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-<?php
-/**
- * Unicode normalization routines
- *
- * Copyright © 2004 Brion Vibber <brion@pobox.com>
- * https://www.mediawiki.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- * http://www.gnu.org/copyleft/gpl.html
- *
- * @file
- * @ingroup UtfNormal
- */
-
-/**
- * @defgroup UtfNormal UtfNormal
- */
-
-define( 'NORMALIZE_ICU', function_exists( 'utf8_normalize' ) );
-define( 'NORMALIZE_INTL', function_exists( 'normalizer_normalize' ) );
-
-/**
- * Unicode normalization routines for working with UTF-8 strings.
- * Currently assumes that input strings are valid UTF-8!
- *
- * Not as fast as I'd like, but should be usable for most purposes.
- * UtfNormal::toNFC() will bail early if given ASCII text or text
- * it can quickly determine is already normalized.
- *
- * All functions can be called static.
- *
- * See description of forms at http://www.unicode.org/reports/tr15/
- *
- * @ingroup UtfNormal
- */
-class UtfNormal {
- /**
- * For using the ICU wrapper
- */
- const UNORM_NONE = 1;
- const UNORM_NFD = 2;
- const UNORM_NFKD = 3;
- const UNORM_NFC = 4;
- const UNORM_NFKC = 5;
- const UNORM_FCD = 6;
- const UNORM_DEFAULT = self::UNORM_NFC;
-
- public static $utfCombiningClass = null;
- public static $utfCanonicalComp = null;
- public static $utfCanonicalDecomp = null;
-
- # Load compatibility decompositions on demand if they are needed.
- public static $utfCompatibilityDecomp = null;
- public static $utfCheckNFC;
-
- /**
- * The ultimate convenience function! Clean up invalid UTF-8 sequences,
- * and convert to normal form C, canonical composition.
- *
- * Fast return for pure ASCII strings; some lesser optimizations for
- * strings containing only known-good characters. Not as fast as toNFC().
- *
- * @param string $string a UTF-8 string
- * @return string a clean, shiny, normalized UTF-8 string
- */
- static function cleanUp( $string ) {
- if ( NORMALIZE_ICU ) {
- $string = self::replaceForNativeNormalize( $string );
-
- # UnicodeString constructor fails if the string ends with a
- # head byte. Add a junk char at the end, we'll strip it off.
- return rtrim( utf8_normalize( $string . "\x01", self::UNORM_NFC ), "\x01" );
- } elseif ( NORMALIZE_INTL ) {
- $string = self::replaceForNativeNormalize( $string );
- $norm = normalizer_normalize( $string, Normalizer::FORM_C );
- if ( $norm === null || $norm === false ) {
- # normalizer_normalize will either return false or null
- # (depending on which doc you read) if invalid utf8 string.
- # quickIsNFCVerify cleans up invalid sequences.
-
- if ( UtfNormal::quickIsNFCVerify( $string ) ) {
- # if that's true, the string is actually already normal.
- return $string;
- } else {
- # Now we are valid but non-normal
- return normalizer_normalize( $string, Normalizer::FORM_C );
- }
- } else {
- return $norm;
- }
- } elseif ( UtfNormal::quickIsNFCVerify( $string ) ) {
- # Side effect -- $string has had UTF-8 errors cleaned up.
- return $string;
- } else {
- return UtfNormal::NFC( $string );
- }
- }
-
- /**
- * Convert a UTF-8 string to normal form C, canonical composition.
- * Fast return for pure ASCII strings; some lesser optimizations for
- * strings containing only known-good characters.
- *
- * @param string $string a valid UTF-8 string. Input is not validated.
- * @return string a UTF-8 string in normal form C
- */
- static function toNFC( $string ) {
- if ( NORMALIZE_INTL )
- return normalizer_normalize( $string, Normalizer::FORM_C );
- elseif ( NORMALIZE_ICU )
- return utf8_normalize( $string, self::UNORM_NFC );
- elseif ( UtfNormal::quickIsNFC( $string ) )
- return $string;
- else
- return UtfNormal::NFC( $string );
- }
-
- /**
- * Convert a UTF-8 string to normal form D, canonical decomposition.
- * Fast return for pure ASCII strings.
- *
- * @param string $string a valid UTF-8 string. Input is not validated.
