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<?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
*/
/**
* A RFC3986 compliant URI parser
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
* @link http://www.ietf.org/rfc/rfc3986.txt
*/
class EasyRdf_ParsedUri
{
// For all URIs:
private $scheme = null;
private $fragment = null;
// For hierarchical URIs:
private $authority = null;
private $path = null;
private $query = null;
const URI_REGEX = "|^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?|";
/** Constructor for creating a new parsed URI
*
* The $uri parameter can either be a string or an
* associative array with the following keys:
* scheme, authority, path, query, fragment
*
* @param mixed $uri The URI as a string or an array
* @return object EasyRdf_ParsedUri
*/
public function __construct($uri = null)
{
if (is_string($uri)) {
if (preg_match(self::URI_REGEX, $uri, $matches)) {
if (!empty($matches[1])) {
$this->scheme = isset($matches[2]) ? $matches[2] : '';
}
if (!empty($matches[3])) {
$this->authority = isset($matches[4]) ? $matches[4] : '';
}
$this->path = isset($matches[5]) ? $matches[5] : '';
if (!empty($matches[6])) {
$this->query = isset($matches[7]) ? $matches[7] : '';
}
if (!empty($matches[8])) {
$this->fragment = isset($matches[9]) ? $matches[9] : '';
}
}
} elseif (is_array($uri)) {
$this->scheme = isset($uri['scheme']) ? $uri['scheme'] : null;
$this->authority = isset($uri['authority']) ? $uri['authority'] : null;
$this->path = isset($uri['path']) ? $uri['path'] : null;
$this->query = isset($uri['query']) ? $uri['query'] : null;
$this->fragment = isset($uri['fragment']) ? $uri['fragment'] : null;
}
}
/** Returns true if this is an absolute (complete) URI
* @return boolean
*/
public function isAbsolute()
{
return $this->scheme !== null;
}
/** Returns true if this is an relative (partial) URI
* @return boolean
*/
public function isRelative()
{
return $this->scheme === null;
}
/** Returns the scheme of the URI (e.g. http)
* @return string
*/
public function getScheme()
{
return $this->scheme;
}
/** Sets the scheme of the URI (e.g. http)
* @param string $scheme The new value for the scheme of the URI
*/
public function setScheme($scheme)
{
$this->scheme = $scheme;
}
/** Returns the authority of the URI (e.g. www.example.com:8080)
* @return string
*/
public function getAuthority()
{
return $this->authority;
}
/** Sets the authority of the URI (e.g. www.example.com:8080)
* @param string $authority The new value for the authority component of the URI
*/
public function setAuthority($authority)
{
$this->authority = $authority;
}
/** Returns the path of the URI (e.g. /foo/bar)
* @return string
*/
public function getPath()
{
return $this->path;
}
/** Set the path of the URI (e.g. /foo/bar)
* @param string $path The new value for the path component of the URI
*/
public function setPath($path)
{
$this->path = $path;
}
/** Returns the query string part of the URI (e.g. foo=bar)
* @return string
*/
public function getQuery()
{
return $this->query;
}
/** Set the query string of the URI (e.g. foo=bar)
* @param string $query The new value for the query string component of the URI
*/
public function setQuery($query)
{
$this->query = $query;
}
/** Returns the fragment part of the URI (i.e. after the #)
* @return string
*/
public function getFragment()
{
return $this->fragment;
}
/** Set the fragment of the URI (i.e. after the #)
* @param string $fragment The new value for the fragment component of the URI
*/
public function setFragment($fragment)
{
$this->fragment = $fragment;
}
/**
* Normalises the path of this URI if it has one. Normalising a path means
* that any unnecessary '.' and '..' segments are removed. For example, the
* URI http://example.com/a/b/../c/./d would be normalised to
* http://example.com/a/c/d
*
* @return object EasyRdf_ParsedUri
*/
public function normalise()
{
if (empty($this->path)) {
return $this;
}
// Remove ./ from the start
if (substr($this->path, 0, 2) == './') {
// Remove both characters
$this->path = substr($this->path, 2);
}
// Remove /. from the end
if (substr($this->path, -2) == '/.') {
// Remove only the last dot, not the slash!
$this->path = substr($this->path, 0, -1);
}
if (substr($this->path, -3) == '/..') {
$this->path .= '/';
}
// Split the path into its segments
$segments = explode('/', $this->path);
$newSegments = array();
// Remove all unnecessary '.' and '..' segments
foreach ($segments as $segment) {
if ($segment == '..') {
// Remove the previous part of the path
$count = count($newSegments);
if ($count > 0 && $newSegments[$count-1]) {
array_pop($newSegments);
}
} elseif ($segment == '.') {
// Ignore
continue;
} else {
array_push($newSegments, $segment);
}
}
// Construct the new normalised path
$this->path = implode($newSegments, '/');
// Allow easy chaining of methods
return $this;
}
/**
* Resolves a relative URI using this URI as the base URI.
*/
public function resolve($relUri)
{
// If it is a string, then convert it to a parsed object
if (is_string($relUri)) {
$relUri = new EasyRdf_ParsedUri($relUri);
}
// This code is based on the pseudocode in section 5.2.2 of RFC3986
$target = new EasyRdf_ParsedUri();
if ($relUri->scheme) {
$target->scheme = $relUri->scheme;
$target->authority = $relUri->authority;
$target->path = $relUri->path;
$target->query = $relUri->query;
} else {
if ($relUri->authority) {
$target->authority = $relUri->authority;
$target->path = $relUri->path;
$target->query = $relUri->query;
} else {
if (empty($relUri->path)) {
$target->path = $this->path;
if ($relUri->query) {
$target->query = $relUri->query;
} else {
$target->query = $this->query;
}
} else {
if (substr($relUri->path, 0, 1) == '/') {
$target->path = $relUri->path;
} else {
$path = $this->path;
$lastSlash = strrpos($path, '/');
if ($lastSlash !== false) {
$path = substr($path, 0, $lastSlash + 1);
} else {
$path = '/';
}
$target->path .= $path . $relUri->path;
}
$target->query = $relUri->query;
}
$target->authority = $this->authority;
}
$target->scheme = $this->scheme;
}
$target->fragment = $relUri->fragment;
$target->normalise();
return $target;
}
/** Convert the parsed URI back into a string
*
* @return string The URI as a string
*/
public function toString()
{
$str = '';
if ($this->scheme !== null) {
$str .= $this->scheme . ':';
}
if ($this->authority !== null) {
$str .= '//' . $this->authority;
}
$str .= $this->path;
if ($this->query !== null) {
$str .= '?' . $this->query;
}
if ($this->fragment !== null) {
$str .= '#' . $this->fragment;
}
return $str;
}
/** Magic method to convert the URI, when casted, back to a string
*
* @return string The URI as a string
*/
public function __toString()
{
return $this->toString();
}
}