Add a throws_exceptions constructor option.

This allows overriding strictness without subclassing. Closes #64.

Mustache.php

@@ -94,6 +94,15 @@ class Mustache {
 	 *         'pragmas' => array(
 	 *             Mustache::PRAGMA_UNESCAPED => true
 	 *         ),
+	 *
+	 *         // an array of thrown exceptions to enable/disable
+	 *         'throws_exceptions' => array(
+	 *             MustacheException::UNKNOWN_VARIABLE         => false,
+	 *             MustacheException::UNCLOSED_SECTION         => true,
+	 *             MustacheException::UNEXPECTED_CLOSE_SECTION => true,
+	 *             MustacheException::UNKNOWN_PARTIAL          => false,
+	 *             MustacheException::UNKNOWN_PRAGMA           => true,
+	 *         ),
 	 *     );
 	 *
 	 * @access public
@@ -139,6 +148,12 @@ class Mustache {
 			}
 			$this->_pragmas = $options['pragmas'];
 		}
+
+		if (isset($options['throws_exceptions'])) {
+			foreach ($options['throws_exceptions'] as $exception => $value) {
+				$this->_throwsExceptions[$exception] = $value;
+			}
+		}
 	}
 
 	/**

test/MustacheExceptionTest.php

@@ -91,6 +91,34 @@ class MustacheExceptionTest extends PHPUnit_Framework_TestCase {
 		$mustache = new TestableMustache();
 		$mustache->testableGetPragmaOptions('PRAGMATIC');
 	}
+
+	public function testOverrideThrownExceptionsViaConstructorOptions() {
+		$exceptions = array(
+			MustacheException::UNKNOWN_VARIABLE,
+			MustacheException::UNCLOSED_SECTION,
+			MustacheException::UNEXPECTED_CLOSE_SECTION,
+			MustacheException::UNKNOWN_PARTIAL,
+			MustacheException::UNKNOWN_PRAGMA,
+		);
+
+		$one = new TestableMustache(null, null, null, array(
+			'throws_exceptions' => array_fill_keys($exceptions, true)
+		));
+
+		$thrownExceptions = $one->getThrownExceptions();
+		foreach ($exceptions as $exception) {
+			$this->assertTrue($thrownExceptions[$exception]);
+		}
+
+		$two = new TestableMustache(null, null, null, array(
+			'throws_exceptions' => array_fill_keys($exceptions, false)
+		));
+
+		$thrownExceptions = $two->getThrownExceptions();
+		foreach ($exceptions as $exception) {
+			$this->assertFalse($thrownExceptions[$exception]);
+		}
+	}
 }
 
 class PickyMustache extends Mustache {
@@ -117,4 +145,8 @@ class TestableMustache extends Mustache {
 	public function testableGetPragmaOptions($pragma_name) {
 		return $this->_getPragmaOptions($pragma_name);
 	}
+
+	public function getThrownExceptions() {
+		return $this->_throwsExceptions;
+	}
 }