Serialization/Deserialization of Dash components

1_serialize_deserialize_dash_component.py

from importlib import import_module
from pprint import pprint
from typing import List, Dict

from dash.development.base_component import Component
from dash_html_components import Div
from dash_html_components import P ,Mark

from dash_interface.helper import serialize_components

def load_class(class_namespace, class_type):
    try:
        module = import_module(class_namespace)
        class_ = getattr(module, class_type)
        return class_
    except:
        print(f"Cannot import {class_namespace}:{class_type}. Is it installed?")
        return None

    pass


def deserialize_components(component_dict: Dict):
    class_type = component_dict["type"]
    class_namespace = component_dict["namespace"].split("/")[0]
    # Try loading it
    class_ = load_class(class_namespace, class_type)
    if not class_:
        print(f"Cannot continue.")
        return None

    # we begin deserializing
    component_children = component_dict["props"]["children"]
    if isinstance(component_children, str):
        return class_(**component_dict["props"])
    elif isinstance(component_children, list):
        deserialized_children = []
        for child in component_children:
            if isinstance(child, str):
                deserialized_children.append(child)
            elif isinstance(child, dict):
                deserialized_children.append(deserialize_components(child))
        component_dict["props"]["children"] = deserialized_children
        return class_(**component_dict["props"])



def serialize_components(component: Component):
    component_dict = component.to_plotly_json()
    component_children = component_dict["props"]["children"]
    if isinstance(component_children, str):
        return component_dict
    elif not isinstance(component_children, list):
        component_children = [component_children]
    serialized_children = []
    for child in component_children:
        if isinstance(child, str):
            serialized_children.append(child)
        elif isinstance(child, Component):
            serialized_children.append(serialize_components(child))
    component_dict["props"]["children"] = serialized_children
    return component_dict

2_kind_of_test.py

# Serializing

list_things = [P("Hola!"),
               P(["Mme", Mark("Christelle", className="wadevs"), " ", Mark("Nomi", className="wadevs")]),
               P("demeurant")]


list1 = []
for l in list_things:
    result = serialize_components(l)
    lista1.append(result)
pprint(list1)

# Deserializing
components_string = """
[{'namespace': 'dash_html_components',
  'props': {'children': 'Hola!'},
  'type': 'P'},
 {'namespace': 'dash_html_components',
  'props': {'children': ['Mmme',
                         {'namespace': 'dash_html_components',
                          'props': {'children': 'Christelle',
                                    'className': 'wadevs'},
                          'type': 'Mark'},
                         ' ',
                         {'namespace': 'dash_html_components',
                          'props': {'children': 'Nomi', 'className': 'wadevs'},
                          'type': 'Mark'}]},
  'type': 'P'},
 {'namespace': 'dash_html_components',
  'props': {'children': 'demeurant'},
  'type': 'P'}]
"""

serialized_components = eval(components_string)
deserialized_components = []
for elem in serialized_components:
    test = deserialize_html_components(elem)
    deserialized_components.append(test)