Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/argcomplete/my_shlex.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # -*- coding: utf-8 -*- |
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2 |
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3 # This copy of shlex.py from Python 3.6 is distributed with argcomplete. |
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4 # It contains only the shlex class, with modifications as noted. |
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5 |
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6 """A lexical analyzer class for simple shell-like syntaxes.""" |
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7 |
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8 # Module and documentation by Eric S. Raymond, 21 Dec 1998 |
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9 # Input stacking and error message cleanup added by ESR, March 2000 |
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10 # push_source() and pop_source() made explicit by ESR, January 2001. |
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11 # Posix compliance, split(), string arguments, and |
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12 # iterator interface by Gustavo Niemeyer, April 2003. |
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13 # changes to tokenize more like Posix shells by Vinay Sajip, July 2016. |
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14 |
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15 import os |
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16 import sys |
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17 from collections import deque |
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18 |
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19 # Modified by argcomplete: 2/3 compatibility |
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20 # Note: cStringIO is not compatible with Unicode |
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21 try: |
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22 from StringIO import StringIO |
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23 except ImportError: |
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24 from io import StringIO |
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25 |
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26 # Modified by argcomplete: 2/3 compatibility |
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27 try: |
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28 basestring |
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29 except NameError: |
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30 basestring = str |
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31 |
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32 class shlex: |
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33 "A lexical analyzer class for simple shell-like syntaxes." |
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34 def __init__(self, instream=None, infile=None, posix=False, |
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35 punctuation_chars=False): |
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36 # Modified by argcomplete: 2/3 compatibility |
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37 if isinstance(instream, basestring): |
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38 instream = StringIO(instream) |
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39 if instream is not None: |
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40 self.instream = instream |
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41 self.infile = infile |
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42 else: |
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43 self.instream = sys.stdin |
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44 self.infile = None |
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45 self.posix = posix |
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46 if posix: |
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47 self.eof = None |
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48 else: |
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49 self.eof = '' |
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50 self.commenters = '#' |
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51 self.wordchars = ('abcdfeghijklmnopqrstuvwxyz' |
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52 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_') |
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53 # Modified by argcomplete: 2/3 compatibility |
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54 # if self.posix: |
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55 # self.wordchars += ('ßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ' |
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56 # 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ') |
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57 self.whitespace = ' \t\r\n' |
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58 self.whitespace_split = False |
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59 self.quotes = '\'"' |
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60 self.escape = '\\' |
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61 self.escapedquotes = '"' |
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62 self.state = ' ' |
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63 self.pushback = deque() |
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64 self.lineno = 1 |
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65 self.debug = 0 |
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66 self.token = '' |
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67 self.filestack = deque() |
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68 self.source = None |
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69 if not punctuation_chars: |
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70 punctuation_chars = '' |
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71 elif punctuation_chars is True: |
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72 punctuation_chars = '();<>|&' |
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73 self.punctuation_chars = punctuation_chars |
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74 if punctuation_chars: |
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75 # _pushback_chars is a push back queue used by lookahead logic |
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76 self._pushback_chars = deque() |
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77 # these chars added because allowed in file names, args, wildcards |
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78 self.wordchars += '~-./*?=' |
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79 #remove any punctuation chars from wordchars |
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80 t = self.wordchars.maketrans(dict.fromkeys(punctuation_chars)) |
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81 self.wordchars = self.wordchars.translate(t) |
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82 |
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83 # Modified by argcomplete: Record last wordbreak position |
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84 self.last_wordbreak_pos = None |
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85 self.wordbreaks = '' |
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86 |
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87 def push_token(self, tok): |
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88 "Push a token onto the stack popped by the get_token method" |
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89 if self.debug >= 1: |
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90 print("shlex: pushing token " + repr(tok)) |
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91 self.pushback.appendleft(tok) |
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92 |
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93 def push_source(self, newstream, newfile=None): |
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94 "Push an input source onto the lexer's input source stack." |
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95 # Modified by argcomplete: 2/3 compatibility |
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96 if isinstance(newstream, basestring): |
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97 newstream = StringIO(newstream) |
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98 self.filestack.appendleft((self.infile, self.instream, self.lineno)) |
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99 self.infile = newfile |
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100 self.instream = newstream |
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101 self.lineno = 1 |
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102 if self.debug: |
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103 if newfile is not None: |
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104 print('shlex: pushing to file %s' % (self.infile,)) |
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105 else: |
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106 print('shlex: pushing to stream %s' % (self.instream,)) |
