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/**
 * SimplePie
 *
 * A PHP-Based RSS and Atom Feed Framework.
 * Takes the hard work out of managing a complete RSS/Atom solution.
 *
 * Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 	* Redistributions of source code must retain the above copyright notice, this list of
 * 	  conditions and the following disclaimer.
 *
 * 	* 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.
 *
 * 	* Neither the name of the SimplePie Team nor the names of its contributors 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 &quot;AS IS&quot; 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 HOLDERS
 * AND 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 SimplePie
 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
 * @author Ryan Parman
 * @author Sam Sneddon
 * @author Ryan McCue
 * @link http://simplepie.org/ SimplePie
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */

/**
 * IRI parser/serialiser/normaliser
 *
 * @package SimplePie
 * @subpackage HTTP
 * @author Sam Sneddon
 * @author Steve Minutillo
 * @author Ryan McCue
 * @copyright 2007-2012 Sam Sneddon, Steve Minutillo, Ryan McCue
 * @license http://www.opensource.org/licenses/bsd-license.php
 */
class SimplePie_IRI
{
	/**
	 * Scheme
	 *
	 * @var string
	 */
	protected $scheme = null;

	/**
	 * User Information
	 *
	 * @var string
	 */
	protected $iuserinfo = null;

	/**
	 * ihost
	 *
	 * @var string
	 */
	protected $ihost = null;

	/**
	 * Port
	 *
	 * @var string
	 */
	protected $port = null;

	/**
	 * ipath
	 *
	 * @var string
	 */
	protected $ipath = &#039;&#039;;

	/**
	 * iquery
	 *
	 * @var string
	 */
	protected $iquery = null;

	/**
	 * ifragment
	 *
	 * @var string
	 */
	protected $ifragment = null;

	/**
	 * Normalization database
	 *
	 * Each key is the scheme, each value is an array with each key as the IRI
	 * part and value as the default value for that part.
	 */
	protected $normalization = array(
		&#039;acap&#039; =&gt; array(
			&#039;port&#039; =&gt; 674
		),
		&#039;dict&#039; =&gt; array(
			&#039;port&#039; =&gt; 2628
		),
		&#039;file&#039; =&gt; array(
			&#039;ihost&#039; =&gt; &#039;localhost&#039;
		),
		&#039;http&#039; =&gt; array(
			&#039;port&#039; =&gt; 80,
			&#039;ipath&#039; =&gt; &#039;/&#039;
		),
		&#039;https&#039; =&gt; array(
			&#039;port&#039; =&gt; 443,
			&#039;ipath&#039; =&gt; &#039;/&#039;
		),
	);

	/**
	 * Return the entire IRI when you try and read the object as a string
	 *
	 * @return string
	 */
	public function __toString()
	{
		return $this-&gt;get_iri();
	}

	/**
	 * Overload __set() to provide access via properties
	 *
	 * @param string $name Property name
	 * @param mixed $value Property value
	 */
	public function __set($name, $value)
	{
		if (method_exists($this, &#039;set_&#039; . $name))
		{
			call_user_func(array($this, &#039;set_&#039; . $name), $value);
		}
		elseif (
			   $name === &#039;iauthority&#039;
			|| $name === &#039;iuserinfo&#039;
			|| $name === &#039;ihost&#039;
			|| $name === &#039;ipath&#039;
			|| $name === &#039;iquery&#039;
			|| $name === &#039;ifragment&#039;
		)
		{
			call_user_func(array($this, &#039;set_&#039; . substr($name, 1)), $value);
		}
	}

	/**
	 * Overload __get() to provide access via properties
	 *
	 * @param string $name Property name
	 * @return mixed
	 */
	public function __get($name)
	{
		// isset() returns false for null, we don&#039;t want to do that
		// Also why we use array_key_exists below instead of isset()
		$props = get_object_vars($this);

		if (
			$name === &#039;iri&#039; ||
			$name === &#039;uri&#039; ||
			$name === &#039;iauthority&#039; ||
			$name === &#039;authority&#039;
		)
		{
			$return = $this-&gt;{&quot;get_$name&quot;}();
		}
		elseif (array_key_exists($name, $props))
		{
			$return = $this-&gt;$name;
		}
		// host -&gt; ihost
		elseif (($prop = &#039;i&#039; . $name) &amp;&amp; array_key_exists($prop, $props))
		{
			$name = $prop;
			$return = $this-&gt;$prop;
		}
		// ischeme -&gt; scheme
		elseif (($prop = substr($name, 1)) &amp;&amp; array_key_exists($prop, $props))
		{
			$name = $prop;
			$return = $this-&gt;$prop;
		}
		else
		{
			trigger_error(&#039;Undefined property: &#039; . get_class($this) . &#039;::&#039; . $name, E_USER_NOTICE);
			$return = null;
		}

