FEATURE: Migrate instantiation through object manager

* Mark "create" as deprecated with a warning.
* Migrate first argument of "create" and "get" calls if they are
  deprecated.

Resolves: #4

Readme.rst

@@ -60,6 +60,15 @@ new ones like ``\TYPO3\Extbase\...``. This is done for:
 
 - Instantiation through ``makeInstance``.
 
+- Instantiation through ``ObjectManager``, check afterwards as this is static and all function calls
+  using ``get`` and ``create`` will be adjusted. Might be useful to exclude this sniff and run it
+  separately.
+
+Also we check for the following deprecated calls:
+
+- Check for ``create`` on ``ObjectManager``, which is "stupid" just all ``create`` calls are marked
+  with a warning.
+
 What does it look like?
 =======================
 

src/Standards/Typo3Update/Sniffs/LegacyClassnames/InstantiationWithObjectManagerSniff.php

@@ -0,0 +1,102 @@
+<?php
+
+/*
+ * Copyright (C) 2017  Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use PHP_CodeSniffer_Tokens as Tokens;
+
+/**
+ * Detect and migrate static calls to old legacy classnames.
+ */
+class Typo3Update_Sniffs_LegacyClassnames_InstantiationWithObjectManagerSniff implements PHP_CodeSniffer_Sniff
+{
+    use \Typo3Update\Sniffs\LegacyClassnames\ClassnameCheckerTrait;
+    use \Typo3Update\Sniffs\ExtendedPhpCsSupportTrait;
+
+    /**
+     * Returns the token types that this sniff is interested in.
+     *
+     * @return array<int>
+     */
+    public function register()
+    {
+        return Tokens::$functionNameTokens;
+    }
+
+    /**
+     * Processes the tokens that this sniff is interested in.
+     *
+     * @param PHP_CodeSniffer_File $phpcsFile The file where the token was found.
+     * @param int                  $stackPtr  The position in the stack where
+     *                                        the token was found.
+     *
+     * @return void
+     */
+    public function process(PHP_CodeSniffer_File $phpcsFile, $stackPtr)
+    {
+        if (!$this->isFunctionCall($phpcsFile, $stackPtr)) {
+            return;
+        }
+        $tokens = $phpcsFile->getTokens();
+
+        $functionName = $tokens[$stackPtr]['content'];
+        if (!in_array($functionName, ['get', 'create'])) {
+            return;
+        }
+
+        $classnamePosition = $phpcsFile->findNext(T_CONSTANT_ENCAPSED_STRING, $stackPtr);
+        if ($classnamePosition === false) {
+            return;
+        }
+
+        if ($functionName === 'create') {
+            $phpcsFile->addWarning(
+                'The "create" method of ObjectManager is no longer supported, please migrate to "get".',
+                $stackPtr,
+                'mightBeDeprecatedMethod',
+                ['create']
+            );
+        }
+
+        $classname = trim($tokens[$classnamePosition]['content'], '\'"');
+        $this->originalTokenContent = $tokens[$classnamePosition]['content'];
+        $this->addFixableError($phpcsFile, $classnamePosition, $classname);
+    }
+
+    /**
+     * As token contains more then just class name, we have to build new content ourself.
+     *
+     * @param string $classname
+     * @return string
+     */
+    protected function getTokenForReplacement($classname)
+    {
+        $stringSign = $this->originalTokenContent[0];
+        $token = explode($stringSign, $this->originalTokenContent);
+        $token[1] = $classname;
+
+        // Migrate double quote to single quote.
+        // This way no escaping of backslashes in class names is necessary.
+        if ($stringSign === '"') {
+            $stringSign = "'";
+        }
+
+        return implode($stringSign, $token);
+    }
+}