utils.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 23 Sep 2009 15:26:47 +0200
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parent 3375 ebb11fa58ab9
child 3890 d7a270f50f54
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add anon user for TestServerConfiguration, no only AppTestConfiguration
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"""Some utilities for CubicWeb server/clients.
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from logilab.mtconverter import xml_escape
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import locale
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import sys
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import decimal
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import datetime as pydatetime
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from md5 import md5
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from datetime import datetime, timedelta, date
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from time import time, mktime
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from random import randint, seed
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from calendar import monthrange
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import decimal
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# initialize random seed from current time
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seed()
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try:
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    strptime = datetime.strptime
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except AttributeError: # py < 2.5
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    from time import strptime as time_strptime
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    def strptime(value, format):
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        return datetime(*time_strptime(value, format)[:6])
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def todate(somedate):
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    """return a date from a date (leaving unchanged) or a datetime"""
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    if isinstance(somedate, datetime):
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        return date(somedate.year, somedate.month, somedate.day)
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    assert isinstance(somedate, date), repr(somedate)
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    return somedate
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def todatetime(somedate):
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    """return a date from a date (leaving unchanged) or a datetime"""
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    # take care, datetime is a subclass of date
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    if isinstance(somedate, datetime):
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        return somedate
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    assert isinstance(somedate, date), repr(somedate)
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    return datetime(somedate.year, somedate.month, somedate.day)
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def datetime2ticks(date):
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    return mktime(date.timetuple()) * 1000
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ONEDAY = timedelta(days=1)
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ONEWEEK = timedelta(days=7)
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def days_in_month(date_):
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    return monthrange(date_.year, date_.month)[1]
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def previous_month(date_, nbmonth=1):
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    while nbmonth:
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        date_ = first_day(date_) - ONEDAY
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        nbmonth -= 1
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    return date_
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def next_month(date_, nbmonth=1):
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    while nbmonth:
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        date_ = last_day(date_) + ONEDAY
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        nbmonth -= 1
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    return date_
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def first_day(date_):
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    return date(date_.year, date_.month, 1)
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def last_day(date_):
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    return date(date_.year, date_.month, days_in_month(date_))
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def date_range(begin, end, incday=None, incmonth=None):
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    """yields each date between begin and end
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    :param begin: the start date
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    :param end: the end date
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    :param incr: the step to use to iterate over dates. Default is
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                 one day.
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    :param include: None (means no exclusion) or a function taking a
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                    date as parameter, and returning True if the date
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                    should be included.
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    """
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    assert not (incday and incmonth)
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    begin = todate(begin)
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    end = todate(end)
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    if incmonth:
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        while begin < end:
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            begin = next_month(begin, incmonth)
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            yield begin
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    else:
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        if not incday:
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            incr = ONEDAY
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        else:
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            incr = timedelta(incday)
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        while begin <= end:
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           yield begin
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           begin += incr
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def ustrftime(date, fmt='%Y-%m-%d'):
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    """like strftime, but returns a unicode string instead of an encoded
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    string which' may be problematic with localized date.
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    encoding is guessed by locale.getpreferredencoding()
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    """
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    # date format may depend on the locale
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    encoding = locale.getpreferredencoding(do_setlocale=False) or 'UTF-8'
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    return unicode(date.strftime(str(fmt)), encoding)
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if sys.version_info[:2] < (2, 5):
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    def make_uid(key):
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        """forge a unique identifier
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        not that unique on win32"""
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        msg = str(key) + "%.10f" % time() + str(randint(0, 1000000))
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        return md5(msg).hexdigest()
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else:
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    from uuid import uuid4
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    def make_uid(key):
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        # remove dash, generated uid are used as identifier sometimes (sql table
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        # names at least)
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        return str(key) + str(uuid4()).replace('-', '')
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def dump_class(cls, clsname):
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    """create copy of a class by creating an empty class inheriting
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    from the given cls.
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    Those class will be used as place holder for attribute and relation
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    description
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    """
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    # type doesn't accept unicode name
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    # return type.__new__(type, str(clsname), (cls,), {})
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    # __autogenerated__ attribute is just a marker
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    return type(str(clsname), (cls,), {'__autogenerated__': True})
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def merge_dicts(dict1, dict2):
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    """update a copy of `dict1` with `dict2`"""
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    dict1 = dict(dict1)
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    dict1.update(dict2)
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    return dict1
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0
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class SizeConstrainedList(list):
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    """simple list that makes sure the list does not get bigger
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    than a given size.
