<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]> and Trevor Rowbotham <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Polyfill\Intl\Idn;
use Exception;
use Normalizer;
use Symfony\Polyfill\Intl\Idn\Resources\unidata\DisallowedRanges;
use Symfony\Polyfill\Intl\Idn\Resources\unidata\Regex;
/**
* @see https://www.unicode.org/reports/tr46/
*
* @internal
*/
final class Idn
{
public const ERROR_EMPTY_LABEL = 1;
public const ERROR_LABEL_TOO_LONG = 2;
public const ERROR_DOMAIN_NAME_TOO_LONG = 4;
public const ERROR_LEADING_HYPHEN = 8;
public const ERROR_TRAILING_HYPHEN = 0x10;
public const ERROR_HYPHEN_3_4 = 0x20;
public const ERROR_LEADING_COMBINING_MARK = 0x40;
public const ERROR_DISALLOWED = 0x80;
public const ERROR_PUNYCODE = 0x100;
public const ERROR_LABEL_HAS_DOT = 0x200;
public const ERROR_INVALID_ACE_LABEL = 0x400;
public const ERROR_BIDI = 0x800;
public const ERROR_CONTEXTJ = 0x1000;
public const ERROR_CONTEXTO_PUNCTUATION = 0x2000;
public const ERROR_CONTEXTO_DIGITS = 0x4000;
public const INTL_IDNA_VARIANT_2003 = 0;
public const INTL_IDNA_VARIANT_UTS46 = 1;
public const IDNA_DEFAULT = 0;
public const IDNA_ALLOW_UNASSIGNED = 1;
public const IDNA_USE_STD3_RULES = 2;
public const IDNA_CHECK_BIDI = 4;
public const IDNA_CHECK_CONTEXTJ = 8;
public const IDNA_NONTRANSITIONAL_TO_ASCII = 16;
public const IDNA_NONTRANSITIONAL_TO_UNICODE = 32;
public const MAX_DOMAIN_SIZE = 253;
public const MAX_LABEL_SIZE = 63;
public const BASE = 36;
public const TMIN = 1;
public const TMAX = 26;
public const SKEW = 38;
public const DAMP = 700;
public const INITIAL_BIAS = 72;
public const INITIAL_N = 128;
public const DELIMITER = '-';
public const MAX_INT = 2147483647;
/**
* Contains the numeric value of a basic code point (for use in representing integers) in the
* range 0 to BASE-1, or -1 if b is does not represent a value.
*
* @var array<int, int>
*/
private static $basicToDigit = [
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
];
/**
* @var array<int, int>
*/
private static $virama;
/**
* @var array<int, string>
*/
private static $mapped;
/**
* @var array<int, bool>
*/
private static $ignored;
/**
* @var array<int, string>
*/
private static $deviation;
/**
* @var array<int, bool>
*/
private static $disallowed;
/**
* @var array<int, string>
*/
private static $disallowed_STD3_mapped;
/**
* @var array<int, bool>
*/
private static $disallowed_STD3_valid;
/**
* @var bool
*/
private static $mappingTableLoaded = false;
/**
* @see https://www.unicode.org/reports/tr46/#ToASCII
*
* @param string $domainName
* @param int $options
* @param int $variant
* @param array $idna_info
*
* @return string|false
*/
public static function idn_to_ascii($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = [])
{
if (\PHP_VERSION_ID >= 70200 && self::INTL_IDNA_VARIANT_2003 === $variant) {
@trigger_error('idn_to_ascii(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED);
}
$options = [
'CheckHyphens' => true,
'CheckBidi' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 !== ($options & self::IDNA_CHECK_BIDI),
'CheckJoiners' => self::INTL_IDNA_VARIANT_UTS46 === $variant && 0 !== ($options & self::IDNA_CHECK_CONTEXTJ),
'UseSTD3ASCIIRules' => 0 !== ($options & self::IDNA_USE_STD3_RULES),
'Transitional_Processing' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 === ($options & self::IDNA_NONTRANSITIONAL_TO_ASCII),
'VerifyDnsLength' => true,
];
$info = new Info();
$labels = self::process((string) $domainName, $options, $info);
foreach ($labels as $i => $label) {
// Only convert labels to punycode that contain non-ASCII code points
if (1 === preg_match('/[^\x00-\x7F]/', $label)) {
try {
$label = 'xn--'.self::punycodeEncode($label);
} catch (Exception $e) {
