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<?php declare(strict_types=1);
namespace OpenCloud\Common\JsonSchema;
class JsonPatch
{
const OP_ADD = 'add';
const OP_REPLACE = 'replace';
const OP_REMOVE = 'remove';
public static function diff($src, $dest)
{
return (new static)->makeDiff($src, $dest);
}
public function makeDiff($srcStruct, $desStruct, string $path = ''): array
{
$changes = [];
if (is_object($srcStruct)) {
$changes = $this->handleObject($srcStruct, $desStruct, $path);
} elseif (is_array($srcStruct)) {
$changes = $this->handleArray($srcStruct, $desStruct, $path);
} elseif ($srcStruct != $desStruct) {
$changes[] = $this->makePatch(self::OP_REPLACE, $path, $desStruct);
}
return $changes;
}
protected function handleArray(array $srcStruct, array $desStruct, string $path): array
{
$changes = [];
if ($diff = $this->arrayDiff($desStruct, $srcStruct)) {
foreach ($diff as $key => $val) {
if (is_object($val)) {
$changes = array_merge($changes, $this->makeDiff($srcStruct[$key], $val, $this->path($path, $key)));
} else {
$op = array_key_exists($key, $srcStruct) && !in_array($srcStruct[$key], $desStruct, true)
? self::OP_REPLACE : self::OP_ADD;
$changes[] = $this->makePatch($op, $this->path($path, $key), $val);
}
}
} elseif ($srcStruct != $desStruct) {
foreach ($srcStruct as $key => $val) {
if (!in_array($val, $desStruct, true)) {
$changes[] = $this->makePatch(self::OP_REMOVE, $this->path($path, $key));
}
}
}
return $changes;
}
protected function handleObject(\stdClass $srcStruct, \stdClass $desStruct, string $path): array
{
$changes = [];
if ($this->shouldPartiallyReplace($srcStruct, $desStruct)) {
foreach ($desStruct as $key => $val) {
if (!property_exists($srcStruct, $key)) {
$changes[] = $this->makePatch(self::OP_ADD, $this->path($path, $key), $val);
} elseif ($srcStruct->$key != $val) {
$changes = array_merge($changes, $this->makeDiff($srcStruct->$key, $val, $this->path($path, $key)));
}
}
} elseif ($this->shouldPartiallyReplace($desStruct, $srcStruct)) {
foreach ($srcStruct as $key => $val) {
if (!property_exists($desStruct, $key)) {
$changes[] = $this->makePatch(self::OP_REMOVE, $this->path($path, $key));
}
}
}
return $changes;
}
protected function shouldPartiallyReplace(\stdClass $o1, \stdClass $o2): bool
{
return count(array_diff_key((array) $o1, (array) $o2)) < count($o1);
}
protected function arrayDiff(array $a1, array $a2): array
{
$result = [];
foreach ($a1 as $key => $val) {
if (!in_array($val, $a2, true)) {
$result[$key] = $val;
}
}
return $result;
}
protected function path(string $root, $path): string
{
$path = (string) $path;
if ($path === '_empty_') {
$path = '';
}
return rtrim($root, '/') . '/' . ltrim($path, '/');
}
protected function makePatch(string $op, string $path, $val = null): array
{
switch ($op) {
default:
return ['op' => $op, 'path' => $path, 'value' => $val];
case self::OP_REMOVE:
return ['op' => $op, 'path' => $path];
}
}
}
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