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79 lines
3.5 KiB
79 lines
3.5 KiB
import { AddRecord, BulkAddRecord, BulkRemoveRecord, BulkUpdateRecord, DocAction, getTableId,
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RemoveRecord, ReplaceTableData, TableDataAction, UpdateRecord } from "app/common/DocActions";
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import { getSetMapValue } from "app/common/gutil";
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/**
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* A little class for tracking pre-existing rows touched by a sequence of DocActions for
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* a given table.
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*/
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class RowIdTracker {
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public blockedIds = new Set<number>(); // row ids minted within the DocActions (so NOT pre-existing).
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public blocked: boolean = false; // set if all pre-existing rows are wiped/
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public ids = new Set<number>(); // set of pre-existing rows touched.
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}
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/**
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* This gets a list of pre-existing rows that the DocActions may touch. Returns
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* a list of form [tableId, Set{rowId1, rowId2, ...}].
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*/
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export function getRelatedRows(docActions: DocAction[]): ReadonlyArray<readonly [string, Set<number>]> {
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// Relate tableIds for tables with what they were before the actions, if renamed.
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const tableIds = new Map<string, string>(); // key is current tableId
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const rowIds = new Map<string, RowIdTracker>(); // key is pre-existing tableId
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const addedTables = new Set<string>(); // track newly added tables to ignore; key is current tableId
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for (const docAction of docActions) {
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const currentTableId = getTableId(docAction);
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const tableId = tableIds.get(currentTableId) || currentTableId;
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if (docAction[0] === 'RenameTable') {
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if (addedTables.has(currentTableId)) {
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addedTables.delete(currentTableId);
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addedTables.add(docAction[2]);
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continue;
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}
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tableIds.delete(currentTableId);
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tableIds.set(docAction[2], tableId);
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continue;
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}
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if (docAction[0] === 'AddTable') {
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addedTables.add(currentTableId);
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}
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if (docAction[0] === 'RemoveTable') {
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addedTables.delete(currentTableId);
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continue;
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}
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if (addedTables.has(currentTableId)) { continue; }
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// tableId will now be that prior to docActions, regardless of renames.
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const tracker = getSetMapValue(rowIds, tableId, () => new RowIdTracker());
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if (docAction[0] === 'RemoveRecord' || docAction[0] === 'BulkRemoveRecord' ||
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docAction[0] === 'UpdateRecord' || docAction[0] === 'BulkUpdateRecord') {
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// All row ids mentioned are external, unless created within this set of DocActions.
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if (!tracker.blocked) {
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for (const id of getRowIdsFromDocAction(docAction)) {
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if (!tracker.blockedIds.has(id)) { tracker.ids.add(id); }
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}
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}
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} else if (docAction[0] === 'AddRecord' || docAction[0] === 'BulkAddRecord') {
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// All row ids mentioned are created within this set of DocActions, and are not external.
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for (const id of getRowIdsFromDocAction(docAction)) { tracker.blockedIds.add(id); }
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} else if (docAction[0] === 'ReplaceTableData' || docAction[0] === 'TableData') {
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// No pre-existing rows can be referred to for this table from now on.
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tracker.blocked = true;
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}
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}
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return [...rowIds.entries()].map(([tableId, tracker]) => [tableId, tracker.ids] as const);
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}
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/**
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* Tiny helper to get the row ids mentioned in a record-related DocAction as a list
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* (even if the action is not a bulk action).
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*/
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export function getRowIdsFromDocAction(docActions: RemoveRecord | BulkRemoveRecord | AddRecord |
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BulkAddRecord | UpdateRecord | BulkUpdateRecord | ReplaceTableData |
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TableDataAction) {
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const ids = docActions[2];
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return (typeof ids === 'number') ? [ids] : ids;
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}
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