annotate Lib/email/_parseaddr.py @ 80661:94de77bd0b4b 2.7

Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents a283563c8cc4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Copyright (C) 2002-2007 Python Software Foundation
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2 # Contact: email-sig@python.org
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3
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4 """Email address parsing code.
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5
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6 Lifted directly from rfc822.py. This should eventually be rewritten.
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7 """
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8
37078
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9 __all__ = [
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10 'mktime_tz',
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11 'parsedate',
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12 'parsedate_tz',
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13 'quote',
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14 ]
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15
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16 import time, calendar
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17
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18 SPACE = ' '
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19 EMPTYSTRING = ''
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20 COMMASPACE = ', '
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21
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22 # Parse a date field
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23 _monthnames = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul',
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24 'aug', 'sep', 'oct', 'nov', 'dec',
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25 'january', 'february', 'march', 'april', 'may', 'june', 'july',
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26 'august', 'september', 'october', 'november', 'december']
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27
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28 _daynames = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun']
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29
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30 # The timezone table does not include the military time zones defined
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31 # in RFC822, other than Z. According to RFC1123, the description in
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32 # RFC822 gets the signs wrong, so we can't rely on any such time
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33 # zones. RFC1123 recommends that numeric timezone indicators be used
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34 # instead of timezone names.
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35
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36 _timezones = {'UT':0, 'UTC':0, 'GMT':0, 'Z':0,
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37 'AST': -400, 'ADT': -300, # Atlantic (used in Canada)
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38 'EST': -500, 'EDT': -400, # Eastern
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39 'CST': -600, 'CDT': -500, # Central
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40 'MST': -700, 'MDT': -600, # Mountain
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41 'PST': -800, 'PDT': -700 # Pacific
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42 }
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43
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44
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45 def parsedate_tz(data):
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46 """Convert a date string to a time tuple.
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47
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48 Accounts for military timezones.
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49 """
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50 data = data.split()
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51 # The FWS after the comma after the day-of-week is optional, so search and
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52 # adjust for this.
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53 if data[0].endswith(',') or data[0].lower() in _daynames:
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54 # There's a dayname here. Skip it
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55 del data[0]
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56 else:
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57 i = data[0].rfind(',')
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58 if i >= 0:
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59 data[0] = data[0][i+1:]
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60 if len(data) == 3: # RFC 850 date, deprecated
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61 stuff = data[0].split('-')
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62 if len(stuff) == 3:
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63 data = stuff + data[1:]
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64 if len(data) == 4:
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65 s = data[3]
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66 i = s.find('+')
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67 if i > 0:
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68 data[3:] = [s[:i], s[i+1:]]
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69 else:
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70 data.append('') # Dummy tz
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71 if len(data) < 5:
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72 return None
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73 data = data[:5]
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74 [dd, mm, yy, tm, tz] = data
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75 mm = mm.lower()
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76 if mm not in _monthnames:
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77 dd, mm = mm, dd.lower()
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78 if mm not in _monthnames:
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79 return None
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80 mm = _monthnames.index(mm) + 1
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81 if mm > 12:
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82 mm -= 12
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83 if dd[-1] == ',':
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84 dd = dd[:-1]
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85 i = yy.find(':')
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86 if i > 0:
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87 yy, tm = tm, yy
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88 if yy[-1] == ',':
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89 yy = yy[:-1]
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90 if not yy[0].isdigit():
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91 yy, tz = tz, yy
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92 if tm[-1] == ',':
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93 tm = tm[:-1]
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94 tm = tm.split(':')
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95 if len(tm) == 2:
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96 [thh, tmm] = tm
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97 tss = '0'
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98 elif len(tm) == 3:
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99 [thh, tmm, tss] = tm
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100 else:
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101 return None
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102 try:
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103 yy = int(yy)
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104 dd = int(dd)
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105 thh = int(thh)
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106 tmm = int(tmm)
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107 tss = int(tss)
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108 except ValueError:
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109 return None
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110 # Check for a yy specified in two-digit format, then convert it to the
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111 # appropriate four-digit format, according to the POSIX standard. RFC 822
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112 # calls for a two-digit yy, but RFC 2822 (which obsoletes RFC 822)
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113 # mandates a 4-digit yy. For more information, see the documentation for
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114 # the time module.
