142 lines
3.6 KiB
PHP
142 lines
3.6 KiB
PHP
<?php
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# Copyright (C) 2004 Brion Vibber <brion@pobox.com>
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# http://www.mediawiki.org/
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# http://www.gnu.org/copyleft/gpl.html
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/**
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* Some of these functions are adapted from places in MediaWiki.
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* Should probably merge them for consistency.
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*
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* @package UtfNormal
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* @access public
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*/
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/** */
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/**
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* Return UTF-8 sequence for a given Unicode code point.
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* May die if fed out of range data.
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*
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* @param int $codepoint
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* @return string
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* @access public
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*/
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function codepointToUtf8( $codepoint ) {
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if($codepoint < 0x80) return chr($codepoint);
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if($codepoint < 0x800) return chr($codepoint >> 6 & 0x3f | 0xc0) .
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chr($codepoint & 0x3f | 0x80);
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if($codepoint < 0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
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chr($codepoint >> 6 & 0x3f | 0x80) .
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chr($codepoint & 0x3f | 0x80);
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if($codepoint < 0x110000) return chr($codepoint >> 18 & 0x07 | 0xf0) .
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chr($codepoint >> 12 & 0x3f | 0x80) .
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chr($codepoint >> 6 & 0x3f | 0x80) .
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chr($codepoint & 0x3f | 0x80);
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echo "Asked for code outside of range ($codepoint)\n";
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die( -1 );
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}
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/**
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* Take a series of space-separated hexadecimal numbers representing
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* Unicode code points and return a UTF-8 string composed of those
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* characters. Used by UTF-8 data generation and testing routines.
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*
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* @param string $sequence
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* @return string
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* @access private
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*/
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function hexSequenceToUtf8( $sequence ) {
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$utf = '';
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foreach( explode( ' ', $sequence ) as $hex ) {
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$n = hexdec( $hex );
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$utf .= codepointToUtf8( $n );
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}
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return $utf;
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}
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/**
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* Take a UTF-8 string and return a space-separated series of hex
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* numbers representing Unicode code points. For debugging.
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*
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* @param string $str
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* @return string
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* @access private
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*/
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function utf8ToHexSequence( $str ) {
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return rtrim( preg_replace( '/(.)/uSe',
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'sprintf("%04x ", utf8ToCodepoint("$1"))',
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$str ) );
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}
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/**
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* Determine the Unicode codepoint of a single-character UTF-8 sequence.
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* Does not check for invalid input data.
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*
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* @param string $char
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* @return int
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* @access public
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*/
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function utf8ToCodepoint( $char ) {
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# Find the length
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$z = ord( $char{0} );
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if ( $z & 0x80 ) {
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$length = 0;
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while ( $z & 0x80 ) {
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$length++;
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$z <<= 1;
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}
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} else {
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$length = 1;
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}
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if ( $length != strlen( $char ) ) {
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return false;
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}
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if ( $length == 1 ) {
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return ord( $char );
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}
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# Mask off the length-determining bits and shift back to the original location
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$z &= 0xff;
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$z >>= $length;
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# Add in the free bits from subsequent bytes
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for ( $i=1; $i<$length; $i++ ) {
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$z <<= 6;
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$z |= ord( $char{$i} ) & 0x3f;
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}
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return $z;
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}
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/**
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* Escape a string for inclusion in a PHP single-quoted string literal.
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*
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* @param string $string
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* @return string
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* @access public
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*/
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function escapeSingleString( $string ) {
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return strtr( $string,
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array(
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'\\' => '\\\\',
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'\'' => '\\\''
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));
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}
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?>
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