1 |
package WebPAC::Parser; |
2 |
|
3 |
use warnings; |
4 |
use strict; |
5 |
|
6 |
|
7 |
use PPI; |
8 |
use PPI::Dumper; |
9 |
use Data::Dump qw/dump/; |
10 |
use File::Slurp; |
11 |
|
12 |
use base qw/WebPAC::Common WebPAC::Normalize/; |
13 |
|
14 |
=head1 NAME |
15 |
|
16 |
WebPAC::Parser - parse perl normalization configuration files and mungle it |
17 |
|
18 |
=head1 VERSION |
19 |
|
20 |
Version 0.04 |
21 |
|
22 |
=cut |
23 |
|
24 |
our $VERSION = '0.04'; |
25 |
|
26 |
=head1 SYNOPSIS |
27 |
|
28 |
This module will parse L<WebPAC::Normalize/lookup> directives and generate source |
29 |
to produce lookups and normalization. |
30 |
|
31 |
It's written using L<PPI>, pure-perl parser for perl and heavily influenced by |
32 |
reading about LISP. It might be a bit over-the board, but at least it removed |
33 |
separate configuration files for lookups. |
34 |
|
35 |
This is experimental code, but it replaces all older formats which where, |
36 |
at one point in time, available in WebPAC. |
37 |
|
38 |
FIXME |
39 |
|
40 |
=head1 FUNCTIONS |
41 |
|
42 |
=head2 new |
43 |
|
44 |
Create new parser object. |
45 |
|
46 |
my $parser = new WebPAC::Parser( |
47 |
config => new WebPAC::Config(), |
48 |
base_path => '/optional/path/to/conf', |
49 |
); |
50 |
|
51 |
=cut |
52 |
|
53 |
sub new { |
54 |
my $class = shift; |
55 |
my $self = {@_}; |
56 |
bless($self, $class); |
57 |
|
58 |
my $log = $self->_get_logger(); |
59 |
|
60 |
$log->logdie("config isn't WebPAC::Config") unless ($self->{config} && $self->{config}->isa('WebPAC::Config')); |
61 |
|
62 |
$log->logdie("can't iterate_inputs over this config object") unless ($self->{config}->can('iterate_inputs')); |
63 |
|
64 |
$self->read_sources; |
65 |
|
66 |
$self->{config}->iterate_inputs( sub { |
67 |
my ($input, $database) = @_; |
68 |
return unless $self->valid_database_input($database, _input_name($input)); |
69 |
$self->parse_lookups($database, _input_name($input)); |
70 |
} ); |
71 |
|
72 |
$self ? return $self : return undef; |
73 |
} |
74 |
|
75 |
=head2 read_sources |
76 |
|
77 |
my $source_files = $parser->read_sources; |
78 |
|
79 |
Called by L</new>. |
80 |
|
81 |
=cut |
82 |
|
83 |
sub _input_name($); |
84 |
|
85 |
sub read_sources { |
86 |
my $self = shift; |
87 |
|
88 |
my $log = $self->_get_logger(); |
89 |
|
90 |
my $nr = 0; |
91 |
|
92 |
$self->{config}->iterate_inputs( sub { |
93 |
my ($input, $database) = @_; |
94 |
|
95 |
my @normalize; |
96 |
|
97 |
if (ref($input->{normalize}) eq 'ARRAY') { |
98 |
@normalize = @{ $input->{normalize} }; |
99 |
} else { |
100 |
@normalize = ( $input->{normalize} ); |
101 |
} |
102 |
|
103 |
foreach my $normalize (@normalize) { |
104 |
|
105 |
my $path = $normalize->{path}; |
106 |
return unless($path); |
107 |
my $full = $self->{base_path} ? $self->{base_path} . '/' . $path : $path; |
108 |
|
109 |
$log->logdie("normalization input $full doesn't exist") unless (-e $full); |
110 |
|
111 |
my $s = read_file( $full ) || $log->logdie("can't read $full: $!"); |
112 |
|
113 |
my $input_name = _input_name($input) || $log->logdie("can't deduce name of input: ", dump( $input )); |
114 |
|
115 |
$log->debug("$database/$input_name: adding $path"); |
116 |
|
117 |
$self->{valid_inputs}->{$database}->{$input_name} = { |
118 |
source => $s, |
119 |
path => $full, |
120 |
usage => 0, |
121 |
} unless defined($self->{valid_inputs}->{$database}->{$input_name}); |
122 |
|
123 |
$self->{valid_inputs}->{$database}->{$input_name}->{usage}++; |
124 |
|
125 |
$nr++; |
126 |
} |
127 |
} ); |
128 |
|
129 |
$log->debug("found $nr source files"); |
130 |
|
131 |
return $nr; |
132 |
} |
133 |
|
134 |
=head2 parse_lookups |
135 |
|
136 |
$parser->parse_lookups($database,$input); |
137 |
|
138 |
Called for each input by L</new> |
139 |
|
140 |
It will report invalid databases and inputs in error log after parsing. |
