動的にクラスを定義する何か

ClassBuilder.php

<?php
/**
 * ClassBuilder::startBuild("Person")
 * 	->addProperty("protected", "name")
 * 	->addProperty("protected", "age")
 * 	->addProperty("protected", "gender")
 * 	->addMethod("public", '__construct($name, $age, $gender)',
 * 		  '$this->name   = $name;'
 * 		. '$this->age    = $age;'
 * 		. '$this->gender = $gender;'
 * 	)
 * 	->addMethod("public", 'getName()',
 * 		'return $this->name;'
 * 	)
 * 	->addMethod("public", 'getAge()',
 * 		'return $this->age;'
 * 	)
 * 	->addMethod("public", 'getGender()',
 * 		'return $this->gender;'
 * 	)
 * 	->addMethod("public", "__toString()",
 * 		'return sprintf("[name : %s, age : %s, gender : %s]", $this->name, $this->age, $this->gender);'
 * 	)
 * 	->build();
 * 
 * ClassBuilder::startBuild("Man")->extend("Person")
 * 	->addMethod("public", '__construct($name, $age)',
 * 		  'parent::__construct($name, $age, "Male");'
 * 	)
 * 	->build();
 * 
 * ClassBuilder::startBuild("Woman")->extend("Person")
 * 	->addMethod("public", '__construct($name, $age)',
 * 		  'parent::__construct($name, $age, "Female");'
 * 	)
 * 	->build();
 * 
 * $person = new Person("person", 20, "unknown");
 * $man    = new Man("man", 21);
 * $woman  = new Woman("woman", 22);
 * 
 * echo $person . "\r\n";
 * echo $man    . "\r\n";
 * echo $woman  . "\r\n";
 */
class ClassBuilder {
	
	private $className;
	
	private $superClass;
	
	private $interface;
	
	private $properties = array();
	
	private $metods = array();
	
	public static function startBuild($className){
		return new self($className);
	}
	
	private function __construct($className){
		$this->className = $className;
	}
	
	public function extend($superClass){
		$this->superClass = $superClass;
		return $this;
	}
	
	public function implement($interface){
		$this->interface = $interface;
		return $this;
	}
	
	
	public function addProperty($scope, $name){
		$this->properties[] = array(
			"scope" => $scope,
			"name"  => $name,
		);
		
		return $this;
	}
	
	public function addMethod($scope, $signature, $contents){
		$this->methods[] = array(
			"scope"     => $scope,
			"signature" => $signature,
			"contents"  => $contents,
		);
		
		return $this;
	}
	
	public function toString(){
		
		$className  = $this->className;
		$superClass = empty($this->superClass) ? "" : " extends {$this->superClass}";
		$interface  = empty($this->interface)  ? "" : " implements {$this->interface}";

		$properties = array();
		foreach($this->properties as $property){
			
			$scope = empty($method["scope"]) ? "" : $property["scope"];
			$name  = empty($method["name"])  ? "" : $property["name"] . ";";
						
			$properties[] = sprintf("%s %s", $scope, $name);
		}
		
		$methods = array();
		foreach($this->methods as $method){
			
			$scope     = empty($method["scope"])     ? "" : $method["scope"];
			$signature = empty($method["signature"]) ? "" : $method["signature"];
			$contents  = empty($method["contents"])  ? "" : $method["contents"];
			
			$methods[] = sprintf(
				"%s function %s {" .
				"%s" .
				"}"
				,$scope, $signature, $contents
			);
		}
		
		$class = sprintf(
			"class %s%s%s {"
			. "%s"
			. "%s"
			. "}"
			, $className, $superClass, $interface, implode(" ", $properties), implode(" ", $methods)
		);

		return $class;
	}
	
	public function build(){
		eval( $this->toString() );
	}
}