Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/click/parser.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 click.parser
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4 ~~~~~~~~~~~~
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5
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6 This module started out as largely a copy paste from the stdlib's
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7 optparse module with the features removed that we do not need from
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8 optparse because we implement them in Click on a higher level (for
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9 instance type handling, help formatting and a lot more).
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10
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11 The plan is to remove more and more from here over time.
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12
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13 The reason this is a different module and not optparse from the stdlib
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14 is that there are differences in 2.x and 3.x about the error messages
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15 generated and optparse in the stdlib uses gettext for no good reason
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16 and might cause us issues.
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17 """
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18 import re
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19 from .exceptions import UsageError, NoSuchOption, BadOptionUsage
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20 from .utils import unpack_args
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21
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22
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23 def _error_args(nargs, opt):
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24 if nargs == 1:
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25 raise BadOptionUsage(opt, '%s option requires an argument' % opt)
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26 raise BadOptionUsage(opt, '%s option requires %d arguments' % (opt, nargs))
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27
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28
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29 def split_opt(opt):
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30 first = opt[:1]
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31 if first.isalnum():
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32 return '', opt
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33 if opt[1:2] == first:
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34 return opt[:2], opt[2:]
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35 return first, opt[1:]
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36
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37
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38 def normalize_opt(opt, ctx):
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39 if ctx is None or ctx.token_normalize_func is None:
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40 return opt
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41 prefix, opt = split_opt(opt)
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42 return prefix + ctx.token_normalize_func(opt)
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43
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44
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45 def split_arg_string(string):
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46 """Given an argument string this attempts to split it into small parts."""
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47 rv = []
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48 for match in re.finditer(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
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49 r'|"([^"\\]*(?:\\.[^"\\]*)*)"'
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50 r'|\S+)\s*', string, re.S):
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51 arg = match.group().strip()
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52 if arg[:1] == arg[-1:] and arg[:1] in '"\'':
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53 arg = arg[1:-1].encode('ascii', 'backslashreplace') \
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54 .decode('unicode-escape')
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55 try:
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56 arg = type(string)(arg)
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57 except UnicodeError:
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58 pass
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59 rv.append(arg)
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60 return rv
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61
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62
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63 class Option(object):
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64
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65 def __init__(self, opts, dest, action=None, nargs=1, const=None, obj=None):
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66 self._short_opts = []
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67 self._long_opts = []
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68 self.prefixes = set()
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69
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70 for opt in opts:
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71 prefix, value = split_opt(opt)
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72 if not prefix:
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73 raise ValueError('Invalid start character for option (%s)'
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74 % opt)
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75 self.prefixes.add(prefix[0])
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76 if len(prefix) == 1 and len(value) == 1:
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77 self._short_opts.append(opt)
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78 else:
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79 self._long_opts.append(opt)
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80 self.prefixes.add(prefix)
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81
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82 if action is None:
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83 action = 'store'
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84
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85 self.dest = dest
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86 self.action = action
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87 self.nargs = nargs
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88 self.const = const
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89 self.obj = obj
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90
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91 @property
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92 def takes_value(self):
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93 return self.action in ('store', 'append')
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94
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95 def process(self, value, state):
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96 if self.action == 'store':
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97 state.opts[self.dest] = value
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98 elif self.action == 'store_const':
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99 state.opts[self.dest] = self.const
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100 elif self.action == 'append':
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101 state.opts.setdefault(self.dest, []).append(value)
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102 elif self.action == 'append_const':
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103 state.opts.setdefault(self.dest, []).append(self.const)
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104 elif self.action == 'count':
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105 state.opts[self.dest] = state.opts.get(self.dest, 0) + 1
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106 else:
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107 raise ValueError('unknown action %r' % self.action)
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108 state.order.append(self.obj)
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109
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110
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111 class Argument(object):
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112
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113 def __init__(self, dest, nargs=1, obj=None):
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114 self.dest = dest
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115 self.nargs = nargs
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116 self.obj = obj
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117
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118 def process(self, value, state):
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119 state.opts[self.dest] = value
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120 state.order.append(self.obj)
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121
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122
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123 class ParsingState(object):
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124
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125 def __init__(self, rargs):
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126 self.opts = {}
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127 self.largs = []
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128 self.rargs = rargs
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129 self.order = []
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130
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131
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132 class OptionParser(object):
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133 """The option parser is an internal class that is ultimately used to
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134 parse options and arguments. It's modelled after optparse and brings
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135 a similar but vastly simplified API. It should generally not be used
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136 directly as the high level Click classes wrap it for you.
