Inline `isCallable` and `isTruthy` into compiled templates

~3-5% performance gain.

src/Mustache/Compiler.php

@@ -140,14 +140,14 @@ class Compiler {
 
 	const SECTION = '
 		private function section%s(\Mustache\Buffer $buffer, \Mustache\Context $context, $value) {
-			if ($context->isCallable($value)) {
+			if (!is_string($value) && is_callable($value)) {
 				$source = %s;
 				$buffer->write(
 					$this->mustache
 						->loadLambda((string) call_user_func($value, $source)%s)
 						->renderInternal($context, $buffer->getIndent())
 				);
-			} elseif ($context->isTruthy($value)) {
+			} elseif (!empty($value)) {
 				$values = $context->isIterable($value) ? $value : array($value);
 				foreach ($values as $value) {
 					$context->push($value);%s
@@ -191,7 +191,8 @@ class Compiler {
 
 	const INVERTED_SECTION = '
 		// %s inverted section
-		if (!$context->isTruthy($context->%s(%s))) {
+		$value = $context->%s(%s);
+		if (empty($value)) {
 			%s
 		}';
 
@@ -232,7 +233,7 @@ class Compiler {
 
 	const VARIABLE = '
 		$value = $context->%s(%s);
-		if ($context->isCallable($value)) {
+		if (!is_string($value) && is_callable($value)) {
 			$value = $this->mustache
 				->loadLambda((string) call_user_func($value))
 				->renderInternal($context, $buffer->getIndent());

src/Mustache/Context.php

@@ -28,36 +28,6 @@ class Context {
 		}
 	}
 
-	/**
-	 * Helper function to test whether a value is 'truthy'.
-	 *
-	 * @param mixed $value
-	 *
-	 * @return boolean True if the value is 'truthy'
-	 */
-	public function isTruthy($value) {
-		return !empty($value);
-	}
-
-	/**
-	 * Higher order sections helper: tests whether a value is a valid callback.
-	 *
-	 * In Mustache.php, a variable is considered 'callable' if the variable is:
-	 *
-	 *  1. An anonymous function.
-	 *  2. An object and the name of a public function, e.g. `array($someObject, 'methodName')`
-	 *  3. A class name and the name of a public static function, e.g. `array('SomeClass', 'methodName')`
-	 *
-	 * Note that this specifically excludes strings, which PHP would normally consider 'callable'.
-	 *
-	 * @param mixed $value
-	 *
-	 * @return boolean True if the value is 'callable'
-	 */
-	public function isCallable($value) {
-		return !is_string($value) && is_callable($value);
-	}
-
 	/**
 	 * Tests whether a value should be iterated over (e.g. in a section context).
 	 *

test/Mustache/Test/ContextTest.php

@@ -36,57 +36,6 @@ class ContextTest extends \PHPUnit_Framework_TestCase {
 		$this->assertEquals('NAME', $three->find('name'));
 	}
 
-	public function testIsTruthy() {
-		$context = new Context;
-
-		$this->assertTrue($context->isTruthy('string'));
-		$this->assertTrue($context->isTruthy(new \StdClass));
-		$this->assertTrue($context->isTruthy(1));
-		$this->assertTrue($context->isTruthy(array('a', 'b')));
-
-		$this->assertFalse($context->isTruthy(null));
-		$this->assertFalse($context->isTruthy(''));
-		$this->assertFalse($context->isTruthy(0));
-		$this->assertFalse($context->isTruthy(array()));
-	}
-
-	public function testIsCallable() {
-		$dummy   = new TestDummy;
-		$context = new Context;
-
-		$this->assertTrue($context->isCallable(function() {
-			return null;
-		}));
-		$this->assertTrue($context->isCallable(array('\Mustache\Test\TestDummy', 'foo')));
-		$this->assertTrue($context->isCallable(array($dummy, 'bar')));
-		$this->assertTrue($context->isCallable($dummy));
-
-		$this->assertFalse($context->isCallable('count'));
-		$this->assertFalse($context->isCallable('TestDummy::foo'));
-		$this->assertFalse($context->isCallable(array('\Mustache\Test\TestDummy', 'name')));
-		$this->assertFalse($context->isCallable(array('NotReallyAClass', 'foo')));
-		$this->assertFalse($context->isCallable(array($dummy, 'name')));
-	}
-
-	/**
-	 * @dataProvider getIterables
-	 */
-	public function testIsIterable($value, $iterable) {
-		$context = new Context;
-		$this->assertEquals($iterable, $context->isIterable($value));
-	}
-
-	public function getIterables() {
-		return array(
-			array(array(0 => 'a', 1 => 'b'), true),
-			array(array(0 => 'a', 2 => 'b'), false),
-			array(array(1 => 'a', 2 => 'b'), false),
-			array(array('a' => 0, 'b' => 1), false),
-			array('some string',             false),
-			array(new \ArrayIterator,        true),
-		);
-	}
-
 	public function testPushPopAndLast() {
 		$context = new Context;
 		$this->assertFalse($context->last());