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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 WebPAC::Normalize/; |
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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 and mungle it |
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|
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=head1 VERSION |
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|
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Version 0.04 |
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|
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=cut |
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|
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our $VERSION = '0.04'; |
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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 |
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to produce lookups and normalization. |
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|
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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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|
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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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|
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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 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 $nr = 0; |
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|
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my @lookups; |
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|
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$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 @lookups, sub { |
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$self->parse_lookups( $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 $nr source files"); |
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|
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# parse all lookups |
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$_->() foreach (@lookups); |
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|
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return $nr; |
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} |
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|
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=head2 parse_lookups |
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|
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$parser->parse_lookups($database,$input,$path,$source); |
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|
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Called for each normalize source in each input by L</new> |
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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_lookups { |
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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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#$Document->prune('PPI::Token::Operator'); |
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|
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# Find all the named subroutines |
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|
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$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"; |
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|
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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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|
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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: ", $key_element); |
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my @key; |
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|
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$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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|
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my $kf = $e->snext_sibling; |
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|
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$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 }: $@") if ($@); |
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|
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return 1; |
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}); |
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my $key = join('-', @key ) || $log->logdie("no key found!"); |
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$log->debug("key = $key"); |
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|
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my $create = ' |
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$coderef = ' . $e[7] . $e[8] . '; |
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foreach my $v ($coderef->()) { |
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next unless (defined($v) && $v ne \'\'); |
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push @{ $lookup->{\'' . $key . '\'}->{$v} }, $mfn; |
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} |
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'; |
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|
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$log->debug("create: $create"); |
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|
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return $self->_lookup_error("invalid database $e[3] in $path" ) unless $self->valid_database( $e[3] ); |
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return $self->_lookup_error("invalid input $e[5] of database $e[3] in $path", ) unless $self->valid_database_input( $e[3], $e[5] ); |
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# save code to create this lookup |
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$self->{_lookup_create}->{ _q($e[3]) }->{ _q($e[5]) }->{ _q($key) } .= $create; |
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|
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|
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if (defined( $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) } )) { |
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my $dep_key = $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }; |
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$log->warn("dependency of $database/$input on $e[3]/$e[5] allready recorded as $dep_key, now changed to $key") if ($dep_key ne $key); |
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} |
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|
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# save this dependency |
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$self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) } .= $key; |
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|
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if ($#e < 10) { |
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$e[8]->insert_after( $e[8]->clone ); |
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$e[8]->insert_after( $e[7]->clone ); |
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$e[8]->insert_after( $e[6]->clone ); |
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} |
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|
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$e[7]->remove; |
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$e[8]->insert_before( new PPI::Token::Quote::Single( "'$key'" ) ); |
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$e[8]->remove; |
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|
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|
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$log->debug(">>> ", $Element->snext_sibling); |
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}); |
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|
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my $normalize_source = $Document->serialize; |
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$log->debug("create: ", dump($self->{_lookup_create}) ); |
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$log->debug("normalize: $normalize_source"); |
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|
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$self->{_normalize_source}->{$database}->{$input} = $normalize_source; |
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|
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if ($self->{debug}) { |
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my $Dumper = PPI::Dumper->new( $Document ); |
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$Dumper->print; |
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} |
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|
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$log->error("Parser errors:\n", join("\n",@{ $self->{_lookup_errors} }) ) if ($self->{_lookup_errors}); |
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|
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return 1; |
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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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return $self->{_lookup_create}->{ _q($database) }->{ _q($input) }; |
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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 $self = shift; |
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|
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my ($database,$input) = @_; |
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return defined($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,$input) = @_; |
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$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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=head1 PRIVATE |
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|
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=head2 _q |
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|
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Strip single or double quotes around value |
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|
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_q(qq/'foo'/) -> foo |
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|
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=cut |
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|
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sub _q { |
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my $v = shift || return; |
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$v =~ s/^['"]*//g; |
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$v =~ s/['"]*$//g; |
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return $v; |
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} |
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|
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=head2 _input_name |
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|
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Return C<name> value if HASH or arg if scalar |
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|
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_input_name($input) |
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|
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=cut |
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|
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sub _input_name { |
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my $input = shift || return; |
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if (ref($input) eq 'HASH') { |
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die "can't find 'name' value in ", dump($input) unless defined($input->{name}); |
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return $input->{name}; |
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} else { |
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return $input; |
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} |
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} |
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|
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|
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=head1 AUTHOR |
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|
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Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
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|
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=head1 COPYRIGHT & LICENSE |
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|
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Copyright 2006 Dobrica Pavlinusic, All Rights Reserved. |
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|
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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|
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=cut |
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|
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1; # End of WebPAC::Parser |
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