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annotate pyloader/cast.py @ 6:886009132409

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start a dict for type-based stringcasting
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 12 May 2011 08:23:10 -0700
parents 5ce55f6c8964
children 2261cf505daf
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1 class StringCastException(Exception):
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2 """raised on unsucessful cast"""
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3
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4 class StringCaster(object):
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5 """cast strings to other things"""
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6 # as yet unused
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7
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8 def __init__(self, *casts):
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9 self.casts = casts
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10
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11 def __call__(self, string):
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12 for cast in self.casts:
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13 try:
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14 return cast(string)
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15 except:
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16 continue
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17 return string
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18
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19 ### casters
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20
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21 def str2bool(string):
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22 mapping = {'true': True,
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23 'True': True,
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24 'false': False,
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25 'False': False}
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26 return mapping[string]
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27
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28 def str2list(string, separator=None):
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29 string = string.rstrip(separator)
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30 return [i.strip() for i in string.split(separator)]
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31
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32 def str2args(string, separator=None):
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33 args = str2list(string, separator)
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34 _args = []
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35 kw = {}
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36 for arg in args:
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37 if '=' in arg:
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38 key, value = arg.split('=', 1)
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39 key = key.strip()
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40 value = value.strip()
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41 kw[key] = value
2
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42 else:
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43 _args.append(arg)
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44 return _args, kw
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45
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46 # convenience functions
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47 casts = [int, float, str2bool, str2list, str2args]
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48 cast = StringCaster(*casts)
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49
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50 # cast by type
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51 cast_dict = dict([(i,i) for i in int, float])
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52 cast_dict[bool] = str2bool
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53 cast_dict[tuple] = cast_dict[list] = str2list
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54
2
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55 if __name__ == '__main__':
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56 import sys
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57 for arg in sys.argv[1:]:
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58 print cast(arg)