googleDurationToJson static method

String googleDurationToJson(BigInt seconds, int nanos, { bool asNanos = false, })

Converts a protobuf Duration to its JSON representation.

Examples: seconds=3, nanos=0 -> "3s" seconds=3, nanos=1 -> "3.000000001s" seconds=3, nanos=1000 -> "3.000001s" seconds=-3, nanos=-500000000 -> "-3.5s"

Implementation

static String googleDurationToJson(
  BigInt seconds,
  int nanos, {
  bool asNanos = false,
}) {
  if (asNanos) {
    final billion = BigInt.from(1000000000);
    final totalNanos = seconds * billion + BigInt.from(nanos);
    return totalNanos.toString();
  }
  if (nanos == 0) {
    return '${seconds}s';
  }

  final fraction = nanos.abs().toString().padLeft(9, '0');
  final trimmed = fraction.replaceFirst(RegExp(r'0+$'), '');

  return '$seconds.$trimmed'
      's';
}