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EDIT :: XmlReferenceDumper.php

<?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\Dumper;

use Symfony\Component\Config\Definition\ConfigurationInterface;
use Symfony\Component\Config\Definition\NodeInterface;
use Symfony\Component\Config\Definition\ArrayNode;
use Symfony\Component\Config\Definition\EnumNode;
use Symfony\Component\Config\Definition\PrototypedArrayNode;

/**
 * Dumps a XML reference configuration for the given configuration/node instance.
 *
 * @author Wouter J <waldio.webdesign@gmail.com>
 */
class XmlReferenceDumper
{
    private $reference;

public function dump(ConfigurationInterface $configuration, $namespace = null)
    {
        return $this->dumpNode($configuration->getConfigTreeBuilder()->buildTree(), $namespace);
    }

public function dumpNode(NodeInterface $node, $namespace = null)
    {
        $this->reference = '';
        $this->writeNode($node, 0, true, $namespace);
        $ref = $this->reference;
        $this->reference = null;

return $ref;
    }

/**
     * @param NodeInterface $node
     * @param integer       $depth
     * @param Boolean       $root      If the node is the root node
     * @param string        $namespace The namespace of the node
     */
    private function writeNode(NodeInterface $node, $depth = 0, $root = false, $namespace = null)
    {
        $rootName = ($root ? 'config' : $node->getName());
        $rootNamespace = ($namespace ?: ($root ? 'http://example.org/schema/dic/'.$node->getName() : null));

// xml remapping
        if ($node->getParent()) {
            $remapping = array_filter($node->getParent()->getXmlRemappings(), function ($mapping) use ($rootName) {
                return $rootName === $mapping[1];
            });

if (count($remapping)) {
                list($singular, $plural) = current($remapping);
                $rootName = $singular;
            }
        }
        $rootName = str_replace('_', '-', $rootName);

$rootAttributes = array();
        $rootAttributeComments = array();
        $rootChildren = array();
        $rootComments = array();

if ($node instanceof ArrayNode) {
            $children = $node->getChildren();

// comments about the root node
            if ($rootInfo = $node->getInfo()) {
                $rootComments[] = $rootInfo;
            }

if ($rootNamespace) {
                $rootComments[] = 'Namespace: '.$rootNamespace;
            }

// render prototyped nodes
            if ($node instanceof PrototypedArrayNode) {
                array_unshift($rootComments, 'prototype');

if ($key = $node->getKeyAttribute()) {
                    $rootAttributes[$key] = str_replace('-', ' ', $rootName).' '.$key;
                }

$prototype = $node->getPrototype();

if ($prototype instanceof ArrayNode) {
                    $children = $prototype->getChildren();
                } else {
                    if ($prototype->hasDefaultValue()) {
                        $prototypeValue = $prototype->getDefaultValue();
                    } else {
                        switch (get_class($prototype)) {
                            case 'Symfony\Component\Config\Definition\ScalarNode':
                                $prototypeValue = 'scalar value';
                                break;

case 'Symfony\Component\Config\Definition\FloatNode':
                            case 'Symfony\Component\Config\Definition\IntegerNode':
                                $prototypeValue = 'numeric value';
                                break;

case 'Symfony\Component\Config\Definition\BooleanNode':
                                $prototypeValue = 'true|false';
                                break;

case 'Symfony\Component\Config\Definition\EnumNode':
                                $prototypeValue = implode('|', array_map('json_encode', $prototype->getValues()));
                                break;

default:
                                $prototypeValue = 'value';
                        }
                    }
                }
            }

// get attributes and elements
            foreach ($children as $child) {
                if (!$child instanceof ArrayNode) {
                    // get attributes

// metadata
                    $name  = str_replace('_', '-', $child->getName());
                    $value = '%%%%not_defined%%%%'; // use a string which isn't used in the normal world