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    when the list is full and a new element is added, the first
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    element of the list is removed before appending the new one
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    >>> l = SizeConstrainedList(2)
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    >>> l.append(1)
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    >>> l.append(2)
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    >>> l
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    [1, 2]
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    >>> l.append(3)
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    [2, 3]
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    """
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    def __init__(self, maxsize):
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        self.maxsize = maxsize
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    def append(self, element):
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        if len(self) == self.maxsize:
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            del self[0]
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        super(SizeConstrainedList, self).append(element)
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    def extend(self, sequence):
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        super(SizeConstrainedList, self).extend(sequence)
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        keepafter = len(self) - self.maxsize
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        if keepafter > 0:
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            del self[:keepafter]
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    __iadd__ = extend
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class UStringIO(list):
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    """a file wrapper which automatically encode unicode string to an encoding
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    specifed in the constructor
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    """
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    def __nonzero__(self):
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        return True
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0
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    def write(self, value):
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        assert isinstance(value, unicode), u"unicode required not %s : %s"\
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                                     % (type(value).__name__, repr(value))
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        self.append(value)
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0
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    def getvalue(self):
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        return u''.join(self)
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    def __repr__(self):
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        return '<%s at %#x>' % (self.__class__.__name__, id(self))
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class HTMLHead(UStringIO):
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    """wraps HTML header's stream
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    Request objects use a HTMLHead instance to ease adding of
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    javascripts and stylesheets
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    """
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    js_unload_code = u'jQuery(window).unload(unloadPageData);'
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    def __init__(self):
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        super(HTMLHead, self).__init__()
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        self.jsvars = []
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        self.jsfiles = []
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        self.cssfiles = []
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        self.ie_cssfiles = []
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        self.post_inlined_scripts = []
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        self.pagedata_unload = False
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    def add_raw(self, rawheader):
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        self.write(rawheader)
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    def define_var(self, var, value):
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        self.jsvars.append( (var, value) )
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    def add_post_inline_script(self, content):
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        self.post_inlined_scripts.append(content)
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    def add_onload(self, jscode, jsoncall=False):
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        if jsoncall:
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            self.add_post_inline_script(u"""jQuery(CubicWeb).bind('ajax-loaded', function(event) {
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%s
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});""" % jscode)
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        else:
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            self.add_post_inline_script(u"""jQuery(document).ready(function () {
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 %s
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 });""" % jscode)
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0
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    def add_js(self, jsfile):
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        """adds `jsfile` to the list of javascripts used in the webpage
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        This function checks if the file has already been added
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        :param jsfile: the script's URL
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        """
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        if jsfile not in self.jsfiles:
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            self.jsfiles.append(jsfile)
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    def add_css(self, cssfile, media):
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        """adds `cssfile` to the list of javascripts used in the webpage
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        This function checks if the file has already been added
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        :param cssfile: the stylesheet's URL
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        """
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        if (cssfile, media) not in self.cssfiles:
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            self.cssfiles.append( (cssfile, media) )
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    def add_ie_css(self, cssfile, media='all'):
