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package WebPAC::Parser; |
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|
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use warnings; |
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use strict; |
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|
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|
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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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|
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use base qw/WebPAC::Common/; |
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|
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=head1 NAME |
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|
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WebPAC::Parser - parse perl normalization configuration files (rules) and mungle it |
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|
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=head1 VERSION |
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|
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Version 0.08 |
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|
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=cut |
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|
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our $VERSION = '0.08'; |
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|
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=head1 SYNOPSIS |
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|
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This module will parse L<WebPAC::Normalize/lookup> directives and generate source |
| 29 |
to produce lookups and normalization. It will also parse other parts of |
| 30 |
source to produce some of DWIM (I<Do What I Mean>) magic |
| 31 |
(like producing MARC oputput using L<WebPAC::Output::MARC> if there are C<marc_*> |
| 32 |
rules in normalisation). |
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|
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It's written using L<PPI>, pure-perl parser for perl and heavily influenced by |
| 35 |
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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|
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This is experimental code, but it replaces all older formats which where, |
| 39 |
at one point in time, available in WebPAC. |
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|
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FIXME |
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|
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=head1 FUNCTIONS |
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|
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=head2 new |
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|
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Create new parser object. |
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|
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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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); |
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|
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=cut |
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|
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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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|
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my $log = $self->_get_logger(); |
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|
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$log->logdie("config isn't WebPAC::Config") unless ($self->{config} && $self->{config}->isa('WebPAC::Config')); |
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|
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$log->logdie("can't iterate_inputs over this config object") unless ($self->{config}->can('iterate_inputs')); |
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|
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$self->_read_sources; |
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|
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$self ? return $self : return undef; |
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} |
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|
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=head2 valid_database |
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|
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my $ok = $parse->valid_database('key'); |
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|
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=cut |
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|
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sub valid_database { |
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my $self = shift; |
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|
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my $database = shift || return; |
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|
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return defined($self->{valid_inputs}->{ _q($database) }); |
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} |
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|
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=head2 valid_database_input |
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|
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my $ok = $parse->valid_database('database_key','input_name'); |
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|
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=cut |
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|
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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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|
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=head2 depends |
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|
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Return all databases and inputs on which specified one depends |
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|
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$depends_on = $parser->depends('database','input'); |
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|
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=cut |
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|
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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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|
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=head2 have_lookup_create |
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|
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my @keys = $parser->have_lookup_create($database, $input); |
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|
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=cut |
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|
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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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|
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|
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=head2 lookup_create_rules |
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|
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my $source = $parser->lookup_create_rules($database, $input); |
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|
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=cut |
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|
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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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|
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=head2 normalize_rules |
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|
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my $source = $parser->normalize_rules($database, $input); |
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|
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=cut |
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|
