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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\Config\Definition\Builder;

use Symfony\Component\Config\Definition\Exception\TreeWithoutRootNodeException;
use Symfony\Component\Config\Definition\NodeInterface;

/**
 * This is the entry class for building a config tree.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class TreeBuilder implements NodeParentInterface
{
    protected $tree;
    protected $root;

public function __construct(string $name = null, string $type = 'array', NodeBuilder $builder = null)
    {
        if (null === $name) {
            @trigger_error('A tree builder without a root node is deprecated since Symfony 4.2 and will not be supported anymore in 5.0.', \E_USER_DEPRECATED);
        } else {
            $builder = $builder ?? new NodeBuilder();
            $this->root = $builder->node($name, $type)->setParent($this);
        }
    }

/**
     * Creates the root node.
     *
     * @param string $name The name of the root node
     * @param string $type The type of the root node
     *
     * @return ArrayNodeDefinition|NodeDefinition The root node (as an ArrayNodeDefinition when the type is 'array')
     *
     * @throws \RuntimeException When the node type is not supported
     *
     * @deprecated since Symfony 4.3, pass the root name to the constructor instead
     */
    public function root($name, $type = 'array', NodeBuilder $builder = null)
    {
        @trigger_error(sprintf('The "%s()" method called for the "%s" configuration is deprecated since Symfony 4.3, pass the root name to the constructor instead.', __METHOD__, $name), \E_USER_DEPRECATED);

$builder = $builder ?? new NodeBuilder();

return $this->root = $builder->node($name, $type)->setParent($this);
    }

/**
     * @return NodeDefinition|ArrayNodeDefinition The root node (as an ArrayNodeDefinition when the type is 'array')
     */
    public function getRootNode(): NodeDefinition
    {
        if (null === $this->root) {
            throw new \RuntimeException(sprintf('Calling "%s()" before creating the root node is not supported, migrate to the new constructor signature instead.', __METHOD__));
        }

return $this->root;
    }

/**
     * Builds the tree.
     *
     * @return NodeInterface
     *
     * @throws \RuntimeException
     */
    public function buildTree()
    {
        $this->assertTreeHasRootNode();
        if (null !== $this->tree) {
            return $this->tree;
        }

return $this->tree = $this->root->getNode(true);
    }

public function setPathSeparator(string $separator)
    {
        $this->assertTreeHasRootNode();

// unset last built as changing path separator changes all nodes
        $this->tree = null;

$this->root->setPathSeparator($separator);
    }

/**
     * @throws \RuntimeException if root node is not defined
     */
    private function assertTreeHasRootNode()
    {
        if (null === $this->root) {
            throw new TreeWithoutRootNodeException('The configuration tree has no root node.');
        }
    }
}