Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/click/parser.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
parents
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0
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1 # -*- coding: utf-8 -*-
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2 """
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3 This module started out as largely a copy paste from the stdlib's
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4 optparse module with the features removed that we do not need from
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5 optparse because we implement them in Click on a higher level (for
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6 instance type handling, help formatting and a lot more).
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7
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8 The plan is to remove more and more from here over time.
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9
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10 The reason this is a different module and not optparse from the stdlib
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11 is that there are differences in 2.x and 3.x about the error messages
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12 generated and optparse in the stdlib uses gettext for no good reason
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13 and might cause us issues.
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14
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15 Click uses parts of optparse written by Gregory P. Ward and maintained
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16 by the Python Software Foundation. This is limited to code in parser.py.
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17
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18 Copyright 2001-2006 Gregory P. Ward. All rights reserved.
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19 Copyright 2002-2006 Python Software Foundation. All rights reserved.
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20 """
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21 import re
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22 from collections import deque
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23
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24 from .exceptions import BadArgumentUsage
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25 from .exceptions import BadOptionUsage
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26 from .exceptions import NoSuchOption
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27 from .exceptions import UsageError
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28
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29
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30 def _unpack_args(args, nargs_spec):
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31 """Given an iterable of arguments and an iterable of nargs specifications,
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32 it returns a tuple with all the unpacked arguments at the first index
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33 and all remaining arguments as the second.
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34
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35 The nargs specification is the number of arguments that should be consumed
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36 or `-1` to indicate that this position should eat up all the remainders.
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37
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38 Missing items are filled with `None`.
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39 """
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40 args = deque(args)
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41 nargs_spec = deque(nargs_spec)
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42 rv = []
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43 spos = None
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44
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45 def _fetch(c):
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46 try:
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47 if spos is None:
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48 return c.popleft()
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49 else:
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50 return c.pop()
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51 except IndexError:
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52 return None
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53
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54 while nargs_spec:
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55 nargs = _fetch(nargs_spec)
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56 if nargs == 1:
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57 rv.append(_fetch(args))
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58 elif nargs > 1:
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59 x = [_fetch(args) for _ in range(nargs)]
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60 # If we're reversed, we're pulling in the arguments in reverse,
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61 # so we need to turn them around.
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62 if spos is not None:
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63 x.reverse()
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64 rv.append(tuple(x))
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65 elif nargs < 0:
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66 if spos is not None:
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67 raise TypeError("Cannot have two nargs < 0")
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68 spos = len(rv)
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69 rv.append(None)
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70
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71 # spos is the position of the wildcard (star). If it's not `None`,
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72 # we fill it with the remainder.
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73 if spos is not None:
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74 rv[spos] = tuple(args)
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75 args = []
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76 rv[spos + 1 :] = reversed(rv[spos + 1 :])
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77
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78 return tuple(rv), list(args)
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79
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80
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81 def _error_opt_args(nargs, opt):
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82 if nargs == 1:
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83 raise BadOptionUsage(opt, "{} option requires an argument".format(opt))
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84 raise BadOptionUsage(opt, "{} option requires {} arguments".format(opt, nargs))
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85
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86
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87 def split_opt(opt):
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88 first = opt[:1]
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89 if first.isalnum():
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90 return "", opt
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91 if opt[1:2] == first:
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92 return opt[:2], opt[2:]
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93 return first, opt[1:]
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94
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95
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96 def normalize_opt(opt, ctx):
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97 if ctx is None or ctx.token_normalize_func is None:
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98 return opt
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99 prefix, opt = split_opt(opt)
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100 return prefix + ctx.token_normalize_func(opt)
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101
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102
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103 def split_arg_string(string):
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104 """Given an argument string this attempts to split it into small parts."""