$info->errors |= self::ERROR_PUNYCODE;
}
$labels[$i] = $label;
}
}
if ($options['VerifyDnsLength']) {
self::validateDomainAndLabelLength($labels, $info);
}
$idna_info = [
'result' => implode('.', $labels),
'isTransitionalDifferent' => $info->transitionalDifferent,
'errors' => $info->errors,
];
return 0 === $info->errors ? $idna_info['result'] : false;
}
/**
* @see https://www.unicode.org/reports/tr46/#ToUnicode
*
* @param string $domainName
* @param int $options
* @param int $variant
* @param array $idna_info
*
* @return string|false
*/
public static function idn_to_utf8($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = [])
{
if (\PHP_VERSION_ID >= 70200 && self::INTL_IDNA_VARIANT_2003 === $variant) {
@trigger_error('idn_to_utf8(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED);
}
$info = new Info();
$labels = self::process((string) $domainName, [
'CheckHyphens' => true,
'CheckBidi' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 !== ($options & self::IDNA_CHECK_BIDI),
'CheckJoiners' => self::INTL_IDNA_VARIANT_UTS46 === $variant && 0 !== ($options & self::IDNA_CHECK_CONTEXTJ),
'UseSTD3ASCIIRules' => 0 !== ($options & self::IDNA_USE_STD3_RULES),
'Transitional_Processing' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 === ($options & self::IDNA_NONTRANSITIONAL_TO_UNICODE),
], $info);
$idna_info = [
'result' => implode('.', $labels),
'isTransitionalDifferent' => $info->transitionalDifferent,
'errors' => $info->errors,
];
return 0 === $info->errors ? $idna_info['result'] : false;
}
/**
* @param string $label
*
* @return bool
*/
private static function isValidContextJ(array $codePoints, $label)
{
if (!isset(self::$virama)) {
self::$virama = require __DIR__.\DIRECTORY_SEPARATOR.'Resources'.\DIRECTORY_SEPARATOR.'unidata'.\DIRECTORY_SEPARATOR.'virama.php';
}
$offset = 0;
foreach ($codePoints as $i => $codePoint) {
if (0x200C !== $codePoint && 0x200D !== $codePoint) {
continue;
}
if (!isset($codePoints[$i - 1])) {
return false;
}
// If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
if (isset(self::$virama[$codePoints[$i - 1]])) {
continue;
}
// If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C(Joining_Type:T)*(Joining_Type:{R,D})) Then
// True;
// Generated RegExp = ([Joining_Type:{L,D}][Joining_Type:T]*\u200C[Joining_Type:T]*)[Joining_Type:{R,D}]
if (0x200C === $codePoint && 1 === preg_match(Regex::ZWNJ, $label, $matches, \PREG_OFFSET_CAPTURE, $offset)) {
$offset += \strlen($matches[1][0]);
continue;
}
return false;
}
return true;
}
/**
* @see https://www.unicode.org/reports/tr46/#ProcessingStepMap
*
* @param string $input
* @param array<string, bool> $options
*
* @return string
*/
private static function mapCodePoints($input, array $options, Info $info)
{
$str = '';
$useSTD3ASCIIRules = $options['UseSTD3ASCIIRules'];
$transitional = $options['Transitional_Processing'];
foreach (self::utf8Decode($input) as $codePoint) {
$data = self::lookupCodePointStatus($codePoint, $useSTD3ASCIIRules);
switch ($data['status']) {
case 'disallowed':
$info->errors |= self::ERROR_DISALLOWED;
// no break.
case 'valid':
$str .= mb_chr($codePoint, 'utf-8');
break;
case 'ignored':
// Do nothing.
break;
case 'mapped':
$str .= $data['mapping'];
break;
case 'deviation':
$info->transitionalDifferent = true;
$str .= ($transitional ? $data['mapping'] : mb_chr($codePoint, 'utf-8'));
break;
}
}
return $str;
}
/**
* @see https://www.unicode.org/reports/tr46/#Processing
*
* @param string $domain
* @param array<string, bool> $options
*
* @return array<int, string>
*/
private static function process($domain, array $options, Info $info)
{
// If VerifyDnsLength is not set, we are doing ToUnicode otherwise we are doing ToASCII and
// we need to respect the VerifyDnsLength option.
