| 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/; |
| 13 |
|
| 14 |
=head1 NAME |
| 15 |
|
| 16 |
WebPAC::Parser - parse perl normalization configuration files and mungle it |
| 17 |
|
| 18 |
=head1 VERSION |
| 19 |
|
| 20 |
Version 0.06 |
| 21 |
|
| 22 |
=cut |
| 23 |
|
| 24 |
our $VERSION = '0.06'; |
| 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 ? return $self : return undef; |
| 67 |
} |
| 68 |
|
| 69 |
=head2 valid_database |
| 70 |
|
| 71 |
my $ok = $parse->valid_database('key'); |
| 72 |
|
| 73 |
=cut |
| 74 |
|
| 75 |
sub valid_database { |
| 76 |
my $self = shift; |
| 77 |
|
| 78 |
my $database = shift || return; |
| 79 |
|
| 80 |
return defined($self->{valid_inputs}->{ _q($database) }); |
| 81 |
} |
| 82 |
|
| 83 |
=head2 valid_database_input |
| 84 |
|
| 85 |
my $ok = $parse->valid_database('database_key','input_name'); |
| 86 |
|
| 87 |
=cut |
| 88 |
|
| 89 |
sub valid_database_input { |
| 90 |
my $self = shift; |
| 91 |
my ($database,$input) = @_; |
| 92 |
$input = _input_name($input); |
| 93 |
return defined($self->{valid_inputs}->{ _q($database) }->{ _q($input) }); |
| 94 |
} |
| 95 |
|
| 96 |
=head2 depends |
| 97 |
|
| 98 |
Return all databases and inputs on which specified one depends |
| 99 |
|
| 100 |
$depends_on = $parser->depends('database','input'); |
| 101 |
|
| 102 |
=cut |
| 103 |
|
| 104 |
sub depends { |
| 105 |
my $self = shift; |
| 106 |
my ($database,$input) = @_; |
| 107 |
$input = _input_name($input); |
| 108 |
$self->_get_logger->debug("depends($database,$input)"); |
| 109 |
return unless ( |
| 110 |
defined( $self->{depends}->{ _q($database) } ) && |
| 111 |
defined( $self->{depends}->{ _q($database) }->{ _q($input) } ) |
| 112 |
); |
| 113 |
return $self->{depends}->{ _q($database) }->{ _q($input) }; |
| 114 |
} |
| 115 |
|
| 116 |
=head2 have_lookup_create |
| 117 |
|
| 118 |
my @keys = $parser->have_lookup_create($database, $input); |
| 119 |
|
| 120 |
=cut |
| 121 |
|
| 122 |
sub have_lookup_create { |
| 123 |
my $self = shift; |
| 124 |
my ($database,$input) = @_; |
| 125 |
$input = _input_name($input); |
| 126 |
return unless ( |
| 127 |
defined( $self->{_lookup_create_key}->{ _q($database) } ) && |
| 128 |
defined( $self->{_lookup_create_key}->{ _q($database) }->{ _q($input) } ) |
| 129 |
); |
| 130 |
return keys %{ $self->{_lookup_create_key}->{ _q($database) }->{ _q($input) } }; |
| 131 |
} |
| 132 |
|
| 133 |
|
| 134 |
=head2 lookup_create_rules |
| 135 |
|
| 136 |
my $source = $parser->lookup_create_rules($database, $input); |
| 137 |
|
| 138 |
=cut |
| 139 |
|
| 140 |
sub lookup_create_rules { |
| 141 |
my $self = shift; |
| 142 |
my ($database,$input) = @_; |
| 143 |
$input = _input_name($input); |
| 144 |
return unless ( |
| 145 |
defined( $self->{_lookup_create}->{ _q($database) } ) && |
| 146 |
defined( $self->{_lookup_create}->{ _q($database) }->{ _q($input) } ) |
| 147 |
); |
| 148 |
