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<?php
/**
* EasyRdf
*
* LICENSE
*
* Copyright (c) 2009-2014 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) 2009-2014 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
/**
* A namespace registry and manipulation class.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2014 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_Namespace
{
/** Namespace registry
*
* List of default namespaces come from:
* - http://www.w3.org/2011/rdfa-context/rdfa-1.1
*
* With a few extras added.
*
*/
private static $initial_namespaces = array(
'bibo' => 'http://purl.org/ontology/bibo/',
'cc' => 'http://creativecommons.org/ns#',
'cert' => 'http://www.w3.org/ns/auth/cert#',
'ctag' => 'http://commontag.org/ns#',
'dc' => 'http://purl.org/dc/terms/',
'dc11' => 'http://purl.org/dc/elements/1.1/',
'dcat' => 'http://www.w3.org/ns/dcat#',
'dcterms' => 'http://purl.org/dc/terms/',
'doap' => 'http://usefulinc.com/ns/doap#',
'exif' => 'http://www.w3.org/2003/12/exif/ns#',
'foaf' => 'http://xmlns.com/foaf/0.1/',
'geo' => 'http://www.w3.org/2003/01/geo/wgs84_pos#',
'gr' => 'http://purl.org/goodrelations/v1#',
'grddl' => 'http://www.w3.org/2003/g/data-view#',
'ical' => 'http://www.w3.org/2002/12/cal/icaltzd#',
'ma' => 'http://www.w3.org/ns/ma-ont#',
'og' => 'http://ogp.me/ns#',
'org' => 'http://www.w3.org/ns/org#',
'owl' => 'http://www.w3.org/2002/07/owl#',
'prov' => 'http://www.w3.org/ns/prov#',
'qb' => 'http://purl.org/linked-data/cube#',
'rdf' => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
'rdfa' => 'http://www.w3.org/ns/rdfa#',
'rdfs' => 'http://www.w3.org/2000/01/rdf-schema#',
'rev' => 'http://purl.org/stuff/rev#',
'rif' => 'http://www.w3.org/2007/rif#',
'rr' => 'http://www.w3.org/ns/r2rml#',
'rss' => 'http://purl.org/rss/1.0/',
'schema' => 'http://schema.org/',
'sd' => 'http://www.w3.org/ns/sparql-service-description#',
'sioc' => 'http://rdfs.org/sioc/ns#',
'skos' => 'http://www.w3.org/2004/02/skos/core#',
'skosxl' => 'http://www.w3.org/2008/05/skos-xl#',
'synd' => 'http://purl.org/rss/1.0/modules/syndication/',
'v' => 'http://rdf.data-vocabulary.org/#',
'vcard' => 'http://www.w3.org/2006/vcard/ns#',
'void' => 'http://rdfs.org/ns/void#',
'wdr' => 'http://www.w3.org/2007/05/powder#',
'wdrs' => 'http://www.w3.org/2007/05/powder-s#',
'wot' => 'http://xmlns.com/wot/0.1/',
'xhv' => 'http://www.w3.org/1999/xhtml/vocab#',
'xml' => 'http://www.w3.org/XML/1998/namespace',
'xsd' => 'http://www.w3.org/2001/XMLSchema#',
);
private static $namespaces = null;
private static $default = null;
/** Counter for numbering anonymous namespaces */
private static $anonymousNamespaceCount = 0;
/**
* Return all the namespaces registered
*
* @return array Associative array of all the namespaces.
*/
public static function namespaces()
{
if (self::$namespaces === null) {
self::resetNamespaces();
}
return self::$namespaces;
}
/**
* Resets list of namespaces to the one, which is provided by EasyRDF
* useful for tests, among other things
*/
public static function resetNamespaces()
{
self::$namespaces = self::$initial_namespaces;
}
/**
* Return a namespace given its prefix.
