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<?php |
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namespace TreeHouse\Feeder\Modifier\Item\Transformer; |
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use Symfony\Component\HttpFoundation\ParameterBag; |
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use TreeHouse\Feeder\Exception\UnexpectedTypeException; |
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class ExpandAttributesTransformer implements TransformerInterface |
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{ |
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/** |
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* @var string |
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*/ |
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protected $field; |
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/** |
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* @var bool |
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*/ |
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protected $removeOriginal; |
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/** |
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* @var array |
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*/ |
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protected $overwriteExisting; |
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/** |
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* @param string $field Expand attributes in this field, if omitted, all root-level attributes are |
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* expanded |
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* @param bool $removeOriginal Whether to remove the original attribute |
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* @param array $overwriteExisting Keys that may be overwritten when they already exist |
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* |
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* @throws UnexpectedTypeException |
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*/ |
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public function __construct($field = null, $removeOriginal = false, array $overwriteExisting = []) |
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{ |
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if (!is_string($field) && !is_null($field)) { |
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throw new UnexpectedTypeException($field, 'string or null'); |
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} |
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$this->field = $field; |
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$this->removeOriginal = $removeOriginal; |
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$this->overwriteExisting = $overwriteExisting; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function transform(ParameterBag $item) |
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{ |
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if (!$this->field) { |
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// expand root-level attributes |
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$item->replace($this->expand($item->all())); |
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return; |
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} |
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// proceed only when the field exists and is an array |
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$value = $item->get($this->field); |
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if (!is_array($value)) { |
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return; |
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} |
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$item->set($this->field, $this->expand($value)); |
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} |
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/** |
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* @param array $value |
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* |
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* @return array |
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*/ |
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protected function expand(array $value) |
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{ |
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foreach ($value as $name => $val) { |
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// attributes are converted to @attribute |
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if (substr($name, 0, 1) === '@') { |
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if ($this->removeOriginal) { |
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unset($value[$name]); |
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} |
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// the new name |
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$name = ltrim($name, '@'); |
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// if key already exists, check if we may overwrite it |
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if (array_key_exists($name, $value) && !in_array($name, $this->overwriteExisting)) { |
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continue; |
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} |
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$value[$name] = $val; |
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} |
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} |
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return $value; |
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} |
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} |
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treehouselabs /
feeder
