Evaluator

A Laravel package and Orchestra extension for symfony/expression-language component.

Installation

Simpy update the composer.json file and run composer install.

"require": {
	"elepunk/evaluator": "1.0.*"
}

Quick Installation

composer require "elepunk/evaluator=1.0.*"

Setup

If you are using Orchestra Platform, you can simply enable the extension or add the service provider. This will also load the Evaluator alias automatically.

'providers' => [
	'Elepunk\Evaluator\EvaluatorServiceProvider'
];

Adapter

This package provide Orchesta Memory as the default driver.

How To Use

Evaluating an expression

$test = [
    'foo' => 10,
    'bar' => 5
];

echo Evaluator::evaluate('foo > bar', $test); //this will return true

You can also save the expression rule.

$test = [
    'foo' => 10,
    'bar' => 5
];

Evaluator::expression()->add('test', 'foo > bar');

echo Evaluator::evaluateRule('test', $test); //this will return true

For supported expressions, visit the Symfony Expression Language Component.

Condition

Let say we want to implement 10% tax to our collection.

$item = [
    'price' => 100
];

$condition = [
    'target' => 'price',
    'action' => '10%',
    'rule' => 'price > 50'
];

Evaluator::expression()->add('tax', $condition);

$calculated = Evaluator::condition('tax', $item);

Item with multiplier.

$item = [
	'price' => 50,
	'quantity' => 2
];

$condition = [
    'target' => 'price',
    'action' => '10%',
    'rule' => 'price > 50',
    'multiplier' => 'quantity'
];

Evaluator::expression()->add('tax', $condition);

$calculated = Evaluator::condition('tax', $item);