		if ($return === null &amp;&amp; isset($this-&gt;normalization[$this-&gt;scheme][$name]))
		{
			return $this-&gt;normalization[$this-&gt;scheme][$name];
		}

		return $return;
	}

	/**
	 * Overload __isset() to provide access via properties
	 *
	 * @param string $name Property name
	 * @return bool
	 */
	public function __isset($name)
	{
		return method_exists($this, &#039;get_&#039; . $name) || isset($this-&gt;$name);
	}

	/**
	 * Overload __unset() to provide access via properties
	 *
	 * @param string $name Property name
	 */
	public function __unset($name)
	{
		if (method_exists($this, &#039;set_&#039; . $name))
		{
			call_user_func(array($this, &#039;set_&#039; . $name), &#039;&#039;);
		}
	}

	/**
	 * Create a new IRI object, from a specified string
	 *
	 * @param string $iri
	 */
	public function __construct($iri = null)
	{
		$this-&gt;set_iri($iri);
	}

	/**
	 * Clean up
	 */
	public function __destruct() {
	    $this-&gt;set_iri(null, true);
	    $this-&gt;set_path(null, true);
	    $this-&gt;set_authority(null, true);
	}

	/**
	 * Create a new IRI object by resolving a relative IRI
	 *
	 * Returns false if $base is not absolute, otherwise an IRI.
	 *
	 * @param IRI|string $base (Absolute) Base IRI
	 * @param IRI|string $relative Relative IRI
	 * @return IRI|false
	 */
	public static function absolutize($base, $relative)
	{
		if (!($relative instanceof SimplePie_IRI))
		{
			$relative = new SimplePie_IRI($relative);
		}
		if (!$relative-&gt;is_valid())
		{
			return false;
		}
		elseif ($relative-&gt;scheme !== null)
		{
			return clone $relative;
		}
		else
		{
			if (!($base instanceof SimplePie_IRI))
			{
				$base = new SimplePie_IRI($base);
			}
			if ($base-&gt;scheme !== null &amp;&amp; $base-&gt;is_valid())
			{
				if ($relative-&gt;get_iri() !== &#039;&#039;)
				{
					if ($relative-&gt;iuserinfo !== null || $relative-&gt;ihost !== null || $relative-&gt;port !== null)
					{
						$target = clone $relative;
						$target-&gt;scheme = $base-&gt;scheme;
					}
					else
					{
						$target = new SimplePie_IRI;
						$target-&gt;scheme = $base-&gt;scheme;
						$target-&gt;iuserinfo = $base-&gt;iuserinfo;
						$target-&gt;ihost = $base-&gt;ihost;
						$target-&gt;port = $base-&gt;port;
						if ($relative-&gt;ipath !== &#039;&#039;)
						{
							if ($relative-&gt;ipath[0] === &#039;/&#039;)
							{
								$target-&gt;ipath = $relative-&gt;ipath;
							}
							elseif (($base-&gt;iuserinfo !== null || $base-&gt;ihost !== null || $base-&gt;port !== null) &amp;&amp; $base-&gt;ipath === &#039;&#039;)
							{
								$target-&gt;ipath = &#039;/&#039; . $relative-&gt;ipath;
							}
							elseif (($last_segment = strrpos($base-&gt;ipath, &#039;/&#039;)) !== false)
							{
								$target-&gt;ipath = substr($base-&gt;ipath, 0, $last_segment + 1) . $relative-&gt;ipath;
							}
							else
							{
								$target-&gt;ipath = $relative-&gt;ipath;
							}
							$target-&gt;ipath = $target-&gt;remove_dot_segments($target-&gt;ipath);
							$target-&gt;iquery = $relative-&gt;iquery;
						}
						else
						{
							$target-&gt;ipath = $base-&gt;ipath;
							if ($relative-&gt;iquery !== null)
							{
								$target-&gt;iquery = $relative-&gt;iquery;
							}
							elseif ($base-&gt;iquery !== null)
							{
								$target-&gt;iquery = $base-&gt;iquery;
							}
						}
						$target-&gt;ifragment = $relative-&gt;ifragment;
					}
				}
				else
				{
					$target = clone $base;
					$target-&gt;ifragment = null;
				}
				$target-&gt;scheme_normalization();
				return $target;
			}

