FEATURE: Allow remapping of usages for redefiined classes

* As we already adjust function, trait and interface definitions, we now
  also migrate the usage of the old versions.
* This is done in second run, as mentioned in adjusted Readme.

Relates: #36

Readme.rst

@@ -71,6 +71,13 @@ new ones like ``\TYPO3\Extbase\...``. This is done for:
 
 - Convert old legacy class definitions in extensions to namespace ones.
 
+- Convert usage of previously converted class definitions. On first run the definition will be
+  converted, on second the usage. This is due to the fact, that PHPCS might find the definition
+  after the usage, so please run twice.
+
+  *NOTE* The configured file will be updated after each run, for each converted class, trait and
+  interface definition.
+
 - Add missing vendor to plugin and module registrations and configurations.
   You might want to set this to non fixable and warning if you already provide the vendor inside a
   single Variable, together with your extension key, as this is not recognized. So the following

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

@@ -22,6 +22,7 @@ namespace Typo3Update\Sniffs\LegacyClassnames;
 
 use PHP_CodeSniffer_File as PhpCsFile;
 use PHP_CodeSniffer_Sniff as PhpCsSniff;
+use Typo3Update\Sniffs\LegacyClassnames\Mapping;
 use Typo3Update\Sniffs\OptionsAccessTrait;
 
 /**
@@ -31,12 +32,6 @@ abstract class AbstractClassnameChecker implements PhpCsSniff
 {
     use OptionsAccessTrait;
 
-    /**
-     * Contains mapping from old -> new class names.
-     * @var array
-     */
-    private $legacyClassnames = [];
-
     /**
      * A list of extension names that might contain legacy class names.
      * Used to check clas names for warnings.
@@ -47,17 +42,9 @@ abstract class AbstractClassnameChecker implements PhpCsSniff
      */
     public $legacyExtensions = ['Extbase', 'Fluid'];
 
-    /**
-     * @param string $mappingFile File containing php array for mapping.
-     */
-    private function initialize($mappingFile = __DIR__ . '/../../../../../LegacyClassnames.php')
+    public function __construct()
     {
-        if ($this->legacyClassnames !== []) {
-            return;
-        }
-
-        $legacyClassnames = require $mappingFile;
-        $this->legacyClassnames = $legacyClassnames['aliasToClassNameMapping'];
+        $this->legacyMapping = Mapping::getInstance();
     }
 
     /**
@@ -111,8 +98,7 @@ abstract class AbstractClassnameChecker implements PhpCsSniff
      */
     protected function isLegacyClassname($classname)
     {
-        $this->initialize();
-        return isset($this->legacyClassnames[strtolower($classname)]);
+        return $this->legacyMapping->isLegacyClassname($classname);
     }
 
     /**
@@ -146,8 +132,21 @@ abstract class AbstractClassnameChecker implements PhpCsSniff
      */
     protected function getNewClassname($classname)
     {
-        $this->initialize();
-        return $this->legacyClassnames[strtolower($classname)];
+        return $this->legacyMapping->getNewClassname($classname);
+    }
+
+    /**
+     * Use to add new mappings found during parsing.
+     * E.g. in MissingNamespaceSniff old class definitions are fixed and a new mapping exists afterwards.
+     *
+     * @param string $legacyClassname
+     * @param string $newClassname
+     *
+     * @return void
+     */
+    protected function addLegacyClassname($legacyClassname, $newClassname)
+    {
+        $this->legacyMapping->addLegacyClassname($legacyClassname, $newClassname);
     }
 