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115 if yy < 100:
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116 # The year is between 1969 and 1999 (inclusive).
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117 if yy > 68:
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118 yy += 1900
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119 # The year is between 2000 and 2068 (inclusive).
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120 else:
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121 yy += 2000
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122 tzoffset = None
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123 tz = tz.upper()
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124 if tz in _timezones:
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125 tzoffset = _timezones[tz]
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126 else:
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127 try:
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128 tzoffset = int(tz)
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129 except ValueError:
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130 pass
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131 # Convert a timezone offset into seconds ; -0500 -> -18000
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132 if tzoffset:
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133 if tzoffset < 0:
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134 tzsign = -1
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135 tzoffset = -tzoffset
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136 else:
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137 tzsign = 1
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138 tzoffset = tzsign * ( (tzoffset//100)*3600 + (tzoffset % 100)*60)
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139 # Daylight Saving Time flag is set to -1, since DST is unknown.
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140 return yy, mm, dd, thh, tmm, tss, 0, 1, -1, tzoffset
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141
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142
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143 def parsedate(data):
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144 """Convert a time string to a time tuple."""
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145 t = parsedate_tz(data)
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146 if isinstance(t, tuple):
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147 return t[:9]
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148 else:
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149 return t
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150
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151
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152 def mktime_tz(data):
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153 """Turn a 10-tuple as returned by parsedate_tz() into a POSIX timestamp."""
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154 if data[9] is None:
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155 # No zone info, so localtime is better assumption than GMT
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156 return time.mktime(data[:8] + (-1,))
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157 else:
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158 t = calendar.timegm(data)
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159 return t - data[9]
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160
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161
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162 def quote(str):
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163 """Prepare string to be used in a quoted string.
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164
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165 Turns backslash and double quote characters into quoted pairs. These
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166 are the only characters that need to be quoted inside a quoted string.
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167 Does not add the surrounding double quotes.
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168 """
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169 return str.replace('\\', '\\\\').replace('"', '\\"')
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170
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171
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172 class AddrlistClass:
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173 """Address parser class by Ben Escoto.
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174
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175 To understand what this class does, it helps to have a copy of RFC 2822 in
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176 front of you.
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177
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178 Note: this class interface is deprecated and may be removed in the future.
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179 Use rfc822.AddressList instead.
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180 """
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181
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182 def __init__(self, field):
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183 """Initialize a new instance.
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184
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185 `field' is an unparsed address header field, containing
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186 one or more addresses.
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187 """
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188 self.specials = '()<>@,:;.\"[]'
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189 self.pos = 0
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190 self.LWS = ' \t'
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191 self.CR = '\r\n'
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192 self.FWS = self.LWS + self.CR
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193 self.atomends = self.specials + self.LWS + self.CR
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194 # Note that RFC 2822 now specifies `.' as obs-phrase, meaning that it
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195 # is obsolete syntax. RFC 2822 requires that we recognize obsolete
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196 # syntax, so allow dots in phrases.
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197 self.phraseends = self.atomends.replace('.', '')
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198 self.field = field
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199 self.commentlist = []
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200
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201 def gotonext(self):
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202 """Parse up to the start of the next address."""
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203 while self.pos < len(self.field):
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204 if self.field[self.pos] in self.LWS + '\n\r':
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205 self.pos += 1
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206 elif self.field[self.pos] == '(':
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207 self.commentlist.append(self.getcomment())
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208 else:
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209 break
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210
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211 def getaddrlist(self):
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212 """Parse all addresses.
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213
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214 Returns a list containing all of the addresses.
