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local.ts
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local.ts
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with this
* work for additional information regarding copyright ownership. The ASF
* licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
import {ifPresent} from '@opvious/stl-utils/functions';
import {
BySheet,
Columns,
ColumnsPatch,
Range,
SheetName,
Spreadsheet,
Value,
} from './common.js';
/** In-memory spreadsheet implementation. */
export class InMemorySpreadsheet implements Spreadsheet {
private constructor(private readonly bySheet: Map<SheetName, Value[][]>) {
this.trimColumns();
}
static forColumns(arg: BySheet<Columns>): Spreadsheet {
const bySheet = new Map<SheetName, Value[][]>();
for (const [sheet, cols] of Object.entries(arg)) {
bySheet.set(
sheet,
cols.map((c) => [...c])
);
}
return new InMemorySpreadsheet(bySheet);
}
static forCsvs(arg: BySheet<string>): Spreadsheet {
const bySheet = new Map<SheetName, Value[][]>();
for (const [sheet, csv] of Object.entries(arg)) {
const rows = csv
.trim()
.split('\n')
.map((r) => r.split(','));
const width = Math.max(...rows.map((r) => r.length));
const cols = Array.from<unknown, Value[]>({length: width}, () => []);
for (const row of rows) {
for (let j = 0; j < width; j++) {
const val = row[j]?.trim() ?? '';
const num = val === '' ? NaN : +val;
cols[j]!.push(isNaN(num) ? val : num);
}
}
bySheet.set(sheet, cols);
}
return new InMemorySpreadsheet(bySheet);
}
activeSheets(): ReadonlyArray<SheetName> {
return [...this.bySheet.keys()];
}
readColumns(rgs: ReadonlyArray<Range>): ReadonlyArray<Columns> {
const ret: Columns[] = [];
for (const rg of rgs) {
const cols = this.sheetColumns(rg.sheet);
const scols = cols.slice((rg.left ?? 1) - 1, rg.right);
const tcols = scols.map((c) => c.slice((rg.top ?? 1) - 1, rg.bottom));
trimColumns(tcols);
ret.push(tcols);
}
return ret;
}
updateColumns(patches: ReadonlyArray<ColumnsPatch>): void {
for (const {range: rg, columns: src} of patches) {
const j0 = (rg.left ?? 1) - 1;
const width = Math.min(
ifPresent(rg.right, (s) => s - j0) ?? Infinity,
src.length
);
const i0 = (rg.top ?? 1) - 1;
const height = Math.min(
ifPresent(rg.bottom, (s) => s - i0) ?? Infinity,
Math.max(...src.map((c) => c.length))
);
const dst = this.sheetColumns(rg.sheet);
for (let dj = 0; dj < width; dj++) {
const j = j0 + dj;
while (dst.length <= j) {
dst.push([]);
}
const col = dst[j]!;
while (col.length < i0) {
col.push('');
}
for (let di = 0; di < height; di++) {
col[i0 + di] = src[dj]?.[di] ?? '';
}
}
}
this.trimColumns();
}
private sheetColumns(sheet: SheetName): Value[][] {
const cols = this.bySheet.get(sheet);
if (!cols) {
throw new Error('Sheet not found ' + sheet);
}
return cols;
}
private trimColumns(): void {
for (const cols of this.bySheet.values()) {
trimColumns(cols);
}
}
}
function trimColumns(cols: Value[][]): void {
cols.forEach((c) => trimEnd(c, (v) => v !== ''));
trimEnd(cols, (c) => c.length);
}
function trimEnd<V>(arr: V[], fn: (val: V) => unknown): void {
while (arr.length && !fn(arr[arr.length - 1]!)) {
arr.pop();
}
}