applyTo method

DiagramDocument applyTo(DiagramDocument document)

Applies every step to document alone, sharing one batch across consecutive built-in steps. Builders use it to read a staged document without replaying each step against a fresh copy.

Implementation

DiagramDocument applyTo(DiagramDocument document) {
  DiagramDocumentBatch? batch;
  for (final step in steps) {
    if (step is _BatchStep) {
      step.applyTo(batch ??= DiagramDocumentBatch(document));
    } else {
      if (batch != null) document = batch.build();
      batch = null;
      document = step.apply(document);
    }
  }
  return batch?.build() ?? document;
}