--- /dev/null
+<?php
+
+/**
+ * EasyRdf
+ *
+ * LICENSE
+ *
+ * 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:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
+ * promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @package EasyRdf
+ * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+
+/**
+ * Class that represents an RDF Literal
+ *
+ * @package EasyRdf
+ * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Literal
+{
+ /** @ignore a mapping from datatype uri to class name */
+ private static $datatypeMap = array();
+
+ /** @ignore A mapping from class name to datatype URI */
+ private static $classMap = array();
+
+ /** @ignore The string value for this literal */
+ protected $value = null;
+
+ /** @ignore The language of the literal (e.g. 'en') */
+ protected $lang = null;
+
+ /** @ignore The datatype URI of the literal */
+ protected $datatype = null;
+
+
+ /** Create a new literal object
+ *
+ * PHP values of type bool, int or float, will automatically be converted
+ * to the corresponding datatype and PHP sub-class.
+ *
+ * If a registered datatype is given, then the registered subclass of EasyRdf_Literal
+ * will instantiated.
+ *
+ * Note that literals are not required to have a language or datatype.
+ * Literals cannot have both a language and a datatype.
+ *
+ * @param mixed $value The value of the literal or an associative array
+ * @param string $lang The natural language of the literal or null (e.g. 'en')
+ * @param string $datatype The datatype of the literal or null (e.g. 'xsd:integer')
+ * @return object EasyRdf_Literal (or subclass of EasyRdf_Literal)
+ */
+ public static function create($value, $lang = null, $datatype = null)
+ {
+ if (EasyRdf_Utils::isAssociativeArray($value)) {
+ if (isset($value['xml:lang'])) {
+ $lang = $value['xml:lang'];
+ } elseif (isset($value['lang'])) {
+ $lang = $value['lang'];
+ }
+ if (isset($value['datatype'])) {
+ $datatype = $value['datatype'];
+ }
+ $value = isset($value['value']) ? $value['value'] : null;
+ }
+
+ if (is_null($datatype) or $datatype === '') {
+ if (is_null($lang) or $lang === '') {
+ // Automatic datatype selection
+ $datatype = self::getDatatypeForValue($value);
+ }
+ } elseif (is_object($datatype)) {
+ $datatype = strval($datatype);
+ } else {
+ // Expand shortened URIs (qnames)
+ $datatype = EasyRdf_Namespace::expand($datatype);
+ }
+
+ // Work out what class to use for this datatype
+ if (isset(self::$datatypeMap[$datatype])) {
+ $class = self::$datatypeMap[$datatype];
+ } else {
+ $class = 'EasyRdf_Literal';
+ }
+ return new $class($value, $lang, $datatype);
+ }
+
+ /** Register an RDF datatype with a PHP class name
+ *
+ * When parsing registered class will be used whenever the datatype
+ * is seen.
+ *
+ * When serialising a registered class, the mapping will be used to
+ * set the datatype in the RDF.
+ *
+ * Example:
+ * EasyRdf_Literal::registerDatatype('xsd:dateTime', 'My_DateTime_Class');
+ *
+ * @param string $datatype The RDF datatype (e.g. xsd:dateTime)
+ * @param string $class The PHP class name (e.g. My_DateTime_Class)
+ */
+ public static function setDatatypeMapping($datatype, $class)
+ {
+ if (!is_string($datatype) or $datatype == null or $datatype == '') {
+ throw new InvalidArgumentException(
+ "\$datatype should be a string and cannot be null or empty"
+ );
+ }
+
+ if (!is_string($class) or $class == null or $class == '') {
+ throw new InvalidArgumentException(
+ "\$class should be a string and cannot be null or empty"
+ );
+ }
+
+ $datatype = EasyRdf_Namespace::expand($datatype);
+ self::$datatypeMap[$datatype] = $class;
+ self::$classMap[$class] = $datatype;
+ }
+
+ /** Remove the mapping between an RDF datatype and a PHP class name
+ *
+ * @param string $datatype The RDF datatype (e.g. xsd:dateTime)
+ */
+ public static function deleteDatatypeMapping($datatype)
+ {
+ if (!is_string($datatype) or $datatype == null or $datatype == '') {
+ throw new InvalidArgumentException(
+ "\$datatype should be a string and cannot be null or empty"
+ );
+ }
+
+ $datatype = EasyRdf_Namespace::expand($datatype);
+ if (isset(self::$datatypeMap[$datatype])) {
+ $class = self::$datatypeMap[$datatype];
+ unset(self::$datatypeMap[$datatype]);
+ unset(self::$classMap[$class]);
+ }
+ }
+
+ /** Get datatype URI for a PHP value.
+ *
+ * This static function is intended for internal use.
+ * Given a PHP value, it will return an XSD datatype
+ * URI for that value, for example:
+ * http://www.w3.org/2001/XMLSchema#integer
+ *
+ * @return string A URI for the datatype of $value.
