Nós, desenvolvedores de PHP, temos orgulho de escrever na linguagem OOP (você pode facilmente substituir o PHP aqui por C #, Java ou outra linguagem OOP). Cada vaga contém requisitos para conhecimento de OOP. Em cada entrevista, eles perguntam algo sobre SOLID ou as três baleias da OOP. Mas quando se trata disso - nós apenas temos aulas cheias de procedimentos. OOP é raro, geralmente em código de biblioteca.
Uma aplicação web típica são classes de entidade ORM que contêm dados de uma linha em um banco de dados e controladores (ou serviços - não importa) contendo procedimentos para trabalhar com esses dados. A Programação Orientada a Objetos se refere a objetos que possuem seus próprios dados e não os fornecem para processamento por outro código. Uma grande ilustração disso é uma pergunta que foi feita em um chat: "Como posso melhorar este código?"
private function getWorkingTimeIntervals(CarbonPeriod $businessDaysPeriod, array $timeRanges): array
{
$workingTimeIntervals = [];
foreach ($businessDaysPeriod as $date) {
foreach ($timeRanges as $time) {
$workingTimeIntervals[] = [
'start' => Carbon::create($date->format('Y-m-d') . ' ' . $time['start']),
'end' => Carbon::create($date->format('Y-m-d') . ' ' . $time['end'])
];
}
}
return $workingTimeIntervals;
}
/**
*
*
* @param array $workingTimeIntervals
* @param array $events
* @return array
*/
private function removeEventsFromWorkingTime(array $workingTimeIntervals, array $events): array
{
foreach ($workingTimeIntervals as $n => &$interval) {
foreach ($events as $event) {
$period = CarbonPeriod::create($interval['start'], $interval['end']);
if ($period->overlaps($event['start_date'], $event['end_date'])) {
if ($interval['start'] <= $event['start_date'] && $interval['end'] <= $event['end_date']) {
$interval['end'] = $event['start_date'];
} elseif ($interval['start'] >= $event['start_date'] && $interval['end'] >= $event['end_date']) {
$interval['start'] = $event['end_date'];
} elseif ($interval['start'] <= $event['start_date'] && $interval['end'] >= $event['end_date']) {
$interval['start'] = $event['start_date'];
$interval['end'] = $event['end_date'];
} else {
unset($workingTimeIntervals[$n]);
}
}
}
}
return $workingTimeIntervals;
}
. () (), . , . — ( ) , . , , . , , .
unit- . . ( ). .
class Interval
{
// PHP 7.4
public DateTimeImmutable $start;
public DateTimeImmutable $end;
}
DateTimeImmutable .
— .
, , , — .
unit-. . :
class Interval
{
public DateTimeImmutable $start;
public DateTimeImmutable $end;
public function __construct(DateTimeImmutable $start, DateTimeImmutable $end)
{
$this->start = $start;
$this->end = $end;
}
}
PHPUnit- :
use App\Interval;
use PHPUnit\Framework\TestCase;
class IntervalTest extends TestCase
{
private DateTimeImmutable $today;
private DateTimeImmutable $yesterday;
private DateTimeImmutable $tomorrow;
protected function setUp(): void
{
$this->today = new DateTimeImmutable();
$this->yesterday = $this->today->add(\DateInterval::createFromDateString("-1 day"));
$this->tomorrow = $this->today->add(\DateInterval::createFromDateString("1 day"));
parent::setUp();
}
public function testValidDates()
{
$interval = new Interval($this->yesterday, $this->today);
$this->assertEquals($this->yesterday, $interval->start);
$this->assertEquals($this->today, $interval->end);
}
public function testInvalidDates()
{
$this->expectException(\InvalidArgumentException::class);
new Interval($this->today, $this->yesterday);
}
}
, . , testValidDates
, . , testInvalidDates
, . , :
Failed asserting that exception of type "InvalidArgumentException" is thrown.
:
class Interval
{
public DateTimeImmutable $start;
public DateTimeImmutable $end;
public function __construct(DateTimeImmutable $start, DateTimeImmutable $end)
{
if ($start > $end) {
throw new \InvalidArgumentException("Invalid date interval");
}
$this->start = $start;
$this->end = $end;
}
}
. PHP, null . . , , . Interval . ? unit- . , . . , , isEmpty
.
class Interval
{
public DateTimeImmutable $start;
public DateTimeImmutable $end;
public function __construct(DateTimeImmutable $start, DateTimeImmutable $end)
{
if ($start > $end) {
throw new \InvalidArgumentException("Invalid date interval");
}
$this->start = $start;
$this->end = $end;
}
public function isEmpty(): bool
{
return $this->start->getTimestamp() == $this->end->getTimestamp();
}
}
class IntervalTest extends TestCase
{
//...
public function testNonEmpty()
{
$interval = new Interval($this->yesterday, $this->today);
$this->assertFalse($interval->isEmpty());
}
public function testEmpty()
{
$interval = new Interval($this->today, $this->today);
$this->assertTrue($interval->isEmpty());
}
}
. ['start'=>,'end'=>]
, . ! , . , :
- 08:00 - 12:00
- 13:00 - 17:00
08:00 - 12:00
13:00 - 17:00
...