return $self->{_lookup_create}->{ _q($database) }->{ _q($input) }; |
| 149 |
} |
| 150 |
|
| 151 |
=head2 normalize_rules |
| 152 |
|
| 153 |
my $source = $parser->normalize_rules($database, $input); |
| 154 |
|
| 155 |
=cut |
| 156 |
|
| 157 |
sub normalize_rules { |
| 158 |
my $self = shift; |
| 159 |
my ($database,$input) = @_; |
| 160 |
$input = _input_name($input); |
| 161 |
return unless ( |
| 162 |
defined( $self->{_normalize_source}->{ _q($database) } ) && |
| 163 |
defined( $self->{_normalize_source}->{ _q($database) }->{ _q($input) } ) |
| 164 |
); |
| 165 |
return $self->{_normalize_source}->{ _q($database) }->{ _q($input) }; |
| 166 |
} |
| 167 |
|
| 168 |
=head1 PRIVATE |
| 169 |
|
| 170 |
=head2 _read_sources |
| 171 |
|
| 172 |
my $source_files = $parser->_read_sources; |
| 173 |
|
| 174 |
Called by L</new>. |
| 175 |
|
| 176 |
=cut |
| 177 |
|
| 178 |
sub _read_sources { |
| 179 |
my $self = shift; |
| 180 |
|
| 181 |
my $log = $self->_get_logger(); |
| 182 |
|
| 183 |
my $nr = 0; |
| 184 |
|
| 185 |
my @lookups; |
| 186 |
|
| 187 |
$self->{config}->iterate_inputs( sub { |
| 188 |
my ($input, $database) = @_; |
| 189 |
|
| 190 |
$log->debug("database: $database input = ", dump($input)); |
| 191 |
|
| 192 |
foreach my $normalize (@{ $input->{normalize} }) { |
| 193 |
|
| 194 |
my $path = $normalize->{path}; |
| 195 |
return unless($path); |
| 196 |
my $full = $self->{base_path} ? $self->{base_path} . '/' . $path : $path; |
| 197 |
|
| 198 |
$log->logdie("normalization input $full doesn't exist") unless (-e $full); |
| 199 |
|
| 200 |
my $s = read_file( $full ) || $log->logdie("can't read $full: $!"); |
| 201 |
|
| 202 |
my $input_name = _input_name($input) || $log->logdie("can't deduce name of input: ", dump( $input )); |
| 203 |
|
| 204 |
$log->debug("$database/$input_name: adding $path"); |
| 205 |
|
| 206 |
$self->{valid_inputs}->{$database}->{$input_name}++; |
| 207 |
|
| 208 |
push @lookups, sub { |
| 209 |
$self->_parse_lookups( $database, $input_name, $full, $s ); |
| 210 |
}; |
| 211 |
|
| 212 |
$nr++; |
| 213 |
} |
| 214 |
} ); |
| 215 |
|
| 216 |
$log->debug("found $nr source files"); |
| 217 |
|
| 218 |
# parse all lookups |
| 219 |
$_->() foreach (@lookups); |
| 220 |
|
| 221 |
return $nr; |
| 222 |
} |
| 223 |
|
| 224 |
=head2 _parse_lookups |
| 225 |
|
| 226 |
$parser->_parse_lookups($database,$input,$path,$source); |
| 227 |
|
| 228 |
Called for each normalize source (rules) in each input by L</_read_sources> |
| 229 |
|
| 230 |
It will report invalid databases and inputs in error log after parsing. |
| 231 |
|
| 232 |
=cut |
| 233 |
|
| 234 |
sub _parse_lookups { |
| 235 |
my $self = shift; |
| 236 |
my ($database, $input, $path, $source) = @_; |
| 237 |
|
| 238 |
$input = _input_name($input); |
| 239 |
|
| 240 |
my $log = $self->_get_logger(); |
| 241 |
|
| 242 |
$log->logdie("invalid database $database" ) unless $self->valid_database( $database ); |
| 243 |
