add support for de/serializing objects with json and msgpack

.gitignore

@@ -96,6 +96,8 @@ venv/
 ENV/
 env.bak/
 venv.bak/
+venv-*
+.venv-*
 
 # Spyder project settings
 .spyderproject

requirements-dev.txt

@@ -1,10 +1,10 @@
 #
-# This file is autogenerated by pip-compile with python 3.10
+# This file is autogenerated by pip-compile with python 3.11
 # To update, run:
 #
 #    pip-compile --output-file=requirements-dev.txt requirements-dev.in
 #
-attrs==21.4.0
+attrs==22.1.0
     # via
     #   -c requirements.txt
     #   pytest

requirements.txt

@@ -1,23 +1,27 @@
 #
-# This file is autogenerated by pip-compile with python 3.10
+# This file is autogenerated by pip-compile with python 3.11
 # To update, run:
 #
-#    pip-compile --extra=converters --extra=lxml setup.cfg
+#    pip-compile --extra=converters --extra=json --extra=lxml --extra=msgpack setup.cfg
 #
 appdirs==1.4.4
     # via fs
-attrs==21.4.0
+attrs==22.1.0
     # via
     #   cattrs
     #   ufoLib2 (setup.cfg)
-cattrs==1.10.0
+cattrs==22.2.0
     # via ufoLib2 (setup.cfg)
 fonttools[ufo]==4.29.1
     # via ufoLib2 (setup.cfg)
 fs==2.4.15
     # via fonttools
 lxml==4.9.1
     # via ufoLib2 (setup.cfg)
+msgpack==1.0.4
+    # via ufoLib2 (setup.cfg)
+orjson==3.7.8 ; platform_python_implementation != "PyPy"
+    # via ufoLib2 (setup.cfg)
 pytz==2021.3
     # via fs
 six==1.16.0

setup.cfg

@@ -22,7 +22,7 @@ package_dir = =src
 packages = find:
 python_requires = >=3.7
 install_requires =
-    attrs >= 20.1.0
+    attrs >= 22.1.0
     fonttools[ufo] >= 4.0.0
     typing_extensions ; python_version < "3.8"
 
@@ -33,6 +33,12 @@ install_requires =
 [options.extras_require]
 lxml = lxml
 converters = cattrs >= 1.10.0
+json =
+    cattrs >= 22.2.0
+    orjson ; platform_python_implementation != 'PyPy'
+msgpack =
+    cattrs >= 22.2.0
+    msgpack
 
 [options.packages.find]
 where = src

src/ufoLib2/converters.py

@@ -4,9 +4,9 @@
 from functools import partial
 from typing import Any, Callable, Tuple, Type, cast
 
-from attr import fields, has, resolve_types
-from cattr import GenConverter
-from cattr.gen import (
+from attrs import fields, has, resolve_types
+from cattrs import Converter
+from cattrs.gen import (
     AttributeOverride,
     make_dict_structure_fn,
     make_dict_unstructure_fn,
@@ -49,7 +49,7 @@ def is_ufoLib2_class_with_custom_structure(cls: Type[Any]) -> bool:
     return is_ufoLib2_class(cls) and hasattr(cls, "_structure")
 
 
-def register_hooks(conv: GenConverter, allow_bytes: bool = True) -> None:
+def register_hooks(conv: Converter, allow_bytes: bool = True) -> None:
     def attrs_hook_factory(
         cls: Type[Any], gen_fn: Callable[..., Callable[[Any], Any]], structuring: bool
     ) -> Callable[[Any], Any]:
@@ -59,7 +59,9 @@ def attrs_hook_factory(
         attribs = fields(base)
         # PEP563 postponed annotations need resolving as we check Attribute.type below
         resolve_types(base)
-        kwargs: dict[str, bool | AttributeOverride] = {}
+        kwargs: dict[str, bool | AttributeOverride] = {
+            "_cattrs_detailed_validation": conv.detailed_validation
+        }
         if structuring:
             kwargs["_cattrs_forbid_extra_keys"] = conv.forbid_extra_keys
             kwargs["_cattrs_prefer_attrib_converters"] = conv._prefer_attrib_converters
@@ -71,7 +73,7 @@ def attrs_hook_factory(
                 # classes that don't have a custom hook registered) check for any
                 # type_overrides (Dict[Type, AttributeOverride]); they allow a custom
                 # converter to omit specific attributes of given type e.g.:
-                # >>> conv = GenConverter(type_overrides={Image: override(omit=True)})
+                # >>> conv = Converter(type_overrides={Image: override(omit=True)})
                 attrib_override = conv.type_overrides[a.type]
             else:
                 # by default, we omit all Optional attributes (i.e. with None default),
@@ -134,7 +136,7 @@ def structure_bytes(v: str, _: Any) -> bytes:
         conv.register_structure_hook(bytes, structure_bytes)
 
