utils.py
author sylvain.thenault@logilab.fr
Thu, 12 Mar 2009 18:40:24 +0100
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child 1132 96752791c2b6
permissions -rw-r--r--
* turn tidy_html_hook into a regular application hook * use format_fields instead of formatted_attrs method * drop formatted_attrs
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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), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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import locale
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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
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from random import randint, seed
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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)
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    return date
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def date_range(begin, end, incr=1, include=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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    date = begin
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    incr = timedelta(incr, 0, 0)
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    while date <= end:
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        if include is None or include(date): 
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            yield date
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        date += 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(fmt), encoding)
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def make_uid(key):
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    """forge a unique identifier"""
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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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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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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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    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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    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):
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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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        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):
0
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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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            from simplejson import dumps
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            w(u'<script type="text/javascript">\n')
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            for var, value in self.jsvars:
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                w(u'%s = %s;\n' % (var, dumps(value)))
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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, cssfile))
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        # 3/ ie css if necessary
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        if self.ie_cssfiles:
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            w(u'<!--[if lt IE 8]>\n')
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            for cssfile, media in self.ie_cssfiles:
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                w(u'<link rel="stylesheet" type="text/css" media="%s" href="%s"/>\n' %
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                  (media, 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' % 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
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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    HTMLStream uses the (U)StringIO interface to be compliant with
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    existing code.
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    """
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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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    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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class AcceptMixIn(object):
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    """Mixin class for vobjects defining the 'accepts' attribute describing
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    a set of supported entity type (Any by default).
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    """
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    # XXX deprecated, no more necessary
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from logilab.common.deprecation import moved, class_moved
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rql_for_eid = moved('cubicweb.common.uilib', 'rql_for_eid')
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ajax_replace_url = moved('cubicweb.common.uilib', 'ajax_replace_url')
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import cubicweb
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Binary = class_moved(cubicweb.Binary)