Mercurial > hg
annotate mercurial/utils/stringutil.py @ 37476:e9dea82ea1f3
wireproto: convert python literal to object without using unsafe eval()
Follows up cc5a040fe150.
At this point, I don't think we need a real eval(). If we want to support
a set literal, maybe we can vendor ast.literal_eval(), which is relatively
simple function.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 08 Apr 2018 11:55:46 +0900 |
parents | a67fd1fe5109 |
children | 68132a95df31 |
rev | line source |
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1 # stringutil.py - utility for generic string formatting, parsing, etc. |
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2 # |
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3 # Copyright 2005 K. Thananchayan <thananck@yahoo.com> |
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4 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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5 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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6 # |
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7 # This software may be used and distributed according to the terms of the |
10263 | 8 # GNU General Public License version 2 or any later version. |
1082 | 9 |
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10 from __future__ import absolute_import |
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12 import ast |
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13 import codecs |
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14 import re as remod |
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15 import textwrap |
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17 from ..i18n import _ |
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18 from ..thirdparty import attr |
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19 |
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20 from .. import ( |
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21 encoding, |
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22 error, |
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23 pycompat, |
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24 ) |
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25 |
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26 def pprint(o): |
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27 """Pretty print an object.""" |
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28 if isinstance(o, (bytes, bytearray)): |
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29 return "b'%s'" % escapestr(o) |
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30 elif isinstance(o, list): |
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31 return '[%s]' % (b', '.join(pprint(a) for a in o)) |
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32 elif isinstance(o, dict): |
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33 return '{%s}' % (b', '.join( |
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34 '%s: %s' % (pprint(k), pprint(v)) for k, v in sorted(o.items()))) |
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35 elif isinstance(o, bool): |
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36 return b'True' if o else b'False' |
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37 else: |
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38 raise error.ProgrammingError('do not know how to format %r' % o) |
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39 |
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40 def binary(s): |
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41 """return true if a string is binary data""" |
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42 return bool(s and '\0' in s) |
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44 def stringmatcher(pattern, casesensitive=True): |
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45 """ |
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46 accepts a string, possibly starting with 're:' or 'literal:' prefix. |
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47 returns the matcher name, pattern, and matcher function. |
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48 missing or unknown prefixes are treated as literal matches. |
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49 |
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50 helper for tests: |
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51 >>> def test(pattern, *tests): |
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52 ... kind, pattern, matcher = stringmatcher(pattern) |
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53 ... return (kind, pattern, [bool(matcher(t)) for t in tests]) |
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54 >>> def itest(pattern, *tests): |
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55 ... kind, pattern, matcher = stringmatcher(pattern, casesensitive=False) |
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56 ... return (kind, pattern, [bool(matcher(t)) for t in tests]) |
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57 |
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58 exact matching (no prefix): |
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59 >>> test(b'abcdefg', b'abc', b'def', b'abcdefg') |
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60 ('literal', 'abcdefg', [False, False, True]) |
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61 |
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62 regex matching ('re:' prefix) |
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63 >>> test(b're:a.+b', b'nomatch', b'fooadef', b'fooadefbar') |
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64 ('re', 'a.+b', [False, False, True]) |
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65 |
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66 force exact matches ('literal:' prefix) |
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67 >>> test(b'literal:re:foobar', b'foobar', b're:foobar') |
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68 ('literal', 're:foobar', [False, True]) |
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69 |
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70 unknown prefixes are ignored and treated as literals |
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71 >>> test(b'foo:bar', b'foo', b'bar', b'foo:bar') |
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72 ('literal', 'foo:bar', [False, False, True]) |
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73 |
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74 case insensitive regex matches |
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75 >>> itest(b're:A.+b', b'nomatch', b'fooadef', b'fooadefBar') |
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76 ('re', 'A.+b', [False, False, True]) |
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77 |
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78 case insensitive literal matches |
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79 >>> itest(b'ABCDEFG', b'abc', b'def', b'abcdefg') |
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80 ('literal', 'ABCDEFG', [False, False, True]) |
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81 """ |
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82 if pattern.startswith('re:'): |
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83 pattern = pattern[3:] |
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84 try: |
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85 flags = 0 |
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86 if not casesensitive: |
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87 flags = remod.I |
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88 regex = remod.compile(pattern, flags) |
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89 except remod.error as e: |
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90 raise error.ParseError(_('invalid regular expression: %s') |
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91 % e) |
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92 return 're', pattern, regex.search |
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93 elif pattern.startswith('literal:'): |
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94 pattern = pattern[8:] |
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95 |
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96 match = pattern.__eq__ |
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97 |
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98 if not casesensitive: |
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99 ipat = encoding.lower(pattern) |
