TerminalGraphicsFrame.scan constructor

TerminalGraphicsFrame.scan(String value)

Scans value for retained graphics visible in the frame.

Implementation

factory TerminalGraphicsFrame.scan(String value) {
  var hasRetainedGraphics = false;
  final retainedImageIds = <int>{};
  var untrackedGraphicsFingerprint = 0;
  var hashingUntrackedTransmission = false;

  for (final control in parseTerminalGraphicsControls(value)) {
    if (control.protocol != TerminalGraphicsProtocol.kitty) {
      continue;
    }
    if (!control.displaysImage) {
      if (hashingUntrackedTransmission) {
        untrackedGraphicsFingerprint = Object.hash(
          untrackedGraphicsFingerprint,
          control.sequence,
        );
        hashingUntrackedTransmission = control.hasMoreChunks;
      }
      continue;
    }
    hasRetainedGraphics = true;
    final id = control.imageId;
    if (id != null) {
      retainedImageIds.add(id);
      hashingUntrackedTransmission = false;
    } else {
      untrackedGraphicsFingerprint = Object.hash(
        untrackedGraphicsFingerprint,
        control.sequence,
      );
      hashingUntrackedTransmission = control.hasMoreChunks;
    }
  }

  if (!hasRetainedGraphics && retainedImageIds.isEmpty) {
    return TerminalGraphicsFrame.empty;
  }
  return TerminalGraphicsFrame(
    hasRetainedGraphics: hasRetainedGraphics,
    retainedImageIds: retainedImageIds,
    untrackedGraphicsFingerprint: untrackedGraphicsFingerprint,
  );
}