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105 rv = []
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106 for match in re.finditer(
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107 r"('([^'\\]*(?:\\.[^'\\]*)*)'|\"([^\"\\]*(?:\\.[^\"\\]*)*)\"|\S+)\s*",
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108 string,
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109 re.S,
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110 ):
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111 arg = match.group().strip()
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112 if arg[:1] == arg[-1:] and arg[:1] in "\"'":
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113 arg = arg[1:-1].encode("ascii", "backslashreplace").decode("unicode-escape")
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114 try:
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115 arg = type(string)(arg)
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116 except UnicodeError:
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117 pass
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118 rv.append(arg)
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119 return rv
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120
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121
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122 class Option(object):
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123 def __init__(self, opts, dest, action=None, nargs=1, const=None, obj=None):
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124 self._short_opts = []
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125 self._long_opts = []
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126 self.prefixes = set()
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127
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128 for opt in opts:
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129 prefix, value = split_opt(opt)
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130 if not prefix:
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131 raise ValueError("Invalid start character for option ({})".format(opt))
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132 self.prefixes.add(prefix[0])
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133 if len(prefix) == 1 and len(value) == 1:
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134 self._short_opts.append(opt)
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135 else:
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136 self._long_opts.append(opt)
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137 self.prefixes.add(prefix)
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138
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139 if action is None:
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140 action = "store"
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141
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142 self.dest = dest
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143 self.action = action
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144 self.nargs = nargs
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145 self.const = const
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146 self.obj = obj
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147
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148 @property
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149 def takes_value(self):
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150 return self.action in ("store", "append")
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151
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152 def process(self, value, state):
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153 if self.action == "store":
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154 state.opts[self.dest] = value
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155 elif self.action == "store_const":
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156 state.opts[self.dest] = self.const
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157 elif self.action == "append":
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158 state.opts.setdefault(self.dest, []).append(value)
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159 elif self.action == "append_const":
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160 state.opts.setdefault(self.dest, []).append(self.const)
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161 elif self.action == "count":
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162 state.opts[self.dest] = state.opts.get(self.dest, 0) + 1
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163 else:
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164 raise ValueError("unknown action '{}'".format(self.action))
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165 state.order.append(self.obj)
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166
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167
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168 class Argument(object):
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169 def __init__(self, dest, nargs=1, obj=None):
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170 self.dest = dest
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171 self.nargs = nargs
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172 self.obj = obj
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173
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174 def process(self, value, state):
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175 if self.nargs > 1:
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176 holes = sum(1 for x in value if x is None)
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177 if holes == len(value):
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178 value = None
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179 elif holes != 0:
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180 raise BadArgumentUsage(
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181 "argument {} takes {} values".format(self.dest, self.nargs)
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182 )
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183 state.opts[self.dest] = value
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184 state.order.append(self.obj)
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185
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186
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187 class ParsingState(object):
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188 def __init__(self, rargs):
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189 self.opts = {}
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190 self.largs = []
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191 self.rargs = rargs
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192 self.order = []
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193
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194
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195 class OptionParser(object):
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196 """The option parser is an internal class that is ultimately used to
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197 parse options and arguments. It's modelled after optparse and brings
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198 a similar but vastly simplified API. It should generally not be used
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199 directly as the high level Click classes wrap it for you.
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200
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201 It's not nearly as extensible as optparse or argparse as it does not
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202 implement features that are implemented on a higher level (such as
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203 types or defaults).
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204
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205 :param ctx: optionally the :class:`~click.Context` where this parser
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206 should go with.
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207 """
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208
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209 def __init__(self, ctx=None):
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210 #: The :class:`~click.Context` for this parser. This might be
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211 #: `None` for some advanced use cases.
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212 self.ctx = ctx
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213 #: This controls how the parser deals with interspersed arguments.
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214 #: If this is set to `False`, the parser will stop on the first
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215 #: non-option. Click uses this to implement nested subcommands
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216 #: safely.
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217 self.allow_interspersed_args = True
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218 #: This tells the parser how to deal with unknown options. By
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219 #: default it will error out (which is sensible), but there is a
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220 #: second mode where it will ignore it and continue processing
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221 #: after shifting all the unknown options into the resulting args.
