143 lines
4.0 KiB
JavaScript
143 lines
4.0 KiB
JavaScript
import * as Chunk from "../../Chunk.js";
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import * as Equal from "../../Equal.js";
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import * as Dual from "../../Function.js";
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import { makeContext } from "../context.js";
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import { Structural } from "../data.js";
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/** @internal */
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export const ContextPatchTypeId = /*#__PURE__*/Symbol.for("effect/DifferContextPatch");
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function variance(a) {
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return a;
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}
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/** @internal */
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const PatchProto = {
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...Structural.prototype,
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[ContextPatchTypeId]: {
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_Value: variance,
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_Patch: variance
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}
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};
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const EmptyProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "Empty"
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});
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const _empty = /*#__PURE__*/Object.create(EmptyProto);
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/**
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* @internal
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*/
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export const empty = () => _empty;
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const AndThenProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "AndThen"
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});
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const makeAndThen = (first, second) => {
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const o = Object.create(AndThenProto);
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o.first = first;
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o.second = second;
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return o;
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};
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const AddServiceProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "AddService"
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});
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const makeAddService = (key, service) => {
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const o = Object.create(AddServiceProto);
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o.key = key;
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o.service = service;
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return o;
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};
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const RemoveServiceProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "RemoveService"
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});
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const makeRemoveService = key => {
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const o = Object.create(RemoveServiceProto);
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o.key = key;
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return o;
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};
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const UpdateServiceProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "UpdateService"
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});
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const makeUpdateService = (key, update) => {
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const o = Object.create(UpdateServiceProto);
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o.key = key;
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o.update = update;
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return o;
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};
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/** @internal */
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export const diff = (oldValue, newValue) => {
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const missingServices = new Map(oldValue.unsafeMap);
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let patch = empty();
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for (const [tag, newService] of newValue.unsafeMap.entries()) {
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if (missingServices.has(tag)) {
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const old = missingServices.get(tag);
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missingServices.delete(tag);
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if (!Equal.equals(old, newService)) {
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patch = combine(makeUpdateService(tag, () => newService))(patch);
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}
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} else {
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missingServices.delete(tag);
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patch = combine(makeAddService(tag, newService))(patch);
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}
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}
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for (const [tag] of missingServices.entries()) {
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patch = combine(makeRemoveService(tag))(patch);
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}
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return patch;
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};
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/** @internal */
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export const combine = /*#__PURE__*/Dual.dual(2, (self, that) => makeAndThen(self, that));
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/** @internal */
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export const patch = /*#__PURE__*/Dual.dual(2, (self, context) => {
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if (self._tag === "Empty") {
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return context;
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}
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let wasServiceUpdated = false;
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let patches = Chunk.of(self);
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const updatedContext = new Map(context.unsafeMap);
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while (Chunk.isNonEmpty(patches)) {
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const head = Chunk.headNonEmpty(patches);
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const tail = Chunk.tailNonEmpty(patches);
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switch (head._tag) {
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case "Empty":
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{
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patches = tail;
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break;
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}
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case "AddService":
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{
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updatedContext.set(head.key, head.service);
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patches = tail;
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break;
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}
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case "AndThen":
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{
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patches = Chunk.prepend(Chunk.prepend(tail, head.second), head.first);
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break;
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}
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case "RemoveService":
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{
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updatedContext.delete(head.key);
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patches = tail;
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break;
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}
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case "UpdateService":
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{
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updatedContext.set(head.key, head.update(updatedContext.get(head.key)));
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wasServiceUpdated = true;
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patches = tail;
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break;
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}
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}
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}
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if (!wasServiceUpdated) {
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return makeContext(updatedContext);
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}
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const map = new Map();
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for (const [tag] of context.unsafeMap) {
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if (updatedContext.has(tag)) {
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map.set(tag, updatedContext.get(tag));
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updatedContext.delete(tag);
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}
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}
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for (const [tag, s] of updatedContext) {
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map.set(tag, s);
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}
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return makeContext(map);
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});
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//# sourceMappingURL=contextPatch.js.map
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