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