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<?php |
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/** |
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* This file is part of PHP-Typography. |
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* |
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* Copyright 2017 Peter Putzer. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* |
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* *** |
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* |
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* @package mundschenk-at/php-typography |
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* @license http://www.gnu.org/licenses/gpl-2.0.html |
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*/ |
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namespace PHP_Typography\Hyphenator; |
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use PHP_Typography\Strings; |
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/** |
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* A hyphenation pattern trie node. |
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* |
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* Portions of this code have been inspired by: |
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* - hyphenator-php (https://nikonyrh.github.io/phphyphenation.html) |
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* |
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* @author Peter Putzer <[email protected]> |
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* |
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* @since 5.0.0 |
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*/ |
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final class Trie_Node { |
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/** |
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* The offsets array. |
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* |
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* @var array |
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*/ |
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private $offsets = []; |
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/** |
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* Linked trie nodes. |
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* |
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* @var array { |
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* @type Trie_Node $char The next node in the given character path. |
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* } |
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*/ |
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private $links = []; |
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/** |
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* Create new Trie_Node. |
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*/ |
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private function __construct() { |
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} |
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/** |
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* Retrieves the node for the given letter (or creates it). |
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* |
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* @param string $char A single character. |
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* |
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* @return Trie_Node |
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*/ |
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public function get_node( $char ) { |
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if ( ! isset( $this->links[ $char ] ) ) { |
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$this->links[ $char ] = new Trie_Node(); |
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} |
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return $this->links[ $char ]; |
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} |
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/** |
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* Checks if there is a node for the given letter. |
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* |
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* @param string $char A single character. |
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* |
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* @return bool |
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*/ |
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public function exists( $char ) { |
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return ! empty( $this->links[ $char ] ); |
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} |
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/** |
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* Retrieves the offsets array. |
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* |
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* @return array |
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*/ |
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public function offsets() { |
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return $this->offsets; |
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} |
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/** |
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* Builds pattern search trie from pattern list(s). |
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* |
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* @param array $patterns An array of hyphenation patterns. |
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* |
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* @return Trie_Node The starting node of the trie. |
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*/ |
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public static function build_trie( array $patterns ) { |
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$trie = new Trie_Node(); |
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foreach ( $patterns as $key => $pattern ) { |
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$node = $trie; |
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foreach ( Strings::mb_str_split( $key ) as $char ) { |
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$node = $node->get_node( $char ); |
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} |
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\preg_match_all( '/([1-9])/S', $pattern, $offsets, PREG_OFFSET_CAPTURE ); |
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$node->offsets = $offsets[1]; |
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} |
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return $trie; |
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} |
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} |
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mundschenk-at /
php-typography