141 |
|
142 |
=cut |
143 |
|
144 |
sub parse_lookups { |
145 |
my $self = shift; |
146 |
my ($database, $input) = @_; |
147 |
|
148 |
$input = _input_name($input); |
149 |
|
150 |
my $log = $self->_get_logger(); |
151 |
|
152 |
$log->logdie("invalid database $database" ) unless $self->valid_database( $database ); |
153 |
$log->logdie("invalid input $input of database $database", ) unless $self->valid_database_input( $database, $input ); |
154 |
|
155 |
my $source = $self->{valid_inputs}->{$database}->{$input}->{source}; |
156 |
my $path = $self->{valid_inputs}->{$database}->{$input}->{path}; |
157 |
|
158 |
$log->logdie("no source found for database $database input $input path $path") unless ($source); |
159 |
|
160 |
$log->info("parsing lookups for $database/$input from $path"); |
161 |
|
162 |
my $Document = PPI::Document->new( \$source ) || $log->logdie("can't parse source:\n", $self->{source}); |
163 |
|
164 |
$Document->prune('PPI::Token::Whitespace'); |
165 |
#$Document->prune('PPI::Token::Operator'); |
166 |
|
167 |
# Find all the named subroutines |
168 |
|
169 |
$self->{_lookup_errors} = (); |
170 |
|
171 |
sub _lookup_error { |
172 |
my $self = shift; |
173 |
my $msg = shift; |
174 |
$self->_get_logger->logconfess("error without message?") unless ($msg); |
175 |
push @{ $self->{_lookup_errors} }, $msg; |
176 |
return ''; |
177 |
} |
178 |
|
179 |
$Document->find( sub { |
180 |
my ($Document,$Element) = @_; |
181 |
|
182 |
$Element->isa('PPI::Token::Word') or return ''; |
183 |
$Element->content eq 'lookup' or return ''; |
184 |
|
185 |
$log->debug("expansion: ", $Element->snext_sibling); |
186 |
|
187 |
my $args = $Element->snext_sibling; |
188 |
|
189 |
my @e = $args->child(0)->elements; |
190 |
$log->logdie("hum, expect at least 8 elements, got ", scalar @e, " in $args") if ($#e < 8); |
191 |
|
192 |
if ($log->is_debug) { |
193 |
my $report = "found " . scalar @e . " elements:\n"; |
194 |
|
195 |
foreach my $i ( 0 .. $#e ) { |
196 |
$report .= sprintf("# %-2d: %-30s %s\n", $i, ( $e[$i] || 'undef' ), $e[$i]->class ); |
197 |
} |
198 |
|
199 |
$log->debug($report); |
200 |
} |
201 |
|
202 |
my $key_element = $e[8]->clone; |
203 |
|
204 |
$log->logdie("key element must be PPI::Structure::Block") unless $key_element->isa('PPI::Structure::Block'); |
205 |
|
206 |
$log->debug("key part: ", $key_element); |
207 |
|
208 |
my @key; |
209 |
|
210 |
$key_element->find( sub { |
211 |
my $e = $_[1] || die "no element?"; |
212 |
$e->isa('PPI::Token::Word') or return ''; |
213 |
$e->content eq 'rec' or return ''; |
214 |
|
215 |
my $kf = $e->snext_sibling; |
216 |
|
217 |
$log->debug("key fragment = $kf"); |
218 |
|
219 |
push @key, eval $kf; |
220 |
$log->logdie("can't eval { $kf }: $@") if ($@); |
221 |
|
222 |
return 1; |
223 |
}); |
224 |
|
225 |
my $key = join('-', @key ) || $log->logdie("no key found!"); |
226 |
|
227 |
$log->debug("key = $key"); |
228 |
|
229 |
my $create = ' |
230 |
$coderef = ' . $e[7] . $e[8] . '; |
231 |
foreach my $v ($coderef->()) { |
232 |
next unless (defined($v) && $v ne \'\'); |
233 |
push @{ $lookup->{\'' . $key . '\'}->{$v} }, $mfn; |
234 |
} |
235 |
'; |
236 |
|
237 |
$log->debug("create: $create"); |
238 |
|
239 |
return $self->_lookup_error("invalid database $e[3] in $path" ) unless $self->valid_database( $e[3] ); |
240 |
return $self->_lookup_error("invalid input $e[5] of database $e[3] in $path", ) unless $self->valid_database_input( $e[3], $e[5] ); |
241 |
|
242 |
# save code to create this lookup |
243 |
$self->{_lookup_create}->{ _q($e[3]) }->{ _q($e[5]) }->{ _q($key) } .= $create; |
244 |
|
245 |
|
246 |
if (defined( $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) } )) { |
247 |
my $dep_key = $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }; |
248 |
