arete/collection-pipeline

PHP (partial) implementation of a pipeline collection. Work with a collection of objects without making a bunch of callables, loops, & ifs.

dev-master / 0.2.5.x-dev 2015-10-27 02:44 UTC

README

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Work with a collection of objects without making a bunch of callables, loops, & ifs.

After reading Martin Fowler on the Collection Pipeline I wanted to use something similar in PHP, thus, this was born. League\Pipeline was used as was Illuminate\Support\Collection (all functions from this Collection are available in the chain.)

Example

This is our example group we will use

use Arete\CollectionPipeline\CollectionPipeline as CP;

class MockEntity {
    public $id;
    public $name;
    public function __construct($id, $name) {
        $this->id = $id;
        $this->name = $name;
    }
    public function getId() {
        return $this->id;
    }
    public function getName() {
        return $this->name;
    }
}

// ids are just random for testing
$array = array(
    new MockEntity(null, "eric"), #0
    new MockEntity(10, "tim"),    #1
    new MockEntity(111, "beau"),  #2
    new MockEntity(11, "ross"),   #3
    new MockEntity(12, "sarah"),  #4
    new MockEntity(13, "taylor"), #5
    new MockEntity(-42, "lea"),   #6
    new MockEntity("eh", "phil"), #7
    new MockEntity(6, "larry"),   #8
    new MockEntity(10, "frank"),  #9
    new MockEntity(["eh"], "joe"),#10

    new MockEntity(99, "kayla"),  #12
    new MockEntity(0, "martin"),  #11
    new MockEntity(1, "brad"),    #13
    new MockEntity(2, "luke"),    #14
    new MockEntity(3, "paul"),    #15
    new MockEntity(4, "ash"),     #16
    new MockEntity(5, "davey"),   #17
    new MockEntity(18,"anthony"), #18
    new MockEntity(19,"tim"),     #19
);

String functions

$result = CP::from($array)->wheres('getId', 'is_string')->all();

# gives: [7 => $array[7]]

! String functions

$result = CP::from($array)->wheres('getId', '!is_string')->all();

# gives: everything in $array except #7

Each

Use ::wheresEach to compare the whole value without using any accessors.

instanceof

$result = CP::from($array)->wheres('instanceof', MockEntity::CLASS)->all();

# gives: everything in $array

! instanceof

$result = CP::from($array)->wheres('!instanceof', MockEntity::CLASS)->all();

# gives: empty array, they all are instances of MockEntity

comparison operators

comparison operator tests

$result = CP::from($array)->wheres('getId', '>', 110)->all();

# gives: [9 => $array[9]]

chaining

$result = CP::from($array)->wheres('getId', '!is_string')->wheres('getId', '>', 10)->wheres('getName', '===', 'tim')->all();

# gives: [19 => $array[19]]

argument order:

The accessor return value (X) as the first argument, and the value you are using in the comparison (Y).

// one does contain joe, but none contain derek
$stringItWouldBeIn = 'joe,derek';
$x = 'getName';
$y = $stringItWouldBeIn;

// containsSubString is from arete\support
$result = CP::from($array)->wheresYX($x, 'containsSubString', $y)->all();

# gives: [10 => $array[10]]

Laravel Illuminate:

Since it extends Illuminate\Support\Collection, you can use their functions, such as:

$result = CP::from($array)->wheres('id', 'is_string', null, 'property')->keys();

# gives: [7]

Types:

// will only check for the method `getId`
$result = CP::from($array)->wheres('getId', '>', 110, 'method')->all();

# gives: [9 => $array[9]]

Reverse order

// compares 110 < $payload->getId()
$result = CP::from($array)->wheres('getId', '<', 110, 'method', 'yx')->all();

# gives: [9 => $array[9]]

callables

$stringItWouldBeIn = 'joe,jonathon';
$result = CP::from($array)->wheresYX('getName', 'containsSubString', $stringItWouldBeIn, 'callable')->all();
$result = CP::from($array)->wheres('getId', function($value) {
    if ($value == 'tim')
        return true
    return false;
})->all();

# gives: [10 => $array[10]]

Value:

Value is an optional parameter, so if you want to check say, a property only, but have no value to compare it to:

// will only check for the property `id`,
// it could be ['property', 'method'] if you wanted to use a method if the property was not there
// or it could be ['property', 'method', 'callable'] (which is default)
$result = CP::from($array)->wheres('id', 'is_string', null, 'property')->all();

# gives: [9 => $array[9]]

Specification

arete/specification


use Arete\Specification\Specification;
use Arete\Specification\SpecificationTrait;

class NameEquals implements Specification {
    use ParameterizedSpecification;
    use SpecificationTrait;

    public function isSatisfiedBy($entity) {
        if ($entity->getName() == $this->value)
            return true;
        return false;
    }
}

$result = CP::from($array)->satisfying(new NameEquals('tim'));

# gives: [10 => $array[10]]

Installation

It can be installed from Packagist using Composer.

In your project root just run:

$ composer require arete/collection-pipeline

Make sure that you’ve set up your project to autoload Composer-installed packages.

Running tests

Run via the command line by going to arete/collection-pipeline directory and running phpunit

@TODO:

  • add ability to get an array with objects method values. Meaning, if I want to just get $objects->getName(); as an array of $objectNames and also maybe set what the key is?
  • option to pass in an array with the '!' if you want it to be not?
  • move ExpressionBuilder to Constructor()
  • optimize the filters so they can be combined and done in one loop when requested as array / all()?
  • pass in multiple string functions & comparison operators, such as 'is_string | is_int & >' be able to do ('methodName', 'strlen >', 5) (could use some Symfony\ExpressionLanguage optionally if alias are required) when this is done, it will really use the pipeline how it ought to
  • similar to the last todo, but with chaining method calls
  • move examples out of readme (except for 1), and into [examples/]
  • add in spaceship comparison operator depending on version (thanks @seldaek)
  • ands using last method?
  • refactor ExendedPipeline so it is less of a God object.
  • array key in Specification
  • array key for matching along with the method, property, and callable
  • abstract argsOrderYX & XY
  • remove null check from ::wheresComparison
  • add ability to reverse arguments in expressions
  • add casting of accessor
  • add ::reduce() similar implementation as ::map()