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node_modules/effect/dist/esm/internal/differ/hashSetPatch.js

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+import * as Chunk from "../../Chunk.js";
+import * as Dual from "../../Function.js";
+import * as HashSet from "../../HashSet.js";
+import { Structural } from "../data.js";
+/** @internal */
+export const HashSetPatchTypeId = /*#__PURE__*/Symbol.for("effect/DifferHashSetPatch");
+function variance(a) {
+  return a;
+}
+/** @internal */
+const PatchProto = {
+  ...Structural.prototype,
+  [HashSetPatchTypeId]: {
+    _Value: variance,
+    _Key: variance,
+    _Patch: variance
+  }
+};
+const EmptyProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
+  _tag: "Empty"
+});
+const _empty = /*#__PURE__*/Object.create(EmptyProto);
+/** @internal */
+export const empty = () => _empty;
+const AndThenProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
+  _tag: "AndThen"
+});
+/** @internal */
+export const makeAndThen = (first, second) => {
+  const o = Object.create(AndThenProto);
+  o.first = first;
+  o.second = second;
+  return o;
+};
+const AddProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
+  _tag: "Add"
+});
+/** @internal */
+export const makeAdd = value => {
+  const o = Object.create(AddProto);
+  o.value = value;
+  return o;
+};
+const RemoveProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
+  _tag: "Remove"
+});
+/** @internal */
+export const makeRemove = value => {
+  const o = Object.create(RemoveProto);
+  o.value = value;
+  return o;
+};
+/** @internal */
+export const diff = (oldValue, newValue) => {
+  const [removed, patch] = HashSet.reduce([oldValue, empty()], ([set, patch], value) => {
+    if (HashSet.has(value)(set)) {
+      return [HashSet.remove(value)(set), patch];
+    }
+    return [set, combine(makeAdd(value))(patch)];
+  })(newValue);
+  return HashSet.reduce(patch, (patch, value) => combine(makeRemove(value))(patch))(removed);
+};
+/** @internal */
+export const combine = /*#__PURE__*/Dual.dual(2, (self, that) => makeAndThen(self, that));
+/** @internal */
+export const patch = /*#__PURE__*/Dual.dual(2, (self, oldValue) => {
+  if (self._tag === "Empty") {
+    return oldValue;
+  }
+  let set = oldValue;
+  let patches = Chunk.of(self);
+  while (Chunk.isNonEmpty(patches)) {
+    const head = Chunk.headNonEmpty(patches);
+    const tail = Chunk.tailNonEmpty(patches);
+    switch (head._tag) {
+      case "Empty":
+        {
+          patches = tail;
+          break;
+        }
+      case "AndThen":
+        {
+          patches = Chunk.prepend(head.first)(Chunk.prepend(head.second)(tail));
+          break;
+        }
+      case "Add":
+        {
+          set = HashSet.add(head.value)(set);
+          patches = tail;
+          break;
+        }
+      case "Remove":
+        {
+          set = HashSet.remove(head.value)(set);
+          patches = tail;
+        }
+    }
+  }
+  return set;
+});
+//# sourceMappingURL=hashSetPatch.js.map