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215 """
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216 result = []
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217 while self.pos < len(self.field):
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218 ad = self.getaddress()
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219 if ad:
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220 result += ad
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221 else:
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222 result.append(('', ''))
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223 return result
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224
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225 def getaddress(self):
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226 """Parse the next address."""
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227 self.commentlist = []
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228 self.gotonext()
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229
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230 oldpos = self.pos
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231 oldcl = self.commentlist
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232 plist = self.getphraselist()
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233
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234 self.gotonext()
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235 returnlist = []
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236
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237 if self.pos >= len(self.field):
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238 # Bad email address technically, no domain.
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239 if plist:
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240 returnlist = [(SPACE.join(self.commentlist), plist[0])]
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241
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242 elif self.field[self.pos] in '.@':
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243 # email address is just an addrspec
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244 # this isn't very efficient since we start over
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245 self.pos = oldpos
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246 self.commentlist = oldcl
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247 addrspec = self.getaddrspec()
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248 returnlist = [(SPACE.join(self.commentlist), addrspec)]
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249
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250 elif self.field[self.pos] == ':':
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251 # address is a group
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252 returnlist = []
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253
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254 fieldlen = len(self.field)
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255 self.pos += 1
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256 while self.pos < len(self.field):
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257 self.gotonext()
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258 if self.pos < fieldlen and self.field[self.pos] == ';':
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259 self.pos += 1
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260 break
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261 returnlist = returnlist + self.getaddress()
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262
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263 elif self.field[self.pos] == '<':
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264 # Address is a phrase then a route addr
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265 routeaddr = self.getrouteaddr()
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266
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267 if self.commentlist:
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268 returnlist = [(SPACE.join(plist) + ' (' +
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269 ' '.join(self.commentlist) + ')', routeaddr)]
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270 else:
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271 returnlist = [(SPACE.join(plist), routeaddr)]
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272
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273 else:
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274 if plist:
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275 returnlist = [(SPACE.join(self.commentlist), plist[0])]
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276 elif self.field[self.pos] in self.specials:
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277 self.pos += 1
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278
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279 self.gotonext()
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280 if self.pos < len(self.field) and self.field[self.pos] == ',':
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281 self.pos += 1
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282 return returnlist
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283
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284 def getrouteaddr(self):
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285 """Parse a route address (Return-path value).
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286
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287 This method just skips all the route stuff and returns the addrspec.
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288 """
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diff changeset
289 if self.field[self.pos] != '<':
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290 return
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291
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292 expectroute = False
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293 self.pos += 1
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294 self.gotonext()
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295 adlist = ''
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296 while self.pos < len(self.field):
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297 if expectroute:
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298 self.getdomain()
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299 expectroute = False
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300 elif self.field[self.pos] == '>':
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301 self.pos += 1
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302 break
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303 elif self.field[self.pos] == '@':
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304 self.pos += 1
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305 expectroute = True
26046
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306 elif self.field[self.pos] == ':':
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307 self.pos += 1
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308 else:
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309 adlist = self.getaddrspec()
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310 self.pos += 1
26046
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Barry Warsaw <barry@python.org>
parents:
diff changeset
311 break
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
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312 self.gotonext()
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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313
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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314 return adlist
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
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315
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
316 def getaddrspec(self):
26848
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Barry Warsaw <barry@python.org>
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317 """Parse an RFC 2822 addr-spec."""
26046
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parents:
diff changeset
318 aslist = []
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319
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Barry Warsaw <barry@python.org>
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320 self.gotonext()
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Barry Warsaw <barry@python.org>
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diff changeset
321 while self.pos < len(self.field):
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
322 if self.field[self.pos] == '.':
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
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diff changeset
323 aslist.append('.')
