MediaWiki 1.30.2

[autoinstallsdev/mediawiki.git] / vendor / wikimedia / purtle / src / UnicodeEscaper.php

diff --git a/vendor/wikimedia/purtle/src/UnicodeEscaper.php b/vendor/wikimedia/purtle/src/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
+ */
+class UnicodeEscaper {
+
+       private $escChars = []; // Character encoding cache
+
+       /**
+        * @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;
+       }
+
+       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;
+       }
+
+       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 */
+               }
+       }
+
+}