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<?php
/**
* Hoa
*
*
* @license
*
* New BSD License
*
* Copyright © 2007-2017, Hoa community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the Hoa nor the names of its contributors 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 HOLDERS AND 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.
*/
namespace Psy\Readline\Hoa;
/**
* This class represents a UTF-8 string.
* Please, see:
* * http://www.ietf.org/rfc/rfc3454.txt,
* * http://unicode.org/reports/tr9/,
* * http://www.unicode.org/Public/6.0.0/ucd/UnicodeData.txt.
*/
class Ustring
{
/**
* Check if ext/mbstring is available.
*/
public static function checkMbString(): bool
{
return \function_exists('mb_substr');
}
/**
* Get the number of column positions of a wide-character.
*
* This is a PHP implementation of wcwidth() and wcswidth() (defined in IEEE
* Std 1002.1-2001) for Unicode, by Markus Kuhn. Please, see
* http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c.
*
* The wcwidth(wc) function shall either return 0 (if wc is a null
* wide-character code), or return the number of column positions to be
* occupied by the wide-character code wc, or return -1 (if wc does not
* correspond to a printable wide-character code).
*/
public static function getCharWidth(string $char): int
{
$char = (string) $char;
$c = static::toCode($char);
// Test for 8-bit control characters.
if (0x0 === $c) {
return 0;
}
if (0x20 > $c || (0x7F <= $c && $c < 0xA0)) {
return -1;
}
// Non-spacing characters.
if (0xAD !== $c &&
0 !== \preg_match('#^[\p{Mn}\p{Me}\p{Cf}\x{1160}-\x{11ff}\x{200b}]#u', $char)) {
return 0;
}
// If we arrive here, $c is not a combining C0/C1 control character.
return 1 +
(0x1100 <= $c &&
(0x115F >= $c || // Hangul Jamo init. consonants
0x2329 === $c || 0x232A === $c ||
(0x2E80 <= $c && 0xA4CF >= $c &&
0x303F !== $c) || // CJK…Yi
(0xAC00 <= $c && 0xD7A3 >= $c) || // Hangul Syllables
(0xF900 <= $c && 0xFAFF >= $c) || // CJK Compatibility Ideographs
(0xFE10 <= $c && 0xFE19 >= $c) || // Vertical forms
(0xFE30 <= $c && 0xFE6F >= $c) || // CJK Compatibility Forms
(0xFF00 <= $c && 0xFF60 >= $c) || // Fullwidth Forms
(0xFFE0 <= $c && 0xFFE6 >= $c) ||
(0x20000 <= $c && 0x2FFFD >= $c) ||
(0x30000 <= $c && 0x3FFFD >= $c)));
}
/**
* Check whether the character is printable or not.
*/
public static function isCharPrintable(string $char): bool
{
return 1 <= static::getCharWidth($char);
}
/**
* Get a decimal code representation of a specific character.
*/
public static function toCode(string $char): int
{
$char = (string) $char;
$code = \ord($char[0]);
$bytes = 1;
if (!($code & 0x80)) { // 0xxxxxxx
return $code;
}
if (($code & 0xE0) === 0xC0) { // 110xxxxx
$bytes = 2;
$code = $code & ~0xC0;
} elseif (($code & 0xF0) === 0xE0) { // 1110xxxx
$bytes = 3;
$code = $code & ~0xE0;
} elseif (($code & 0xF8) === 0xF0) { // 11110xxx
$bytes = 4;
$code = $code & ~0xF0;
}
for ($i = 2; $i <= $bytes; $i++) { // 10xxxxxx
$code = ($code << 6) + (\ord($char[$i - 1]) & ~0x80);
}
return $code;
}
}
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