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package WebPAC::Parser; |
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use warnings; |
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use strict; |
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use PPI; |
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use PPI::Dumper; |
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use Data::Dump qw/dump/; |
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use File::Slurp; |
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use base qw/WebPAC::Common/; |
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=head1 NAME |
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WebPAC::Parser - parse perl normalization configuration files (rules) and mungle it |
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=head1 VERSION |
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Version 0.08 |
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=cut |
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our $VERSION = '0.08'; |
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=head1 SYNOPSIS |
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This module will parse L<WebPAC::Normalize/lookup> directives and generate source |
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to produce lookups and normalization. It will also parse other parts of |
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source to produce some of DWIM (I<Do What I Mean>) magic |
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(like producing MARC oputput using L<WebPAC::Output::MARC> if there are C<marc_*> |
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rules in normalisation). |
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It's written using L<PPI>, pure-perl parser for perl and heavily influenced by |
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reading about LISP. It might be a bit over-the board, but at least it removed |
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separate configuration files for lookups. |
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This is experimental code, but it replaces all older formats which where, |
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at one point in time, available in WebPAC. |
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FIXME |
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=head1 FUNCTIONS |
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=head2 new |
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Create new parser object. |
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my $parser = new WebPAC::Parser( |
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config => new WebPAC::Config(), |
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base_path => '/optional/path/to/conf', |
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only_database => $only |
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); |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {@_}; |
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bless($self, $class); |
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my $log = $self->_get_logger(); |
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$log->logdie("config isn't WebPAC::Config") unless ($self->{config} && $self->{config}->isa('WebPAC::Config')); |
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$log->logdie("can't iterate_inputs over this config object") unless ($self->{config}->can('iterate_inputs')); |
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$self->_read_sources; |
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$self ? return $self : return undef; |
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} |
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=head2 valid_database |
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my $ok = $parse->valid_database('key'); |
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=cut |
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sub valid_database { |
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my $self = shift; |
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my $database = shift || return; |
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return defined($self->{valid_inputs}->{ _q($database) }); |
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} |
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=head2 valid_database_input |
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my $ok = $parse->valid_database('database_key','input_name'); |
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=cut |
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sub valid_database_input { |
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my $self = shift; |
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my ($database,$input) = @_; |
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$input = _input_name($input); |
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return defined($self->{valid_inputs}->{ _q($database) }->{ _q($input) }); |
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} |
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=head2 depends |
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Return all databases and inputs on which specified one depends |
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$depends_on = $parser->depends('database','input'); |
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=cut |
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sub depends { |
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my $self = shift; |
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my ($database,$input) = @_; |
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$input = _input_name($input); |
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$self->_get_logger->debug("depends($database,$input)"); |
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return unless ( |
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defined( $self->{depends}->{ _q($database) } ) && |
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defined( $self->{depends}->{ _q($database) }->{ _q($input) } ) |
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); |
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return $self->{depends}->{ _q($database) }->{ _q($input) }; |
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} |
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=head2 have_lookup_create |
