bug #30349 [VarDumper] fix dumping Ds maps and pairs (nicolas-grekas)

This PR was merged into the 4.3-dev branch.

Discussion
----------

[VarDumper] fix dumping Ds maps and pairs

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Fixes #30311 (comment)

![image](https://user-images.githubusercontent.com/243674/53267273-41260e80-36e3-11e9-8723-a73bf0690a01.png)

Commits
-------

45869ac [VarDumper] fix dumping Ds maps and pairs

src/Symfony/Component/VarDumper/Caster/DsCaster.php

@@ -11,13 +11,9 @@
 
 namespace Symfony\Component\VarDumper\Caster;
 
-use Ds\Deque;
+use Ds\Collection;
 use Ds\Map;
-use Ds\PriorityQueue;
-use Ds\Queue;
-use Ds\Set;
-use Ds\Stack;
-use Ds\Vector;
+use Ds\Pair;
 use Symfony\Component\VarDumper\Cloner\Stub;
 
 /**
@@ -27,23 +23,45 @@
  */
 class DsCaster
 {
-    /**
-     * @param Set|Deque|Vector|Stack|Queue|PriorityQueue $c
-     */
-    public static function castDs($c, array $a, Stub $stub, bool $isNested): array
+    public static function castCollection(Collection $c, array $a, Stub $stub, bool $isNested): array
     {
-        $prefix = Caster::PREFIX_VIRTUAL;
-        $a = $c->toArray();
-        $a[$prefix.'capacity'] = $c->capacity();
+        $a[Caster::PREFIX_VIRTUAL.'count'] = $c->count();
+        $a[Caster::PREFIX_VIRTUAL.'capacity'] = $c->capacity();
+
+        if (!$c instanceof Map) {
+            $a += $c->toArray();
+        }
 
         return $a;
     }
 
     public static function castMap(Map $c, array $a, Stub $stub, bool $isNested): array
     {
-        $prefix = Caster::PREFIX_VIRTUAL;
-        $a = $c->pairs()->toArray();
-        $a[$prefix.'capacity'] = $c->capacity();
+        foreach ($c as $k => $v) {
+            $a[] = new DsPairStub($k, $v);
+        }
+
+        return $a;
+    }
+
+    public static function castPair(Pair $c, array $a, Stub $stub, bool $isNested): array
+    {
+        foreach ($c->toArray() as $k => $v) {
+            $a[Caster::PREFIX_VIRTUAL.$k] = $v;
+        }
+
+        return $a;
+    }
+
+    public static function castPairStub(DsPairStub $c, array $a, Stub $stub, bool $isNested): array
+    {
+        if ($isNested) {
+            $stub->class = Pair::class;
+            $stub->value = null;
+            $stub->handle = 0;
+
+            $a = $c->value;
+        }
 
         return $a;
     }

src/Symfony/Component/VarDumper/Caster/DsPairStub.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\VarDumper\Caster;
+
+use Symfony\Component\VarDumper\Cloner\Stub;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class DsPairStub extends Stub
+{
+    public function __construct($key, $value)
+    {
+        $this->value = [
+            Caster::PREFIX_VIRTUAL.'key' => $key,
+            Caster::PREFIX_VIRTUAL.'value' => $value,
+        ];
+    }
+}

src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php

@@ -125,13 +125,10 @@ abstract class AbstractCloner implements ClonerInterface
 
         'Memcached' => ['Symfony\Component\VarDumper\Caster\MemcachedCaster', 'castMemcached'],
 
-        'Ds\Set' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castDs'],
-        'Ds\Vector' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castDs'],
-        'Ds\Deque' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castDs'],
-        'Ds\Stack' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castDs'],
-        'Ds\Queue' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castDs'],
-        'Ds\PriorityQueue' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castDs'],
+        'Ds\Collection' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castCollection'],
         'Ds\Map' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castMap'],
+        'Ds\Pair' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castPair'],
+        'Symfony\Component\VarDumper\Caster\DsPairStub' => ['Symfony\Component\VarDumper\Caster\DsCaster', 'castPairStub'],
 
         ':curl' => ['Symfony\Component\VarDumper\Caster\ResourceCaster', 'castCurl'],
         ':dba' => ['Symfony\Component\VarDumper\Caster\ResourceCaster', 'castDba'],