			return false;
		}
	}

	/**
	 * Parse an IRI into scheme/authority/path/query/fragment segments
	 *
	 * @param string $iri
	 * @return array
	 */
	protected function parse_iri($iri)
	{
		$iri = trim($iri, &quot;\x20\x09\x0A\x0C\x0D&quot;);
		if (preg_match(&#039;/^((?P&lt;scheme&gt;[^:\/?#]+):)?(\/\/(?P&lt;authority&gt;[^\/?#]*))?(?P&lt;path&gt;[^?#]*)(\?(?P&lt;query&gt;[^#]*))?(#(?P&lt;fragment&gt;.*))?$/&#039;, $iri, $match))
		{
			if ($match[1] === &#039;&#039;)
			{
				$match[&#039;scheme&#039;] = null;
			}
			if (!isset($match[3]) || $match[3] === &#039;&#039;)
			{
				$match[&#039;authority&#039;] = null;
			}
			if (!isset($match[5]))
			{
				$match[&#039;path&#039;] = &#039;&#039;;
			}
			if (!isset($match[6]) || $match[6] === &#039;&#039;)
			{
				$match[&#039;query&#039;] = null;
			}
			if (!isset($match[8]) || $match[8] === &#039;&#039;)
			{
				$match[&#039;fragment&#039;] = null;
			}
			return $match;
		}

		// This can occur when a paragraph is accidentally parsed as a URI
		return false;
	}

	/**
	 * Remove dot segments from a path
	 *
	 * @param string $input
	 * @return string
	 */
	protected function remove_dot_segments($input)
	{
		$output = &#039;&#039;;
		while (strpos($input, &#039;./&#039;) !== false || strpos($input, &#039;/.&#039;) !== false || $input === &#039;.&#039; || $input === &#039;..&#039;)
		{
			// A: If the input buffer begins with a prefix of &quot;../&quot; or &quot;./&quot;, then remove that prefix from the input buffer; otherwise,
			if (strpos($input, &#039;../&#039;) === 0)
			{
				$input = substr($input, 3);
			}
			elseif (strpos($input, &#039;./&#039;) === 0)
			{
				$input = substr($input, 2);
			}
			// B: if the input buffer begins with a prefix of &quot;/./&quot; or &quot;/.&quot;, where &quot;.&quot; is a complete path segment, then replace that prefix with &quot;/&quot; in the input buffer; otherwise,
			elseif (strpos($input, &#039;/./&#039;) === 0)
			{
				$input = substr($input, 2);
			}
			elseif ($input === &#039;/.&#039;)
			{
				$input = &#039;/&#039;;
			}
			// C: if the input buffer begins with a prefix of &quot;/../&quot; or &quot;/..&quot;, where &quot;..&quot; is a complete path segment, then replace that prefix with &quot;/&quot; in the input buffer and remove the last segment and its preceding &quot;/&quot; (if any) from the output buffer; otherwise,
			elseif (strpos($input, &#039;/../&#039;) === 0)
			{
				$input = substr($input, 3);
				$output = substr_replace($output, &#039;&#039;, strrpos($output, &#039;/&#039;));
			}
			elseif ($input === &#039;/..&#039;)
			{
				$input = &#039;/&#039;;
				$output = substr_replace($output, &#039;&#039;, strrpos($output, &#039;/&#039;));
			}
			// D: if the input buffer consists only of &quot;.&quot; or &quot;..&quot;, then remove that from the input buffer; otherwise,
			elseif ($input === &#039;.&#039; || $input === &#039;..&#039;)
			{
				$input = &#039;&#039;;
			}
			// E: move the first path segment in the input buffer to the end of the output buffer, including the initial &quot;/&quot; character (if any) and any subsequent characters up to, but not including, the next &quot;/&quot; character or the end of the input buffer
			elseif (($pos = strpos($input, &#039;/&#039;, 1)) !== false)
			{
				$output .= substr($input, 0, $pos);
				$input = substr_replace($input, &#039;&#039;, 0, $pos);
			}
			else
			{
				$output .= $input;
				$input = &#039;&#039;;
			}
		}
		return $output . $input;
	}

	/**
	 * Replace invalid character with percent encoding
	 *
	 * @param string $string Input string
	 * @param string $extra_chars Valid characters not in iunreserved or
	 *                            iprivate (this is ASCII-only)
	 * @param bool $iprivate Allow iprivate
	 * @return string
	 */
	protected function replace_invalid_with_pct_encoding($string, $extra_chars, $iprivate = false)
	{
		// Normalize as many pct-encoded sections as possible
		$string = preg_replace_callback(&#039;/(?:%[A-Fa-f0-9]{2})+/&#039;, array($this, &#039;remove_iunreserved_percent_encoded&#039;), $string);

