Chain foldFrames()

in lib/src/chain.dart [219:241]

• 14 lines of code
• 6 McCabe index (conditional complexity)

  Chain foldFrames(bool Function(Frame) predicate, {bool terse = false}) {
    var foldedTraces =
        traces.map((trace) => trace.foldFrames(predicate, terse: terse));
    var nonEmptyTraces = foldedTraces.where((trace) {
      // Ignore traces that contain only folded frames.
      if (trace.frames.length > 1) return true;
      if (trace.frames.isEmpty) return false;

      // In terse mode, the trace may have removed an outer folded frame,
      // leaving a single non-folded frame. We can detect a folded frame because
      // it has no line information.
      if (!terse) return false;
      return trace.frames.single.line != null;
    });

    // If all the traces contain only internal processing, preserve the last
    // (top-most) one so that the chain isn't empty.
    if (nonEmptyTraces.isEmpty && foldedTraces.isNotEmpty) {
      return Chain([foldedTraces.last]);
    }

    return Chain(nonEmptyTraces);
  }