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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2016 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\TemplateNormalizations; |
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use DOMDocument; |
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use DOMXPath; |
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class FoldArithmeticConstants extends AbstractConstantFolding |
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{ |
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/** |
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* @var DOMXPath |
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*/ |
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protected $xpath; |
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/** |
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* Constructor |
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*/ |
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public function __construct() |
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{ |
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$this->xpath = new DOMXPath(new DOMDocument); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function getOptimizationPasses() |
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{ |
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return [ |
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'(^[-+0-9\\s]+$)' => 'foldOperation', |
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'( \\+ 0(?! [^+\\)])|(?<![-\\w])0 \\+ )' => 'foldAdditiveIdentity', |
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'(^((?>\\d+ [-+] )*)(\\d+) div (\\d+))' => 'foldDivision', |
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'(^((?>\\d+ [-+] )*)(\\d+) \\* (\\d+))' => 'foldMultiplication', |
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'(\\( \\d+ (?>(?>[-+*]|div) \\d+ )+\\))' => 'foldSubExpression', |
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'((?<=[-+*\\(]|\\bdiv|^) \\( ([@$][-\\w]+|\\d+(?>\\.\\d+)?) \\) (?=[-+*\\)]|div|$))' => 'removeParentheses' |
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]; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function evaluateExpression($expr) |
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{ |
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$expr = preg_replace_callback( |
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'(([\'"])(.*?)\\1)s', |
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function ($m) |
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{ |
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return $m[1] . bin2hex($m[2]) . $m[1]; |
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}, |
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$expr |
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); |
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$expr = parent::evaluateExpression($expr); |
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$expr = preg_replace_callback( |
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'(([\'"])(.*?)\\1)s', |
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function ($m) |
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{ |
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return $m[1] . hex2bin($m[2]) . $m[1]; |
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}, |
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$expr |
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); |
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return $expr; |
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} |
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/** |
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* Remove "+ 0" additions |
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* |
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* @param array $m |
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* @return string |
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*/ |
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protected function foldAdditiveIdentity(array $m) |
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{ |
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return ''; |
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} |
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/** |
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* Evaluate and return the result of a division |
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* |
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* @param array $m |
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* @return string |
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*/ |
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protected function foldDivision(array $m) |
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{ |
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return $m[1] . ($m[2] / $m[3]); |
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} |
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/** |
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* Evaluate and return the result of a multiplication |
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* |
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* @param array $m |
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* @return string |
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*/ |
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protected function foldMultiplication(array $m) |
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{ |
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return $m[1] . ($m[2] * $m[3]); |
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} |
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/** |
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* Evaluate and replace a constant operation |
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* |
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* @param array $m |
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* @return string |
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*/ |
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protected function foldOperation(array $m) |
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{ |
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return (string) $this->xpath->evaluate($m[0]); |
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} |
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/** |
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* Evaluate and return the result of a simple subexpression |
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* |
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* @param array $m |
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* @return string |
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*/ |
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protected function foldSubExpression(array $m) |
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{ |
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return '(' . $this->evaluateExpression(trim(substr($m[0], 1, -1))) . ')'; |
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} |
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/** |
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* Remove the parentheses around an integer |
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* |
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* @param array $m |
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* @return string |
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*/ |
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protected function removeParentheses(array $m) |
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{ |
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return ' ' . $m[1] . ' '; |
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} |
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} |
s9e /
TextFormatter
