| 1 | <?php
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| 2 |
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| 3 | // ----------------------------------------------------------------------------------
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| 4 | // Class: N3Serializer
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| 5 | // ----------------------------------------------------------------------------------
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| 6 |
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| 7 | /**
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| 8 | * PHP Notation3 Serializer
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| 9 | *
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| 10 | * This class serialises models to N3 Syntax.
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| 11 | *
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| 12 | * Supported N3 features:
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| 13 | * <ul>
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| 14 | * <li>Using [ ] for blank nodes, or _: if necessary</li>
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| 15 | * <li>Literal datatype- and xmlLanguageTag support</li>
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| 16 | * </ul>
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| 17 | *
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| 18 | * Un-supported N3 Features include:
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| 19 | * <ul>
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| 20 | * <li>Reification</li>
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| 21 | * </ul>
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| 22 | *
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| 23 | *
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| 24 | * @author Gunnar AA. Grimnes <ggrimnes@csd.abdn.ac.uk>
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| 25 | * @author Daniel Westphal <mail@d-westphal.de>
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| 26 | * @author Christian Weiske <cweiske@cweiske.de>
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| 27 | * @version $Id: N3Serializer.php 556 2008-01-22 10:52:48Z fusel2k $
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| 28 | * @package syntax
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| 29 | * @access public
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| 30 | **/
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| 31 |
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| 32 | define('MAGIC_STRING', '~~~');
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| 33 |
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| 34 | class N3Serializer extends Object
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| 35 | {
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| 36 |
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| 37 | var $debug = false;
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| 38 |
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| 39 | var $prefixes = array();
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| 40 | var $noPrefixes = array();
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| 41 |
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| 42 | var $done; // keeps track of already serialized resources
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| 43 | var $resourcetext;
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| 44 | var $resourcetext_taken;
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| 45 | var $model;
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| 46 | var $res;
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| 47 | var $anon;
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| 48 |
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| 49 | var $styleCompress = false;
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| 50 | var $stylePretty = false;
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| 51 | var $styleNest = false;
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| 52 |
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| 53 | /**
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| 54 | * Constructor
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| 55 | *
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| 56 | * @access public
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| 57 | */
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| 58 | function N3Serializer()
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| 59 | {
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| 60 | $this->debug = false;
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| 61 | }
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| 62 |
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| 63 |
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| 64 | /**
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| 65 | * Adds a new namespace prefix to use.
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| 66 | * Unknown namespaces will become ns0, ns1 etc.
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| 67 | * @access public
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| 68 | * @param string $s
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| 69 | * @returns void
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| 70 | **/
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| 71 | function addNSPrefix($ns, $prefix)
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| 72 | {
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| 73 | $this->prefixes[$ns] = $prefix;
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| 74 | }
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| 75 |
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| 76 |
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| 77 |
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| 78 | /**
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| 79 | * Clears all previously set namespace prefixes
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| 80 | */
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| 81 | function clearNSPrefixes()
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| 82 | {
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| 83 | $this->prefixes = array();
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| 84 | }
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| 85 |
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| 86 |
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| 87 |
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| 88 | /**
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| 89 | * Add a namespace that shall not get shortened by using a prefix.
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| 90 | *
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| 91 | * @param string $ns Namespace URI like "http://example.com/"
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| 92 | */
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| 93 | function addNoNSPrefix($ns)
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| 94 | {
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| 95 | $this->noPrefixes[$ns] = true;
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| 96 | }
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| 97 |
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| 98 |
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| 99 |
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| 100 | /**
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| 101 | * Clears all previously set noNamespace prefixes
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| 102 | */
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| 103 | function clearNoNSPrefixes()
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| 104 | {
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| 105 | $this->noPrefixes = array();
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| 106 | }
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| 107 |
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| 108 |
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| 109 |
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| 110 | /**
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| 111 | * Serializes a model to N3 syntax.
