Source code for camelot.view.utils

#  ============================================================================
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#  Copyright (C) 2007-2011 Conceptive Engineering bvba. All rights reserved.
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"""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 local_date_format(): """Get the local data format and cache it for reuse""" global _local_date_format if not _local_date_format: locale = QtCore.QLocale() format_sequence = re.split('y*', unicode(locale.dateFormat(locale.ShortFormat))) # make sure a year always has 4 numbers format_sequence.insert(-1, 'yyyy') _local_date_format = unicode(u''.join(format_sequence)) return _local_date_format
[docs]def local_datetime_format(): """Get the local datatime format and cache it for reuse""" global _local_datetime_format if not _local_datetime_format: locale = QtCore.QLocale() format_sequence = re.split('y*', unicode(locale.dateTimeFormat(locale.ShortFormat))) # make sure a year always has 4 numbers format_sequence.insert(-1, 'yyyy') _local_datetime_format = unicode(u''.join(format_sequence)) return _local_datetime_format
[docs]def local_time_format(): """Get the local time format and cache it for reuse""" global _local_time_format if not _local_time_format: locale = QtCore.QLocale() _local_time_format = unicode(locale.timeFormat(locale.ShortFormat) ) return _local_time_format
[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

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