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1 | package Web::Dispatch; |
2 | |
3 | use Sub::Quote; |
4 | use Scalar::Util qw(blessed); |
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5 | |
6 | sub MAGIC_MIDDLEWARE_KEY { __PACKAGE__.'.middleware' } |
7 | |
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8 | use Moo; |
9 | use Web::Dispatch::Parser; |
10 | use Web::Dispatch::Node; |
11 | |
12 | with 'Web::Dispatch::ToApp'; |
13 | |
14 | has app => (is => 'ro', required => 1); |
15 | has parser_class => ( |
16 | is => 'ro', default => quote_sub q{ 'Web::Dispatch::Parser' } |
17 | ); |
18 | has node_class => ( |
19 | is => 'ro', default => quote_sub q{ 'Web::Dispatch::Node' } |
20 | ); |
21 | has node_args => (is => 'ro', default => quote_sub q{ {} }); |
22 | has _parser => (is => 'lazy'); |
23 | |
24 | sub _build__parser { |
25 | my ($self) = @_; |
26 | $self->parser_class->new; |
27 | } |
28 | |
29 | sub call { |
30 | my ($self, $env) = @_; |
1a0ea82a |
31 | my $res = $self->_dispatch($env, $self->app); |
32 | return $res->[0] if ref($res) eq 'ARRAY' and @{$res} == 1 and ref($res->[0]) eq 'CODE'; |
33 | return $res; |
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34 | } |
35 | |
36 | sub _dispatch { |
37 | my ($self, $env, @match) = @_; |
59ccc1e8 |
38 | while (defined(my $try = shift @match)) { |
75ad66d6 |
39 | |
40 | return $try if ref($try) eq 'ARRAY'; |
4ed4fb42 |
41 | if (ref($try) eq 'HASH') { |
d96756e8 |
42 | $env = { 'Web::Dispatch.original_env' => $env, %$env, %$try }; |
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43 | next; |
4ed4fb42 |
44 | } |
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45 | |
69aaa28a |
46 | my @result = $self->_to_try($try, \@match)->($env, @match); |
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47 | next unless @result and defined($result[0]); |
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48 | |
49 | my $first = $result[0]; |
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50 | |
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51 | if (my $res = $self->_have_result($first, \@result, \@match, $env)) { |
e4c7f3b4 |
52 | |
53 | return $res; |
54 | } |
75ad66d6 |
55 | |
56 | # make a copy so we don't screw with it assigning further up |
57 | my $env = $env; |
58 | unshift @match, sub { $self->_dispatch($env, @result) }; |
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59 | } |
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60 | |
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61 | return; |
62 | } |
63 | |
e4c7f3b4 |
64 | sub _have_result { |
6cf1d73a |
65 | my ($self, $first, $result, $match, $env) = @_; |
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66 | |
6cf1d73a |
67 | if (ref($first) eq 'ARRAY') { |
1a0ea82a |
68 | return $first; |
6bd99619 |
69 | } |
6cf1d73a |
70 | elsif (blessed($first) && $first->isa('Plack::Middleware')) { |
71 | return $self->_uplevel_middleware($first, $result); |
6bd99619 |
72 | } |
6cf1d73a |
73 | elsif (ref($first) eq 'HASH' and $first->{+MAGIC_MIDDLEWARE_KEY}) { |
74 | return $self->_redispatch_with_middleware($first, $match, $env); |
6bd99619 |
75 | } |
481da1e2 |
76 | elsif ( |
77 | blessed($first) && |
78 | not($first->can('to_app')) && |
79 | not($first->isa('Web::Dispatch::Matcher')) |
80 | ) { |
6bd99619 |
81 | return $first; |
82 | } |
6bd99619 |
83 | return; |
84 | } |
85 | |
e4c7f3b4 |
86 | sub _uplevel_middleware { |
6cf1d73a |
87 | my ($self, $match, $results) = @_; |
75ad66d6 |
88 | die "Multiple results but first one is a middleware ($match)" |
89 | if @{$results} > 1; |
90 | # middleware needs to uplevel exactly once to wrap the rest of the |
91 | # level it was created for - next elsif unwraps it |
92 | return { MAGIC_MIDDLEWARE_KEY, $match }; |
93 | } |
94 | |
e4c7f3b4 |
95 | sub _redispatch_with_middleware { |
6cf1d73a |
96 | my ($self, $first, $match, $env) = @_; |
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97 | |
98 | my $mw = $first->{+MAGIC_MIDDLEWARE_KEY}; |
99 | |
100 | $mw->app(sub { $self->_dispatch($_[0], @{$match}) }); |
101 | |
102 | return $mw->to_app->($env); |
103 | } |
104 | |
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105 | sub _to_try { |
69aaa28a |
106 | my ($self, $try, $more) = @_; |
c398ce1a |
107 | |
108 | # sub (<spec>) {} becomes a dispatcher |
109 | # sub {} is a PSGI app and can be returned as is |
110 | # '<spec>' => sub {} becomes a dispatcher |
456dc2bb |
111 | # $obj isa WD:Predicates::Matcher => sub { ... } - become a dispatcher |
c398ce1a |
112 | # $obj w/to_app method is a Plack::App-like thing - call it to get a PSGI app |
481da1e2 |
113 | # |
c398ce1a |
114 | |
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115 | if (ref($try) eq 'CODE') { |
116 | if (defined(my $proto = prototype($try))) { |
e251dfeb |
117 | $self->_construct_node(match => $proto, run => $try)->to_app; |
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118 | } else { |
119 | $try |
120 | } |
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121 | } elsif (!ref($try) and ref($more->[0]) eq 'CODE') { |
e251dfeb |
122 | $self->_construct_node(match => $try, run => shift(@$more))->to_app; |
481da1e2 |
123 | } elsif ( |
124 | (blessed($try) && $try->isa('Web::Dispatch::Matcher')) |
125 | and (ref($more->[0]) eq 'CODE') |
126 | ) { |
127 | $self->node_class->new({ |
128 | %{$self->node_args}, |
129 | match => $try, |
130 | run => shift(@$more) |
131 | })->to_app; |
4ed4fb42 |
132 | } elsif (blessed($try) && $try->can('to_app')) { |
133 | $try->to_app; |
134 | } else { |
135 | die "No idea how we got here with $try"; |
136 | } |
137 | } |
138 | |
139 | sub _construct_node { |
140 | my ($self, %args) = @_; |
e251dfeb |
141 | $args{match} = $self->_parser->parse($args{match}); |
69aaa28a |
142 | $self->node_class->new({ %{$self->node_args}, %args }); |
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143 | } |
144 | |
145 | 1; |