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<?php
namespace Illuminate\Http\Resources;
use Illuminate\Support\Arr;
trait ConditionallyLoadsAttributes
{
/**
* Filter the given data, removing any optional values.
*
* @param array $data
* @return array
*/
protected function filter($data)
{
$index = -1;
foreach ($data as $key => $value) {
$index++;
if (is_array($value)) {
$data[$key] = $this->filter($value);
continue;
}
if (is_numeric($key) && $value instanceof MergeValue) {
return $this->mergeData(
$data, $index, $this->filter($value->data),
array_values($value->data) === $value->data
);
}
if ($value instanceof self && is_null($value->resource)) {
$data[$key] = null;
}
}
return $this->removeMissingValues($data);
}
/**
* Merge the given data in at the given index.
*
* @param array $data
* @param int $index
* @param array $merge
* @param bool $numericKeys
* @return array
*/
protected function mergeData($data, $index, $merge, $numericKeys)
{
if ($numericKeys) {
return $this->removeMissingValues(array_merge(
array_merge(array_slice($data, 0, $index, true), $merge),
$this->filter(array_values(array_slice($data, $index + 1, null, true)))
));
}
return $this->removeMissingValues(array_slice($data, 0, $index, true) +
$merge +
$this->filter(array_slice($data, $index + 1, null, true)));
}
/**
* Remove the missing values from the filtered data.
*
* @param array $data
* @return array
*/
protected function removeMissingValues($data)
{
$numericKeys = true;
foreach ($data as $key => $value) {
if (($value instanceof PotentiallyMissing && $value->isMissing()) ||
($value instanceof self &&
$value->resource instanceof PotentiallyMissing &&
$value->isMissing())) {
unset($data[$key]);
} else {
$numericKeys = $numericKeys && is_numeric($key);
}
}
if (property_exists($this, 'preserveKeys') && $this->preserveKeys === true) {
return $data;
}
return $numericKeys ? array_values($data) : $data;
}
/**
* Retrieve a value based on a given condition.
*
* @param bool $condition
* @param mixed $value
* @param mixed $default
* @return \Illuminate\Http\Resources\MissingValue|mixed
*/
protected function when($condition, $value, $default = null)
{
if ($condition) {
return value($value);
}
return func_num_args() === 3 ? value($default) : new MissingValue;
}
/**
* Merge a value into the array.
*
* @param mixed $value
* @return \Illuminate\Http\Resources\MergeValue|mixed
*/
protected function merge($value)
{
return $this->mergeWhen(true, $value);
}
/**
* Merge a value based on a given condition.
*
* @param bool $condition
* @param mixed $value
* @return \Illuminate\Http\Resources\MergeValue|mixed
*/
protected function mergeWhen($condition, $value)
{
return $condition ? new MergeValue(value($value)) : new MissingValue;
}
/**
* Merge the given attributes.
*
* @param array $attributes
* @return \Illuminate\Http\Resources\MergeValue
*/
protected function attributes($attributes)
{
return new MergeValue(
Arr::only($this->resource->toArray(), $attributes)
);
}
/**
* Retrieve a relationship if it has been loaded.
*
* @param string $relationship
* @param mixed $value
* @param mixed $default
* @return \Illuminate\Http\Resources\MissingValue|mixed
*/
protected function whenLoaded($relationship, $value = null, $default = null)
{
if (func_num_args() < 3) {
$default = new MissingValue;
}
if (! $this->resource->relationLoaded($relationship)) {
return value($default);
}
if (func_num_args() === 1) {
return $this->resource->{$relationship};
}
if ($this->resource->{$relationship} === null) {
return;
}
return value($value);
}
/**
* Execute a callback if the given pivot table has been loaded.
*
* @param string $table
* @param mixed $value
* @param mixed $default
* @return \Illuminate\Http\Resources\MissingValue|mixed
*/
protected function whenPivotLoaded($table, $value, $default = null)
{
return $this->whenPivotLoadedAs('pivot', ...func_get_args());
}
/**
* Execute a callback if the given pivot table with a custom accessor has been loaded.
*
* @param string $accessor
* @param string $table
* @param mixed $value
* @param mixed $default
* @return \Illuminate\Http\Resources\MissingValue|mixed
*/
protected function whenPivotLoadedAs($accessor, $table, $value, $default = null)
{
if (func_num_args() === 3) {
$default = new MissingValue;
}
return $this->when(
$this->resource->$accessor &&
($this->resource->$accessor instanceof $table ||
$this->resource->$accessor->getTable() === $table),
...[$value, $default]
);
}
/**
* Transform the given value if it is present.
*
* @param mixed $value
* @param callable $callback
* @param mixed $default
* @return mixed
*/
protected function transform($value, callable $callback, $default = null)
{
return transform(
$value, $callback, func_num_args() === 3 ? $default : new MissingValue
);
}
}
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