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<?php |
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/** |
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* webtrees: online genealogy |
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* Copyright (C) 2021 webtrees development team |
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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 3 of the License, or |
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* (at your option) any later version. |
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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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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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declare(strict_types=1); |
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namespace Fisharebest\Webtrees\Encodings; |
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use function array_flip; |
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use function array_map; |
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use function implode; |
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use function ord; |
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use function preg_split; |
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use function strlen; |
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use function strrpos; |
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use function strtr; |
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use const PREG_SPLIT_NO_EMPTY; |
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/** |
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* Convert between an encoding and UTF-8. |
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*/ |
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abstract class AbstractEncoding implements EncodingInterface |
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{ |
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protected const REPLACEMENT_CHARACTER = '?'; |
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/** @var array<string,string> Encoded character => utf8 character */ |
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protected const TO_UTF8 = []; |
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/** |
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* Convert a string from UTF-8 to another encoding. |
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* |
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* @param string $text |
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* |
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* @return string |
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*/ |
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public function fromUtf8(string $text): string |
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{ |
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$utf8 = array_flip(static::TO_UTF8); |
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$utf8[UTF8::REPLACEMENT_CHARACTER] = static::REPLACEMENT_CHARACTER; |
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$chars = preg_split('//u', $text, -1, PREG_SPLIT_NO_EMPTY); |
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$chars = array_map(static function (string $char) use ($utf8): string { |
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if (ord($char) < 128) { |
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return $char; |
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} |
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return $utf8[$char] ?? static::REPLACEMENT_CHARACTER; |
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}, $chars); |
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return implode('', $chars); |
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} |
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/** |
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* Convert a string from another encoding to UTF-8. |
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* |
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* @param string $text |
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* |
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* @return string |
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*/ |
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public function toUtf8(string $text): string |
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{ |
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return strtr($text, static::TO_UTF8); |
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} |
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/** |
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* When reading multi-byte encodings using a stream, we must avoid incomplete characters. |
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* |
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* @param string $text |
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* |
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* @return int |
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*/ |
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public function convertibleBytes(string $text): int |
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{ |
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$safe_chars = [ |
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$this->fromUtf8("\n"), |
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$this->fromUtf8("\r"), |
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$this->fromUtf8(' '), |
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]; |
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foreach ($safe_chars as $char) { |
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$pos = strrpos($text, $char); |
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if ($pos !== false) { |
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return $pos + strlen($char); |
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} |
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} |
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return 0; |
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} |
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} |
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fisharebest /
webtrees