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| 112 | *
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| 113 | * @param object Model $model
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| 114 | * @return string
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| 115 | * @access public
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| 116 | */
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| 117 | function &serialize(&$m)
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| 118 | {
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| 119 | if (is_a($m, 'DbModel')) {
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| 120 | $m=$m->getMemModel();
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| 121 | }
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| 122 |
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| 123 | $this->reset();
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| 124 | $this->model = $m;
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| 125 | $this->res = "";
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| 126 |
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| 127 | // copy default namespaces
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| 128 | global $default_prefixes;
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| 129 | foreach($default_prefixes as $prefix => $namespace) {
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| 130 | $this->addNSPrefix($namespace,$prefix);
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| 131 | }
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| 132 |
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| 133 | $nps= $this->model->getParsedNamespaces();
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| 134 | if ($nps!=false) {
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| 135 | foreach ($nps as $uri => $prefix){
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| 136 | $this->addNSPrefix($uri,$prefix);
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| 137 | }
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| 138 | }
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| 139 |
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| 140 | $namespaces = array();
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| 141 | $count = array();
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| 142 | $resources = array();
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| 143 | foreach ($this->model->triples as $t) {
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| 144 | $s = $t->getSubject();
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| 145 | if (is_a($s, 'Resource')) {
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| 146 | $namespaces[$s->getNamespace()] = 1;
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| 147 | }
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| 148 | $p = $t->getPredicate();
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| 149 | if (is_a($p, 'Resource')) {
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| 150 | $namespaces[$p->getNamespace()] = 1;
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| 151 | }
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| 152 | $o = $t->getObject();
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| 153 | if (is_a($o, 'Resource')) {
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| 154 | $namespaces[$o->getNamespace()] = 1;
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| 155 | }
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| 156 | $uri = $s->getURI();
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| 157 |
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| 158 | if (isset($count[$uri])) {
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| 159 | $count[$uri]++;
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| 160 | } else {
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| 161 | $count[$uri] = 0;
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| 162 | $resources[$uri] = $s;
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| 163 | }
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| 164 |
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| 165 | if ($this->styleNest && is_a($s, 'BlankNode')) {
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| 166 | //make sure blank nodes are sorted *after* normal nodes
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| 167 | //so that they can be included
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| 168 | $count[$uri] -= 0.00001;
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | if (!HIDE_ADVERTISE) {
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| 173 | $this->res .= '# Generated by N3Serializer.php from RDF RAP.'.LINEFEED
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| 174 | .'# http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/index.html'
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| 175 | .LINEFEED.LINEFEED;
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| 176 | }
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| 177 |
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| 178 | $this->doNamespaces($namespaces);
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| 179 |
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| 180 | $this->res .= LINEFEED.LINEFEED;
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| 181 |
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| 182 | arsort($count);
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| 183 |
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| 184 | foreach ( $count as $k => $v) {
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| 185 | $this->doResource($resources[$k]);
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| 186 | // $this->res.=" .\n";
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| 187 | }
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| 188 |
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| 189 | //make all replacements
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| 190 | do {
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| 191 | $bReplacements = false;
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| 192 | foreach ($this->resourcetext as $r => $t) {
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| 193 | if (preg_match_all('/'.MAGIC_STRING.'([^ ]+)'.MAGIC_STRING.'/', $t, $ms, PREG_SET_ORDER)) {
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| 194 | foreach ($ms as $mseach) {
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| 195 | $rp = $this->resourcetext[$mseach[1]];
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| 196 | $this->resourcetext[$r] = preg_replace('/'.MAGIC_STRING.$mseach[1].MAGIC_STRING.'/', $rp, $t);
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| 197 | $bReplacements = true;
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| 198 | }
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| 199 | }
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| 200 |
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| 201 | }
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| 202 | } while ($bReplacements);
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| 203 |
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| 204 | //after all replacements took place, put the lines out
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| 205 | $c = 0;
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| 206 | foreach ($this->resourcetext as $r => $t) {
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| 207 | if ($this->debug) {
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| 208 | $this->res .= $c . ': ';
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| 209 | }
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| 210 | if (!(isset($this->resourcetext_taken[$r]) && $this->resourcetext_taken[$r]>0)) {
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| 211 | $this->res .= $t . ' .' . LINEFEED;
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| 212 | if ($this->stylePretty) {
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| 213 | $this->res .= LINEFEED;
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| 214 | }
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| 215 | } else if ($this->debug ) {
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| 216 | $this->res.=' Skipping : '.$t.LINEFEED;
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| 217 | }
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| 218 | $c++;
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| 219 | }
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| 220 |
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| 221 | // $max=-1111;
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| 222 | // $maxkey="";
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| 223 | // foreach ($count as $k=>$c) {
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| 224 | // if ( $c>$max) { $maxkey=$k; $max=$c; }
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| 225 | // }
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| 226 |
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| 227 | // if ($this->debug) {
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| 228 | // print "$maxkey is subject of most triples! ($max) \n";
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| 229 | // }
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| 230 |
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| 231 | return $this->res;
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| 232 | }//function &serialize(&$m)
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| 233 |
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| 234 |
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| 235 |
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| 236 | /**
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| 237 | * Serializes a model and saves it into a file.