		// Replace invalid percent characters
		$string = preg_replace(&#039;/%(?![A-Fa-f0-9]{2})/&#039;, &#039;%25&#039;, $string);

		// Add unreserved and % to $extra_chars (the latter is safe because all
		// pct-encoded sections are now valid).
		$extra_chars .= &#039;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~%&#039;;

		// Now replace any bytes that aren&#039;t allowed with their pct-encoded versions
		$position = 0;
		$strlen = strlen($string);
		while (($position += strspn($string, $extra_chars, $position)) &lt; $strlen)
		{
			$value = ord($string[$position]);

			// Start position
			$start = $position;

			// By default we are valid
			$valid = true;

			// No one byte sequences are valid due to the while.
			// Two byte sequence:
			if (($value &amp; 0xE0) === 0xC0)
			{
				$character = ($value &amp; 0x1F) &lt;&lt; 6;
				$length = 2;
				$remaining = 1;
			}
			// Three byte sequence:
			elseif (($value &amp; 0xF0) === 0xE0)
			{
				$character = ($value &amp; 0x0F) &lt;&lt; 12;
				$length = 3;
				$remaining = 2;
			}
			// Four byte sequence:
			elseif (($value &amp; 0xF8) === 0xF0)
			{
				$character = ($value &amp; 0x07) &lt;&lt; 18;
				$length = 4;
				$remaining = 3;
			}
			// Invalid byte:
			else
			{
				$valid = false;
				$length = 1;
				$remaining = 0;
			}

			if ($remaining)
			{
				if ($position + $length &lt;= $strlen)
				{
					for ($position++; $remaining; $position++)
					{
						$value = ord($string[$position]);

						// Check that the byte is valid, then add it to the character:
						if (($value &amp; 0xC0) === 0x80)
						{
							$character |= ($value &amp; 0x3F) &lt;&lt; (--$remaining * 6);
						}
						// If it is invalid, count the sequence as invalid and reprocess the current byte:
						else
						{
							$valid = false;
							$position--;
							break;
						}
					}
				}
				else
				{
					$position = $strlen - 1;
					$valid = false;
				}
			}

			// Percent encode anything invalid or not in ucschar
			if (
				// Invalid sequences
				!$valid
				// Non-shortest form sequences are invalid
				|| $length &gt; 1 &amp;&amp; $character &lt;= 0x7F
				|| $length &gt; 2 &amp;&amp; $character &lt;= 0x7FF
				|| $length &gt; 3 &amp;&amp; $character &lt;= 0xFFFF
				// Outside of range of ucschar codepoints
				// Noncharacters
				|| ($character &amp; 0xFFFE) === 0xFFFE
				|| $character &gt;= 0xFDD0 &amp;&amp; $character &lt;= 0xFDEF
				|| (
					// Everything else not in ucschar
					   $character &gt; 0xD7FF &amp;&amp; $character &lt; 0xF900
					|| $character &lt; 0xA0
					|| $character &gt; 0xEFFFD
				)
				&amp;&amp; (
					// Everything not in iprivate, if it applies
					   !$iprivate
					|| $character &lt; 0xE000
					|| $character &gt; 0x10FFFD
				)
			)
			{
				// If we were a character, pretend we weren&#039;t, but rather an error.
				if ($valid)
					$position--;

				for ($j = $start; $j &lt;= $position; $j++)
				{
					$string = substr_replace($string, sprintf(&#039;%%%02X&#039;, ord($string[$j])), $j, 1);
					$j += 2;
					$position += 2;
					$strlen += 2;
				}
			}
		}

		return $string;
	}

	/**
	 * Callback function for preg_replace_callback.
	 *
	 * Removes sequences of percent encoded bytes that represent UTF-8
	 * encoded characters in iunreserved
	 *
	 * @param array $match PCRE match
	 * @return string Replacement
	 */
	protected function remove_iunreserved_percent_encoded($match)
	{
		// As we just have valid percent encoded sequences we can just explode
		// and ignore the first member of the returned array (an empty string).
		$bytes = explode(&#039;%&#039;, $match[0]);

		// Initialize the new string (this is what will be returned) and that
		// there are no bytes remaining in the current sequence (unsurprising
		// at the first byte!).
		$string = &#039;&#039;;
		$remaining = 0;