- * @return string a UTF-8 string in normal form D
- */
- static function toNFD( $string ) {
- if ( NORMALIZE_INTL )
- return normalizer_normalize( $string, Normalizer::FORM_D );
- elseif ( NORMALIZE_ICU )
- return utf8_normalize( $string, self::UNORM_NFD );
- elseif ( preg_match( '/[\x80-\xff]/', $string ) )
- return UtfNormal::NFD( $string );
- else
- return $string;
- }
-
- /**
- * Convert a UTF-8 string to normal form KC, compatibility composition.
- * This may cause irreversible information loss, use judiciously.
- * Fast return for pure ASCII strings.
- *
- * @param string $string a valid UTF-8 string. Input is not validated.
- * @return string a UTF-8 string in normal form KC
- */
- static function toNFKC( $string ) {
- if ( NORMALIZE_INTL )
- return normalizer_normalize( $string, Normalizer::FORM_KC );
- elseif ( NORMALIZE_ICU )
- return utf8_normalize( $string, self::UNORM_NFKC );
- elseif ( preg_match( '/[\x80-\xff]/', $string ) )
- return UtfNormal::NFKC( $string );
- else
- return $string;
- }
-
- /**
- * Convert a UTF-8 string to normal form KD, compatibility decomposition.
- * This may cause irreversible information loss, use judiciously.
- * Fast return for pure ASCII strings.
- *
- * @param string $string a valid UTF-8 string. Input is not validated.
- * @return string a UTF-8 string in normal form KD
- */
- static function toNFKD( $string ) {
- if ( NORMALIZE_INTL )
- return normalizer_normalize( $string, Normalizer::FORM_KD );
- elseif ( NORMALIZE_ICU )
- return utf8_normalize( $string, self::UNORM_NFKD );
- elseif ( preg_match( '/[\x80-\xff]/', $string ) )
- return UtfNormal::NFKD( $string );
- else
- return $string;
- }
-
- /**
- * Load the basic composition data if necessary
- * @private
- */
- static function loadData() {
- if ( !isset( self::$utfCombiningClass ) ) {
- require_once __DIR__ . '/UtfNormalData.inc';
- }
- }
-
- /**
- * Returns true if the string is _definitely_ in NFC.
- * Returns false if not or uncertain.
- * @param string $string a valid UTF-8 string. Input is not validated.
- * @return bool
- */
- static function quickIsNFC( $string ) {
- # ASCII is always valid NFC!
- # If it's pure ASCII, let it through.
- if ( !preg_match( '/[\x80-\xff]/', $string ) ) return true;
-
- UtfNormal::loadData();
- $len = strlen( $string );
- for ( $i = 0; $i < $len; $i++ ) {
- $c = $string[$i];
- $n = ord( $c );
- if ( $n < 0x80 ) {
- continue;
- } elseif ( $n >= 0xf0 ) {
- $c = substr( $string, $i, 4 );
- $i += 3;
- } elseif ( $n >= 0xe0 ) {
- $c = substr( $string, $i, 3 );
- $i += 2;
- } elseif ( $n >= 0xc0 ) {
- $c = substr( $string, $i, 2 );
- $i++;
- }
- if ( isset( self::$utfCheckNFC[$c] ) ) {
- # If it's NO or MAYBE, bail and do the slow check.
- return false;
- }
- if ( isset( self::$utfCombiningClass[$c] ) ) {
- # Combining character? We might have to do sorting, at least.
- return false;
- }
- }
-
- return true;
- }
-
- /**
- * Returns true if the string is _definitely_ in NFC.
- * Returns false if not or uncertain.
- * @param string $string a UTF-8 string, altered on output to be valid UTF-8 safe for XML.
- * @return bool
- */
- static function quickIsNFCVerify( &$string ) {
- # Screen out some characters that eg won't be allowed in XML
- $string = preg_replace( '/[\x00-\x08\x0b\x0c\x0e-\x1f]/', UTF8_REPLACEMENT, $string );
-
- # ASCII is always valid NFC!
- # If we're only ever given plain ASCII, we can avoid the overhead
- # of initializing the decomposition tables by skipping out early.
- if ( !preg_match( '/[\x80-\xff]/', $string ) ) return true;
-
- static $checkit = null, $tailBytes = null, $utfCheckOrCombining = null;
- if ( !isset( $checkit ) ) {
- # Load/build some scary lookup tables...
- UtfNormal::loadData();
-
- $utfCheckOrCombining = array_merge( self::$utfCheckNFC, self::$utfCombiningClass );
-
- # Head bytes for sequences which we should do further validity checks
- $checkit = array_flip( array_map( 'chr',
- array( 0xc0, 0xc1, 0xe0, 0xed, 0xef,
- 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
- 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff ) ) );
-
- # Each UTF-8 head byte is followed by a certain
- # number of tail bytes.