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my @keys = $parser->have_lookup_create($database, $input); |
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=cut |
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sub have_lookup_create { |
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my $self = shift; |
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my ($database,$input) = @_; |
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$input = _input_name($input); |
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return unless ( |
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defined( $self->{_lookup_create_key}->{ _q($database) } ) && |
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defined( $self->{_lookup_create_key}->{ _q($database) }->{ _q($input) } ) |
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); |
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return keys %{ $self->{_lookup_create_key}->{ _q($database) }->{ _q($input) } }; |
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} |
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=head2 lookup_create_rules |
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my $source = $parser->lookup_create_rules($database, $input); |
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=cut |
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sub lookup_create_rules { |
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my $self = shift; |
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my ($database,$input) = @_; |
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$input = _input_name($input); |
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return unless ( |
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defined( $self->{_lookup_create}->{ _q($database) } ) && |
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defined( $self->{_lookup_create}->{ _q($database) }->{ _q($input) } ) |
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); |
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return $self->{_lookup_create}->{ _q($database) }->{ _q($input) }; |
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} |
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=head2 normalize_rules |
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my $source = $parser->normalize_rules($database, $input); |
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=cut |
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sub normalize_rules { |
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my $self = shift; |
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my ($database,$input) = @_; |
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$input = _input_name($input); |
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return unless ( |
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defined( $self->{_normalize_source}->{ _q($database) } ) && |
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defined( $self->{_normalize_source}->{ _q($database) }->{ _q($input) } ) |
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); |
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return $self->{_normalize_source}->{ _q($database) }->{ _q($input) }; |
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} |
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=head2 have_rules |
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my $do_marc = $parser->have_rules('marc', $database, $input); |
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my $do_index = $parser->have_rules('search', $database); |
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This function will return hash containing count of all found C<marc_*> or |
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C<search> directives. Input name is optional. |
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=cut |
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sub have_rules { |
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my $self = shift; |
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my $log = $self->_get_logger(); |
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my $type = shift @_ || $log->logconfess("need at least type"); |
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my $database = shift @_ || $log->logconfess("database is required"); |
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my $input = shift @_; |
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$input = _input_name($input); |
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return unless defined( $self->{_have_rules}->{ _q($database) } ); |
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my $database_rules = $self->{_have_rules}->{ _q($database ) }; |
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if (defined($input)) { |
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return unless ( |
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defined( $database_rules->{ _q($input) } ) && |
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defined( $database_rules->{ _q($input) }->{ $type } ) |
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); |
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return $database_rules->{ _q($input) }->{ $type }; |
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} |
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my $usage; |
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foreach my $i (keys %{ $database_rules }) { |
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next unless defined( $database_rules->{$i}->{$type} ); |
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foreach my $t (keys %{ $database_rules->{ $i }->{$type} }) { |
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$usage->{ $t } += $database_rules->{ $i }->{ $t }; |
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} |
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} |
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return $usage; |
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} |
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=head1 PRIVATE |
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=head2 _read_sources |
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my $source_files = $parser->_read_sources; |
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Called by L</new>. |
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=cut |
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sub _read_sources { |
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my $self = shift; |
