def get_layers(self) -> Iterable[Tuple[str, Layer]]:
all_layers = [(v.id, v) for v in self.tileset.layers]
if not all_layers:
raise DocoptExit('Could not find any layer definitions')
duplicates = find_duplicates([k for k, v in all_layers])
if duplicates:
raise DocoptExit(f'Duplicate layer IDs found: {", ".join(duplicates)}')
if not self.layer_ids:
yield from all_layers
return
found_layers = set()
skipped_layers = set()
for layer_id, layer in all_layers:
if (layer_id in self.layer_ids) != self.exclude_layers:
found_layers.add(layer_id)
yield layer_id, layer
else:
skipped_layers.add(layer_id)
expected_result = skipped_layers if self.exclude_layers else found_layers
if self.layer_ids != expected_result:
unknown = sorted(self.layer_ids - expected_result)
raise DocoptExit(
f"Unable to find layer [{', '.join(unknown)}]. Available layers:\n" +
'\n'.join(f"* {k}" + (
f"\n{v.description}" if v.description else ''
) for k, v in all_layers)
)
def set_layer_ids(self, layer_ids: List[str], exclude_layers=False):
if exclude_layers and not layer_ids:
raise ValueError("Cannot invert layer selection if no layer ids are given")
if layer_ids:
dups = find_duplicates(layer_ids)
if dups:
raise ValueError(f"Duplicate layer IDs: {', '.join(dups)}")
self.layer_ids = set(layer_ids or [])
self.exclude_layers = exclude_layers