*
* @param string $prefix The namespace prefix (eg 'foaf')
* @return string The namespace URI (eg 'http://xmlns.com/foaf/0.1/')
*/
public static function get($prefix)
{
if (!is_string($prefix) or $prefix === null) {
throw new InvalidArgumentException(
"\$prefix should be a string and cannot be null or empty"
);
}
if (preg_match('/\W/', $prefix)) {
throw new InvalidArgumentException(
"\$prefix should only contain alpha-numeric characters"
);
}
$prefix = strtolower($prefix);
$namespaces = self::namespaces();
if (array_key_exists($prefix, $namespaces)) {
return $namespaces[$prefix];
} else {
return null;
}
}
/**
* Register a new namespace.
*
* @param string $prefix The namespace prefix (eg 'foaf')
* @param string $long The namespace URI (eg 'http://xmlns.com/foaf/0.1/')
*/
public static function set($prefix, $long)
{
if (!is_string($prefix) or $prefix === null) {
throw new InvalidArgumentException(
"\$prefix should be a string and cannot be null or empty"
);
}
if ($prefix !== '') {
// prefix ::= Name minus ":" // see: http://www.w3.org/TR/REC-xml-names/#NT-NCName
// Name ::= NameStartChar (NameChar)* // see: http://www.w3.org/TR/REC-xml/#NT-Name
// NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] |
// [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] |
// [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
// NameChar ::= NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040]
$_name_start_char =
'A-Z_a-z\xc0-\xD6\xd8-\xf6\xf8-\xff\x{0100}-\x{02ff}\x{0370}-\x{037d}' .
'\x{037F}-\x{1FFF}\x{200C}-\x{200D}\x{2070}-\x{218F}\x{2C00}-\x{2FEF}\x{3001}-\x{D7FF}' .
'\x{F900}-\x{FDCF}\x{FDF0}-\x{FFFD}\x{10000}-\x{EFFFF}';
$_name_char =
$_name_start_char .
'\-.0-9\xb7\x{0300}-\x{036f}\x{203f}-\x{2040}';
$regex = "#^[{$_name_start_char}]{1}[{$_name_char}]{0,}$#u";
$match_result = preg_match($regex, $prefix);
if ($match_result === false) {
throw new LogicException('regexp error');
}
if ($match_result === 0) {
throw new InvalidArgumentException(
"\$prefix should match RDFXML-QName specification. got: {$prefix}"
);
}
}
if (!is_string($long) or $long === null or $long === '') {
throw new InvalidArgumentException(
"\$long should be a string and cannot be null or empty"
);
}
$prefix = strtolower($prefix);
$namespaces = self::namespaces();
$namespaces[$prefix] = $long;
self::$namespaces = $namespaces;
}
/**
* Get the default namespace
*
* Returns the URI of the default namespace or null
* if no default namespace is defined.
*
* @return string The URI of the default namespace
*/
public static function getDefault()
{
return self::$default;
}
/**
* Set the default namespace
*
* Set the default namespace to either a URI or the prefix of
* an already defined namespace.
*
* Example:
* EasyRdf_Namespace::setDefault('http://schema.org/');
*
* @param string $namespace The URI or prefix of a namespace (eg 'og')
*/
public static function setDefault($namespace)
{
if (is_null($namespace) or $namespace === '') {
self::$default = null;
} elseif (preg_match('/^\w+$/', $namespace)) {
$namespaces = self::namespaces();
if (!isset($namespaces[$namespace])) {
throw new InvalidArgumentException(
"Unable to set default namespace to unknown prefix: $namespace"
);
}
self::$default = $namespaces[$namespace];
} else {
self::$default = $namespace;
}
}
/**
* Delete an existing namespace.
