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Edit File : IRI.php \| Size : 33.99 KB
<?php // SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue // SPDX-FileCopyrightText: 2008 Steve Minutillo // SPDX-License-Identifier: BSD-3-Clause declare(strict_types=1); namespace SimplePie; /** * IRI parser/serialiser/normaliser * * @property ?string $scheme * @property ?string $userinfo * @property ?string $host * @property ?int $port * @property-write int\|string\|null $port * @property ?string $authority * @property string $path * @property ?string $query * @property ?string $fragment / class IRI { /* * Scheme * * @var ?string / protected $scheme = null; /* * User Information * * @var ?string / protected $iuserinfo = null; /* * ihost * * @var ?string / protected $ihost = null; /* * Port * * @var ?int / protected $port = null; /* * ipath * * @var string / protected $ipath = ''; /* * 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. * * @var array<string, array<string, mixed>> / protected $normalization = [ 'acap' => [ 'port' => 674 ], 'dict' => [ 'port' => 2628 ], 'file' => [ 'ihost' => 'localhost' ], 'http' => [ 'port' => 80, 'ipath' => '/' ], 'https' => [ 'port' => 443, 'ipath' => '/' ], ]; /* * Return the entire IRI when you try and read the object as a string * * @return string / public function __toString() { return (string) $this->get_iri(); } /* * Overload __set() to provide access via properties * * @param string $name Property name * @param mixed $value Property value * @return void / public function __set(string $name, $value) { $callable = [$this, 'set_' . $name]; if (is_callable($callable)) { call_user_func($callable, $value); } elseif ( $name === 'iauthority' \|\| $name === 'iuserinfo' \|\| $name === 'ihost' \|\| $name === 'ipath' \|\| $name === 'iquery' \|\| $name === 'ifragment' ) { call_user_func([$this, 'set_' . substr($name, 1)], $value); } } /* * Overload __get() to provide access via properties * * @param string $name Property name * @return mixed / public function __get(string $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' ) { $return = $this->{"get_$name"}(); } elseif (array_key_exists($name, $props)) { $return = $this->$name; } // host -> ihost elseif (array_key_exists($prop = 'i' . $name, $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->scheme, $this->normalization[$this->scheme][$name])) { return $this->normalization[$this->scheme][$name]; } return $return; } /* * Overload __isset() to provide access via properties * * @param string $name Property name * @return bool / public function __isset(string $name) { return method_exists($this, 'get_' . $name) \|\| isset($this->$name); } /* * Overload __unset() to provide access via properties * * @param string $name Property name * @return void / public function __unset(string $name) { $callable = [$this, 'set_' . $name]; if (is_callable($callable)) { call_user_func($callable, ''); } } /* * Create a new IRI object, from a specified string * * @param string\|null $iri / public function __construct(?string $iri = null) { $this->set_iri($iri); } /* * Clean up * @return void / public function __destruct() { $this->set_iri(null, true); $this->set_path(null, true); $this->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 IRI)) { $relative = new IRI($relative); } if (!$relative->is_valid()) { return false; } elseif ($relative->scheme !== null) { return clone $relative; } else { if (!($base instanceof IRI)) { $base = new IRI($base); } if ($base->scheme !== null && $base->is_valid()) { if ($relative->get_iri() !== '') { if ($relative->iuserinfo !== null \|\| $relative->ihost !== null \|\| $relative->port !== null) { $target = clone $relative; $target->scheme = $base->scheme; } else { $target = new IRI(); $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; } return false; } } /* * Parse an IRI into scheme/authority/path/query/fragment segments * * @param string $iri * @return array{ * scheme: string\|null, * authority: string\|null, * path: string, * query: string\|null, * fragment: string\|null, * }\|false / protected function parse_iri(string $iri) { $iri = trim($iri, "\x20\x09\x0A\x0C\x0D"); if (preg_match('/^(?:(?P<scheme>[^:\/?#]+):)?(:?\/\/(?P<authority>[^\/?#]))?(?P<path>[^?#])(?:\?(?P<query>[^#]))?(?:#(?P<fragment>.))?$/', $iri, $match, \PREG_UNMATCHED_AS_NULL)) { // TODO: Remove once we require PHP ≥ 7.4. $match['query'] = $match['query'] ?? null; $match['fragment'] = $match['fragment'] ?? 