coala-analyzer / coala

coalib/output/JSONEncoder.py

import collections
import json
from datetime import datetime

from coalib.misc.Decorators import get_public_members
from coalib.settings.FunctionMetadata import FunctionMetadata


def create_json_encoder(**kwargs):
    class JSONEncoder(json.JSONEncoder):

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        @classmethod

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        def _filter_params(cls, op, nop):
            params = set(op) | set(nop)

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            return {key: kwargs[key] for key in set(kwargs) & (params)}

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        def default(self, obj):
            if hasattr(obj, "__json__"):

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                fdata = FunctionMetadata.from_function(obj.__json__)
                params = self._filter_params(
                    fdata.optional_params, fdata.non_optional_params)

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                return obj.__json__(**params)

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            elif isinstance(obj, collections.Iterable):

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                return list(obj)
            elif isinstance(obj, datetime):

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                return obj.isoformat()
            elif hasattr(obj, "__getitem__") and hasattr(obj, "keys"):
                return dict(obj)
            elif hasattr(obj, "__dict__"):
                return {member: getattr(obj, member)

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                        for member in get_public_members(obj)}

            return json.JSONEncoder.default(self, obj)

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    return JSONEncoder

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