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<?php |
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/** |
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* Functions class. |
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* @author Alexander Prokhorov |
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* @license Simplified BSD |
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* @link https://github.com/Athari/YaLinqo YaLinqo on GitHub |
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*/ |
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namespace YaLinqo; |
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/** |
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* Container for standard functions in the form of closures. |
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* @package YaLinqo |
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*/ |
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class Functions |
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{ |
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* Identity function: returns the only argument. |
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* @var callable {(x) ==> x} |
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*/ |
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public static $identity; |
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/** |
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* Key function: returns the second argument of two. |
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* @var callable {(v, k) ==> k} |
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*/ |
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public static $key; |
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/** |
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* Value function: returns the first argument of two. |
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* @var callable {(v, k) ==> v} |
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*/ |
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public static $value; |
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/** |
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* True function: returns true. |
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* @var callable {() ==> true} |
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*/ |
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public static $true; |
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/** |
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* False function: returns false. |
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* @var callable {() ==> false} |
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*/ |
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public static $false; |
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/** |
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* Blank function: does nothing. |
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* @var callable {() ==> {}} |
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*/ |
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public static $blank; |
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/** |
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* Compare strict function: returns -1, 0 or 1 based on === and > operators. |
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* @var callable |
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*/ |
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public static $compareStrict; |
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/** |
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* Compare strict function reversed: returns 1, 0 or -1 based on === and > operators. |
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* @var callable |
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*/ |
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public static $compareStrictReversed; |
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/** |
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* Compare loose function: returns -1, 0 or 1 based on == and > operators. |
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* @var callable |
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*/ |
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public static $compareLoose; |
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/** |
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* Compare loose function reversed: returns 1, 0 or -1 based on == and > operators. |
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* @var callable |
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*/ |
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public static $compareLooseReversed; |
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/** |
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* Compare int function: returns the difference between the first and the second argument. |
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* @var callable |
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*/ |
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public static $compareInt; |
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/** |
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* Compare int function reversed: returns the difference between the second and the first argument. |
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* @var callable |
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*/ |
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public static $compareIntReversed; |
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/** @internal */ |
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public static function init() |
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{ |
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self::$identity = function($x) { return $x; }; |
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/** @noinspection PhpUnusedParameterInspection */ |
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self::$key = function($v, $k) { return $k; }; |
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/** @noinspection PhpUnusedParameterInspection */ |
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self::$value = function($v, $k) { return $v; }; |
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self::$true = function() { return true; }; |
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self::$false = function() { return false; }; |
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self::$blank = function() { }; |
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self::$compareStrict = function($a, $b) { |
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if ($a === $b) |
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return 0; |
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elseif ($a > $b) |
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return 1; |
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else |
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return -1; |
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}; |
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self::$compareStrictReversed = function($a, $b) { |
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if ($a === $b) |
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return 0; |
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elseif ($a > $b) |
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return -1; |
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else |
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return 1; |
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}; |
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self::$compareLoose = function($a, $b) { |
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if ($a == $b) |
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return 0; |
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elseif ($a > $b) |
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return 1; |
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else |
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return -1; |
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}; |
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self::$compareLooseReversed = function($a, $b) { |
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if ($a == $b) |
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return 0; |
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elseif ($a > $b) |
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return -1; |
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else |
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return 1; |
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}; |
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self::$compareInt = function($a, $b) { |
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return $a - $b; |
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}; |
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self::$compareIntReversed = function($a, $b) { |
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return $b - $a; |
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}; |
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} |
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/** |
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* Increment function: returns incremental integers starting from 0. |
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* @return callable |
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*/ |
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public static function increment() |
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{ |
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$i = 0; |
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return function() use (&$i) { return $i++; }; |
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} |
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} |
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Athari /
YaLinqo