		// Loop over each and every byte, and set $value to its value
		for ($i = 1, $len = count($bytes); $i &lt; $len; $i++)
		{
			$value = hexdec($bytes[$i]);

			// If we&#039;re the first byte of sequence:
			if (!$remaining)
			{
				// Start position
				$start = $i;

				// By default we are valid
				$valid = true;

				// One byte sequence:
				if ($value &lt;= 0x7F)
				{
					$character = $value;
					$length = 1;
				}
				// Two byte sequence:
				elseif (($value &amp; 0xE0) === 0xC0)
				{
					$character = ($value &amp; 0x1F) &lt;&lt; 6;
					$length = 2;
					$remaining = 1;
				}
				// Three byte sequence:
				elseif (($value &amp; 0xF0) === 0xE0)
				{
					$character = ($value &amp; 0x0F) &lt;&lt; 12;
					$length = 3;
					$remaining = 2;
				}
				// Four byte sequence:
				elseif (($value &amp; 0xF8) === 0xF0)
				{
					$character = ($value &amp; 0x07) &lt;&lt; 18;
					$length = 4;
					$remaining = 3;
				}
				// Invalid byte:
				else
				{
					$valid = false;
					$remaining = 0;
				}
			}
			// Continuation byte:
			else
			{
				// Check that the byte is valid, then add it to the character:
				if (($value &amp; 0xC0) === 0x80)
				{
					$remaining--;
					$character |= ($value &amp; 0x3F) &lt;&lt; ($remaining * 6);
				}
				// If it is invalid, count the sequence as invalid and reprocess the current byte as the start of a sequence:
				else
				{
					$valid = false;
					$remaining = 0;
					$i--;
				}
			}

			// If we&#039;ve reached the end of the current byte sequence, append it to Unicode::$data
			if (!$remaining)
			{
				// Percent encode anything invalid or not in iunreserved
				if (
					// Invalid sequences
					!$valid
					// Non-shortest form sequences are invalid
					|| $length &gt; 1 &amp;&amp; $character &lt;= 0x7F
					|| $length &gt; 2 &amp;&amp; $character &lt;= 0x7FF
					|| $length &gt; 3 &amp;&amp; $character &lt;= 0xFFFF
					// Outside of range of iunreserved codepoints
					|| $character &lt; 0x2D
					|| $character &gt; 0xEFFFD
					// Noncharacters
					|| ($character &amp; 0xFFFE) === 0xFFFE
					|| $character &gt;= 0xFDD0 &amp;&amp; $character &lt;= 0xFDEF
					// Everything else not in iunreserved (this is all BMP)
					|| $character === 0x2F
					|| $character &gt; 0x39 &amp;&amp; $character &lt; 0x41
					|| $character &gt; 0x5A &amp;&amp; $character &lt; 0x61
					|| $character &gt; 0x7A &amp;&amp; $character &lt; 0x7E
					|| $character &gt; 0x7E &amp;&amp; $character &lt; 0xA0
					|| $character &gt; 0xD7FF &amp;&amp; $character &lt; 0xF900
				)
				{
					for ($j = $start; $j &lt;= $i; $j++)
					{
						$string .= &#039;%&#039; . strtoupper($bytes[$j]);
					}
				}
				else
				{
					for ($j = $start; $j &lt;= $i; $j++)
					{
						$string .= chr(hexdec($bytes[$j]));
					}
				}
			}
		}

		// If we have any bytes left over they are invalid (i.e., we are
		// mid-way through a multi-byte sequence)
		if ($remaining)
		{
			for ($j = $start; $j &lt; $len; $j++)
			{
				$string .= &#039;%&#039; . strtoupper($bytes[$j]);
			}
		}

		return $string;
	}

	protected function scheme_normalization()
	{
		if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;iuserinfo&#039;]) &amp;&amp; $this-&gt;iuserinfo === $this-&gt;normalization[$this-&gt;scheme][&#039;iuserinfo&#039;])
		{
			$this-&gt;iuserinfo = null;
		}
		if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;ihost&#039;]) &amp;&amp; $this-&gt;ihost === $this-&gt;normalization[$this-&gt;scheme][&#039;ihost&#039;])
		{
			$this-&gt;ihost = null;
		}
		if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;port&#039;]) &amp;&amp; $this-&gt;port === $this-&gt;normalization[$this-&gt;scheme][&#039;port&#039;])
		{
			$this-&gt;port = null;
		}
		if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;]) &amp;&amp; $this-&gt;ipath === $this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;])
		{
			$this-&gt;ipath = &#039;&#039;;
		}
		if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;iquery&#039;]) &amp;&amp; $this-&gt;iquery === $this-&gt;normalization[$this-&gt;scheme][&#039;iquery&#039;])
		{
			$this-&gt;iquery = null;
		}
		if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;ifragment&#039;]) &amp;&amp; $this-&gt;ifragment === $this-&gt;normalization[$this-&gt;scheme][&#039;ifragment&#039;])
		{
			$this-&gt;ifragment = null;
		}
	}

