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node_modules/effect/dist/esm/internal/fiberRefs/patch.js

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+import * as Arr from "../../Array.js";
+import { equals } from "../../Equal.js";
+import { dual } from "../../Function.js";
+import * as fiberRefs_ from "../fiberRefs.js";
+/** @internal */
+export const OP_EMPTY = "Empty";
+/** @internal */
+export const OP_ADD = "Add";
+/** @internal */
+export const OP_REMOVE = "Remove";
+/** @internal */
+export const OP_UPDATE = "Update";
+/** @internal */
+export const OP_AND_THEN = "AndThen";
+/** @internal */
+export const empty = {
+  _tag: OP_EMPTY
+};
+/** @internal */
+export const diff = (oldValue, newValue) => {
+  const missingLocals = new Map(oldValue.locals);
+  let patch = empty;
+  for (const [fiberRef, pairs] of newValue.locals.entries()) {
+    const newValue = Arr.headNonEmpty(pairs)[1];
+    const old = missingLocals.get(fiberRef);
+    if (old !== undefined) {
+      const oldValue = Arr.headNonEmpty(old)[1];
+      if (!equals(oldValue, newValue)) {
+        patch = combine({
+          _tag: OP_UPDATE,
+          fiberRef,
+          patch: fiberRef.diff(oldValue, newValue)
+        })(patch);
+      }
+    } else {
+      patch = combine({
+        _tag: OP_ADD,
+        fiberRef,
+        value: newValue
+      })(patch);
+    }
+    missingLocals.delete(fiberRef);
+  }
+  for (const [fiberRef] of missingLocals.entries()) {
+    patch = combine({
+      _tag: OP_REMOVE,
+      fiberRef
+    })(patch);
+  }
+  return patch;
+};
+/** @internal */
+export const combine = /*#__PURE__*/dual(2, (self, that) => ({
+  _tag: OP_AND_THEN,
+  first: self,
+  second: that
+}));
+/** @internal */
+export const patch = /*#__PURE__*/dual(3, (self, fiberId, oldValue) => {
+  let fiberRefs = oldValue;
+  let patches = Arr.of(self);
+  while (Arr.isNonEmptyReadonlyArray(patches)) {
+    const head = Arr.headNonEmpty(patches);
+    const tail = Arr.tailNonEmpty(patches);
+    switch (head._tag) {
+      case OP_EMPTY:
+        {
+          patches = tail;
+          break;
+        }
+      case OP_ADD:
+        {
+          fiberRefs = fiberRefs_.updateAs(fiberRefs, {
+            fiberId,
+            fiberRef: head.fiberRef,
+            value: head.value
+          });
+          patches = tail;
+          break;
+        }
+      case OP_REMOVE:
+        {
+          fiberRefs = fiberRefs_.delete_(fiberRefs, head.fiberRef);
+          patches = tail;
+          break;
+        }
+      case OP_UPDATE:
+        {
+          const value = fiberRefs_.getOrDefault(fiberRefs, head.fiberRef);
+          fiberRefs = fiberRefs_.updateAs(fiberRefs, {
+            fiberId,
+            fiberRef: head.fiberRef,
+            value: head.fiberRef.patch(head.patch)(value)
+          });
+          patches = tail;
+          break;
+        }
+      case OP_AND_THEN:
+        {
+          patches = Arr.prepend(head.first)(Arr.prepend(head.second)(tail));
+          break;
+        }
+    }
+  }
+  return fiberRefs;
+});
+//# sourceMappingURL=patch.js.map