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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) = @_; |
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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) = @_; |
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38 | while (defined(my $try = shift @match)) { |
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39 | |
40 | return $try if ref($try) eq 'ARRAY'; |
4ed4fb42 |
41 | if (ref($try) eq 'HASH') { |
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42 | $env = { 'Web::Dispatch.original_env' => $env, %$env, %$try }; |
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43 | next; |
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44 | } |
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45 | |
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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)) { |
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52 | |
53 | return $res; |
54 | } |
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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 | |
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64 | sub _have_result { |
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65 | my ($self, $first, $result, $match, $env) = @_; |
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66 | |
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67 | if (ref($first) eq 'ARRAY') { |
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68 | return $first; |
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69 | } |
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70 | elsif (blessed($first) && $first->isa('Plack::Middleware')) { |
71 | return $self->_uplevel_middleware($first, $result); |
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72 | } |
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73 | elsif (ref($first) eq 'HASH' and $first->{+MAGIC_MIDDLEWARE_KEY}) { |
74 | return $self->_redispatch_with_middleware($first, $match, $env); |
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75 | } |
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76 | elsif (blessed($first) && !$first->can('to_app')) { |
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77 | return $first; |
78 | } |
79 | |
80 | return; |
81 | } |
82 | |
e4c7f3b4 |
83 | sub _uplevel_middleware { |
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84 | my ($self, $match, $results) = @_; |
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85 | die "Multiple results but first one is a middleware ($match)" |
86 | if @{$results} > 1; |
87 | # middleware needs to uplevel exactly once to wrap the rest of the |
88 | # level it was created for - next elsif unwraps it |
89 | return { MAGIC_MIDDLEWARE_KEY, $match }; |
90 | } |
91 | |
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92 | sub _redispatch_with_middleware { |
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93 | my ($self, $first, $match, $env) = @_; |
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94 | |
95 | my $mw = $first->{+MAGIC_MIDDLEWARE_KEY}; |
96 | |
97 | $mw->app(sub { $self->_dispatch($_[0], @{$match}) }); |
98 | |
99 | return $mw->to_app->($env); |
100 | } |
101 | |
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102 | sub _to_try { |
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103 | my ($self, $try, $more) = @_; |
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104 | |
105 | # sub (<spec>) {} becomes a dispatcher |
106 | # sub {} is a PSGI app and can be returned as is |
107 | # '<spec>' => sub {} becomes a dispatcher |
108 | # $obj w/to_app method is a Plack::App-like thing - call it to get a PSGI app |
109 | |
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110 | if (ref($try) eq 'CODE') { |
111 | if (defined(my $proto = prototype($try))) { |
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112 | $self->_construct_node(match => $proto, run => $try)->to_app; |
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113 | } else { |
114 | $try |
115 | } |
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116 | } elsif (!ref($try) and ref($more->[0]) eq 'CODE') { |
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117 | $self->_construct_node(match => $try, run => shift(@$more))->to_app; |
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118 | } elsif (blessed($try) && $try->can('to_app')) { |
119 | $try->to_app; |
120 | } else { |
121 | die "No idea how we got here with $try"; |
122 | } |
123 | } |
124 | |
125 | sub _construct_node { |
126 | my ($self, %args) = @_; |
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127 | $args{match} = $self->_parser->parse($args{match}); |
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128 | $self->node_class->new({ %{$self->node_args}, %args }); |
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129 | } |
130 | |
131 | 1; |