Add Packager_Builder::reduce to select fewer modules (without using P…

…ackager for the whole analyzation again

lib/Builder.php

@@ -67,7 +67,7 @@ public function output($glue = "\n\n"){
 
 	/**
 	 * Concatenates the files by Package
-	 * 
+	 *
 	 * @param string $glue optional The glue which joins the code of the different modules together
 	 */
 	public function outputByPackage($glue = "\n\n"){
@@ -118,4 +118,26 @@ static public function fromJSON($json){
 		return new self(json_decode($json, true));
 	}
 
+	/**
+	 * Reduces the number of modules to the given ids and their dependencies
+	 *
+	 * @param array $ids
+	 * @return Packager_Builder
+	 */
+	public function reduce(array $ids, $_oldmodules = null){
+		if (!$_oldmodules){
+			$_oldmodules = $this->_modules;
+			$this->_modules = array();
+		}
+		$this->_reduce($ids, $_oldmodules);
+		return $this;
+	}
+
+	protected function _reduce($ids, $old){
+		foreach ($ids as $id) if (isset($old[$id]) && !isset($this->_modules[$id])){
+			$this->_modules[$id] = $old[$id];
+			$this->reduce($this->_modules[$id]['dependencies'], $old);
+		}
+	}
+
 }

test/php/BuilderTest.php

@@ -173,4 +173,16 @@ public function testSerialization(){
 
 	}
 
+	public function testReduce(){
+
+		$packager = new Packager;
+		$packager->setBaseUrl($this->fixtures);
+		$builder = $packager->req(array('basic/three'));
+
+		$builder->reduce(array('basic/two'));
+
+		$this->assertEquals(array('basic/two', 'basic/one'), $builder->modules());
+
+	}
+
 }