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-rw-r--r--core/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Turtle.php250
1 files changed, 172 insertions, 78 deletions
diff --git a/core/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Turtle.php b/core/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Turtle.php
index dfc817d..0a89d38 100644
--- a/core/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Turtle.php
+++ b/core/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Turtle.php
@@ -5,7 +5,7 @@
*
* LICENSE
*
- * Copyright (c) 2009-2012 Nicholas J Humfrey. All rights reserved.
+ * Copyright (c) 2009-2013 Nicholas J Humfrey. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@@ -31,19 +31,18 @@
* POSSIBILITY OF SUCH DAMAGE.
*
* @package EasyRdf
- * @copyright Copyright (c) 2009-2012 Nicholas J Humfrey
+ * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
- * @version $Id$
*/
/**
* Class to serialise an EasyRdf_Graph to Turtle
* with no external dependancies.
*
- * http://www.dajobe.org/2004/01/turtle
+ * http://www.w3.org/TR/turtle/
*
* @package EasyRdf
- * @copyright Copyright (c) 2009-2012 Nicholas J Humfrey
+ * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_Serialiser_Turtle extends EasyRdf_Serialiser
@@ -51,28 +50,26 @@ class EasyRdf_Serialiser_Turtle extends EasyRdf_Serialiser
private $outputtedBnodes = array();
/**
- * @ignore
+ * Given a IRI string, escape and enclose in angle brackets.
+ *
+ * @param string $resourceIri
+ * @return string
*/
- protected function serialiseResource($resource)
+ public static function escapeIri($resourceIri)
{
- if ($resource->isBnode()) {
- return $resource->getUri();
- } else {
- $short = $resource->shorten();
- if ($short) {
- $this->addPrefix($short);
- return $short;
- } else {
- $uri = str_replace('>', '\\>', $resource);
- return "<$resource>";
- }
- }
+ $escapedIri = str_replace('>', '\\>', $resourceIri);
+ return "<$escapedIri>";
}
/**
- * @ignore
+ * Given a string, enclose in quotes and escape any quotes in the string.
+ * Strings containing tabs, linefeeds or carriage returns will be
+ * enclosed in three double quotes (""").
+ *
+ * @param string $value
+ * @return string
*/
- protected function quotedString($value)
+ public static function quotedString($value)
{
if (preg_match("/[\t\n\r]/", $value)) {
$escaped = str_replace(array('\\', '"""'), array('\\\\', '\\"""'), $value);
@@ -84,41 +81,122 @@ class EasyRdf_Serialiser_Turtle extends EasyRdf_Serialiser
}
/**
- * @ignore
+ * Given a an EasyRdf_Resource or URI, convert it into a string, suitable to
+ * be written to a Turtle document. URIs will be shortened into CURIES
+ * where possible.
+ *
+ * @param EasyRdf_Resource $resource The resource to convert to a Turtle string
+ * @param boolean $createNamespace If true, a new namespace may be created
+ * @return string
+ */
+ public function serialiseResource($resource, $createNamespace = false)
+ {
+ if (is_object($resource)) {
+ if ($resource->isBNode()) {
+ return $resource->getUri();
+ } else {
+ $resource = $resource->getUri();
+ }
+ }
+
+ $short = EasyRdf_Namespace::shorten($resource, $createNamespace);
+ if ($short) {
+ $this->addPrefix($short);
+ return $short;
+ } else {
+ return self::escapeIri($resource);
+ }
+ }
+
+ /**
+ * Given an EasyRdf_Literal object, convert it into a string, suitable to
+ * be written to a Turtle document. Supports multiline literals and literals with
+ * datatypes or languages.
