Initial commit

typo3conf/ext/vhs/Classes/ViewHelpers/Math/AbstractMultipleMathViewHelper.php

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+<?php
+namespace FluidTYPO3\Vhs\ViewHelpers\Math;
+
+/*
+ * This file is part of the FluidTYPO3/Vhs project under GPLv2 or later.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.md file that was distributed with this source code.
+ */
+
+use FluidTYPO3\Vhs\Traits\ArrayConsumingViewHelperTrait;
+use TYPO3\CMS\Fluid\Core\ViewHelper\Exception;
+
+/**
+ * Base class: Math ViewHelpers operating on one number or an
+ * array of numbers.
+ *
+ * @author Claus Due <claus@namelesscoder.net>
+ * @package Vhs
+ * @subpackage ViewHelpers
+ */
+abstract class AbstractMultipleMathViewHelper extends AbstractSingleMathViewHelper {
+
+	use ArrayConsumingViewHelperTrait;
+
+	/**
+	 * @return void
+	 */
+	public function initializeArguments() {
+		parent::initializeArguments();
+		$this->registerArgument('b', 'mixed', 'Second number or Iterator/Traversable/Array for calculation', TRUE);
+	}
+
+	/**
+	 * @return mixed
+	 * @throw Exception
+	 */
+	public function render() {
+		$a = $this->getInlineArgument();
+		$b = $this->arguments['b'];
+		return $this->calculate($a, $b);
+	}
+
+	/**
+	 * @param mixed $a
+	 * @param mixed $b
+	 * @return mixed
+	 * @throws Exception
+	 */
+	protected function calculate($a, $b) {
+		if ($b === NULL) {
+			throw new Exception('Required argument "b" was not supplied', 1237823699);
+		}
+		$aIsIterable = $this->assertIsArrayOrIterator($a);
+		$bIsIterable = $this->assertIsArrayOrIterator($b);
+		if (TRUE === $aIsIterable) {
+			$a = $this->arrayFromArrayOrTraversableOrCSV($a);
+			foreach ($a as $index => $value) {
+				$bSideValue = TRUE === $bIsIterable ? $b[$index] : $b;
+				$a[$index] = $this->calculateAction($value, $bSideValue);
+			}
+			return $a;
+		} elseif (TRUE === $bIsIterable) {
+			// condition matched if $a is not iterable but $b is.
+			throw new Exception('Math operation attempted using an iterator $b against a numeric value $a. Either both $a and $b, or only $a, must be array/Iterator', 1351890876);
+		}
+		return $this->calculateAction($a, $b);
+	}
+
+}