Discussion for redesign

environment.yml

@@ -4,29 +4,8 @@ channels:
 dependencies:
   - python>=3.10
   # runtime
-  - fenics-dolfinx=0.6.0
-  - mpi4py=3.1.4
-  - scipy
-  - pint
-  - matplotlib
-  - python-gmsh=4.11.1
-  - meshio=5.3.4
-  - jsonschema
-  # tests
-  - pytest
-  - coverage
-  - toml
-  # docs
-  - sphinx
-  - sphinx-gallery
-  - myst-parser
-  - sphinx_rtd_theme
-  # environment
-  - conda-ecosystem-user-package-isolation
-  # formatting
-  - black
-  - isort
-  - pip
+  - pydantic
+  - numpy
   - pip:
     - -e .
 

src/fenicsxconcrete/bcs.py

@@ -0,0 +1,36 @@
+
+from pydantic import ConfigDict, RootModel
+from pydantic.dataclasses import dataclass
+from pydantic.types import conlist
+from typing import Callable, NewType
+import numpy as np
+
+Marker = NewType('Marker', int)
+
+@dataclass(config=dict(arbitrary_types_allowed=True))
+class DirichletBCDefinition:
+    """
+    Definition of a time- and position-dependent Dirichlet boundary condition.
+    Note that functions cannot be serialized to JSON!
+    """
+    marker: Marker | list[float] | Callable[[np.ndarray], np.ndarray]
+    value: conlist(float, min_length=1, max_length=3) | Callable[[np.ndarray, float], np.ndarray]
+    subspace: int | None
+    variable: str
+
+@dataclass(config=dict(arbitrary_types_allowed=True))
+class NeumannBCDefinition:
+    """
+    Definition of a time- and position-dependent Neumann boundary condition.
+    """
+    marker: Marker
+    value: conlist(float, min_length=1, max_length=3) | Callable[[np.ndarray, float], np.ndarray] 
+
+@dataclass(config=dict(arbitrary_types_allowed=True))
+class BodyForceDefinition:
+    value: conlist(float, min_length=1, max_length=3)
+
+@dataclass(config=dict(arbitrary_types_allowed=True))
+class InitialConditionDefinition:
+    value: list[float]
+    variable: str