+ *
+ * @param EasyRdf_Literal $literal
+ * @return string
+ */
+ public function serialiseLiteral($literal)
+ {
+ $value = strval($literal);
+ $quoted = self::quotedString($value);
+
+ if ($datatype = $literal->getDatatypeUri()) {
+ if ($datatype == 'http://www.w3.org/2001/XMLSchema#integer') {
+ return sprintf('%d', $value);
+ } elseif ($datatype == 'http://www.w3.org/2001/XMLSchema#decimal') {
+ return sprintf('%g', $value);
+ } elseif ($datatype == 'http://www.w3.org/2001/XMLSchema#double') {
+ return sprintf('%e', $value);
+ } elseif ($datatype == 'http://www.w3.org/2001/XMLSchema#boolean') {
+ return sprintf('%s', $value ? 'true' : 'false');
+ } else {
+ $escaped = $this->serialiseResource($datatype, true);
+ return sprintf('%s^^%s', $quoted, $escaped);
+ }
+ } elseif ($lang = $literal->getLang()) {
+ return $quoted . '@' . $lang;
+ } else {
+ return $quoted;
+ }
+ }
+
+ /**
+ * Convert an EasyRdf object into a string suitable to
+ * be written to a Turtle document.
+ *
+ * @param EasyRdf_Resource|EasyRdf_Literal $object
+ * @return string
*/
- protected function serialiseObject($object)
+ public function serialiseObject($object)
{
if ($object instanceof EasyRdf_Resource) {
return $this->serialiseResource($object);
+ } elseif ($object instanceof EasyRdf_Literal) {
+ return $this->serialiseLiteral($object);
} else {
- $value = strval($object);
- $quoted = $this->quotedString($value);
-
- if ($datatype = $object->getDatatypeUri()) {
- $short = EasyRdf_Namespace::shorten($datatype, true);
- if ($short) {
- $this->addPrefix($short);
- if ($short == 'xsd:integer') {
- return sprintf('%d', $value);
- } elseif ($short == 'xsd:decimal') {
- return sprintf('%g', $value);
- } elseif ($short == 'xsd:double') {
- return sprintf('%e', $value);
- } elseif ($short == 'xsd:boolean') {
- return sprintf('%s', $value ? 'true' : 'false');
- } else {
- return sprintf('%s^^%s', $quoted, $short);
- }
+ throw new InvalidArgumentException(
+ "serialiseObject() requires \$object to be ".
+ "of type EasyRdf_Resource or EasyRdf_Literal"
+ );
+ }
+ }
+
+
+ /**
+ * Protected method to serialise a RDF collection
+ * @ignore
+ */
+ protected function serialiseCollection($node, $indent)
+ {
+ $turtle = '(';
+ $count = 0;
+ while ($node) {
+ if ($id = $node->getBNodeId()) {
+ $this->outputtedBnodes[$id] = true;
+ }
+
+ $value = $node->get('rdf:first');
+ $node = $node->get('rdf:rest');
+ if ($node and $node->hasProperty('rdf:first')) {
+ $count++;
+ }
+
+ if ($value !== null) {
+ $serialised = $this->serialiseObject($value);
+ if ($count) {
+ $turtle .= "\n$indent $serialised";
} else {
- $datatypeUri = str_replace('>', '\\>', $datatype);
- return sprintf('%s^^<%s>', $quoted, $datatypeUri);
+ $turtle .= " ".$serialised;
}
- } elseif ($lang = $object->getLang()) {
- return $quoted . '@' . $lang;
- } else {
- return $quoted;
}
}
+ if ($count) {
+ $turtle .= "\n$indent)";
+ } else {
+ $turtle .= " )";
+ }
+ return $turtle;
}
/**
@@ -137,16 +215,10 @@ class EasyRdf_Serialiser_Turtle extends EasyRdf_Serialiser
$pCount = 0;
foreach ($properties as $property) {
- $short = EasyRdf_Namespace::shorten($property, true);
- if ($short) {
- if ($short == 'rdf:type') {
- $pStr = 'a';
- } else {
- $this->addPrefix($short);
- $pStr = $short;
- }
+ if ($property === 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type') {
+ $pStr = 'a';
} else {
- $pStr = '<'.str_replace('>', '\\>', $property).'>';
+ $pStr = $this->serialiseResource($property, true);
}
if ($pCount) {
@@ -161,8 +233,10 @@ class EasyRdf_Serialiser_Turtle extends EasyRdf_Serialiser
$turtle .= ',';
}
- if ($object instanceof EasyRdf_Resource and $object->isBnode()) {
- $id = $object->getNodeId();
+ if ($object instanceof EasyRdf_Collection) {
+ $turtle .= ' ' . $this->serialiseCollection($object, $indent);
+ } elseif ($object instanceof EasyRdf_Resource and $object->isBNode()) {
+ $id = $object->getBNodeId();
$rpcount = $this->reversePropertyCount($object);
if ($rpcount <= 1 and !isset($this->outputtedBnodes[$id])) {
// Nested unlabelled Blank Node
@@ -208,41 +282,33 @@ class EasyRdf_Serialiser_Turtle extends EasyRdf_Serialiser
}
/**
- * Serialise an EasyRdf_Graph to Turtle.