$checkForEmptyLabels = !isset($options['VerifyDnsLength']) || $options['VerifyDnsLength'];
if ($checkForEmptyLabels && '' === $domain) {
$info->errors |= self::ERROR_EMPTY_LABEL;
return [$domain];
}
// Step 1. Map each code point in the domain name string
$domain = self::mapCodePoints($domain, $options, $info);
// Step 2. Normalize the domain name string to Unicode Normalization Form C.
if (!Normalizer::isNormalized($domain, Normalizer::FORM_C)) {
$domain = Normalizer::normalize($domain, Normalizer::FORM_C);
}
// Step 3. Break the string into labels at U+002E (.) FULL STOP.
$labels = explode('.', $domain);
$lastLabelIndex = \count($labels) - 1;
// Step 4. Convert and validate each label in the domain name string.
foreach ($labels as $i => $label) {
$validationOptions = $options;
if ('xn--' === substr($label, 0, 4)) {
try {
$label = self::punycodeDecode(substr($label, 4));
} catch (Exception $e) {
$info->errors |= self::ERROR_PUNYCODE;
continue;
}
$validationOptions['Transitional_Processing'] = false;
$labels[$i] = $label;
}
self::validateLabel($label, $info, $validationOptions, $i > 0 && $i === $lastLabelIndex);
}
if ($info->bidiDomain && !$info->validBidiDomain) {
$info->errors |= self::ERROR_BIDI;
}
// Any input domain name string that does not record an error has been successfully
// processed according to this specification. Conversely, if an input domain_name string
// causes an error, then the processing of the input domain_name string fails. Determining
// what to do with error input is up to the caller, and not in the scope of this document.
return $labels;
}
/**
* @see https://tools.ietf.org/html/rfc5893#section-2
*
* @param string $label
*/
private static function validateBidiLabel($label, Info $info)
{
if (1 === preg_match(Regex::RTL_LABEL, $label)) {
$info->bidiDomain = true;
// Step 1. The first character must be a character with Bidi property L, R, or AL.
// If it has the R or AL property, it is an RTL label
if (1 !== preg_match(Regex::BIDI_STEP_1_RTL, $label)) {
$info->validBidiDomain = false;
return;
}
// Step 2. In an RTL label, only characters with the Bidi properties R, AL, AN, EN, ES,
// CS, ET, ON, BN, or NSM are allowed.
if (1 === preg_match(Regex::BIDI_STEP_2, $label)) {
$info->validBidiDomain = false;
return;
}
// Step 3. In an RTL label, the end of the label must be a character with Bidi property
// R, AL, EN, or AN, followed by zero or more characters with Bidi property NSM.
if (1 !== preg_match(Regex::BIDI_STEP_3, $label)) {
$info->validBidiDomain = false;
return;
}
// Step 4. In an RTL label, if an EN is present, no AN may be present, and vice versa.
if (1 === preg_match(Regex::BIDI_STEP_4_AN, $label) && 1 === preg_match(Regex::BIDI_STEP_4_EN, $label)) {
$info->validBidiDomain = false;
return;
}
return;
}
// We are a LTR label
// Step 1. The first character must be a character with Bidi property L, R, or AL.
// If it has the L property, it is an LTR label.
if (1 !== preg_match(Regex::BIDI_STEP_1_LTR, $label)) {
$info->validBidiDomain = false;
return;
}
// Step 5. In an LTR label, only characters with the Bidi properties L, EN,
// ES, CS, ET, ON, BN, or NSM are allowed.
if (1 === preg_match(Regex::BIDI_STEP_5, $label)) {
$info->validBidiDomain = false;
return;
}
// Step 6.In an LTR label, the end of the label must be a character with Bidi property L or
// EN, followed by zero or more characters with Bidi property NSM.
if (1 !== preg_match(Regex::BIDI_STEP_6, $label)) {
$info->validBidiDomain = false;
return;
}
}
/**
* @param array<int, string> $labels
*/
private static function validateDomainAndLabelLength(array $labels, Info $info)
{
$maxDomainSize = self::MAX_DOMAIN_SIZE;
$length = \count($labels);
// Number of "." delimiters.
$domainLength = $length - 1;
// If the last label is empty and it is not the first label, then it is the root label.
// Increase the max size by 1, making it 254, to account for the root label's "."
