serializer.py 1.87 KB
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#
#

# Copyright (C) 2007, 2008 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

"""Serializer abstraction module

This module introduces a simple abstraction over the serialization
backend (currently json).

"""
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# pylint: disable-msg=C0103

# C0103: Invalid name, since pylint doesn't see that Dump points to a
# function and not a constant
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import simplejson
import re

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# Check whether the simplejson module supports indentation
_JSON_INDENT = 2
try:
  simplejson.dumps(1, indent=_JSON_INDENT)
except TypeError:
  _JSON_INDENT = None

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_RE_EOLSP = re.compile('[ \t]+$', re.MULTILINE)
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def DumpJson(data, indent=True):
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  """Serialize a given object.

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  @param data: the data to serialize
  @param indent: whether to indent output (depends on simplejson version)

  @return: the string representation of data
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  """
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  if not indent or _JSON_INDENT is None:
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    txt = simplejson.dumps(data)
  else:
    txt = simplejson.dumps(data, indent=_JSON_INDENT)
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  txt = _RE_EOLSP.sub("", txt)
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  if not txt.endswith('\n'):
    txt += '\n'
  return txt


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def LoadJson(txt):
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  """Unserialize data from a string.

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  @param txt: the json-encoded form

  @return: the original data

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  """
  return simplejson.loads(txt)
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Dump = DumpJson
Load = LoadJson