/**

protected $scheme = null;

/**

protected $iuserinfo = null;

/**

protected $ihost = null;

/**

protected $port = null;

/**

protected $ipath = '';

/**

protected $iquery = null;

/**

protected $ifragment = null;

/**

protected $normalization = array(

'acap' => array(

'port' => Port::ACAP,

),

'dict' => array(

'port' => Port::DICT,

),

'file' => array(

'ihost' => 'localhost',

),

'http' => array(

'port' => Port::HTTP,

),

'https' => array(

'port' => Port::HTTPS,

),

);

/**

public function __toString() {

return $this->get_iri();

}

/**

public function __set($name, $value) {

if (method_exists($this, 'set_' . $name)) {

call_user_func(array($this, 'set_' . $name), $value);

}

elseif (

$name === 'iauthority'

|| $name === 'iuserinfo'

|| $name === 'ihost'

|| $name === 'ipath'

|| $name === 'iquery'

|| $name === 'ifragment'

) {

call_user_func(array($this, 'set_' . substr($name, 1)), $value);

}

}

/**

public function __get($name) {

// isset() returns false for null, we don't want to do that

// Also why we use array_key_exists below instead of isset()

$props = get_object_vars($this);

if (

$name === 'iri' ||

$name === 'uri' ||

$name === 'iauthority' ||

$name === 'authority'

) {

$method = 'get_' . $name;

$return = $this->$method();

}

elseif (array_key_exists($name, $props)) {

$return = $this->$name;

}

// host -> ihost

elseif (($prop = 'i' . $name) && array_key_exists($prop, $props)) {

$name = $prop;

$return = $this->$prop;

}

// ischeme -> scheme

elseif (($prop = substr($name, 1)) && array_key_exists($prop, $props)) {

$name = $prop;

$return = $this->$prop;

}

else {

trigger_error('Undefined property: ' . get_class($this) . '::' . $name, E_USER_NOTICE);

$return = null;

}

if ($return === null && isset($this->normalization[$this->scheme][$name])) {

return $this->normalization[$this->scheme][$name];

}

else {

return $return;

}

}

/**

public function __isset($name) {

return (method_exists($this, 'get_' . $name) || isset($this->$name));

}

/**

public function __unset($name) {

if (method_exists($this, 'set_' . $name)) {

call_user_func(array($this, 'set_' . $name), '');

}

}

/**

public function __construct($iri = null) {

if ($iri !== null && InputValidator::is_string_or_stringable($iri) === false) {

throw InvalidArgument::create(1, '$iri', 'string|Stringable|null', gettype($iri));

}

$this->set_iri($iri);

}

/**

public static function absolutize($base, $relative) {

if (!($relative instanceof self)) {

$relative = new self($relative);

}

if (!$relative->is_valid()) {

return false;

}

elseif ($relative->scheme !== null) {

return clone $relative;

}

if (!($base instanceof self)) {

$base = new self($base);

}

if ($base->scheme === null || !$base->is_valid()) {

return false;

}

if ($relative->get_iri() !== '') {

if ($relative->iuserinfo !== null || $relative->ihost !== null || $relative->port !== null) {

$target = clone $relative;

$target->scheme = $base->scheme;

}

else {

$target = new self;

$target->scheme = $base->scheme;

$target->iuserinfo = $base->iuserinfo;

$target->ihost = $base->ihost;

$target->port = $base->port;

if ($relative->ipath !== '') {

if ($relative->ipath[0] === '/') {

$target->ipath = $relative->ipath;

}

elseif (($base->iuserinfo !== null || $base->ihost !== null || $base->port !== null) && $base->ipath === '') {

$target->ipath = '/' . $relative->ipath;

}

elseif (($last_segment = strrpos($base->ipath, '/')) !== false) {

$target->ipath = substr($base->ipath, 0, $last_segment + 1) . $relative->ipath;

}

else {

$target->ipath = $relative->ipath;

}

$target->ipath = $target->remove_dot_segments($target->ipath);

$target->iquery = $relative->iquery;

}

else {

$target->ipath = $base->ipath;

if ($relative->iquery !== null) {

$target->iquery = $relative->iquery;

}

elseif ($base->iquery !== null) {

$target->iquery = $base->iquery;

}

}

$target->ifragment = $relative->ifragment;

}

}

else {

$target = clone $base;

$target->ifragment = null;

}

$target->scheme_normalization();

return $target;

}

/**

protected function parse_iri($iri) {

$iri = trim($iri, "\x20\x09\x0A\x0C\x0D");

