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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).

"""

# pylint: disable-msg=C0103

# C0103: Invalid name, since pylint doesn't see that Dump points to a

# function and not a constant

import simplejson

import re

# Check whether the simplejson module supports indentation

_JSON_INDENT = 2

try:

  simplejson.dumps(1, indent=_JSON_INDENT)

except TypeError:

  _JSON_INDENT = None

_RE_EOLSP = re.compile('[ \t]+$', re.MULTILINE)

def DumpJson(data, indent=True):

  """Serialize a given object.

  @param data: the data to serialize

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

  @return: the string representation of data

  """

  if not indent or _JSON_INDENT is None:

    txt = simplejson.dumps(data)

  else:

    txt = simplejson.dumps(data, indent=_JSON_INDENT)

  txt = _RE_EOLSP.sub("", txt)

  if not txt.endswith('\n'):

    txt += '\n'

  return txt

def LoadJson(txt):

  """Unserialize data from a string.

  @param txt: the json-encoded form

  @return: the original data

  """

  return simplejson.loads(txt)

Dump = DumpJson

Load = LoadJson