156 lines
4.8 KiB
Perl
156 lines
4.8 KiB
Perl
# ==================================================================
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# Gossamer Threads Module Library - http://gossamer-threads.com/
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#
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# GT::RDF
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# Author : Scott Beck
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# CVS Info : 087,071,086,086,085
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# $Id: RDF.pm,v 1.2 2001/04/11 02:37:12 alex Exp $
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#
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# Copyright (c) 2000 Gossamer Threads Inc. All Rights Reserved.
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# ==================================================================
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#
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# Description: An RDF parser.
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#
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package GT::RDF;
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use GT::Base;
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use strict;
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use vars qw/$DEBUG @ISA $TAG $ERRORS/;
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@ISA = qw(GT::Base);
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$DEBUG = 0;
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$TAG = 'Topic|ExternalPage';
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$ERRORS = {};
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sub init {
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my $self = shift;
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my $opt = {};
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if (@_ == 1) {
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$self->io (shift()) or return;
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}
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else {
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if (ref $_[0] eq 'HASH') { $opt = shift }
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elsif (defined ($_[0]) and not @_ % 2) { $opt = {@_} }
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exists ($opt->{io}) or return $self->error ("BADARGS", "FATAL", 'CLASS->new (%opt) %opt must contain the key io and it must be either a file handle or a path to a file.');
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$self->io ($opt->{io});
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}
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$self->{io} || return $self->error ("BADARGS", "FATAL", 'CLASS->new (\\*FH) -or- CLASS->new (%opts). You must define in input. Either a file or a file handle');
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return $self;
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}
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sub io {
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my ($self, $io) = @_;
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if (ref $io eq 'GLOB') {
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$self->{io} = $io;
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}
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elsif (-e $io) {
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my $fh = \do { local *FH; *FH };
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open $fh, $io or return $self->error ("OPENREAD", "FATAL", $!);
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$self->{io} = $fh;
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}
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else {
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return $self->error ("BADARGS", "FATAL", '$obj->io (\*FH) -or- $obj->io ("/path/to/file")');
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}
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}
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sub parse {
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my $self = shift;
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my $io = $self->{io};
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while (1) {
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$self->{name} = '';
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$self->{attribs} = {};
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$self->{tags} = [];
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my $parse;
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if ($self->{buffer} =~ s,(<($TAG).*?</\2[^>]*?>),$parse = $1; '',oes) {
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my @tokens = grep !/^\s*$/, split /(<[^>]+?>)/, $parse;
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my $start = shift (@tokens);
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# Discard closing tag
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pop (@tokens);
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# Get the start tag and its attributes
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$start =~ /^<($TAG)\s*(.*[^\/])>$/os;
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$self->{name} = $1;
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my $attr = $2;
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if ($attr) {
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my @tmp = split (/"/, $attr);
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my $ret = {};
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my $last = '';
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for (0 .. $#tmp) {
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if (!$_ % 2) {
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$tmp[$_] =~ s/^\s+|=$//g;
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$last = $tmp[$_];
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$ret->{$last} = '';
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}
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else {
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$ret->{$last} = $tmp[$_];
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}
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}
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$self->{attribs} = $ret;
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}
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# Parse the remaining tags.
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my $last_entry;
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for (@tokens) {
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if (/^<([^\/\s]+)\s*(.*?[^\/])?>$/s) {
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my $tag = $1;
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my $attr = $2;
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my $ret = {};
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if ($attr) {
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my @tmp = split (/"/, $attr);
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my $last = '';
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for (0 .. $#tmp) {
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if (!$_ % 2) {
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$tmp[$_] =~ s/^\s+|=$//g;
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$last = $tmp[$_];
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$ret->{$last} = '';
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}
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else {
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$ret->{$last} = $tmp[$_];
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}
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}
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}
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$last_entry = { name => $tag, attribs => $ret };
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push (@{$self->{tags}}, $last_entry);
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}
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elsif (/^<([^\s\/]+)\s*(.*?)\/>$/s) {
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my $tag = $1;
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my $attr = $2;
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my $ret = {};
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if ($attr) {
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my @tmp = split (/"/, $attr);
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my $last = '';
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for (0 .. $#tmp) {
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if (!$_ % 2) {
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$tmp[$_] =~ s/^\s+|=$//g;
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$last = $tmp[$_];
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$ret->{$last} = '';
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}
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else {
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$ret->{$last} = $tmp[$_];
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}
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}
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}
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my $entry = { name => $tag, attribs => $ret };
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push (@{$self->{tags}}, $entry);
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}
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elsif (/^([^<]+)$/ and $last_entry) {
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$last_entry->{data} = $1;
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}
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}
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return $self;
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}
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# No match
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else {
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my $tmp;
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read ($io, $tmp, 3072) or last;
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$self->{buffer} .= $tmp;
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}
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}
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return;
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}
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