re-doing everything as a caster instead of as a parser

pytiled_parser/layer.py

@@ -0,0 +1,85 @@
+# pylint: disable=too-few-public-methods
+
+from typing import List, Optional, Union
+
+import attr
+
+from .common_types import OrderedPair, Size
+from .properties import Properties
+
+
+@attr.s(auto_attribs=True, kw_only=True)
+class Layer:
+    # FIXME:this docstring appears to be innacurate
+    """Class that all layers inherit from.
+
+    Args:
+        id: Unique ID of the layer. Each layer that added to a map gets a unique id.
+            Even if a layer is deleted, no layer ever gets the same ID.
+        name: The name of the layer object.
+        tiled_objects: List of tiled_objects in the layer.
+        offset: Rendering offset of the layer object in pixels.
+        opacity: Decimal value between 0 and 1 to determine opacity. 1 is completely
+            opaque, 0 is completely transparent.
+        properties: Properties for the layer.
+        color: The color used to display the objects in this group.
+        draworder: Whether the objects are drawn according to the order of the object
+            elements in the object group element ('manual'), or sorted by their
+            y-coordinate ('topdown'). Defaults to 'topdown'.
+            See:
+            https://doc.mapeditor.org/en/stable/manual/objects/#changing-stacking-order
+            for more info.
+    """
+
+    id_: int
+    name: str
+
+    offset: Optional[OrderedPair]
+    opacity: Optional[float]
+    properties: Optional[Properties]
+
+
+TileLayerGrid = List[List[int]]
+
+
+@attr.s(auto_attribs=True)
+class Chunk:
+    """Chunk object for infinite maps.
+
+    See: https://doc.mapeditor.org/en/stable/reference/tmx-map-format/#chunk
+
+    Attributes:
+        location: Location of chunk in tiles.
+        width: The width of the chunk in tiles.
+        height: The height of the chunk in tiles.
+        layer_data: The global tile IDs in chunky according to row.
+    """
+
+    location: OrderedPair
+    width: int
+    height: int
+    chunk_data: TileLayerGrid
+
+
+LayerData = Union[TileLayerGrid, List[Chunk]]
+# The tile data for one layer.
+#
+# Either a 2 dimensional array of integers representing the global tile IDs
+#     for a TileLayerGrid, or a list of chunks for an infinite map layer.
+
+
+@attr.s(auto_attribs=True, kw_only=True)
+class TileLayer(Layer):
+    """Tile map layer containing tiles.
+
+    See: https://doc.mapeditor.org/en/stable/reference/tmx-map-format/#layer
+
+    Args:
+        size: The width of the layer in tiles. The same as the map width unless map is
+            infitite.
+        data: Either an 2 dimensional array of integers representing the global tile
+            IDs for the map layer, or a list of chunks for an infinite map.
+    """
+
+    size: Size
+    layer_data: LayerData