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vendor/symfony/property-access/PropertyPath.php

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+<?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\PropertyAccess;
+
+use Symfony\Component\PropertyAccess\Exception\InvalidArgumentException;
+use Symfony\Component\PropertyAccess\Exception\InvalidPropertyPathException;
+use Symfony\Component\PropertyAccess\Exception\OutOfBoundsException;
+
+/**
+ * Default implementation of {@link PropertyPathInterface}.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @implements \IteratorAggregate<int, string>
+ */
+class PropertyPath implements \IteratorAggregate, PropertyPathInterface
+{
+    /**
+     * Character used for separating between plural and singular of an element.
+     */
+    public const SINGULAR_SEPARATOR = '|';
+
+    /**
+     * The elements of the property path.
+     *
+     * @var list<string>
+     */
+    private $elements = [];
+
+    /**
+     * The number of elements in the property path.
+     *
+     * @var int
+     */
+    private $length;
+
+    /**
+     * Contains a Boolean for each property in $elements denoting whether this
+     * element is an index. It is a property otherwise.
+     *
+     * @var array
+     */
+    private $isIndex = [];
+
+    /**
+     * String representation of the path.
+     *
+     * @var string
+     */
+    private $pathAsString;
+
+    /**
+     * Constructs a property path from a string.
+     *
+     * @param PropertyPath|string $propertyPath The property path as string or instance
+     *
+     * @throws InvalidArgumentException     If the given path is not a string
+     * @throws InvalidPropertyPathException If the syntax of the property path is not valid
+     */
+    public function __construct($propertyPath)
+    {
+        // Can be used as copy constructor
+        if ($propertyPath instanceof self) {
+            /* @var PropertyPath $propertyPath */
+            $this->elements = $propertyPath->elements;
+            $this->length = $propertyPath->length;
+            $this->isIndex = $propertyPath->isIndex;
+            $this->pathAsString = $propertyPath->pathAsString;
+
+            return;
+        }
+        if (!\is_string($propertyPath)) {
+            throw new InvalidArgumentException(sprintf('The property path constructor needs a string or an instance of "Symfony\Component\PropertyAccess\PropertyPath". Got: "%s".', get_debug_type($propertyPath)));
+        }
+
+        if ('' === $propertyPath) {
+            throw new InvalidPropertyPathException('The property path should not be empty.');
+        }
+
+        $this->pathAsString = $propertyPath;
+        $position = 0;
+        $remaining = $propertyPath;
+
+        // first element is evaluated differently - no leading dot for properties
+        $pattern = '/^(([^\.\[]++)|\[([^\]]++)\])(.*)/';
+
+        while (preg_match($pattern, $remaining, $matches)) {
+            if ('' !== $matches[2]) {
+                $element = $matches[2];
+                $this->isIndex[] = false;
+            } else {
+                $element = $matches[3];
+                $this->isIndex[] = true;
+            }
+
+            $this->elements[] = $element;
+
+            $position += \strlen($matches[1]);
+            $remaining = $matches[4];
+            $pattern = '/^(\.([^\.|\[]++)|\[([^\]]++)\])(.*)/';
+        }
+
+        if ('' !== $remaining) {
+            throw new InvalidPropertyPathException(sprintf('Could not parse property path "%s". Unexpected token "%s" at position %d.', $propertyPath, $remaining[0], $position));
+        }
+
+        $this->length = \count($this->elements);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __toString()
+    {
+        return $this->pathAsString;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getLength()
+    {
+        return $this->length;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParent()
+    {
+        if ($this->length <= 1) {
+            return null;
+        }
+
+        $parent = clone $this;
+
+        --$parent->length;
+        $parent->pathAsString = substr($parent->pathAsString, 0, max(strrpos($parent->pathAsString, '.'), strrpos($parent->pathAsString, '[')));
+        array_pop($parent->elements);
+        array_pop($parent->isIndex);
+
+        return $parent;
+    }
+
+    /**
+     * Returns a new iterator for this path.
+     *
+     * @return PropertyPathIteratorInterface
+     */
+    #[\ReturnTypeWillChange]
+    public function getIterator()
+    {
+        return new PropertyPathIterator($this);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getElements()
+    {
+        return $this->elements;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getElement(int $index)
+    {
+        if (!isset($this->elements[$index])) {
+            throw new OutOfBoundsException(sprintf('The index "%s" is not within the property path.', $index));
+        }
+
+        return $this->elements[$index];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isProperty(int $index)
+    {
+        if (!isset($this->isIndex[$index])) {
+            throw new OutOfBoundsException(sprintf('The index "%s" is not within the property path.', $index));
+        }
+
+        return !$this->isIndex[$index];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isIndex(int $index)
+    {
+        if (!isset($this->isIndex[$index])) {
+            throw new OutOfBoundsException(sprintf('The index "%s" is not within the property path.', $index));
+        }
+
+        return $this->isIndex[$index];
+    }
+}