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frontend/node_modules/rc-motion/es/util/diff.js

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+import _objectSpread from "@babel/runtime/helpers/esm/objectSpread2";
+import _typeof from "@babel/runtime/helpers/esm/typeof";
+export var STATUS_ADD = 'add';
+export var STATUS_KEEP = 'keep';
+export var STATUS_REMOVE = 'remove';
+export var STATUS_REMOVED = 'removed';
+export function wrapKeyToObject(key) {
+  var keyObj;
+  if (key && _typeof(key) === 'object' && 'key' in key) {
+    keyObj = key;
+  } else {
+    keyObj = {
+      key: key
+    };
+  }
+  return _objectSpread(_objectSpread({}, keyObj), {}, {
+    key: String(keyObj.key)
+  });
+}
+export function parseKeys() {
+  var keys = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
+  return keys.map(wrapKeyToObject);
+}
+export function diffKeys() {
+  var prevKeys = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
+  var currentKeys = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
+  var list = [];
+  var currentIndex = 0;
+  var currentLen = currentKeys.length;
+  var prevKeyObjects = parseKeys(prevKeys);
+  var currentKeyObjects = parseKeys(currentKeys);
+
+  // Check prev keys to insert or keep
+  prevKeyObjects.forEach(function (keyObj) {
+    var hit = false;
+    for (var i = currentIndex; i < currentLen; i += 1) {
+      var currentKeyObj = currentKeyObjects[i];
+      if (currentKeyObj.key === keyObj.key) {
+        // New added keys should add before current key
+        if (currentIndex < i) {
+          list = list.concat(currentKeyObjects.slice(currentIndex, i).map(function (obj) {
+            return _objectSpread(_objectSpread({}, obj), {}, {
+              status: STATUS_ADD
+            });
+          }));
+          currentIndex = i;
+        }
+        list.push(_objectSpread(_objectSpread({}, currentKeyObj), {}, {
+          status: STATUS_KEEP
+        }));
+        currentIndex += 1;
+        hit = true;
+        break;
+      }
+    }
+
+    // If not hit, it means key is removed
+    if (!hit) {
+      list.push(_objectSpread(_objectSpread({}, keyObj), {}, {
+        status: STATUS_REMOVE
+      }));
+    }
+  });
+
+  // Add rest to the list
+  if (currentIndex < currentLen) {
+    list = list.concat(currentKeyObjects.slice(currentIndex).map(function (obj) {
+      return _objectSpread(_objectSpread({}, obj), {}, {
+        status: STATUS_ADD
+      });
+    }));
+  }
+
+  /**
+   * Merge same key when it remove and add again:
+   *    [1 - add, 2 - keep, 1 - remove] -> [1 - keep, 2 - keep]
+   */
+  var keys = {};
+  list.forEach(function (_ref) {
+    var key = _ref.key;
+    keys[key] = (keys[key] || 0) + 1;
+  });
+  var duplicatedKeys = Object.keys(keys).filter(function (key) {
+    return keys[key] > 1;
+  });
+  duplicatedKeys.forEach(function (matchKey) {
+    // Remove `STATUS_REMOVE` node.
+    list = list.filter(function (_ref2) {
+      var key = _ref2.key,
+        status = _ref2.status;
+      return key !== matchKey || status !== STATUS_REMOVE;
+    });
+
+    // Update `STATUS_ADD` to `STATUS_KEEP`
+    list.forEach(function (node) {
+      if (node.key === matchKey) {
+        // eslint-disable-next-line no-param-reassign
+        node.status = STATUS_KEEP;
+      }
+    });
+  });
+  return list;
+}