77 lines
2.1 KiB
PHP
77 lines
2.1 KiB
PHP
<?php
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namespace Misuzu;
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final class Pagination {
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private const INVALID_OFFSET = -1;
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private const START_PAGE = 1;
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public const DEFAULT_PARAM = 'p';
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private int $count = 0;
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private int $range = 0;
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private int $offset = 0;
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public function __construct(int $count, int $range = -1, ?string $readParam = self::DEFAULT_PARAM) {
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$this->count = max(0, $count);
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$this->range = $range < 0 ? $count : $range;
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if(!empty($readParam))
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$this->readPage($readParam);
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}
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public function getCount(): int {
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return $this->count;
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}
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public function getRange(): int {
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return $this->range;
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}
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public function getPages(): int {
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return (int)ceil($this->getCount() / $this->getRange());
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}
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public function hasValidOffset(): bool {
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return $this->offset !== self::INVALID_OFFSET;
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}
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public function getOffset(): int {
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return $this->hasValidOffset() ? $this->offset : 0;
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}
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public function setOffset(int $offset): self {
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if($offset < 0)
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$offset = self::INVALID_OFFSET;
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$this->offset = $offset;
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return $this;
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}
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public function getPage(): int {
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if($this->getOffset() < 1)
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return self::START_PAGE;
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return (int)floor($this->getOffset() / $this->getRange()) + self::START_PAGE;
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}
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public function setPage(int $page, bool $zeroBased = false): self {
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if(!$zeroBased)
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$page -= self::START_PAGE;
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$this->setOffset($this->getRange() * $page);
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return $this;
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}
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public function readPage(string $name = self::DEFAULT_PARAM, int $default = self::START_PAGE, ?array $source = null): self {
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$this->setPage(self::param($name, $default, $source));
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return $this;
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}
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public static function param(string $name = self::DEFAULT_PARAM, int $default = self::START_PAGE, ?array $source = null): int {
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$source ??= $_GET;
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if(isset($source[$name]) && is_string($source[$name]) && ctype_digit($source[$name]))
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return (int)$source[$name];
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return $default;
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}
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}
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