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<?php declare(strict_types=1); |
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namespace Igni\Application; |
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use Igni\Application\Exception\ConfigException; |
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/** |
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* Application's config container. |
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* Treats dots as an operator for accessing nested values. |
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* If constant name is put in curly braces as a value, it wil be replaced |
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* to the constant value. |
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* |
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* @example: |
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* // Example usage. |
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* $config = new Config(); |
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* $config->set('some.key', true); |
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* $some = $config->get('some'); // returns ['key' => true] |
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* |
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* @package Igni\Application |
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*/ |
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class Config |
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{ |
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/** |
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* @var array |
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*/ |
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private $config; |
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/** |
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* Config constructor. |
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* |
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* @param array $config |
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*/ |
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public function __construct(array $config = []) |
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{ |
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$this->config = $config; |
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} |
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/** |
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* Checks if config key exists. |
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* |
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* @param string $key |
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* @return bool |
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*/ |
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public function has(string $key): bool |
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{ |
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return $this->lookup($key) !== null; |
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} |
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private function lookup(string $key) |
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{ |
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$result = $this->config; |
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$key = explode('.', $key); |
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foreach($key as $part) { |
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if (!is_array($result) || !isset($result[$part])) { |
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return null; |
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} |
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$result = $result[$part]; |
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} |
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return $result; |
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} |
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/** |
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* Gets value behind the key, or returns $default value if path does not exists. |
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* |
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* @param string $key |
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* @param null $default |
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* @return null|string|string[] |
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*/ |
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public function get(string $key, $default = null) |
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{ |
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$result = $this->lookup($key); |
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return $result === null ? $default : $this->fetchConstants($result); |
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} |
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/** |
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* Merges one instance of Config class into current one and |
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* returns current instance. |
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* |
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* @param Config $config |
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* @return Config |
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*/ |
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public function merge(Config $config): Config |
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{ |
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$this->config = array_merge_recursive($this->config, $config->config); |
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return $this; |
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} |
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/** |
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* Returns new instance of the config containing only values from the |
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* given namespace. |
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* |
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* @param string $namespace |
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* @return Config |
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*/ |
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public function extract(string $namespace): Config |
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{ |
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$extracted = $this->get($namespace); |
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if (!is_array($extracted)) { |
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throw ConfigException::forExtractionFailure($namespace); |
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} |
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return new self($extracted); |
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} |
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/** |
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* Sets new value. |
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* |
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* @param string $key |
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* @param $value |
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*/ |
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public function set(string $key, $value): void |
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{ |
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$key = explode('.', $key); |
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$last = array_pop($key); |
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$result = &$this->config; |
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foreach ($key as $part) { |
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if (!isset($result[$part]) || !is_array($result[$part])) { |
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$result[$part] = []; |
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} |
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$result = &$result[$part]; |
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} |
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$result[$last] = $value; |
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} |
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/** |
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* Returns array representation of the config. |
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* |
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* @return array |
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*/ |
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public function toArray(): array |
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{ |
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return $this->config; |
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} |
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/** |
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* Returns flat array representation of the config, all nested values are stored |
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* in keys containing path separated by dot. |
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* |
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* @return array |
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*/ |
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public function toFlatArray(): array |
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{ |
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return self::flatten($this->config); |
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} |
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private static function flatten(array &$array, string $prefix = ''): array |
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{ |
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$values = []; |
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foreach ($array as $key => &$value) { |
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if (is_array($value) && !empty($value)) { |
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$values = array_merge($values, self::flatten($value, $prefix . $key . '.')); |
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} else { |
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$values[$prefix . $key] = $value; |
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} |
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} |
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return $values; |
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} |
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private function fetchConstants($value) |
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{ |
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if (!is_string($value)) { |
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return $value; |
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} |
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return preg_replace_callback( |
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'#\$\{([^{}]*)\}#', |
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function($matches) { |
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if (defined($matches[1])) { |
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return constant($matches[1]); |
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} |
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return $matches[0]; |
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}, |
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$value |
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); |
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} |
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} |
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igniphp /
framework
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