$has_match = preg_match('/^((?P<scheme>[^:\/?#]+):)?(\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(\?(?P<query>[^#]*))?(#(?P<fragment>.*))?$/', $iri, $match);

if (!$has_match) {

throw new Exception('Cannot parse supplied IRI', 'iri.cannot_parse', $iri);

}

if ($match[1] === '') {

$match['scheme'] = null;

}

if (!isset($match[3]) || $match[3] === '') {

$match['authority'] = null;

}

if (!isset($match[5])) {

$match['path'] = '';

}

if (!isset($match[6]) || $match[6] === '') {

$match['query'] = null;

}

if (!isset($match[8]) || $match[8] === '') {

$match['fragment'] = null;

}

return $match;

}

/**

protected function remove_dot_segments($input) {

$output = '';

while (strpos($input, './') !== false || strpos($input, '/.') !== false || $input === '.' || $input === '..') {

// A: If the input buffer begins with a prefix of "../" or "./",

// then remove that prefix from the input buffer; otherwise,

if (strpos($input, '../') === 0) {

$input = substr($input, 3);

}

elseif (strpos($input, './') === 0) {

$input = substr($input, 2);

}

// B: if the input buffer begins with a prefix of "/./" or "/.",

// where "." is a complete path segment, then replace that prefix

// with "/" in the input buffer; otherwise,

elseif (strpos($input, '/./') === 0) {

$input = substr($input, 2);

}

elseif ($input === '/.') {

$input = '/';

}

// C: if the input buffer begins with a prefix of "/../" or "/..",

// where ".." is a complete path segment, then replace that prefix

// with "/" in the input buffer and remove the last segment and its

// preceding "/" (if any) from the output buffer; otherwise,

elseif (strpos($input, '/../') === 0) {

$input = substr($input, 3);

$output = substr_replace($output, '', (strrpos($output, '/') ?: 0));

}

elseif ($input === '/..') {

$input = '/';

$output = substr_replace($output, '', (strrpos($output, '/') ?: 0));

}

// D: if the input buffer consists only of "." or "..", then remove

// that from the input buffer; otherwise,

elseif ($input === '.' || $input === '..') {

$input = '';

}

// E: move the first path segment in the input buffer to the end of

// the output buffer, including the initial "/" character (if any)

// and any subsequent characters up to, but not including, the next

// "/" character or the end of the input buffer

elseif (($pos = strpos($input, '/', 1)) !== false) {

$output .= substr($input, 0, $pos);

$input = substr_replace($input, '', 0, $pos);

}

else {

$output .= $input;

$input = '';

}

}

return $output . $input;

}

/**

protected function replace_invalid_with_pct_encoding($text, $extra_chars, $iprivate = false) {

// Normalize as many pct-encoded sections as possible

$text = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', array($this, 'remove_iunreserved_percent_encoded'), $text);

// Replace invalid percent characters

$text = preg_replace('/%(?![A-Fa-f0-9]{2})/', '%25', $text);

// Add unreserved and % to $extra_chars (the latter is safe because all

// pct-encoded sections are now valid).

$extra_chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~%';

// Now replace any bytes that aren't allowed with their pct-encoded versions

$position = 0;

$strlen = strlen($text);

while (($position += strspn($text, $extra_chars, $position)) < $strlen) {

$value = ord($text[$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 & 0xE0) === 0xC0) {

$character = ($value & 0x1F) << 6;

$length = 2;

$remaining = 1;

}

// Three byte sequence:

elseif (($value & 0xF0) === 0xE0) {

$character = ($value & 0x0F) << 12;

$length = 3;

$remaining = 2;

}

// Four byte sequence:

elseif (($value & 0xF8) === 0xF0) {

$character = ($value & 0x07) << 18;

$length = 4;

$remaining = 3;

}

// Invalid byte:

else {

$valid = false;

$length = 1;

$remaining = 0;

}

if ($remaining) {

if ($position + $length <= $strlen) {

for ($position++; $remaining; $position++) {

$value = ord($text[$position]);

// Check that the byte is valid, then add it to the character:

if (($value & 0xC0) === 0x80) {

$character |= ($value & 0x3F) << (--$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 > 1 && $character <= 0x7F

|| $length > 2 && $character <= 0x7FF

|| $length > 3 && $character <= 0xFFFF

// Outside of range of ucschar codepoints

// Noncharacters

|| ($character & 0xFFFE) === 0xFFFE

|| $character >= 0xFDD0 && $character <= 0xFDEF

|| (

// Everything else not in ucschar

$character > 0xD7FF && $character < 0xF900

|| $character < 0xA0

|| $character > 0xEFFFD

)