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(string $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, '', intval(strrpos($output, '/'))); } elseif ($input === '/..') { $input = '/'; $output = substr_replace($output, '', intval(strrpos($output, '/'))); } // D: if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise, elseif ($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; } /* * 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 $string, string $extra_chars, bool $iprivate = false) { // Normalize as many pct-encoded sections as possible $string = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', [$this, 'remove_iunreserved_percent_encoded'], $string); \assert(\is_string($string), "For PHPStan: Should not occur, the regex is valid"); // Replace invalid percent characters $string = preg_replace('/%(?![A-Fa-f0-9]{2})/', '%25', $string); \assert(\is_string($string), "For PHPStan: Should not occur, the regex is valid"); // 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; $strlen = strlen($string); while (($position += strspn($string, $extra_chars, $position)) < $strlen) { $value = ord($string[$position]); $character = 0; // 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++) { $value = ord($string[$position]); // Check that the byte is valid, then add it to the character: if (($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++) { $string = substr_replace($string, sprintf('%%%02X', 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{string} $match PCRE match, a capture group #0 consisting of a sequence of valid percent-encoded bytes * @return string Replacement / protected function remove_iunreserved_percent_encoded(array $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('%', $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; // these variables will be initialized in the loop but PHPStan is not able to detect it currently $start = 0; $character = 0; $length = 0; $valid = true; // 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++) { // Cast for PHPStan, this will always be a number between 0 and 0xFF so hexdec will return int. $string .= chr((int) hexdec($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 $string; } /** * @return void / protected function scheme_normalization() { if ($this->scheme === null) { return; } 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->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']) { $this->ifragment = null; } } /* * Check if the object represents a valid IRI. This needs to be done on each * call as some things change depending on another part of the IRI. * * @return bool / public function is_valid() { if ($this->ipath === '') { return true; } $isauthority = $this->iuserinfo !== null \|\| $this->ihost !== null \|\| $this->port !== null; if ($isauthority && $this->ipath[0] === '/') { return true; } if (!$isauthority && (substr($this->ipath, 0, 2) === '//')) { return false; } // Relative urls cannot have a colon in the first path segment (and the // slashes themselves are not included so skip the first character). if (!$this->scheme && !$isauthority && strpos($this->ipath, ':') !== false && strpos($this->ipath, '/', 1) !== false && strpos($this->ipath, ':') < strpos($this->ipath, '/', 1)) { return false; } return true; } /* * Set the entire IRI. Returns true on success, false on failure (if there * are any invalid characters). * * @param string\|null $iri * @return bool / public function set_iri(?string $iri, bool $clear_cache = false) { static $cache; if ($clear_cache) { $cache = null; return false; } if (!$cache) { $cache = []; } if ($iri === null) { return true; } elseif (isset($cache[$iri])) { [ $this->scheme, $this->iuserinfo, $this->ihost, $this->port, $this->ipath, $this->iquery, $this->ifragment, $return ] = $cache[$iri]; return $return; } $parsed = $this->parse_iri((string) $iri); if (!$parsed) { return false; } $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] = [ $this->scheme, $this->iuserinfo, $this->ihost, $this->port, $this->ipath, $this->iquery, $this->ifragment, $return ]; return $return; } /* * Set the scheme. Returns true on success, false on failure (if there are * any invalid characters). * * @param string\|null $scheme * @return bool / public function set_scheme(?string $scheme) { if ($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; } /** * Set the authority. Returns true on success, false on failure (if there are * any invalid characters). * * @param string\|null $authority * @return bool / public function set_authority(?string $authority, bool $clear_cache = false) { static $cache; if ($clear_cache) { $cache = null; return false; } if (!$cache) { $cache = []; } if ($authority === null) { $this->iuserinfo = null; $this->ihost = null; $this->port = null; return true; } elseif (isset($cache[$authority])) { [ $this->iuserinfo, $this->ihost, $this->port, $return ] = $cache[$authority]; return $return; } $remaining = $authority; if (($iuserinfo_end = strrpos($remaining, '@')) !