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137
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138 It's not nearly as extensible as optparse or argparse as it does not
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139 implement features that are implemented on a higher level (such as
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140 types or defaults).
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141
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142 :param ctx: optionally the :class:`~click.Context` where this parser
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143 should go with.
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144 """
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145
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146 def __init__(self, ctx=None):
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147 #: The :class:`~click.Context` for this parser. This might be
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148 #: `None` for some advanced use cases.
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149 self.ctx = ctx
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150 #: This controls how the parser deals with interspersed arguments.
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151 #: If this is set to `False`, the parser will stop on the first
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152 #: non-option. Click uses this to implement nested subcommands
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153 #: safely.
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154 self.allow_interspersed_args = True
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155 #: This tells the parser how to deal with unknown options. By
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156 #: default it will error out (which is sensible), but there is a
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157 #: second mode where it will ignore it and continue processing
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158 #: after shifting all the unknown options into the resulting args.
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159 self.ignore_unknown_options = False
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160 if ctx is not None:
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161 self.allow_interspersed_args = ctx.allow_interspersed_args
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162 self.ignore_unknown_options = ctx.ignore_unknown_options
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163 self._short_opt = {}
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164 self._long_opt = {}
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165 self._opt_prefixes = set(['-', '--'])
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166 self._args = []
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167
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168 def add_option(self, opts, dest, action=None, nargs=1, const=None,
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169 obj=None):
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170 """Adds a new option named `dest` to the parser. The destination
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171 is not inferred (unlike with optparse) and needs to be explicitly
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172 provided. Action can be any of ``store``, ``store_const``,
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173 ``append``, ``appnd_const`` or ``count``.
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174
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175 The `obj` can be used to identify the option in the order list
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176 that is returned from the parser.
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177 """
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178 if obj is None:
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179 obj = dest
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180 opts = [normalize_opt(opt, self.ctx) for opt in opts]
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181 option = Option(opts, dest, action=action, nargs=nargs,
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182 const=const, obj=obj)
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183 self._opt_prefixes.update(option.prefixes)
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184 for opt in option._short_opts:
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185 self._short_opt[opt] = option
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186 for opt in option._long_opts:
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187 self._long_opt[opt] = option
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188
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189 def add_argument(self, dest, nargs=1, obj=None):
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190 """Adds a positional argument named `dest` to the parser.
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191
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192 The `obj` can be used to identify the option in the order list
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193 that is returned from the parser.
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194 """
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195 if obj is None:
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196 obj = dest
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197 self._args.append(Argument(dest=dest, nargs=nargs, obj=obj))
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198
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199 def parse_args(self, args):
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200 """Parses positional arguments and returns ``(values, args, order)``
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201 for the parsed options and arguments as well as the leftover
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202 arguments if there are any. The order is a list of objects as they
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203 appear on the command line. If arguments appear multiple times they
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204 will be memorized multiple times as well.
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205 """
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206 state = ParsingState(args)
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207 try:
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208 self._process_args_for_options(state)
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209 self._process_args_for_args(state)
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210 except UsageError:
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211 if self.ctx is None or not self.ctx.resilient_parsing:
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212 raise
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213 return state.opts, state.largs, state.order
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214
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215 def _process_args_for_args(self, state):
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216 pargs, args = unpack_args(state.largs + state.rargs,
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217 [x.nargs for x in self._args])
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218
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219 for idx, arg in enumerate(self._args):
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220 arg.process(pargs[idx], state)
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221
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222 state.largs = args
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223 state.rargs = []
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224
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225 def _process_args_for_options(self, state):
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226 while state.rargs:
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227 arg = state.rargs.pop(0)
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228 arglen = len(arg)
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229 # Double dashes always handled explicitly regardless of what
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230 # prefixes are valid.
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231 if arg == '--':
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232 return
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233 elif arg[:1] in self._opt_prefixes and arglen > 1:
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234 self._process_opts(arg, state)
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235 elif self.allow_interspersed_args:
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236 state.largs.append(arg)
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237 else:
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238 state.rargs.insert(0, arg)
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239 return
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240
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241 # Say this is the original argument list:
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242 # [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
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243 # ^
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244 # (we are about to process arg(i)).
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245 #
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246 # Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
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247 # [arg0, ..., arg(i-1)] (any options and their arguments will have
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248 # been removed from largs).