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        """registers some IE specific CSS"""
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        if (cssfile, media) not in self.ie_cssfiles:
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            self.ie_cssfiles.append( (cssfile, media) )
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    def add_unload_pagedata(self):
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        """registers onunload callback to clean page data on server"""
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   260
        if not self.pagedata_unload:
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diff changeset
   261
            self.post_inlined_scripts.append(self.js_unload_code)
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   262
            self.pagedata_unload = True
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diff changeset
   263
643
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 28
diff changeset
   264
    def getvalue(self, skiphead=False):
0
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diff changeset
   265
        """reimplement getvalue to provide a consistent (and somewhat browser
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diff changeset
   266
        optimzed cf. http://stevesouders.com/cuzillion) order in external
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parents:
diff changeset
   267
        resources declaration
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parents:
diff changeset
   268
        """
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diff changeset
   269
        w = self.write
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   270
        # 1/ variable declaration if any
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diff changeset
   271
        if self.jsvars:
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Fabrice <fabrice@secondweb.fr>
parents: 2361
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   272
            w(u'<script type="text/javascript"><!--//--><![CDATA[//><!--\n')
0
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   273
            for var, value in self.jsvars:
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   274
                w(u'%s = %s;\n' % (var, dumps(value)))
2554
3b6a6d2f9d7e make jsvars declaration xhtml and html compatible
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diff changeset
   275
            w(u'//--><!]]></script>\n')
0
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parents:
diff changeset
   276
        # 2/ css files
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   277
        for cssfile, media in self.cssfiles:
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diff changeset
   278
            w(u'<link rel="stylesheet" type="text/css" media="%s" href="%s"/>\n' %
3091
c3d73cecb29e [html-head] escape js and css urls
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diff changeset
   279
              (media, xml_escape(cssfile)))
0
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   280
        # 3/ ie css if necessary
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   281
        if self.ie_cssfiles:
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diff changeset
   282
            w(u'<!--[if lt IE 8]>\n')
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parents:
diff changeset
   283
            for cssfile, media in self.ie_cssfiles:
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diff changeset
   284
                w(u'<link rel="stylesheet" type="text/css" media="%s" href="%s"/>\n' %
3091
c3d73cecb29e [html-head] escape js and css urls
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parents: 2678
diff changeset
   285
                  (media, xml_escape(cssfile)))
0
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parents:
diff changeset
   286
            w(u'<![endif]--> \n')
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parents:
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   287
        # 4/ js files
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diff changeset
   288
        for jsfile in self.jsfiles:
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c3d73cecb29e [html-head] escape js and css urls
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 2678
diff changeset
   289
            w(u'<script type="text/javascript" src="%s"></script>\n' %
c3d73cecb29e [html-head] escape js and css urls
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parents: 2678
diff changeset
   290
              xml_escape(jsfile))
0
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parents:
diff changeset
   291
        # 5/ post inlined scripts (i.e. scripts depending on other JS files)
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parents:
diff changeset
   292
        if self.post_inlined_scripts:
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parents:
diff changeset
   293
            w(u'<script type="text/javascript">\n')
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parents:
diff changeset
   294
            w(u'\n\n'.join(self.post_inlined_scripts))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   295
            w(u'\n</script>\n')
643
616191014b8b [jsoncontroller] reorganize _html_exec (used by replacePageChunk) to output required css and js scripts
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 28
diff changeset
   296
        header = super(HTMLHead, self).getvalue()
616191014b8b [jsoncontroller] reorganize _html_exec (used by replacePageChunk) to output required css and js scripts
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 28
diff changeset
   297
        if skiphead:
616191014b8b [jsoncontroller] reorganize _html_exec (used by replacePageChunk) to output required css and js scripts
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 28
diff changeset
   298
            return header
616191014b8b [jsoncontroller] reorganize _html_exec (used by replacePageChunk) to output required css and js scripts
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 28
diff changeset
   299
        return u'<head>\n%s</head>\n' % header
1549
f87561822e27 some basic calendar manipulation functions, delete-trailing-whitespace
sylvain.thenault@logilab.fr
parents: 1397
diff changeset
   300
0
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parents:
diff changeset
   301
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   302
class HTMLStream(object):
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parents:
diff changeset
   303
    """represents a HTML page.
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parents:
diff changeset
   304
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parents:
diff changeset
   305
    This is used my main templates so that HTML headers can be added
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parents:
diff changeset
   306
    at any time during the page generation.
1549
f87561822e27 some basic calendar manipulation functions, delete-trailing-whitespace
sylvain.thenault@logilab.fr
parents: 1397
diff changeset
   307
0
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parents:
diff changeset
   308
    HTMLStream uses the (U)StringIO interface to be compliant with
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   309
    existing code.
