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<?php |
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namespace Pixie\JSON; |
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use Pixie\Exception; |
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use Pixie\Connection; |
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use Pixie\HasConnection; |
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use Pixie\QueryBuilder\TablePrefixer; |
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class JsonSelectorHandler implements HasConnection |
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{ |
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use TablePrefixer; |
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/** @var Connection */ |
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protected $connection; |
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public function __construct(Connection $connection) |
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{ |
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$this->connection = $connection; |
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} |
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/** |
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* Returns the current connection instance. |
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* |
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* @return connection |
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*/ |
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public function getConnection(): Connection |
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{ |
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return $this->connection; |
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} |
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/** |
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* Checks if the passed expression is for JSON |
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* this->denotes->json |
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* |
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* @param string $expression |
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* @return bool |
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*/ |
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public function isJsonSelector($expression): bool |
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{ |
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return is_string($expression) |
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&& 2 <= count(array_diff(explode('->', $expression), array(""))); |
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} |
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/** |
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* Gets the column name form a potential array |
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* |
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* @param string $expression |
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* @return string |
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* @throws Exception If invalid JSON Selector string passed. |
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*/ |
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public function getColumn(string $expression): string |
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{ |
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return $this->toJsonSelector($expression)->getColumn(); |
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} |
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/** |
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* Gets all JSON object keys while removing the column name. |
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* |
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* @param string $expression |
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* @return string[] |
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* @throws Exception If invalid JSON Selector string passed. |
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*/ |
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public function getNodes(string $expression): array |
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{ |
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return $this->toJsonSelector($expression)->getNodes(); |
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} |
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/** |
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* Casts a valid JSON selector to a JsonSelector object. |
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* |
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* @param string $expression |
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* @return JsonSelector |
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* @throws Exception If invalid JSON Selector string passed. |
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*/ |
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public function toJsonSelector(string $expression): JsonSelector |
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{ |
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if (! $this->isJsonSelector($expression)) { |
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throw new Exception('JSON expression must contain at least 2 values, the table column and at least 1 node.', 1); |
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} |
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/** @var string[] Check done above. */ |
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$parts = array_diff(explode('->', $expression), array("")); |
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$column = array_shift($parts); |
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$nodes = $parts; |
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if (! is_string($column)) { |
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throw new Exception('JSON expression must contain a valid column name', 1); |
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} |
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return new JsonSelector($column, $nodes); |
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} |
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} |
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gin0115 /
pixie-wpdb