- $tailBytes = array();
- for ( $n = 0; $n < 256; $n++ ) {
- if ( $n < 0xc0 ) {
- $remaining = 0;
- } elseif ( $n < 0xe0 ) {
- $remaining = 1;
- } elseif ( $n < 0xf0 ) {
- $remaining = 2;
- } elseif ( $n < 0xf8 ) {
- $remaining = 3;
- } elseif ( $n < 0xfc ) {
- $remaining = 4;
- } elseif ( $n < 0xfe ) {
- $remaining = 5;
- } else {
- $remaining = 0;
- }
- $tailBytes[chr( $n )] = $remaining;
- }
- }
-
- # Chop the text into pure-ASCII and non-ASCII areas;
- # large ASCII parts can be handled much more quickly.
- # Don't chop up Unicode areas for punctuation, though,
- # that wastes energy.
- $matches = array();
- preg_match_all(
- '/([\x00-\x7f]+|[\x80-\xff][\x00-\x40\x5b-\x5f\x7b-\xff]*)/',
- $string, $matches );
-
- $looksNormal = true;
- $base = 0;
- $replace = array();
- foreach ( $matches[1] as $str ) {
- $chunk = strlen( $str );
-
- if ( $str[0] < "\x80" ) {
- # ASCII chunk: guaranteed to be valid UTF-8
- # and in normal form C, so skip over it.
- $base += $chunk;
- continue;
- }
-
- # We'll have to examine the chunk byte by byte to ensure
- # that it consists of valid UTF-8 sequences, and to see
- # if any of them might not be normalized.
- #
- # Since PHP is not the fastest language on earth, some of
- # this code is a little ugly with inner loop optimizations.
-
- $head = '';
- $len = $chunk + 1; # Counting down is faster. I'm *so* sorry.
-
- for ( $i = -1; --$len; ) {
- $remaining = $tailBytes[$c = $str[++$i]];
- if ( $remaining ) {
- # UTF-8 head byte!
- $sequence = $head = $c;
- do {
- # Look for the defined number of tail bytes...
- if ( --$len && ( $c = $str[++$i] ) >= "\x80" && $c < "\xc0" ) {
- # Legal tail bytes are nice.
- $sequence .= $c;
- } else {
- if ( 0 == $len ) {
- # Premature end of string!
- # Drop a replacement character into output to
- # represent the invalid UTF-8 sequence.
- $replace[] = array( UTF8_REPLACEMENT,
- $base + $i + 1 - strlen( $sequence ),
- strlen( $sequence ) );
- break 2;
- } else {
- # Illegal tail byte; abandon the sequence.
- $replace[] = array( UTF8_REPLACEMENT,
- $base + $i - strlen( $sequence ),
- strlen( $sequence ) );
- # Back up and reprocess this byte; it may itself
- # be a legal ASCII or UTF-8 sequence head.
- --$i;
- ++$len;
- continue 2;
- }
- }
- } while ( --$remaining );
-
- if ( isset( $checkit[$head] ) ) {
- # Do some more detailed validity checks, for
- # invalid characters and illegal sequences.
- if ( $head == "\xed" ) {
- # 0xed is relatively frequent in Korean, which
- # abuts the surrogate area, so we're doing
- # this check separately to speed things up.
-
- if ( $sequence >= UTF8_SURROGATE_FIRST ) {
- # Surrogates are legal only in UTF-16 code.
- # They are totally forbidden here in UTF-8
- # utopia.
- $replace[] = array( UTF8_REPLACEMENT,
- $base + $i + 1 - strlen( $sequence ),
- strlen( $sequence ) );
- $head = '';
- continue;
- }
- } else {
- # Slower, but rarer checks...
- $n = ord( $head );
- if (
- # "Overlong sequences" are those that are syntactically
- # correct but use more UTF-8 bytes than are necessary to
- # encode a character. Naïve string comparisons can be
- # tricked into failing to see a match for an ASCII
- # character, for instance, which can be a security hole
- # if blacklist checks are being used.
- ( $n < 0xc2 && $sequence <= UTF8_OVERLONG_A )
- || ( $n == 0xe0 && $sequence <= UTF8_OVERLONG_B )
- || ( $n == 0xf0 && $sequence <= UTF8_OVERLONG_C )
-
- # U+FFFE and U+FFFF are explicitly forbidden in Unicode.
