PHP code example of byjg / statemachine

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

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

    

byjg / statemachine example snippets

$stA = new State("A");
$stB = new State("B");
$stC = new State("C");
$stD = new State("D");

$transitionA_B = new Transition($stA, $stB);
$transitionA_C = new Transition($stA, $stC);
$transitionB_D = new Transition($stB, $stD, function($data) {
    return !is_null($data);
});

$stateMachine = FiniteStateMachine::createMachine()
    ->addTransition($transitionA_B)
    ->addTransition($transitionA_C)
    ->addTransition($transitionB_D);

$stateMachine->canTransition($stA, $stB);  // returns true
$stateMachine->canTransition($stA, $stC);  // returns true
$stateMachine->canTransition($stA, $stD);  // returns false
$stateMachine->canTransition($stB, $stA);  // returns false
$stateMachine->canTransition($stB, $stD);  // returns false
$stateMachine->canTransition($stB, $stD, ["some_info"]); // returns true
$stateMachine->canTransition($stC, $stD); //returns false

$stateMachine->isInitial($stA); // returns true
$stateMachine->isInitial($stB); // returns false
$stateMachine->isFinal($stA); // returns false
$stateMachine->isFinal($stC); // returns true
$stateMachine->isFinal($stD); // returns true

$stateMachine = FiniteStateMachine::createMachine(
    [
        ['A', 'B'],
        ['A', 'C'],
        ['B', 'D', function($data) {
            return !is_null($data);
        }]
    ]
);

// States:
$stInitial = new State("__VOID__");
$stInStock = new State("IN_STOCK");
$stLastUnits = new State("LAST_UNITS");
$stOutOfStock = new State("OUT_OF_STOCK");

// Transitions:
$transitionInStock = Transition::create($stInitial, $stInStock, function ($data) {
    return $data["qty"] >= $data["min_stock"];
});

$transitionLastUnits = Transition::create($stInitial, $stLastUnits, function ($data) {
    return $data["qty"] > 0 && $data["qty"] < $data["min_stock"];
});

$transitionOutOfStock = Transition::create($stInitial, $stOutOfStock, function($data) {
    return $data["qty"] == 0;
});

// Create the Machine:
$stateMachine = FiniteStateMachine::createMachine()
    ->addTransition($transitionInStock)
    ->addTransition($transitionLastUnits)
    ->addTransition($transitionOutOfStock);

$stateMachine->autoTransitionFrom($stInitial, ["qty" => 10, "min_stock" => 20])); // returns LAST_UNITS
$stateMachine->autoTransitionFrom($stInitial, ["qty" => 30, "min_stock" => 20])); // returns IN_STOCK
$stateMachine->autoTransitionFrom($stInitial, ["qty" => 00, "min_stock" => 20])); // returns OUT_OF_STOCK

$stN = new State('SOMESTATE', function ($data) {
    // execute some operation with the data
})

// After run and return $stN object
// We can do this:

$resultState = $stateMachine->autoTransitionFrom('STATE', [...  data ...]));
$resultState->process(); // This will run the closure defined with the data used to validate it.

$transitions = Transition::createMultiple([$from1, $from2], $to, $condition);

$machine = FiniteStateMachine::createMachine()
    ->addTransitions($transitions);

$stateMachine->possibleTransitions($stA);

// Return null if doesn't exist, otherwise return the object State
$state = $stateMachine->state('OUT_OF_STOCK');