	/**
	 * Check if the object represents a valid IRI. This needs to be done on each
	 * call as some things change depending on another part of the IRI.
	 *
	 * @return bool
	 */
	public function is_valid()
	{
		if ($this-&gt;ipath === &#039;&#039;) return true;

		$isauthority = $this-&gt;iuserinfo !== null || $this-&gt;ihost !== null ||
			$this-&gt;port !== null;
		if ($isauthority &amp;&amp; $this-&gt;ipath[0] === &#039;/&#039;) return true;

		if (!$isauthority &amp;&amp; (substr($this-&gt;ipath, 0, 2) === &#039;//&#039;)) return false;

		// Relative urls cannot have a colon in the first path segment (and the
		// slashes themselves are not included so skip the first character).
		if (!$this-&gt;scheme &amp;&amp; !$isauthority &amp;&amp;
		    strpos($this-&gt;ipath, &#039;:&#039;) !== false &amp;&amp;
		    strpos($this-&gt;ipath, &#039;/&#039;, 1) !== false &amp;&amp;
		    strpos($this-&gt;ipath, &#039;:&#039;) &lt; strpos($this-&gt;ipath, &#039;/&#039;, 1)) return false;

		return true;
	}

	/**
	 * Set the entire IRI. Returns true on success, false on failure (if there
	 * are any invalid characters).
	 *
	 * @param string $iri
	 * @return bool
	 */
	public function set_iri($iri, $clear_cache = false)
	{
		static $cache;
		if ($clear_cache)
		{
			$cache = null;
			return;
		}
		if (!$cache)
		{
			$cache = array();
		}

		if ($iri === null)
		{
			return true;
		}
		elseif (isset($cache[$iri]))
		{
			list($this-&gt;scheme,
				 $this-&gt;iuserinfo,
				 $this-&gt;ihost,
				 $this-&gt;port,
				 $this-&gt;ipath,
				 $this-&gt;iquery,
				 $this-&gt;ifragment,
				 $return) = $cache[$iri];
			return $return;
		}

		$parsed = $this-&gt;parse_iri((string) $iri);
		if (!$parsed)
		{
			return false;
		}

		$return = $this-&gt;set_scheme($parsed[&#039;scheme&#039;])
			&amp;&amp; $this-&gt;set_authority($parsed[&#039;authority&#039;])
			&amp;&amp; $this-&gt;set_path($parsed[&#039;path&#039;])
			&amp;&amp; $this-&gt;set_query($parsed[&#039;query&#039;])
			&amp;&amp; $this-&gt;set_fragment($parsed[&#039;fragment&#039;]);

		$cache[$iri] = array($this-&gt;scheme,
							 $this-&gt;iuserinfo,
							 $this-&gt;ihost,
							 $this-&gt;port,
							 $this-&gt;ipath,
							 $this-&gt;iquery,
							 $this-&gt;ifragment,
							 $return);
		return $return;
	}

	/**
	 * Set the scheme. Returns true on success, false on failure (if there are
	 * any invalid characters).
	 *
	 * @param string $scheme
	 * @return bool
	 */
	public function set_scheme($scheme)
	{
		if ($scheme === null)
		{
			$this-&gt;scheme = null;
		}
		elseif (!preg_match(&#039;/^[A-Za-z][0-9A-Za-z+\-.]*$/&#039;, $scheme))
		{
			$this-&gt;scheme = null;
			return false;
		}
		else
		{
			$this-&gt;scheme = strtolower($scheme);
		}
		return true;
	}

