/v1/mod_semanticweb/arc/extractors/ARC2_RDFExtractor.php
PHP | 249 lines | 191 code | 37 blank | 21 comment | 36 complexity | 710bbfe80b94e7c984720285bd3ea66d MD5 | raw file
- <?php
- /*
- homepage: http://arc.semsol.org/
- license: http://arc.semsol.org/license
-
- class: ARC2 RDF Extractor
- author: Benjamin Nowack
- version: 2008-11-18 (Fix: Skip comments. Thanks to Masahide Kanzaki)
- */
-
- ARC2::inc('Class');
-
- class ARC2_RDFExtractor extends ARC2_Class {
-
- function __construct($a = '', &$caller) {
- parent::__construct($a, $caller);
- }
-
- function ARC2_RDFExtractor($a = '', &$caller) {
- $this->__construct($a, $caller);
- }
-
- function __init() {
- parent::__init();
- $this->nodes = $this->caller->getNodes();
- $this->index = $this->caller->getNodeIndex();
- $this->bnode_prefix = $this->v('bnode_prefix', 'arc' . substr(md5(uniqid(rand())), 0, 4) . 'b', $this->a);
- $this->bnode_id = 0;
- $this->keep_cdata_ws = $this->v('keep_cdata_whitespace', 0, $this->a);
- if (!isset($this->a['ns'])) $this->a['ns'] = array('rdf' => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#');
- }
-
- /* */
-
- function x($re, $v, $options = 'si') {
- return ARC2::x($re, $v, $options);
- }
-
- function camelCase($v) {
- $r = ucfirst($v);
- while (preg_match('/^(.*)[\-\_ ](.*)$/', $r, $m)) {
- $r = $m[1] . ucfirst($m[2]);
- }
- return $r;
- }
-
- function createBnodeID(){
- $this->bnode_id++;
- return '_:' . $this->bnode_prefix . $this->bnode_id;
- }
-
- /* */
-
- function extractRDF() {
- }
-
- /* */
-
- function addTs($ts) {
- foreach ($ts as $t) {
- $this->caller->addT($t);
- }
- }
-
- function addT($t) {
- return $this->caller->addT($t);
- }
-
- /* */
-
- function getSubNodes($n) {
- return $this->v($n['id'], array(), $this->index);
- }
-
- function getParentNode($n) {
- return isset($this->nodes[$n['p_id']]) ? $this->nodes[$n['p_id']] : 0;
- }
-
- /* */
-
- function getSubNodesByClass($n, $cls, $skip_self = 0) {
- if (!$skip_self && $this->hasClass($n, $cls)) {
- return array($n);
- }
- $r = array();
- $sns = $this->getSubNodes($n);
- foreach ($sns as $sn) {
- if ($sub_r = $this->getSubNodesByClass($sn, $cls, 0)) {
- $r = array_merge($r, $sub_r);
- }
- }
- return $r;
- }
-
- function getSubNodeByClass($n, $cls, $skip_self = 0) {
- if (!$skip_self && $this->hasClass($n, $cls)) {
- return $n;
- }
- $sns = $this->getSubNodes($n);
- foreach ($sns as $sn) {
- if ($sub_r = $this->getSubNodeByClass($sn, $cls, 0)) {
- return $sub_r;
- }
- }
- return 0;
- }
-
- function getParentNodeByClass($n, $cls, $skip_self = 0) {
- if (!$skip_self && $this->hasClass($n, $cls)) {
- return $n;
- }
- if ($pn = $this->getParentNode($n)) {
- if ($sub_r = $this->getParentNodeByClass($pn, $cls, 0)) {
- return $sub_r;
- }
- }
- return 0;
- }
-
- /* */
-
- function hasAttribute($a, $n, $v) {
- $vs = is_array($v) ? $v : array($v);
- $a_vs = $this->v($a . ' m', array(), $n['a']);
