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<?php
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/**
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* Hoa
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*
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*
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* @license
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*
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* New BSD License
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*
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* Copyright © 2007-2017, Hoa community. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the Hoa nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Psy\Readline\Hoa;
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/**
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* This class represents a UTF-8 string.
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* Please, see:
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* * http://www.ietf.org/rfc/rfc3454.txt,
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* * http://unicode.org/reports/tr9/,
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* * http://www.unicode.org/Public/6.0.0/ucd/UnicodeData.txt.
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*/
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class Ustring
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{
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/**
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* Check if ext/mbstring is available.
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*/
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public static function checkMbString(): bool
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{
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return \function_exists('mb_substr');
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}
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/**
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* Get the number of column positions of a wide-character.
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*
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* This is a PHP implementation of wcwidth() and wcswidth() (defined in IEEE
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* Std 1002.1-2001) for Unicode, by Markus Kuhn. Please, see
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* http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c.
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*
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* The wcwidth(wc) function shall either return 0 (if wc is a null
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* wide-character code), or return the number of column positions to be
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* occupied by the wide-character code wc, or return -1 (if wc does not
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* correspond to a printable wide-character code).
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*/
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public static function getCharWidth(string $char): int
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{
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$char = (string) $char;
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$c = static::toCode($char);
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// Test for 8-bit control characters.
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if (0x0 === $c) {
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return 0;
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}
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if (0x20 > $c || (0x7F <= $c && $c < 0xA0)) {
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return -1;
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}
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// Non-spacing characters.
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if (0xAD !== $c &&
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return 0;
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}
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// If we arrive here, $c is not a combining C0/C1 control character.
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return 1 +
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(0x1100 <= $c &&
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(0x115F >= $c || // Hangul Jamo init. consonants
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0x2329 === $c || 0x232A === $c ||
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(0x2E80 <= $c && 0xA4CF >= $c &&
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0x303F !== $c) || // CJK…Yi
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(0xAC00 <= $c && 0xD7A3 >= $c) || // Hangul Syllables
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(0xF900 <= $c && 0xFAFF >= $c) || // CJK Compatibility Ideographs
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(0xFE10 <= $c && 0xFE19 >= $c) || // Vertical forms
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(0xFE30 <= $c && 0xFE6F >= $c) || // CJK Compatibility Forms
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(0xFF00 <= $c && 0xFF60 >= $c) || // Fullwidth Forms
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(0xFFE0 <= $c && 0xFFE6 >= $c) ||
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(0x20000 <= $c && 0x2FFFD >= $c) ||
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(0x30000 <= $c && 0x3FFFD >= $c)));
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}
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/**
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* Check whether the character is printable or not.
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*/
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public static function isCharPrintable(string $char): bool
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{
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return 1 <= static::getCharWidth($char);
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}
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/**
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* Get a decimal code representation of a specific character.
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*/
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public static function toCode(string $char): int
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{
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$char = (string) $char;
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$code = \ord($char[0]);
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$bytes = 1;
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if (!($code & 0x80)) { // 0xxxxxxx
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return $code;
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}
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if (($code & 0xE0) === 0xC0) { // 110xxxxx
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$bytes = 2;
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$code = $code & ~0xC0;
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} elseif (($code & 0xF0) === 0xE0) { // 1110xxxx
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$bytes = 3;
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$code = $code & ~0xE0;
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} elseif (($code & 0xF8) === 0xF0) { // 11110xxx
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$bytes = 4;
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$code = $code & ~0xF0;
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}
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for ($i = 2; $i <= $bytes; $i++) { // 10xxxxxx
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$code = ($code << 6) + (\ord($char[$i - 1]) & ~0x80);
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}
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return $code;
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}
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}
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