	/**
	 * Set the authority. Returns true on success, false on failure (if there are
	 * any invalid characters).
	 *
	 * @param string $authority
	 * @return bool
	 */
	public function set_authority($authority, $clear_cache = false)
	{
		static $cache;
		if ($clear_cache)
		{
			$cache = null;
			return;
		}
		if (!$cache)
			$cache = array();

		if ($authority === null)
		{
			$this-&gt;iuserinfo = null;
			$this-&gt;ihost = null;
			$this-&gt;port = null;
			return true;
		}
		elseif (isset($cache[$authority]))
		{
			list($this-&gt;iuserinfo,
				 $this-&gt;ihost,
				 $this-&gt;port,
				 $return) = $cache[$authority];

			return $return;
		}

		$remaining = $authority;
		if (($iuserinfo_end = strrpos($remaining, &#039;@&#039;)) !== false)
		{
			$iuserinfo = substr($remaining, 0, $iuserinfo_end);
			$remaining = substr($remaining, $iuserinfo_end + 1);
		}
		else
		{
			$iuserinfo = null;
		}
		if (($port_start = strpos($remaining, &#039;:&#039;, strpos($remaining, &#039;]&#039;))) !== false)
		{
			if (($port = substr($remaining, $port_start + 1)) === false)
			{
				$port = null;
			}
			$remaining = substr($remaining, 0, $port_start);
		}
		else
		{
			$port = null;
		}

		$return = $this-&gt;set_userinfo($iuserinfo) &amp;&amp;
				  $this-&gt;set_host($remaining) &amp;&amp;
				  $this-&gt;set_port($port);

		$cache[$authority] = array($this-&gt;iuserinfo,
								   $this-&gt;ihost,
								   $this-&gt;port,
								   $return);

		return $return;
	}

	/**
	 * Set the iuserinfo.
	 *
	 * @param string $iuserinfo
	 * @return bool
	 */
	public function set_userinfo($iuserinfo)
	{
		if ($iuserinfo === null)
		{
			$this-&gt;iuserinfo = null;
		}
		else
		{
			$this-&gt;iuserinfo = $this-&gt;replace_invalid_with_pct_encoding($iuserinfo, &#039;!$&amp;\&#039;()*+,;=:&#039;);
			$this-&gt;scheme_normalization();
		}

		return true;
	}

	/**
	 * Set the ihost. Returns true on success, false on failure (if there are
	 * any invalid characters).
	 *
	 * @param string $ihost
	 * @return bool
	 */
	public function set_host($ihost)
	{
		if ($ihost === null)
		{
			$this-&gt;ihost = null;
			return true;
		}
		elseif (substr($ihost, 0, 1) === &#039;[&#039; &amp;&amp; substr($ihost, -1) === &#039;]&#039;)
		{
			if (SimplePie_Net_IPv6::check_ipv6(substr($ihost, 1, -1)))
			{
				$this-&gt;ihost = &#039;[&#039; . SimplePie_Net_IPv6::compress(substr($ihost, 1, -1)) . &#039;]&#039;;
			}
			else
			{
				$this-&gt;ihost = null;
				return false;
			}
		}
		else
		{
			$ihost = $this-&gt;replace_invalid_with_pct_encoding($ihost, &#039;!$&amp;\&#039;()*+,;=&#039;);

			// Lowercase, but ignore pct-encoded sections (as they should
			// remain uppercase). This must be done after the previous step
			// as that can add unescaped characters.
			$position = 0;
			$strlen = strlen($ihost);
			while (($position += strcspn($ihost, &#039;ABCDEFGHIJKLMNOPQRSTUVWXYZ%&#039;, $position)) &lt; $strlen)
			{
				if ($ihost[$position] === &#039;%&#039;)
				{
					$position += 3;
				}
				else
				{
					$ihost[$position] = strtolower($ihost[$position]);
					$position++;
				}
			}

			$this-&gt;ihost = $ihost;
		}

		$this-&gt;scheme_normalization();

		return true;
	}

	/**
	 * Set the port. Returns true on success, false on failure (if there are
	 * any invalid characters).
	 *
	 * @param string $port
	 * @return bool
	 */
	public function set_port($port)
	{
		if ($port === null)
		{
			$this-&gt;port = null;
			return true;
		}
		elseif (strspn($port, &#039;0123456789&#039;) === strlen($port))
		{
			$this-&gt;port = (int) $port;
			$this-&gt;scheme_normalization();
			return true;
		}

		$this-&gt;port = null;
		return false;
	}

	/**
	 * Set the ipath.
	 *
	 * @param string $ipath
	 * @return bool
	 */
	public function set_path($ipath, $clear_cache = false)
	{
		static $cache;
		if ($clear_cache)
		{
			$cache = null;
			return;
		}
		if (!$cache)
		{
			$cache = array();
		}

