Asad
21f4542e5f
- add timestamp to cache keys to properly handle deleted/replaced files - create modular LRUCache implementation to limit memory usage (20 workbooks and 255 worksheet per workbook) - added unit tets for LRUCache
51 lines
1.3 KiB
TypeScript
51 lines
1.3 KiB
TypeScript
// parse range like A1:Z100 and return information about dimensions
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export function parseRange(rangeStr: string) {
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if (!rangeStr || !rangeStr.includes(':')) { return null; }
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const parts = rangeStr.split(':');
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const startCell = parts[0];
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const endCell = parts[1];
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// extract column letters and row numbers
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const startCol = startCell.replace(/[0-9]/g, '');
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const endCol = endCell.replace(/[0-9]/g, '');
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const startRow = parseInt(startCell.replace(/[^0-9]/g, ''));
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const endRow = parseInt(endCell.replace(/[^0-9]/g, ''));
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// calc dimensions
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const startColNum = colLetterToNum(startCol);
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const endColNum = colLetterToNum(endCol);
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const totalRows = endRow - startRow + 1;
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const totalCols = endColNum - startColNum + 1;
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return {
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startRow,
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endRow,
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startCol,
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endCol,
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startColNum,
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endColNum,
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totalRows,
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totalCols
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};
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}
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// (A=1, B=2, etc.)
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export function colLetterToNum(col: string): number {
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let result = 0;
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for (let i = 0; i < col.length; i++) {
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result = result * 26 + (col.charCodeAt(i) - 64);
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}
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return result;
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}
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// (1=A, 2=B, etc.)
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export function numToColLetter(num: number): string {
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let result = '';
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while (num > 0) {
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const modulo = (num - 1) % 26;
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result = String.fromCharCode(65 + modulo) + result;
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num = Math.floor((num - modulo) / 26);
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}
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return result || 'A';
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} |