Mercurial > cpython-lru_cache-weakref
annotate Lib/cmd.py @ 25838:8540887bcec6 2.2
Backport of 2.183:
Fix memory leak in add_subclass() found by NealN with valgrind.
| author | Guido van Rossum <guido@python.org> |
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| date | Fri, 18 Oct 2002 13:42:21 +0000 |
| parents | 668c5ca4e0d4 |
| children | 0a6b88190b8b |
| 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 7. If completion is enabled, completing commands will be done automatically, |
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19 and completing of commands args is done by calling complete_foo() with |
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20 arguments text, line, begidx, endidx. text is string we are matching |
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21 against, all returned matches must begin with it. line is the current |
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22 input line (lstripped), begidx and endidx are the beginning and end |
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23 indexes of the text being matched, which could be used to provide |
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24 different completion depending upon which position the argument is in. |
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25 |
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26 The `default' method may be overridden to intercept commands for which there |
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27 is no do_ method. |
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28 |
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29 The `completedefault' method may be overridden to intercept completions for |
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30 commands that have no complete_ method. |
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31 |
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32 The data member `self.ruler' sets the character used to draw separator lines |
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33 in the help messages. If empty, no ruler line is drawn. It defaults to "=". |
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34 |
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35 If the value of `self.intro' is nonempty when the cmdloop method is called, |
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36 it is printed out on interpreter startup. This value may be overridden |
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37 via an optional argument to the cmdloop() method. |
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38 |
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39 The data members `self.doc_header', `self.misc_header', and |
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40 `self.undoc_header' set the headers used for the help function's |
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41 listings of documented functions, miscellaneous topics, and undocumented |
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42 functions respectively. |
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43 |
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44 These interpreters use raw_input; thus, if the readline module is loaded, |
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45 they automatically support Emacs-like command history and editing features. |
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46 """ |
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48 import string, sys |
| 624 | 49 |
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50 __all__ = ["Cmd"] |
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51 |
| 624 | 52 PROMPT = '(Cmd) ' |
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53 IDENTCHARS = string.ascii_letters + string.digits + '_' |
| 624 | 54 |
| 55 class Cmd: | |
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56 """A simple framework for writing line-oriented command interpreters. |
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57 |
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58 These are often useful for test harnesses, administrative tools, and |
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59 prototypes that will later be wrapped in a more sophisticated interface. |
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60 |
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61 A Cmd instance or subclass instance is a line-oriented interpreter |
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62 framework. There is no good reason to instantiate Cmd itself; rather, |
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63 it's useful as a superclass of an interpreter class you define yourself |
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64 in order to inherit Cmd's methods and encapsulate action methods. |
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65 |
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66 """ |
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67 prompt = PROMPT |
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68 identchars = IDENTCHARS |
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69 ruler = '=' |
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70 lastcmd = '' |
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71 cmdqueue = [] |
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72 intro = None |
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73 doc_leader = "" |
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74 doc_header = "Documented commands (type help <topic>):" |
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75 misc_header = "Miscellaneous help topics:" |
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76 undoc_header = "Undocumented commands:" |
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77 nohelp = "*** No help on %s" |
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78 use_rawinput = 1 |
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79 |
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80 def __init__(self, completekey='tab'): |
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81 """Instantiate a line-oriented interpreter framework. |
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82 |
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83 The optional argument is the readline name of a completion key; |
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84 it defaults to the Tab key. If completekey is not None and the |
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85 readline module is available, command completion is done |
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86 automatically. |
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87 |
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88 """ |
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89 if completekey: |
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90 try: |
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91 import readline |
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92 readline.set_completer(self.complete) |
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93 readline.parse_and_bind(completekey+": complete") |
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94 except ImportError: |
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95 pass |
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96 |
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97 def cmdloop(self, intro=None): |
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98 """Repeatedly issue a prompt, accept input, parse an initial prefix |
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99 off the received input, and dispatch to action methods, passing them |
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100 the remainder of the line as argument. |
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101 |
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102 """ |
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103 |
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104 self.preloop() |
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105 if intro is not None: |
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106 self.intro = intro |
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107 if self.intro: |
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108 print self.intro |
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109 stop = None |
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110 while not stop: |
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111 if self.cmdqueue: |
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112 line = self.cmdqueue[0] |