$log->logdie("invalid input $input of database $database", ) unless $self->valid_database_input( $database, $input ); |
| 244 |
|
| 245 |
$log->logdie("no source found for database $database input $input path $path") unless ($source); |
| 246 |
|
| 247 |
$log->info("parsing lookups for $database/$input from $path (",length($source)," bytes)"); |
| 248 |
|
| 249 |
my $Document = PPI::Document->new( \$source ) || $log->logdie("can't parse source:\n", $self->{source}); |
| 250 |
|
| 251 |
$Document->prune('PPI::Token::Whitespace'); |
| 252 |
$Document->prune('PPI::Token::Comment'); |
| 253 |
#$Document->prune('PPI::Token::Operator'); |
| 254 |
|
| 255 |
# Find all the named subroutines |
| 256 |
|
| 257 |
$self->{_lookup_errors} = (); |
| 258 |
|
| 259 |
sub _lookup_error { |
| 260 |
my $self = shift; |
| 261 |
my $msg = shift; |
| 262 |
$self->_get_logger->logconfess("error without message?") unless ($msg); |
| 263 |
push @{ $self->{_lookup_errors} }, $msg; |
| 264 |
return ''; |
| 265 |
} |
| 266 |
|
| 267 |
$Document->find( sub { |
| 268 |
my ($Document,$Element) = @_; |
| 269 |
|
| 270 |
$Element->isa('PPI::Token::Word') or return ''; |
| 271 |
$Element->content eq 'lookup' or return ''; |
| 272 |
|
| 273 |
$log->debug("expansion: ", $Element->snext_sibling); |
| 274 |
|
| 275 |
my $args = $Element->snext_sibling; |
| 276 |
|
| 277 |
my @e = $args->child(0)->elements; |
| 278 |
$log->logdie("hum, expect at least 8 elements, got ", scalar @e, " in $args") if ($#e < 8); |
| 279 |
|
| 280 |
if ($log->is_debug) { |
| 281 |
my $report = "found " . scalar @e . " elements:\n"; |
| 282 |
|
| 283 |
foreach my $i ( 0 .. $#e ) { |
| 284 |
$report .= sprintf("# %-2d: %-30s %s\n", $i, ( $e[$i] || 'undef' ), $e[$i]->class ); |
| 285 |
} |
| 286 |
|
| 287 |
$log->debug($report); |
| 288 |
} |
| 289 |
|
| 290 |
my $key_element = $e[8]->clone; |
| 291 |
|
| 292 |
$log->logdie("key element must be PPI::Structure::Block") unless $key_element->isa('PPI::Structure::Block'); |
| 293 |
|
| 294 |
$log->debug("key part: ", $key_element); |
| 295 |
|
| 296 |
my @key; |
| 297 |
|
| 298 |
$key_element->find( sub { |
| 299 |
my $e = $_[1] || die "no element?"; |
| 300 |
$e->isa('PPI::Token::Word') or return ''; |
| 301 |
$e->content eq 'rec' or return ''; |
| 302 |
|
| 303 |
my $kf = $e->snext_sibling; |
| 304 |
|
| 305 |
$log->debug("key fragment = $kf"); |
| 306 |
|
| 307 |
push @key, eval $kf; |
| 308 |
$log->logdie("can't eval { $kf }: $@") if ($@); |
| 309 |
|
| 310 |
return 1; |
| 311 |
}); |
| 312 |
|
| 313 |
my $key = join('-', @key ) || $log->logdie("no key found!"); |
| 314 |
|
| 315 |
$log->debug("key = $key"); |
| 316 |
|
| 317 |
return $self->_lookup_error("invalid database $e[3] in $path" ) unless $self->valid_database( $e[3] ); |
| 318 |
return $self->_lookup_error("invalid input $e[5] of database $e[3] in $path", ) unless $self->valid_database_input( $e[3], $e[5] ); |
| 319 |
|
| 320 |
my $create = qq{ |
| 321 |
