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<?php |
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declare(strict_types=1); |
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namespace TYPO3Fluid\Fluid\ViewHelpers\Expression; |
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/* |
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* This file belongs to the package "TYPO3 Fluid". |
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* See LICENSE.txt that was shipped with this package. |
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*/ |
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use TYPO3Fluid\Fluid\Component\ExpressionComponentInterface; |
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use TYPO3Fluid\Fluid\Core\Parser\Exception; |
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use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface; |
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use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper; |
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/** |
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* Math Expression ViewHelper, seconds as expression type |
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*/ |
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class MathViewHelper extends AbstractViewHelper implements ExpressionComponentInterface |
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{ |
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protected $parts = []; |
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/** |
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* Possible operators, sorted by likely frequency of use to make |
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* the strpos() check work as fast as possible for the most common |
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* use cases. |
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* |
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* @var string |
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*/ |
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protected static $operators = '+-*/%^'; |
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public function __construct(iterable $parts = []) |
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{ |
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$this->parts = $parts; |
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} |
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protected function initializeArguments() |
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{ |
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$this->registerArgument('a', 'mixed', 'Numeric first value to calculate', true); |
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$this->registerArgument('b', 'mixed', 'Numeric first value to calculate', true); |
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$this->registerArgument('operator', 'string', 'Operator to use, e.g. +, -, %', true); |
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} |
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public static function matches(array $parts): bool |
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{ |
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return isset($parts[2]) && strpos(static::$operators, $parts[1]) !== false; |
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} |
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public function evaluate(RenderingContextInterface $renderingContext) |
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{ |
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$arguments = $this->getArguments()->setRenderingContext($renderingContext)->getArrayCopy(); |
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$parts = empty($this->parts) ? [$arguments['a'], $arguments['operator'], $arguments['b']] : $this->parts; |
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$variable = array_shift($parts); |
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$result = $renderingContext->getVariableProvider()->get($variable) ?? $variable; |
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$operator = null; |
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$operators = str_split(static::$operators); |
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foreach ($parts as $part) { |
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if (in_array($part, $operators, true)) { |
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$operator = $part; |
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} else { |
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$part = $renderingContext->getVariableProvider()->get($part) ?? $part; |
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if (!is_string($operator)) { |
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throw new Exception( |
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sprintf( |
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'Invalid operator type (%s) given, it must be a valid string, e.g. "+" or "-"!', |
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gettype($operator) |
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), |
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1561121432 |
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); |
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} |
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$result = self::evaluateOperation($result, $operator, $part); |
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} |
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} |
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return $result + 0; |
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} |
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/** |
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* @param integer|float $left |
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* @param string $operator |
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* @param integer|float $right |
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* @return integer|float |
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*/ |
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protected static function evaluateOperation($left, string $operator, $right) |
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{ |
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if (!is_numeric($left)) { |
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$left = 0; |
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} |
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if (!is_numeric($right)) { |
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$right = 0; |
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} |
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if ($operator === '%') { |
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return $left % $right; |
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} elseif ($operator === '-') { |
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return $left - $right; |
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} elseif ($operator === '+') { |
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return $left + $right; |
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} elseif ($operator === '*') { |
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return $left * $right; |
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} elseif ($operator === '/') { |
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return (integer) $right !== 0 ? $left / $right : 0; |
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} elseif ($operator === '^') { |
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return pow($left, $right); |
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} |
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return 0; |
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} |
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} |
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TYPO3 /
Fluid
