Merge pull request #199 from thisispiers/master

add “constant()” TSSFunction

src/Module/Functions.php

@@ -21,6 +21,7 @@ public function load(\Transphporm\Config $config) {
 		$templateFunction = new \Transphporm\TSSFunction\Template($config->getElementData(), $config->getCssToXpath(), $baseDir);
 		$functionSet->addFunction('template', $templateFunction);
 		$functionSet->addFunction('json', new \Transphporm\TSSFunction\Json($baseDir));
+        $functionSet->addFunction('constant', new \Transphporm\TSSFunction\Constant());
 
 		// Register HTML formatter here because it uses the template function
 		$config->registerFormatter(new \Transphporm\Formatter\HTMLFormatter($templateFunction));

src/TSSFunction/Constant.php

@@ -0,0 +1,17 @@
+<?php
+/* @description     Transformation Style Sheets - Revolutionising PHP templating    *
+ * @author          Tom Butler tom@r.je                                             *
+ * @copyright       2017 Tom Butler <tom@r.je> | https://r.je/                      *
+ * @license         http://www.opensource.org/licenses/bsd-license.php  BSD License *
+ * @version         1.2                                                             */
+namespace Transphporm\TSSFunction;
+/* Handles constant() function in the TSS stlyesheet */
+class Constant implements \Transphporm\TSSFunction {
+	public function run(array $args, \DomElement $element) {
+		$const_name = strtoupper(trim($args[0]));
+		if (!defined($const_name)) {
+			throw new \Exception($const_name . ' is not a defined constant');
+		}
+		return constant($const_name);
+	}
+}

tests/TransphpormTest.php

@@ -494,6 +494,34 @@ public function testWriteAttributeParamFromData() {
 		$this->assertEquals('<div class="classname">Test</div>', $template->output("class")->body);
 	}
 
+    public function testReadConstant() {
+        $template = '
+            <div>Test</div>
+        ';
+
+        $tss = 'div {content: constant(MY_CONSTANT); }';
+
+        define('MY_CONSTANT', 'constant value');
+        $template = new \Transphporm\Builder($template, $tss);
+
+        $this->assertEquals('<div class="MY_CONSTANT">constant value</div>', $template->output()->body);
+    }
+
+
+
+    public function testReadConstantFromAttribute() {
+        $template = '
+            <input name="foo" data-value="MY_ATTR_CONSTANT" />
+        ';
+
+        $tss = 'input:attr(value) {content: constant(attr(data-value)); }';
+
+        define('MY_ATTR_CONSTANT', 'attr constant value');
+        $template = new \Transphporm\Builder($template, $tss);
+
+        $this->assertEquals('<input name="foo" data-value="MY_ATTR_CONSTANT" value="attr constant value">', $template->output()->body);
+    }
+
 	public function testComments() {
 			$template = '
 			<div>Test</div>