- *
- * @param object EasyRdf_Graph $graph An EasyRdf_Graph object.
- * @param string $format The name of the format to convert to.
- * @return string The RDF in the new desired format.
+ * @ignore
*/
- public function serialise($graph, $format)
+ protected function serialiseSubjects($graph, $filterType)
{
- parent::checkSerialiseParams($graph, $format);
-
- if ($format != 'turtle' and $format != 'n3') {
- throw new EasyRdf_Exception(
- "EasyRdf_Serialiser_Turtle does not support: $format"
- );
- }
-
- $this->prefixes = array();
- $this->outputtedBnodes = array();
-
$turtle = '';
foreach ($graph->resources() as $resource) {
+ /** @var $resource EasyRdf_Resource */
// If the resource has no properties - don't serialise it
$properties = $resource->propertyUris();
if (count($properties) == 0) {
continue;
}
- if ($resource->isBnode()) {
- $id = $resource->getNodeId();
- $rpcount = $this->reversePropertyCount($resource);
+ // Is this node of the right type?
+ $thisType = $resource->isBNode() ? 'bnode' : 'uri';
+ if ($thisType != $filterType) {
+ continue;
+ }
+
+ if ($thisType == 'bnode') {
+ $id = $resource->getBNodeId();
if (isset($this->outputtedBnodes[$id])) {
// Already been serialised
continue;
} else {
$this->outputtedBnodes[$id] = true;
+ $rpcount = $this->reversePropertyCount($resource);
if ($rpcount == 0) {
$turtle .= '[]';
} else {
@@ -256,6 +322,34 @@ class EasyRdf_Serialiser_Turtle extends EasyRdf_Serialiser
$turtle .= $this->serialiseProperties($resource);
$turtle .= "\n";
}
+ return $turtle;
+ }
+
+ /**
+ * Serialise an EasyRdf_Graph to Turtle.
+ *
+ * @param EasyRdf_Graph $graph An EasyRdf_Graph object.
+ * @param string $format The name of the format to convert to.
+ * @param array $options
+ * @throws EasyRdf_Exception
+ * @return string The RDF in the new desired format.
+ */
+ public function serialise($graph, $format, array $options = array())
+ {
+ parent::checkSerialiseParams($graph, $format);
+
+ if ($format != 'turtle' and $format != 'n3') {
+ throw new EasyRdf_Exception(
+ "EasyRdf_Serialiser_Turtle does not support: $format"
+ );
+ }
+
+ $this->prefixes = array();
+ $this->outputtedBnodes = array();
+
+ $turtle = '';
+ $turtle .= $this->serialiseSubjects($graph, 'uri');
+ $turtle .= $this->serialiseSubjects($graph, 'bnode');
if (count($this->prefixes)) {
return $this->serialisePrefixes() . "\n" . $turtle;