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222 self.ignore_unknown_options = False
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223 if ctx is not None:
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224 self.allow_interspersed_args = ctx.allow_interspersed_args
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225 self.ignore_unknown_options = ctx.ignore_unknown_options
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226 self._short_opt = {}
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227 self._long_opt = {}
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228 self._opt_prefixes = {"-", "--"}
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229 self._args = []
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230
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231 def add_option(self, opts, dest, action=None, nargs=1, const=None, obj=None):
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232 """Adds a new option named `dest` to the parser. The destination
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233 is not inferred (unlike with optparse) and needs to be explicitly
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234 provided. Action can be any of ``store``, ``store_const``,
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235 ``append``, ``appnd_const`` or ``count``.
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236
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237 The `obj` can be used to identify the option in the order list
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238 that is returned from the parser.
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239 """
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240 if obj is None:
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241 obj = dest
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242 opts = [normalize_opt(opt, self.ctx) for opt in opts]
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243 option = Option(opts, dest, action=action, nargs=nargs, const=const, obj=obj)
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244 self._opt_prefixes.update(option.prefixes)
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245 for opt in option._short_opts:
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246 self._short_opt[opt] = option
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247 for opt in option._long_opts:
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248 self._long_opt[opt] = option
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249
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250 def add_argument(self, dest, nargs=1, obj=None):
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251 """Adds a positional argument named `dest` to the parser.
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252
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253 The `obj` can be used to identify the option in the order list
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254 that is returned from the parser.
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255 """
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256 if obj is None:
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257 obj = dest
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258 self._args.append(Argument(dest=dest, nargs=nargs, obj=obj))
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259
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260 def parse_args(self, args):
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261 """Parses positional arguments and returns ``(values, args, order)``
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262 for the parsed options and arguments as well as the leftover
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263 arguments if there are any. The order is a list of objects as they
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264 appear on the command line. If arguments appear multiple times they
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265 will be memorized multiple times as well.
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266 """
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267 state = ParsingState(args)
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268 try:
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269 self._process_args_for_options(state)
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270 self._process_args_for_args(state)
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271 except UsageError:
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272 if self.ctx is None or not self.ctx.resilient_parsing:
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273 raise
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274 return state.opts, state.largs, state.order
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275
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276 def _process_args_for_args(self, state):
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277 pargs, args = _unpack_args(
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278 state.largs + state.rargs, [x.nargs for x in self._args]
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279 )
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280
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281 for idx, arg in enumerate(self._args):
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282 arg.process(pargs[idx], state)
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283
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284 state.largs = args
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285 state.rargs = []
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286
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287 def _process_args_for_options(self, state):
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288 while state.rargs:
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289 arg = state.rargs.pop(0)
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290 arglen = len(arg)
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291 # Double dashes always handled explicitly regardless of what
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292 # prefixes are valid.
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293 if arg == "--":
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294 return
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295 elif arg[:1] in self._opt_prefixes and arglen > 1:
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296 self._process_opts(arg, state)
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297 elif self.allow_interspersed_args:
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298 state.largs.append(arg)
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299 else:
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300 state.rargs.insert(0, arg)
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301 return
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302
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303 # Say this is the original argument list:
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304 # [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
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305 # ^
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306 # (we are about to process arg(i)).
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307 #
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308 # Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
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309 # [arg0, ..., arg(i-1)] (any options and their arguments will have
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310 # been removed from largs).
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311 #
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312 # The while loop will usually consume 1 or more arguments per pass.
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313 # If it consumes 1 (eg. arg is an option that takes no arguments),
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314 # then after _process_arg() is done the situation is:
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315 #
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316 # largs = subset of [arg0, ..., arg(i)]
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317 # rargs = [arg(i+1), ..., arg(N-1)]
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318 #
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319 # If allow_interspersed_args is false, largs will always be
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320 # *empty* -- still a subset of [arg0, ..., arg(i-1)], but
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321 # not a very interesting subset!