// delimiter. This also means we don't need to check the last label's length for being too
// long.
if ($length > 1 && '' === $labels[$length - 1]) {
++$maxDomainSize;
--$length;
}
for ($i = 0; $i < $length; ++$i) {
$bytes = \strlen($labels[$i]);
$domainLength += $bytes;
if ($bytes > self::MAX_LABEL_SIZE) {
$info->errors |= self::ERROR_LABEL_TOO_LONG;
}
}
if ($domainLength > $maxDomainSize) {
$info->errors |= self::ERROR_DOMAIN_NAME_TOO_LONG;
}
}
/**
* @see https://www.unicode.org/reports/tr46/#Validity_Criteria
*
* @param string $label
* @param array<string, bool> $options
* @param bool $canBeEmpty
*/
private static function validateLabel($label, Info $info, array $options, $canBeEmpty)
{
if ('' === $label) {
if (!$canBeEmpty && (!isset($options['VerifyDnsLength']) || $options['VerifyDnsLength'])) {
$info->errors |= self::ERROR_EMPTY_LABEL;
}
return;
}
// Step 1. The label must be in Unicode Normalization Form C.
if (!Normalizer::isNormalized($label, Normalizer::FORM_C)) {
$info->errors |= self::ERROR_INVALID_ACE_LABEL;
}
$codePoints = self::utf8Decode($label);
if ($options['CheckHyphens']) {
// Step 2. If CheckHyphens, the label must not contain a U+002D HYPHEN-MINUS character
// in both the thrid and fourth positions.
if (isset($codePoints[2], $codePoints[3]) && 0x002D === $codePoints[2] && 0x002D === $codePoints[3]) {
$info->errors |= self::ERROR_HYPHEN_3_4;
}
// Step 3. If CheckHyphens, the label must neither begin nor end with a U+002D
// HYPHEN-MINUS character.
if ('-' === substr($label, 0, 1)) {
$info->errors |= self::ERROR_LEADING_HYPHEN;
}
if ('-' === substr($label, -1, 1)) {
$info->errors |= self::ERROR_TRAILING_HYPHEN;
}
}
// Step 4. The label must not contain a U+002E (.) FULL STOP.
if (false !== strpos($label, '.')) {
$info->errors |= self::ERROR_LABEL_HAS_DOT;
}
// Step 5. The label must not begin with a combining mark, that is: General_Category=Mark.
if (1 === preg_match(Regex::COMBINING_MARK, $label)) {
$info->errors |= self::ERROR_LEADING_COMBINING_MARK;
}
// Step 6. Each code point in the label must only have certain status values according to
// Section 5, IDNA Mapping Table:
$transitional = $options['Transitional_Processing'];
$useSTD3ASCIIRules = $options['UseSTD3ASCIIRules'];
foreach ($codePoints as $codePoint) {
$data = self::lookupCodePointStatus($codePoint, $useSTD3ASCIIRules);
$status = $data['status'];
if ('valid' === $status || (!$transitional && 'deviation' === $status)) {
continue;
}
$info->errors |= self::ERROR_DISALLOWED;
break;
}
// Step 7. If CheckJoiners, the label must satisify the ContextJ rules from Appendix A, in
// The Unicode Code Points and Internationalized Domain Names for Applications (IDNA)
// [IDNA2008].
if ($options['CheckJoiners'] && !self::isValidContextJ($codePoints, $label)) {
$info->errors |= self::ERROR_CONTEXTJ;
}
// Step 8. If CheckBidi, and if the domain name is a Bidi domain name, then the label must
// satisfy all six of the numbered conditions in [IDNA2008] RFC 5893, Section 2.