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107 |
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108 def pop_source(self): |
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109 "Pop the input source stack." |
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110 self.instream.close() |
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111 (self.infile, self.instream, self.lineno) = self.filestack.popleft() |
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112 if self.debug: |
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113 print('shlex: popping to %s, line %d' \ |
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114 % (self.instream, self.lineno)) |
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115 self.state = ' ' |
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116 |
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117 def get_token(self): |
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118 "Get a token from the input stream (or from stack if it's nonempty)" |
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119 if self.pushback: |
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120 tok = self.pushback.popleft() |
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121 if self.debug >= 1: |
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122 print("shlex: popping token " + repr(tok)) |
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123 return tok |
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124 # No pushback. Get a token. |
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125 raw = self.read_token() |
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126 # Handle inclusions |
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127 if self.source is not None: |
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128 while raw == self.source: |
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129 spec = self.sourcehook(self.read_token()) |
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130 if spec: |
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131 (newfile, newstream) = spec |
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132 self.push_source(newstream, newfile) |
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133 raw = self.get_token() |
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134 # Maybe we got EOF instead? |
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135 while raw == self.eof: |
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136 if not self.filestack: |
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137 return self.eof |
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138 else: |
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139 self.pop_source() |
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140 raw = self.get_token() |
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141 # Neither inclusion nor EOF |
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142 if self.debug >= 1: |
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143 if raw != self.eof: |
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144 print("shlex: token=" + repr(raw)) |
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145 else: |
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146 print("shlex: token=EOF") |
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147 return raw |
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148 |
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149 def read_token(self): |
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150 quoted = False |
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151 escapedstate = ' ' |
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152 while True: |
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153 if self.punctuation_chars and self._pushback_chars: |
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154 nextchar = self._pushback_chars.pop() |
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155 else: |
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156 nextchar = self.instream.read(1) |
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157 if nextchar == '\n': |
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158 self.lineno += 1 |
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159 if self.debug >= 3: |
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160 print("shlex: in state %r I see character: %r" % (self.state, |
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161 nextchar)) |
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162 if self.state is None: |
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163 self.token = '' # past end of file |
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164 break |
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165 elif self.state == ' ': |
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166 if not nextchar: |
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167 self.state = None # end of file |
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168 break |
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169 elif nextchar in self.whitespace: |
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170 if self.debug >= 2: |
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171 print("shlex: I see whitespace in whitespace state") |
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172 if self.token or (self.posix and quoted): |
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173 break # emit current token |
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174 else: |
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175 continue |
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176 elif nextchar in self.commenters: |
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177 self.instream.readline() |
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178 self.lineno += 1 |
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179 elif self.posix and nextchar in self.escape: |
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180 escapedstate = 'a' |
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181 self.state = nextchar |
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182 elif nextchar in self.wordchars: |
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183 self.token = nextchar |
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184 self.state = 'a' |
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185 elif nextchar in self.punctuation_chars: |
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186 self.token = nextchar |
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187 self.state = 'c' |
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188 elif nextchar in self.quotes: |
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189 if not self.posix: |
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190 self.token = nextchar |
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191 self.state = nextchar |
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192 elif self.whitespace_split: |
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193 self.token = nextchar |
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194 self.state = 'a' |
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195 else: |
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196 self.token = nextchar |
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197 if self.token or (self.posix and quoted): |
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198 break # emit current token |
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199 else: |
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200 continue |
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201 elif self.state in self.quotes: |
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202 quoted = True |
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203 if not nextchar: # end of file |
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204 if self.debug >= 2: |
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205 print("shlex: I see EOF in quotes state") |
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206 # XXX what error should be raised here? |
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207 raise ValueError("No closing quotation") |
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208 if nextchar == self.state: |
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209 if not self.posix: |
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210 self.token += nextchar |
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211 self.state = ' ' |
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212 break |
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213 else: |
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214 self.state = 'a' |
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215 elif (self.posix and nextchar in self.escape and self.state |
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216 in self.escapedquotes): |
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217 escapedstate = self.state |
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218 self.state = nextchar |
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219 else: |
