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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 07:28 |
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*/ |
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namespace samsonframework\stringconditiontree\string; |
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/** |
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* This class describes string structure character group. |
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* |
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* @author Vitaly Egorov <[email protected]> |
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*/ |
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abstract class AbstractCG |
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{ |
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/** string Character group matching regexp pattern matching group name */ |
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const PATTERN_GROUP = ''; |
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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 = ''; |
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/** @var int Character group length */ |
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protected $length; |
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/** @var string Character group string */ |
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protected $string; |
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/** |
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* AbstractCharacterGroup constructor. |
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* |
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* @param string $string Character group string |
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* @param int $length Character group length |
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*/ |
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public function __construct(string $string, int $length = null) |
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{ |
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$this->string = $string; |
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$this->length = $length ?? strlen($string); |
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} |
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/** |
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* Create character group from string string. |
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* |
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* @param string $input Input string |
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* |
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* @return null|AbstractCG|FixedCG|VariableCG Character group instance |
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*/ |
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public static function fromString(string &$input): ?AbstractCG |
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{ |
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if (preg_match('/^'.static::PATTERN.'/', $input, $matches)) { |
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// Replace only first occurrence of character group |
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if (($pos = strpos($input, $matches[0])) !== false) { |
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$input = substr_replace($input, '', $pos, strlen($matches[0])); |
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$className = static::class; |
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return new $className($matches[static::PATTERN_GROUP], strlen($matches[static::PATTERN_GROUP])); |
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} |
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} |
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return null; |
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} |
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/** |
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* Compare character groups. |
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* |
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* @param AbstractCG|FixedCG|VariableCG|VariableFixedCG $group Compared character group |
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* |
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* @return int -1, 0, 1 Lower, equal, higher |
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*/ |
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abstract public function compare(AbstractCG $group): int; |
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/** |
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* Check if compared character group has same type. |
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* |
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* @param AbstractCG $group Compared character group |
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* |
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* @return bool True if character group has same type otherwise false |
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*/ |
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public function isSameType(AbstractCG $group): bool |
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{ |
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return get_class($group) === get_class($this); |
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} |
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/** |
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* Get two character groups longest common prefix. |
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* |
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* @param AbstractCG|FixedCG|VariableCG|VariableFixedCG $group Compared character group |
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* |
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* @return string Longest common prefix or empty string |
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*/ |
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abstract public function getCommonPrefix(AbstractCG $group): string; |
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/** |
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* @return string Character group string |
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*/ |
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public function getString(): string |
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{ |
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return $this->string; |
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} |
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/** |
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* Same character group type comparison. |
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* |
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* @param AbstractCG|FixedCG|VariableCG|VariableFixedCG $group Compared character group |
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* |
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* @return int -1, 0, 1 Character groups comparison result |
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*/ |
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abstract protected function compareLength(AbstractCG $group): int; |
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} |
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samsonframework /
string-condition-tree
