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UnicodeEscaper.php
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UnicodeEscaper.php
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<?php
namespace Wikimedia\Purtle;
/**
* Helper class for turning non-ascii characters into Python-style unicode escape sequences.
*
* @author Daniel Kinzler
*
* Most of this class was copied from EasyRdf's Ntriples.php.
* The following licensing terms apply to the copied code:
*
* Copyright (c) 2009-2013 Nicholas J Humfrey. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php BSD-2-Clause
*/
class UnicodeEscaper {
/**
* @var string[] Character encoding cache
*/
private $escChars = [];
/**
* @param string $str
*
* @return string
*/
public function escapeString( $str ) {
$result = '';
$strLen = mb_strlen( $str, 'UTF-8' );
for ( $i = 0; $i < $strLen; $i++ ) {
$c = mb_substr( $str, $i, 1, 'UTF-8' );
if ( !isset( $this->escChars[$c] ) ) {
$this->escChars[$c] = $this->escapedChar( $c );
}
$result .= $this->escChars[$c];
}
return $result;
}
/**
* @param string $cUtf
*
* @return int
*/
private function unicodeCharNo( $cUtf ) {
$bl = strlen( $cUtf ); /* binary length */
$r = 0;
switch ( $bl ) {
case 1: /* 0####### (0-127) */
$r = ord( $cUtf );
break;
case 2: /* 110##### 10###### = 192+x 128+x */
$r = ( ( ord( $cUtf[0] ) - 192 ) * 64 ) +
( ord( $cUtf[1] ) - 128 );
break;
case 3: /* 1110#### 10###### 10###### = 224+x 128+x 128+x */
$r = ( ( ord( $cUtf[0] ) - 224 ) * 4096 ) +
( ( ord( $cUtf[1] ) - 128 ) * 64 ) +
( ord( $cUtf[2] ) - 128 );
break;
case 4: /* 1111#### 10###### 10###### 10###### = 240+x 128+x 128+x 128+x */
$r = ( ( ord( $cUtf[0] ) - 240 ) * 262144 ) +
( ( ord( $cUtf[1] ) - 128 ) * 4096 ) +
( ( ord( $cUtf[2] ) - 128 ) * 64 ) +
( ord( $cUtf[3] ) - 128 );
break;
}
return $r;
}
/**
* @param string $c
*
* @return string
*/
private function escapedChar( $c ) {
$no = $this->unicodeCharNo( $c );
/* see http://www.w3.org/TR/rdf-testcases/#ntrip_strings */
if ( $no < 9 ) {
return '\u' . sprintf( '%04X', $no ); /* #x0-#x8 (0-8) */
} elseif ( $no == 9 ) {
return '\t'; /* #x9 (9) */
} elseif ( $no == 10 ) {
return '\n'; /* #xA (10) */
} elseif ( $no < 13 ) {
return '\u' . sprintf( '%04X', $no ); /* #xB-#xC (11-12) */
} elseif ( $no == 13 ) {
return '\r'; /* #xD (13) */
} elseif ( $no < 32 ) {
return '\u' . sprintf( '%04X', $no ); /* #xE-#x1F (14-31) */
} elseif ( $no < 127 ) {
return $c; /* #x20-#x7E (32-126) */
} elseif ( $no < 65536 ) {
return '\u' . sprintf( '%04X', $no ); /* #x7F-#xFFFF (128-65535) */
} elseif ( $no < 1114112 ) {
return '\U' . sprintf( '%08X', $no ); /* #x10000-#x10FFFF (65536-1114111) */
} else {
return ''; /* not defined => ignore */
}
}
}

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Aug 19 2026, 19:36 (6 w, 6 d ago)
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UnicodeEscaper.php (4 KB)

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