1 files changed, 179 insertions, 0 deletions
diff --git a/vendor/ipl/stdlib/src/Filter/Chain.php b/vendor/ipl/stdlib/src/Filter/Chain.php
new file mode 100644
index 0000000..9422d3a
--- /dev/null
+++ b/vendor/ipl/stdlib/src/Filter/Chain.php
@@ -0,0 +1,179 @@
+<?php
+
+namespace ipl\Stdlib\Filter;
+
+use ArrayIterator;
+use Countable;
+use IteratorAggregate;
+use OutOfBoundsException;
+use Traversable;
+
+abstract class Chain implements Rule, MetaDataProvider, IteratorAggregate, Countable
+{
+    use MetaData;
+
+    /** @var array<int, Rule> */
+    protected $rules = [];
+
+    /**
+     * Create a new Chain
+     *
+     * @param Rule ...$rules
+     */
+    public function __construct(Rule ...$rules)
+    {
+        foreach ($rules as $rule) {
+            $this->add($rule);
+        }
+    }
+
+    /**
+     * Clone this chain's meta data and rules
+     */
+    public function __clone()
+    {
+        if ($this->metaData !== null) {
+            $this->metaData = clone $this->metaData;
+        }
+
+        foreach ($this->rules as $i => $rule) {
+            $this->rules[$i] = clone $rule;
+        }
+    }
+
+    /**
+     * Get an iterator this chain's rules
+     *
+     * @return ArrayIterator<int, Rule>
+     */
+    public function getIterator(): Traversable
+    {
+        return new ArrayIterator($this->rules);
+    }
+
+    /**
+     * Add a rule to this chain
+     *
+     * @param Rule $rule
+     *
+     * @return $this
+     */
+    public function add(Rule $rule)
+    {
+        $this->rules[] = $rule;
+
+        return $this;
+    }
+
+    /**
+     * Prepend a rule to an existing rule in this chain
+     *
+     * @param Rule $rule
+     * @param Rule $before
+     *
+     * @throws OutOfBoundsException In case no existing rule is found
+     * @return $this
+     */
+    public function insertBefore(Rule $rule, Rule $before)
+    {
+        $ruleAt = array_search($before, $this->rules, true);
+        if ($ruleAt === false) {
+            throw new OutOfBoundsException('Reference rule not found');
+        }
+
+        array_splice($this->rules, $ruleAt, 0, [$rule]);
+
+        return $this;
+    }
+
+    /**
+     * Append a rule to an existing rule in this chain
+     *
+     * @param Rule $rule
+     * @param Rule $after
+     *
+     * @throws OutOfBoundsException In case no existing rule is found
+     * @return $this
+     */
+    public function insertAfter(Rule $rule, Rule $after)
+    {
+        $ruleAt = array_search($after, $this->rules, true);
+        if ($ruleAt === false) {
+            throw new OutOfBoundsException('Reference rule not found');
+        }
+
+        array_splice($this->rules, $ruleAt + 1, 0, [$rule]);
+
+        return $this;
+    }
+
+    /**
+     * Get whether this chain contains the given rule
+     *
+     * @param Rule $rule
+     *
+     * @return bool
+     */
+    public function has(Rule $rule)
+    {
+        return array_search($rule, $this->rules, true) !== false;
+    }
+
+    /**
+     * Replace a rule with another one in this chain
+     *
+     * @param Rule $rule
+     * @param Rule $replacement
+     *
+     * @throws OutOfBoundsException In case no existing rule is found
+     * @return $this
+     */
+    public function replace(Rule $rule, Rule $replacement)
+    {
+        $ruleAt = array_search($rule, $this->rules, true);
+        if ($ruleAt === false) {
+            throw new OutOfBoundsException('Rule to replace not found');
+        }
+
+        array_splice($this->rules, $ruleAt, 1, [$replacement]);
+
+        return $this;
+    }
+
+    /**
+     * Remove a rule from this chain
+     *
+     * @param Rule $rule
+     *
+     * @return $this
+     */
+    public function remove(Rule $rule)
+    {
+        $ruleAt = array_search($rule, $this->rules, true);
+        if ($ruleAt !== false) {
+            array_splice($this->rules, $ruleAt, 1, []);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get whether this chain has any rules
+     *
+     * @return bool
+     */
+    public function isEmpty()
+    {
+        return empty($this->rules);
+    }
+
+    /**
+     * Count this chain's rules
+     *
+     * @return int
+     */
+    public function count(): int
+    {
+        return count($this->rules);
+    }
+}