     /**

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

@@ -0,0 +1,124 @@
+<?php
+namespace Typo3Update\Sniffs\LegacyClassnames;
+
+/*
+ * 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 Typo3Update\Sniffs\OptionsAccessTrait;
+
+/**
+ * Singleton wrapper for mappings.
+ *
+ * Will check the configured file for whether a class is legacy and provides further methods.
+ * Also can update to add new migrated class names.
+ */
+class Mapping
+{
+    use OptionsAccessTrait;
+
+    // Singleton implementation - Start
+    static protected $instance = null;
+    public static function getInstance()
+    {
+        if (static::$instance === null) {
+            static::$instance = new Mapping();
+        }
+
+        return static::$instance;
+    }
+    private function __clone()
+    {
+    }
+    private function __wakeup()
+    {
+    }
+    private function __construct()
+    {
+        // $mappingFile = $this->getMappingFile();
+        $mappingFile = __DIR__ . '/../../../../../LegacyClassnames.php';
+
+        $this->mappings = require $mappingFile;
+    }
+    // Singleton implementation - End
+
+    /**
+     * Contains mappings as defined by composer for alias mapping.
+     * @var array
+     */
+    protected $mappings = [];
+
+    /**
+     * Checks whether a mapping exists for the given $classname,
+     * indicating it's legacy.
+     *
+     * @param string $classname
+     * @return bool
+     */
+    public function isLegacyClassname($classname)
+    {
+        return isset($this->mappings['aliasToClassNameMapping'][strtolower($classname)]);
+    }
+
+    /**
+     * @param string $classname
+     * @return string
+     */
+    public function getNewClassname($classname)
+    {
+        return $this->mappings['aliasToClassNameMapping'][strtolower($classname)];
+    }
+
+    /**
+     * Use to add new mappings found during parsing.
+     * E.g. in MissingNamespaceSniff old class definitions are fixed and a new mapping exists afterwards.
+     *
+     * @param string $legacyClassname
+     * @param string $newClassname
+     *
+     * @return void
+     */
+    public function addLegacyClassname($legacyClassname, $newClassname)
+    {
+        $key = strtolower($legacyClassname);
+
+        $this->mappings['aliasToClassNameMapping'][$key] = $newClassname;
+        $this->mappings['classNameToAliasMapping'][$newClassname] = [$key => $key];
+    }
+
+    /**
+     * Used to persist new mappings.
+     */
+    public function __destruct()
+    {
+        // For some reasons desctruct is called multiple times, while construct
+        // is called once. Until we know the issue and fix it, this is our
+        // workaround to not break the file and do stuff in an unkown instance.
+        if ($this !== static::$instance) {
+            return;
+        }
+
+        // $mappingFile = $this->getMappingFile();
+        $mappingFile = __DIR__ . '/../../../../../LegacyClassnames.php';
+
+        file_put_contents(
+            $mappingFile,
+            '<?php' . PHP_EOL . 'return ' . var_export($this->mappings, true) . ';'
+        );
+    }
+}

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

@@ -109,6 +109,10 @@ class Typo3Update_Sniffs_LegacyClassnames_MissingNamespaceSniff extends Abstract
             $this->getNamespacePosition($phpcsFile),
             '<?php' . $lineEndings . $this->getNamespaceDefinition($classname) . $suffix
         );
+        $this->addLegacyClassname(
+            $classname,
+            $this->getNamespace($classname) . '\\' . $this->getNewClassname($classname)
+        );
     }
 
     /**
@@ -130,14 +134,7 @@ class Typo3Update_Sniffs_LegacyClassnames_MissingNamespaceSniff extends Abstract
      */
     protected function getNamespaceDefinition($classname)
     {
-        $vendor = trim($this->getVendor(), '\\/');
-
-        return 'namespace '
-            . $vendor
-            . '\\'
-            . $this->getNamespace($classname)
-            . ';'
-            ;
+        return 'namespace ' . $this->getNamespace($classname) . ';';
     }
 
     /**
@@ -150,11 +147,12 @@ class Typo3Update_Sniffs_LegacyClassnames_MissingNamespaceSniff extends Abstract
      */
     protected function getNamespace($classname)
     {
+        $vendor = trim($this->getVendor(), '\\/');
         $classnameParts = explode('_', $classname);
 
         unset($classnameParts[0]); // Remove Tx_
         unset($classnameParts[count($classnameParts)]); // Remove class name itself.
 
-        return implode('\\', $classnameParts);
+        return $vendor . '\\' . implode('\\', $classnameParts);
     }
 }