Thread: [Rdfapi-php-svn] SF.net SVN: rdfapi-php: [506] trunk/rdfapi-php/api/syntax/N3Serializer.php

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Revision: 506
          http://rdfapi-php.svn.sourceforge.net/rdfapi-php/?rev=506&view=rev
Author:   cweiske
Date:     2007-08-13 02:55:33 -0700 (Mon, 13 Aug 2007)

Log Message:
-----------
Don't clear namespaces when serializing - this removes
 the option to add own prefixes

Modified Paths:
--------------
    trunk/rdfapi-php/api/syntax/N3Serializer.php

Modified: trunk/rdfapi-php/api/syntax/N3Serializer.php
===================================================================

--- trunk/rdfapi-php/api/syntax/N3Serializer.php	2007-08-13 08:47:21 UTC (rev 505)
+++ trunk/rdfapi-php/api/syntax/N3Serializer.php	2007-08-13 09:55:33 UTC (rev 506)
@@ -5,25 +5,24 @@
 // ----------------------------------------------------------------------------------
 
 /**
- * PHP Notation3 Serializer 
- * 
+ * PHP Notation3 Serializer
+ *
  * This class serialises models to N3 Syntax.
- * 
- * Supported N3 features: 
+ *
+ * Supported N3 features:
  * <ul>
- *   <li>Using [ ] for blank nodes, or _: if nescessary</li>
- *   <li>Literal datytype- and xmlLanguageTag support</li> 
+ *   <li>Using [ ] for blank nodes, or _: if necessary</li>
+ *   <li>Literal datatype- and xmlLanguageTag support</li>
  * </ul>
- * 
- * Un-supported N3 Features include: 
+ *
+ * Un-supported N3 Features include:
  * <ul>
  *   <li>Reification</li>
  * </ul>
  *
  *
- * TODO: * added namespace prefixes are persisent...
- *
- * @author Gunnar AA. Grimnes <ggr...@cs...>, Daniel Westphal <ma...@d-...>
+ * @author Gunnar AA. Grimnes <ggr...@cs...>
+ * @author Daniel Westphal <ma...@d-...>
  * @version $Id$
  * @package syntax
  * @access public
@@ -33,15 +32,15 @@
 
 class N3Serializer extends Object {
 
-  var $debug; 
+  var $debug;
 
-  var $prefixes; 
+  var $prefixes;
 
   var $done;  // keeps track of already serialized resources
-  var $resourcetext; 
-  var $resourcetext_taken; 
+  var $resourcetext;
+  var $resourcetext_taken;
   var $model;
-  var $res; 
+  var $res;
   var $anon;
 
    /**
@@ -49,120 +48,129 @@
     *
     * @access   public
     */
-  function N3Serializer() { 
+  function N3Serializer() {
     $this->debug=FALSE;
   }
 
 
-  /** 
-   * Adds a new namespace prefix to use. 
-   * Unknown namespaces will become ns0, ns1 etc. 
+  /**
+   * Adds a new namespace prefix to use.
+   * Unknown namespaces will become ns0, ns1 etc.
    * @access public
    * @param string $s
-   * @returns void 
+   * @returns void
    **/
 
-  function addNSPrefix( $ns, $prefix) { 
-    $this->prefixes[$ns]=$prefix; 
+  function addNSPrefix( $ns, $prefix) {
+    $this->prefixes[$ns]=$prefix;
   }
 
   /**
+   * Clears all previously set namespace prefixes
+   */
+  function clearNSPrefixes()
+  {
+    $this->prefixes = array();
+  }
+
+  /**
    * Serializes a model to N3 syntax.
    *
    * @param     object Model $model
    * @return    string
    * @access    public
    */
-  function & serialize(&$m) { 
+  function & serialize(&$m) {
 
-    if (is_a($m, 'DbModel')) 
+    if (is_a($m, 'DbModel'))
     	$m=$m->getMemModel();
-    
+
     $this->reset();
     $this->model=$m;
-    $this->res=""; 
-    
+    $this->res="";
+
+var_dump($this->prefixes);
     // copy default namespaces
     global $default_prefixes;
     foreach($default_prefixes as $prefix => $namespace)
             $this->addNSPrefix($namespace,$prefix);
-    
-    $nps= $this->model->getParsedNamespaces(); 
+
+    $nps= $this->model->getParsedNamespaces();
     if($nps!=false){
     	foreach($nps as $uri => $prefix){
     		$this->addNSPrefix($uri,$prefix);
     	}
     }
-    
+var_dump($this->prefixes);
     $namespaces=array();
     $count=array();
-    $resources=array(); 
-    foreach ($this->model->triples as $t) { 
+    $resources=array();
+    foreach ($this->model->triples as $t) {
       $s=$t->getSubject();
-      if ( is_a($s, 'Resource')) 
+      if ( is_a($s, 'Resource'))
 		$namespaces[$s->getNamespace()]=1;
 
       $p=$t->getPredicate();
-      if ( is_a($p, 'Resource')) 
+      if ( is_a($p, 'Resource'))
 		$namespaces[$p->getNamespace()]=1;
 
