byGroup function

bool Function(String) byGroup(EditorState state, int pos, String start)

Create a function that checks if a character belongs to the same group as the starting character.

This is used for word-wise cursor movement.

Implementation

bool Function(String) byGroup(EditorState state, int pos, String start) {
  final categorize = state.charCategorizer(pos);
  var cat = categorize(start);

  return (String next) {
    final nextCat = categorize(next);
    // If started on whitespace, transition to the next category
    if (cat == CharCategory.space) cat = nextCat;
    return cat == nextCat;
  };
}