[bin] Handle duplicate class names or aliases in same namespace.

This condition can occur when merging multiple class files (with their
own independent "use" directives) in one big file: when imported class
names or aliases clashes, the script now tries to automatically rename
them by defining a new alias in the "use" directive and renaming the
occurences in the buffer containing the class code.

This fix is naive at best, but seems to work fine so we will just live
with it for now.

bin/create-single-file.php

@@ -326,10 +326,10 @@ class PhpUseDirectives implements Countable, IteratorAggregate
 
     public function __construct(PhpNamespace $namespace)
     {
+        $this->namespace = $namespace;
         $this->use = array();
         $this->aliases = array();
         $this->reverseAliases = array();
-        $this->namespace = $namespace;
     }
 
     public function add($use, $as = null)
@@ -338,12 +338,35 @@ class PhpUseDirectives implements Countable, IteratorAggregate
             return;
         }
 
+        $rename = null;
         $this->use[] = $use;
-        $this->aliases[$as ?: PhpClass::extractName($use)] = $use;
+        $aliasedClassName = $as ?: PhpClass::extractName($use);
+
+        if (isset($this->aliases[$aliasedClassName])) {
+            $parentNs = $this->getParentNamespace();
+
+            if ($parentNs && false !== $pos = strrpos($parentNs, '\\')) {
+                $parentNs = substr($parentNs, $pos);
+            }
+
+            $newAlias = "{$parentNs}_{$aliasedClassName}";
+            $rename = (object) array(
+                'namespace' => $this->namespace,
+                'from' => $aliasedClassName,
+                'to' => $newAlias,
+            );
+
+            $this->aliases[$newAlias] = $use;
+            $as = $newAlias;
+        } else {
+            $this->aliases[$aliasedClassName] = $use;
+        }
 
         if ($as !== null) {
             $this->reverseAliases[$use] = $as;
         }
+
+        return $rename;
     }
 
     public function getList()
@@ -376,6 +399,15 @@ class PhpUseDirectives implements Countable, IteratorAggregate
         return $this->namespace;
     }
 
+    public function getParentNamespace()
+    {
+        if (false !== $pos = strrpos($this->namespace, '\\')) {
+            return substr($this->namespace, 0, $pos);
+        }
+
+        return '';
+    }
+
     public function getFQN($className)
     {
         if (($nsSepFirst = strpos($className, '\\')) === false) {
@@ -442,16 +474,19 @@ LICENSE;
 
     private function extractData()
     {
+        $renames = array();
         $useDirectives = $this->getNamespace()->getUseDirectives();
 
-        $useExtractor = function ($m) use ($useDirectives) {
+        $useExtractor = function ($m) use ($useDirectives, &$renames) {
             array_shift($m);
 
             if (isset($m[1])) {
                 $m[1] = str_replace(" as ", '', $m[1]);
             }
 
-            call_user_func_array(array($useDirectives, 'add'), $m);
+            if ($rename = call_user_func_array(array($useDirectives, 'add'), $m)) {
+                $renames[] = $rename;
+            }
         };
 
         $classBuffer = stream_get_contents(fopen($this->getFile()->getPathname(), 'r'));
@@ -463,6 +498,10 @@ LICENSE;
         $classBuffer = preg_replace('/namespace\s+[\w\d_\\\\]+;\s?/', '', $classBuffer);
         $classBuffer = preg_replace_callback('/use\s+([\w\d_\\\\]+)(\s+as\s+.*)?;\s?\n?/', $useExtractor, $classBuffer);
 
+        foreach ($renames as $rename) {
+            $classBuffer = str_replace($rename->from, $rename->to, $classBuffer);
+        }
+
         $this->body = trim($classBuffer);
 
         $this->extractHierarchy();