       $o=$t->getObject();
-      if ( is_a($o, 'Resource')) 
+      if ( is_a($o, 'Resource'))
 		$namespaces[$o->getNamespace()]=1;
-     
+
       $uri=$s->getURI();
-      
-      if (isset($count[$uri])) { 
+
+      if (isset($count[$uri])) {
 		$count[$uri]++;
-      } else { 	
+      } else {
 		$count[$uri]=0;
 		$resources[$uri]=$s;
       }
     }
 
-    if (!HIDE_ADVERTISE) 
+    if (!HIDE_ADVERTISE)
     	$this->res .= '# Generated by N3Serializer.php from RDF RAP.'.LINEFEED
     	             .'# http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/index.html'
     	             .LINEFEED.LINEFEED;
 
-    $this->doNamespaces($namespaces); 
+    $this->doNamespaces($namespaces);
 
     $this->res.=LINEFEED.LINEFEED;
 
     arsort($count);
-    
-    foreach ( $count as $k=>$v) { 
-      $this->doResource($resources[$k]); 
+
+    foreach ( $count as $k=>$v) {
+      $this->doResource($resources[$k]);
       //      $this->res.=" .\n";
     }
 
     $c=0;
-    foreach ( $this->resourcetext as $r=>$t) { 
+    foreach ( $this->resourcetext as $r=>$t) {
 
       if ( preg_match_all('/'.MAGIC_STRING.'([^ ]+)'.MAGIC_STRING.'/', $t, $ms, PREG_SET_ORDER)) {
 
-	foreach($ms as $mseach) { 
+	foreach($ms as $mseach) {
 	  $rp=$this->resourcetext[$mseach[1]];
 	  $t=preg_replace('/'.MAGIC_STRING.$mseach[1].MAGIC_STRING.'/', $rp, $t);
 	}
       }
 
       if ($this->debug) $this->res.=$c.': ';
-      if ( !( isset($this->resourcetext_taken[$r]) && $this->resourcetext_taken[$r]>0) ) 
-	     $this->res.=$t.' .'.LINEFEED; 
-      else if ( $this->debug ) 
+      if ( !( isset($this->resourcetext_taken[$r]) && $this->resourcetext_taken[$r]>0) )
+	     $this->res.=$t.' .'.LINEFEED;
+      else if ( $this->debug )
          $this->res.=' Skipping : '.$t.LINEFEED;
       $c++;
-    } 
+    }
 
 //     $max=-1111;
 //     $maxkey="";
-//     foreach ($count as $k=>$c) { 
+//     foreach ($count as $k=>$c) {
 //       if ( $c>$max) { $maxkey=$k; $max=$c; }
 //     }
-    
-//     if ($this->debug) { 
-//       print "$maxkey is subject of most triples! ($max) \n"; 
+
+//     if ($this->debug) {
+//       print "$maxkey is subject of most triples! ($max) \n";
 //     }
 
     return $this->res;
@@ -192,8 +200,8 @@
       return FALSE;
    };
  }
-  
 
+
   /* ==================== Private Methods from here ==================== */
 
 
@@ -201,7 +209,7 @@
  * Readies this object for serializing another model
  * @access private
  * @param void
- * @returns void 
+ * @returns void
  **/
   function reset() {
     $this->anon=0;
@@ -210,23 +218,22 @@
     $this->resourcetext=array();
     $this->res='';
     $this->model=NULL;
-    unset($this->prefixes);
   }
 
 /**
- * Makes ns0, ns1 etc. prefixes for unknown prefixes. 
- * Outputs @prefix lines. 
+ * Makes ns0, ns1 etc. prefixes for unknown prefixes.
+ * Outputs @prefix lines.
  * @access private
  * @param array $n
- * @returns void 
+ * @returns void
  **/
-  function doNamespaces(&$n) { 
+  function doNamespaces(&$n) {
     $c=0;
-    foreach ($n as $ns => $nonsense) { 
-      if ( !$ns ) continue;  
+    foreach ($n as $ns => $nonsense) {
+      if ( !$ns ) continue;
       if ( isset($this->prefixes[$ns]) ) {
 	$p=$this->prefixes[$ns];
-      } else { 
+      } else {
 	$p='ns'.$c;
 	$this->prefixes[$ns]=$p;
 	$c++;
@@ -236,42 +243,42 @@
   }
 
 /**
- * Fill in $resourcetext for a single resource. 
- * Will recurse into Objects of triples, but should never look ? (really?) 
+ * Fill in $resourcetext for a single resource.
+ * Will recurse into Objects of triples, but should never look ? (really?)
  * @access private
  * @param object Resource $r
  * @returns boolean
  **/
 
-  function doResource(&$r) { 
-    //    print $r->getURI(); 
+  function doResource(&$r) {
+    //    print $r->getURI();
 