if ($options['CheckBidi'] && (!$info->bidiDomain || $info->validBidiDomain)) {
self::validateBidiLabel($label, $info);
}
}
/**
* @see https://tools.ietf.org/html/rfc3492#section-6.2
*
* @param string $input
*
* @return string
*/
private static function punycodeDecode($input)
{
$n = self::INITIAL_N;
$out = 0;
$i = 0;
$bias = self::INITIAL_BIAS;
$lastDelimIndex = strrpos($input, self::DELIMITER);
$b = false === $lastDelimIndex ? 0 : $lastDelimIndex;
$inputLength = \strlen($input);
$output = [];
$bytes = array_map('ord', str_split($input));
for ($j = 0; $j < $b; ++$j) {
if ($bytes[$j] > 0x7F) {
throw new Exception('Invalid input');
}
$output[$out++] = $input[$j];
}
if ($b > 0) {
++$b;
}
for ($in = $b; $in < $inputLength; ++$out) {
$oldi = $i;
$w = 1;
for ($k = self::BASE; /* no condition */; $k += self::BASE) {
if ($in >= $inputLength) {
throw new Exception('Invalid input');
}
$digit = self::$basicToDigit[$bytes[$in++] & 0xFF];
if ($digit < 0) {
throw new Exception('Invalid input');
}
if ($digit > intdiv(self::MAX_INT - $i, $w)) {
throw new Exception('Integer overflow');
}
$i += $digit * $w;
if ($k <= $bias) {
$t = self::TMIN;
} elseif ($k >= $bias + self::TMAX) {
$t = self::TMAX;
} else {
$t = $k - $bias;
}
if ($digit < $t) {
break;
}
$baseMinusT = self::BASE - $t;
if ($w > intdiv(self::MAX_INT, $baseMinusT)) {
throw new Exception('Integer overflow');
}
$w *= $baseMinusT;
}
$outPlusOne = $out + 1;
$bias = self::adaptBias($i - $oldi, $outPlusOne, 0 === $oldi);
if (intdiv($i, $outPlusOne) > self::MAX_INT - $n) {
throw new Exception('Integer overflow');
}
$n += intdiv($i, $outPlusOne);
$i %= $outPlusOne;
array_splice($output, $i++, 0, [mb_chr($n, 'utf-8')]);
}
return implode('', $output);
}
/**
* @see https://tools.ietf.org/html/rfc3492#section-6.3
*
* @param string $input
*
* @return string
*/
private static function punycodeEncode($input)
{
$n = self::INITIAL_N;
$delta = 0;
$out = 0;
$bias = self::INITIAL_BIAS;
$inputLength = 0;
$output = '';
$iter = self::utf8Decode($input);
foreach ($iter as $codePoint) {
++$inputLength;
if ($codePoint < 0x80) {
$output .= \chr($codePoint);
++$out;
}
}
$h = $out;
$b = $out;
if ($b > 0) {
$output .= self::DELIMITER;
++$out;
}
while ($h < $inputLength) {
$m = self::MAX_INT;
foreach ($iter as $codePoint) {
if ($codePoint >= $n && $codePoint < $m) {
$m = $codePoint;
}
}
if ($m - $n > intdiv(self::MAX_INT - $delta, $h + 1)) {
throw new Exception('Integer overflow');
}
$delta += ($m - $n) * ($h + 1);
$n = $m;
foreach ($iter as $codePoint) {
if ($codePoint < $n && 0 === ++$delta) {
throw new Exception('Integer overflow');
}
if ($codePoint === $n) {
$q = $delta;
for ($k = self::BASE; /* no condition */; $k += self::BASE) {
if ($k <= $bias) {
$t = self::TMIN;
} elseif ($k >= $bias + self::TMAX) {
$t = self::TMAX;
} else {
$t = $k - $bias;
}
if ($q < $t) {
break;
}
$qMinusT = $q - $t;
$baseMinusT = self::BASE - $t;
$output .= self::encodeDigit($t + ($qMinusT) % ($baseMinusT), false);
++$out;
$q = intdiv($qMinusT, $baseMinusT);
}
$output .= self::encodeDigit($q, false);
++$out;
$bias = self::adaptBias($delta, $h + 1, $h === $b);
$delta = 0;
++$h;
}
}
++$delta;
++$n;
}
return $output;
}
/**
* @see https://tools.ietf.org/html/rfc3492#section-6.1
*
* @param int $delta
* @param int $numPoints
* @param bool $firstTime
*
* @return int
*/
private static function adaptBias($delta, $numPoints, $firstTime)
{
// xxx >> 1 is a faster way of doing intdiv(xxx, 2)
$delta = $firstTime ? intdiv($delta, self::DAMP) : $delta >> 1;
$delta += intdiv($delta, $numPoints);
$k = 0;
while ($delta > ((self::BASE - self::TMIN) * self::TMAX) >> 1) {
$delta = intdiv($delta, self::BASE - self::TMIN);
$k += self::BASE;
}
return $k + intdiv((self::BASE - self::TMIN + 1) * $delta, $delta + self::SKEW);
}
/**
* @param int $d
* @param bool $flag
*
* @return string
*/
private static function encodeDigit($d, $flag)
{
return \chr($d + 22 + 75 * ($d < 26 ? 1 : 0) - (($flag ? 1 : 0) << 5));
}
/**
* Takes a UTF-8 encoded string and converts it into a series of integer code points. Any
* invalid byte sequences will be replaced by a U+FFFD replacement code point.
