Implement pointers collection

src/Pointers/Pointers.php

@@ -2,13 +2,14 @@
 
 namespace Cerbero\JsonParser\Pointers;
 
-use Stringable;
+use Cerbero\JsonParser\Tree;
+use Countable;
 
 /**
  * The JSON pointers collection.
  *
  */
-class Pointers
+class Pointers implements Countable
 {
     /**
      * The JSON pointers collection.
@@ -17,6 +18,20 @@ class Pointers
      */
     protected array $pointers;
 
+    /**
+     * The default pointer.
+     *
+     * @var Pointer
+     */
+    protected Pointer $defaultPointer;
+
+    /**
+     * The list of pointers that were found within the JSON.
+     *
+     * @var array
+     */
+    protected array $found = [];
+
     /**
      * Instantiate the class.
      *
@@ -25,5 +40,49 @@ class Pointers
     public function __construct(Pointer ...$pointers)
     {
         $this->pointers = $pointers;
+        $this->defaultPointer = new NullPointer();
+    }
+
+    /**
+     * Retrieve the number of JSON pointers
+     *
+     * @return int
+     */
+    public function count(): int
+    {
+        return count($this->pointers);
+    }
+
+    /**
+     * Retrieve the pointer matching the given tree
+     *
+     * @param Tree $tree
+     * @return Pointer
+     */
+    public function matchTree(Tree $tree): Pointer
+    {
+        $pointers = [];
+
+        foreach ($this->pointers as $pointer) {
+            foreach ($tree as $depth => $node) {
+                if (!$pointer->depthMatchesNode($depth, $node)) {
+                    continue 2;
+                } elseif (!isset($pointers[$depth])) {
+                    $pointers[$depth] = $pointer;
+                }
+            }
+        }
+
+        return end($pointers) ?: $this->defaultPointer;
+    }
+
+    /**
+     * Determine whether all pointers were found within the JSON
+     *
+     * @return bool
+     */
+    public function wereFound(): bool
+    {
+        return count($this->pointers) == count($this->found);
     }
 }