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100 match = lambda s: ipat == encoding.lower(s) |
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101 return 'literal', pattern, match |
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102 |
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103 def shortuser(user): |
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104 """Return a short representation of a user name or email address.""" |
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105 f = user.find('@') |
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106 if f >= 0: |
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107 user = user[:f] |
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108 f = user.find('<') |
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109 if f >= 0: |
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110 user = user[f + 1:] |
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111 f = user.find(' ') |
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112 if f >= 0: |
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113 user = user[:f] |
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114 f = user.find('.') |
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115 if f >= 0: |
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116 user = user[:f] |
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117 return user |
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119 def emailuser(user): |
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120 """Return the user portion of an email address.""" |
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121 f = user.find('@') |
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122 if f >= 0: |
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123 user = user[:f] |
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124 f = user.find('<') |
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125 if f >= 0: |
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126 user = user[f + 1:] |
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127 return user |
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128 |
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129 def email(author): |
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130 '''get email of author.''' |
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131 r = author.find('>') |
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132 if r == -1: |
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133 r = None |
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134 return author[author.find('<') + 1:r] |
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135 |
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136 def person(author): |
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137 """Returns the name before an email address, |
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138 interpreting it as per RFC 5322 |
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139 |
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140 >>> person(b'foo@bar') |
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141 'foo' |
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142 >>> person(b'Foo Bar <foo@bar>') |
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143 'Foo Bar' |
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144 >>> person(b'"Foo Bar" <foo@bar>') |
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145 'Foo Bar' |
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146 >>> person(b'"Foo \"buz\" Bar" <foo@bar>') |
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147 'Foo "buz" Bar' |
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148 >>> # The following are invalid, but do exist in real-life |
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149 ... |
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150 >>> person(b'Foo "buz" Bar <foo@bar>') |
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151 'Foo "buz" Bar' |
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152 >>> person(b'"Foo Bar <foo@bar>') |
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153 'Foo Bar' |
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154 """ |
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155 if '@' not in author: |
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156 return author |
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157 f = author.find('<') |
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158 if f != -1: |
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159 return author[:f].strip(' "').replace('\\"', '"') |
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160 f = author.find('@') |
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161 return author[:f].replace('.', ' ') |
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162 |
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163 @attr.s(hash=True) |
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164 class mailmapping(object): |
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165 '''Represents a username/email key or value in |
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166 a mailmap file''' |
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167 email = attr.ib() |
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168 name = attr.ib(default=None) |
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169 |
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170 def _ismailmaplineinvalid(names, emails): |
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171 '''Returns True if the parsed names and emails |
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172 in a mailmap entry are invalid. |
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173 |
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174 >>> # No names or emails fails |
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175 >>> names, emails = [], [] |
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176 >>> _ismailmaplineinvalid(names, emails) |
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177 True |
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178 >>> # Only one email fails |
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179 >>> emails = [b'email@email.com'] |
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180 >>> _ismailmaplineinvalid(names, emails) |
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181 True |
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182 >>> # One email and one name passes |
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183 >>> names = [b'Test Name'] |
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184 >>> _ismailmaplineinvalid(names, emails) |
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185 False |
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186 >>> # No names but two emails passes |
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187 >>> names = [] |
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188 >>> emails = [b'proper@email.com', b'commit@email.com'] |
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189 >>> _ismailmaplineinvalid(names, emails) |
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190 False |
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191 ''' |
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192 return not emails or not names and len(emails) < 2 |
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193 |
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194 def parsemailmap(mailmapcontent): |
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195 """Parses data in the .mailmap format |
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196 |
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197 >>> mmdata = b"\\n".join([ |
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198 ... b'# Comment', |
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199 ... b'Name <commit1@email.xx>', |
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200 ... b'<name@email.xx> <commit2@email.xx>', |
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201 ... b'Name <proper@email.xx> <commit3@email.xx>', |
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202 ... b'Name <proper@email.xx> Commit <commit4@email.xx>', |
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203 ... ]) |
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204 >>> mm = parsemailmap(mmdata) |
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205 >>> for key in sorted(mm.keys()): |
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206 ... print(key) |