 
-default_converter = GenConverter(
+default_converter = Converter(
     omit_if_default=True,
     forbid_extra_keys=True,
     prefer_attrib_converters=False,
@@ -143,3 +145,11 @@ def structure_bytes(v: str, _: Any) -> bytes:
 
 structure = default_converter.structure
 unstructure = default_converter.unstructure
+
+# same as default_converter but allows bytes
+binary_converter = Converter(
+    omit_if_default=True,
+    forbid_extra_keys=True,
+    prefer_attrib_converters=False,
+)
+register_hooks(binary_converter, allow_bytes=True)

src/ufoLib2/objects/anchor.py

@@ -2,11 +2,13 @@
 
 from typing import Optional
 
-from attr import define
+from attrs import define
 
 from ufoLib2.objects.misc import AttrDictMixin
+from ufoLib2.serde import serde
 
 
+@serde
 @define
 class Anchor(AttrDictMixin):
     """Represents a single anchor.

src/ufoLib2/objects/component.py

@@ -3,17 +3,19 @@
 import warnings
 from typing import Optional
 
-from attr import define, field
+from attrs import define, field
 from fontTools.misc.transform import Identity, Transform
 from fontTools.pens.basePen import AbstractPen
 from fontTools.pens.pointPen import AbstractPointPen, PointToSegmentPen
 
 from ufoLib2.objects.misc import BoundingBox
+from ufoLib2.serde import serde
 from ufoLib2.typing import GlyphSet
 
 from .misc import _convert_transform, getBounds, getControlBounds
 
 
+@serde
 @define
 class Component:
     """Represents a reference to another glyph in the same layer.

src/ufoLib2/objects/contour.py

@@ -4,12 +4,13 @@
 from collections.abc import MutableSequence
 from typing import TYPE_CHECKING, Iterable, Iterator, List, Optional, overload
 
-from attr import define, field
+from attrs import define, field
 from fontTools.pens.basePen import AbstractPen
 from fontTools.pens.pointPen import AbstractPointPen, PointToSegmentPen
 
 from ufoLib2.objects.misc import BoundingBox, getBounds, getControlBounds
 from ufoLib2.objects.point import Point
+from ufoLib2.serde import serde
 from ufoLib2.typing import GlyphSet
 
 # For Python 3.7 compatibility.
@@ -19,6 +20,7 @@
     ContourMapping = MutableSequence
 
 
+@serde
 @define
 class Contour(ContourMapping):
     """Represents a contour as a list of points.

src/ufoLib2/objects/dataSet.py

@@ -3,8 +3,10 @@
 from fontTools.ufoLib import UFOReader, UFOWriter
 
 from ufoLib2.objects.misc import DataStore
+from ufoLib2.serde import serde
 
 
+@serde
 class DataSet(DataStore):
     """Represents a mapping of POSIX filename strings to arbitrary data bytes.
 

src/ufoLib2/objects/features.py

@@ -3,15 +3,18 @@
 import re
 from typing import TYPE_CHECKING, Type
 
-from attr import define
+from attrs import define
+
+from ufoLib2.serde import serde
 
 if TYPE_CHECKING:
-    from cattr import GenConverter
+    from cattrs import Converter
 
 
 RE_NEWLINES = re.compile(r"\r\n|\r")
 
 
+@serde
 @define
 class Features:
     """A data class representing UFO features.
@@ -33,11 +36,11 @@ def normalize_newlines(self) -> Features:
         self.text = RE_NEWLINES.sub("\n", self.text)
         return self
 
-    def _unstructure(self, converter: GenConverter) -> str:
+    def _unstructure(self, converter: Converter) -> str:
         del converter  # unused
         return self.text
 
     @staticmethod
-    def _structure(data: str, cls: Type[Features], converter: GenConverter) -> Features:
+    def _structure(data: str, cls: Type[Features], converter: Converter) -> Features:
         del converter  # unused
         return cls(data)

src/ufoLib2/objects/font.py

@@ -18,7 +18,7 @@
 
 import fs.base
 import fs.tempfs
-from attr import define, field
+from attrs import define, field
 from fontTools.ufoLib import UFOFileStructure, UFOReader, UFOWriter
 
 from ufoLib2.constants import DEFAULT_LAYER_NAME
@@ -35,9 +35,12 @@
 from ufoLib2.objects.misc import (
     BoundingBox,
     _deepcopy_unlazify_attrs,
+    _getstate_unlazify_attrs,
     _object_lib,
     _prune_object_libs,
+    _setstate_attrs,
 )
+from ufoLib2.serde import serde
 from ufoLib2.typing import HasIdentifier, PathLike, T
 
 
@@ -73,6 +76,7 @@ def _set_kerning(self: Font, value: Mapping[KerningPair, float]) -> None:
     self._kerning = _convert_Kerning(value)
 
 
+@serde
 @define(kw_only=True)
 class Font:
     """A data class representing a single Unified Font Object (UFO).
@@ -163,9 +167,7 @@ class Font:
     """ImageSet: A mapping of image file paths to arbitrary image data."""
 