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113 del self.cmdqueue[0] |
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114 else: |
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115 if self.use_rawinput: |
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116 try: |
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117 line = raw_input(self.prompt) |
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118 except EOFError: |
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119 line = 'EOF' |
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120 else: |
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121 sys.stdout.write(self.prompt) |
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122 sys.stdout.flush() |
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123 line = sys.stdin.readline() |
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124 if not len(line): |
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125 line = 'EOF' |
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126 else: |
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127 line = line[:-1] # chop \n |
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128 line = self.precmd(line) |
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129 stop = self.onecmd(line) |
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130 stop = self.postcmd(stop, line) |
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131 self.postloop() |
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132 |
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133 def precmd(self, line): |
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134 """Hook method executed just before the command line is |
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135 interpreted, but after the input prompt is generated and issued. |
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136 |
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137 """ |
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138 return line |
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139 |
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140 def postcmd(self, stop, line): |
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141 """Hook method executed just after a command dispatch is finished.""" |
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142 return stop |
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143 |
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144 def preloop(self): |
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145 """Hook method executed once when the cmdloop() method is called.""" |
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146 pass |
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147 |
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148 def postloop(self): |
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149 """Hook method executed once when the cmdloop() method is about to |
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150 return. |
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151 |
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152 """ |
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153 pass |
| 624 | 154 |
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155 def parseline(self, line): |
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156 line = line.strip() |
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157 if not line: |
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158 return None, None, line |
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159 elif line[0] == '?': |
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160 line = 'help ' + line[1:] |
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161 elif line[0] == '!': |
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162 if hasattr(self, 'do_shell'): |
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163 line = 'shell ' + line[1:] |
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164 else: |
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165 return None, None, line |
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166 i, n = 0, len(line) |
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167 while i < n and line[i] in self.identchars: i = i+1 |
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168 cmd, arg = line[:i], line[i:].strip() |
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169 return cmd, arg, line |
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170 |
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171 def onecmd(self, line): |
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172 """Interpret the argument as though it had been typed in response |
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173 to the prompt. |
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174 |
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175 This may be overridden, but should not normally need to be; |
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176 see the precmd() and postcmd() methods for useful execution hooks. |
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177 The return value is a flag indicating whether interpretation of |
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178 commands by the interpreter should stop. |
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179 |
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180 """ |
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181 cmd, arg, line = self.parseline(line) |
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182 if not line: |
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183 return self.emptyline() |
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184 if cmd is None: |
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185 return self.default(line) |
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186 self.lastcmd = line |
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187 if cmd == '': |
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188 return self.default(line) |
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189 else: |
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190 try: |
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191 func = getattr(self, 'do_' + cmd) |
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192 except AttributeError: |
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193 return self.default(line) |
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194 return func(arg) |
| 624 | 195 |
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196 def emptyline(self): |
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197 """Called when an empty line is entered in response to the prompt. |
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198 |
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199 If this method is not overridden, it repeats the last nonempty |
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200 command entered. |
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201 |
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202 """ |
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203 if self.lastcmd: |
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204 return self.onecmd(self.lastcmd) |
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205 |
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206 def default(self, line): |
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207 """Called on an input line when the command prefix is not recognized. |
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208 |
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209 If this method is not overridden, it prints an error message and |
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210 returns. |
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211 |
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212 """ |
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213 print '*** Unknown syntax:', line |
| 624 | 214 |
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215 def completedefault(self, *ignored): |
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216 """Method called to complete an input line when no command-specific |
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217 complete_*() method is available. |
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218 |
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219 By default, it returns an empty list. |
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220 |
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221 """ |
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222 return [] |