- || ( $n == 0xef &&
- ( $sequence == UTF8_FFFE )
- || ( $sequence == UTF8_FFFF ) )
-
- # Unicode has been limited to 21 bits; longer
- # sequences are not allowed.
- || ( $n >= 0xf0 && $sequence > UTF8_MAX )
- ) {
-
- $replace[] = array( UTF8_REPLACEMENT,
- $base + $i + 1 - strlen( $sequence ),
- strlen( $sequence ) );
- $head = '';
- continue;
- }
- }
- }
-
- if ( isset( $utfCheckOrCombining[$sequence] ) ) {
- # If it's NO or MAYBE, we'll have to rip
- # the string apart and put it back together.
- # That's going to be mighty slow.
- $looksNormal = false;
- }
-
- # The sequence is legal!
- $head = '';
- } elseif ( $c < "\x80" ) {
- # ASCII byte.
- $head = '';
- } elseif ( $c < "\xc0" ) {
- # Illegal tail bytes
- if ( $head == '' ) {
- # Out of the blue!
- $replace[] = array( UTF8_REPLACEMENT, $base + $i, 1 );
- } else {
- # Don't add if we're continuing a broken sequence;
- # we already put a replacement character when we looked
- # at the broken sequence.
- $replace[] = array( '', $base + $i, 1 );
- }
- } else {
- # Miscellaneous freaks.
- $replace[] = array( UTF8_REPLACEMENT, $base + $i, 1 );
- $head = '';
- }
- }
- $base += $chunk;
- }
- if ( count( $replace ) ) {
- # There were illegal UTF-8 sequences we need to fix up.
- $out = '';
- $last = 0;
- foreach ( $replace as $rep ) {
- list( $replacement, $start, $length ) = $rep;
- if ( $last < $start ) {
- $out .= substr( $string, $last, $start - $last );
- }
- $out .= $replacement;
- $last = $start + $length;
- }
- if ( $last < strlen( $string ) ) {
- $out .= substr( $string, $last );
- }
- $string = $out;
- }
-
- return $looksNormal;
- }
-
- # These take a string and run the normalization on them, without
- # checking for validity or any optimization etc. Input must be
- # VALID UTF-8!
- /**
- * @param $string string
- * @return string
- * @private
- */
- static function NFC( $string ) {
- return UtfNormal::fastCompose( UtfNormal::NFD( $string ) );
- }
-
- /**
- * @param $string string
- * @return string
- * @private
- */
- static function NFD( $string ) {
- UtfNormal::loadData();
-
- return UtfNormal::fastCombiningSort(
- UtfNormal::fastDecompose( $string, self::$utfCanonicalDecomp ) );
- }
-
- /**
- * @param $string string
- * @return string
- * @private
- */
- static function NFKC( $string ) {
- return UtfNormal::fastCompose( UtfNormal::NFKD( $string ) );
- }
-
- /**
- * @param $string string
- * @return string
- * @private
- */
- static function NFKD( $string ) {
- if ( !isset( self::$utfCompatibilityDecomp ) ) {
- require_once 'UtfNormalDataK.inc';
- }
-
- return self::fastCombiningSort(
- self::fastDecompose( $string, self::$utfCompatibilityDecomp ) );
- }
-
- /**
- * Perform decomposition of a UTF-8 string into either D or KD form
- * (depending on which decomposition map is passed to us).
- * Input is assumed to be *valid* UTF-8. Invalid code will break.
- * @private
- * @param string $string valid UTF-8 string
- * @param array $map hash of expanded decomposition map
- * @return string a UTF-8 string decomposed, not yet normalized (needs sorting)
- */
- static function fastDecompose( $string, $map ) {
- UtfNormal::loadData();
- $len = strlen( $string );
- $out = '';
- for ( $i = 0; $i < $len; $i++ ) {
- $c = $string[$i];
- $n = ord( $c );
- if ( $n < 0x80 ) {
- # ASCII chars never decompose
- # THEY ARE IMMORTAL
- $out .= $c;
- continue;
- } elseif ( $n >= 0xf0 ) {
- $c = substr( $string, $i, 4 );
- $i += 3;
- } elseif ( $n >= 0xe0 ) {
- $c = substr( $string, $i, 3 );
- $i += 2;
- } elseif ( $n >= 0xc0 ) {
- $c = substr( $string, $i, 2 );
- $i++;
- }
- if ( isset( $map[$c] ) ) {
- $out .= $map[$c];
- continue;
- } else {
- if ( $c >= UTF8_HANGUL_FIRST && $c <= UTF8_HANGUL_LAST ) {
- # Decompose a hangul syllable into jamo;
- # hardcoded for three-byte UTF-8 sequence.