&& (

// Everything not in iprivate, if it applies

!$iprivate

|| $character < 0xE000

|| $character > 0x10FFFD

)

) {

// If we were a character, pretend we weren't, but rather an error.

if ($valid) {

$position--;

}

for ($j = $start; $j <= $position; $j++) {

$text = substr_replace($text, sprintf('%%%02X', ord($text[$j])), $j, 1);

$j += 2;

$position += 2;

$strlen += 2;

}

}

}

return $text;

}

/**

protected function remove_iunreserved_percent_encoded($regex_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('%', $regex_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 = '';

$remaining = 0;

// Loop over each and every byte, and set $value to its value

for ($i = 1, $len = count($bytes); $i < $len; $i++) {

$value = hexdec($bytes[$i]);

// If we're the first byte of sequence:

if (!$remaining) {

// Start position

$start = $i;

// By default we are valid

$valid = true;

// One byte sequence:

if ($value <= 0x7F) {

$character = $value;

$length = 1;

}

// Two byte sequence:

elseif (($value & 0xE0) === 0xC0) {

$character = ($value & 0x1F) << 6;

$length = 2;

$remaining = 1;

}

// Three byte sequence:

elseif (($value & 0xF0) === 0xE0) {

$character = ($value & 0x0F) << 12;

$length = 3;

$remaining = 2;

}

// Four byte sequence:

elseif (($value & 0xF8) === 0xF0) {

$character = ($value & 0x07) << 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 & 0xC0) === 0x80) {

$remaining--;

$character |= ($value & 0x3F) << ($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'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 > 1 && $character <= 0x7F

|| $length > 2 && $character <= 0x7FF

|| $length > 3 && $character <= 0xFFFF

// Outside of range of iunreserved codepoints

|| $character < 0x2D

|| $character > 0xEFFFD

// Noncharacters

|| ($character & 0xFFFE) === 0xFFFE

|| $character >= 0xFDD0 && $character <= 0xFDEF

// Everything else not in iunreserved (this is all BMP)

|| $character === 0x2F

|| $character > 0x39 && $character < 0x41

|| $character > 0x5A && $character < 0x61

|| $character > 0x7A && $character < 0x7E

|| $character > 0x7E && $character < 0xA0

|| $character > 0xD7FF && $character < 0xF900

) {

for ($j = $start; $j <= $i; $j++) {

$string .= '%' . strtoupper($bytes[$j]);

}

}

else {

for ($j = $start; $j <= $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 < $len; $j++) {

$string .= '%' . strtoupper($bytes[$j]);

}

}

return $string;

}

protected function scheme_normalization() {

if (isset($this->normalization[$this->scheme]['iuserinfo']) && $this->iuserinfo === $this->normalization[$this->scheme]['iuserinfo']) {

$this->iuserinfo = null;

}

if (isset($this->normalization[$this->scheme]['ihost']) && $this->ihost === $this->normalization[$this->scheme]['ihost']) {

$this->ihost = null;

}

if (isset($this->normalization[$this->scheme]['port']) && $this->port === $this->normalization[$this->scheme]['port']) {

$this->port = null;

}

if (isset($this->normalization[$this->scheme]['ipath']) && $this->ipath === $this->normalization[$this->scheme]['ipath']) {

$this->ipath = '';

}

if (isset($this->ihost) && empty($this->ipath)) {

$this->ipath = '/';

}

if (isset($this->normalization[$this->scheme]['iquery']) && $this->iquery === $this->normalization[$this->scheme]['iquery']) {

$this->iquery = null;

}

if (isset($this->normalization[$this->scheme]['ifragment']) && $this->ifragment === $this->normalization[$this->scheme]['ifragment']) {

$this->ifragment = null;

}

}

/**

public function is_valid() {

$isauthority = $this->iuserinfo !== null || $this->ihost !== null || $this->port !== null;

if ($this->ipath !== '' &&

(

$isauthority && $this->ipath[0] !== '/' ||

(

$this->scheme === null &&

!$isauthority &&

strpos($this->ipath, ':') !== false &&

(strpos($this->ipath, '/') === false ? true : strpos($this->ipath, ':') < strpos($this->ipath, '/'))

)

)

) {

return false;

}

return true;

}

/**

protected function set_iri($iri) {

static $cache;

if (!$cache) {

$cache = array();

}

if ($iri === null) {

return true;

}

$iri = (string) $iri;

if (isset($cache[$iri])) {

list($this->scheme,

$this->iuserinfo,

$this->ihost,

$this->port,

$this->ipath,

$this->iquery,

$this->ifragment,

$return) = $cache[$iri];

return $return;

