git.rot13.org Git - webpac2/blob - lib/WebPAC/Parser.pm

   1 package WebPAC::Parser;
   2
   3 use warnings;
   4 use strict;
   5
   6 use base qw/WebPAC::Common WebPAC::Normalize/;
   7
   8 use PPI;
   9 use PPI::Dumper;
  10 use Data::Dump qw/dump/;
  11 use File::Slurp;
  12
  13
  14 =head1 NAME
  15
  16 WebPAC::Parser - parse perl normalization configuration files and mungle it
  17
  18 =head1 VERSION
  19
  20 Version 0.01
  21
  22 =cut
  23
  24 our $VERSION = '0.01';
  25
  26 =head1 SYNOPSIS
  27
  28 FIXME
  29
  30 =head1 FUNCTIONS
  31
  32 =head2 new
  33
  34 Create new parser object.
  35
  36   my $parser = new WebPAC::Parser(
  37         config => new WebPAC::Config(),
  38         base_path => '/optional/path/to/conf',
  39   );
  40
  41 =cut
  42
  43 sub new {
  44         my $class = shift;
  45         my $self = {@_};
  46         bless($self, $class);
  47
  48         my $log = $self->_get_logger();
  49
  50         $log->logdie("config isn't WebPAC::Config") unless ($self->{config} && $self->{config}->isa('WebPAC::Config'));
  51
  52         $log->logdie("can't iterate_inputs over this config object") unless ($self->{config}->can('iterate_inputs'));
  53
  54         my $source;
  55
  56         $self->{config}->iterate_inputs( sub {
  57                 my $input = shift;
  58                 my $path = $input->{normalize}->{path} || return;
  59                 my $full = $self->{base_path} ? $self->{base_path} . '/' . $path : $path;
  60                 $log->logdie("normalization input $full doesn't exist") unless (-e $full);
  61                 my $s = read_file( $full ) || $log->logdie("can't read $full: $!");
  62                 $log->debug("adding $path to parser [",length($s)," bytes]");
  63                 $source .= $s;
  64         } );
  65
  66         $log->debug("collected ", length($source), " bytes of source");
  67
  68         $self->{source} = $source;
  69
  70         $self ? return $self : return undef;
  71 }
  72
  73 =head2 parse
  74
  75 =cut
  76
  77 sub parse {
  78         my $self = shift;
  79
  80         my $log = $self->_get_logger();
  81
  82         $log->logdie('no source found in object') unless ($self->{source});
  83
  84         my $Document = PPI::Document->new( \$self->{source} ) || $log->logdie("can't parse source:\n", $self->{source});
  85
  86         $Document->prune('PPI::Token::Whitespace');
  87         #$Document->prune('PPI::Token::Operator');
  88
  89         # Find all the named subroutines
  90
  91         my $eval_create;
  92
  93         $Document->find( sub {
  94                         my ($Document,$Element) = @_;
  95
  96                         $Element->isa('PPI::Token::Word') or return '';
  97                         $Element->content eq 'lookup' or return '';
  98
  99                         print "#*** expansion: ", $Element->snext_sibling,$/;
 100
 101                         my $args = $Element->snext_sibling;
 102
 103                         my @e = $args->child(0)->elements;
 104                         print "hum, expect at least 8 elements, got ", scalar @e, " in $args\n" if ($#e < 8);
 105
 106                         print "# found ", scalar @e, " elements:\n";
 107
 108                         foreach my $i ( 0 .. $#e ) {
 109                                 printf("# %-2d: %-30s %s\n", $i, ( $e[$i] || 'undef' ), $e[$i]->class );
 110                         }
 111
 112                         my $key_element = $e[8]->clone;
 113
 114                         die "key element must be PPI::Structure::Block" unless $key_element->isa('PPI::Structure::Block');
 115
 116                         print "## key part: ", $key_element, $/;
 117
 118                         my @key;
 119
 120                         $key_element->find( sub {
 121                                 my $e = $_[1] || die "no element?";
 122                                 $e->isa('PPI::Token::Word') or return '';
 123                                 $e->content eq 'rec' or return '';
 124
 125                                 my $kf = $e->snext_sibling;
 126
 127                                 print "## key fragment = $kf\n";
 128
 129                                 push @key, eval $kf;
 130                                 print "ERROR: can't eval { $kf }: $@" if ($@);
 131
 132                                 return 1;
 133                         });
 134
 135                         my $key = join('-', @key ) || print "ERROR: no key found!";
 136
 137                         print "key = $key\n";
 138
 139                         my $create = '
 140                                 $coderef = ' . $e[7] . $e[8] . ';
 141                                 foreach my $v ($coderef->()) {
 142                                         next unless (defined($v) && $v ne \'\');
 143                                         push @{ $lookup->{\'' . $key . '\'}->{$v} }, $mfn;
 144                                 }
 145                         ';
 146
 147                         print "create: $create\n";
 148
 149                         $create =~ s/\s+/ /gs;
 150                         $eval_create->{ $e[3] }->{ $e[5] } .= $create;
 151
 152                         if ($#e < 10) {
 153                                 $e[8]->insert_after( $e[8]->clone );
 154                                 $e[8]->insert_after( $e[7]->clone );
 155                                 $e[8]->insert_after( $e[6]->clone );
 156                         }
 157
 158                         $e[7]->remove;
 159                         $e[8]->insert_before( new PPI::Token::Quote::Single( "'$key'" ) );
 160                         $e[8]->remove;
 161
 162
 163                         print "# >>> ", $Element->snext_sibling, "\n";
 164         });
 165
 166         print "-----\ncreate: ", dump($eval_create), "\n";
 167         print "-----\nlookup: ", $Document->serialize, "\n";
 168         print "-----\n";
 169
 170         my $Dumper = PPI::Dumper->new( $Document );
 171         $Dumper->print;
 172
 173 }
 174
 175 =head1 AUTHOR
 176
 177 Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
 178
 179 =head1 COPYRIGHT & LICENSE
 180
 181 Copyright 2006 Dobrica Pavlinusic, All Rights Reserved.
 182
 183 This program is free software; you can redistribute it and/or modify it
 184 under the same terms as Perl itself.
 185
 186 =cut
 187
 188 1; # End of WebPAC::Parser