utils.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 20 Jul 2010 14:09:58 +0200
branchstable
changeset 5998 6c148645075d
parent 5940 0e3ae19b181a
child 6044 9e48ebd5400c
permissions -rw-r--r--
[js] fix bug encountered with IE (result evaluated to true while no response text -> json parse error)
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Some utilities for CubicWeb server/clients.
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"""
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__docformat__ = "restructuredtext en"
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import os
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import sys
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import decimal
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import datetime
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import random
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from itertools import repeat
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from uuid import uuid4
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from warnings import warn
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ca11228a5268 import cleanup
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from logilab.mtconverter import xml_escape
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from logilab.common.deprecation import deprecated
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_MARKER = object()
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# initialize random seed from current time
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random.seed()
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def make_uid(key=None):
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    """Return a unique identifier string.
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    if specified, `key` is used to prefix the generated uid so it can be used
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    for instance as a DOM id or as sql table names.
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    See uuid.uuid4 documentation for the shape of the generated identifier, but
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    this is basicallly a 32 bits hexadecimal string.
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    """
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    if key is None:
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        return uuid4().hex
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    return str(key) + uuid4().hex
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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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                                       '__doc__': cls.__doc__,
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                                       '__module__': cls.__module__})
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# use networkX instead ?
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# http://networkx.lanl.gov/reference/algorithms.traversal.html#module-networkx.algorithms.traversal.astar
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def transitive_closure_of(entity, relname, _seen=None):
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    """return transitive closure *for the subgraph starting from the given
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    entity* (eg 'parent' entities are not included in the results)
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    """
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    if _seen is None:
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        _seen = set()
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    _seen.add(entity.eid)
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    yield entity
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    for child in getattr(entity, relname):
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        if child.eid in _seen:
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            continue
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        for subchild in transitive_closure_of(child, relname, _seen):
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            yield subchild
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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 RepeatList(object):
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    """fake a list with the same element in each row"""
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    __slots__ = ('_size', '_item')
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    def __init__(self, size, item):
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        self._size = size
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        self._item = item
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    def __repr__(self):
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        return '<cubicweb.utils.RepeatList at %s item=%s size=%s>' % (
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            id(self), self._item, self._size)
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    def __len__(self):
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        return self._size
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    def __nonzero__(self):
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        return self._size
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    def __iter__(self):
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        return repeat(self._item, self._size)
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    def __getitem__(self, index):
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        return self._item
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    def __getslice__(self, i, j):
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        # XXX could be more efficient, but do we bother?
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        return ([self._item] * self._size)[i:j]
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    def __add__(self, other):
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        if isinstance(other, RepeatList):
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            if other._item == self._item:
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                return RepeatList(self._size + other._size, self._item)
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            return ([self._item] * self._size) + other[:]
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        return ([self._item] * self._size) + other
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    def __radd__(self, other):
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        if isinstance(other, RepeatList):
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            if other._item == self._item:
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                return RepeatList(self._size + other._size, self._item)
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            return other[:] + ([self._item] * self._size)
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        return other[:] + ([self._item] * self._size)
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    def __eq__(self, other):
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        if isinstance(other, RepeatList):
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            return other._size == self.size and other._item == self.item
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        return self[:] == other
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    def pop(self, i):
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        self._size -= 1
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0
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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, override=True):
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        """adds a javascript var declaration / assginment in the header
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        :param var: the variable name
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        :param value: the variable value (as a raw python value,
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                      it will be jsonized later)
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        :param override: if False, don't set the variable value if the variable
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                         is already defined. Default is True.
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        """
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        self.jsvars.append( (var, value, override) )
0
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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=_MARKER):
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        if jsoncall is not _MARKER:
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            warn('[3.7] specifying jsoncall is not needed anymore',
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                 DeprecationWarning, stacklevel=2)
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        self.add_post_inline_script(u"""jQuery(CubicWeb).one('server-response', function(event) {
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%s});""" % jscode)
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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', iespec=u'[if lt IE 8]'):
0
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        """registers some IE specific CSS"""
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        if (cssfile, media, iespec) not in self.ie_cssfiles:
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            self.ie_cssfiles.append( (cssfile, media, iespec) )
0
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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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        if not self.pagedata_unload:
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            self.post_inlined_scripts.append(self.js_unload_code)
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            self.pagedata_unload = True
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    def getvalue(self, skiphead=False):
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        """reimplement getvalue to provide a consistent (and somewhat browser
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        optimzed cf. http://stevesouders.com/cuzillion) order in external
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        resources declaration
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        """
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        w = self.write
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        # 1/ variable declaration if any
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        if self.jsvars:
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            w(u'<script type="text/javascript"><!--//--><![CDATA[//><!--\n')
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            for var, value, override in self.jsvars:
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                vardecl = u'%s = %s;' % (var, json.dumps(value))
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                if not override:
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                    vardecl = (u'if (typeof %s == "undefined") {%s}' %
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                               (var, vardecl))
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                w(vardecl + u'\n')
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            w(u'//--><!]]></script>\n')
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        # 2/ css files
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        for cssfile, media in self.cssfiles:
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            w(u'<link rel="stylesheet" type="text/css" media="%s" href="%s"/>\n' %
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              (media, xml_escape(cssfile)))
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        # 3/ ie css if necessary
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        if self.ie_cssfiles:
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            for cssfile, media, iespec in self.ie_cssfiles:
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                w(u'<!--%s>\n' % iespec)
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                w(u'<link rel="stylesheet" type="text/css" media="%s" href="%s"/>\n' %
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                  (media, xml_escape(cssfile)))
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            w(u'<![endif]--> \n')
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        # 4/ js files
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        for jsfile in self.jsfiles:
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            w(u'<script type="text/javascript" src="%s"></script>\n' %
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              xml_escape(jsfile))
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        # 5/ post inlined scripts (i.e. scripts depending on other JS files)
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        if self.post_inlined_scripts:
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            w(u'<script type="text/javascript">\n')
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            w(u'\n\n'.join(self.post_inlined_scripts))
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            w(u'\n</script>\n')
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        header = super(HTMLHead, self).getvalue()
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        if skiphead:
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            return header
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        return u'<head>\n%s</head>\n' % header
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0
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class HTMLStream(object):
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    """represents a HTML page.
