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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2018 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\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors; |
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class MultiByteStringManipulation extends AbstractConvertor |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getRegexpGroups() |
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{ |
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return [ |
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'Substring' => 'String' |
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]; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getRegexps() |
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{ |
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return [ |
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'Substring' => 'substring \\( ((?&String)) , ((?&Attribute)|(?&Math)|(?&Number)) (?:, ((?&Attribute)|(?&Math)|(?&Number)))? \\)' |
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]; |
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} |
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/** |
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* Convert a substring() function call |
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* |
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* @param string $exprString |
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* @param string $exprPos |
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* @param string $exprLen |
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* @return string |
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*/ |
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public function convertSubstring($exprString, $exprPos, $exprLen = null) |
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{ |
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// Try to fix negative lengths when possible |
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if (is_numeric($exprPos) && is_numeric($exprLen) && $exprPos < 1) |
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{ |
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$exprLen += $exprPos - 1; |
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} |
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$args = []; |
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$args[] = $this->convert($exprString); |
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$args[] = $this->convertPos($exprPos); |
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$args[] = (isset($exprLen)) ? $this->convertLen($exprLen) : 'null'; |
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$args[] = "'utf-8'"; |
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return 'mb_substr(' . implode(',', $args) . ')'; |
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} |
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/** |
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* Convert the length expression of a substring() call |
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* |
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* @param string $expr |
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* @return string |
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*/ |
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protected function convertLen($expr) |
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{ |
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// NOTE: negative values for the second argument do not produce the same result as |
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// specified in XPath if the argument is not a literal number |
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if (is_numeric($expr)) |
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{ |
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return (string) max(0, $expr); |
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} |
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return 'max(0,' . $this->convert($expr) . ')'; |
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} |
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/** |
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* Convert the position expression of a substring() call |
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* |
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* @param string $expr |
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* @return string |
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*/ |
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protected function convertPos($expr) |
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{ |
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if (is_numeric($expr)) |
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{ |
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return (string) max(0, $expr - 1); |
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} |
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return 'max(0,' . $this->convert($expr) . '-1)'; |
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} |
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} |
s9e /
TextFormatter
