# ============================================================================
#
# Copyright (C) 2007-2011 Conceptive Engineering bvba. All rights reserved.
# www.conceptive.be / project-camelot@conceptive.be
#
# This file is part of the Camelot Library.
#
# This file may be used under the terms of the GNU General Public
# License version 2.0 as published by the Free Software Foundation
# and appearing in the file license.txt included in the packaging of
# this file. Please review this information to ensure GNU
# General Public Licensing requirements will be met.
#
# If you are unsure which license is appropriate for your use, please
# visit www.python-camelot.com or contact project-camelot@conceptive.be
#
# This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
# WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# For use of this library in commercial applications, please contact
# project-camelot@conceptive.be
#
# ============================================================================
"""Helper functions for the view subpackage"""
from HTMLParser import HTMLParser
from PyQt4 import QtCore
from datetime import datetime, time, date
import re
import logging
import operator
from camelot.core.sql import like_op
from sqlalchemy.sql.operators import between_op
from camelot.core.utils import ugettext
from camelot.core.utils import ugettext_lazy as _
logger = logging.getLogger('camelot.view.utils')
#
# Cached date and time formats, for internal use only
#
_local_date_format = None
_local_datetime_format = None
_local_time_format = None
[docs]def default_language(*args):
"""takes arguments, to be able to use this function as a
default field attribute"""
locale = QtCore.QLocale()
return unicode(locale.name())
[docs]class ParsingError(Exception): pass
[docs]def string_from_string(s):
if not s:
return None
return unicode(s)
[docs]def bool_from_string(s):
if s is None: raise ParsingError()
if s.lower() not in ['false', 'true']: raise ParsingError()
return eval(s.lower().capitalize())
def _insert_string(original, new, pos):
'''Inserts new inside original at pos.'''
return original[:pos] + new + original[pos:]
[docs]def date_from_string(s):
s = s.strip()
if not s:
return None
from PyQt4.QtCore import QDate
import string
f = local_date_format()
dt = QDate.fromString(s, f)
if not dt.isValid():
#
# if there is a mismatch of 1 in length between format and
# string, prepend a 0, to handle the case of 1/11/2011
#
if len(f) == len(s) + 1:
s = '0' + s
dt = QDate.fromString(s, f)
if not dt.isValid():
#
# try alternative separators
#
separators = u''.join([c for c in f if c not in string.ascii_letters])
if separators:
alternative_string = u''.join([(c if c in string.digits else separators[0]) for c in s])
dt = QDate.fromString(alternative_string, f)
if not dt.isValid():
# try parsing without separators
# attention : using non ascii letters will fail on windows
# string.letters then contains non ascii letters of which we don't know the
# encoding, so we cannot convert them to unicode to compare them
only_letters_format = u''.join([c for c in f if c in string.ascii_letters])
only_letters_string = u''.join([c for c in s if c in (string.ascii_letters+string.digits)])
dt = QDate.fromString(only_letters_string, only_letters_format)
if not dt.isValid():
# try parsing without the year, and take the current year by default
only_letters_format = u''.join([c for c in only_letters_format if c not in ['y']])
dt = QDate.fromString(only_letters_string, only_letters_format)
if not dt.isValid():
raise ParsingError()
# # try parsing without year and month, and take the current year and month by default
# only_letters_format = u''.join([c for c in only_letters_format if c not in ['M']])
# dt = QDate.fromString(only_letters_string, only_letters_format)
# if not dt.isValid():
# raise ParsingError()
# else:
# today = date.today()
# return date(today.year, today.month, dt.day())
else:
return date(date.today().year, dt.month(), dt.day())
return date(dt.year(), dt.month(), dt.day())
[docs]def time_from_string(s):
s = s.strip()
if not s:
return None
from PyQt4.QtCore import QTime
f = local_time_format()
tm = QTime.fromString(s, f)
if not tm.isValid():
raise ParsingError()
return time( tm.hour(), tm.minute(), tm.second() )
[docs]def datetime_from_string(s):
s = s.strip()
if not s:
return None
from PyQt4.QtCore import QDateTime
f = local_datetime_format()
dt = QDateTime.fromString(s, f)
if not dt.isValid():
raise ParsingError()
return datetime(dt.date().year(), dt.date().month(), dt.date().day(),
dt.time().hour(), dt.time().minute(), dt.time().second())
[docs]def code_from_string(s, separator):
return s.split(separator)
[docs]def int_from_string(s):
if s is None: raise ParsingError()
if s.isspace(): return int()
s = s.strip()
if len(s) == 0: return int()
try:
i = int(s)
except ValueError:
raise ParsingError()
return i
[docs]def float_from_string(s):
if not s:
return None
locale = QtCore.QLocale()
f, ok = locale.toFloat(s)
if not ok:
raise ParsingError()
return f
[docs]def pyvalue_from_string(pytype, s):
if pytype is str:
return str(s)
elif pytype is unicode:
return unicode(s)
elif pytype is bool:
return bool_from_string(s)
elif pytype is date:
return date_from_string(s)
elif pytype is time:
return date_from_string(s)
elif pytype is datetime:
return datetime_from_string(s)
elif pytype is float:
return float_from_string(s)
elif pytype is int:
return int_from_string(s)
[docs]def enumeration_to_string(value):
return ugettext(unicode(value or u'').replace('_', ' ').capitalize())
operator_names = {
operator.eq : _( u'=' ),
operator.ne : _( u'!=' ),
operator.lt : _( u'<' ),
operator.le : _( u'<=' ),
operator.gt : _( u'>' ),
operator.ge : _( u'>=' ),
like_op : _( u'like' ),
between_op: _( u'between' ),
}
[docs]def text_from_richtext(unstripped_text):
"""funciton that returns a list of lines with escaped data, to be used in templates for example
:arg unstripped_text: string
:return: list of strings
"""
strings = ['']
if not unstripped_text:
return strings
class HtmlToTextParser(HTMLParser):
def handle_endtag(self, tag):
if tag == 'br':
strings.append('')
def handle_data(self, data):
from xml.sax.saxutils import escape
data = data.strip()
if data:
strings.append(escape(data))
parser = HtmlToTextParser()
parser.feed(unstripped_text.strip())
return strings