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annotate flagReader.py @ 60:682588392eaf

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experiments with parsing in lineend
author catherine@Elli.myhome.westell.com
date Fri, 20 Jun 2008 19:52:39 -0400
parents 47af95ad83c7
children
rev   line source
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1 """Defines and parses UNIX-style flags to modify command arguments.
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2
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3 Use of flagReader is DEPRECATED in favor of optparse from the
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4 Python standard library. For backwards compatibility, flagReader
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5 has been re-implemented as a wrapper around optparse.
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6
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7 print flagReader.FlagSet.parse.__doc__ for usage examples.
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8 """
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9
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10 import re, optparse, warnings
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11 warnings.warn("""flagReader has been deprecated. Use optparse instead.""", DeprecationWarning)
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12
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13 class Flag(object):
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14 def __init__(self, name, abbrev=None, nargs=0):
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15 """Flag(name, abbrev=None, nargs=0) : Defines a flag.
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16
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17 name: the full name of the flag (double-dash form)
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18 abbrev: the single-letter abbreviated form of the flag; defaults to
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19 nargs: number of arguments expected after the flag"""
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20
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21 self.name = name
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22 self.abbrev = abbrev or name[0]
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23 self.fullabbrev = '-%s' % (self.abbrev)
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24 self.fullname = '--%s' % (name)
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25 self.nargs = nargs
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26
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27 class FlagSet(object):
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28 def __init__(self, flags):
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29 if not issubclass(type(flags), list):
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30 raise TypeError, 'Argument must be a list'
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31 self.flags = flags
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32 self.lookup = {}
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33 for flag in self.flags:
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34 self.lookup[flag.abbrev] = flag
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35 self.lookup[flag.fullabbrev] = flag
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36 self.lookup[flag.fullname] = flag
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37 self.abbrevPattern = re.compile('^-([%s]+)$' % (''.join(f.abbrev for f in flags)))
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38 def parse(self, arg):
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39 """
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40 Finds flags; returns {flag: (values, if any)} and the remaining argument.
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41
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42 >>> f = FlagSet([Flag('foo'), Flag('bar'), Flag('gimmea', nargs=1)])
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43 >>> f.parse('-fb')
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44 ({'foo': [], 'bar': []}, '')
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45 >>> f.parse('no flags')
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46 ({}, 'no flags')
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47 >>> f.parse('-f blah')
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48 ({'foo': []}, 'blah')
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49 >>> f.parse('--bar')
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50 ({'bar': []}, '')
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51 >>> f.parse('--bar -f')
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52 ({'foo': [], 'bar': []}, '')
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53 >>> f.parse('--notaflag')
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54 ({}, '--notaflag')
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55 >>> f.parse('')
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56 ({}, '')
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57 >>> f.parse('--gimmea bee -f and then some other stuff')
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58 ({'gimmea': ['bee'], 'foo': []}, 'and then some other stuff')
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59 >>> f.parse('hidden -bar')
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60 ({}, 'hidden -bar')
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61 >>> f.parse('-g myarg -b')
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62 ({'gimmea': ['myarg'], 'bar': []}, '')
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63 """
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64 parser = optparse.OptionParser()
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65 for flag in self.flags:
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66 if flag.nargs:
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67 parser.add_option(flag.fullabbrev, flag.fullname, action="store",
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68 type="string", dest=flag.name)
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69 else:
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70 parser.add_option(flag.fullabbrev, flag.fullname, action="store_true",
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71 dest=flag.name)
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72 try:
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73 (options, args) = parser.parse_args(arg.split())
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74 except SystemExit, e:
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75 return {}, arg
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76
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77 result = {}
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78 for (k,v) in options.__dict__.items():
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79 if v == True:
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80 result[k] = []
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81 elif v:
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82 result[k] = [v]
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83 return result, ' '.join(args)
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84
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85 def _test():
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86 import doctest
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87 doctest.testmod()
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88
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89 if __name__ == '__main__':
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90 _test()