Initial commit

typo3conf/ext/vhs/Classes/ViewHelpers/Condition/Variable/IsNullViewHelper.php

@@ -0,0 +1,46 @@
+<?php
+namespace FluidTYPO3\Vhs\ViewHelpers\Condition\Variable;
+
+/*
+ * 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 TYPO3\CMS\Fluid\Core\ViewHelper\AbstractConditionViewHelper;
+use FluidTYPO3\Vhs\Traits\ConditionViewHelperTrait;
+
+/**
+ * ### Condition: Value is NULL
+ *
+ * Condition ViewHelper which renders the `then` child if provided
+ * value is NULL.
+ *
+ * @author Björn Fromme <fromme@dreipunktnull.com>, dreipunktnull
+ * @package Vhs
+ * @subpackage ViewHelpers\If\Var
+ */
+class IsNullViewHelper extends AbstractConditionViewHelper {
+
+	use ConditionViewHelperTrait;
+
+	/**
+	 * Initialize arguments
+	 */
+	public function initializeArguments() {
+		parent::initializeArguments();
+		$this->registerArgument('value', 'string', 'value to check', TRUE);
+	}
+
+	/**
+	 * This method decides if the condition is TRUE or FALSE. It can be overriden in extending viewhelpers to adjust functionality.
+	 *
+	 * @param array $arguments ViewHelper arguments to evaluate the condition for this ViewHelper, allows for flexiblity in overriding this method.
+	 * @return bool
+	 */
+	static protected function evaluateCondition($arguments = NULL) {
+		return NULL === $arguments['value'];
+	}
+
+}

typo3conf/ext/vhs/Classes/ViewHelpers/Condition/Variable/IssetViewHelper.php

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+<?php
+namespace FluidTYPO3\Vhs\ViewHelpers\Condition\Variable;
+
+/*
+ * 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 TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;
+use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractConditionViewHelper;
+use FluidTYPO3\Vhs\Traits\ConditionViewHelperTrait;
+
+/**
+ * ### Variable: Isset
+ *
+ * Renders the `then` child if the variable name given in
+ * the `name` argument exists in the template. The value
+ * can be zero, NULL or an empty string - but the ViewHelper
+ * will still return TRUE if the variable exists.
+ *
+ * Combines well with dynamic variable names:
+ *
+ *     <!-- if {variableContainingVariableName} is "foo" this checks existence of {foo} -->
+ *     <v:condition.variable.isset name="{variableContainingVariableName}">...</v:condition.variable.isset>
+ *     <!-- if {suffix} is "Name" this checks existence of "variableName" -->
+ *     <v:condition.variable.isset name="variable{suffix}">...</v:condition.variable.isset>
+ *     <!-- outputs value of {foo} if {bar} is defined -->
+ *     {foo -> v:condition.variable.isset(name: bar)}
+ *
+ * @author Claus Due <claus@namelesscoder.net>
+ * @package Vhs
+ * @subpackage ViewHelpers\Condition\Variable
+ */
+class IssetViewHelper extends AbstractConditionViewHelper {
+
+	use ConditionViewHelperTrait;
+
+	/**
+	 * Initialize arguments
+	 */
+	public function initializeArguments() {
+		parent::initializeArguments();
+		$this->registerArgument('name', 'string', 'name of the variable', TRUE);
+	}
+	/**
+ 	 * Render
+ 	 *
+ 	 * @return string
+ 	 */
+ 	public function render() {
+		return static::renderStatic(
+			$this->arguments,
+			$this->buildRenderChildrenClosure(),
+			$this->renderingContext
+		);
+	}
+
+	/**
+	 * Default implementation for use in compiled templates
+	 *
+	 * @param array $arguments
+	 * @param \Closure $renderChildrenClosure
+	 * @param \TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface $renderingContext
+	 * @return mixed
+	 */
+	static public function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext) {
+		$hasEvaluated = TRUE;
+
+		if (TRUE === $renderingContext->getTemplateVariableContainer()->exists($arguments['name'])) {
+			$result = static::renderStaticThenChild($arguments, $hasEvaluated);
+			if ($hasEvaluated) {
+				return $result;
+			}
+
+			return $renderChildrenClosure();
+		} else {
+			$result = static::renderStaticElseChild($arguments, $hasEvaluated);
+			if ($hasEvaluated) {
+				return $result;
+			}
+		}
+
+		return '';
+	}
+
+}