MDL-44357 theme: Allow core to compile LESS in PHP

lib/lessphp/Tree/Keyword.php

@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Keyword
+ *
+ * @package Less
+ * @subpackage tree
+ */
+class Less_Tree_Keyword extends Less_Tree{
+
+	public $value;
+	public $type = 'Keyword';
+
+	/**
+	 * @param string $value
+	 */
+	public function __construct($value){
+		$this->value = $value;
+	}
+
+	public function compile(){
+		return $this;
+	}
+
+    /**
+     * @see Less_Tree::genCSS
+     */
+	public function genCSS( $output ){
+
+		if( $this->value === '%') {
+			throw new Less_Exception_Compiler("Invalid % without number");
+		}
+
+		$output->add( $this->value );
+	}
+
+	public function compare($other) {
+		if ($other instanceof Less_Tree_Keyword) {
+			return $other->value === $this->value ? 0 : 1;
+		} else {
+			return -1;
+		}
+	}
+}