		$ipath = (string) $ipath;

		if (isset($cache[$ipath]))
		{
			$this-&gt;ipath = $cache[$ipath][(int) ($this-&gt;scheme !== null)];
		}
		else
		{
			$valid = $this-&gt;replace_invalid_with_pct_encoding($ipath, &#039;!$&amp;\&#039;()*+,;=@:/&#039;);
			$removed = $this-&gt;remove_dot_segments($valid);

			$cache[$ipath] = array($valid, $removed);
			$this-&gt;ipath =  ($this-&gt;scheme !== null) ? $removed : $valid;
		}

		$this-&gt;scheme_normalization();
		return true;
	}

	/**
	 * Set the iquery.
	 *
	 * @param string $iquery
	 * @return bool
	 */
	public function set_query($iquery)
	{
		if ($iquery === null)
		{
			$this-&gt;iquery = null;
		}
		else
		{
			$this-&gt;iquery = $this-&gt;replace_invalid_with_pct_encoding($iquery, &#039;!$&amp;\&#039;()*+,;=:@/?&#039;, true);
			$this-&gt;scheme_normalization();
		}
		return true;
	}

	/**
	 * Set the ifragment.
	 *
	 * @param string $ifragment
	 * @return bool
	 */
	public function set_fragment($ifragment)
	{
		if ($ifragment === null)
		{
			$this-&gt;ifragment = null;
		}
		else
		{
			$this-&gt;ifragment = $this-&gt;replace_invalid_with_pct_encoding($ifragment, &#039;!$&amp;\&#039;()*+,;=:@/?&#039;);
			$this-&gt;scheme_normalization();
		}
		return true;
	}

	/**
	 * Convert an IRI to a URI (or parts thereof)
	 *
	 * @return string
	 */
	public function to_uri($string)
	{
		static $non_ascii;
		if (!$non_ascii)
		{
			$non_ascii = implode(&#039;&#039;, range(&quot;\x80&quot;, &quot;\xFF&quot;));
		}

		$position = 0;
		$strlen = strlen($string);
		while (($position += strcspn($string, $non_ascii, $position)) &lt; $strlen)
		{
			$string = substr_replace($string, sprintf(&#039;%%%02X&#039;, ord($string[$position])), $position, 1);
			$position += 3;
			$strlen += 2;
		}

		return $string;
	}

	/**
	 * Get the complete IRI
	 *
	 * @return string
	 */
	public function get_iri()
	{
		if (!$this-&gt;is_valid())
		{
			return false;
		}

		$iri = &#039;&#039;;
		if ($this-&gt;scheme !== null)
		{
			$iri .= $this-&gt;scheme . &#039;:&#039;;
		}
		if (($iauthority = $this-&gt;get_iauthority()) !== null)
		{
			$iri .= &#039;//&#039; . $iauthority;
		}
		if ($this-&gt;ipath !== &#039;&#039;)
		{
			$iri .= $this-&gt;ipath;
		}
        elseif (!empty($this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;]) &amp;&amp; $iauthority !== null &amp;&amp; $iauthority !== &#039;&#039;)
		{
			$iri .= $this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;];
		}
		if ($this-&gt;iquery !== null)
		{
			$iri .= &#039;?&#039; . $this-&gt;iquery;
		}
		if ($this-&gt;ifragment !== null)
		{
			$iri .= &#039;#&#039; . $this-&gt;ifragment;
		}

		return $iri;
	}

	/**
	 * Get the complete URI
	 *
	 * @return string
	 */
	public function get_uri()
	{
		return $this-&gt;to_uri($this-&gt;get_iri());
	}

	/**
	 * Get the complete iauthority
	 *
	 * @return string
	 */
	protected function get_iauthority()
	{
		if ($this-&gt;iuserinfo !== null || $this-&gt;ihost !== null || $this-&gt;port !== null)
		{
			$iauthority = &#039;&#039;;
			if ($this-&gt;iuserinfo !== null)
			{
				$iauthority .= $this-&gt;iuserinfo . &#039;@&#039;;
			}
			if ($this-&gt;ihost !== null)
			{
				$iauthority .= $this-&gt;ihost;
			}
            if ($this-&gt;port !== null &amp;&amp; $this-&gt;port !== 0)
			{
				$iauthority .= &#039;:&#039; . $this-&gt;port;
			}
			return $iauthority;
		}

		return null;
	}

	/**
	 * Get the complete authority
	 *
	 * @return string
	 */
	protected function get_authority()
	{
		$iauthority = $this-&gt;get_iauthority();
		if (is_string($iauthority))
			return $this-&gt;to_uri($iauthority);

		return $iauthority;
	}
}
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