diff --git a/.travis.yml b/.travis.yml
index 959203f..990b973 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,8 +16,8 @@ install:
 script:
 - composer validate
 - vendor/bin/phpcs
+- "vendor/bin/phpmd ./ text cleancode,codesize,controversial,design,naming,unusedcode --exclude vendor/"
 - "./bin/php-doc-check -d ./ --exclude vendor/"
-- ls .travis/
 - vendor/bin/box build
 - "php ./bin/php-doc-check.phar -d ./ --exclude vendor/"
 before_deploy:
diff --git a/composer.json b/composer.json
index 0c33cc7..79da27d 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,7 @@
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^3.4",
-        "kherge/box": "~2.0"
+        "kherge/box": "~2.0",
+        "phpmd/phpmd": "^2.6"
     }
 }
diff --git a/src/AnalysableFile.php b/src/AnalysableFile.php
index 78e3db0..0267e50 100644
--- a/src/AnalysableFile.php
+++ b/src/AnalysableFile.php
@@ -3,8 +3,8 @@
 
 class AnalysableFile
 {
-    public $has_errors = false;
-    public $has_warnings = false;
+    public $hasErrors = false;
+    public $hasWarnings = false;
     public $findings = array();
 
     public function __construct(\SplFileInfo $file, \PhpParser\Parser $parser, $arguments)
@@ -19,7 +19,7 @@ public function analyse()
         try {
             $statements = $this->parser->parse(file_get_contents($this->file->getRealPath()));
         } catch (\PhpParser\Error $e) {
-            $this->has_errors = true;
+            $this->hasErrors = true;
             $this->findings[] = new \NdB\PhpDocCheck\Findings\Error(
                 sprintf('Failed parsing: %s', $e->getRawMessage()),
                 $e->getStartLine()
@@ -37,9 +37,9 @@ public function analyse()
      */
     public function getProgressIndicator() : string
     {
-        if (!$this->has_warnings && !$this->has_errors) {
+        if (!$this->hasWarnings && !$this->hasErrors) {
             return '.';
-        } elseif (!$this->has_errors) {
+        } elseif (!$this->hasErrors) {
             return 'W';
         }
         return 'E';
diff --git a/src/NodeVisitor.php b/src/NodeVisitor.php
index f92d6c8..238781d 100644
--- a/src/NodeVisitor.php
+++ b/src/NodeVisitor.php
@@ -7,6 +7,23 @@
 
 class NodeVisitor extends \PhpParser\NodeVisitorAbstract
 {
+    const COMPLEX_NODES = array(
+        'PhpParser\Node\Stmt\If_',
+        'PhpParser\Node\Stmt\ElseIf_',
+        'PhpParser\Node\Stmt\For_',
+        'PhpParser\Node\Stmt\Foreach_',
+        'PhpParser\Node\Stmt\While_',
+        'PhpParser\Node\Stmt\Do_',
+        'PhpParser\Node\Expr\BinaryOp\LogicalAnd',
+        'PhpParser\Node\Expr\BinaryOp\LogicalOr',
+        'PhpParser\Node\Expr\BinaryOp\LogicalXor',
+        'PhpParser\Node\Expr\BinaryOp\BooleanAnd',
+        'PhpParser\Node\Expr\BinaryOp\BooleanOr',
+        'PhpParser\Node\Stmt\Catch_',
+        'PhpParser\Node\Expr\Ternary',
+        'PhpParser\Node\Expr\BinaryOp\Coalesce',
+    );
+
     public function __construct(AnalysableFile &$file)
     {
         $this->file =& $file;
@@ -27,13 +44,13 @@ public function leaveNode(\PhpParser\Node $node)
             }
             if (empty($node->getDocComment())) {
                 if ($methodCcn >= $this->file->arguments['complexity-error-treshold']) {
-                    $this->file->has_errors = true;
+                    $this->file->hasErrors = true;
                     $this->file->findings[] = new \NdB\PhpDocCheck\Findings\Error(
                         sprintf("%s has no documentation and a complexity of %d", $name, $methodCcn),
                         $node->getStartLine()
                     );
                 } elseif ($methodCcn >= $this->file->arguments['complexity-warning-treshold']) {
-                    $this->file->has_warnings = true;
+                    $this->file->hasWarnings = true;
                     $this->file->findings[] = new \NdB\PhpDocCheck\Findings\Warning(
                         sprintf("%s has no documentation and a complexity of %d", $name, $methodCcn),
                         $node->getStartLine()
@@ -49,30 +66,17 @@ public function leaveNode(\PhpParser\Node $node)
     protected function calculateComplexity($node)
     {
         $ccn = 0;
-        foreach (get_object_vars($node) as $name => $member) {
+        foreach (get_object_vars($node) as $member) {
             foreach (is_array($member) ? $member : [$member] as $memberItem) {
                 if ($memberItem instanceof Node) {
                     $ccn += $this->calculateComplexity($memberItem);
                 }
             }
         }
+        if (in_array(get_class($node), self::COMPLEX_NODES)) {
+            $ccn++;
+        }
         switch (true) {
-            case $node instanceof Stmt\If_:
-            case $node instanceof Stmt\ElseIf_:
-            case $node instanceof Stmt\For_:
-            case $node instanceof Stmt\Foreach_:
-            case $node instanceof Stmt\While_:
-            case $node instanceof Stmt\Do_:
-            case $node instanceof Node\Expr\BinaryOp\LogicalAnd:
-            case $node instanceof Node\Expr\BinaryOp\LogicalOr:
-            case $node instanceof Node\Expr\BinaryOp\LogicalXor:
-            case $node instanceof Node\Expr\BinaryOp\BooleanAnd:
-            case $node instanceof Node\Expr\BinaryOp\BooleanOr:
-            case $node instanceof Stmt\Catch_:
-            case $node instanceof Node\Expr\Ternary:
-            case $node instanceof Node\Expr\BinaryOp\Coalesce:
-                $ccn++;
-                break;
             case $node instanceof Stmt\Case_: // include default
                 if ($node->cond !== null) { // exclude default
                     $ccn++;
diff --git a/src/Output/AbstractOutput.php b/src/Output/AbstractOutput.php
index bf9a303..e66671e 100644
--- a/src/Output/AbstractOutput.php
+++ b/src/Output/AbstractOutput.php
@@ -20,7 +20,7 @@ public function display()
     public function getExitCode()
     {
         foreach ($this->files as $file) {
-            if ($file->has_errors || $file->has_warnings) {
+            if ($file->hasErrors || $file->hasWarnings) {
                 return 1;
             }
         }