130 lines
3.6 KiB
JavaScript
130 lines
3.6 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 { pipe } from "../../Function.js";
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import * as Data from "../data.js";
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/** @internal */
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export const ChunkPatchTypeId = /*#__PURE__*/Symbol.for("effect/DifferChunkPatch");
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function variance(a) {
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return a;
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}
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const PatchProto = {
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...Data.Structural.prototype,
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[ChunkPatchTypeId]: {
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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 AppendProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "Append"
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});
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const makeAppend = values => {
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const o = Object.create(AppendProto);
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o.values = values;
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return o;
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};
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const SliceProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "Slice"
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});
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const makeSlice = (from, until) => {
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const o = Object.create(SliceProto);
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o.from = from;
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o.until = until;
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return o;
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};
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const UpdateProto = /*#__PURE__*/Object.assign(/*#__PURE__*/Object.create(PatchProto), {
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_tag: "Update"
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});
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const makeUpdate = (index, patch) => {
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const o = Object.create(UpdateProto);
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o.index = index;
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o.patch = patch;
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return o;
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};
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/** @internal */
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export const diff = options => {
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let i = 0;
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let patch = empty();
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while (i < options.oldValue.length && i < options.newValue.length) {
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const oldElement = Chunk.unsafeGet(i)(options.oldValue);
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const newElement = Chunk.unsafeGet(i)(options.newValue);
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const valuePatch = options.differ.diff(oldElement, newElement);
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if (!Equal.equals(valuePatch, options.differ.empty)) {
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patch = pipe(patch, combine(makeUpdate(i, valuePatch)));
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}
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i = i + 1;
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}
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if (i < options.oldValue.length) {
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patch = pipe(patch, combine(makeSlice(0, i)));
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}
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if (i < options.newValue.length) {
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patch = pipe(patch, combine(makeAppend(Chunk.drop(i)(options.newValue))));
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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(3, (self, oldValue, differ) => {
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if (self._tag === "Empty") {
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return oldValue;
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}
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let chunk = oldValue;
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let patches = Chunk.of(self);
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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 "AndThen":
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{
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patches = Chunk.prepend(head.first)(Chunk.prepend(head.second)(tail));
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break;
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}
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case "Append":
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{
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chunk = Chunk.appendAll(head.values)(chunk);
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patches = tail;
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break;
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}
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case "Slice":
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{
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const array = Chunk.toReadonlyArray(chunk);
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chunk = Chunk.unsafeFromArray(array.slice(head.from, head.until));
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patches = tail;
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break;
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}
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case "Update":
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{
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const array = Chunk.toReadonlyArray(chunk);
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array[head.index] = differ.patch(head.patch, array[head.index]);
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chunk = Chunk.unsafeFromArray(array);
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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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return chunk;
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});
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//# sourceMappingURL=chunkPatch.js.map
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