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207 mailmapping(email='commit1@email.xx', name=None) |
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208 mailmapping(email='commit2@email.xx', name=None) |
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209 mailmapping(email='commit3@email.xx', name=None) |
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210 mailmapping(email='commit4@email.xx', name='Commit') |
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211 >>> for val in sorted(mm.values()): |
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212 ... print(val) |
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213 mailmapping(email='commit1@email.xx', name='Name') |
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214 mailmapping(email='name@email.xx', name=None) |
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215 mailmapping(email='proper@email.xx', name='Name') |
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216 mailmapping(email='proper@email.xx', name='Name') |
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217 """ |
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218 mailmap = {} |
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219 |
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220 if mailmapcontent is None: |
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221 return mailmap |
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222 |
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223 for line in mailmapcontent.splitlines(): |
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224 |
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225 # Don't bother checking the line if it is a comment or |
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226 # is an improperly formed author field |
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227 if line.lstrip().startswith('#'): |
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228 continue |
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229 |
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230 # names, emails hold the parsed emails and names for each line |
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231 # name_builder holds the words in a persons name |
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232 names, emails = [], [] |
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233 namebuilder = [] |
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234 |
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235 for element in line.split(): |
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236 if element.startswith('#'): |
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237 # If we reach a comment in the mailmap file, move on |
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238 break |
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239 |
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240 elif element.startswith('<') and element.endswith('>'): |
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241 # We have found an email. |
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242 # Parse it, and finalize any names from earlier |
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243 emails.append(element[1:-1]) # Slice off the "<>" |
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244 |
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245 if namebuilder: |
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246 names.append(' '.join(namebuilder)) |
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247 namebuilder = [] |
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248 |
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249 # Break if we have found a second email, any other |
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250 # data does not fit the spec for .mailmap |
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251 if len(emails) > 1: |
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252 break |
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253 |
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254 else: |
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255 # We have found another word in the committers name |
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256 namebuilder.append(element) |
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257 |
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258 # Check to see if we have parsed the line into a valid form |
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259 # We require at least one email, and either at least one |
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260 # name or a second email |
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261 if _ismailmaplineinvalid(names, emails): |
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262 continue |
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263 |
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264 mailmapkey = mailmapping( |
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265 email=emails[-1], |
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266 name=names[-1] if len(names) == 2 else None, |
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267 ) |
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268 |
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269 mailmap[mailmapkey] = mailmapping( |
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270 email=emails[0], |
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271 name=names[0] if names else None, |
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272 ) |
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273 |
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274 return mailmap |
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275 |
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276 def mapname(mailmap, author): |
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277 """Returns the author field according to the mailmap cache, or |
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278 the original author field. |
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279 |
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280 >>> mmdata = b"\\n".join([ |
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281 ... b'# Comment', |
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282 ... b'Name <commit1@email.xx>', |
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283 ... b'<name@email.xx> <commit2@email.xx>', |
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284 ... b'Name <proper@email.xx> <commit3@email.xx>', |
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285 ... b'Name <proper@email.xx> Commit <commit4@email.xx>', |
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286 ... ]) |
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287 >>> m = parsemailmap(mmdata) |
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288 >>> mapname(m, b'Commit <commit1@email.xx>') |
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289 'Name <commit1@email.xx>' |
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290 >>> mapname(m, b'Name <commit2@email.xx>') |
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291 'Name <name@email.xx>' |
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292 >>> mapname(m, b'Commit <commit3@email.xx>') |
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293 'Name <proper@email.xx>' |
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294 >>> mapname(m, b'Commit <commit4@email.xx>') |
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295 'Name <proper@email.xx>' |
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296 >>> mapname(m, b'Unknown Name <unknown@email.com>') |
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297 'Unknown Name <unknown@email.com>' |
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298 """ |
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299 # If the author field coming in isn't in the correct format, |
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300 # or the mailmap is empty just return the original author field |
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301 if not isauthorwellformed(author) or not mailmap: |
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302 return author |
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303 |
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304 # Turn the user name into a mailmapping |
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305 commit = mailmapping(name=person(author), email=email(author)) |
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306 |
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307 try: |