== false) { // Cast for PHPStan on PHP < 8.0. It does not detect that // the range is not flipped so substr cannot return false. $iuserinfo = (string) substr($remaining, 0, $iuserinfo_end); $remaining = substr($remaining, $iuserinfo_end + 1); } else { $iuserinfo = null; } if (($port_start = strpos($remaining, ':', intval(strpos($remaining, ']')))) !== false) { $port = substr($remaining, $port_start + 1); if ($port === false) { $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] = [ $this->iuserinfo, $this->ihost, $this->port, $return ]; return $return; } /* * Set the iuserinfo. * * @param string\|null $iuserinfo * @return bool / public function set_userinfo(?string $iuserinfo) { if ($iuserinfo === null) { $this->iuserinfo = null; } else { $this->iuserinfo = $this->replace_invalid_with_pct_encoding($iuserinfo, '!$&\'()+,;=:'); $this->scheme_normalization(); } return true; } /** * Set the ihost. Returns true on success, false on failure (if there are * any invalid characters). * * @param string\|null $ihost * @return bool / public function set_host(?string $ihost) { if ($ihost === null) { $this->ihost = null; return true; } elseif (substr($ihost, 0, 1) === '[' && substr($ihost, -1) === ']') { if (\SimplePie\Net\IPv6::check_ipv6(substr($ihost, 1, -1))) { $this->ihost = '[' . \SimplePie\Net\IPv6::compress(substr($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; } /** * Set the port. Returns true on success, false on failure (if there are * any invalid characters). * * @param string\|int\|null $port * @return bool / public function set_port($port) { if ($port === null) { $this->port = null; return true; } elseif (strspn((string) $port, '0123456789') === strlen((string) $port)) { $this->port = (int) $port; $this->scheme_normalization(); return true; } $this->port = null; return false; } /* * Set the ipath. * * @param string\|null $ipath * @return bool / public function set_path(?string $ipath, bool $clear_cache = false) { static $cache; if ($clear_cache) { $cache = null; return false; } if (!$cache) { $cache = []; } $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] = [$valid, $removed]; $this->ipath = ($this->scheme !== null) ? $removed : $valid; } $this->scheme_normalization(); return true; } /** * Set the iquery. * * @param string\|null $iquery * @return bool / public function set_query(?string $iquery) { if ($iquery === null) { $this->iquery = null; } else { $this->iquery = $this->replace_invalid_with_pct_encoding($iquery, '!$&\'()+,;=:@/?', true); $this->scheme_normalization(); } return true; } /** * Set the ifragment. * * @param string\|null $ifragment * @return bool / public function set_fragment(?string $ifragment) { if ($ifragment === null) { $this->ifragment = null; } else { $this->ifragment = $this->replace_invalid_with_pct_encoding($ifragment, '!$&\'()+,;=:@/?'); $this->scheme_normalization(); } return true; } /** * Convert an IRI to a URI (or parts thereof) * * @param string $string * @return string / public function to_uri(string $string) { static $non_ascii; if (!$non_ascii) { $non_ascii = implode('', range("\x80", "\xFF")); } $position = 0; $strlen = strlen($string); while (($position += strcspn($string, $non_ascii, $position)) < $strlen) { $string = substr_replace($string, sprintf('%%%02X', ord($string[$position])), $position, 1); $position += 3; $strlen += 2; } return $string; } /* * Get the complete IRI * * @return string\|false / public function get_iri() { if (!$this->is_valid()) { return false; } $iri = ''; if ($this->scheme !== null) { $iri .= $this->scheme . ':'; } if (($iauthority = $this->get_iauthority()) !== null) { $iri .= '//' . $iauthority; } if ($this->ipath !== '') { $iri .= $this->ipath; } elseif (!empty($this->normalization[$this->scheme]['ipath']) && $iauthority !== null && $iauthority !== '') { $iri .= $this->normalization[$this->scheme]['ipath']; } if ($this->iquery !== null) { $iri .= '?' . $this->iquery; } if ($this->ifragment !== null) { $iri .= '#' . $this->ifragment; } return $iri; } /* * Get the complete URI * * @return string / public function get_uri() { return $this->to_uri((string) $this->get_iri()); } /* * Get the complete iauthority * * @return ?string / protected function get_iauthority() { if ($this->iuserinfo !== null \|\| $this->ihost !== null \|\| $this->port !== null) { $iauthority = ''; if ($this->iuserinfo !== null) { $iauthority .= $this->iuserinfo . '@'; } if ($this->ihost !== null) { $iauthority .= $this->ihost; } if ($this->port !== null && $this->port !== 0) { $iauthority .= ':' . $this->port; } return $iauthority; } return null; } /* * Get the complete authority * * @return ?string */ protected function get_authority() { $iauthority = $this->get_iauthority(); if (is_string($iauthority)) { return $this->to_uri($iauthority); } return $iauthority; } } class_alias('SimplePie\IRI', 'SimplePie_IRI'); Back

