 | my $dq = $_[0]||$_; |
71 | $dq->{type} eq $name |
72 | }; |
73 | push @EXPORT, $sub; |
74 | if ($map{$name}) { |
75 | my @map = @{$map{$name}}; |
76 | *$name = sub { |
77 | my $dq = { type => $name }; |
78 | foreach (0..$#_) { |
79 | $dq->{$map[$_]} = $_[$_] if defined $_[$_]; |
80 | } |
81 | return $dq; |
82 | }; |
83 | push @EXPORT, $name; |
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84 | } |
85 | } |
86 | |
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87 | sub compose (&@) { |
88 | my $code = shift; |
89 | require Scalar::Util; |
90 | my $type = Scalar::Util::reftype($code); |
91 | unless($type and $type eq 'CODE') { |
92 | require Carp; |
93 | Carp::croak("Not a subroutine reference"); |
94 | } |
95 | no strict 'refs'; |
96 | |
97 | return shift unless @_ > 1; |
98 | |
99 | use vars qw($a $b); |
100 | |
101 | my $caller = caller; |
102 | local(*{$caller."::a"}) = \my $a; |
103 | local(*{$caller."::b"}) = \my $b; |
104 | |
105 | $a = pop; |
106 | foreach (reverse @_) { |
107 | $b = $_; |
108 | $a = &{$code}(); |
109 | } |
110 | |
111 | $a; |
112 | } |
113 | |
114 | |
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115 | 1; |