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#
# Copyright 2004 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Radio 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
'''Add support for engineering notation to optparse.OptionParser'''
from copy import copy
from optparse import Option, OptionValueError
scale_factor = {}
scale_factor['E'] = 1e18
scale_factor['P'] = 1e15
scale_factor['T'] = 1e12
scale_factor['G'] = 1e9
scale_factor['M'] = 1e6
scale_factor['k'] = 1e3
scale_factor['m'] = 1e-3
scale_factor['u'] = 1e-6
scale_factor['n'] = 1e-9
scale_factor['p'] = 1e-12
scale_factor['f'] = 1e-15
scale_factor['a'] = 1e-18
def check_eng_float (option, opt, value):
try:
scale = 1.0
suffix = value[-1]
if scale_factor.has_key (suffix):
return float (value[0:-1]) * scale_factor[suffix]
return float (value)
except:
raise OptionValueError (
"option %s: invalid engineering notation value: %r" % (opt, value))
def check_intx (option, opt, value):
try:
return int (value, 0)
except:
raise OptionValueError (
"option %s: invalid integer value: %r" % (opt, value))
def check_subdev (option, opt, value):
"""
Value has the form: (A|B)(:0|1)?
@returns a 2-tuple (0|1, 0|1)
"""
d = { 'A' : (0, 0), 'A:0' : (0, 0), 'A:1' : (0, 1),
'B' : (1, 0), 'B:0' : (1, 0), 'B:1' : (1, 1) }
try:
return d[value.upper()]
except:
raise OptionValueError(
"option %s: invalid subdev: '%r', must be one of A, B, A:0, A:1, B:0, B:1" % (opt, value))
class eng_option (Option):
TYPES = Option.TYPES + ("eng_float", "intx", "subdev")
TYPE_CHECKER = copy (Option.TYPE_CHECKER)
TYPE_CHECKER["eng_float"] = check_eng_float
TYPE_CHECKER["intx"] = check_intx
TYPE_CHECKER["subdev"] = check_subdev
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