Sphpeme\ExpHandler\LambdaExpHandler

Complexity

Total Complexity

3

Size/Duplication

Total Lines	20
Duplicated Lines	0 %

Importance

Changes

0

3 Methods

Rating	Name	Duplication	Size	Complexity
A	evaluate()	0	5	1
A	handles()	0	3	1
A	__construct()	0	3	1

<?php

namespace Sphpeme\ExpHandler;


use Sphpeme\Env;
use function Sphpeme\env_extend;

The function Sphpeme\env_extend was not found. Maybe you did not declare it correctly or list all dependencies?

use Sphpeme\Evaluator;
use Sphpeme\Symbol;

class LambdaExpHandler implements ExpHandler
{
    private $lambdaSymbol;

    public function __construct()
    {
        $this->lambdaSymbol = Symbol::make('lambda');
    }

    public function evaluate($exp, Env $env, Evaluator $evaluate)
    {
        [$lambda, $params, $body] = $exp;
        return function (...$args) use ($env, $body, $params, $evaluate) {
            return $evaluate($body, env_extend($env, array_combine($params, $args)));
        };
    }

    public function handles($exp): bool
    {
        return $exp[0] === $this->lambdaSymbol;
    }
}