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<?php |
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/** |
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* Linna Filter |
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* |
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* @author Sebastian Rapetti <[email protected]> |
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* @copyright (c) 2018, Sebastian Rapetti |
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* @license http://opensource.org/licenses/MIT MIT License |
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*/ |
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declare(strict_types = 1); |
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namespace Linna\Filter; |
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use OutOfBoundsException; |
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/** |
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* Parser |
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*/ |
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class Parser |
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{ |
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/** |
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* @var array Parsing rules. |
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*/ |
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private $rules; |
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/** |
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* Parser. |
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* |
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* @param array $array |
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*/ |
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public function parse(array $array, array $rules): array |
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{ |
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$this->rules = $rules; |
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$this->extractParams($array); |
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$this->applyTypes($array); |
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$this->normalizeParam($array); |
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return $array; |
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} |
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/** |
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* Separate keywords from parameters. |
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* |
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* @param array $words |
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*/ |
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private function extractParams(array &$words): void |
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{ |
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$array = []; |
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$actualWord = ''; |
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$field = $words[0]; |
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$count = count($words); |
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$arguments = -1; |
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for ($i = 1; $i < $count; $i++) { |
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$word = strtolower($words[$i]); |
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if (isset($this->rules[$word])) { |
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$arguments = $this->rules[$word]['args_count']; |
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$actualWord = $word; |
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$array[$field][$word] = []; |
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continue; |
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} |
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if (--$arguments < 0){ |
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throw new OutOfBoundsException("{$word} isn't a valid filter"); |
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} |
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$array[$field][$actualWord][] = $words[$i]; |
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} |
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$words = $array; |
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} |
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/** |
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* Apply types to rules parameters. |
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* |
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* @param array $words |
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*/ |
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private function applyTypes(array &$words): void |
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{ |
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$rules = $this->rules; |
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$field = key($words); |
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foreach ($words[$field] as $key => $word) { |
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$rule = $rules[$key]; |
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$keyword = $rule['keyword']; |
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//first param passed as reference |
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$this->castTypes($words[$field][$keyword], $rule['args_type']); |
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} |
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} |
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/** |
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* Organize rules' array. |
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* |
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* @param array $words |
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*/ |
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private function normalizeParam(array &$words): void |
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{ |
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$field = array_keys($words)[0]; |
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$temp = []; |
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foreach ($words[$field] as $key => $word) { |
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if (count($word) === 0) { |
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$words[$field][$key] = true; |
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} |
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if (count($word) === 1) { |
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$words[$field][$key] = $word[0]; |
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} |
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$temp[] = [$field, $key, $this->rules[$key], $words[$field][$key]]; |
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} |
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$words = $temp; |
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} |
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/** |
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* Apply types when there is one parameter. |
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* |
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* @param array $params |
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* @param array $types |
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*/ |
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private function castTypes(array &$params, array $types): void |
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{ |
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$count = count($params); |
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for ($i = 0; $i < $count; $i++) { |
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$type = &$types[$i]; |
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$param = &$params[$i]; |
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if ($type === 'number') { |
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settype($param, $this->strtonum($param)); |
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continue; |
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} |
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settype($param, $type); |
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} |
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} |
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/** |
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* Identify correct number type. |
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* |
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* @param string $number |
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* |
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* @return string |
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*/ |
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private function strtonum(string $number): string |
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{ |
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if (fmod((float) $number, 1.0) !== 0.0) { |
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return 'float'; |
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} |
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return 'integer'; |
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} |
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} |
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linna /
filter
