Support nested generics and closures type hint

src/Barryvdh/Reflection/DocBlock/Tag/ParamTag.php

@@ -46,20 +46,37 @@ class ParamTag extends ReturnTag
     public function setContent($content)
     {
         Tag::setContent($content);
-        $parts = preg_split(
-            '/(\s+)/Su',
-            $this->description,
-            3,
-            PREG_SPLIT_DELIM_CAPTURE
-        );
 
-        // detect generic type
+        $parts = [];
-        if (isset($parts[0]) && isset($parts[2]) && strpos($parts[0], '<') !== false && strpos($parts[2], '>') !== false) {
+        $rest = $this->description;
-            $parts[0] .= ' ' . $parts[2];
+
-            unset($parts[1]);
+        // parsing generics and closures to detect types
-            unset($parts[2]);
+        for($pos = 0, $stacks = []; $pos < strlen($rest); $pos++) {
-            $parts = array_values($parts);
+            $char = $rest[$pos];
+
+            if($char === '<') {
+                array_unshift($stacks, $char);
             }
+            if($char === '(') {
+                array_unshift($stacks, $char);
+            }
+            if($char === '>' && isset($stacks[0]) && $stacks[0] === '<') {
+                array_shift($stacks);
+            }
+            if($char === ')' && isset($stacks[0]) && $stacks[0] === '(') {
+                array_shift($stacks);
+            }
+
+            if(!$stacks && preg_match('/\A(\s+)(.*)/su', substr($rest, $pos), $matches)) {
+                $parts[0] = substr($rest, 0, $pos);
+                $parts[1] = $matches[1];
+                $rest = $matches[2];
+
+                break;
+            }
+        }
+
+        array_push($parts, ...preg_split('/(\s+)/u', $rest, 2, PREG_SPLIT_DELIM_CAPTURE));
 
         // if the first item that is encountered is not a variable; it is a type
         if (isset($parts[0])

src/Barryvdh/Reflection/DocBlock/Type/Collection.php

@@ -145,9 +145,9 @@ class Collection extends \ArrayObject
                 $type_parts[] = $curr_type;
                 $curr_type = '';
             } else {
-                if ($char === '<') {
+                if ($char === '<' || $char === '(') {
                     $nest_level++;
-                } else if ($char === '>') {
+                } else if ($char === '>' || $char === ')') {
                     $nest_level--;
                 }
 
@@ -189,6 +189,10 @@ class Collection extends \ArrayObject
             return $type;
         }
 
+        if($type[0] === '(') {
+            return $type;
+        }
+
         if ($this->isTypeAnArray($type)) {
             return $this->expand(substr($type, 0, -2)) . self::OPERATOR_ARRAY;
         }

tests/Barryvdh/Reflection/DocBlock/Tag/ParamTagTest.php

@@ -114,7 +114,75 @@ class ParamTagTest extends TestCase
                 array('int'),
                 '$bob',
                 "Type on a new line"
-            )
+            ),
+
+            // generic array
+            array(
+                'param',
+                'array<int, string> $names',
+                'array<int, string>',
+                array('array<int, string>'),
+                '$names',
+                ''
+            ),
+
+            // nested generics
+            array(
+                'param',
+                'array<int, array<string, mixed>> $arrays',
+                'array<int, array<string, mixed>>',
+                array('array<int, array<string, mixed>>'),
+                '$arrays',
+                ''
+            ),
+
+            // closure
+            array(
+                'param',
+                '(\Closure(int, string): bool) $callback',
+                '(\Closure(int, string): bool)',
+                array('(\Closure(int, string): bool)'),
+                '$callback',
+                ''
+            ),
+
+            // generic array in closure
+            array(
+                'param',
+                '(\Closure(array<int, string>): bool) $callback',
+                '(\Closure(array<int, string>): bool)',
+                array('(\Closure(array<int, string>): bool)'),
+                '$callback',
+                ''
+            ),
+
+            // union types in closure
+            array(
+                'param',
+                '(\Closure(int|string): bool)|bool $callback',
+                '(\Closure(int|string): bool)|bool',
+                array('(\Closure(int|string): bool)', 'bool'),
+                '$callback',
+                ''
+            ),
+
+            // example from Laravel Framework - Eloquent Builder)
+            array(
+                'param',
+                'array<array-key, array|(\Closure(\Illuminate\Database\Eloquent\Relations\Relation<*,*,*>): mixed)|string>|string  $relations',
+                'array<array-key, array|(\Closure(\Illuminate\Database\Eloquent\Relations\Relation<*,*,*>): mixed)|string>|string',
+                array('array<array-key, array|(\Closure(\Illuminate\Database\Eloquent\Relations\Relation<*,*,*>): mixed)|string>', 'string'),
+                '$relations',
+                ''
+            ),
+            array(
+                'param',
+                '(\Closure(\Illuminate\Database\Eloquent\Relations\Relation<*,*,*>): mixed)|string|null  $callback',
+                '(\Closure(\Illuminate\Database\Eloquent\Relations\Relation<*,*,*>): mixed)|string|null',
+                array('(\Closure(\Illuminate\Database\Eloquent\Relations\Relation<*,*,*>): mixed)', 'string', 'null'),
+                '$callback',
+                ''
+            ),
         );
     }
 }