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<?php declare(strict_types=1); |
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namespace DaveRandom\Jom; |
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use DaveRandom\Jom\Exceptions\InvalidPointerException; |
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final class Pointer |
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{ |
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private $path = []; |
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private $relativeLevels = null; |
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private $keyLookup = false; |
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private $string; |
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/** |
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* @throws InvalidPointerException |
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*/ |
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private static function decodePath(string $path): array |
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{ |
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if ($path === '') { |
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return []; |
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} |
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if ($path[0] !== '/') { |
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throw new InvalidPointerException('JSON pointer path must be the empty string or begin with /'); |
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} |
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$result = []; |
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foreach (\explode('/', \substr($path, 1)) as $component) { |
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$result[] = \str_replace(['~1', '~0'], ['/', '~'], $component); |
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} |
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return $result; |
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} |
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private static function encodePath(array $path): string |
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{ |
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$result = ''; |
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foreach ($path as $component) { |
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$result .= '/' . \str_replace(['~', '/'], ['~0', '~1'], $component); |
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} |
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return $result; |
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} |
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private static function splitRelativePointerComponents(string $pointer): array |
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{ |
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return \preg_match('/^(0|[1-9][0-9]*)($|[^0-9].*)/i', $pointer, $match) |
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? [$match[2], (int)$match[1]] |
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: [$pointer, null]; |
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} |
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/** |
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* @throws InvalidPointerException |
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*/ |
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private static function validateRelativePointerParams(?int $relativeLevels, ?bool $isKeyLookup): void |
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{ |
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if ($relativeLevels < 0) { |
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throw new InvalidPointerException('Relative levels must be positive'); |
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} |
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if ($isKeyLookup && $relativeLevels === null) { |
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throw new InvalidPointerException('Key lookups are only valid for relative pointers'); |
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} |
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} |
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private function __construct() { } |
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/** |
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* @throws InvalidPointerException |
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*/ |
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public static function createFromString(string $pointer): self |
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{ |
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$result = new self(); |
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[$path, $result->relativeLevels] = self::splitRelativePointerComponents($pointer); |
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$result->keyLookup = $result->relativeLevels !== null && $path === '#'; |
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if (!$result->keyLookup) { |
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$result->path = self::decodePath($path); |
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} |
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return $result; |
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} |
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/** |
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* @param string[] $path |
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* @throws InvalidPointerException |
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*/ |
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public static function createFromParameters(array $path, ?int $relativeLevels = null, ?bool $isKeyLookup = false): self |
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{ |
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self::validateRelativePointerParams($relativeLevels, $isKeyLookup); |
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$result = new self(); |
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$result->relativeLevels = $relativeLevels; |
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$result->keyLookup = $isKeyLookup ?? false; |
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foreach ($path as $component) { |
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$result->path[] = (string)$component; |
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} |
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return $result; |
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} |
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public function getPath(): array |
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{ |
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return $this->path; |
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} |
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public function getRelativeLevels(): ?int |
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{ |
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return $this->relativeLevels; |
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} |
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public function isRelative(): bool |
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{ |
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return $this->relativeLevels !== null; |
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} |
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public function isKeyLookup(): bool |
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{ |
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return $this->keyLookup; |
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} |
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public function __toString(): string |
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{ |
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if (isset($this->string)) { |
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return $this->string; |
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} |
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$this->string = ''; |
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if ($this->relativeLevels !== null) { |
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$this->string .= $this->relativeLevels; |
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} |
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$this->string .= $this->keyLookup |
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? '#' |
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: self::encodePath($this->path); |
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return $this->string; |
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} |
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} |
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DaveRandom /
JOM