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223 |
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224 def completenames(self, text, *ignored): |
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225 dotext = 'do_'+text |
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226 return [a[3:] for a in self.get_names() if a.startswith(dotext)] |
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227 |
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228 def complete(self, text, state): |
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229 """Return the next possible completion for 'text'. |
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230 |
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231 If a command has not been entered, then complete against command list. |
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232 Otherwise try to call complete_<command> to get list of completions. |
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233 """ |
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234 if state == 0: |
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235 import readline |
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236 origline = readline.get_line_buffer() |
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237 line = origline.lstrip() |
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238 stripped = len(origline) - len(line) |
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239 begidx = readline.get_begidx() - stripped |
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240 endidx = readline.get_endidx() - stripped |
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241 if begidx>0: |
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242 cmd, args, foo = self.parseline(line) |
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243 if cmd == '': |
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244 compfunc = self.completedefault |
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245 else: |
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246 try: |
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247 compfunc = getattr(self, 'complete_' + cmd) |
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248 except AttributeError: |
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249 compfunc = self.completedefault |
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250 else: |
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251 compfunc = self.completenames |
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252 self.completion_matches = compfunc(text, line, begidx, endidx) |
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253 try: |
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254 return self.completion_matches[state] |
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255 except IndexError: |
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256 return None |
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257 |
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258 def get_names(self): |
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259 # Inheritance says we have to look in class and |
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260 # base classes; order is not important. |
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261 names = [] |
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262 classes = [self.__class__] |
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263 while classes: |
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264 aclass = classes[0] |
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265 if aclass.__bases__: |
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266 classes = classes + list(aclass.__bases__) |
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267 names = names + dir(aclass) |
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268 del classes[0] |
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269 return names |
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270 |
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271 def complete_help(self, *args): |
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272 return self.completenames(*args) |
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273 |
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274 def do_help(self, arg): |
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275 if arg: |
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276 # XXX check arg syntax |
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277 try: |
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278 func = getattr(self, 'help_' + arg) |
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279 except: |
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280 try: |
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281 doc=getattr(self, 'do_' + arg).__doc__ |
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282 if doc: |
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283 print doc |
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284 return |
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285 except: |
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286 pass |
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287 print self.nohelp % (arg,) |
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288 return |
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289 func() |
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290 else: |
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291 names = self.get_names() |
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292 cmds_doc = [] |
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293 cmds_undoc = [] |
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294 help = {} |
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295 for name in names: |
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296 if name[:5] == 'help_': |
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297 help[name[5:]]=1 |
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298 names.sort() |
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299 # There can be duplicates if routines overridden |
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300 prevname = '' |
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301 for name in names: |
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302 if name[:3] == 'do_': |
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303 if name == prevname: |
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304 continue |
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305 prevname = name |
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306 cmd=name[3:] |
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307 if help.has_key(cmd): |
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308 cmds_doc.append(cmd) |
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309 del help[cmd] |
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310 elif getattr(self, name).__doc__: |
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311 cmds_doc.append(cmd) |
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312 else: |
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313 cmds_undoc.append(cmd) |
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314 print self.doc_leader |
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315 self.print_topics(self.doc_header, cmds_doc, 15,80) |
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316 self.print_topics(self.misc_header, help.keys(),15,80) |
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317 self.print_topics(self.undoc_header, cmds_undoc, 15,80) |
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318 |
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319 def print_topics(self, header, cmds, cmdlen, maxcol): |
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320 if cmds: |
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321 print header |
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322 if self.ruler: |
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323 print self.ruler * len(header) |
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324 (cmds_per_line,junk)=divmod(maxcol,cmdlen) |
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325 col=cmds_per_line |
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326 for cmd in cmds: |
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327 if col==0: print |
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328 print (("%-"+`cmdlen`+"s") % cmd), |
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329 col = (col+1) % cmds_per_line |
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330 print "\n" |