$log->warn("dependency of $database/$input on $e[3]/$e[5] allready recorded as $dep_key, now changed to $key") if ($dep_key ne $key); |
249 |
} |
250 |
|
251 |
# save this dependency |
252 |
$self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) } .= $key; |
253 |
|
254 |
if ($#e < 10) { |
255 |
$e[8]->insert_after( $e[8]->clone ); |
256 |
$e[8]->insert_after( $e[7]->clone ); |
257 |
$e[8]->insert_after( $e[6]->clone ); |
258 |
} |
259 |
|
260 |
$e[7]->remove; |
261 |
$e[8]->insert_before( new PPI::Token::Quote::Single( "'$key'" ) ); |
262 |
$e[8]->remove; |
263 |
|
264 |
|
265 |
$log->debug(">>> ", $Element->snext_sibling); |
266 |
}); |
267 |
|
268 |
my $normalize_source = $Document->serialize; |
269 |
$log->debug("create: ", dump($self->{_lookup_create}) ); |
270 |
$log->debug("normalize: $normalize_source"); |
271 |
|
272 |
$self->{_normalize_source}->{$database}->{$input} = $normalize_source; |
273 |
|
274 |
if ($self->{debug}) { |
275 |
my $Dumper = PPI::Dumper->new( $Document ); |
276 |
$Dumper->print; |
277 |
} |
278 |
|
279 |
$log->error("Parser errors:\n", join("\n",@{ $self->{_lookup_errors} }) ) if ($self->{_lookup_errors}); |
280 |
|
281 |
return 1; |
282 |
} |
283 |
|
284 |
|
285 |
=head2 lookup_create_rules |
286 |
|
287 |
my $source = $parser->lookup_create_rules($database, $input); |
288 |
|
289 |
=cut |
290 |
|
291 |
sub lookup_create_rules { |
292 |
my $self = shift; |
293 |
my ($database,$input) = @_; |
294 |
return $self->{_lookup_create}->{ _q($database) }->{ _q($input) }; |
295 |
} |
296 |
|
297 |
=head2 valid_database |
298 |
|
299 |
my $ok = $parse->valid_database('key'); |
300 |
|
301 |
=cut |
302 |
|
303 |
sub valid_database { |
304 |
my $self = shift; |
305 |
|
306 |
my $database = shift || return; |
307 |
|
308 |
return defined($self->{valid_inputs}->{ _q($database) }); |
309 |
} |
310 |
|
311 |
=head2 valid_database_input |
312 |
|
313 |
my $ok = $parse->valid_database('database_key','input_name'); |
314 |
|
315 |
=cut |
316 |
|
317 |
sub valid_database_input { |
318 |
my $self = shift; |
319 |
|
320 |
my ($database,$input) = @_; |
321 |
return defined($self->{valid_inputs}->{ _q($database) }->{ _q($input) }); |
322 |
} |
323 |
|
324 |
=head2 depends |
325 |
|
326 |
Return all databases and inputs on which specified one depends |
327 |
|
328 |
$depends_on = $parser->depends('database','input'); |
329 |
|
330 |
=cut |
331 |
|
332 |
sub depends { |
333 |
my $self = shift; |
334 |
my ($database,$input) = @_; |
335 |
$self->_get_logger->debug("depends($database,$input)"); |
336 |
return unless defined( $self->{depends}->{ _q($database) }->{ _q($input) } ); |
337 |
return $self->{depends}->{ _q($database) }->{ _q($input) }; |
338 |
} |
339 |
|
340 |
=head1 PRIVATE |
341 |
|
342 |
=head2 _q |
343 |
|
344 |
Strip single or double quotes around value |
345 |
|
346 |
_q(qq/'foo'/) -> foo |
347 |
|
348 |
=cut |
349 |
|
350 |
sub _q { |
351 |
my $v = shift || return; |
352 |
$v =~ s/^['"]*//g; |
353 |
$v =~ s/['"]*$//g; |
354 |
return $v; |
355 |
} |
356 |
|
357 |
=head2 _input_name |
358 |
|
359 |
Return C<name> value if HASH or arg if scalar |
360 |
|
361 |
_input_name($input) |
362 |
|
363 |
=cut |
364 |
|
365 |
sub _input_name { |
366 |
my $input = shift || return; |
367 |
if (ref($input) eq 'HASH') { |
368 |
die "can't find 'name' value in ", dump($input) unless defined($input->{name}); |
369 |
return $input->{name}; |
370 |
} else { |
371 |
return $input; |
372 |
} |
373 |
} |
374 |
|
375 |
|
376 |
=head1 AUTHOR |
377 |
|
378 |
Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
379 |
|
380 |
=head1 COPYRIGHT & LICENSE |
381 |
|
382 |
Copyright 2006 Dobrica Pavlinusic, All Rights Reserved. |
383 |
|
384 |
This program is free software; you can redistribute it and/or modify it |
385 |
under the same terms as Perl itself. |
386 |
|
387 |
=cut |
388 |
|
389 |
1; # End of WebPAC::Parser |