1 package Web::Dispatch::Parser;
6 if ($ENV{WEB_DISPATCH_PARSER_DEBUG}) {
7 no warnings 'redefine';
13 use Web::Dispatch::Predicates;
17 is => 'lazy', default => quote_sub q{ {} }
20 sub diag { if (DEBUG) { warn $_[0] } }
23 my ($self, $error) = @_;
24 my $hat = (' ' x (pos||0)).'^';
25 die "Error parsing dispatch specification: ${error}\n
31 my ($self, $spec) = @_;
32 $spec =~ s/\s+//g; # whitespace is not valid
33 return $self->_cache->{$spec} ||= $self->_parse_spec($spec);
37 my ($self, $spec, $nested) = @_;
41 push @match, $self->_parse_spec_section($_)
42 or $self->_blam("Unable to work out what the next section is");
44 $self->_blam("Found closing ) with no opening (") unless $nested;
47 last PARSE if (pos == length);
48 $match[-1] = $self->_parse_spec_combinator($_, $match[-1])
49 or $self->_blam('No valid combinator - expected + or |');
50 } until (pos == length) }; # accept trailing whitespace
51 if ($nested and pos == length) {
53 $self->_blam("No closing ) found for opening (");
55 return $match[0] if (@match == 1);
56 return match_and(@match);
60 sub _parse_spec_combinator {
61 my ($self, $spec, $match) = @_;
71 push @match, $self->_parse_spec_section($_)
72 or $self->_blam("Unable to work out what the next section is");
73 last PARSE if (pos == length);
74 last PARSE unless /\G\|/gc; # give up when next thing isn't |
75 } until (pos == length) }; # accept trailing whitespace
76 return match_or(@match);
82 sub _parse_spec_section {
86 # GET POST PUT HEAD ...
89 return match_method($1);
94 return $self->_url_path_match($_);
99 return match_extension($1);
104 return $self->_parse_spec($_, pos);
109 return match_not($self->_parse_spec_section($_));
113 return $self->_parse_param_handler($_, 'query');
117 return $self->_parse_param_handler($_, 'body');
119 return; # () will trigger the blam in our caller
122 sub _url_path_match {
127 PATH: while (/\G\//gc) {
133 push @path, $self->_url_path_segment_match($_)
134 or $self->_blam("Couldn't parse path match segment");
136 if (@path && !$end) {
137 length and $_ .= '(?:\.\w+)?' for $path[-1];
139 my $re = '^('.join('/','',@path).')'.$end.'$';
142 return match_path_strip($re);
144 return match_path($re);
150 sub _url_path_segment_match {
153 # trailing / -> require / on end of URL
154 /\G(?:(?=[+|\)])|$)/gc and
156 # word chars only -> exact path part match
159 # ** -> capture unlimited path parts
162 # * -> capture path part
169 sub _parse_param_handler {
170 my ($self, $spec, $type) = @_;
172 require Web::Simple::ParamParser;
173 my $unpacker = Web::Simple::ParamParser->can("get_unpacked_${type}_from");
176 my (@required, @single, %multi, $star, $multistar, %positional, $have_kw);
182 my $is_kw = /\G\:/gc;
186 my $multi = /\G\@/gc;
192 $self->_blam("* is always named; no need to supply :") if $is_kw;
194 $multi ? ($multistar = 1) : ($star = 1);
198 if ($star && $multistar) {
199 $self->_blam("Can't use * and \@* in the same parameter match");
203 # @foo= or foo= or @foo~ or foo~
205 /\G(\w+)/gc or $self->_blam('Expected parameter name');
209 # check for = or ~ on the end
212 ? push(@required, $name)
213 : (/\G\~/gc or $self->_blam('Expected = or ~ after parameter name'));
215 # record the key in the right category depending on the multi (@) flag
217 $multi ? ($multi{$name} = 1) : (push @single, $name);
219 # record positional or keyword
221 $is_kw ? ($have_kw = 1) : ($positional{$name} = $pos_idx++);
226 my $raw = $unpacker->($_[0]);
227 foreach my $name (@required) {
228 return unless exists $raw->{$name};
231 my @p = (undef) x $pos_idx;
235 ? (grep { !exists $multi{$_} } keys %$raw)
239 if (exists $raw->{$name}) {
240 if (exists $positional{$name}) {
241 $p[$positional{$name}] = $raw->{$name}->[-1];
243 $p{$name} = $raw->{$name}->[-1];
251 ? (grep { !exists $done{$_} && !exists $multi{$_} } keys %$raw)
255 if (exists $positional{$name}) {
256 $p[$positional{$name}] = $raw->{$name}||[];
258 $p{$name} = $raw->{$name}||[];
261 $p[$pos_idx] = \%p if $have_kw;