- # A lookup table would be slightly faster,
- # but adds a lot of memory & disk needs.
- #
- $index = ( ( ord( $c[0] ) & 0x0f ) << 12
- | ( ord( $c[1] ) & 0x3f ) << 6
- | ( ord( $c[2] ) & 0x3f ) )
- - UNICODE_HANGUL_FIRST;
- $l = intval( $index / UNICODE_HANGUL_NCOUNT );
- $v = intval( ( $index % UNICODE_HANGUL_NCOUNT ) / UNICODE_HANGUL_TCOUNT );
- $t = $index % UNICODE_HANGUL_TCOUNT;
- $out .= "\xe1\x84" . chr( 0x80 + $l ) . "\xe1\x85" . chr( 0xa1 + $v );
- if ( $t >= 25 ) {
- $out .= "\xe1\x87" . chr( 0x80 + $t - 25 );
- } elseif ( $t ) {
- $out .= "\xe1\x86" . chr( 0xa7 + $t );
- }
- continue;
- }
- }
- $out .= $c;
- }
-
- return $out;
- }
-
- /**
- * Sorts combining characters into canonical order. This is the
- * final step in creating decomposed normal forms D and KD.
- * @private
- * @param string $string a valid, decomposed UTF-8 string. Input is not validated.
- * @return string a UTF-8 string with combining characters sorted in canonical order
- */
- static function fastCombiningSort( $string ) {
- UtfNormal::loadData();
- $len = strlen( $string );
- $out = '';
- $combiners = array();
- $lastClass = -1;
- for ( $i = 0; $i < $len; $i++ ) {
- $c = $string[$i];
- $n = ord( $c );
- if ( $n >= 0x80 ) {
- if ( $n >= 0xf0 ) {
- $c = substr( $string, $i, 4 );
- $i += 3;
- } elseif ( $n >= 0xe0 ) {
- $c = substr( $string, $i, 3 );
- $i += 2;
- } elseif ( $n >= 0xc0 ) {
- $c = substr( $string, $i, 2 );
- $i++;
- }
- if ( isset( self::$utfCombiningClass[$c] ) ) {
- $lastClass = self::$utfCombiningClass[$c];
- if ( isset( $combiners[$lastClass] ) ) {
- $combiners[$lastClass] .= $c;
- } else {
- $combiners[$lastClass] = $c;
- }
- continue;
- }
- }
- if ( $lastClass ) {
- ksort( $combiners );
- $out .= implode( '', $combiners );
- $combiners = array();
- }
- $out .= $c;
- $lastClass = 0;
- }
- if ( $lastClass ) {
- ksort( $combiners );
- $out .= implode( '', $combiners );
- }
-
- return $out;
- }
-
- /**
- * Produces canonically composed sequences, i.e. normal form C or KC.
- *
- * @private
- * @param string $string a valid UTF-8 string in sorted normal form D or KD.
- * Input is not validated.
- * @return string a UTF-8 string with canonical precomposed characters used
- * where possible.
- */
- static function fastCompose( $string ) {
- UtfNormal::loadData();
- $len = strlen( $string );
- $out = '';
- $lastClass = -1;
- $lastHangul = 0;
- $startChar = '';
- $combining = '';
- $x1 = ord( substr( UTF8_HANGUL_VBASE, 0, 1 ) );
- $x2 = ord( substr( UTF8_HANGUL_TEND, 0, 1 ) );
- for ( $i = 0; $i < $len; $i++ ) {
- $c = $string[$i];
- $n = ord( $c );
- if ( $n < 0x80 ) {
- # No combining characters here...
- $out .= $startChar;
- $out .= $combining;
- $startChar = $c;
- $combining = '';
- $lastClass = 0;
- continue;
- } elseif ( $n >= 0xf0 ) {
- $c = substr( $string, $i, 4 );
- $i += 3;
- } elseif ( $n >= 0xe0 ) {
- $c = substr( $string, $i, 3 );
- $i += 2;
- } elseif ( $n >= 0xc0 ) {
- $c = substr( $string, $i, 2 );
- $i++;
- }
- $pair = $startChar . $c;
- if ( $n > 0x80 ) {
- if ( isset( self::$utfCombiningClass[$c] ) ) {
- # A combining char; see what we can do with it
- $class = self::$utfCombiningClass[$c];
- if ( !empty( $startChar ) &&
- $lastClass < $class &&
- $class > 0 &&
- isset( self::$utfCanonicalComp[$pair] )
- ) {
- $startChar = self::$utfCanonicalComp[$pair];
- $class = 0;
- } else {
- $combining .= $c;
- }
- $lastClass = $class;
- $lastHangul = 0;
- continue;
- }
- }
- # New start char
- if ( $lastClass == 0 ) {
- if ( isset( self::$utfCanonicalComp[$pair] ) ) {
- $startChar = self::$utfCanonicalComp[$pair];
- $lastHangul = 0;
- continue;
- }
- if ( $n >= $x1 && $n <= $x2 ) {
- # WARNING: Hangul code is painfully slow.