- return array_intersect($vs, $a_vs) ? 1 : 0;
- }
-
- function hasClass($n, $v) {
- return $this->hasAttribute('class', $n, $v);
- }
-
- function hasRel($n, $v) {
- return $this->hasAttribute('rel', $n, $v);
- }
-
- /* */
-
- function getDocBase() {
- $root_node = $this->getRootNode();
- $r = $root_node['doc_base'];
- foreach ($this->getSubNodes($root_node) as $root_child) {
- if ($root_child['tag'] == 'head') {
- foreach ($this->getSubNodes($root_child) as $head_child) {
- if ($head_child['tag'] == 'base') {
- $r = $head_child['a']['href'];
- break;
- }
- }
- }
- }
- return $r;
- }
-
- /* */
-
- function getPlainContent($n, $trim = 1) {
- if ($n['tag'] == 'comment') {
- $r = '';
- }
- elseif ($n['tag'] == 'cdata') {
- $r = $n['a']['value'];
- }
- elseif (trim($this->v('cdata', '', $n))) {
- $r = $n['cdata'];
- $sub_nodes = $this->getSubNodes($n);
- foreach ($sub_nodes as $sub_n) {
- $r .= $this->getPlainContent($sub_n, 0);
- }
- }
- elseif (($n['tag'] == 'img') && isset($n['a']['alt'])) {
- $r = $n['a']['alt'];
- }
- else {
- $r = '';
- $sub_nodes = $this->getSubNodes($n);
- foreach ($sub_nodes as $sub_n) {
- $r .= $this->getPlainContent($sub_n, 0);
- }
- }
- $r = preg_replace('/\s/s', ' ', $r);
- $r = preg_replace('/\s\s*/s', ' ', $r);
- return $trim ? trim($r) : $r;
- }
-
- function getContent($n, $outer = 0, $trim = 1) {
- //echo '<pre>' . htmlspecialchars(print_r($n, 1)) . '</pre>';
- if ($n['tag'] == 'comment') {
- $r = '<!-- ' . $n['a']['value'] . ' -->';
- }
- elseif ($n['tag'] == 'cdata') {
- $r = $n['a']['value'];
- }
- else {
- $r = '';
- if ($outer) {
- $r .= '<' . $n['tag'];
- asort($n['a']);
- if (isset($n['a']['xmlns']) && $n['a']['xmlns']['']) {
- $r .= ' xmlns="' . $n['a']['xmlns'][''] . '"';
- }
- foreach ($n['a'] as $a => $val) {
- if (!is_array($val) && isset($n['a'][$a . ' uri'])) $val = $n['a'][$a . ' uri'];
- $r .= preg_match('/^[^\s]+$/', $a) && !is_array($val) ? ' ' . $a . '="' . addslashes($val) . '"' : '';
- }
- $r .= $n['empty'] ? '/>' : '>';
- }
- if (!$n['empty']) {
- $r .= $this->v('cdata', '', $n);
- $sub_nodes = $this->getSubNodes($n);
- foreach ($sub_nodes as $sub_n) {
- $r .= $this->getContent($sub_n, 1, 0);
- }
- if ($outer) {
- $r .= '</' . $n['tag'] . '>';
- }
- }
- }
- return ($trim && !$this->keep_cdata_ws) ? trim($r) : $r;
- }
-
- /* */
-
- function getDocID($n) {
- $id = $n['id'];
- $k = 'doc_' . $id;
- if (!isset($this->caller->cache[$k])) {
- $this->caller->cache[$k] = $n['doc_url'];
- }
- return $this->caller->cache[$k];
- }
-
- function getDocOwnerID($n) {
- return '_:owner_of_' . $this->normalize($this->getDocID($n));
- }
-
- /* */
-
- function normalize($v) {
- $v = preg_replace('/[\W\s]+/is', '_', strip_tags(strtolower($v)));
- $v = preg_replace('/http/', '', $v);
- $v = preg_replace('/[\_]+/', '_', $v);
- //$v = substr($v, 0, 30);
- $v = trim($v, '_');
- return $v;
- }
-
- /* */
-
- }