sroze / argument-resolver
A lightweight utility to resolve method arguments based on types and names
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Requires (Dev)
- doctrine/common: ~2.5
- fabpot/php-cs-fixer: ~1.8
- phpspec/phpspec: ~2.2
README
This lightweight library helps to automatically call a callable (function, method or closure) with a list of available arguments. The developer of the callable can then use type hinting and/or specific variable names to chose which arguments (s)he wants.
Installation
The suggested installation method is via composer:
composer require sroze/argument-resolver
Resolving arguments
The argument resolver can be created easily using the ArgumentResolverFactory
class:
use ArgumentResolver\ArgumentResolverFactory; $argumentResolver = ArgumentResolverFactory::create();
The resolveArguments
method returns an ordered array of resolved arguments for the given callable. The method's arguments
are:
- The callable
- The available arguments, as an array
Here's an example of how it can be used to have arguments of some closures based on a set of available arguments:
$closures = [ function(MyClass $object) { return $object instanceof MyClass; }, function($bar, array $list) { return count($list); } ]; foreach ($closures as $callable) { $arguments = $argumentResolver->resolveArguments($callable, [ 'classObject' => new MyClass(), 'bar' => 'foo', 'list' => ['an', 'array'] ]); // ... }
More than argument identification with type hinting, you can also use names:
class Foo { public function method($foo, $bar) { } } $argumentResolver->resolveArguments([new Foo(), 'method'], [ 'bar' => 1, 'foo' => 2, 'baz' => 3 ]); // Which returns: [2, 1]
To prevent possible conflicts, the library follow priorities and constraints described in the Rules chapter.
The callable runner
Because when you've resolved the needed arguments of a given callable it's often to call it, the library comes with a
CallableRunner
class that will do everything for you:
$runner = new CallableRunner($argumentResolver); $runner->run($callable, $availableArguments);
Instantiate an object
Sometimes, you would like to instantiate an object with a set of arguments. Here's the Instanciator
usage:
$instantiator = new Instantiator($argumentResolver); $instantiator->instantiate(YourClassName::class, $availableArguments);
Rules
Priorities
These are the resolution priorities for the arguments:
- Strict matching: Same name and same type
- Type matching
- Name matching
Constraints
The following constraints applies:
- If there's multiple arguments of the same type, then strict matching apply for this type
- Required arguments have to be resolved