- # I apologize for this ugly, ugly code; however
- # performance is even more teh suck if we call
- # out to nice clean functions. Lookup tables are
- # marginally faster, but require a lot of space.
- #
- if ( $c >= UTF8_HANGUL_VBASE &&
- $c <= UTF8_HANGUL_VEND &&
- $startChar >= UTF8_HANGUL_LBASE &&
- $startChar <= UTF8_HANGUL_LEND
- ) {
- #
- #$lIndex = utf8ToCodepoint( $startChar ) - UNICODE_HANGUL_LBASE;
- #$vIndex = utf8ToCodepoint( $c ) - UNICODE_HANGUL_VBASE;
- $lIndex = ord( $startChar[2] ) - 0x80;
- $vIndex = ord( $c[2] ) - 0xa1;
-
- $hangulPoint = UNICODE_HANGUL_FIRST +
- UNICODE_HANGUL_TCOUNT *
- ( UNICODE_HANGUL_VCOUNT * $lIndex + $vIndex );
-
- # Hardcode the limited-range UTF-8 conversion:
- $startChar = chr( $hangulPoint >> 12 & 0x0f | 0xe0 ) .
- chr( $hangulPoint >> 6 & 0x3f | 0x80 ) .
- chr( $hangulPoint & 0x3f | 0x80 );
- $lastHangul = 0;
- continue;
- } elseif ( $c >= UTF8_HANGUL_TBASE &&
- $c <= UTF8_HANGUL_TEND &&
- $startChar >= UTF8_HANGUL_FIRST &&
- $startChar <= UTF8_HANGUL_LAST &&
- !$lastHangul
- ) {
- # $tIndex = utf8ToCodepoint( $c ) - UNICODE_HANGUL_TBASE;
- $tIndex = ord( $c[2] ) - 0xa7;
- if ( $tIndex < 0 ) $tIndex = ord( $c[2] ) - 0x80 + ( 0x11c0 - 0x11a7 );
-
- # Increment the code point by $tIndex, without
- # the function overhead of decoding and recoding UTF-8
- #
- $tail = ord( $startChar[2] ) + $tIndex;
- if ( $tail > 0xbf ) {
- $tail -= 0x40;
- $mid = ord( $startChar[1] ) + 1;
- if ( $mid > 0xbf ) {
- $startChar[0] = chr( ord( $startChar[0] ) + 1 );
- $mid -= 0x40;
- }
- $startChar[1] = chr( $mid );
- }
- $startChar[2] = chr( $tail );
-
- # If there's another jamo char after this, *don't* try to merge it.
- $lastHangul = 1;
- continue;
- }
- }
- }
- $out .= $startChar;
- $out .= $combining;
- $startChar = $c;
- $combining = '';
- $lastClass = 0;
- $lastHangul = 0;
- }
- $out .= $startChar . $combining;
-
- return $out;
- }
-
- /**
- * This is just used for the benchmark, comparing how long it takes to
- * interate through a string without really doing anything of substance.
- * @param $string string
- * @return string
- */
- static function placebo( $string ) {
- $len = strlen( $string );
- $out = '';
- for ( $i = 0; $i < $len; $i++ ) {
- $out .= $string[$i];
- }
-
- return $out;
- }
-
- /**
- * Function to replace some characters that we don't want
- * but most of the native normalize functions keep.
- *
- * @param string $string The string
- * @return String String with the character codes replaced.
- */
- private static function replaceForNativeNormalize( $string ) {
- $string = preg_replace(
- '/[\x00-\x08\x0b\x0c\x0e-\x1f]/',
- UTF8_REPLACEMENT,
- $string );
- $string = str_replace( UTF8_FFFE, UTF8_REPLACEMENT, $string );
- $string = str_replace( UTF8_FFFF, UTF8_REPLACEMENT, $string );
-
- return $string;
- }
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-21 20:06:25 +0000