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| 238 | * Returns FALSE if the model couldn't be saved to the file.
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| 239 | *
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| 240 | * @param object MemModel $model
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| 241 | * @param string $filename
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| 242 | * @return boolean
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| 243 | * @access public
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| 244 | */
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| 245 | function saveAs(&$model, $filename)
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| 246 | {
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| 247 | // serialize model
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| 248 | $n3 = $this->serialize($model);
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| 249 |
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| 250 | // write serialized model to file
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| 251 | $file_handle = @fopen($filename, 'w');
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| 252 | if ($file_handle) {
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| 253 | fwrite($file_handle, $n3);
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| 254 | fclose($file_handle);
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| 255 | return true;
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| 256 | } else {
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| 257 | return false;
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| 258 | };
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| 259 | }
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| 260 |
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| 261 |
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| 262 |
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| 263 | /**
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| 264 | * Set to true, if the N3 serializer should try to compress the blank node
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| 265 | * syntax using [] whereever possible.
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| 266 | */
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| 267 | function setCompress($compress)
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| 268 | {
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| 269 | $this->styleCompress = $compress;
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| 270 | }
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| 271 |
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| 272 |
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| 273 |
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| 274 | /**
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| 275 | * Enables pretty printing in semicolon delimited sentences.
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| 276 | */
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| 277 | function setPrettyPrint($prettyPrint)
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| 278 | {
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| 279 | $this->stylePretty = $prettyPrint;
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| 280 | }
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| 281 |
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| 282 |
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| 283 |
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| 284 | /**
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| 285 | * Enables nesting of blank nodes with [] if
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| 286 | * compression is activated via @see setCompress
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| 287 | */
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| 288 | function setNest($nest)
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| 289 | {
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| 290 | $this->styleNest = $nest;
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| 291 | }
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| 292 |
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| 293 | /* ==================== Private Methods from here ==================== */
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| 294 |
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| 295 |
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| 296 | /**
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| 297 | * Readies this object for serializing another model
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| 298 | * @access private
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| 299 | * @param void
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| 300 | * @returns void
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| 301 | **/
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| 302 | function reset()
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| 303 | {
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| 304 | $this->anon = 0;
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| 305 | $this->done = array();
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| 306 | $this->resourcetext_taken = array();
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| 307 | $this->resourcetext = array();
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| 308 | $this->res = '';
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| 309 | $this->model = null;
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| 310 | }
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| 311 |
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| 312 |
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| 313 |
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| 314 | /**
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| 315 | * Makes ns0, ns1 etc. prefixes for unknown prefixes.
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| 316 | * Outputs @prefix lines.
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| 317 | * @access private
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| 318 | * @param array $n
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| 319 | * @returns void
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| 320 | **/
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| 321 | function doNamespaces(&$n)
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| 322 | {
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| 323 | $c = 0;
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| 324 | foreach ($n as $ns => $nonsense) {
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| 325 | if (!$ns || isset($this->noPrefixes[$ns])) {
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| 326 | continue;
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| 327 | }
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| 328 | if (isset($this->prefixes[$ns])) {
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| 329 | $p = $this->prefixes[$ns];
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| 330 | } else {
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| 331 | $p = 'ns' . $c;
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| 332 | $this->prefixes[$ns] = $p;
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| 333 | $c++;
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| 334 | }
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| 335 | $this->res .= "@prefix $p: <".$ns.'> .'.LINEFEED;
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| 336 | }
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| 337 | }
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| 338 |
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| 339 |
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| 340 |
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| 341 | /**
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| 342 | * Fill in $resourcetext for a single resource.
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| 343 | * Will recurse into Objects of triples, but should never look ? (really?)