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my $log = $self->_get_logger(); |
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my $nr = 0; |
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my @sources; |
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my $lookup_src_cache; |
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my $only_database = $self->{only_database}; |
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my $only_input = $self->{only_input}; |
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$self->{config}->iterate_inputs( sub { |
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my ($input, $database) = @_; |
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return if ( $only_database && $database !~ m/$only_database/i ); |
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return if ( $only_input && $input->{name} !~ m/$only_input/i ); |
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$log->debug("database: $database input = ", dump($input)); |
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foreach my $normalize (@{ $input->{normalize} }) { |
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my $path = $normalize->{path}; |
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return unless($path); |
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my $full = $self->{base_path} ? $self->{base_path} . '/' . $path : $path; |
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$log->logdie("normalization input $full doesn't exist") unless (-e $full); |
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my $s = read_file( $full ) || $log->logdie("can't read $full: $!"); |
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my $input_name = _input_name($input) || $log->logdie("can't deduce name of input: ", dump( $input )); |
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$log->debug("$database/$input_name: adding $path"); |
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$self->{valid_inputs}->{$database}->{$input_name}++; |
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push @sources, sub { |
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#warn "### $database $input_name, $full ###\n"; |
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$self->_parse_source( $database, $input_name, $full, $s ); |
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}; |
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$nr++; |
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} |
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} ); |
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$log->debug("found $nr source files"); |
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# parse all sources |
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$_->() foreach (@sources); |
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return $nr; |
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} |
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=head2 _parse_source |
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$parser->_parse_source($database,$input,$path,$source); |
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Called for each normalize source (rules) in each input by L</_read_sources> |
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It will report invalid databases and inputs in error log after parsing. |
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=cut |
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sub _parse_source { |
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my $self = shift; |
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my ($database, $input, $path, $source) = @_; |
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$input = _input_name($input); |
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my $log = $self->_get_logger(); |
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$log->logdie("invalid database $database" ) unless $self->valid_database( $database ); |
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$log->logdie("invalid input $input of database $database", ) unless $self->valid_database_input( $database, $input ); |
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$log->logdie("no source found for database $database input $input path $path") unless ($source); |
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$log->info("parsing lookups for $database/$input from $path (",length($source)," bytes)"); |
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my $Document = PPI::Document->new( \$source ) || $log->logdie("can't parse source:\n", $self->{source}); |
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$Document->prune('PPI::Token::Whitespace'); |
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$Document->prune('PPI::Token::Comment'); |
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#$Document->prune('PPI::Token::Operator'); |
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# Find all the named subroutines |
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$self->{_lookup_errors} = (); |
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sub _lookup_error { |
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my $self = shift; |
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my $msg = shift; |
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$self->_get_logger->logconfess("error without message?") unless ($msg); |
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push @{ $self->{_lookup_errors} }, $msg; |
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return ''; |
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} |
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$Document->find( sub { |
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my ($Document,$Element) = @_; |
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$Element->isa('PPI::Token::Word') or return ''; |
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if ( $Element->content eq 'sub' ) { |
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# repair demage done by prune of whitespace |
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$Element->insert_after( PPI::Token::Whitespace->new(' ') ); |
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return ''; |
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} |
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$Element->content eq 'lookup' or return ''; |
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$log->debug("expansion: ", $Element->snext_sibling); |
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my $args = $Element->snext_sibling; |
