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<?php |
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/** |
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* Author: Nil Portugués Calderó <[email protected]> |
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* Date: 25/12/15 |
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* Time: 22:27. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace NilPortugues\Api\Hal; |
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use DOMDocument; |
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use SimpleXMLElement; |
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/** |
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* This Transformer follows the JSON+HAL specification. |
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* |
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* @link http://stateless.co/hal_specification.html |
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*/ |
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class XmlTransformer extends JsonTransformer implements HalTransformer |
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{ |
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/** |
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* @var array |
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*/ |
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private $linkKeys = [ |
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JsonTransformer::LINKS_HREF, |
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JsonTransformer::LINKS_HREF_LANG_KEY, |
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JsonTransformer::LINKS_TITLE_KEY, |
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JsonTransformer::LINKS_TYPE_KEY, |
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]; |
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/** |
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* @param mixed $data |
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* |
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* @return string |
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*/ |
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protected function outputStrategy(array &$data) |
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{ |
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$xmlData = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><resource></resource>'); |
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$this->arrayToXml($data, $xmlData); |
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if (!empty($data[JsonTransformer::LINKS_KEY][JsonTransformer::SELF_LINK][JsonTransformer::LINKS_HREF])) { |
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$xmlData->addAttribute( |
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JsonTransformer::LINKS_HREF, |
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$data[JsonTransformer::LINKS_KEY][JsonTransformer::SELF_LINK][JsonTransformer::LINKS_HREF] |
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); |
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} |
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$xml = $xmlData->asXML(); |
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$xmlDoc = new DOMDocument(); |
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$xmlDoc->loadXML($xml); |
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$xmlDoc->preserveWhiteSpace = false; |
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$xmlDoc->formatOutput = true; |
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$xmlDoc->substituteEntities = false; |
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return rtrim(html_entity_decode($xmlDoc->saveXML()), "\n"); |
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} |
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/** |
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* Converts an array to XML using SimpleXMLElement. |
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* |
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* @param array $data |
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* @param SimpleXMLElement $xmlData |
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*/ |
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private function arrayToXml(array &$data, SimpleXMLElement $xmlData) |
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{ |
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foreach ($data as $key => $value) { |
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$key = ltrim($key, '_'); |
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if (\is_array($value)) { |
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if (\is_numeric($key)) { |
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$key = 'resource'; |
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} |
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if (false === empty($value[JsonTransformer::LINKS_HREF])) { |
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$subnode = $xmlData->addChild('link'); |
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$subnode->addAttribute('rel', $key); |
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foreach ($this->linkKeys as $linkKey) { |
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if (!empty($value[$linkKey])) { |
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$subnode->addAttribute($linkKey, $value[$linkKey]); |
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} |
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} |
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} else { |
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if (!empty($value[JsonTransformer::LINKS_KEY][JsonTransformer::SELF_LINK][JsonTransformer::LINKS_HREF])) { |
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$subnode = $xmlData->addChild('resource'); |
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$subnode->addAttribute( |
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JsonTransformer::LINKS_HREF, |
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$value[JsonTransformer::LINKS_KEY][JsonTransformer::SELF_LINK][JsonTransformer::LINKS_HREF] |
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); |
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if ($key !== 'resource') { |
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$subnode->addAttribute('rel', $key); |
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} |
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} else { |
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$subnode = $xmlData->addChild($key); |
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} |
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} |
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$this->arrayToXml($value, $subnode); |
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} else { |
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if ($key !== JsonTransformer::LINKS_HREF) { |
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if ($value === true || $value === false) { |
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$value = ($value) ? 'true' : 'false'; |
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} |
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$xmlData->addChild("$key", '<![CDATA['.html_entity_decode($value).']]>'); |
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} |
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} |
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} |
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} |
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} |
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nilportugues /
hal-transformer