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| 344 | * @param object Resource $r
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| 345 | * @returns boolean
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| 346 | * @access private
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| 347 | **/
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| 348 | function doResource(&$r, $bEmbedded = false, $strIndent = ' ')
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| 349 | {
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| 350 | //var_dump($r->getURI());
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| 351 |
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| 352 | $ts = $this->model->find($r, null, null);
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| 353 | if (count($ts->triples) == 0) {
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| 354 | if ($bEmbedded) {
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| 355 | $this->resourcetext[$r->getURI()] = '_:' . $r->getLabel();
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| 356 | }
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| 357 | return;
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| 358 | }
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| 359 |
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| 360 | $out = '';
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| 361 |
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| 362 | if (isset($this->done[$r->getURI()]) && $this->done[$r->getURI()]) {
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| 363 | if (!$this->styleNest && is_a($r, 'BlankNode')) {
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| 364 | if ($this->resourcetext_taken[$r->getURI()] == 1) {
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| 365 | //Oh bother, we must use the _:blah construct.
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| 366 | $a = $this->resourcetext[$r->getURI()];
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| 367 | $this->resourcetext[$r->getURI()]='_:anon'.$this->anon;
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| 368 | $this->resourcetext['_:anon'.$this->anon]=$this->fixAnon($a, '_:anon'.$this->anon);
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| 369 | $this->resourcetext_taken[$r->getURI()]=2;
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| 370 | $this->anon++;
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| 371 | }
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| 372 | }
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| 373 | return false;
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| 374 | }
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| 375 |
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| 376 | $this->done[$r->getURI()] = true;
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| 377 | $compress = false;
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| 378 |
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| 379 | if (is_a($r, 'Resource')) {
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| 380 | if (is_a($r, 'BlankNode')) {
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| 381 | //test if this blanknode is referenced somewhere
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| 382 | $rbn = $this->model->find(null, null, $r);
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| 383 | $compress = (N3SER_BNODE_SHORT || $this->styleCompress)
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| 384 | && (
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| 385 | count($rbn->triples) == 0
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| 386 | || (count($rbn->triples) == 1 && $bEmbedded)
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| 387 | );
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| 388 | if ($compress) {
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| 389 | $out.='[';
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| 390 | } else {
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| 391 | $out.='_:'.$r->getLabel();
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| 392 | }
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| 393 | } else {
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| 394 | $this->doURI($r, $out);
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| 395 | }
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| 396 | }
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| 397 |
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| 398 | usort($ts->triples, 'statementsorter');
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| 399 | $lastp = '';
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| 400 | $out .= ' ';
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| 401 |
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| 402 | foreach ($ts->triples as $t) {
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| 403 | $p = $t->getPredicate();
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| 404 |
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| 405 | if ($p === $lastp) {
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| 406 | $out .= ' , ';
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| 407 | } else {
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| 408 | if ($lastp!='') {
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| 409 | if ($this->stylePretty) {
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| 410 | $out .= ";\n" . $strIndent;
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| 411 | } else {
