QueryPHP双向链表 ¶
Testing Is Documentation
在 PHP 双向链表的基础上加上数据类型验证功能，不少业务场景中保证链表中数据一致性。
阻止链表返回空数据时抛出异常的默认行为。
底层基于 spldoublylinkedlist 开发，相关文档 http://php.net/manual/zh/class.spldoublylinkedlist.php。
Uses
php
<?php
use Leevel\Support\LinkedList;
链表基本使用方法 ¶
php
public function testBaseUse(): void
{
$linkedList = new LinkedList();
static::assertSame(0, $linkedList->count());
static::assertNull($linkedList->pop());
static::assertNull($linkedList->pop());
}
push 链表尾部弹出元素 ¶
php
public function testPush(): void
{
$linkedList = new LinkedList();
$linkedList->push(5);
$linkedList->push(6);
static::assertSame(2, $linkedList->count());
static::assertSame(6, $linkedList->pop());
static::assertSame(5, $linkedList->pop());
static::assertSame(0, $linkedList->count());
}
unshift 链表头插入元素 ¶
php
public function testUnshift(): void
{
$linkedList = new LinkedList();
$linkedList->unshift(5);
$linkedList->unshift(6);
static::assertSame(2, $linkedList->count());
static::assertSame(5, $linkedList->pop());
static::assertSame(6, $linkedList->pop());
static::assertSame(0, $linkedList->count());
}
add 链表指定位置插入新值 ¶
php
public function testAdd(): void
{
$linkedList = new LinkedList();
$linkedList->add(0, 'hello');
$linkedList->add(1, 'world');
$linkedList->add(2, 'foo');
$linkedList->add(3, 'bar');
static::assertSame('hello', $linkedList->offsetGet(0));
static::assertSame('world', $linkedList->offsetGet(1));
static::assertSame('foo', $linkedList->offsetGet(2));
static::assertSame('bar', $linkedList->offsetGet(3));
}
offsetSet 更新链表指定位置链表的值 ¶
php
public function testOffsetSet(): void
{
$linkedList = new LinkedList();
$linkedList->add(0, 'hello');
$linkedList->add(1, 'world');
$linkedList->add(2, 'foo');
$linkedList->add(3, 'bar');
$linkedList->offsetSet(0, 'hello2');
$linkedList->offsetSet(1, 'world2');
$linkedList->offsetSet(2, 'foo2');
$linkedList->offsetSet(3, 'bar2');
static::assertSame('hello2', $linkedList->offsetGet(0));
static::assertSame('world2', $linkedList->offsetGet(1));
static::assertSame('foo2', $linkedList->offsetGet(2));
static::assertSame('bar2', $linkedList->offsetGet(3));
}
链表支持元素类型限定 ¶
php
public function testValidateType(): void
{
$this->expectException(\UnexpectedValueException::class);
$this->expectExceptionMessage('The element type must be one of the following `string`.');
$linkedList = new LinkedList(['string']);
$linkedList->push(5);
}