save_into_lookup($e[3],$e[5],'$key', $e[7] $e[8] ); |
| 322 |
}; |
| 323 |
|
| 324 |
$log->debug("create: $create"); |
| 325 |
|
| 326 |
# save code to create this lookup |
| 327 |
$self->{_lookup_create}->{ _q($e[3]) }->{ _q($e[5]) } .= $create; |
| 328 |
$self->{_lookup_create_key}->{ _q($e[3]) }->{ _q($e[5]) }->{ _q($key) }++; |
| 329 |
|
| 330 |
|
| 331 |
if (defined( $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{ $key } )) { |
| 332 |
$log->warn("dependency of $database/$input on $e[3]/$e[5] with $key allready recorded"); |
| 333 |
} |
| 334 |
|
| 335 |
# save this dependency |
| 336 |
$self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{$key}++; |
| 337 |
|
| 338 |
if ($#e < 10) { |
| 339 |
$e[8]->insert_after( $e[8]->clone ); |
| 340 |
$e[8]->insert_after( $e[7]->clone ); |
| 341 |
$e[8]->insert_after( $e[6]->clone ); |
| 342 |
} |
| 343 |
|
| 344 |
$e[7]->remove; |
| 345 |
$e[8]->insert_before( new PPI::Token::Quote::Single( "'$key'" ) ); |
| 346 |
$e[8]->remove; |
| 347 |
|
| 348 |
|
| 349 |
$log->debug(">>> ", $Element->snext_sibling); |
| 350 |
}); |
| 351 |
|
| 352 |
my $normalize_source = $Document->serialize; |
| 353 |
$log->debug("create: ", dump($self->{_lookup_create}) ); |
| 354 |
$log->debug("normalize: $normalize_source"); |
| 355 |
|
| 356 |
$self->{_normalize_source}->{$database}->{$input} .= $normalize_source; |
| 357 |
|
| 358 |
if ($self->{debug}) { |
| 359 |
my $Dumper = PPI::Dumper->new( $Document ); |
| 360 |
$Dumper->print; |
| 361 |
} |
| 362 |
|
| 363 |
$log->error("Parser errors:\n", join("\n",@{ $self->{_lookup_errors} }) ) if ($self->{_lookup_errors}); |
| 364 |
|
| 365 |
return 1; |
| 366 |
} |
| 367 |
|
| 368 |
|
| 369 |
=head2 _q |
| 370 |
|
| 371 |
Strip single or double quotes around value |
| 372 |
|
| 373 |
_q(qq/'foo'/) -> foo |
| 374 |
|
| 375 |
=cut |
| 376 |
|
| 377 |
sub _q { |
| 378 |
my $v = shift || return; |
| 379 |
$v =~ s/^['"]*//g; |
| 380 |
$v =~ s/['"]*$//g; |
| 381 |
return $v; |
| 382 |
} |
| 383 |
|
| 384 |
=head2 _input_name |
| 385 |
|
| 386 |
Return C<name> value if HASH or arg if scalar |
| 387 |
|
| 388 |
_input_name($input) |
| 389 |
|
| 390 |
=cut |
| 391 |
|
| 392 |
sub _input_name { |
| 393 |
my $input = shift || return; |
| 394 |
if (ref($input) eq 'HASH') { |
| 395 |
die "can't find 'name' value in ", dump($input) unless defined($input->{name}); |
| 396 |
return $input->{name}; |
| 397 |
} else { |
| 398 |
return $input; |
| 399 |
} |
| 400 |
} |
| 401 |
|
| 402 |
|
| 403 |
=head1 AUTHOR |
| 404 |
|
| 405 |
Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
| 406 |
|
| 407 |
=head1 COPYRIGHT & LICENSE |
| 408 |
|
| 409 |
Copyright 2006 Dobrica Pavlinusic, All Rights Reserved. |
| 410 |
|
| 411 |
This program is free software; you can redistribute it and/or modify it |
| 412 |
under the same terms as Perl itself. |
| 413 |
|
| 414 |
=cut |
| 415 |
|
| 416 |
1; # End of WebPAC::Parser |
Parent Directory
| 
Revision Log