feat: csv-rows-to-columns

src/pages/tools/csv/csv-rows-to-columns/service.ts

@@ -0,0 +1,34 @@
+function compute(rows: string[][], columnCount: number): string[][] {
+  const result: string[][] = [];
+  for (let i = 0; i < rows.length; i++) {
+    const row = rows[i];
+    for (let j = 0; j < columnCount; j++) {
+      if (!result[j]) {
+        result[j] = [];
+      }
+      result[j][i] = row[j];
+    }
+  }
+  return result;
+}
+export function csvRowsToColumns(
+  input: string,
+  emptyValuesFilling: boolean,
+  customFiller: string,
+  commentCharacter: string
+): string {
+  const rows = input
+    .split('\n')
+    .map((row) => row.split(','))
+    .filter((row) => !row[0].trim().startsWith(commentCharacter));
+  const columnCount = Math.max(...rows.map((row) => row.length));
+  for (let i = 0; i < rows.length; i++) {
+    for (let j = 0; j < columnCount; j++) {
+      if (!rows[i][j]) {
+        rows[i][j] = emptyValuesFilling ? '' : customFiller;
+      }
+    }
+  }
+  const result = compute(rows, columnCount);
+  return result.join('\n');
+}