107 lines
2.7 KiB
Python
107 lines
2.7 KiB
Python
from .basedatatypes import Undefined
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from .optional_imports import get_module
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np = get_module("numpy")
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def _py_to_js(v, widget_manager):
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"""
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Python -> Javascript ipywidget serializer
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This function must repalce all objects that the ipywidget library
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can't serialize natively (e.g. numpy arrays) with serializable
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representations
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Parameters
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----------
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v
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Object to be serialized
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widget_manager
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ipywidget widget_manager (unused)
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Returns
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-------
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any
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Value that the ipywidget library can serialize natively
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"""
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# Handle dict recursively
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# -----------------------
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if isinstance(v, dict):
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return {k: _py_to_js(v, widget_manager) for k, v in v.items()}
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# Handle list/tuple recursively
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# -----------------------------
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elif isinstance(v, (list, tuple)):
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return [_py_to_js(v, widget_manager) for v in v]
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# Handle numpy array
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# ------------------
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elif np is not None and isinstance(v, np.ndarray):
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# Convert 1D numpy arrays with numeric types to memoryviews with
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# datatype and shape metadata.
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if (
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v.ndim == 1
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and v.dtype.kind in ["u", "i", "f"]
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and v.dtype != "int64"
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and v.dtype != "uint64"
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):
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# We have a numpy array the we can directly map to a JavaScript
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# Typed array
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return {"buffer": memoryview(v), "dtype": str(v.dtype), "shape": v.shape}
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else:
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# Convert all other numpy arrays to lists
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return v.tolist()
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# Handle Undefined
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# ----------------
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if v is Undefined:
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return "_undefined_"
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# Handle simple value
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# -------------------
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else:
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return v
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def _js_to_py(v, widget_manager):
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"""
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Javascript -> Python ipywidget deserializer
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Parameters
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----------
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v
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Object to be deserialized
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widget_manager
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ipywidget widget_manager (unused)
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Returns
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-------
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any
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Deserialized object for use by the Python side of the library
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"""
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# Handle dict
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# -----------
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if isinstance(v, dict):
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return {k: _js_to_py(v, widget_manager) for k, v in v.items()}
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# Handle list/tuple
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# -----------------
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elif isinstance(v, (list, tuple)):
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return [_js_to_py(v, widget_manager) for v in v]
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# Handle Undefined
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# ----------------
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elif isinstance(v, str) and v == "_undefined_":
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return Undefined
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# Handle simple value
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# -------------------
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else:
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return v
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# Custom serializer dict for use in ipywidget traitlet definitions
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custom_serializers = {"from_json": _js_to_py, "to_json": _py_to_js}
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