<?php
/**
* Some of these functions are adapted from places in MediaWiki.
* Should probably merge them for consistency.
*
* Copyright © 2004 Brion Vibber <brion@pobox.com>
* http://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
*/
/**
* Return UTF-8 sequence for a given Unicode code point.
* May die if fed out of range data.
*
* @param $codepoint Integer:
* @return String
* @public
*/
function codepointToUtf8( $codepoint ) {
if($codepoint < 0x80) return chr($codepoint);
if($codepoint < 0x800) return chr($codepoint >> 6 & 0x3f | 0xc0) .
chr($codepoint & 0x3f | 0x80);
if($codepoint < 0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
chr($codepoint >> 6 & 0x3f | 0x80) .
chr($codepoint & 0x3f | 0x80);
if($codepoint < 0x110000) return chr($codepoint >> 18 & 0x07 | 0xf0) .
chr($codepoint >> 12 & 0x3f | 0x80) .
chr($codepoint >> 6 & 0x3f | 0x80) .
chr($codepoint & 0x3f | 0x80);
echo "Asked for code outside of range ($codepoint)\n";
die( -1 );
}
/**
* 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 $sequence String
* @return String
* @private
*/
function hexSequenceToUtf8( $sequence ) {
$utf = '';
foreach( explode( ' ', $sequence ) as $hex ) {
$n = hexdec( $hex );
$utf .= 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
*/
function utf8ToHexSequence( $str ) {
$buf = '';
foreach ( preg_split( '//u', $str, -1, PREG_SPLIT_NO_EMPTY ) as $cp ) {
$buf .= sprintf( '%04x ', utf8ToCodepoint( $cp ) );
}
return rtrim( $buf );
}
/**
* Determine the Unicode codepoint of a single-character UTF-8 sequence.
* Does not check for invalid input data.
*
* @param $char String
* @return Integer
* @public
*/
function utf8ToCodepoint( $char ) {
# Find the length
$z = ord( $char[0] );
if ( $z & 0x80 ) {
$length = 0;
while ( $z & 0x80 ) {
$length++;
$z <<= 1;
}
} else {
$length = 1;
}
if ( $length != strlen( $char ) ) {
return false;
}
if ( $length == 1 ) {
return ord( $char );
}
# Mask off the length-determining bits and shift back to the original location
$z &= 0xff;
$z >>= $length;
# Add in the free bits from subsequent bytes
for ( $i=1; $i < $length; $i++ ) {
$z <<= 6;
$z |= ord( $char[$i] ) & 0x3f;
}
return $z;
}
/**
* Escape a string for inclusion in a PHP single-quoted string literal.
*
* @param string $string string to be escaped.
* @return String: escaped string.
* @public
*/
function escapeSingleString( $string ) {
return strtr( $string,
array(
'\\' => '\\\\',
'\'' => '\\\''
));
}