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<?php declare(strict_types=1); |
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/** |
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* Created by Vitaly Iegorov <[email protected]>. |
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* on 06.04.17 at 07:34 |
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*/ |
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namespace samsonframework\stringconditiontree\string; |
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/** |
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* This class describes character group with variable length. |
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* |
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* @author Vitaly Egorov <[email protected]> |
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*/ |
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class VariableCG extends AbstractCG |
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{ |
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/** string Regular expression named filter group */ |
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const PATTERN_FILTER_GROUP = 'filter'; |
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/** string Variable string filter pattern */ |
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const PATTER_FILTER = '/.*?:(?<'.self::PATTERN_FILTER_GROUP.'>[^}]+)/'; |
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/** string Regular expression named character group group */ |
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const PATTERN_GROUP = 'variable'; |
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/** string Regular expression matching character group */ |
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const PATTERN_REGEXP = '{.*?}'; |
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/** string Character group matching regexp pattern */ |
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const PATTERN = '(?<'.self::PATTERN_GROUP.'>'.self::PATTERN_REGEXP.')'; |
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/** @var string Variable character group filter string */ |
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protected $filter; |
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/** |
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* @inheritdoc |
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*/ |
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public function __construct($string, $length = 0) |
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{ |
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parent::__construct($string, $length); |
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$this->filter = $this->getFilter(); |
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} |
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/** |
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* Get variable character group filter value. |
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* |
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* @return string Filter value or empty string |
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*/ |
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protected function getFilter(): string |
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{ |
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if (preg_match(static::PATTER_FILTER, $this->string, $matches)) { |
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return $matches[self::PATTERN_FILTER_GROUP]; |
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} |
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return ''; |
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} |
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/** |
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* Whole variable length string should match. |
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* |
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* @inheritdoc |
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*/ |
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public function getCommonPrefix(AbstractCG $group): string |
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{ |
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if ($this->isSameType($group)) { |
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return $this->string === $group->string ? $this->string : ''; |
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} |
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// Pass to compared |
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return $group->getCommonPrefix($this); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function compare(AbstractCG $group): int |
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{ |
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/** |
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* Shorter fixed character group has higher priority |
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*/ |
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if ($this->isSameType($group)) { |
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return $this->compareLength($group); |
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} |
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// Variable character group always has lower priority |
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return -1; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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protected function compareLength(AbstractCG $group): int |
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{ |
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/** @var VariableCG $group */ |
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$variableFiltered = $this->isFiltered(); |
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$comparedFiltered = $group->isFiltered(); |
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/** |
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* Both variable character groups are filtered |
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* longer variable character groups has higher priority. |
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*/ |
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if ($variableFiltered && $comparedFiltered) { |
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return strlen($this->filter) <=> strlen($group->filter); |
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} |
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// Only this variable character group is filtered |
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if ($variableFiltered && $comparedFiltered === false) { |
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return 1; |
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} |
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// Only compared variable character group is filtered |
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if ($variableFiltered === false && $comparedFiltered) { |
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return -1; |
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} |
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// 1 - 1 - longest |
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// 1 - 0 - 1 |
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// 0 - 1 - -1 |
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// 0 - 0 - 0 |
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// Consider both variable character groups are not filtered |
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return 0; |
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} |
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/** |
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* @return bool Return true if variable character group has filter |
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*/ |
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17 |
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protected function isFiltered(): bool |
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{ |
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return $this->filter !== ''; |
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} |
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} |
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samsonframework /
string-condition-tree