     # init=False args, set by alternate open/read classmethod constructors
-    _path: Optional[PathLike] = field(
-        default=None, metadata=dict(copyable=False), eq=False, init=False
-    )
+    _path: Optional[PathLike] = field(default=None, eq=False, init=False)
     _lazy: Optional[bool] = field(default=None, init=False, eq=False)
     _reader: Optional[UFOReader] = field(default=None, init=False, eq=False)
     _fileStructure: Optional[UFOFileStructure] = field(
@@ -318,6 +320,9 @@ def unlazify(self) -> None:
 
     __deepcopy__ = _deepcopy_unlazify_attrs
 
+    __getstate__ = _getstate_unlazify_attrs
+    __setstate__ = _setstate_attrs
+
     @property
     def glyphOrder(self) -> list[str]:
         """The font's glyph order.

src/ufoLib2/objects/glyph.py

@@ -3,7 +3,7 @@
 from copy import deepcopy
 from typing import Any, Iterator, List, Mapping, Optional, cast
 
-from attr import define, field
+from attrs import define, field
 from fontTools.misc.transform import Transform
 from fontTools.pens.basePen import AbstractPen
 from fontTools.pens.pointPen import (
@@ -20,9 +20,11 @@
 from ufoLib2.objects.lib import Lib, _convert_Lib, _get_lib, _set_lib
 from ufoLib2.objects.misc import BoundingBox, _object_lib, getBounds, getControlBounds
 from ufoLib2.pointPens.glyphPointPen import GlyphPointPen
+from ufoLib2.serde import serde
 from ufoLib2.typing import GlyphSet, HasIdentifier
 
 
+@serde
 @define
 class Glyph:
     """Represents a glyph, containing contours, components, anchors and various

src/ufoLib2/objects/guideline.py

@@ -2,11 +2,13 @@
 
 from typing import Optional
 
-from attr import define
+from attrs import define
 
 from ufoLib2.objects.misc import AttrDictMixin
+from ufoLib2.serde import serde
 
 
+@serde
 @define
 class Guideline(AttrDictMixin):
     """Represents a single guideline.

src/ufoLib2/objects/image.py

@@ -3,9 +3,11 @@
 from collections.abc import Mapping
 from typing import TYPE_CHECKING, Any, ClassVar, Iterator, Optional, Tuple
 
-from attr import define, field
+from attrs import define, field
 from fontTools.misc.transform import Identity, Transform
 
+from ufoLib2.serde import serde
+
 from .misc import _convert_transform
 
 # For Python 3.7 compatibility.
@@ -15,6 +17,7 @@
     ImageMapping = Mapping
 
 
+@serde
 @define
 class Image(ImageMapping):
     """Represents a background image reference.

src/ufoLib2/objects/imageSet.py

@@ -3,8 +3,10 @@
 from fontTools.ufoLib import UFOReader, UFOWriter
 
 from ufoLib2.objects.misc import DataStore
+from ufoLib2.serde import serde
 
 
+@serde
 class ImageSet(DataStore):
     """Represents a mapping of POSIX filename strings to arbitrary image data.
 

src/ufoLib2/objects/info/__init__.py

@@ -4,12 +4,13 @@
 from functools import partial
 from typing import Any, Callable, List, Mapping, Optional, Sequence, TypeVar
 
-import attr
-from attr import define, field
+import attrs
+from attrs import define, field
 from fontTools.ufoLib import UFOReader
 
 from ufoLib2.objects.guideline import Guideline
 from ufoLib2.objects.misc import AttrDictMixin
+from ufoLib2.serde import serde
 
 from .woff import (
     WoffMetadataCopyright,
@@ -59,7 +60,7 @@ def _positive(instance: Any, attribute: Any, value: int) -> None:
         )
 
 
-_optional_positive = attr.validators.optional(_positive)
+_optional_positive = attrs.validators.optional(_positive)
 
 
 # or maybe use IntFlag?
@@ -170,6 +171,7 @@ def _dict_list_setter_property(cls: type[Tc], name: str | None = None) -> Any:
     )
 
 
+@serde
 @define
 class Info:
     """A data class representing the contents of fontinfo.plist.