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142 lines (116 loc) · 3.75 KB
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<?php
declare(strict_types=1);
namespace BusFactor\JsonPointer;
use InvalidArgumentException;
use JsonException;
use function array_map;
use function array_slice;
use function array_values;
use function count;
use function explode;
use function gettype;
use function implode;
use function is_object;
use function is_string;
use function json_decode;
use function json_encode;
use function preg_match;
use function str_replace;
use function trim;
use const JSON_THROW_ON_ERROR;
abstract class AbstractPointer implements PointerInterface
{
/**
* @var array<int|string>
*/
private array $referenceTokens;
/**
* @param array<string|int> $referenceTokens
*
* @throws InvalidArgumentException
*/
public function __construct(array $referenceTokens = [])
{
$this->setReferenceTokens($referenceTokens);
}
/**
* @return array<string|int>
*/
public function getReferenceTokens(): array
{
return $this->referenceTokens;
}
public function toJson(): string
{
return count($this->referenceTokens) > 0
? '/' . implode('/', array_map(self::encodeReferenceToken(...), $this->referenceTokens))
: '';
}
/**
* @throws InvalidArgumentException
*/
public static function fromJson(string $json): static
{
if (preg_match('~^(/([^/])*)*$~', $json) !== 1) {
throw new InvalidArgumentException('invalid JSON pointer format: ' . $json);
}
return new static(array_map(self::decodeReferenceToken(...), array_slice(explode('/', $json), 1)));
}
/**
* @param array<string|int> $referenceTokens
*
* @throws InvalidArgumentException
*/
protected function setReferenceTokens(array $referenceTokens): static
{
foreach ($referenceTokens as $referenceToken) {
$type = gettype($referenceToken);
if ($type !== 'string' && $type !== 'integer') {
throw new InvalidArgumentException('reference token must be <string> or <int>, got <' . $type . '>');
}
}
$this->referenceTokens = array_values($referenceTokens);
return $this;
}
/**
* @throws JsonException
*
* @todo find a better way to UTF-8 encode the reference token
*/
protected static function encodeReferenceToken(string|int $referenceToken): string|int
{
if (! is_string($referenceToken)) {
return $referenceToken;
}
$value = json_encode(str_replace(['~', '/'], ['~0', '~1'], $referenceToken), flags: JSON_THROW_ON_ERROR);
if (! is_string($value)) {
throw new InvalidArgumentException('failed to encode JSON pointer reference token');
}
return trim($value, '"');
}
/**
* @throws JsonException
* @throws InvalidArgumentException
*
* @todo find a better way to UTF-8 decode the reference token
*/
protected static function decodeReferenceToken(string|int $referenceToken): string|int
{
if (! is_string($referenceToken)) {
return $referenceToken;
}
$referenceToken = str_replace(['~1', '~0'], ['/', '~'], $referenceToken);
if (! is_string($referenceToken)) {
throw new InvalidArgumentException('failed to decode JSON pointer reference token (1)');
}
$result = json_decode('{"value":"' . $referenceToken . '"}', flags: JSON_THROW_ON_ERROR);
if (! is_object($result) || ! isset($result->value) || ! is_string($result->value)) {
throw new InvalidArgumentException('failed to decode JSON pointer reference token (2)');
}
return $result->value;
}
public function __toString(): string
{
return $this->toJson();
}
}