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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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|
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|
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=head2 have_rules |
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|
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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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|
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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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|
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=cut |
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|
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sub have_rules { |
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my $self = shift; |
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|
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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 $input = shift @_; |
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|
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$input = _input_name($input); |
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|
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|
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return unless defined( $self->{_have_rules}->{ _q($database) } ); |
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|
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my $database_rules = $self->{_have_rules}->{ _q($database ) }; |
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|
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if (defined($input)) { |
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|
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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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|
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return $database_rules->{ _q($input) }->{ $type }; |
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} |
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|
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my $usage; |
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|
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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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|
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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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|
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return $usage; |
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|
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} |
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|
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|
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=head1 PRIVATE |
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|
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=head2 _read_sources |
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|
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my $source_files = $parser->_read_sources; |
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|
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Called by L</new>. |
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|
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=cut |
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|
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sub _read_sources { |
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my $self = shift; |
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|
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my $log = $self->_get_logger(); |
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|
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my $nr = 0; |
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|
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my @sources; |
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|
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$self->{config}->iterate_inputs( sub { |
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my ($input, $database) = @_; |
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|
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$log->debug("database: $database input = ", dump($input)); |
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|
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foreach my $normalize (@{ $input->{normalize} }) { |
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|
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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 : $path; |
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|
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$log->logdie("normalization input $full doesn't exist") unless (-e $full); |
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|
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my $s = read_file( $full ) || $log->logdie("can't read $full: $!"); |
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|
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my $input_name = _input_name($input) || $log->logdie("can't deduce name of input: ", dump( $input )); |
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|
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$log->debug("$database/$input_name: adding $path"); |
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|
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$self->{valid_inputs}->{$database}->{$input_name}++; |
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|
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push @sources, sub { |
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$self->_parse_source( $database, $input_name, $full, $s ); |
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}; |
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|
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$nr++; |
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} |
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} ); |
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|
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$log->debug("found $nr source files"); |
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|
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# parse all sources |
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$_->() foreach (@sources); |
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|
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return $nr; |
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} |
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|
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=head2 _parse_source |
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|
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$parser->_parse_source($database,$input,$path,$source); |
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|
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Called for each normalize source (rules) in each input by L</_read_sources> |
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|
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It will report invalid databases and inputs in error log after parsing. |
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|
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=cut |
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|
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sub _parse_source { |
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my $self = shift; |
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my ($database, $input, $path, $source) = @_; |
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|
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$input = _input_name($input); |
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|
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my $log = $self->_get_logger(); |
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|
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$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, $input ); |
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|
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$log->logdie("no source found for database $database input $input path $path") unless ($source); |
