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<?php |
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/** |
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* Subclass factory |
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* |
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* @package Stencil |
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*/ |
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/** |
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* Class SubclassFactory |
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*/ |
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class Stencil_Subclass_Factory { |
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const CLASS_FORMAT = '%s_%s'; |
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/** |
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* Create Null object |
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* |
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* @param string $prefix Prefix for the Class to use (directory). |
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* |
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* @return mixed |
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* @throws InvalidArgumentException When something else but a non-empty string is passed. |
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*/ |
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public static function create_null( $prefix ) { |
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if ( ! is_string( $prefix ) || empty( $prefix ) ) { |
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throw new InvalidArgumentException( 'Expected a non-empty string.' ); |
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} |
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$class = sprintf( self::CLASS_FORMAT, $prefix, 'Null' ); |
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return new $class; |
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} |
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/** |
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* Create a new class if it exists |
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* |
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* @param string $class Class name. |
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* @param string $prefix Prefix of the class (directory). |
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* |
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* @return null |
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* @throws InvalidArgumentException For invalid class or prefix parameters. |
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*/ |
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public static function create_if_exists( $class, $prefix ) { |
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if ( ! is_string( $class ) || empty( $class ) ) { |
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throw new InvalidArgumentException( 'Expected non-empty string for $class.' ); |
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} |
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if ( ! is_string( $prefix ) || empty( $prefix ) ) { |
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throw new InvalidArgumentException( 'Expected non-empty string for $prefix.' ); |
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} |
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$class = self::format_class_name( $class ); |
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$class = sprintf( self::CLASS_FORMAT, $prefix, $class ); |
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if ( class_exists( $class ) ) { |
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return new $class; |
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} |
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return null; |
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} |
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/** |
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* Create new class or Null object if it does not exist |
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* |
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* @param string $class Name of the class. |
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* @param string $prefix Prefix of the class. |
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* |
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* @return null |
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*/ |
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public static function create_or_null( $class, $prefix ) { |
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$result = self::create_if_exists( $class, $prefix ); |
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if ( is_null( $result ) ) { |
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$result = self::create_null( $prefix ); |
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} |
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return $result; |
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} |
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/** |
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* Uniform class name |
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* |
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* Class format: UpperCaseWords |
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* |
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* @param string $source Class name to format. |
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* |
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* @return string |
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*/ |
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private static function format_class_name( $source ) { |
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$class = strtolower( $source ); |
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$class = preg_replace( '~[^a-z]~', '_', $class ); |
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// Replace spaces with uppercase next character. |
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if ( false !== strpos( $class, ' ' ) ) { |
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/** |
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* Using callback via class because Anonymous functions are not guaranteed to be present |
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* |
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* @see: http://php.net/manual/en/functions.anonymous.php |
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* 5.3.0 Anonymous functions become available. |
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*/ |
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$class = preg_replace_callback( |
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'~_[a-z]~', |
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array( __CLASS__, 'camel_case_callback' ), |
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$class |
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); |
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$class = trim( $class ); |
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} |
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$class = ucfirst( $class ); |
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return $class; |
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} |
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/** |
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* Replace ' {alphanum}' with uppercase of alphanum |
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* |
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* Example: 'stencil example' => 'stencilExample' |
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* |
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* @param array $matches Matched items in string. |
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* |
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* @return string |
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*/ |
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private function camel_case_callback( $matches ) { |
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return '_' . trim( strtoupper( $matches[0] ) ); |
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} |
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} |
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moorscode /
stencil
