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