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<?php |
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/** |
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* Utils 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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* Functions for creating lambdas. |
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* @internal |
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* @package YaLinqo |
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*/ |
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class Utils |
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{ |
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const ERROR_CLOSURE_NULL = 'closure must not be null.'; |
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const ERROR_CLOSURE_NOT_CALLABLE = 'closure must be callable'; |
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const ERROR_CANNOT_PARSE_LAMBDA = 'Failed to parse closure as lambda.'; |
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/** Cache for createLambdaFromString function. Functions indexed by function code and function arguments as strings. @var array */ |
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private static $lambdaCache; |
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/** Map from comparison functions names to sort flags. Used in lambdaToSortFlagsAndOrder. @var array */ |
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private static $compareFunctionToSortFlags = [ |
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null => SORT_REGULAR, |
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'strcmp' => SORT_STRING, |
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'strcasecmp' => 10 /*SORT_STRING | SORT_FLAG_CASE*/, |
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'strcoll' => SORT_LOCALE_STRING, |
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'strnatcmp' => SORT_NATURAL, |
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'strnatcasecmp' => 14 /*SORT_NATURAL | SORT_FLAG_CASE*/, |
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]; |
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/** |
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* @codeCoverageIgnore |
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* @internal |
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*/ |
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public static function init() |
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{ |
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self::$lambdaCache = [ |
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'$v' => [ 'v,k' => Functions::$value ], |
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'$k' => [ 'v,k' => Functions::$key ], |
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]; |
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} |
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/** |
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* Convert string lambda to callable function. If callable is passed, return as is. |
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* @param callable|null $closure |
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* @param string $closureArgs |
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* @param \Closure|callable|null $default |
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* @throws \InvalidArgumentException Both closure and default are null. |
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* @throws \InvalidArgumentException Incorrect lambda syntax. |
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* @return callable|null |
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*/ |
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public static function createLambda($closure, string $closureArgs, $default = null) |
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{ |
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if ($closure === null) { |
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if ($default === null) |
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throw new \InvalidArgumentException(self::ERROR_CLOSURE_NULL); |
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return $default; |
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} |
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if ($closure instanceof \Closure) |
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return $closure; |
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if (is_string($closure) && ($function = self::createLambdaFromString($closure, $closureArgs))) |
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return $function; |
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if (is_callable($closure)) |
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return $closure; |
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throw new \InvalidArgumentException(self::ERROR_CLOSURE_NOT_CALLABLE); |
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} |
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/** |
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* Convert string lambda or SORT_ flags to callable function. Sets isReversed to false if descending is reversed. |
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* @param callable|int|null $closure |
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* @param int $sortOrder |
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* @param bool $isReversed |
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* @return callable|string|null |
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* @throws \InvalidArgumentException Incorrect lambda syntax. |
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* @throws \InvalidArgumentException Incorrect SORT_ flags. |
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*/ |
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public static function createComparer($closure, $sortOrder, &$isReversed) |
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{ |
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if ($closure === null) { |
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$isReversed = false; |
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return $sortOrder === SORT_DESC ? Functions::$compareStrictReversed : Functions::$compareStrict; |
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} |
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elseif (is_int($closure)) { |
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switch ($closure) { |
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case SORT_REGULAR: |
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return Functions::$compareStrict; |
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case SORT_NUMERIC: |
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$isReversed = false; |
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return $sortOrder === SORT_DESC ? Functions::$compareIntReversed : Functions::$compareInt; |
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case SORT_STRING: |
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return 'strcmp'; |
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case SORT_STRING | SORT_FLAG_CASE: |
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return 'strcasecmp'; |
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case SORT_LOCALE_STRING: |
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return 'strcoll'; |
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case SORT_NATURAL: |
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return 'strnatcmp'; |
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case SORT_NATURAL | SORT_FLAG_CASE: |
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return 'strnatcasecmp'; |
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default: |
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throw new \InvalidArgumentException("Unexpected sort flag: {$closure}."); |
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} |
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} |
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return self::createLambda($closure, 'a,b'); |
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} |
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/** |
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* Convert string lambda to SORT_ flags. Convert sortOrder from bool to SORT_ order. |
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* @param callable|string|int|null $closure |
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* @param int|bool $sortOrder |
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* @return callable|string|int|null |
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*/ |
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public static function lambdaToSortFlagsAndOrder($closure, &$sortOrder) |
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{ |
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if ($sortOrder !== SORT_ASC && $sortOrder !== SORT_DESC) |
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$sortOrder = $sortOrder ? SORT_DESC : SORT_ASC; |
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if (is_int($closure)) |
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return $closure; |
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elseif (($closure === null || is_string($closure)) && isset(self::$compareFunctionToSortFlags[$closure])) |
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return self::$compareFunctionToSortFlags[$closure]; |
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else |
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return null; |
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} |
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/** |
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* Convert string lambda to callable function. |
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* @param string $closure |
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* @param string $closureArgs |
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* @throws \InvalidArgumentException Incorrect lambda syntax. |
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* @return string|null |
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*/ |
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private static function createLambdaFromString(string $closure, string $closureArgs) |
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{ |
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$posDollar = strpos($closure, '$'); |
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if ($posDollar !== false) { |
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if (isset(self::$lambdaCache[$closure][$closureArgs])) |
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return self::$lambdaCache[$closure][$closureArgs]; |
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$posArrow = strpos($closure, '==>', $posDollar); |
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if ($posArrow !== false) { |
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$args = trim(substr($closure, 0, $posArrow), "() \r\n\t"); |
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$code = substr($closure, $posArrow + 3); |
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} |
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else { |
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$args = '$' . str_replace(',', '=null,$', $closureArgs) . '=null'; |
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$code = $closure; |
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} |
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$code = trim($code, " \r\n\t"); |
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if (strlen($code) > 0 && $code[0] != '{') |
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$code = "return {$code};"; |
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$fun = @create_function($args, $code); |
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// @codeCoverageIgnoreStart |
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if (!$fun) |
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throw new \InvalidArgumentException(self::ERROR_CANNOT_PARSE_LAMBDA); |
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// @codeCoverageIgnoreEnd |
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self::$lambdaCache[$closure][$closureArgs] = $fun; |
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return $fun; |
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} |
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return null; |
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} |
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} |
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Athari /
YaLinqo