     $ts=$this->model->find($r, null, null);
-    if (count($ts->triples)==0) return; 
-	
+    if (count($ts->triples)==0) return;
+
     $out="";
 
     if ( isset($this->done[$r->getURI()]) && $this->done[$r->getURI()] ) {
-      if ( is_a($r, 'BlankNode')) { 
-      
-      	if ( $this->resourcetext_taken[$r->getURI()] == 1) { 
-	  		//Oh bother, we must use the _:blah construct. 
+      if ( is_a($r, 'BlankNode')) {
+
+      	if ( $this->resourcetext_taken[$r->getURI()] == 1) {
+	  		//Oh bother, we must use the _:blah construct.
 	  		$a=$this->resourcetext[$r->getURI()];
 	  		$this->resourcetext[$r->getURI()]='_:anon'.$this->anon;
 	  		$this->resourcetext['_:anon'.$this->anon]=$this->fixAnon($a, '_:anon'.$this->anon);
-	  		$this->resourcetext_taken[$r->getURI()]=2; 
+	  		$this->resourcetext_taken[$r->getURI()]=2;
 	  		$this->anon++;
 		}
 
       }
-      return false; 
+      return false;
     }
 
     $this->done[$r->getURI()]=TRUE;
 
     if ( is_a($r, 'Resource') ) {
 
-      if ( is_a($r, 'BlankNode') ) { 
+      if ( is_a($r, 'BlankNode') ) {
 
       	 //test, if this blanknode is referenced somewhere
       	$rbn=$this->model->find(null, null, $r);
@@ -280,51 +287,51 @@
       		$out.='_:'.$r->getLabel();
       	} else {
       		$out.='[ ';
-      	};	
-      } else { 
+      	};
+      } else {
 
         $this->doURI($r, $out);
 
       };
     };
-  
+
     usort($ts->triples, 'statementsorter');
     $lastp='';
 
     $out.=' ';
 
-    foreach ($ts->triples as $t) { 
-      
-      $p=$t->getPredicate(); 
-      
+    foreach ($ts->triples as $t) {
+
+      $p=$t->getPredicate();
+
       if ($p == $lastp) {
-	$out.=' , '; 
-      } else { 
-	if ($lastp!='') $out.=' ; '; 
+	$out.=' , ';
+      } else {
+	if ($lastp!='') $out.=' ; ';
 	$this->doURI($p, $out);
 	$lastp=$p;
       }
 
       $out.=' ';
-      
+
       $o=$t->getObject();
-      
-      if ( is_a($o, 'Literal')) { 
+
+      if ( is_a($o, 'Literal')) {
 	$l=$o->getLabel();
-	if ( strpos($l, LINEFEED) === FALSE ) { 
+	if ( strpos($l, LINEFEED) === FALSE ) {
 	  $out.="\"$l\"";
-	} else { 
-	  $out.="\"\"\"$l\"\"\"";	  
+	} else {
+	  $out.="\"\"\"$l\"\"\"";
 	}
-	if ( $o->getLanguage()!='' ) { 
+	if ( $o->getLanguage()!='' ) {
 	  $out.='@'.$o->getLanguage();
 	}
-	if ( $o->getDatatype()!='' ) { 
+	if ( $o->getDatatype()!='' ) {
 	  $out.='^^<'.$o->getDatatype().'>';
 	}
-	
-      } 
-      
+
+      }
+
       if (is_a($o, 'Resource')) {
 	if ($this->debug) print 'Doing object: '.$o->getURI().LINEFEED;
 	if ( is_a($o,'BlankNode')) {
@@ -334,7 +341,7 @@
 //	  $this->resourcetext_taken[$o->getURI()]=1;
 
 	$out .='_:'.$o->getLabel();
-	} else { 
+	} else {
 
 	  $this->doURI($o, $out);
 	}
@@ -342,40 +349,40 @@
     }
 
 	if (isset($rbn) && !count($rbn->triples)>0 && N3SER_BNODE_SHORT) {$out.=' ] ';};
-    $this->resourcetext[$r->getURI()]=$out; 
+    $this->resourcetext[$r->getURI()]=$out;
 
     return TRUE;
   }
 
-  /** 
+  /**
    * Format a single URI
    * @param string $s
    * @access private
    * @return void
    **/
-  function doURI(&$r, &$out) { 
+  function doURI(&$r, &$out) {
     if ( $r->getURI()=='http://www.w3.org/1999/02/22-rdf-syntax-ns#type') {
       $out.='a';
-      return; 
+      return;
     }
     if ($r->getNamespace()!='') {
       $out.=$this->prefixes[$r->getNamespace()].':'.$r->getLocalName();
-    } else { 
-      //Will this ever happen? 
+    } else {
+      //Will this ever happen?
       $out.=$r->getURI();
     }
   }
 
-  
-  /** 
+
+  /**
    * Fix the resourcetext for a blanknode where the _: construct was used
    * @param string $s
    * @param string $a
    * @access private
    * @return void
    **/
-  function fixAnon($t,$a) { 
-    $t=preg_replace("/( \] $|^\[ )/", '', $t); 
+  function fixAnon($t,$a) {
+    $t=preg_replace("/( \] $|^\[ )/", '', $t);
 
     return $a.$t;
   }


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Thread: [Rdfapi-php-svn] SF.net SVN: rdfapi-php: [506] trunk/rdfapi-php/api/syntax/N3Serializer.php

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