Edit File : IRI.php | Size : 33.99 KB

<?php

// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-FileCopyrightText: 2008 Steve Minutillo
// SPDX-License-Identifier: BSD-3-Clause

declare(strict_types=1);

namespace SimplePie;

/**
 * IRI parser/serialiser/normaliser
 *
 * @property ?string $scheme
 * @property ?string $userinfo
 * @property ?string $host
 * @property ?int $port
 * @property-write int|string|null $port
 * @property ?string $authority
 * @property string $path
 * @property ?string $query
 * @property ?string $fragment
 */
class IRI
{
    /**
     * Scheme
     *
     * @var ?string
     */
    protected $scheme = null;

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

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

/**
     * Port
     *
     * @var ?int
     */
    protected $port = null;

/**
     * ipath
     *
     * @var string
     */
    protected $ipath = '';

/**
     * 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.
     *
     * @var array<string, array<string, mixed>>
     */
    protected $normalization = [
        'acap' => [
            'port' => 674
        ],
        'dict' => [
            'port' => 2628
        ],
        'file' => [
            'ihost' => 'localhost'
        ],
        'http' => [
            'port' => 80,
            'ipath' => '/'
        ],
        'https' => [
            'port' => 443,
            'ipath' => '/'
        ],
    ];

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

/**
     * Overload __set() to provide access via properties
     *
     * @param string $name Property name
     * @param mixed $value Property value
     * @return void
     */
    public function __set(string $name, $value)
    {
        $callable = [$this, 'set_' . $name];
        if (is_callable($callable)) {
            call_user_func($callable, $value);
        } elseif (
            $name === 'iauthority'
            || $name === 'iuserinfo'
            || $name === 'ihost'
            || $name === 'ipath'
            || $name === 'iquery'
            || $name === 'ifragment'
        ) {
            call_user_func([$this, 'set_' . substr($name, 1)], $value);
        }
    }

/**
     * Overload __get() to provide access via properties
     *
     * @param string $name Property name
     * @return mixed
     */
    public function __get(string $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'
        ) {
            $return = $this->{"get_$name"}();
        } elseif (array_key_exists($name, $props)) {
            $return = $this->$name;
        }
        // host -> ihost
        elseif (array_key_exists($prop = 'i' . $name, $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->scheme, $this->normalization[$this->scheme][$name])) {
            return $this->normalization[$this->scheme][$name];
        }

return $return;
    }

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

/**
     * Overload __unset() to provide access via properties
     *
     * @param string $name Property name
     * @return void
     */
    public function __unset(string $name)
    {
        $callable = [$this, 'set_' . $name];
        if (is_callable($callable)) {
            call_user_func($callable, '');
        }
    }

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

/**
     * Clean up
     * @return void
     */
    public function __destruct()
    {
        $this->set_iri(null, true);
        $this->set_path(null, true);
        $this->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 IRI)) {
            $relative = new IRI($relative);
        }
        if (!$relative->is_valid()) {
            return false;
        } elseif ($relative->scheme !== null) {
            return clone $relative;
        } else {
            if (!($base instanceof IRI)) {
                $base = new IRI($base);
            }
            if ($base->scheme !== null && $base->is_valid()) {
                if ($relative->get_iri() !== '') {
                    if ($relative->iuserinfo !== null || $relative->ihost !== null || $relative->port !== null) {
                        $target = clone $relative;
                        $target->scheme = $base->scheme;
                    } else {
                        $target = new IRI();
                        $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;
            }

return false;
        }
    }

/**
     * Parse an IRI into scheme/authority/path/query/fragment segments
     *
     * @param string $iri
     * @return array{
     *   scheme: string|null,
     *   authority: string|null,
     *   path: string,
     *   query: string|null,
     *   fragment: string|null,
     * }|false
     */
    protected function parse_iri(string $iri)
    {
        $iri = trim($iri, "\x20\x09\x0A\x0C\x0D");
        if (preg_match('/^(?:(?P<scheme>[^:\/?#]+):)?(:?\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(?:\?(?P<query>[^#]*))?(?:#(?P<fragment>.*))?$/', $iri, $match, \PREG_UNMATCHED_AS_NULL)) {
            // TODO: Remove once we require PHP ≥ 7.4.
            $match['query'] = $match['query'] ?? null;
            $match['fragment'] = $match['fragment'] ?? 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(string $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, '', intval(strrpos($output, '/')));
            } elseif ($input === '/..') {
                $input = '/';
                $output = substr_replace($output, '', intval(strrpos($output, '/')));
            }
            // D: if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise,
            elseif ($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;
    }