// comments
                    $comments = array();
                    if ($info = $child->getInfo()) {
                        $comments[] = $info;
                    }

if ($example = $child->getExample()) {
                        $comments[] = 'Example: '.$example;
                    }

if ($child->isRequired()) {
                        $comments[] = 'Required';
                    }

if ($child instanceof EnumNode) {
                        $comments[] = 'One of '.implode('; ', array_map('json_encode', $child->getValues()));
                    }

if (count($comments)) {
                        $rootAttributeComments[$name] = implode(";\n", $comments);
                    }

// default values
                    if ($child->hasDefaultValue()) {
                        $value = $child->getDefaultValue();
                    }

// append attribute
                    $rootAttributes[$name] = $value;
                } else {
                    // get elements
                    $rootChildren[] = $child;
                }
            }
        }

// render comments

// root node comment
        if (count($rootComments)) {
            foreach ($rootComments as $comment) {
                $this->writeLine('', $depth);
            }
        }

// attribute comments
        if (count($rootAttributeComments)) {
            foreach ($rootAttributeComments as $attrName => $comment) {
                $commentDepth = $depth + 4 + strlen($attrName) + 2;
                $commentLines = explode("\n", $comment);
                $multiline = (count($commentLines) > 1);
                $comment = implode(PHP_EOL.str_repeat(' ', $commentDepth), $commentLines);

if ($multiline) {
                    $this->writeLine('', $depth);
                } else {
                    $this->writeLine('', $depth);
                }
            }
        }

// render start tag + attributes
        $rootIsVariablePrototype = isset($prototypeValue);
        $rootIsEmptyTag = (0 === count($rootChildren) && !$rootIsVariablePrototype);
        $rootOpenTag = '<'.$rootName;
        if (1 >= ($attributesCount = count($rootAttributes))) {
            if (1 === $attributesCount) {
                $rootOpenTag .= sprintf(' %s="%s"', current(array_keys($rootAttributes)), $this->writeValue(current($rootAttributes)));
            }

$rootOpenTag .= $rootIsEmptyTag ? ' />' : '>';

if ($rootIsVariablePrototype) {
                $rootOpenTag .= $prototypeValue.'</'.$rootName.'>';
            }

$this->writeLine($rootOpenTag, $depth);
        } else {
            $this->writeLine($rootOpenTag, $depth);

$i = 1;

foreach ($rootAttributes as $attrName => $attrValue) {
                $attr = sprintf('%s="%s"', $attrName, $this->writeValue($attrValue));

$this->writeLine($attr, $depth + 4);

if ($attributesCount === $i++) {
                    $this->writeLine($rootIsEmptyTag ? '/>' : '>', $depth);

if ($rootIsVariablePrototype) {
                        $rootOpenTag .= $prototypeValue.'</'.$rootName.'>';
                    }
                }
            }
        }

// render children tags
        foreach ($rootChildren as $child) {
            $this->writeLine('');
            $this->writeNode($child, $depth + 4);
        }

// render end tag
        if (!$rootIsEmptyTag && !$rootIsVariablePrototype) {
            $this->writeLine('');

$rootEndTag = '</'.$rootName.'>';
            $this->writeLine($rootEndTag, $depth);
        }
    }

/**
     * Outputs a single config reference line
     *
     * @param string $text
     * @param int    $indent
     */
    private function writeLine($text, $indent = 0)
    {
        $indent = strlen($text) + $indent;
        $format = '%'.$indent.'s';

$this->reference .= sprintf($format, $text)."\n";
    }

/**
     * Renders the string conversion of the value.
     *
     * @param mixed $value
     *
     * @return string
     */
    private function writeValue($value)
    {
        if ('%%%%not_defined%%%%' === $value) {
            return '';
        }

if (is_string($value) || is_numeric($value)) {
            return $value;
        }

if (false === $value) {
            return 'false';
        }

if (true === $value) {
            return 'true';
        }

if (null === $value) {
            return 'null';
        }

if (empty($value)) {
            return '';
        }

if (is_array($value)) {
            return implode(',', $value);
        }
    }
}

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EDIT :: XmlReferenceDumper.php