设计模式——解释器模式

说明

示例

下面看下解释器模式的代码实现

interface Expression{
    public function interpret(Context $context): int;
}

class Plus implements Expression{
    public function interpret(Context $context): int{
        return $context->getNum1() + $context->getNum2();
    }
}

class Minus implements Expression{
    public function interpret(Context $context): int{
        return $context->getNum1() - $context->getNum2();
    }
}

class Context{
    private int $num1,$num2;

    public function __construct(int $num1,int $num2){
        $this->num1 = $num1;
        $this->num2 = $num2;
    }

    public function getNum1(): int{
        return $this->num1;
    }

    public function setNum1(int $num1){
        $this->num1 = $num1;
    }

    public function getNum2(): int{
        return $this->num2;
    }

    public function setNum2(int $num2){
        $this->num2 = $num2;
    }
}


// 调用
$result = (new Minus())->interpret(new Context((new Plus())->interpret(new Context(9,2)),8));
echo $result;
// output: 3

总结