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249 #
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250 # The while loop will usually consume 1 or more arguments per pass.
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251 # If it consumes 1 (eg. arg is an option that takes no arguments),
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252 # then after _process_arg() is done the situation is:
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253 #
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254 # largs = subset of [arg0, ..., arg(i)]
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255 # rargs = [arg(i+1), ..., arg(N-1)]
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256 #
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257 # If allow_interspersed_args is false, largs will always be
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258 # *empty* -- still a subset of [arg0, ..., arg(i-1)], but
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259 # not a very interesting subset!
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260
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261 def _match_long_opt(self, opt, explicit_value, state):
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262 if opt not in self._long_opt:
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263 possibilities = [word for word in self._long_opt
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264 if word.startswith(opt)]
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265 raise NoSuchOption(opt, possibilities=possibilities)
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266
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267 option = self._long_opt[opt]
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268 if option.takes_value:
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269 # At this point it's safe to modify rargs by injecting the
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270 # explicit value, because no exception is raised in this
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271 # branch. This means that the inserted value will be fully
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272 # consumed.
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273 if explicit_value is not None:
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274 state.rargs.insert(0, explicit_value)
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275
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276 nargs = option.nargs
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277 if len(state.rargs) < nargs:
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278 _error_args(nargs, opt)
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279 elif nargs == 1:
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280 value = state.rargs.pop(0)
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281 else:
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282 value = tuple(state.rargs[:nargs])
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283 del state.rargs[:nargs]
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284
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285 elif explicit_value is not None:
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286 raise BadOptionUsage(opt, '%s option does not take a value' % opt)
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287
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288 else:
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289 value = None
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290
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291 option.process(value, state)
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292
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293 def _match_short_opt(self, arg, state):
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294 stop = False
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295 i = 1
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296 prefix = arg[0]
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297 unknown_options = []
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298
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299 for ch in arg[1:]:
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300 opt = normalize_opt(prefix + ch, self.ctx)
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301 option = self._short_opt.get(opt)
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302 i += 1
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303
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304 if not option:
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305 if self.ignore_unknown_options:
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306 unknown_options.append(ch)
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307 continue
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308 raise NoSuchOption(opt)
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309 if option.takes_value:
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310 # Any characters left in arg? Pretend they're the
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311 # next arg, and stop consuming characters of arg.
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312 if i < len(arg):
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313 state.rargs.insert(0, arg[i:])
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314 stop = True
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315
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316 nargs = option.nargs
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317 if len(state.rargs) < nargs:
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318 _error_args(nargs, opt)
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319 elif nargs == 1:
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320 value = state.rargs.pop(0)
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321 else:
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322 value = tuple(state.rargs[:nargs])
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323 del state.rargs[:nargs]
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324
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325 else:
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326 value = None
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327
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328 option.process(value, state)
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329
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330 if stop:
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331 break
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332
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333 # If we got any unknown options we re-combinate the string of the
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334 # remaining options and re-attach the prefix, then report that
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335 # to the state as new larg. This way there is basic combinatorics
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336 # that can be achieved while still ignoring unknown arguments.
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337 if self.ignore_unknown_options and unknown_options:
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338 state.largs.append(prefix + ''.join(unknown_options))
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339
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340 def _process_opts(self, arg, state):
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341 explicit_value = None
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342 # Long option handling happens in two parts. The first part is
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343 # supporting explicitly attached values. In any case, we will try
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344 # to long match the option first.
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345 if '=' in arg:
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346 long_opt, explicit_value = arg.split('=', 1)
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347 else:
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348 long_opt = arg
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349 norm_long_opt = normalize_opt(long_opt, self.ctx)
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350
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351 # At this point we will match the (assumed) long option through
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352 # the long option matching code. Note that this allows options
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353 # like "-foo" to be matched as long options.
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354 try:
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355 self._match_long_opt(norm_long_opt, explicit_value, state)
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356 except NoSuchOption:
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357 # At this point the long option matching failed, and we need
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358 # to try with short options. However there is a special rule
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359 # which says, that if we have a two character options prefix
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360 # (applies to "--foo" for instance), we do not dispatch to the
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361 # short option code and will instead raise the no option
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362 # error.
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363 if arg[:2] not in self._opt_prefixes:
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364 return self._match_short_opt(arg, state)
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365 if not self.ignore_unknown_options:
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366 raise
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367 state.largs.append(arg)