}

$parsed = $this->parse_iri($iri);

$return = $this->set_scheme($parsed['scheme'])

&& $this->set_authority($parsed['authority'])

&& $this->set_path($parsed['path'])

&& $this->set_query($parsed['query'])

&& $this->set_fragment($parsed['fragment']);

$cache[$iri] = array($this->scheme,

$this->iuserinfo,

$this->ihost,

$this->port,

$this->ipath,

$this->iquery,

$this->ifragment,

$return);

return $return;

}

/**

protected function set_scheme($scheme) {

if ($scheme === null) {

$this->scheme = null;

}

elseif (!preg_match('/^[A-Za-z][0-9A-Za-z+\-.]*$/', $scheme)) {

$this->scheme = null;

return false;

}

else {

$this->scheme = strtolower($scheme);

}

return true;

}

/**

protected function set_authority($authority) {

static $cache;

if (!$cache) {

$cache = array();

}

if ($authority === null) {

$this->iuserinfo = null;

$this->ihost = null;

$this->port = null;

return true;

}

if (isset($cache[$authority])) {

list($this->iuserinfo,

$this->ihost,

$this->port,

$return) = $cache[$authority];

return $return;

}

$remaining = $authority;

if (($iuserinfo_end = strrpos($remaining, '@')) !== false) {

$iuserinfo = substr($remaining, 0, $iuserinfo_end);

$remaining = substr($remaining, $iuserinfo_end + 1);

}

else {

$iuserinfo = null;

}

if (($port_start = strpos($remaining, ':', (strpos($remaining, ']') ?: 0))) !== false) {

$port = substr($remaining, $port_start + 1);

if ($port === false || $port === '') {

$port = null;

}

$remaining = substr($remaining, 0, $port_start);

}

else {

$port = null;

}

$return = $this->set_userinfo($iuserinfo) &&

$this->set_host($remaining) &&

$this->set_port($port);

$cache[$authority] = array($this->iuserinfo,

$this->ihost,

$this->port,

$return);

return $return;

}

/**

protected function set_userinfo($iuserinfo) {

if ($iuserinfo === null) {

$this->iuserinfo = null;

}

else {

$this->iuserinfo = $this->replace_invalid_with_pct_encoding($iuserinfo, '!$&\'()*+,;=:');

$this->scheme_normalization();

}

return true;

}

/**

protected function set_host($ihost) {

if ($ihost === null) {

$this->ihost = null;

return true;

}

if (substr($ihost, 0, 1) === '[' && substr($ihost, -1) === ']') {

if (Ipv6::check_ipv6(substr($ihost, 1, -1))) {

$this->ihost = '[' . Ipv6::compress(substr($ihost, 1, -1)) . ']';

}

else {

$this->ihost = null;

return false;

}

}

else {

$ihost = $this->replace_invalid_with_pct_encoding($ihost, '!$&\'()*+,;=');

// 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, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ%', $position)) < $strlen) {

if ($ihost[$position] === '%') {

$position += 3;

}

else {

$ihost[$position] = strtolower($ihost[$position]);

$position++;

}

}

$this->ihost = $ihost;

}

$this->scheme_normalization();

return true;

}

/**

protected function set_port($port) {

if ($port === null) {

$this->port = null;

return true;

}

if (strspn($port, '0123456789') === strlen($port)) {

$this->port = (int) $port;

$this->scheme_normalization();

return true;

}

$this->port = null;

return false;

}

/**

protected function set_path($ipath) {

static $cache;

if (!$cache) {

$cache = array();

}

$ipath = (string) $ipath;

if (isset($cache[$ipath])) {

$this->ipath = $cache[$ipath][(int) ($this->scheme !== null)];

}

else {

$valid = $this->replace_invalid_with_pct_encoding($ipath, '!$&\'()*+,;=@:/');

$removed = $this->remove_dot_segments($valid);

$cache[$ipath] = array($valid, $removed);

$this->ipath = ($this->scheme !== null) ? $removed : $valid;

}

$this->scheme_normalization();

return true;

}

/**

protected function set_query($iquery) {

if ($iquery === null) {

$this->iquery = null;

}

else {

$this->iquery = $this->replace_invalid_with_pct_encoding($iquery, '!$&\'()*+,;=:@/?', true);

$this->scheme_normalization();

}

return true;

}

/**

protected function set_fragment($ifragment) {

if ($ifragment === null) {

$this->ifragment = null;

}

else {

$this->ifragment = $this->replace_invalid_with_pct_encoding($ifragment, '!$&\'()*+,;=:@/?');

$this->scheme_normalization();

}

return true;