94 lines
2.9 KiB
Python
94 lines
2.9 KiB
Python
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# coding: utf-8
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"""Utilities to manipulate JSON objects."""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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from datetime import datetime
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import re
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import warnings
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from dateutil.parser import parse as _dateutil_parse
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from dateutil.tz import tzlocal
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from ipython_genutils import py3compat
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next_attr_name = '__next__' # Not sure what downstream library uses this, but left it to be safe
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#-----------------------------------------------------------------------------
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# Globals and constants
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#-----------------------------------------------------------------------------
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# timestamp formats
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ISO8601 = "%Y-%m-%dT%H:%M:%S.%f"
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ISO8601_PAT = re.compile(r"^(\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2})(\.\d{1,6})?(Z|([\+\-]\d{2}:?\d{2}))?$")
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# holy crap, strptime is not threadsafe.
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# Calling it once at import seems to help.
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datetime.strptime("1", "%d")
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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def _ensure_tzinfo(dt):
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"""Ensure a datetime object has tzinfo
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If no tzinfo is present, add tzlocal
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"""
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if not dt.tzinfo:
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# No more naïve datetime objects!
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warnings.warn(u"Interpreting naive datetime as local %s. Please add timezone info to timestamps." % dt,
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DeprecationWarning,
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stacklevel=4)
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dt = dt.replace(tzinfo=tzlocal())
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return dt
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def parse_date(s):
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"""parse an ISO8601 date string
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If it is None or not a valid ISO8601 timestamp,
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it will be returned unmodified.
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Otherwise, it will return a datetime object.
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"""
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if s is None:
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return s
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m = ISO8601_PAT.match(s)
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if m:
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dt = _dateutil_parse(s)
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return _ensure_tzinfo(dt)
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return s
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def extract_dates(obj):
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"""extract ISO8601 dates from unpacked JSON"""
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if isinstance(obj, dict):
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new_obj = {} # don't clobber
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for k,v in obj.items():
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new_obj[k] = extract_dates(v)
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obj = new_obj
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elif isinstance(obj, (list, tuple)):
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obj = [ extract_dates(o) for o in obj ]
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elif isinstance(obj, str):
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obj = parse_date(obj)
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return obj
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def squash_dates(obj):
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"""squash datetime objects into ISO8601 strings"""
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if isinstance(obj, dict):
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obj = dict(obj) # don't clobber
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for k,v in obj.items():
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obj[k] = squash_dates(v)
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elif isinstance(obj, (list, tuple)):
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obj = [ squash_dates(o) for o in obj ]
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elif isinstance(obj, datetime):
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obj = obj.isoformat()
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return obj
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def date_default(obj):
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"""default function for packing datetime objects in JSON."""
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if isinstance(obj, datetime):
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obj = _ensure_tzinfo(obj)
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return obj.isoformat().replace('+00:00', 'Z')
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else:
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raise TypeError("%r is not JSON serializable" % obj)
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