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308 # Try and use both the commit email and name as the key |
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309 proper = mailmap[commit] |
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310 |
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311 except KeyError: |
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312 # If the lookup fails, use just the email as the key instead |
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313 # We call this commit2 as not to erase original commit fields |
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314 commit2 = mailmapping(email=commit.email) |
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315 proper = mailmap.get(commit2, mailmapping(None, None)) |
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316 |
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317 # Return the author field with proper values filled in |
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318 return '%s <%s>' % ( |
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319 proper.name if proper.name else commit.name, |
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320 proper.email if proper.email else commit.email, |
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321 ) |
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322 |
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323 _correctauthorformat = remod.compile(br'^[^<]+\s\<[^<>]+@[^<>]+\>$') |
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324 |
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325 def isauthorwellformed(author): |
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326 '''Return True if the author field is well formed |
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327 (ie "Contributor Name <contrib@email.dom>") |
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328 |
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329 >>> isauthorwellformed(b'Good Author <good@author.com>') |
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330 True |
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331 >>> isauthorwellformed(b'Author <good@author.com>') |
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332 True |
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333 >>> isauthorwellformed(b'Bad Author') |
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334 False |
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335 >>> isauthorwellformed(b'Bad Author <author@author.com') |
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336 False |
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337 >>> isauthorwellformed(b'Bad Author author@author.com') |
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338 False |
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339 >>> isauthorwellformed(b'<author@author.com>') |
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340 False |
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341 >>> isauthorwellformed(b'Bad Author <author>') |
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342 False |
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343 ''' |
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344 return _correctauthorformat.match(author) is not None |
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345 |
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346 def ellipsis(text, maxlength=400): |
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347 """Trim string to at most maxlength (default: 400) columns in display.""" |
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348 return encoding.trim(text, maxlength, ellipsis='...') |
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349 |
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350 def escapestr(s): |
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351 # call underlying function of s.encode('string_escape') directly for |
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352 # Python 3 compatibility |
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353 return codecs.escape_encode(s)[0] |
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354 |
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355 def unescapestr(s): |
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356 return codecs.escape_decode(s)[0] |
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357 |
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358 def forcebytestr(obj): |
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359 """Portably format an arbitrary object (e.g. exception) into a byte |
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360 string.""" |
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361 try: |
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362 return pycompat.bytestr(obj) |
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363 except UnicodeEncodeError: |
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364 # non-ascii string, may be lossy |
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365 return pycompat.bytestr(encoding.strtolocal(str(obj))) |
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366 |
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367 def uirepr(s): |
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368 # Avoid double backslash in Windows path repr() |
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369 return pycompat.byterepr(pycompat.bytestr(s)).replace(b'\\\\', b'\\') |
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370 |
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371 # delay import of textwrap |
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372 def _MBTextWrapper(**kwargs): |
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373 class tw(textwrap.TextWrapper): |
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374 """ |
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375 Extend TextWrapper for width-awareness. |
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376 |
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377 Neither number of 'bytes' in any encoding nor 'characters' is |
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378 appropriate to calculate terminal columns for specified string. |
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379 |
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380 Original TextWrapper implementation uses built-in 'len()' directly, |
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381 so overriding is needed to use width information of each characters. |
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382 |
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383 In addition, characters classified into 'ambiguous' width are |
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384 treated as wide in East Asian area, but as narrow in other. |
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385 |
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386 This requires use decision to determine width of such characters. |
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387 """ |
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388 def _cutdown(self, ucstr, space_left): |
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389 l = 0 |
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390 colwidth = encoding.ucolwidth |
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391 for i in xrange(len(ucstr)): |
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392 l += colwidth(ucstr[i]) |
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393 if space_left < l: |
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394 return (ucstr[:i], ucstr[i:]) |
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395 return ucstr, '' |
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396 |
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397 # overriding of base class |
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398 def _handle_long_word(self, reversed_chunks, cur_line, cur_len, width): |
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399 space_left = max(width - cur_len, 1) |
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400 |
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401 if self.break_long_words: |
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402 cut, res = self._cutdown(reversed_chunks[-1], space_left) |
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403 cur_line.append(cut) |
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404 reversed_chunks[-1] = res |
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405 elif not cur_line: |