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parents:
diff changeset
   310
    """
1549
f87561822e27 some basic calendar manipulation functions, delete-trailing-whitespace
sylvain.thenault@logilab.fr
parents: 1397
diff changeset
   311
0
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parents:
diff changeset
   312
    def __init__(self, req):
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parents:
diff changeset
   313
        # stream for <head>
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parents:
diff changeset
   314
        self.head = req.html_headers
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parents:
diff changeset
   315
        # main stream
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parents:
diff changeset
   316
        self.body = UStringIO()
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parents:
diff changeset
   317
        self.doctype = u''
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   318
        # xmldecl and html opening tag
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   319
        self.xmldecl = u'<?xml version="1.0" encoding="%s"?>\n' % req.encoding
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   320
        self.htmltag = u'<html xmlns="http://www.w3.org/1999/xhtml" ' \
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   321
                       'xmlns:cubicweb="http://www.logilab.org/2008/cubicweb" ' \
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   322
                       'xml:lang="%s" lang="%s">' % (req.lang, req.lang)
3094
978ed8c2c0e4 [googlemap] #344872 set request content-type to text/html
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3091
diff changeset
   323
        # keep main_stream's reference on req for easier text/html demoting
978ed8c2c0e4 [googlemap] #344872 set request content-type to text/html
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3091
diff changeset
   324
        req.main_stream = self
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   325
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   326
    def write(self, data):
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parents:
diff changeset
   327
        """StringIO interface: this method will be assigned to self.w
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parents:
diff changeset
   328
        """
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parents:
diff changeset
   329
        self.body.write(data)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   330
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parents:
diff changeset
   331
    def getvalue(self):
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parents:
diff changeset
   332
        """writes HTML headers, closes </head> tag and writes HTML body"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   333
        return u'%s\n%s\n%s\n%s\n%s\n</html>' % (self.xmldecl, self.doctype,
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   334
                                                 self.htmltag,
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   335
                                                 self.head.getvalue(),
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   336
                                                 self.body.getvalue())
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   337
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   338
2935
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   339
def can_do_pdf_conversion(__answer=[None]):
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   340
    """pdf conversion depends on
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   341
    * pyxmltrf (python package)
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   342
    * fop 0.9x
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   343
    """
2935
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   344
    if __answer[0] is not None:
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   345
        return __answer[0]
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   346
    try:
2936
f35b64718d02 follow name change, fix pdf template registration, add debian package tracking
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2935
diff changeset
   347
        import pysixt
2935
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   348
    except ImportError:
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   349
        __answer[0] = False
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   350
        return False
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   351
    from subprocess import Popen, STDOUT
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   352
    import os
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   353
    try:
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   354
        Popen(['/usr/bin/fop', '-q'],
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   355
              stdout=open(os.devnull, 'w'),
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   356
              stderr=STDOUT)
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   357
    except OSError, e:
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   358
        print e
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   359
        __answer[0] = False
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   360
        return False
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   361
    __answer[0] = True
e06b3eadef31 [views,pdf] minimal support for xhtml->pdf conversion
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 2932
diff changeset
   362
    return True
3231
3ee43e2f8560 [utils] provide a class to extend the default simplejson encoder to be able to dump standard yams attribute types
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3101
diff changeset
   363
3371
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   364
try:
3372
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3371
diff changeset
   365
    # may not be there if cubicweb-web not installed
3371
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   366
    from simplejson import dumps, JSONEncoder
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   367
except ImportError:
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   368
    pass
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   369
else:
3231
3ee43e2f8560 [utils] provide a class to extend the default simplejson encoder to be able to dump standard yams attribute types
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3101
diff changeset
   370
3371
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   371
    class CubicWebJsonEncoder(JSONEncoder):
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   372
        """define a simplejson encoder to be able to encode yams std types"""
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   373
        def default(self, obj):
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   374
            if isinstance(obj, pydatetime.datetime):
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   375
                return obj.strftime('%Y/%m/%d %H:%M:%S')
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   376
            elif isinstance(obj, pydatetime.date):
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   377
                return obj.strftime('%Y/%m/%d')
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   378
            elif isinstance(obj, pydatetime.time):
762a7bc3b73d this has probably be killed by a bad merge...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   379
                return obj.strftime('%H:%M:%S')
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   380
            elif isinstance(obj, decimal.Decimal):
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   381
                return float(obj)
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   382
            try:
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   383
                return JSONEncoder.default(self, obj)
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   384
            except TypeError:
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   385
                # we never ever want to fail because of an unknown type,
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   386
                # just return None in those cases.
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3364
diff changeset
   387
                return None