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322
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323 def _match_long_opt(self, opt, explicit_value, state):
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324 if opt not in self._long_opt:
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325 possibilities = [word for word in self._long_opt if word.startswith(opt)]
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326 raise NoSuchOption(opt, possibilities=possibilities, ctx=self.ctx)
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327
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328 option = self._long_opt[opt]
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329 if option.takes_value:
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330 # At this point it's safe to modify rargs by injecting the
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331 # explicit value, because no exception is raised in this
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332 # branch. This means that the inserted value will be fully
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333 # consumed.
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334 if explicit_value is not None:
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335 state.rargs.insert(0, explicit_value)
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336
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337 nargs = option.nargs
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338 if len(state.rargs) < nargs:
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339 _error_opt_args(nargs, opt)
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340 elif nargs == 1:
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341 value = state.rargs.pop(0)
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342 else:
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343 value = tuple(state.rargs[:nargs])
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344 del state.rargs[:nargs]
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345
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346 elif explicit_value is not None:
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347 raise BadOptionUsage(opt, "{} option does not take a value".format(opt))
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348
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349 else:
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350 value = None
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351
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352 option.process(value, state)
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353
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354 def _match_short_opt(self, arg, state):
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355 stop = False
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356 i = 1
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357 prefix = arg[0]
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358 unknown_options = []
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359
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360 for ch in arg[1:]:
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361 opt = normalize_opt(prefix + ch, self.ctx)
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362 option = self._short_opt.get(opt)
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363 i += 1
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364
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365 if not option:
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366 if self.ignore_unknown_options:
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367 unknown_options.append(ch)
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368 continue
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369 raise NoSuchOption(opt, ctx=self.ctx)
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370 if option.takes_value:
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371 # Any characters left in arg? Pretend they're the
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372 # next arg, and stop consuming characters of arg.
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373 if i < len(arg):
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374 state.rargs.insert(0, arg[i:])
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375 stop = True
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376
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377 nargs = option.nargs
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378 if len(state.rargs) < nargs:
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379 _error_opt_args(nargs, opt)
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380 elif nargs == 1:
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381 value = state.rargs.pop(0)
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382 else:
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383 value = tuple(state.rargs[:nargs])
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384 del state.rargs[:nargs]
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385
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386 else:
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387 value = None
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388
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389 option.process(value, state)
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390
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391 if stop:
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392 break
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393
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394 # If we got any unknown options we re-combinate the string of the
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395 # remaining options and re-attach the prefix, then report that
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396 # to the state as new larg. This way there is basic combinatorics
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397 # that can be achieved while still ignoring unknown arguments.
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398 if self.ignore_unknown_options and unknown_options:
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399 state.largs.append("{}{}".format(prefix, "".join(unknown_options)))
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400
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401 def _process_opts(self, arg, state):
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402 explicit_value = None
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403 # Long option handling happens in two parts. The first part is
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404 # supporting explicitly attached values. In any case, we will try
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405 # to long match the option first.
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406 if "=" in arg:
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407 long_opt, explicit_value = arg.split("=", 1)
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408 else:
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409 long_opt = arg
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410 norm_long_opt = normalize_opt(long_opt, self.ctx)
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411
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412 # At this point we will match the (assumed) long option through
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413 # the long option matching code. Note that this allows options
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414 # like "-foo" to be matched as long options.
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415 try:
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416 self._match_long_opt(norm_long_opt, explicit_value, state)
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417 except NoSuchOption:
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418 # At this point the long option matching failed, and we need
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419 # to try with short options. However there is a special rule
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420 # which says, that if we have a two character options prefix
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421 # (applies to "--foo" for instance), we do not dispatch to the
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422 # short option code and will instead raise the no option
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423 # error.
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424 if arg[:2] not in self._opt_prefixes:
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425 return self._match_short_opt(arg, state)
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426 if not self.ignore_unknown_options:
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427 raise
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428 state.largs.append(arg)