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324 self.pos += 1
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
325 elif self.field[self.pos] == '"':
65064
f3a70d99d7e0 Merged revisions 85179 via svnmerge from
R. David Murray <rdmurray@bitdance.com>
parents: 64275
diff changeset
326 aslist.append('"%s"' % quote(self.getquote()))
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
327 elif self.field[self.pos] in self.atomends:
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
328 break
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329 else:
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330 aslist.append(self.getatom())
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
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331 self.gotonext()
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diff changeset
332
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
333 if self.pos >= len(self.field) or self.field[self.pos] != '@':
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334 return EMPTYSTRING.join(aslist)
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335
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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336 aslist.append('@')
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337 self.pos += 1
26046
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diff changeset
338 self.gotonext()
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diff changeset
339 return EMPTYSTRING.join(aslist) + self.getdomain()
26046
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340
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341 def getdomain(self):
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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parents:
diff changeset
342 """Get the complete domain name from an address."""
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343 sdlist = []
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344 while self.pos < len(self.field):
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
345 if self.field[self.pos] in self.LWS:
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346 self.pos += 1
26046
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347 elif self.field[self.pos] == '(':
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
348 self.commentlist.append(self.getcomment())
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
349 elif self.field[self.pos] == '[':
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350 sdlist.append(self.getdomainliteral())
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
351 elif self.field[self.pos] == '.':
26850
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diff changeset
352 self.pos += 1
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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353 sdlist.append('.')
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
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diff changeset
354 elif self.field[self.pos] in self.atomends:
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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diff changeset
355 break
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
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diff changeset
356 else:
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diff changeset
357 sdlist.append(self.getatom())
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diff changeset
358 return EMPTYSTRING.join(sdlist)
26046
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359
26850
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diff changeset
360 def getdelimited(self, beginchar, endchars, allowcomments=True):
26046
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Barry Warsaw <barry@python.org>
parents:
diff changeset
361 """Parse a header fragment delimited by special characters.
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
362
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
363 `beginchar' is the start character for the fragment.
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
364 If self is not looking at an instance of `beginchar' then
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
365 getdelimited returns the empty string.
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
366
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
367 `endchars' is a sequence of allowable end-delimiting characters.
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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parents:
diff changeset
368 Parsing stops when one of these is encountered.
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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parents:
diff changeset
369
26848
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
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diff changeset
370 If `allowcomments' is non-zero, embedded RFC 2822 comments are allowed
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
Barry Warsaw <barry@python.org>
parents: 26046
diff changeset
371 within the parsed fragment.
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
372 """
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
373 if self.field[self.pos] != beginchar:
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
374 return ''
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
375
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
376 slist = ['']
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
parents: 26848
diff changeset
377 quote = False
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
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diff changeset
378 self.pos += 1
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
379 while self.pos < len(self.field):
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
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diff changeset
380 if quote:
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
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diff changeset
381 slist.append(self.field[self.pos])
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
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diff changeset
382 quote = False
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
383 elif self.field[self.pos] in endchars:
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
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diff changeset
384 self.pos += 1
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
385 break
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
386 elif allowcomments and self.field[self.pos] == '(':
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
387 slist.append(self.getcomment())
38063
f62bd5118c78 Port forward from 2.4 branch:
Barry Warsaw <barry@python.org>
parents: 37421
diff changeset
388 continue # have already advanced pos from getcomment
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
389 elif self.field[self.pos] == '\\':
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
parents: 26848
diff changeset
390 quote = True
26046
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Barry Warsaw <barry@python.org>
parents:
diff changeset
391 else:
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
392 slist.append(self.field[self.pos])
26850
803302573152 A code cleansing pass
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diff changeset
393 self.pos += 1
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
394
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
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diff changeset
395 return EMPTYSTRING.join(slist)
26046
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Barry Warsaw <barry@python.org>
parents:
diff changeset
396
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
397 def getquote(self):
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
398 """Get a quote-delimited fragment from self's field."""
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
parents: 26848
diff changeset
399 return self.getdelimited('"', '"\r', False)
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
400
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
401 def getcomment(self):
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
402 """Get a parenthesis-delimited fragment from self's field."""
