Add type declarations

composer.json

@@ -19,7 +19,8 @@
     "require-dev": {
         "kint-php/kint": "^3.3",
         "phpunit/phpunit": "*",
-        "friendsofphp/php-cs-fixer": "^3.39"
+        "friendsofphp/php-cs-fixer": "^3.39",
+        "phpstan/phpstan": "^1.10"
     },
     "autoload": {
         "psr-4": {

examples/CustomFlowElement.php

@@ -34,6 +34,9 @@
  *
  */
 
+// Uncomment the line below when running the example as a standalone script
+// require_once __DIR__ . '/../vendor/autoload.php';
+
 use fiftyone\pipeline\core\BasicListEvidenceKeyFilter;
 use fiftyone\pipeline\core\ElementDataDictionary;
 use fiftyone\pipeline\core\FlowElement;
@@ -84,9 +87,9 @@ class AstrologyFlowElement extends FlowElement
 {
     // datakey used to categorise data coming back from this
     // FlowElement in a Pipeline
-    public $dataKey = 'astrology';
+    public string $dataKey = 'astrology';
 
-    public $properties = [
+    public array $properties = [
         'starSign' => [
             'type' => 'string',
             'description' => "the user's starsign"
@@ -103,7 +106,7 @@ class AstrologyFlowElement extends FlowElement
 
     // The processInternal function is the core working of a FlowElement.
     // It takes FlowData, reads evidence and returns data.
-    public function processInternal($flowData)
+    public function processInternal($flowData): void
     {
         $result = [];
 
@@ -140,7 +143,7 @@ public function processInternal($flowData)
         $flowData->setElementData($data);
     }
 
-    public function getEvidenceKeyFilter()
+    public function getEvidenceKeyFilter(): BasicListEvidenceKeyFilter
     {
         // A filter (in this case a basic list) stating which evidence
         // the FlowElement is interested in

examples/FlowElementsForExamples.php

@@ -23,51 +23,52 @@
 
 use fiftyone\pipeline\core\BasicListEvidenceKeyFilter;
 use fiftyone\pipeline\core\ElementDataDictionary;
+use fiftyone\pipeline\core\FlowData;
 use fiftyone\pipeline\core\FlowElement;
 
 // Two simple FlowElements
 
 class ExampleFlowElementA extends FlowElement
 {
-    public $dataKey = 'example1';
+    public string $dataKey = 'example1';
 
-    public $properties = [
+    public array $properties = [
         'exampleProperty1' => [
             'type' => 'int'
         ]
     ];
 
-    public function processInternal($flowData)
+    public function processInternal(FlowData $flowData): void
     {
         $data = new ElementDataDictionary($this, ['exampleProperty1' => 5]);
 
         $flowData->setElementData($data);
     }
 
-    public function getEvidenceKeyFilter()
+    public function getEvidenceKeyFilter(): BasicListEvidenceKeyFilter
     {
         return new BasicListEvidenceKeyFilter(['header.user-agent']);
     }
 }
 
 class ExampleFlowElementB extends FlowElement
 {
-    public $dataKey = 'example2';
+    public string $dataKey = 'example2';
 
-    public $properties = [
+    public array $properties = [
         'exampleProperty2' => [
             'type' => 'int'
         ]
     ];
 
-    public function processInternal($flowData)
+    public function processInternal(FlowData $flowData): void
     {
         $data = new ElementDataDictionary($this, ['exampleProperty2' => 7]);
 
         $flowData->setElementData($data);
     }
 
-    public function getEvidenceKeyFilter()
+    public function getEvidenceKeyFilter(): BasicListEvidenceKeyFilter
     {
         return new BasicListEvidenceKeyFilter(['header.user-agent']);
     }
@@ -78,14 +79,14 @@ public function getEvidenceKeyFilter()
 
     class ErrorFlowElement extends FlowElement
     {
-        public $dataKey = 'error';
+        public string $dataKey = 'error';
 
-        public function processInternal($flowData)
+        public function processInternal(FlowData $flowData): void
         {
             throw new Exception('Something went wrong');
         }
 
-        public function getEvidenceKeyFilter()
+        public function getEvidenceKeyFilter(): BasicListEvidenceKeyFilter
         {
             return new BasicListEvidenceKeyFilter(['header.user-agent']);
         }
@@ -97,14 +98,14 @@ public function getEvidenceKeyFilter()
 
     class StopFlowElement extends FlowElement
     {
-        public $dataKey = 'stop';
+        public string $dataKey = 'stop';
 
-        public function processInternal($flowData)
+        public function processInternal(FlowData $flowData): void
         {
             $flowData->stop();
         }
 
-        public function getEvidenceKeyFilter()
+        public function getEvidenceKeyFilter(): BasicListEvidenceKeyFilter
         {
             return new BasicListEvidenceKeyFilter(['header.user-agent']);
         }

examples/Pipeline.php

@@ -49,7 +49,7 @@ class ArrayLogger extends Logger
 {
     public $log = [];
 
-    public function logInternal($log)
+    public function logInternal(array $log): void
     {
         if ($log['message'] === 'test') {
             $this->log[] = $log;

phpstan.neon.dist

@@ -0,0 +1,5 @@
+parameters:
+    phpVersion: 70400
+    level: 6
+    paths:
+        - src

src/AspectPropertyValue.php

@@ -21,17 +21,25 @@
  * such notice(s) shall fulfill the requirements of that article.
  * ********************************************************************* */
 
+declare(strict_types=1);
+
 namespace fiftyone\pipeline\core;
 
