Moved exceptions to "Core/Exception" folder

Author: WalterWoshid

src/Exception/CodeTransformerException.php renamed to src/Core/Exception/CodeTransformerException.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception;
+namespace Okapi\CodeTransformer\Core\Exception;
 
 use RuntimeException;
 

src/Exception/Kernel/DirectKernelInitializationException.php renamed to src/Core/Exception/Kernel/DirectKernelInitializationException.php

@@ -1,8 +1,8 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception\Kernel;
+namespace Okapi\CodeTransformer\Core\Exception\Kernel;
 
-use Okapi\CodeTransformer\Exception\KernelException;
+use Okapi\CodeTransformer\Core\Exception\KernelException;
 
 /**
  * # Initialize Kernel Exception
@@ -18,8 +18,8 @@ class DirectKernelInitializationException extends KernelException
     public function __construct()
     {
         parent::__construct(
-            "Cannot initialize CodeTransformerKernel directly. " .
-            "Please extend from CodeTransformerKernel and call the init() method.",
+            'Cannot initialize CodeTransformerKernel directly. ' .
+            'Please extend from CodeTransformerKernel and call the init() method.',
         );
     }
 }

src/Exception/KernelException.php renamed to src/Core/Exception/KernelException.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception;
+namespace Okapi\CodeTransformer\Core\Exception;
 
 /**
  * # Kernel Exception

src/Exception/StreamFilter/InvalidStreamException.php renamed to src/Core/Exception/StreamFilter/InvalidStreamException.php

@@ -1,8 +1,8 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception\StreamFilter;
+namespace Okapi\CodeTransformer\Core\Exception\StreamFilter;
 
-use Okapi\CodeTransformer\Exception\StreamFilterException;
+use Okapi\CodeTransformer\Core\Exception\StreamFilterException;
 
 /**
  * # Invalid Stream Exception
@@ -19,7 +19,7 @@ class InvalidStreamException extends StreamFilterException
     public function __construct()
     {
         parent::__construct(
-            "The stream must be a valid resource.",
+            'The stream must be a valid resource.',
         );
     }
 }

src/Exception/StreamFilterException.php renamed to src/Core/Exception/StreamFilterException.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception;
+namespace Okapi\CodeTransformer\Core\Exception;
 
 /**
  * # Stream Filter Exception

src/Core/Exception/Transformer/InvalidTransformerClassException.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Okapi\CodeTransformer\Core\Exception\Transformer;
+
+use Okapi\CodeTransformer\Core\Exception\TransformerException;
+use Okapi\CodeTransformer\Transformer;
+
+/**
+ * # Invalid Transformer Class Exception
+ *
+ * This exception is thrown when a transformer class does not extend the
+ * {@see Transformer} class.
+ */
+class InvalidTransformerClassException extends TransformerException
+{
+    /**
+     * InvalidTransformerClassException constructor.
+     *
+     * @param class-string $transformerClass
+     */
+    public function __construct(string $transformerClass)
+    {
+        parent::__construct(
+            'Transformer class "' . $transformerClass . '" does not extend the Transformer class.',
+        );
+    }
+}

src/Exception/Transformer/SyntaxError.php renamed to src/Core/Exception/Transformer/SyntaxError.php

@@ -1,9 +1,9 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception\Transformer;
+namespace Okapi\CodeTransformer\Core\Exception\Transformer;
 
 use Microsoft\PhpParser\Diagnostic;
-use Okapi\CodeTransformer\Exception\TransformerException;
+use Okapi\CodeTransformer\Core\Exception\TransformerException;
 
 /**
  * # Syntax Error
@@ -20,12 +20,12 @@ class SyntaxError extends TransformerException
      * @param SyntaxError|null $previous
      */
     public function __construct(
-        Diagnostic $diagnostic,
-        string $code,
-        ?SyntaxError $previous = null
+        Diagnostic   $diagnostic,
+        string       $code,
+        ?SyntaxError $previous = null,
     ) {
         parent::__construct(
-            "Syntax error in transformed code: $diagnostic->message\n\nFull code:\n```php\n$code\n```",
+            message:  "Syntax error in transformed code: $diagnostic->message\n\nFull code:\n```php\n$code\n```",
             previous: $previous,
         );
     }

src/Exception/Transformer/TransformerNotFoundException.php renamed to src/Core/Exception/Transformer/TransformerNotFoundException.php

@@ -1,8 +1,8 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception\Transformer;
+namespace Okapi\CodeTransformer\Core\Exception\Transformer;
 
-use Okapi\CodeTransformer\Exception\TransformerException;
+use Okapi\CodeTransformer\Core\Exception\TransformerException;
 
 /**
  * # Transformer Not Found Exception
@@ -19,7 +19,7 @@ class TransformerNotFoundException extends TransformerException
     public function __construct(string $transformerClass)
     {
         parent::__construct(
-            "Transformer class '$transformerClass' does not exist.",
+            'Transformer class "' . $transformerClass . '" does not exist.',
         );
     }
 }

src/Exception/TransformerException.php renamed to src/Core/Exception/TransformerException.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Okapi\CodeTransformer\Exception;
+namespace Okapi\CodeTransformer\Core\Exception;
 
 /**
  * # Transformer Exception