Function formatArray

console/src/platform/shell/formatRows.ts:65–96

* Formats an array for output as psql would. * * See `mz_repr::strconv::format_array` for the implementation in Materialize.

(
  vals: unknown,
  formatValue: (_: unknown) => string = formatCellDefault,
)

 * See `mz_repr::strconv::format_array` for the implementation in Materialize.
 */
function formatArray(
  vals: unknown,
  formatValue: (_: unknown) => string = formatCellDefault,
) {
  assert(Array.isArray(vals));

  let out = "{";
  let firstValue = true;
  for (const val of vals) {
    if (!firstValue) {
      out += ",";
    }

    // Format the value.
    const formattedVal = formatValue(val);

    // If the formatted value contains special characters, the value needs
    // to be escaped. Otherwise it can be emitted directly.
    if (!Array.isArray(val) && /[\s{},\\"]/.test(formattedVal)) {
      out += '"';
      // Backslash-escape any backslashes or double quotes inside the value.
      out += formattedVal.replace(/["|\\]/g, "\\$&");
      out += '"';
    } else {
      out += formattedVal;
    }

    firstValue = false;
  }
  out += "}";
  return out;
}

type FormatFn = (val: unknown) => string;