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220 self.token += nextchar |
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221 elif self.state in self.escape: |
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222 if not nextchar: # end of file |
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223 if self.debug >= 2: |
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224 print("shlex: I see EOF in escape state") |
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225 # XXX what error should be raised here? |
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226 raise ValueError("No escaped character") |
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227 # In posix shells, only the quote itself or the escape |
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228 # character may be escaped within quotes. |
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229 if (escapedstate in self.quotes and |
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230 nextchar != self.state and nextchar != escapedstate): |
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231 self.token += self.state |
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232 self.token += nextchar |
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233 self.state = escapedstate |
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234 elif self.state in ('a', 'c'): |
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235 if not nextchar: |
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236 self.state = None # end of file |
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237 break |
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238 elif nextchar in self.whitespace: |
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239 if self.debug >= 2: |
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240 print("shlex: I see whitespace in word state") |
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241 self.state = ' ' |
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242 if self.token or (self.posix and quoted): |
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243 break # emit current token |
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244 else: |
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245 continue |
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246 elif nextchar in self.commenters: |
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247 self.instream.readline() |
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248 self.lineno += 1 |
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249 if self.posix: |
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250 self.state = ' ' |
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251 if self.token or (self.posix and quoted): |
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252 break # emit current token |
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253 else: |
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254 continue |
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255 elif self.posix and nextchar in self.quotes: |
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256 self.state = nextchar |
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257 elif self.posix and nextchar in self.escape: |
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258 escapedstate = 'a' |
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259 self.state = nextchar |
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260 elif self.state == 'c': |
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261 if nextchar in self.punctuation_chars: |
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262 self.token += nextchar |
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263 else: |
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264 if nextchar not in self.whitespace: |
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265 self._pushback_chars.append(nextchar) |
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266 self.state = ' ' |
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267 break |
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268 elif (nextchar in self.wordchars or nextchar in self.quotes |
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269 or self.whitespace_split): |
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270 self.token += nextchar |
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271 # Modified by argcomplete: Record last wordbreak position |
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272 if nextchar in self.wordbreaks: |
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273 self.last_wordbreak_pos = len(self.token) - 1 |
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274 else: |
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275 if self.punctuation_chars: |
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276 self._pushback_chars.append(nextchar) |
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277 else: |
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278 self.pushback.appendleft(nextchar) |
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279 if self.debug >= 2: |
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280 print("shlex: I see punctuation in word state") |
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281 self.state = ' ' |
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282 if self.token or (self.posix and quoted): |
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283 break # emit current token |
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284 else: |
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285 continue |
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286 result = self.token |
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287 self.token = '' |
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288 if self.posix and not quoted and result == '': |
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289 result = None |
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290 if self.debug > 1: |
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291 if result: |
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292 print("shlex: raw token=" + repr(result)) |
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293 else: |
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294 print("shlex: raw token=EOF") |
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295 # Modified by argcomplete: Record last wordbreak position |
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296 if self.state == ' ': |
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297 self.last_wordbreak_pos = None |
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298 return result |
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299 |
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300 def sourcehook(self, newfile): |
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301 "Hook called on a filename to be sourced." |
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302 if newfile[0] == '"': |
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303 newfile = newfile[1:-1] |
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304 # This implements cpp-like semantics for relative-path inclusion. |
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305 # Modified by argcomplete: 2/3 compatibility |
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306 if isinstance(self.infile, basestring) and not os.path.isabs(newfile): |
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307 newfile = os.path.join(os.path.dirname(self.infile), newfile) |
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308 return (newfile, open(newfile, "r")) |
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309 |
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310 def error_leader(self, infile=None, lineno=None): |
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311 "Emit a C-compiler-like, Emacs-friendly error-message leader." |
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312 if infile is None: |
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313 infile = self.infile |
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314 if lineno is None: |
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315 lineno = self.lineno |
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316 return "\"%s\", line %d: " % (infile, lineno) |
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317 |
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318 def __iter__(self): |
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319 return self |
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320 |
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321 def __next__(self): |
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322 token = self.get_token() |
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323 if token == self.eof: |
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324 raise StopIteration |
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325 return token |
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326 |
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327 # Modified by argcomplete: 2/3 compatibility |
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328 next = __next__ |