 /**
  * An AspectPropertyValue is a wrapper for a value
  * It lets you check this wrapper has a value inside it
  * If not value is set, a specific no value message is returned.
+ *
+ * @property mixed $value
  */
 class AspectPropertyValue
 {
-    public $noValueMessage;
-    public $hasValue = false;
+    public ?string $noValueMessage = null;
+    public bool $hasValue = false;
+
+    /**
+     * @var mixed
+     */
     private $_value;
 
     /**
@@ -40,15 +48,15 @@ class AspectPropertyValue
      * @param null|string $noValueMessage Reason why the value is missing
      * @param mixed $value
      */
-    public function __construct($noValueMessage = null, $value = 'noValue')
+    public function __construct(?string $noValueMessage = null, $value = 'noValue')
     {
         if ($value !== 'noValue') {
             $this->value = $value;
             $this->noValueMessage = null;
             $this->hasValue = true;
         }
 
-        if ($noValueMessage) {
+        if (!empty($noValueMessage)) {
             $this->hasValue = false;
             $this->noValueMessage = $noValueMessage;
         }
@@ -57,11 +65,10 @@ public function __construct($noValueMessage = null, $value = 'noValue')
     /**
      * Magic getter to access the value or throw an error with the no value message.
      *
-     * @param string $key
      * @return mixed
      * @throws \Exception
      */
-    public function __get($key)
+    public function __get(string $key)
     {
         if ($key === 'value') {
             if ($this->hasValue) {
@@ -71,9 +78,15 @@ public function __get($key)
                 throw new \Exception($this->noValueMessage);
             }
         }
+
+        return null;
     }
 
-    public function __set($key, $value)
+    /**
+     * @param mixed $value
+     * @return void
+     */
+    public function __set(string $key, $value)
     {
         if ($key === 'value') {
             $this->_value = $value;

src/BasicListEvidenceKeyFilter.php

@@ -21,6 +21,8 @@
  * such notice(s) shall fulfill the requirements of that article.
  * ********************************************************************* */
 
+declare(strict_types=1);
+
 namespace fiftyone\pipeline\core;
 
 /**
@@ -29,12 +31,15 @@
  */
 class BasicListEvidenceKeyFilter extends EvidenceKeyFilter
 {
-    private $list;
+    /**
+     * @var array<string>
+     */
+    private array $list;
 
     /**
-     * @param array $list an array of keys to keep
+     * @param array<string> $list An array of keys to keep
      */
-    public function __construct($list)
+    public function __construct(array $list)
     {
         $this->list = $list;
     }
@@ -43,7 +48,7 @@ public function __construct($list)
      * @param string $key key to check in the filter
      * @return bool is this key in the filter's keys list?
      */
-    public function filterEvidenceKey($key)
+    public function filterEvidenceKey(string $key): bool
     {
         $key = strtolower($key);
 
@@ -59,9 +64,9 @@ public function filterEvidenceKey($key)
     /**
      * Get the internal list of evidence keys in this filter.
      *
-     * @return array evidence keys
+     * @return array<string> evidence keys
      */
-    public function getList()
+    public function getList(): array
     {
         return $this->list;
     }

src/Constants.php

@@ -21,6 +21,8 @@
  * such notice(s) shall fulfill the requirements of that article.
  * ********************************************************************* */
 
+declare(strict_types=1);
+
 namespace fiftyone\pipeline\core;
 
 /**

src/ElementData.php

@@ -21,6 +21,8 @@
  * such notice(s) shall fulfill the requirements of that article.
  * ********************************************************************* */
 
+declare(strict_types=1);
+
 namespace fiftyone\pipeline\core;
 
 /**
@@ -29,19 +31,17 @@
  */
 class ElementData
 {
-    public $flowElement;
+    public FlowElement $flowElement;
 
-    /**
-     * Constructor for element data.
-     *
-     * @param FlowElement $flowElement
-     */
-    public function __construct($flowElement)
+    public function __construct(FlowElement $flowElement)
     {
         $this->flowElement = $flowElement;
     }
 
-    public function __get($key)
+    /**
+     * @return mixed
+     */
+    public function __get(string $key)
     {
         return $this->get($key);
     }
@@ -53,7 +53,7 @@ public function __get($key)
      * @param string $key Property name
      * @return mixed
      */
-    public function get($key)
+    public function get(string $key)
     {
         return $this->getInternal($key);
     }
@@ -62,42 +62,33 @@ public function get($key)
      * Get the values contained in the ElementData instance as a dictionary
      * of keys and values.
      *
-     * @return array
+     * @return array<string, mixed>
      */
-    public function asDictionary()
+    public function asDictionary(): array
     {
-        return;
+        return [];
     }
 
     /**
      * Helper method to get property as a string.
-     *
-     * @param string $key Property name
-     * @return string
      */
-    public function getAsString($key)
+    public function getAsString(string $key): string
     {
         return strval($this->get($key));
     }
 
     /**
      * Helper method to get property as a float.
-     *
-     * @param string $key
-     * @return float
      */
-    public function getAsFloat($key)
+    public function getAsFloat(string $key): float
     {
         return floatval($this->get($key));
     }
 
     /**
-     * Helper method to get property as a int.
-     *
-     * @param string $key Property name
-     * @return int
+     * Helper method to get property as an int.
      */
-    public function getAsInteger($key)
+    public function getAsInteger(string $key): int
     {
         return intval($this->get($key));
     }
@@ -109,7 +100,7 @@ public function getAsInteger($key)
      * @param string $key Property name
      * @return mixed
      */
-    protected function getInternal($key)
+    protected function getInternal(string $key)
     {
         return;
     }