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    This is used my main templates so that HTML headers can be added
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    at any time during the page generation.
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0
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    HTMLStream uses the (U)StringIO interface to be compliant with
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    existing code.
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    """
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0
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    def __init__(self, req):
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        # stream for <head>
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        self.head = req.html_headers
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        # main stream
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        self.body = UStringIO()
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        self.doctype = u''
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        # xmldecl and html opening tag
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        self.xmldecl = u'<?xml version="1.0" encoding="%s"?>\n' % req.encoding
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        self.htmltag = u'<html xmlns="http://www.w3.org/1999/xhtml" ' \
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                       'xmlns:cubicweb="http://www.logilab.org/2008/cubicweb" ' \
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                       'xml:lang="%s" lang="%s">' % (req.lang, req.lang)
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        # keep main_stream's reference on req for easier text/html demoting
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        req.main_stream = self
0
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    def write(self, data):
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        """StringIO interface: this method will be assigned to self.w
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        """
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        self.body.write(data)
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    def getvalue(self):
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        """writes HTML headers, closes </head> tag and writes HTML body"""
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        return u'%s\n%s\n%s\n%s\n%s\n</html>' % (self.xmldecl, self.doctype,
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                                                 self.htmltag,
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                                                 self.head.getvalue(),
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                                                 self.body.getvalue())
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try:
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   329
    # may not be there if cubicweb-web not installed
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   330
    if sys.version_info < (2, 6):
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        import simplejson as json
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    else:
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   333
        import json
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   334
except ImportError:
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diff changeset
   335
    json_dumps = None
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diff changeset
   336
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   337
else:
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   338
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    class CubicWebJsonEncoder(json.JSONEncoder):
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84d14ddfae13 [python2.6] prefer python2.6's builtin json module over simplejson
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        """define a json encoder to be able to encode yams std types"""
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848e92bb81cc [json] provide a custom json encoder for entities that includes eid in the json object
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   341
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        def default(self, obj):
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   343
            if hasattr(obj, 'eid'):
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                d = obj.cw_attr_cache.copy()
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                d['eid'] = obj.eid
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   346
                return d
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diff changeset
   347
            if isinstance(obj, datetime.datetime):
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diff changeset
   348
                return obj.strftime('%Y/%m/%d %H:%M:%S')
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diff changeset
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            elif isinstance(obj, datetime.date):
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   350
                return obj.strftime('%Y/%m/%d')
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            elif isinstance(obj, datetime.time):
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   352
                return obj.strftime('%H:%M:%S')
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            elif isinstance(obj, datetime.timedelta):
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diff changeset
   354
                return (obj.days * 24 * 60 * 60) + obj.seconds
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   355
            elif isinstance(obj, decimal.Decimal):
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                return float(obj)
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   357
            try:
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809d3b5b3d31 [python2.6] careful: json-py provides a json package. We don't want that.
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   358
                return json.JSONEncoder.default(self, obj)
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   359
            except TypeError:
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   360
                # we never ever want to fail because of an unknown type,
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   361
                # just return None in those cases.
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diff changeset
   362
                return None
4652
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parents: 4511
diff changeset
   363
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parents: 5883
diff changeset
   364
    def json_dumps(value):
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diff changeset
   365
        return json.dumps(value, cls=CubicWebJsonEncoder)
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parents: 5883
diff changeset
   366
4879
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parents: 4844
diff changeset
   367
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parents: 4844
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   368
@deprecated('[3.7] merge_dicts is deprecated')
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diff changeset
   369
def merge_dicts(dict1, dict2):
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   370
    """update a copy of `dict1` with `dict2`"""
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   371
    dict1 = dict(dict1)
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parents: 4844
diff changeset
   372
    dict1.update(dict2)
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parents: 4844
diff changeset
   373
    return dict1
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parents: 4844
diff changeset
   374
4652
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parents: 4511
diff changeset
   375
from logilab.common import date
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   376
_THIS_MOD_NS = globals()
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parents: 4511
diff changeset
   377
for funcname in ('date_range', 'todate', 'todatetime', 'datetime2ticks',
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   378
                 'days_in_month', 'days_in_year', 'previous_month',
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parents: 4511
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   379
                 'next_month', 'first_day', 'last_day', 'ustrftime',
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parents: 4511
diff changeset
   380
                 'strptime'):
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4511
diff changeset
   381
    msg = '[3.6] %s has been moved to logilab.common.date' % funcname
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parents: 4511
diff changeset
   382
    _THIS_MOD_NS[funcname] = deprecated(msg)(getattr(date, funcname))