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| 412 | $out .= ' ; ';
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| 413 | }
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| 414 | }
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| 415 | $this->doURI($p, $out);
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| 416 | $lastp = $p;
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| 417 | }
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| 418 |
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| 419 | $out .= ' ';
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| 420 |
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| 421 | $o = $t->getObject();
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| 422 |
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| 423 | if (is_a($o, 'Literal')) {
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| 424 | $l = $o->getLabel();
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| 425 | if (strpos($l, LINEFEED) === false) {
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| 426 | $long = false;
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| 427 | } else {
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| 428 | $long = true;
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| 429 | }
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| 430 |
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| 431 | //try to be intelligent
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| 432 | $quoteSingle = strpos($l, '\'') !== false;
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| 433 | $quoteDouble = strpos($l, '"') !== false;
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| 434 | if ($quoteSingle && !$quoteDouble) {
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| 435 | $quoteChar = $long ? '"""' : '"';
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| 436 | } else if ($quoteDouble && !$quoteSingle) {
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| 437 | $quoteChar = $long ? '\'\'\'' : '\'';
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| 438 | } else if ($quoteDouble && $quoteSingle) {
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| 439 | //both quotation chars inside
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| 440 | $quoteChar = $long ? '"""' : '"';
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| 441 | $l = addslashes($l);
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| 442 | } else {
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| 443 | //no quotation chars
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| 444 | $quoteChar = $long ? '"""' : '"';
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| 445 | }
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| 446 | $out .= $quoteChar . $l . $quoteChar;
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| 447 |
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| 448 | if ( $o->getLanguage()!='' ) {
|
|---|
| 449 | $out.='@'.$o->getLanguage();
|
|---|
| 450 | }
|
|---|
| 451 | if ( $o->getDatatype()!='' ) {
|
|---|
| 452 | $out.='^^<'.$o->getDatatype().'>';
|
|---|
| 453 | }
|
|---|
| 454 | }
|
|---|
| 455 |
|
|---|
| 456 | if (is_a($o, 'Resource')) {
|
|---|
| 457 | if ($this->debug) {
|
|---|
| 458 | print 'Doing object: '.$o->getURI().LINEFEED;
|
|---|
| 459 | }
|
|---|
| 460 | if (is_a($o, 'BlankNode')) {
|
|---|
| 461 | if ($this->styleNest && $this->styleCompress
|
|---|
| 462 | && !isset($this->done[$o->getURI()])
|
|---|
| 463 | ) {
|
|---|
| 464 | $this->doResource($o, true, $strIndent . ' ');
|
|---|
| 465 | $out .= MAGIC_STRING . $o->getURI() . MAGIC_STRING;
|
|---|
| 466 | //$out .= $this->resourcetext[$o->getURI()];
|
|---|
| 467 | $this->resourcetext_taken[$o->getURI()] = 1;
|
|---|
| 468 | } else {
|
|---|
| 469 | $out .= '_:'.$o->getLabel();
|
|---|
| 470 | }
|
|---|
| 471 | } else {
|
|---|
| 472 | $this->doURI($o, $out);
|
|---|
| 473 | }
|
|---|
| 474 | }
|
|---|
| 475 | }
|
|---|
| 476 |
|
|---|
| 477 | if ($compress) {
|
|---|
| 478 | $out .= ' ]';
|
|---|
| 479 | };
|
|---|
| 480 |
|
|---|
| 481 | $this->resourcetext[$r->getURI()]=$out;
|
|---|
| 482 |
|
|---|
| 483 | return true;
|
|---|
| 484 | }//function doResource(&$r)
|
|---|
| 485 |
|
|---|
| 486 |
|
|---|
| 487 |
|
|---|
| 488 | /**
|
|---|
| 489 | * Format a single URI
|
|---|
| 490 | * @param string $s
|
|---|
| 491 | * @return void
|
|---|
| 492 | * @access private
|
|---|
| 493 | **/
|
|---|
| 494 | function doURI(&$r, &$out)
|
|---|
| 495 | {
|
|---|
| 496 | if ($r->getURI() == 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type') {
|
|---|
| 497 | $out .= 'a';
|
|---|
| 498 | return;
|
|---|
| 499 | }
|
|---|
| 500 | $ns = $r->getNamespace();
|
|---|
| 501 | if ($ns != '' && !isset($this->noPrefixes[$ns])) {
|
|---|
| 502 | $out .= $this->prefixes[$ns].':'.$r->getLocalName();
|
|---|
| 503 | } else {
|
|---|
| 504 | //Will this ever happen? It does, now.
|
|---|
| 505 | $out .= '<' . $r->getURI() . '>';
|
|---|
| 506 | }
|
|---|
| 507 | }
|
|---|
| 508 |
|
|---|
| 509 |
|
|---|
| 510 |
|
|---|
| 511 | /**
|
|---|
| 512 | * Fix the resourcetext for a blanknode where the _: construct was used
|
|---|
| 513 | * @param string $s
|
|---|
| 514 | * @param string $a
|
|---|
| 515 | * @access private
|
|---|
| 516 | * @return void
|
|---|
| 517 | **/
|
|---|
| 518 | function fixAnon($t,$a)
|
|---|
| 519 | {
|
|---|
| 520 | $t = preg_replace("/( \] $|^\[ )/", '', $t);
|
|---|
| 521 | return $a . $t;
|
|---|
| 522 | }
|
|---|
| 523 |
|
|---|
| 524 | }
|
|---|
| 525 |
|
|---|
| 526 | ?> |
|---|
