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Utils.php
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Utils.php
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<?php
namespace UtfNormal;
use InvalidArgumentException;
/**
* Some of these functions are adapted from places in MediaWiki.
* Should probably merge them for consistency.
*
* 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
*/
class Utils {
/**
* Return UTF-8 sequence for a given Unicode code point.
*
* @param int $codepoint
* @return string
* @throws InvalidArgumentException if fed out of range data.
*/
public static function codepointToUtf8( $codepoint ) {
// In PHP 7.2, mb_chr is buggy when $codepoint is 0 (null byte)
if ( $codepoint === 0 ) {
return "\u{0000}";
}
$char = mb_chr( $codepoint );
if ( $char === false ) {
throw new InvalidArgumentException( "Asked for code outside of range ($codepoint)" );
}
return $char;
}
/**
* Take a series of space-separated hexadecimal numbers representing
* Unicode code points and return a UTF-8 string composed of those
* characters. Used by UTF-8 data generation and testing routines.
*
* @param string $sequence
* @return string
* @throws InvalidArgumentException if fed out of range data.
* @private Used in tests and data table generation
*/
public static function hexSequenceToUtf8( $sequence ) {
$utf = '';
foreach ( explode( ' ', $sequence ) as $hex ) {
$n = hexdec( $hex );
$utf .= self::codepointToUtf8( $n );
}
return $utf;
}
/**
* Take a UTF-8 string and return a space-separated series of hex
* numbers representing Unicode code points. For debugging.
*
* @param string $str UTF-8 string.
* @return string
* @private
*/
private static function utf8ToHexSequence( $str ) {
$buf = '';
foreach ( preg_split( '//u', $str, -1, PREG_SPLIT_NO_EMPTY ) as $cp ) {
$buf .= sprintf( '%04x ', mb_ord( $cp ) );
}
return rtrim( $buf );
}
/**
* Determine the Unicode codepoint of a single-character UTF-8 sequence.
* Does not check for invalid input data.
*
* @deprecated since 2.1, use mb_ord()
*
* @param string $char
* @return int|false
*/
public static function utf8ToCodepoint( $char ) {
return mb_strlen( $char ) > 1 ? false : mb_ord( $char );
}
/**
* Escape a string for inclusion in a PHP single-quoted string literal.
*
* @param string $string String to be escaped.
* @return string Escaped string.
*/
public static function escapeSingleString( $string ) {
return strtr(
$string,
[
'\\' => '\\\\',
'\'' => '\\\''
]
);
}
}

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