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Copy pathDotNotationPathOps.php
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433 lines (367 loc) · 11.3 KB
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<?php
declare(strict_types=1);
namespace Infocyph\ArrayKit\Array;
/** @internal */
final class DotNotationPathOps
{
/**
* Access a segment in a target array or object.
*/
public static function accessSegment(mixed $target, int|string $segment, object $missing): mixed
{
if (is_array($target) && ArraySingle::exists($target, $segment)) {
return $target[$segment];
}
if (!is_object($target)) {
return $missing;
}
$property = (string) $segment;
if (!property_exists($target, $property) && !isset($target->{$property})) {
return $missing;
}
try {
return $target->{$property};
} catch (\Error) {
return $missing;
}
}
public static function escapePathSegment(string $segment): string
{
return str_replace(
['\\', '.', '*', '{first}', '{last}'],
['\\\\', '\\.', '\\*', '\\{first}', '\\{last}'],
$segment,
);
}
/**
* Determine whether a path resolves to at least one existing value.
*
* @param array<int, string> $segments
*/
public static function matchesPath(mixed $target, array $segments, int $position = 0): bool
{
if ($position >= count($segments)) {
return true;
}
$segment = $segments[$position];
if ($segment === '*') {
$target = is_object($target) && method_exists($target, 'all') ? $target->all() : $target;
if (!is_array($target)) {
return false;
}
return array_any(
$target,
static fn(mixed $item): bool => self::matchesPath($item, $segments, $position + 1),
);
}
$missing = new \stdClass();
$normalized = self::normalizeSegment($segment, $target);
$next = self::accessSegment($target, $normalized, $missing);
return $next !== $missing
&& self::matchesPath($next, $segments, $position + 1);
}
/**
* Normalize a dot-notation segment by replacing escaped values and resolving
* special values such as '{first}' and '{last}'.
*/
public static function normalizeSegment(string $segment, mixed $target): int|string
{
return match ($segment) {
'\\*' => '*',
'\\{first}' => '{first}',
'{first}' => self::resolveFirst($target) ?? '{first}',
'\\{last}' => '{last}',
'{last}' => self::resolveLast($target) ?? '{last}',
default => self::unescapeSegment($segment),
};
}
/**
* Retrieve a value from an array using an exact key path.
*/
public static function segmentExact(mixed $array, string $path, mixed $default): mixed
{
$parts = self::splitPath($path);
foreach ($parts as $part) {
$resolved = self::unescapeSegment($part);
if (is_array($array) && ArraySingle::exists($array, $resolved)) {
$array = $array[$resolved];
} else {
return $default;
}
}
return $array;
}
/**
* Parse a dot path into escaped segments and cache compiled segments.
*
* @return array<int, string>
*/
public static function splitPath(string $path): array
{
/** @var array<string, array<int, string>> $cache */
static $cache = [];
$maxEntries = 1024;
if (isset($cache[$path])) {
return $cache[$path];
}
$segments = [];
$current = '';
$escaped = false;
$length = strlen($path);
for ($i = 0; $i < $length; $i++) {
$char = $path[$i];
if ($escaped) {
$current .= '\\' . $char;
$escaped = false;
continue;
}
if ($char === '\\') {
$escaped = true;
continue;
}
if ($char === '.') {
$segments[] = $current;
$current = '';
continue;
}
$current .= $char;
}
if ($escaped) {
$current .= '\\\\';
}
$segments[] = $current;
if (count($cache) >= $maxEntries) {
$cache = [];
}
$cache[$path] = $segments;
return $segments;
}
/**
* Traverse a target using dot-notation segments.
*
* @param array<int, string> $segments
* @param callable(mixed): mixed $defaultResolver
*/
public static function traverseGet(
mixed $target,
array $segments,
mixed $default,
object $missing,
callable $defaultResolver,
int $maxDepth = 0,
int $maxNodes = 0,
bool $throwOnTooDeep = false,
int $currentDepth = 1,
int &$visitedNodes = 0,
int $position = 0,
): mixed {
$segmentCount = count($segments);
for ($index = $position; $index < $segmentCount; $index++) {
if (!self::consumeTraversalNode($visitedNodes, $maxNodes, $throwOnTooDeep)) {
return $missing;
}
$segment = $segments[$index];
if ($segment === '*') {
return self::traverseWildcard(
$target,
$segments,
$default,
$missing,
$defaultResolver,
$maxDepth,
$maxNodes,
$throwOnTooDeep,
$currentDepth + 1,
$visitedNodes,
$index + 1,
);
}
if ($maxDepth > 0 && $currentDepth > $maxDepth) {
return self::handleTraversalLimit($missing, $throwOnTooDeep, 'Dot path traversal exceeded max depth.');
}
$normalized = self::normalizeSegment($segment, $target);
$target = self::accessSegment($target, $normalized, $missing);
if ($target === $missing) {
return $missing;
}
$currentDepth++;
}
return $target;
}
/**
* Convert escaped segment markers into literal key text.