+ */
+ public static function getDatatypeForValue($value)
+ {
+ if (is_float($value)) {
+ return 'http://www.w3.org/2001/XMLSchema#double';
+ } elseif (is_int($value)) {
+ return 'http://www.w3.org/2001/XMLSchema#integer';
+ } elseif (is_bool($value)) {
+ return 'http://www.w3.org/2001/XMLSchema#boolean';
+ } elseif (is_object($value) and $value instanceof DateTime) {
+ return 'http://www.w3.org/2001/XMLSchema#dateTime';
+ } else {
+ return null;
+ }
+ }
+
+
+
+ /** Constructor for creating a new literal
+ *
+ * @param string $value The value of the literal
+ * @param string $lang The natural language of the literal or null (e.g. 'en')
+ * @param string $datatype The datatype of the literal or null (e.g. 'xsd:string')
+ * @return object EasyRdf_Literal
+ */
+ public function __construct($value, $lang = null, $datatype = null)
+ {
+ $this->value = $value;
+ $this->lang = $lang ? $lang : null;
+ $this->datatype = $datatype ? $datatype : null;
+
+ if ($this->datatype) {
+ if (is_object($this->datatype)) {
+ // Convert objects to strings
+ $this->datatype = strval($this->datatype);
+ } else {
+ // Expand shortened URIs (CURIEs)
+ $this->datatype = EasyRdf_Namespace::expand($this->datatype);
+ }
+
+ // Literals can not have both a language and a datatype
+ $this->lang = null;
+ } else {
+ // Set the datatype based on the subclass
+ $class = get_class($this);
+ if (isset(self::$classMap[$class])) {
+ $this->datatype = self::$classMap[$class];
+ $this->lang = null;
+ }
+ }
+
+ if (is_float($this->value)) {
+ // special handling of floats, as they suffer from locale [mis]configuration
+ $this->value = rtrim(sprintf('%F', $this->value), '0');
+ } else {
+ // Cast value to string
+ settype($this->value, 'string');
+ }
+ }
+
+ /** Returns the value of the literal.
+ *
+ * @return string Value of this literal.
+ */
+ public function getValue()
+ {
+ return $this->value;
+ }
+
+ /** Returns the full datatype URI of the literal.
+ *
+ * @return string Datatype URI of this literal.
+ */
+ public function getDatatypeUri()
+ {
+ return $this->datatype;
+ }
+
+ /** Returns the shortened datatype URI of the literal.
+ *
+ * @return string Datatype of this literal (e.g. xsd:integer).
+ */
+ public function getDatatype()
+ {
+ if ($this->datatype) {
+ return EasyRdf_Namespace::shorten($this->datatype);
+ } else {
+ return null;
+ }
+ }
+
+ /** Returns the language of the literal.
+ *
+ * @return string Language of this literal.
+ */
+ public function getLang()
+ {
+ return $this->lang;
+ }
+
+ /** Returns the properties of the literal as an associative array
+ *
+ * For example:
+ * array('type' => 'literal', 'value' => 'string value')
+ *
+ * @return array The properties of the literal
+ */
+ public function toRdfPhp()
+ {
+ $array = array(
+ 'type' => 'literal',
+ 'value' => $this->value
+ );
+
+ if ($this->datatype) {
+ $array['datatype'] = $this->datatype;
+ }
+
+ if ($this->lang) {
+ $array['lang'] = $this->lang;
+ }
+
+ return $array;
+ }
+
+ /** Magic method to return the value of a literal as a string
+ *
+ * @return string The value of the literal
+ */
+ public function __toString()
+ {
+ return isset($this->value) ? $this->value : '';
+ }
+
+ /** Return pretty-print view of the literal
+ *
+ * @param string $format Either 'html' or 'text'
+ * @param string $color The colour of the text
+ * @return string
+ */
+ public function dumpValue($format = 'html', $color = 'black')
+ {
+ return EasyRdf_Utils::dumpLiteralValue($this, $format, $color);
+ }
+}
+
+/*
+ Register default set of datatype classes
+*/
+
+EasyRdf_Literal::setDatatypeMapping('xsd:boolean', 'EasyRdf_Literal_Boolean');
+EasyRdf_Literal::setDatatypeMapping('xsd:date', 'EasyRdf_Literal_Date');
+EasyRdf_Literal::setDatatypeMapping('xsd:dateTime', 'EasyRdf_Literal_DateTime');
+EasyRdf_Literal::setDatatypeMapping('xsd:decimal', 'EasyRdf_Literal_Decimal');
+EasyRdf_Literal::setDatatypeMapping('xsd:hexBinary', 'EasyRdf_Literal_HexBinary');
+EasyRdf_Literal::setDatatypeMapping('rdf:HTML', 'EasyRdf_Literal_HTML');
+EasyRdf_Literal::setDatatypeMapping('xsd:integer', 'EasyRdf_Literal_Integer');
+EasyRdf_Literal::setDatatypeMapping('rdf:XMLLiteral', 'EasyRdf_Literal_XML');
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