Fix case sensitivity for special class names

lib/PhpParser/NodeVisitor/NameResolver.php

@@ -122,7 +122,7 @@ class NameResolver extends NodeVisitorAbstract
 
     protected function resolveClassName(Name $name) {
         // don't resolve special class names
-        if (in_array((string) $name, array('self', 'parent', 'static'))) {
+        if (in_array(strtolower($name), array('self', 'parent', 'static'))) {
             return $name;
         }
 

test/PhpParser/NodeVisitor/NameResolverTest.php

@@ -314,4 +314,35 @@ EOC;
 
         $this->assertEquals(array('Bar', 'Baz'), $stmt->stmts[1]->expr->class->parts);
     }
+
+    public function testSpecialClassNamesAreCaseInsensitive() {
+        $source = <<<'EOC'
+<?php
+namespace Foo;
+
+class Bar
+{
+    public static function method()
+    {
+        SELF::method();
+        PARENT::method();
+        STATIC::method();
+    }
+}
+EOC;
+
+        $parser = new PhpParser\Parser(new PhpParser\Lexer\Emulative);
+        $stmts = $parser->parse($source);
+
+        $traverser = new PhpParser\NodeTraverser;
+        $traverser->addVisitor(new NameResolver);
+
+        $stmts = $traverser->traverse($stmts);
+        $classStmt = $stmts[0];
+        $methodStmt = $classStmt->stmts[0]->stmts[0];
+
+        $this->assertEquals('SELF', (string)$methodStmt->stmts[0]->class);
+        $this->assertEquals('PARENT', (string)$methodStmt->stmts[1]->class);
+        $this->assertEquals('static', (string)$methodStmt->stmts[2]->class);
+    }
 }