, :
:
- 08:00 - 09:00
- 16:00 - 17:00
13:00 - 17:00
:
- 09:00 - 12:00
- 13:00 - 16:00
08:00 - 12:00
...
Interval:
$period = CarbonPeriod::create($interval['start'], $interval['end']);
if ($period->overlaps($event['start_date'], $event['end_date'])) {
if ($interval['start'] <= $event['start_date'] && $interval['end'] <= $event['end_date']) {
$interval['end'] = $event['start_date'];
} elseif ($interval['start'] >= $event['start_date'] && $interval['end'] >= $event['end_date']) {
$interval['start'] = $event['end_date'];
} elseif ($interval['start'] <= $event['start_date'] && $interval['end'] >= $event['end_date']) {
$interval['start'] = $event['start_date'];
$interval['end'] = $event['end_date'];
} else {
unset($workingTimeIntervals[$n]);
}
}
Interval: remove(Interval $other)
, . :
private function removeEventsFromWorkingTime($workingTimeIntervals, $events): array
{
foreach ($workingTimeIntervals as $n => $interval) {
foreach ($events as $event) {
$interval->remove($event);
if ($interval->isEmpty()) {
unset($workingTimeIntervals[$n]);
}
}
}
return $workingTimeIntervals;
}
. . , , ! , . . , .
, $other
.
class IntervalRemoveTest extends TestCase
{
private DateTimeImmutable $minus10Days;
private DateTimeImmutable $today;
private DateTimeImmutable $yesterday;
private DateTimeImmutable $tomorrow;
private DateTimeImmutable $plus10Days;
protected function setUp(): void
{
$this->today = new DateTimeImmutable();
$this->yesterday = $this->today->sub(\DateInterval::createFromDateString("1 day"));
$this->tomorrow = $this->today->add(\DateInterval::createFromDateString("1 day"));
$this->minus10Days = $this->today->sub(\DateInterval::createFromDateString("10 day"));
$this->plus10Days = $this->today->add(\DateInterval::createFromDateString("10 day"));
parent::setUp();
}
public function testDifferent()
{
$interval = new Interval($this->minus10Days, $this->yesterday);
$interval->remove(new Interval($this->tomorrow, $this->plus10Days));
$this->assertEquals($this->minus10Days, $interval->start);
$this->assertEquals($this->yesterday, $interval->end);
}
}
, , .
class IntervalRemoveTest extends TestCase
{
public function testFullyCovered()
{
$interval = new Interval($this->yesterday, $this->tomorrow);
$interval->remove(new Interval($this->minus10Days, $this->plus10Days));
$this->assertTrue($interval->isEmpty());
}
public function testFullyCoveredWithCommonStart()
{
$interval = new Interval($this->yesterday, $this->tomorrow);
$interval->remove(new Interval($this->yesterday, $this->plus10Days));
$this->assertTrue($interval->isEmpty());
}
// and testFullyCoveredWithCommonEnd()
}
, :
?
?! ! remove
! , :
} elseif ($interval['start'] <= $event['start_date'] && $interval['end'] >= $event['end_date']) {
$interval['start'] = $event['start_date'];
$interval['end'] = $event['end_date'];
.
, . , , . . , . , , . , , , . , , ! . .
— IntervalCollection, :
class Interval
{
public DateTimeImmutable $start;
public DateTimeImmutable $end;
public function __construct(DateTimeImmutable $start,
DateTimeImmutable $end)
{
if ($start > $end) {
throw new \InvalidArgumentException(
"Invalid date interval");
}
$this->start = $start;
$this->end = $end;
}
public function isEmpty(): bool
{
return $this->start === $this->end;
}
/**
* @param Interval $other
* @return Interval[]
*/
public function remove(Interval $other)
{
if ($this->start >= $other->end
|| $this->end <= $other->start) return [$this];
if ($this->start >= $other->start
&& $this->end <= $other->end) return [];
if ($this->start < $other->start
&& $this->end > $other->end) return [
new Interval($this->start, $other->start),
new Interval($other->end, $this->end),
];
if ($this->start === $other->start) {
return [new Interval($other->end, $this->end)];
}
return [new Interval($this->start, $other->start)];
}
}
/** @mixin Interval[] */
class IntervalCollection extends \ArrayIterator
{
public function diff(IntervalCollection $other)
: IntervalCollection
{
/** @var Interval[] $items */
$items = $this->getArrayCopy();
foreach ($other as $interval) {
$newItems = [];
foreach ($items as $ourInterval) {
array_push($newItems,
...$ourInterval->remove($interval));
}
$items = $newItems;
}
return new self($items);
}
}
IntervalCollection — , . Interval, , .
— https://github.com/adelf/intervals-example. , IntervalCollection::diff
. , . . unit-.
, - coupling ( ), . private:
class Interval
{
private DateTimeImmutable $start;
private DateTimeImmutable $end;
// methods
}
Isso pode ser feito adicionando métodos de estilo print()
que nos ajudarão a extrair os dados de intervalo no formato desejado, mas fecharão completamente a capacidade de trabalhar com os dados de intervalo de fora. Mas este é definitivamente um assunto para outro artigo.