*/
public static function unescapeSegment(string $segment): string
{
$unescaped = str_replace(
['\\.', '\\\\'],
['.', '\\'],
$segment,
);
return str_replace(
['\\*', '\\{first}', '\\{last}'],
['*', '{first}', '{last}'],
$unescaped,
);
}
/**
* @phpstan-impure
*/
private static function consumeTraversalNode(
int &$visitedNodes,
int $maxNodes,
bool $throwOnTooDeep,
): bool {
$visitedNodes++;
if ($maxNodes <= 0 || $visitedNodes <= $maxNodes) {
return true;
}
if ($throwOnTooDeep) {
throw new \RuntimeException('Dot path traversal exceeded max node count.');
}
return false;
}
private static function handleTraversalLimit(object $missing, bool $throwOnTooDeep, string $message): mixed
{
if ($throwOnTooDeep) {
throw new \RuntimeException($message);
}
return $missing;
}
/**
* @param array<int, string> $segments
*/
private static function hasWildcardFrom(array $segments, int $position): bool
{
$segmentCount = count($segments);
for ($index = $position; $index < $segmentCount; $index++) {
if ($segments[$index] === '*') {
return true;
}
}
return false;
}
/**
* Resolve the {first} segment for an array-like target.
*/
private static function resolveFirst(mixed $target): string|int|null
{
if (is_object($target) && method_exists($target, 'all')) {
$arr = $target->all();
if (!is_array($arr)) {
return null;
}
return array_key_first($arr);
}
if (is_array($target)) {
return array_key_first($target);
}
return '{first}';
}
/**
* Resolves the {last} segment for an array-like target.
*/
private static function resolveLast(mixed $target): string|int|null
{
if (is_object($target) && method_exists($target, 'all')) {
$arr = $target->all();
if (!is_array($arr)) {
return null;
}
return array_key_last($arr);
}
if (is_array($target)) {
return array_key_last($target);
}
return '{last}';
}
/**
* @param array<int, string> $segments
* @param callable(mixed): mixed $defaultResolver
*/
private static function resolveWildcardItem(
mixed $item,
array $segments,
mixed $default,
object $missing,
callable $defaultResolver,
int $maxDepth,
int $maxNodes,
bool $throwOnTooDeep,
int $currentDepth,
int &$visitedNodes,
int $position,
): mixed {
if ($maxDepth > 0 && $currentDepth > $maxDepth) {
self::handleTraversalLimit($missing, $throwOnTooDeep, 'Dot path traversal exceeded max depth.');
return $defaultResolver($default);
}
if ($position >= count($segments)) {
return $item;
}
$resolved = self::traverseGet(
$item,
$segments,
$default,
$missing,
$defaultResolver,
$maxDepth,
$maxNodes,
$throwOnTooDeep,
$currentDepth,
$visitedNodes,
$position,
);
return $resolved === $missing ? $defaultResolver($default) : $resolved;
}
/**
* Traverse a target array/object using dot-notation with wildcard support.
*
* @param array<int, string> $segments
* @param callable(mixed): mixed $defaultResolver
*/
private static function traverseWildcard(
mixed $target,
array $segments,
mixed $default,
object $missing,
callable $defaultResolver,
int $maxDepth,
int $maxNodes,
bool $throwOnTooDeep,
int $currentDepth,
int &$visitedNodes,
int $position,
): mixed {
$target = is_object($target) && method_exists($target, 'all') ? $target->all() : $target;
if (!is_array($target)) {
return $missing;
}
$result = [];
foreach ($target as $item) {
if (!self::consumeTraversalNode($visitedNodes, $maxNodes, $throwOnTooDeep)) {
break;
}
$result[] = self::resolveWildcardItem(
$item,
$segments,
$default,
$missing,
$defaultResolver,
$maxDepth,
$maxNodes,
$throwOnTooDeep,
$currentDepth,
$visitedNodes,
$position,
);
if (!$throwOnTooDeep && $maxNodes > 0 && $visitedNodes >= $maxNodes) {
break;
}
}
if (self::hasWildcardFrom($segments, $position)) {
return ArrayMulti::collapse($result);
}
return $result;
}
}