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frontend/src/lib/components/grid/utils.ts

@@ -0,0 +1,39 @@
+export function fromGridRef(ref: string): [number, number] {
+	const match = ref.match(/^([A-Z]+)([0-9]+)$/i);
+	if (!match) throw new Error('Invalid reference');
+
+	const [, letters, rowStr] = match;
+
+	let col = 0;
+	for (let i = 0; i < letters.length; i++) {
+		col = col * 26 + (letters.charCodeAt(i) - 64); // 'A' = 65 → 1
+	}
+
+	const row = parseInt(rowStr, 10);
+	return [row - 1, col - 1];
+}
+
+export function toColLetter(col: number): string {
+	let result = '';
+	let n = col;
+	while (n > 0) {
+		const rem = (n - 1) % 26;
+		result = String.fromCharCode(65 + rem) + result; // 65 = 'A'
+		n = Math.floor((n - 1) / 26);
+	}
+
+	return result;
+}
+
+export function toGridRef(row: number, col: number): string {
+	row++;
+	col++;
+	return toColLetter(col) + row.toString();
+}
+
+export type CellValue = number | string | undefined;
+
+export interface CellData {
+	raw_val: string;
+	val: CellValue;
+}