converter: apply whitelist filtering on supported types

src/Converter.php

@@ -37,6 +37,19 @@ class Converter
     const OBJECT_TRAIT = 2;
     const OBJECT_FUNCTION = 3;
 
+    /**
+     * @link http://php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration
+     */
+    const TYPES = [
+        'array',
+        'bool',
+        'callable',
+        'float',
+        'int',
+        'self',
+        'string',
+    ];
+
     /**
      * Converts the given file.
      *
@@ -446,13 +459,44 @@ private function getReturn(Project $project, int $objectType, string $namespace
     }
 
     /**
-     * Gets the type of the parameter or null if it is not defined.
+     * Gets the parameter type and tries to find best-matching PHP type
+     *
+     * Commonly used type aliases are normalized and a whitelist for
+     * all-lowercase types is applied.
      *
      * @param Tag $tag
      *
      * @return array
      */
     private function getType(Tag $tag): array
+    {
+        $type = $this->getTypeFromTag($tag);
+
+        if (!$type) {
+            return $type;
+        }
+
+        $typeDesc = $type[0];
+
+        if ($typeDesc === strtolower($typeDesc)) {
+            $typeDesc = $this->normalizeType($typeDesc);
+            // match all-lowercase types against known types
+            if (!in_array($typeDesc, static::TYPES)) {
+                return [];
+            }
+        }
+
+        return $type;
+    }
+
+    /**
+     * Gets the type of the parameter or an empty array if it is not defined.
+     *
+     * @param Tag $tag
+     *
+     * @return array
+     */
+    private function getTypeFromTag(Tag $tag): array
     {
         $type = $tag->getType();
 
@@ -517,4 +561,35 @@ private function endsInNewLine(string $output): string
 
         return $matches[1];
     }
+
+     /**
+     * Normalizes the type.
+     *
+     * @link https://github.com/symfony/symfony/blob/d2d8d17a8068d76f42c42c7791f45ca68f4f98a4/src/Symfony/Component/PropertyInfo/Extractor/PhpDocExtractor.php#L317-L346
+     * @license https://github.com/symfony/symfony/blob/d2d8d17a8068d76f42c42c7791f45ca68f4f98a4/src/Symfony/Component/PropertyInfo/LICENSE
+     *
+     * @param string $docType
+     *
+     * @return string
+     */
+    private function normalizeType($docType)
+    {
+        switch ($docType) {
+            case 'integer':
+                return 'int';
+
+            case 'boolean':
+                return 'bool';
+
+            // real is not part of the PHPDoc standard, so we ignore it
+            case 'double':
+                return 'float';
+
+            case 'callback':
+                return 'callable';
+
+            default:
+                return $docType;
+        }
+    }
 }

tests/Fixtures/type_aliases_and_whitelisting.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * @param integer $integer
+ * @param boolean $boolean
+ * @param real $real
+ * @param double $double
+ * @param callback $callback
+ * @param void $void
+ * @param mixed $mixed
+ * @param unknown $unknown
+ * @param Class $class
+ */
+function aliases($integer, $boolean, $real, $double, $callback, $void, $mixed, $unkown, $class) {
+}

tests/test.php

@@ -238,7 +238,7 @@ function param_no_type($noType)
 }
 
 $projectFactory = ProjectFactory::createInstance();
-$project = $projectFactory->create('paramNoType', [__DIR__.'/Fixtures/array_no_types.php']);
+$project = $projectFactory->create('arrayNoTypes', [__DIR__.'/Fixtures/array_no_types.php']);
 
 foreach ($project->getFiles() as $path => $file) {
     $expected = <<<'PHP'
@@ -257,4 +257,29 @@ function array_no_types(array $ints, array $strings, array $someClasses) : array
     same($expected, $converter->convert($project, $file));
 }
 
+
+$projectFactory = ProjectFactory::createInstance();
+$project = $projectFactory->create('typeAliasesWhitelisting', [__DIR__.'/Fixtures/type_aliases_and_whitelisting.php']);
+
+foreach ($project->getFiles() as $path => $file) {
+    $expected = <<<'PHP'
+<?php
+/**
+ * @param integer $integer
+ * @param boolean $boolean
+ * @param real $real
+ * @param double $double
+ * @param callback $callback
+ * @param void $void
+ * @param mixed $mixed
+ * @param unknown $unknown
+ * @param Class $class
+ */
+function aliases(int $integer, bool $boolean, $real, float $double, callable $callback, $void, $mixed, $unkown, \Class $class) {
+}
+
+PHP;
+    same($expected, $converter->convert($project, $file));
+}
+
 echo 'Good job! Everything is fine.'.PHP_EOL;