Mercurial > cpython-lru_cache-weakref

annotate Lib/cmd.py @ 10123:bc287c6cfa23 legacy-trunk

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Restructured a bit.
author Guido van Rossum <guido@python.org>
date Mon, 08 Feb 1999 22:27:18 +0000
parents e71f83922392
children 52206532d389
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # A generic class to build line-oriented command interpreters
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2 #
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3 # Interpreters constructed with this class obey the following conventions:
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4 #
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5 # 1. End of file on input is processed as the command 'EOF'.
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6 # 2. A command is parsed out of each line by collecting the prefix composed
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7 # of characters in the identchars member.
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8 # 3. A command `foo' is dispatched to a method 'do_foo()'; the do_ method
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9 # is passed a single argument consisting of the remainder of the line.
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10 # 4. Typing an empty line repeats the last command. (Actually, it calls the
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11 # method `emptyline', which may be overridden in a subclass.)
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12 # 5. There is a predefined `help' method. Given an argument `topic', it
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13 # calls the command `help_topic'. With no arguments, it lists all topics
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14 # with defined help_ functions, broken into up to three topics; documented
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15 # commands, miscellaneous help topics, and undocumented commands.
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16 # 6. The command '?' is a synonym for `help'. The command '!' is a synonym
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17 # for `shell', if a do_shell method exists.
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18 #
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19 # The `default' method may be overridden to intercept commands for which there
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20 # is no do_ method.
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21 #
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22 # The data member `self.ruler' sets the character used to draw separator lines
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23 # in the help messages. If empty, no ruler line is drawn. It defaults to "=".
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24 #
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25 # If the value of `self.intro' is nonempty when the cmdloop method is called,
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26 # it is printed out on interpreter startup. This value may be overridden
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27 # via an optional argument to the cmdloop() method.
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28 #
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29 # The data members `self.doc_header', `self.misc_header', and
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30 # `self.undoc_header' set the headers used for the help function's
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31 # listings of documented functions, miscellaneous topics, and undocumented
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32 # functions respectively.
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33 #
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34 # These interpreters use raw_input; thus, if the readline module is loaded,
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35 # they automatically support Emacs-like command history and editing features.
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36 #
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37
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38 import string
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39 import sys
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40 import linecache
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41
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42 PROMPT = '(Cmd) '
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43 IDENTCHARS = string.letters + string.digits + '_'
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44
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45 class Cmd:
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46 prompt = PROMPT
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47 identchars = IDENTCHARS
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48 ruler = '='
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49 lastcmd = ''
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50 cmdqueue = []
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51 intro = None
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52 doc_leader = ""
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53 doc_header = "Documented commands (type help <topic>):"
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54 misc_header = "Miscellaneous help topics:"
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55 undoc_header = "Undocumented commands:"
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56 nohelp = "*** No help on %s"
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57
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58 def __init__(self): pass
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59
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60 def cmdloop(self, intro=None):
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61 self.preloop()
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62 if intro != None:
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63 self.intro = intro
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64 if self.intro:
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65 print self.intro
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66 stop = None
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67 while not stop:
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68 if self.cmdqueue:
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69 line = self.cmdqueue[0]
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70 del self.cmdqueue[0]
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71 else:
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72 try:
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73 line = raw_input(self.prompt)
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74 except EOFError:
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75 line = 'EOF'
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76 line = self.precmd(line)
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77 stop = self.onecmd(line)
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78 stop = self.postcmd(stop, line)
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79 self.postloop()
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80
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81 def precmd(self, line):
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82 return line
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83
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84 def postcmd(self, stop, line):
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85 return stop
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86
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87 def preloop(self):
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88 pass
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89
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90 def postloop(self):
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91 pass
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92
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93 def onecmd(self, line):
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94 line = string.strip(line)
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95 if line == '?':
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96 line = 'help'
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97 elif line == '!':
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98 if hasattr(self, 'do_shell'):
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99 line = 'shell'
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100 else:
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101 return self.default(line)
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102 elif not line:
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103 return self.emptyline()
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104 self.lastcmd = line
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105 i, n = 0, len(line)
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106 while i < n and line[i] in self.identchars: i = i+1
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107 cmd, arg = line[:i], string.strip(line[i:])
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108 if cmd == '':
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109 return self.default(line)
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110 else:
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111 try:
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112 func = getattr(self, 'do_' + cmd)
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113 except AttributeError:
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114 return self.default(line)
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115 return func(arg)
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116
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117 def emptyline(self):
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118 if self.lastcmd:
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119 return self.onecmd(self.lastcmd)
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120
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121 def default(self, line):
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122 print '*** Unknown syntax:', line
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123
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124 def do_help(self, arg):
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125 if arg:
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126 # XXX check arg syntax
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127 try:
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128 func = getattr(self, 'help_' + arg)
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129 except:
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130 print self.nohelp % (arg,)
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131 return
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132 func()
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133 else:
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134 # Inheritance says we have to look in class and
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135 # base classes; order is not important.
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136 names = []
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137 classes = [self.__class__]
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138 while classes:
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139 aclass = classes[0]
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140 if aclass.__bases__:
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141 classes = classes + list(aclass.__bases__)
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142 names = names + dir(aclass)
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143 del classes[0]
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144 cmds_doc = []
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145 cmds_undoc = []
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146 help = {}
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147 for name in names:
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148 if name[:5] == 'help_':
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149 help[name[5:]]=1
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150 names.sort()
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151 # There can be duplicates if routines overridden
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152 prevname = ''
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153 for name in names:
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154 if name[:3] == 'do_':
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155 if name == prevname:
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156 continue
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157 prevname = name
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158 cmd=name[3:]
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159 if help.has_key(cmd):
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160 cmds_doc.append(cmd)
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161 del help[cmd]
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162 else:
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163 cmds_undoc.append(cmd)
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164 print self.doc_leader
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165 self.print_topics(self.doc_header, cmds_doc, 15,80)
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166 self.print_topics(self.misc_header, help.keys(),15,80)
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167 self.print_topics(self.undoc_header, cmds_undoc, 15,80)
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168
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169 def print_topics(self, header, cmds, cmdlen, maxcol):
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170 if cmds:
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171 print header;
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172 if self.ruler:
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173 print self.ruler * len(header)
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174 (cmds_per_line,junk)=divmod(maxcol,cmdlen)
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175 col=cmds_per_line
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176 for cmd in cmds:
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177 if col==0: print
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178 print (("%-"+`cmdlen`+"s") % cmd),
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179 col = (col+1) % cmds_per_line
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180 print "\n"