54 lines
1.1 KiB
PHP
54 lines
1.1 KiB
PHP
<?php
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/**
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* @package s9e\RegexpBuilder
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* @copyright Copyright (c) 2016-2018 The s9e Authors
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License
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*/
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namespace s9e\RegexpBuilder\Output;
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use InvalidArgumentException;
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class Utf8 extends BaseImplementation
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{
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/** {@inheritdoc} */
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protected $maxValue = 0x10FFFF;
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/**
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* {@inheritdoc}
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*/
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protected function outputValidValue($value)
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{
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if ($value < 0x80)
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{
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return chr($value);
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}
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if ($value < 0x800)
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{
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return chr(0xC0 | ($value >> 6)) . chr(0x80 | ($value & 0x3F));
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}
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if ($value < 0x10000)
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{
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return chr(0xE0 | ($value >> 12))
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. chr(0x80 | (($value >> 6) & 0x3F))
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. chr(0x80 | ($value & 0x3F));
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}
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return chr(0xF0 | ($value >> 18))
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. chr(0x80 | (($value >> 12) & 0x3F))
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. chr(0x80 | (($value >> 6) & 0x3F))
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. chr(0x80 | ($value & 0x3F));
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}
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/**
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* {@inheritdoc}
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*/
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protected function validate($value)
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{
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if ($value >= 0xD800 && $value <= 0xDFFF)
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{
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throw new InvalidArgumentException(sprintf('Surrogate 0x%X is not a valid UTF-8 character', $value));
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}
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parent::validate($value);
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}
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} |