PHP code example of xakepehok / expression-executor

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

xakepehok / expression-executor example snippets

class MinFunction implements \XAKEPEHOK\ExpressionExecutor\FunctionInterface 
{

    public function getName(): string
    {
        return 'MIN';
    }

    public function execute(array $arguments, array $context)
    {
        return min($arguments);
    }
}

class NumberOfDayFunction implements \XAKEPEHOK\ExpressionExecutor\FunctionInterface 
{

    public function getName(): string
    {
        return 'NUMBER_OF_DAY';
    }

    public function execute(array $arguments, array $context)
    {
        $year = $arguments['year'] ?? ($arguments[0] ?? null);
        $month = $arguments['month'] ?? ($arguments[1] ?? null);
        $day = $arguments['day'] ?? ($arguments[2] ?? null);
        
        if ($year === null || $month === null || $day === null) {
            throw new \XAKEPEHOK\ExpressionExecutor\Exceptions\FunctionException('Arguments error');
        }
        
        return date('N', strtotime("{$year}-{$month}-{$day}"));
    }
}

class PlusOperator implements \XAKEPEHOK\ExpressionExecutor\OperatorInterface 
{
    
    public function operator() : string
    {
        return '+';    
    }
    
    /**
    * Custom integer priority value. For example, for "+" it can be 1, for "*" it can be 2
    * @return int
    */
    public function priority() : int
    {
        return 1;
    }
    
    public function execute($leftOperand, $rightOperand, array $context)
    {
        return $leftOperand + $rightOperand;
    }    
}

class MultiplyOperator implements \XAKEPEHOK\ExpressionExecutor\OperatorInterface 
{
    
    public function operator() : string
    {
        return '*';    
    }
    
    /**
    * Custom integer priority value. For example, for "+" it can be 1, for "*" it can be 2
    * @return int
    */
    public function priority() : int
    {
        return 2;
    }
    
    public function execute($leftOperand, $rightOperand, array $context)
    {
        return $leftOperand * $rightOperand;
    }    
}

class InOperator implements \XAKEPEHOK\ExpressionExecutor\OperatorInterface 
{
    
    public function operator() : string
    {
        return 'IN';    
    }
    
    /**
    * Custom integer priority value. For example, for "+" it can be 1, for "*" it can be 2
    * @return int
    */
    public function priority() : int
    {
        return 1;
    }
    
    public function execute($leftOperand, $rightOperand, array $context)
    {
        return in_array($leftOperand, $rightOperand, true);
    }    
}

class AndOperator implements \XAKEPEHOK\ExpressionExecutor\OperatorInterface 
{
    
    public function operator() : string
    {
        return '&&';    
    }
    
    /**
    * Custom integer priority value. For example, for "+" it can be 1, for "*" it can be 2
    * @return int
    */
    public function priority() : int
    {
        return 1;
    }
    
    public function execute($leftOperand, $rightOperand, array $context)
    {
        return $leftOperand && $rightOperand;
    }    
}

$executor = new \XAKEPEHOK\ExpressionExecutor\Executor(
    [new MinFunction(), new NumberOfDayFunction()],
    [new PlusOperator(), new MultiplyOperator(), new InOperator(), new AndOperator()],
    function ($name, array $context) {
        $vars = [
            'VARIABLE' => 10,
            'CONTEXT.VALUE' => $context['value'],
        ];
        return $vars[$name];
    },
    ['PI' => 3.14]
);

//And simply execute our expression 
$result_1 = $executor->execute('MIN(5, 10.5) + NUMBER_OF_DAY(year: "2019", month: "01", day: "20") + PI * {{VARIABLE}} + ((-2) + 2.5) * 2');

$result_2 = $executor->execute('("HELLO" IN ["HELLO", "WORLD"]) && (10 IN [2+2, 3+3, 5+5, "string here"])');