snapshot of https://github.com/dream-num/univer.git (dev, 2026-09-16; blobs > 131072B omitted)

packages/sheets-numfmt/src/utils/scientific-notation.ts

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+/**
+ * Copyright 2023-present DreamNum Co., Ltd.
+ *
+ * Licensed 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 type { ICellData, Nullable } from '@univerjs/core';
+import { CellValueType, isDefaultFormat, isTextFormat } from '@univerjs/core';
+import { getPatternType } from './pattern';
+
+export const DEFAULT_SCIENTIFIC_NOTATION_FORMAT = '0.00E+00';
+
+export function isScientificNotationNumericCell(cell: Nullable<ICellData>): boolean {
+    return cell?.t === CellValueType.NUMBER && cell.v !== undefined && cell.v !== null && /e/i.test(String(cell.v));
+}
+
+export function getScientificNotationFormatFromCell(cell: Nullable<ICellData>): string {
+    const text = String(cell?.v);
+    const eIndex = text.search(/e/i);
+    const decimalIndex = text.indexOf('.');
+    const decimalLength = eIndex > -1 && decimalIndex > -1 ? eIndex - decimalIndex - 1 : 0;
+
+    return `0.${'0'.repeat(Math.max(2, decimalLength))}E+00`;
+}
+
+// Scientific notation numbers cannot be accurately expanded with JS number precision, so only formats that preserve
+// the notation or raw text are allowed.
+export function isAllowedPatternForScientificNotationNumber(pattern?: string): boolean {
+    return isDefaultFormat(pattern) || isTextFormat(pattern) || getPatternType(pattern) === 'scientific';
+}