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406 cur_line.append(reversed_chunks.pop()) |
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407 |
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408 # this overriding code is imported from TextWrapper of Python 2.6 |
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409 # to calculate columns of string by 'encoding.ucolwidth()' |
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410 def _wrap_chunks(self, chunks): |
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411 colwidth = encoding.ucolwidth |
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412 |
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413 lines = [] |
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414 if self.width <= 0: |
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415 raise ValueError("invalid width %r (must be > 0)" % self.width) |
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416 |
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417 # Arrange in reverse order so items can be efficiently popped |
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418 # from a stack of chucks. |
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419 chunks.reverse() |
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420 |
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421 while chunks: |
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422 |
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423 # Start the list of chunks that will make up the current line. |
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424 # cur_len is just the length of all the chunks in cur_line. |
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425 cur_line = [] |
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426 cur_len = 0 |
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427 |
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428 # Figure out which static string will prefix this line. |
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429 if lines: |
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430 indent = self.subsequent_indent |
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431 else: |
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432 indent = self.initial_indent |
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433 |
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434 # Maximum width for this line. |
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435 width = self.width - len(indent) |
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436 |
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437 # First chunk on line is whitespace -- drop it, unless this |
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438 # is the very beginning of the text (i.e. no lines started yet). |
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439 if self.drop_whitespace and chunks[-1].strip() == r'' and lines: |
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440 del chunks[-1] |
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441 |
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442 while chunks: |
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443 l = colwidth(chunks[-1]) |
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444 |
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445 # Can at least squeeze this chunk onto the current line. |
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446 if cur_len + l <= width: |
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447 cur_line.append(chunks.pop()) |
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448 cur_len += l |
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449 |
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450 # Nope, this line is full. |
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451 else: |
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452 break |
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453 |
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454 # The current line is full, and the next chunk is too big to |
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455 # fit on *any* line (not just this one). |
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456 if chunks and colwidth(chunks[-1]) > width: |
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457 self._handle_long_word(chunks, cur_line, cur_len, width) |
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458 |
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459 # If the last chunk on this line is all whitespace, drop it. |
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460 if (self.drop_whitespace and |
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461 cur_line and cur_line[-1].strip() == r''): |
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462 del cur_line[-1] |
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463 |
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464 # Convert current line back to a string and store it in list |
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465 # of all lines (return value). |
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466 if cur_line: |
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467 lines.append(indent + r''.join(cur_line)) |
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468 |
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469 return lines |
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470 |
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471 global _MBTextWrapper |
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472 _MBTextWrapper = tw |
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473 return tw(**kwargs) |
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474 |
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475 def wrap(line, width, initindent='', hangindent=''): |
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476 maxindent = max(len(hangindent), len(initindent)) |
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477 if width <= maxindent: |
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478 # adjust for weird terminal size |
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479 width = max(78, maxindent + 1) |
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480 line = line.decode(pycompat.sysstr(encoding.encoding), |
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481 pycompat.sysstr(encoding.encodingmode)) |
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482 initindent = initindent.decode(pycompat.sysstr(encoding.encoding), |
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483 pycompat.sysstr(encoding.encodingmode)) |
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484 hangindent = hangindent.decode(pycompat.sysstr(encoding.encoding), |
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485 pycompat.sysstr(encoding.encodingmode)) |
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486 wrapper = _MBTextWrapper(width=width, |
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487 initial_indent=initindent, |
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488 subsequent_indent=hangindent) |
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489 return wrapper.fill(line).encode(pycompat.sysstr(encoding.encoding)) |
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490 |
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491 _booleans = {'1': True, 'yes': True, 'true': True, 'on': True, 'always': True, |
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492 '0': False, 'no': False, 'false': False, 'off': False, |
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493 'never': False} |
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494 |
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495 def parsebool(s): |
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496 """Parse s into a boolean. |
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497 |
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498 If s is not a valid boolean, returns None. |
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499 """ |
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500 return _booleans.get(s.lower(), None) |
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501 |
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502 def evalpythonliteral(s): |
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503 """Evaluate a string containing a Python literal expression""" |
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504 # We could backport our tokenizer hack to rewrite '' to u'' if we want |
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505 return ast.literal_eval(s) |