/**
     * 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 $string, string $extra_chars, bool $iprivate = false)
    {
        // Normalize as many pct-encoded sections as possible
        $string = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', [$this, 'remove_iunreserved_percent_encoded'], $string);
        \assert(\is_string($string), "For PHPStan: Should not occur, the regex is valid");

// Replace invalid percent characters
        $string = preg_replace('/%(?![A-Fa-f0-9]{2})/', '%25', $string);
        \assert(\is_string($string), "For PHPStan: Should not occur, the regex is valid");

// 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;
        $strlen = strlen($string);
        while (($position += strspn($string, $extra_chars, $position)) < $strlen) {
            $value = ord($string[$position]);
            $character = 0;

// 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++) {
                        $value = ord($string[$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++) {
                    $string = substr_replace($string, sprintf('%%%02X', 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{string} $match PCRE match, a capture group #0 consisting of a sequence of valid percent-encoded bytes
     * @return string Replacement
     */
    protected function remove_iunreserved_percent_encoded(array $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('%', $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;

// these variables will be initialized in the loop but PHPStan is not able to detect it currently
        $start = 0;
        $character = 0;
        $length = 0;
        $valid = true;

// 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++) {
                        // Cast for PHPStan, this will always be a number between 0 and 0xFF so hexdec will return int.
                        $string .= chr((int) hexdec($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;
    }

/**
     * @return void
     */
    protected function scheme_normalization()
    {
        if ($this->scheme === null) {
            return;
        }

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->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;
        }
    }

/**
     * 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->ipath === '') {
            return true;
        }

$isauthority = $this->iuserinfo !== null || $this->ihost !== null ||
            $this->port !== null;
        if ($isauthority && $this->ipath[0] === '/') {
            return true;
        }

if (!$isauthority && (substr($this->ipath, 0, 2) === '//')) {
            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 (!$this->scheme && !$isauthority &&
            strpos($this->ipath, ':') !== false &&
            strpos($this->ipath, '/', 1) !== false &&
            strpos($this->ipath, ':') < strpos($this->ipath, '/', 1)) {
            return false;
        }

return true;
    }

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

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

return $return;
        }

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

$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] = [
            $this->scheme,
            $this->iuserinfo,
            $this->ihost,
            $this->port,
            $this->ipath,
            $this->iquery,
            $this->ifragment,
            $return
        ];

return $return;
    }

/**
     * Set the scheme. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string|null $scheme
     * @return bool
     */
    public function set_scheme(?string $scheme)
    {
        if ($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;
    }

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

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

return $return;
        }

$remaining = $authority;
        if (($iuserinfo_end = strrpos($remaining, '@')) !== false) {
            // Cast for PHPStan on PHP < 8.0. It does not detect that
            // the range is not flipped so substr cannot return false.
            $iuserinfo = (string) substr($remaining, 0, $iuserinfo_end);
            $remaining = substr($remaining, $iuserinfo_end + 1);
        } else {
            $iuserinfo = null;
        }
        if (($port_start = strpos($remaining, ':', intval(strpos($remaining, ']')))) !== false) {
            $port = substr($remaining, $port_start + 1);
            if ($port === false) {
                $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] = [
            $this->iuserinfo,
            $this->ihost,
            $this->port,
            $return
        ];

return $return;
    }

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

return true;
    }

/**
     * Set the ihost. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string|null $ihost
     * @return bool
     */
    public function set_host(?string $ihost)
    {
        if ($ihost === null) {
            $this->ihost = null;
            return true;
        } elseif (substr($ihost, 0, 1) === '[' && substr($ihost, -1) === ']') {
            if (\SimplePie\Net\IPv6::check_ipv6(substr($ihost, 1, -1))) {
                $this->ihost = '[' . \SimplePie\Net\IPv6::compress(substr($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;
    }

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

$this->port = null;
        return false;
    }

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

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

$this->scheme_normalization();
        return true;
    }

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

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

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

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

return $string;
    }

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

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

return $iri;
    }

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

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

return null;
    }

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

return $iauthority;
    }
}

class_alias('SimplePie\IRI', 'SimplePie_IRI');

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