#

# 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., 59 Temple Place - Suite 330,

# Boston, MA 02111-1307, 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