Mercurial > cpython-lru_cache-weakref

annotate Lib/mailbox.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 772828c1b1f6
children 73758db2f464
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/local/bin/python
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2
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3 """Classes to handle Unix style, MMDF style, and MH style mailboxes."""
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4
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5
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6 import rfc822
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7 import os
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8 import regex
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9
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10 class _Mailbox:
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11 def __init__(self, fp):
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12 self.fp = fp
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13 self.seekp = 0
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14
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15 def seek(self, pos, whence=0):
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16 if whence==1: # Relative to current position
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17 self.pos = self.pos + pos
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18 if whence==2: # Relative to file's end
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19 self.pos = self.stop + pos
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20 else: # Default - absolute position
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21 self.pos = self.start + pos
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22
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23 def next(self):
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24 while 1:
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25 self.fp.seek(self.seekp)
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26 try:
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27 self._search_start()
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28 except EOFError:
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29 self.seekp = self.fp.tell()
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30 return None
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31 start = self.fp.tell()
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32 self._search_end()
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33 self.seekp = stop = self.fp.tell()
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34 if start <> stop:
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35 break
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36 return rfc822.Message(_Subfile(self.fp, start, stop))
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37
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38 class _Subfile:
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39 def __init__(self, fp, start, stop):
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40 self.fp = fp
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41 self.start = start
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42 self.stop = stop
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43 self.pos = self.start
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44
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45 def read(self, length = None):
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46 if self.pos >= self.stop:
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47 return ''
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48 if length is None:
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49 length = self.stop - self.pos
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50 self.fp.seek(self.pos)
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51 self.pos = self.pos + length
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52 return self.fp.read(length)
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53
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54 def readline(self, length = None):
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55 if self.pos >= self.stop:
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56 return ''
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57 if length is None:
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58 length = self.stop - self.pos
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59 self.fp.seek(self.pos)
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60 data = self.fp.readline(length)
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61 if len(data) < length:
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62 length = len(data)
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63 self.pos = self.pos + length
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64 return data
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65
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66 def tell(self):
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67 return self.pos - self.start
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68
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69 def seek(self, pos, whence=0):
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70 if whence == 0:
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71 self.pos = self.start + pos
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72 elif whence == 1:
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73 self.pos = self.pos + pos
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74 elif whence == 2:
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75 self.pos = self.stop + pos
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76
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77 def close(self):
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78 pass
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79
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80 class UnixMailbox(_Mailbox):
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81 def _search_start(self):
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82 while 1:
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83 line = self.fp.readline()
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84 if not line:
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85 raise EOFError
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86 if line[:5] == 'From ':
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87 return
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88
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89 def _search_end(self):
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90 while 1:
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91 pos = self.fp.tell()
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92 line = self.fp.readline()
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93 if not line:
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94 return
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95 if line[:5] == 'From ':
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96 self.fp.seek(pos)
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97 return
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98
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99 class MmdfMailbox(_Mailbox):
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100 def _search_start(self):
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101 while 1:
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102 line = self.fp.readline()
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103 if not line:
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104 raise EOFError
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105 if line[:5] == '\001\001\001\001\n':
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106 return
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107
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108 def _search_end(self):
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109 while 1:
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110 pos = self.fp.tell()
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111 line = self.fp.readline()
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112 if not line:
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113 return
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114 if line == '\001\001\001\001\n':
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115 self.fp.seek(pos)
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116 return
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117
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118 class MHMailbox:
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119 def __init__(self, dirname):
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120 pat = regex.compile('^[0-9][0-9]*$')
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121 self.dirname = dirname
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122 files = os.listdir(self.dirname)
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123 self.boxes = []
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124 for f in files:
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125 if pat.match(f) == len(f):
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126 self.boxes.append(f)
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127
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128 def next(self):
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129 if not self.boxes:
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130 return None
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131 fn = self.boxes[0]
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132 del self.boxes[0]
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133 fp = open(os.path.join(self.dirname, fn))
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134 return rfc822.Message(fp)
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135
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136
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137 def _test():
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138 import time
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139 import sys
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140 import string
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141 import os
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142
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143 args = sys.argv[1:]
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144 if not args:
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145 if os.environ.has_key('MAIL'):
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146 mbox = os.environ['MAIL']
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147 elif os.environ.has_key('MAIL'):
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148 mbox = os.environ['USER']
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149 else:
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150 print "Who are you?"
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151 return
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152 else:
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153 mbox = args[0]
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154 if mbox[:1] == '+':
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155 mbox = os.environ['HOME'] + '/Mail/' + mbox[1:]
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156 elif not '/' in mbox:
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157 mbox = '/usr/mail/' + mbox
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158 if os.path.isdir(mbox):
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159 mb = MHMailbox(mbox)
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160 else:
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161 fp = open(mbox, 'r')
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162 mb = UnixMailbox(fp)
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163
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164 msgs = []
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165 while 1:
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166 msg = mb.next()
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167 if not msg:
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168 break
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169 msgs.append(msg)
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170 if len(args) > 1:
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171 num = string.atoi(args[1])
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172 print 'Message %d body:'%num
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173 msg = msgs[num-1]
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174 msg.rewindbody()
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175 sys.stdout.write(msg.fp.read())
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176 else:
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177 print 'Mailbox',mbox,'has',len(msgs),'messages:'
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178 for msg in msgs:
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179 f = msg.getheader('from')
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180 s = msg.getheader('subject')
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181 d = (msg.getheader('date'))
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182 print '%20.20s %18.18s %-30.30s'%(f, d[5:], s)
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183
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184
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185 if __name__ == '__main__':
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186 _test()