*
* @see https://encoding.spec.whatwg.org/#utf-8-decoder
*
* @param string $input
*
* @return array<int, int>
*/
private static function utf8Decode($input)
{
$bytesSeen = 0;
$bytesNeeded = 0;
$lowerBoundary = 0x80;
$upperBoundary = 0xBF;
$codePoint = 0;
$codePoints = [];
$length = \strlen($input);
for ($i = 0; $i < $length; ++$i) {
$byte = \ord($input[$i]);
if (0 === $bytesNeeded) {
if ($byte >= 0x00 && $byte <= 0x7F) {
$codePoints[] = $byte;
continue;
}
if ($byte >= 0xC2 && $byte <= 0xDF) {
$bytesNeeded = 1;
$codePoint = $byte & 0x1F;
} elseif ($byte >= 0xE0 && $byte <= 0xEF) {
if (0xE0 === $byte) {
$lowerBoundary = 0xA0;
} elseif (0xED === $byte) {
$upperBoundary = 0x9F;
}
$bytesNeeded = 2;
$codePoint = $byte & 0xF;
} elseif ($byte >= 0xF0 && $byte <= 0xF4) {
if (0xF0 === $byte) {
$lowerBoundary = 0x90;
} elseif (0xF4 === $byte) {
$upperBoundary = 0x8F;
}
$bytesNeeded = 3;
$codePoint = $byte & 0x7;
} else {
$codePoints[] = 0xFFFD;
}
continue;
}
if ($byte < $lowerBoundary || $byte > $upperBoundary) {
$codePoint = 0;
$bytesNeeded = 0;
$bytesSeen = 0;
$lowerBoundary = 0x80;
$upperBoundary = 0xBF;
--$i;
$codePoints[] = 0xFFFD;
continue;
}
$lowerBoundary = 0x80;
$upperBoundary = 0xBF;
$codePoint = ($codePoint << 6) | ($byte & 0x3F);
if (++$bytesSeen !== $bytesNeeded) {
continue;
}
$codePoints[] = $codePoint;
$codePoint = 0;
$bytesNeeded = 0;
$bytesSeen = 0;
}
// String unexpectedly ended, so append a U+FFFD code point.
if (0 !== $bytesNeeded) {
$codePoints[] = 0xFFFD;
}
return $codePoints;
}
/**
* @param int $codePoint
* @param bool $useSTD3ASCIIRules
*
* @return array{status: string, mapping?: string}
*/
private static function lookupCodePointStatus($codePoint, $useSTD3ASCIIRules)
{
if (!self::$mappingTableLoaded) {
self::$mappingTableLoaded = true;
self::$mapped = require __DIR__.'/Resources/unidata/mapped.php';
self::$ignored = require __DIR__.'/Resources/unidata/ignored.php';
self::$deviation = require __DIR__.'/Resources/unidata/deviation.php';
self::$disallowed = require __DIR__.'/Resources/unidata/disallowed.php';
self::$disallowed_STD3_mapped = require __DIR__.'/Resources/unidata/disallowed_STD3_mapped.php';
self::$disallowed_STD3_valid = require __DIR__.'/Resources/unidata/disallowed_STD3_valid.php';
}
if (isset(self::$mapped[$codePoint])) {
return ['status' => 'mapped', 'mapping' => self::$mapped[$codePoint]];
}
if (isset(self::$ignored[$codePoint])) {
return ['status' => 'ignored'];
}
if (isset(self::$deviation[$codePoint])) {
return ['status' => 'deviation', 'mapping' => self::$deviation[$codePoint]];
}
if (isset(self::$disallowed[$codePoint]) || DisallowedRanges::inRange($codePoint)) {
return ['status' => 'disallowed'];
}
$isDisallowedMapped = isset(self::$disallowed_STD3_mapped[$codePoint]);
if ($isDisallowedMapped || isset(self::$disallowed_STD3_valid[$codePoint])) {
$status = 'disallowed';
if (!$useSTD3ASCIIRules) {
$status = $isDisallowedMapped ? 'mapped' : 'valid';
}
if ($isDisallowedMapped) {
return ['status' => $status, 'mapping' => self::$disallowed_STD3_mapped[$codePoint]];
}
return ['status' => $status];
}
return ['status' => 'valid'];
}
}