@tldraw/store
Version:
tldraw infinite canvas SDK (store).
68 lines (67 loc) • 2.07 kB
JavaScript
import { objectMapEntries } from "@tldraw/utils";
function createEmptyRecordsDiff() {
return { added: {}, updated: {}, removed: {} };
}
function reverseRecordsDiff(diff) {
const result = { added: diff.removed, removed: diff.added, updated: {} };
for (const [from, to] of Object.values(diff.updated)) {
result.updated[from.id] = [to, from];
}
return result;
}
function isRecordsDiffEmpty(diff) {
return Object.keys(diff.added).length === 0 && Object.keys(diff.updated).length === 0 && Object.keys(diff.removed).length === 0;
}
function squashRecordDiffs(diffs) {
const result = { added: {}, removed: {}, updated: {} };
squashRecordDiffsMutable(result, diffs);
return result;
}
function squashRecordDiffsMutable(target, diffs) {
for (const diff of diffs) {
for (const [id, value] of objectMapEntries(diff.added)) {
if (target.removed[id]) {
const original = target.removed[id];
delete target.removed[id];
if (original !== value) {
target.updated[id] = [original, value];
}
} else {
target.added[id] = value;
}
}
for (const [id, [_from, to]] of objectMapEntries(diff.updated)) {
if (target.added[id]) {
target.added[id] = to;
delete target.updated[id];
delete target.removed[id];
continue;
}
if (target.updated[id]) {
target.updated[id] = [target.updated[id][0], to];
delete target.removed[id];
continue;
}
target.updated[id] = diff.updated[id];
delete target.removed[id];
}
for (const [id, value] of objectMapEntries(diff.removed)) {
if (target.added[id]) {
delete target.added[id];
} else if (target.updated[id]) {
target.removed[id] = target.updated[id][0];
delete target.updated[id];
} else {
target.removed[id] = value;
}
}
}
}
export {
createEmptyRecordsDiff,
isRecordsDiffEmpty,
reverseRecordsDiff,
squashRecordDiffs,
squashRecordDiffsMutable
};
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