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|
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$log->info("parsing lookups for $database/$input from $path (",length($source)," bytes)"); |
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|
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my $Document = PPI::Document->new( \$source ) || $log->logdie("can't parse source:\n", $self->{source}); |
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|
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$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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|
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# Find all the named subroutines |
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|
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$self->{_lookup_errors} = (); |
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|
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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} }, $msg; |
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return ''; |
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} |
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|
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$Document->find( sub { |
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my ($Document,$Element) = @_; |
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|
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$Element->isa('PPI::Token::Word') or return ''; |
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$Element->content eq 'lookup' or return ''; |
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|
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$log->debug("expansion: ", $Element->snext_sibling); |
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|
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my $args = $Element->snext_sibling; |
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|
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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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|
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if ($log->is_debug) { |
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my $report = "found " . scalar @e . " elements:\n"; |
| 336 |
|
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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 ); |
| 339 |
} |
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|
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$log->debug($report); |
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} |
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|
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my $key_element = $e[8]->clone; |
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|
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$log->logdie("key element must be PPI::Structure::Block") unless $key_element->isa('PPI::Structure::Block'); |
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|
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$log->debug("key part: ", $key_element); |
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|
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my @key; |
| 351 |
|
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$key_element->find( sub { |
| 353 |
my $e = $_[1] || die "no element?"; |
| 354 |
$e->isa('PPI::Token::Word') or return ''; |
| 355 |
$e->content eq 'rec' or return ''; |
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|
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my $kf = $e->snext_sibling; |
| 358 |
|
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$log->debug("key fragment = $kf"); |
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|
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push @key, eval $kf; |
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$log->logdie("can't eval { $kf }: $@") if ($@); |
| 363 |
|
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return 1; |
| 365 |
}); |
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|
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my $key = join('-', @key ) || $log->logdie("no key found!"); |
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|
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$log->debug("key = $key"); |
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|
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return $self->_lookup_error("invalid database $e[3] in $path" ) unless $self->valid_database( $e[3] ); |
| 372 |
return $self->_lookup_error("invalid input $e[5] of database $e[3] in $path", ) unless $self->valid_database_input( $e[3], $e[5] ); |
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|
| 374 |
my $create = qq{ |
| 375 |
save_into_lookup($e[3],$e[5],'$key', $e[7] $e[8] ); |
| 376 |
}; |
| 377 |
|
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$log->debug("create: $create"); |
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|
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# save code to create this lookup |
| 381 |
$self->{_lookup_create}->{ _q($e[3]) }->{ _q($e[5]) } .= $create; |
| 382 |
$self->{_lookup_create_key}->{ _q($e[3]) }->{ _q($e[5]) }->{ _q($key) }++; |
| 383 |
|
| 384 |
|
| 385 |
if (defined( $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{ $key } )) { |
| 386 |
$log->warn("dependency of $database/$input on $e[3]/$e[5] with $key allready recorded"); |
| 387 |
} |
| 388 |
|
| 389 |
# save this dependency |
| 390 |
$self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{$key}++; |
| 391 |
|
| 392 |
if ($#e < 10) { |
| 393 |
$e[8]->insert_after( $e[8]->clone ); |
| 394 |
$e[8]->insert_after( $e[7]->clone ); |
| 395 |
$e[8]->insert_after( $e[6]->clone ); |
| 396 |
} |
| 397 |
|
| 398 |
$e[7]->remove; |
| 399 |
$e[8]->insert_before( new PPI::Token::Quote::Single( "'$key'" ) ); |
| 400 |
$e[8]->remove; |
| 401 |
|
| 402 |
|
| 403 |
$log->debug(">>> ", $Element->snext_sibling); |
| 404 |
}); |
| 405 |
|
| 406 |
my $normalize_source = $Document->serialize; |
| 407 |
$log->debug("create: ", dump($self->{_lookup_create}) ); |
| 408 |
$log->debug("normalize: $normalize_source"); |
| 409 |
|
| 410 |
$self->{_normalize_source}->{$database}->{$input} .= $normalize_source; |
| 411 |
|
| 412 |
if ($self->{debug}) { |
| 413 |
my $Dumper = PPI::Dumper->new( $Document ); |
| 414 |
$Dumper->print; |
| 415 |
} |
| 416 |
|
| 417 |
$log->error("Parser errors:\n", join("\n",@{ $self->{_lookup_errors} }) ) if ($self->{_lookup_errors}); |
| 418 |
|
| 419 |
$Document->find( sub { |
| 420 |
my ($Document,$Element) = @_; |
| 421 |
|
| 422 |
$Element->isa('PPI::Token::Word') or return ''; |
| 423 |
if ($Element->content =~ m/^(marc|search)/) { |
| 424 |
my $what = $1; |
| 425 |
$log->debug("found $what rules in $database/$input"); |
| 426 |
$self->{_have_rules}->{ $database }->{ $input }->{ $what }->{ $Element->content }++; |
| 427 |
} else { |
| 428 |
return ''; |
| 429 |
} |
| 430 |
}); |
| 431 |
|
| 432 |
return 1; |
| 433 |
} |
| 434 |
|
| 435 |
|
| 436 |
=head2 _q |
| 437 |
|
| 438 |
Strip single or double quotes around value |
| 439 |
|
| 440 |
_q(qq/'foo'/) -> foo |
| 441 |
|
| 442 |
=cut |
| 443 |
|
| 444 |
sub _q { |
| 445 |
my $v = shift || return; |
| 446 |
$v =~ s/^['"]*//g; |
| 447 |
$v =~ s/['"]*$//g; |
| 448 |
return $v; |
| 449 |
} |
| 450 |
|
| 451 |
=head2 _input_name |
| 452 |
|
| 453 |
Return C<name> value if HASH or arg if scalar |
| 454 |
|
| 455 |
_input_name($input) |
| 456 |
|
| 457 |
=cut |
| 458 |
|
| 459 |
sub _input_name { |
| 460 |
my $input = shift || return; |
| 461 |
if (ref($input) eq 'HASH') { |
| 462 |
die "can't find 'name' value in ", dump($input) unless defined($input->{name}); |
| 463 |
return $input->{name}; |
| 464 |
} else { |
| 465 |
return $input; |
| 466 |
} |
| 467 |
} |
| 468 |
|
| 469 |
|
| 470 |
=head1 AUTHOR |
| 471 |
|
| 472 |
Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
| 473 |
|
| 474 |
=head1 COPYRIGHT & LICENSE |
| 475 |
|
| 476 |
Copyright 2006 Dobrica Pavlinusic, All Rights Reserved. |
| 477 |
|
| 478 |
This program is free software; you can redistribute it and/or modify it |
| 479 |
under the same terms as Perl itself. |
| 480 |
|
| 481 |
=cut |
| 482 |
|
| 483 |
1; # End of WebPAC::Parser |
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