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my @e = $args->child(0)->elements; |
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$log->logdie("hum, expect at least 8 elements, got ", scalar @e, " in $args") if ($#e < 8); |
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if ($log->is_debug) { |
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my $report = "found " . scalar @e . " elements:\n"; |
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foreach my $i ( 0 .. $#e ) { |
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$report .= sprintf("# %-2d: %-30s %s\n", $i, ( $e[$i] || 'undef' ), $e[$i]->class ); |
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} |
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$log->debug($report); |
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} |
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my $key_element = $e[8]->clone; |
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$log->logdie("key element must be PPI::Structure::Block") unless $key_element->isa('PPI::Structure::Block'); |
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$log->debug("key part: ", $key_element); |
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my @key; |
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$key_element->find( sub { |
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my $e = $_[1] || die "no element?"; |
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$e->isa('PPI::Token::Word') or return ''; |
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$e->content eq 'rec' or return ''; |
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my $kf = $e->snext_sibling; |
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$log->debug("key fragment = $kf"); |
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push @key, eval $kf; |
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$log->logdie("can't eval { $kf }: $@") if ($@); |
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|
return 1; |
382 |
|
|
}); |
383 |
|
|
|
384 |
dpavlin |
687 |
my $key = join('-', @key ) || $log->logdie("no key found!"); |
385 |
dpavlin |
686 |
|
386 |
dpavlin |
687 |
$log->debug("key = $key"); |
387 |
dpavlin |
686 |
|
388 |
dpavlin |
712 |
return $self->_lookup_error("invalid database $e[3] in $path" ) unless $self->valid_database( $e[3] ); |
389 |
|
|
return $self->_lookup_error("invalid input $e[5] of database $e[3] in $path", ) unless $self->valid_database_input( $e[3], $e[5] ); |
390 |
dpavlin |
686 |
|
391 |
dpavlin |
712 |
my $create = qq{ |
392 |
|
|
save_into_lookup($e[3],$e[5],'$key', $e[7] $e[8] ); |
393 |
|
|
}; |
394 |
|
|
|
395 |
dpavlin |
687 |
$log->debug("create: $create"); |
396 |
dpavlin |
686 |
|
397 |
dpavlin |
698 |
# save code to create this lookup |
398 |
dpavlin |
706 |
$self->{_lookup_create}->{ _q($e[3]) }->{ _q($e[5]) } .= $create; |
399 |
|
|
$self->{_lookup_create_key}->{ _q($e[3]) }->{ _q($e[5]) }->{ _q($key) }++; |
400 |
dpavlin |
686 |
|
401 |
dpavlin |
698 |
|
402 |
dpavlin |
702 |
if (defined( $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{ $key } )) { |
403 |
|
|
$log->warn("dependency of $database/$input on $e[3]/$e[5] with $key allready recorded"); |
404 |
dpavlin |
698 |
} |
405 |
|
|
|
406 |
|
|
# save this dependency |
407 |
dpavlin |
702 |
$self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{$key}++; |
408 |
dpavlin |
698 |
|
409 |
dpavlin |
686 |
if ($#e < 10) { |
410 |
|
|
$e[8]->insert_after( $e[8]->clone ); |
411 |
|
|
$e[8]->insert_after( $e[7]->clone ); |
412 |
|
|
$e[8]->insert_after( $e[6]->clone ); |
413 |
|
|
} |
414 |
|
|
|
415 |
|
|
$e[7]->remove; |
416 |
dpavlin |
1061 |
$e[8]->insert_before( PPI::Token::Quote::Single->new( "'$key'" ) ); |
417 |
dpavlin |
686 |
$e[8]->remove; |
418 |
|
|
|
419 |
|
|
|
420 |
dpavlin |
687 |
$log->debug(">>> ", $Element->snext_sibling); |
421 |
dpavlin |
686 |
}); |
422 |
|
|
|
423 |
dpavlin |
693 |
my $normalize_source = $Document->serialize; |
424 |
dpavlin |
692 |
$log->debug("create: ", dump($self->{_lookup_create}) ); |
425 |
dpavlin |
693 |
$log->debug("normalize: $normalize_source"); |
426 |
dpavlin |
686 |
|
427 |
dpavlin |
720 |
$self->{_normalize_source}->{$database}->{$input} .= $normalize_source; |
428 |
dpavlin |
692 |
|
429 |
dpavlin |
687 |
if ($self->{debug}) { |
430 |
|
|
my $Dumper = PPI::Dumper->new( $Document ); |
431 |
|
|
$Dumper->print; |
432 |
|
|
} |
433 |
dpavlin |
686 |
|
434 |
dpavlin |
692 |
$log->error("Parser errors:\n", join("\n",@{ $self->{_lookup_errors} }) ) if ($self->{_lookup_errors}); |
435 |
dpavlin |
690 |
|
436 |
dpavlin |
737 |
$Document->find( sub { |
437 |
|
|
my ($Document,$Element) = @_; |
438 |
|
|
|
439 |
|
|
$Element->isa('PPI::Token::Word') or return ''; |
440 |
dpavlin |
755 |
if ($Element->content =~ m/^(marc|search)/) { |
441 |
|
|
my $what = $1; |
442 |
|
|
$log->debug("found $what rules in $database/$input"); |
443 |
|
|
$self->{_have_rules}->{ $database }->{ $input }->{ $what }->{ $Element->content }++; |
444 |
|
|
} else { |
445 |
|
|
return ''; |
446 |
|
|
} |
447 |
dpavlin |
737 |
}); |
448 |
|
|
|
449 |
dpavlin |
687 |
return 1; |
450 |
dpavlin |
686 |
} |
451 |
|
|
|
452 |
dpavlin |
692 |
|
453 |
dpavlin |
698 |
=head2 _q |
454 |
|
|
|
455 |
|
|
Strip single or double quotes around value |
456 |
|
|
|
457 |
|
|
_q(qq/'foo'/) -> foo |
458 |
|
|
|
459 |
|
|
=cut |
460 |
|
|
|
461 |
|
|
sub _q { |
462 |
|
|
my $v = shift || return; |
463 |
|
|
$v =~ s/^['"]*//g; |
464 |
|
|
$v =~ s/['"]*$//g; |
465 |
|
|
return $v; |
466 |
|
|
} |
467 |
|
|
|
468 |
|
|
=head2 _input_name |
469 |
|
|
|
470 |
|
|
Return C<name> value if HASH or arg if scalar |
471 |
|
|
|
472 |
|
|
_input_name($input) |
473 |
|
|
|
474 |
|
|
=cut |
475 |
|
|
|
476 |
|
|
sub _input_name { |
477 |
|
|
my $input = shift || return; |
478 |
|
|
if (ref($input) eq 'HASH') { |
479 |
|
|
die "can't find 'name' value in ", dump($input) unless defined($input->{name}); |
480 |
|
|
return $input->{name}; |
481 |
|
|
} else { |
482 |
|
|
return $input; |
483 |
|
|
} |
484 |
|
|
} |
485 |
|
|
|
486 |
|
|
|
487 |
dpavlin |
686 |
=head1 AUTHOR |
488 |
|
|
|
489 |
|
|
Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
490 |
|
|
|
491 |
|
|
=head1 COPYRIGHT & LICENSE |
492 |
|
|
|
493 |
|
|
Copyright 2006 Dobrica Pavlinusic, All Rights Reserved. |
494 |
|
|
|
495 |
|
|
This program is free software; you can redistribute it and/or modify it |
496 |
|
|
under the same terms as Perl itself. |
497 |
|
|
|
498 |
|
|
=cut |
499 |
|
|
|
500 |
|
|
1; # End of WebPAC::Parser |