26850
803302573152 A code cleansing pass
Barry Warsaw <barry@python.org>
parents: 26848
diff changeset
403 return self.getdelimited('(', ')\r', True)
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
404
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
Barry Warsaw <barry@python.org>
parents:
diff changeset
405 def getdomainliteral(self):
26848
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
Barry Warsaw <barry@python.org>
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406 """Parse an RFC 2822 domain-literal."""
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407 return '[%s]' % self.getdelimited('[', ']\r', False)
26046
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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parents:
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408
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409 def getatom(self, atomends=None):
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410 """Parse an RFC 2822 atom.
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411
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
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412 Optional atomends specifies a different set of end token delimiters
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413 (the default is to use self.atomends). This is used e.g. in
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
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414 getphraselist() since phrase endings must not include the `.' (which
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
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415 is legal in phrases)."""
26046
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416 atomlist = ['']
26848
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417 if atomends is None:
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418 atomends = self.atomends
26046
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419
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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420 while self.pos < len(self.field):
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865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
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421 if self.field[self.pos] in atomends:
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422 break
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423 else:
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424 atomlist.append(self.field[self.pos])
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425 self.pos += 1
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426
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427 return EMPTYSTRING.join(atomlist)
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428
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429 def getphraselist(self):
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430 """Parse a sequence of RFC 2822 phrases.
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431
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432 A phrase is a sequence of words, which are in turn either RFC 2822
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
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433 atoms or quoted-strings. Phrases are canonicalized by squeezing all
865c59b5bfd7 Port rfc822.py changes that didn't make it into this copy,
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434 runs of continuous whitespace into one space.
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435 """
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436 plist = []
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437
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438 while self.pos < len(self.field):
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d850bf56fdf6 Tokio Kikuchi's fix for SF bug #1629369; folding whitespace allowed in the
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439 if self.field[self.pos] in self.FWS:
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440 self.pos += 1
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441 elif self.field[self.pos] == '"':
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442 plist.append(self.getquote())
1dbabc5beff7 Jason Mastaler's patch to break the dependence on rfc822.py for the
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443 elif self.field[self.pos] == '(':
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444 self.commentlist.append(self.getcomment())
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445 elif self.field[self.pos] in self.phraseends:
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446 break
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447 else:
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448 plist.append(self.getatom(self.phraseends))
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449
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450 return plist
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451
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452 class AddressList(AddrlistClass):
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453 """An AddressList encapsulates a list of parsed RFC 2822 addresses."""
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454 def __init__(self, field):
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455 AddrlistClass.__init__(self, field)
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456 if field:
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457 self.addresslist = self.getaddrlist()
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458 else:
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459 self.addresslist = []
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460
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461 def __len__(self):
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462 return len(self.addresslist)
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463
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464 def __add__(self, other):
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465 # Set union
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466 newaddr = AddressList(None)
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467 newaddr.addresslist = self.addresslist[:]
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468 for x in other.addresslist:
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469 if not x in self.addresslist:
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470 newaddr.addresslist.append(x)
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471 return newaddr
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472
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473 def __iadd__(self, other):
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474 # Set union, in-place
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475 for x in other.addresslist:
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476 if not x in self.addresslist:
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477 self.addresslist.append(x)
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478 return self
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479
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480 def __sub__(self, other):
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481 # Set difference
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482 newaddr = AddressList(None)
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483 for x in self.addresslist:
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484 if not x in other.addresslist:
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485 newaddr.addresslist.append(x)
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486 return newaddr
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487
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488 def __isub__(self, other):
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489 # Set difference, in-place
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490 for x in other.addresslist:
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491 if x in self.addresslist:
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492 self.addresslist.remove(x)
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493 return self
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494
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495 def __getitem__(self, index):
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496 # Make indexing, slices, and 'in' work
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497 return self.addresslist[index]