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""" Tablib - JSON Support
"""
import decimal
import json
from uuid import UUID
import tablib
def serialize_objects_handler(obj):
if isinstance(obj, (decimal.Decimal, UUID)):
return str(obj)
elif hasattr(obj, 'isoformat'):
return obj.isoformat()
else:
return obj
class JSONFormat:
title = 'json'
extensions = ('json', 'jsn')
@classmethod
def export_set(cls, dataset):
"""Returns JSON representation of Dataset."""
return json.dumps(dataset.dict, default=serialize_objects_handler)
@classmethod
def export_book(cls, databook):
"""Returns JSON representation of Databook."""
return json.dumps(databook._package(), default=serialize_objects_handler)
@classmethod
def import_set(cls, dset, in_stream):
"""Returns dataset from JSON stream."""
dset.wipe()
dset.dict = json.load(in_stream)
@classmethod
def import_book(cls, dbook, in_stream):
"""Returns databook from JSON stream."""
dbook.wipe()
for sheet in json.load(in_stream):
data = tablib.Dataset()
data.title = sheet['title']
data.dict = sheet['data']
dbook.add_sheet(data)
@classmethod
def detect(cls, stream):
"""Returns True if given stream is valid JSON."""
try:
json.load(stream)
return True
except (TypeError, ValueError):
return False
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