Mutate only methods, no functions

README.md

@@ -451,6 +451,9 @@ Humbug implements a basic suite of Mutators, which essentially tells us when a
 particular PHP token can be mutated, and also apply that mutation to an array
 of tokens.
 
+Note: Source code held within functions (rather than class methods) is not mutated
+at this time.
+
 Binary Arithmetic:
 
 | Original | Mutated | Original | Mutated |

features/bootstrap/FeatureContext.php

@@ -106,7 +106,7 @@ public function iShouldSee(PyStringNode $string)
      */
     public function iShouldSeeContaining(PyStringNode $string)
     {
-        if (!preg_match('/' . preg_quote((string) $string) . '/', $this->appTester->getDisplay())) {
+        if (!preg_match('/' . preg_quote((string) $string, '/') . '/', $this->appTester->getDisplay())) {
             throw new \RuntimeException(sprintf(
                 'Output did not match expected pattern:%s%s', PHP_EOL, $this->appTester->getDisplay()
             ));

features/running/developer_sees_mutant_error_result.feature

@@ -24,7 +24,7 @@ Feature: Use Humbug
                     $foo = new Foo;
                     $r = $foo->add(2, 1);
                     // emulate error
-                    if ($r !== 3) $foo->bar();
+                    if ($r !== 3) require __DIR__ . '/this.does.not.exist.xyz'; 
                     $this->assertEquals(3, $r);
                 }
             }

features/version.feature

@@ -6,7 +6,7 @@ Feature: Developer runs Humbug with --version option
     Scenario: View Humbug version
         Given I am in any directory
         When I run humbug with "--version"
-        Then I should see:
+        Then I should see output containing:
             """
              _  _            _
             | || |_  _ _ __ | |__ _  _ __ _

src/Mutable.php

@@ -146,7 +146,7 @@ public function generate()
             }
 
             //TODO: handle whitespace!
-            if (is_array($token) && $token[0] == T_FUNCTION) {
+            if (is_array($token) && $token[0] == T_FUNCTION && '???' !== $className) {
                 if (!isset($tokens[$index+2][1])) {
                     continue; // ignore closure
                 }