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# -*- coding: utf-8 -*-
#
# Urwid basic widget classes
# Copyright (C) 2004-2012 Ian Ward
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Urwid web site: http://excess.org/urwid/
from urwid import Edit
from decimal import Decimal
import re
class NumEdit(Edit):
"""NumEdit - edit numerical types
based on the characters in 'allowed' different numerical types
can be edited:
+ regular int: 0123456789
+ regular float: 0123456789.
+ regular oct: 01234567
+ regular hex: 0123456789abcdef
"""
ALLOWED = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
def __init__(self, allowed, caption, default, trimLeadingZeros=True):
super(NumEdit, self).__init__(caption, default)
self._allowed = allowed
self.trimLeadingZeros = trimLeadingZeros
def valid_char(self, ch):
"""
Return true for allowed characters.
"""
return len(ch) == 1 and ch.upper() in self._allowed
def keypress(self, size, key):
"""
Handle editing keystrokes. Remove leading zeros.
>>> e, size = NumEdit("0123456789", u"", "5002"), (10,)
>>> e.keypress(size, 'home')
>>> e.keypress(size, 'delete')
>>> assert e.edit_text == "002"
>>> e.keypress(size, 'end')
>>> assert e.edit_text == "2"
>>> # binary only
>>> e, size = NumEdit("01", u"", ""), (10,)
>>> assert e.edit_text == ""
>>> e.keypress(size, '1')
>>> e.keypress(size, '0')
>>> e.keypress(size, '1')
>>> assert e.edit_text == "101"
"""
(maxcol,) = size
unhandled = Edit.keypress(self, (maxcol,), key)
if not unhandled:
if self.trimLeadingZeros:
# trim leading zeros
while self.edit_pos > 0 and self.edit_text[:1] == "0":
self.set_edit_pos(self.edit_pos - 1)
self.set_edit_text(self.edit_text[1:])
return unhandled
class IntegerEdit(NumEdit):
"""Edit widget for integer values"""
def __init__(self, caption="", default=None, base=10):
"""
caption -- caption markup
default -- default edit value
>>> IntegerEdit(u"", 42)
<IntegerEdit selectable flow widget '42' edit_pos=2>
>>> e, size = IntegerEdit(u"", "5002"), (10,)
>>> e.keypress(size, 'home')
>>> e.keypress(size, 'delete')
>>> assert e.edit_text == "002"
>>> e.keypress(size, 'end')
>>> assert e.edit_text == "2"
>>> e.keypress(size, '9')
>>> e.keypress(size, '0')
>>> assert e.edit_text == "290"
>>> e, size = IntegerEdit("", ""), (10,)
>>> assert e.value() is None
>>> # binary
>>> e, size = IntegerEdit(u"", "1010", base=2), (10,)
>>> e.keypress(size, 'end')
>>> e.keypress(size, '1')
>>> assert e.edit_text == "10101"
>>> assert e.value() == Decimal("21")
>>> # HEX
>>> e, size = IntegerEdit(u"", "10", base=16), (10,)
>>> e.keypress(size, 'end')
>>> e.keypress(size, 'F')
>>> e.keypress(size, 'f')
>>> assert e.edit_text == "10Ff"
>>> assert e.keypress(size, 'G') == 'G' # unhandled key
>>> assert e.edit_text == "10Ff"
>>> # keep leading 0's when not base 10
>>> e, size = IntegerEdit(u"", "10FF", base=16), (10,)
>>> assert e.edit_text == "10FF"
>>> assert e.value() == Decimal("4351")
>>> e.keypress(size, 'home')
>>> e.keypress(size, 'delete')
>>> e.keypress(size, '0')
>>> assert e.edit_text == "00FF"
>>> # test exception on incompatable value for base
>>> e, size = IntegerEdit(u"", "10FG", base=16), (10,)
Traceback (most recent call last):
...
ValueError: invalid value: 10FG for base 16
>>> # test exception on float init value
>>> e, size = IntegerEdit(u"", 10.0), (10,)
Traceback (most recent call last):
...
ValueError: default: Only 'str', 'int', 'long' or Decimal input allowed
>>> e, size = IntegerEdit(u"", Decimal("10.0")), (10,)
Traceback (most recent call last):
...