*
* @param string $prefix The namespace prefix (eg 'foaf')
*/
public static function delete($prefix)
{
if (!is_string($prefix) or $prefix === null or $prefix === '') {
throw new InvalidArgumentException(
"\$prefix should be a string and cannot be null or empty"
);
}
$prefix = strtolower($prefix);
self::namespaces(); // make sure, that self::$namespaces is initialized
if (isset(self::$namespaces[$prefix])) {
unset(self::$namespaces[$prefix]);
}
}
/**
* Delete the anonymous namespaces and reset the counter to 0
*/
public static function reset()
{
while (self::$anonymousNamespaceCount > 0) {
self::delete('ns'.(self::$anonymousNamespaceCount-1));
self::$anonymousNamespaceCount--;
}
}
/**
* Try and breakup a URI into a prefix and local part
*
* If $createNamespace is true, and the URI isn't part of an existing
* namespace, then EasyRdf will attempt to create a new namespace and
* return the name of the new prefix (for example 'ns0', 'term').
*
* If it isn't possible to split the URI, then null will be returned.
*
* @param string $uri The full URI (eg 'http://xmlns.com/foaf/0.1/name')
* @param bool $createNamespace If true, a new namespace will be created
* @return array The split URI (eg 'foaf', 'name') or null
*/
public static function splitUri($uri, $createNamespace = false)
{
if ($uri === null or $uri === '') {
throw new InvalidArgumentException(
"\$uri cannot be null or empty"
);
}
if (is_object($uri) and ($uri instanceof EasyRdf_Resource)) {
$uri = $uri->getUri();
} elseif (!is_string($uri)) {
throw new InvalidArgumentException(
"\$uri should be a string or EasyRdf_Resource"
);
}
foreach (self::namespaces() as $prefix => $long) {
if (substr($uri, 0, strlen($long)) !== $long) {
continue;
}
$local_part = substr($uri, strlen($long));
if (strpos($local_part, '/') !== false) {
// we can't have '/' in local part
continue;
}
return array($prefix, $local_part);
}
if ($createNamespace) {
// Try and create a new namespace
# FIXME: check the valid characters for an XML element name
if (preg_match('/^(.+?)([\w\-]+)$/', $uri, $matches)) {
$prefix = "ns".(self::$anonymousNamespaceCount++);
self::set($prefix, $matches[1]);
return array($prefix, $matches[2]);
}
}
return null;
}
/**
* Return the prefix namespace that a URI belongs to.
*
* @param string $uri A full URI (eg 'http://xmlns.com/foaf/0.1/name')
* @return string The prefix namespace that it is a part of(eg 'foaf')
*/
public static function prefixOfUri($uri)
{
if ($parts = self::splitUri($uri)) {
return $parts[0];
}
}
/**
* Shorten a URI by substituting in the namespace prefix.
*
* If $createNamespace is true, and the URI isn't part of an existing
* namespace, then EasyRdf will attempt to create a new namespace and
* use that namespace to shorten the URI (for example ns0:term).
*
* If it isn't possible to shorten the URI, then null will be returned.
*
* @param string $uri The full URI (eg 'http://xmlns.com/foaf/0.1/name')
* @param bool $createNamespace If true, a new namespace will be created
* @return string The shortened URI (eg 'foaf:name') or null
*/
public static function shorten($uri, $createNamespace = false)
{
if ($parts = self::splitUri($uri, $createNamespace)) {
return implode(':', $parts);
}
}
/**
* Expand a shortened URI (qname) back into a full URI.
*
* If it isn't possible to expand the qname, for example if the namespace
* isn't registered, then the original string will be returned.
*
* @param string $shortUri The short URI (eg 'foaf:name')
* @return string The full URI (eg 'http://xmlns.com/foaf/0.1/name')
*/
public static function expand($shortUri)
{
if (!is_string($shortUri) or $shortUri === '') {
throw new InvalidArgumentException(
"\$shortUri should be a string and cannot be null or empty"
);
}
if ($shortUri === 'a') {
$namespaces = self::namespaces();
return $namespaces['rdf'] . 'type';
} elseif (preg_match('/^(\w+?):([\w\-]+)$/', $shortUri, $matches)) {
$long = self::get($matches[1]);
if ($long) {
return $long . $matches[2];
}
} elseif (preg_match('/^(\w+)$/', $shortUri) and isset(self::$default)) {
return self::$default . $shortUri;
}
return $shortUri;
}
}