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<?php |
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//---------------------------------------------------------------------- |
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// |
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// Copyright (C) 2015-2021 Artem Rodygin |
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// |
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// You should have received a copy of the MIT License along with |
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// this file. If not, see <http://opensource.org/licenses/MIT>. |
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// |
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//---------------------------------------------------------------------- |
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namespace Dictionary; |
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/** |
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* Abstract static dictionary of key/value pairs. |
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*/ |
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abstract class StaticDictionary implements StaticDictionaryInterface |
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{ |
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// Fallback key of the default value to return on non-existing keys. |
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public const FALLBACK = null; |
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/** |
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* @var array Dictionary values (to be overloaded). |
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*/ |
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protected static array $dictionary = []; |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function all(): array |
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{ |
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return static::dictionary(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function get($key) |
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{ |
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$dictionary = static::dictionary(); |
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if (array_key_exists($key, $dictionary)) { |
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return $dictionary[$key]; |
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} |
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return static::FALLBACK === null ? null : $dictionary[static::FALLBACK]; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function has($key): bool |
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{ |
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return array_key_exists($key, static::dictionary()); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function find($value) |
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{ |
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$key = array_search($value, static::dictionary(), true); |
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return $key === false ? static::FALLBACK : $key; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function keys(): array |
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{ |
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return array_keys(static::dictionary()); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function values(): array |
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{ |
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return array_values(static::dictionary()); |
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} |
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/** |
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* Returns dictionary. |
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* |
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* @return array |
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*/ |
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protected static function dictionary(): array |
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{ |
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return static::$dictionary; |
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} |
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} |
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