ValueError: not an 'integer Decimal' instance
"""
self.base = base
val = ""
allowed_chars = self.ALLOWED[:self.base]
if default is not None:
if not isinstance(default, (int, str, Decimal)):
raise ValueError("default: Only 'str', 'int', "
"'long' or Decimal input allowed")
# convert to a long first, this will raise a ValueError
# in case a float is passed or some other error
if isinstance(default, str) and len(default):
# check if it is a valid initial value
validation_re = "^[{}]+$".format(allowed_chars)
if not re.match(validation_re, str(default), re.IGNORECASE):
raise ValueError("invalid value: {} for base {}".format(
default, base))
elif isinstance(default, Decimal):
# a Decimal instance with no fractional part
if default.as_tuple()[2] != 0:
raise ValueError("not an 'integer Decimal' instance")
# convert possible int, long or Decimal to str
val = str(default)
super(IntegerEdit, self).__init__(allowed_chars, caption, val,
trimLeadingZeros=(self.base == 10))
def value(self):
"""
Return the numeric value of self.edit_text.
>>> e, size = IntegerEdit(), (10,)
>>> e.keypress(size, '5')
>>> e.keypress(size, '1')
>>> assert e.value() == 51
"""
if self.edit_text:
return Decimal(int(self.edit_text, self.base))
return None
class FloatEdit(NumEdit):
"""Edit widget for float values."""
def __init__(self, caption="", default=None,
preserveSignificance=True, decimalSeparator='.'):
"""
caption -- caption markup
default -- default edit value
preserveSignificance -- return value has the same signif. as default
decimalSeparator -- use '.' as separator by default, optionally a ','
>>> FloatEdit(u"", "1.065434")
<FloatEdit selectable flow widget '1.065434' edit_pos=8>
>>> e, size = FloatEdit(u"", "1.065434"), (10,)
>>> e.keypress(size, 'home')
>>> e.keypress(size, 'delete')
>>> assert e.edit_text == ".065434"
>>> e.keypress(size, 'end')
>>> e.keypress(size, 'backspace')
>>> assert e.edit_text == ".06543"
>>> e, size = FloatEdit(), (10,)
>>> e.keypress(size, '5')
>>> e.keypress(size, '1')
>>> e.keypress(size, '.')
>>> e.keypress(size, '5')
>>> e.keypress(size, '1')
>>> assert e.value() == Decimal("51.51")
>>> e, size = FloatEdit(decimalSeparator=":"), (10,)
Traceback (most recent call last):
...
ValueError: invalid decimalSeparator: :
>>> e, size = FloatEdit(decimalSeparator=","), (10,)
>>> e.keypress(size, '5')
>>> e.keypress(size, '1')
>>> e.keypress(size, ',')
>>> e.keypress(size, '5')
>>> e.keypress(size, '1')
>>> assert e.edit_text == "51,51"
>>> e, size = FloatEdit("", "3.1415", preserveSignificance=True), (10,)
>>> e.keypress(size, 'end')
>>> e.keypress(size, 'backspace')
>>> e.keypress(size, 'backspace')
>>> assert e.edit_text == "3.14"
>>> assert e.value() == Decimal("3.1400")
>>> e.keypress(size, '1')
>>> e.keypress(size, '5')
>>> e.keypress(size, '9')
>>> assert e.value() == Decimal("3.1416")
>>> e, size = FloatEdit("", ""), (10,)
>>> assert e.value() is None
>>> e, size = FloatEdit(u"", 10.0), (10,)
Traceback (most recent call last):
...
ValueError: default: Only 'str', 'int', 'long' or Decimal input allowed
"""
self.significance = None
self._decimalSeparator = decimalSeparator
if decimalSeparator not in ['.', ',']:
raise ValueError("invalid decimalSeparator: {}".format(
decimalSeparator))
val = ""
if default is not None and default is not "":
if not isinstance(default, (int, str, Decimal)):
raise ValueError("default: Only 'str', 'int', "
"'long' or Decimal input allowed")
if isinstance(default, str) and len(default):
# check if it is a float, raises a ValueError otherwise
float(default)
default = Decimal(default)
if preserveSignificance:
self.significance = abs(default.as_tuple()[2])
val = str(default)
super(FloatEdit, self).__init__(self.ALLOWED[0:10] + decimalSeparator,
caption, val)
def value(self):
"""
Return the numeric value of self.edit_text.
"""
if self.edit_text:
# integer part (before .) and fractional part (after .)
fmt = "{ip}.{fp}"
if self.significance:
# in case of preserved significance, construct the
# format string to fill with trailing 0
fmt = "{{ip}}.{{fp:<0{sig}d}}".format(sig=self.significance)
# get the ip and fp, handles also the case that there is no '.'
ip, fp = ([v for v in
self.edit_text.split(self._decimalSeparator)] + [0])[0:2]
# in case the fp part surpasses the significance we round it
if self.significance and len(str(fp)) > self.significance:
fp = float(fp) / 10**(len(str(fp)) - self.significance)
fp = int(round(fp))
return Decimal(fmt.format(ip=ip, fp=int(fp)))
return None
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