truncateLoopStacks method

void truncateLoopStacks(LoopStackDepths depths)

Restores every loop stack to depths, forgetting the loops that are removed — so a loop entered again later starts from scratch instead of resuming a stale iterator or list.

Implementation

void truncateLoopStacks(LoopStackDepths depths) {
  for (final node in loopNodeStack.skip(depths.nodes)) {
    forInIteratorMap.remove(node);
    loopEntryDepths.remove(node);
  }
  for (final node in awaitForNodeStack.skip(depths.awaitFor)) {
    loopEntryDepths.remove(node);
  }
  _shrink(loopNodeStack, depths.nodes);
  _shrink(loopEnvironmentStack, depths.environments);
  _shrink(loopInitializedStack, depths.initialized);
  _shrink(awaitForNodeStack, depths.awaitFor);
  _shrink(awaitForListStack, depths.awaitFor);
  _shrink(awaitForIndexStack, depths.awaitFor);
  if (awaitForNodeStack.isEmpty) {
    currentAwaitForList = null;
    currentAwaitForIndex = null;
  }
}