Mercurial > hg
annotate mercurial/encoding.py @ 32078:bf5e13e38390 stable
pager: use less as a fallback on Unix
This seems reasonable choice per discussion, and the default-default of Git.
See also the inline-comment for why.
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-April/097042.html
author | Yuya Nishihara <yuya@tcha.org> |
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date | Fri, 28 Apr 2017 20:51:14 +0900 |
parents | 7d2cbe11ae48 |
children | 6c0ae9683437 |
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1 # encoding.py - character transcoding support for Mercurial |
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2 # |
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3 # Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import array |
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11 import locale |
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12 import os |
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13 import unicodedata |
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14 |
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15 from . import ( |
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16 error, |
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17 pycompat, |
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18 ) |
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19 |
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20 _sysstr = pycompat.sysstr |
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21 |
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22 if pycompat.ispy3: |
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23 unichr = chr |
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24 |
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25 # These unicode characters are ignored by HFS+ (Apple Technote 1150, |
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26 # "Unicode Subtleties"), so we need to ignore them in some places for |
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27 # sanity. |
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28 _ignore = [unichr(int(x, 16)).encode("utf-8") for x in |
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29 "200c 200d 200e 200f 202a 202b 202c 202d 202e " |
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30 "206a 206b 206c 206d 206e 206f feff".split()] |
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31 # verify the next function will work |
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32 if pycompat.ispy3: |
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33 assert set(i[0] for i in _ignore) == set([ord(b'\xe2'), ord(b'\xef')]) |
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34 else: |
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35 assert set(i[0] for i in _ignore) == set(["\xe2", "\xef"]) |
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36 |
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37 def hfsignoreclean(s): |
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38 """Remove codepoints ignored by HFS+ from s. |
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39 |
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40 >>> hfsignoreclean(u'.h\u200cg'.encode('utf-8')) |
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41 '.hg' |
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42 >>> hfsignoreclean(u'.h\ufeffg'.encode('utf-8')) |
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43 '.hg' |
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44 """ |
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45 if "\xe2" in s or "\xef" in s: |
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46 for c in _ignore: |
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47 s = s.replace(c, '') |
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48 return s |
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49 |
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50 # encoding.environ is provided read-only, which may not be used to modify |
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51 # the process environment |
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52 _nativeenviron = (not pycompat.ispy3 or os.supports_bytes_environ) |
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53 if not pycompat.ispy3: |
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54 environ = os.environ |
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55 elif _nativeenviron: |
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56 environ = os.environb |
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57 else: |
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58 # preferred encoding isn't known yet; use utf-8 to avoid unicode error |
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59 # and recreate it once encoding is settled |
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60 environ = dict((k.encode(u'utf-8'), v.encode(u'utf-8')) |
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61 for k, v in os.environ.items()) |
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62 |
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63 def _getpreferredencoding(): |
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64 ''' |
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65 On darwin, getpreferredencoding ignores the locale environment and |
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66 always returns mac-roman. http://bugs.python.org/issue6202 fixes this |
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67 for Python 2.7 and up. This is the same corrected code for earlier |
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68 Python versions. |
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69 |
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70 However, we can't use a version check for this method, as some distributions |
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71 patch Python to fix this. Instead, we use it as a 'fixer' for the mac-roman |
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72 encoding, as it is unlikely that this encoding is the actually expected. |
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73 ''' |
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74 try: |
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75 locale.CODESET |
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76 except AttributeError: |
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77 # Fall back to parsing environment variables :-( |
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78 return locale.getdefaultlocale()[1] |
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79 |
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80 oldloc = locale.setlocale(locale.LC_CTYPE) |
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81 locale.setlocale(locale.LC_CTYPE, "") |
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82 result = locale.nl_langinfo(locale.CODESET) |
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83 locale.setlocale(locale.LC_CTYPE, oldloc) |
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84 |
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85 return result |
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86 |
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87 _encodingfixers = { |
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88 '646': lambda: 'ascii', |
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89 'ANSI_X3.4-1968': lambda: 'ascii', |
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90 'mac-roman': _getpreferredencoding |
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91 } |
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92 |
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93 try: |
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94 encoding = environ.get("HGENCODING") |
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95 if not encoding: |
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96 encoding = locale.getpreferredencoding().encode('ascii') or 'ascii' |
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97 encoding = _encodingfixers.get(encoding, lambda: encoding)() |
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98 except locale.Error: |
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99 encoding = 'ascii' |
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100 encodingmode = environ.get("HGENCODINGMODE", "strict") |
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101 fallbackencoding = 'ISO-8859-1' |
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102 |
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103 class localstr(str): |
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104 '''This class allows strings that are unmodified to be |
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105 round-tripped to the local encoding and back''' |
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106 def __new__(cls, u, l): |
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107 s = str.__new__(cls, l) |
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108 s._utf8 = u |
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109 return s |
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110 def __hash__(self): |
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111 return hash(self._utf8) # avoid collisions in local string space |
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112 |
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113 def tolocal(s): |
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114 """ |
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115 Convert a string from internal UTF-8 to local encoding |
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116 |
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117 All internal strings should be UTF-8 but some repos before the |
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118 implementation of locale support may contain latin1 or possibly |
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119 other character sets. We attempt to decode everything strictly |
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120 using UTF-8, then Latin-1, and failing that, we use UTF-8 and |
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121 replace unknown characters. |
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122 |
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123 The localstr class is used to cache the known UTF-8 encoding of |
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124 strings next to their local representation to allow lossless |
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125 round-trip conversion back to UTF-8. |
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126 |
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127 >>> u = 'foo: \\xc3\\xa4' # utf-8 |
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128 >>> l = tolocal(u) |
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129 >>> l |
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130 'foo: ?' |
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131 >>> fromlocal(l) |
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132 'foo: \\xc3\\xa4' |
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133 >>> u2 = 'foo: \\xc3\\xa1' |
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134 >>> d = { l: 1, tolocal(u2): 2 } |
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135 >>> len(d) # no collision |
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136 2 |
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137 >>> 'foo: ?' in d |
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138 False |
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139 >>> l1 = 'foo: \\xe4' # historical latin1 fallback |
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140 >>> l = tolocal(l1) |
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141 >>> l |
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142 'foo: ?' |
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143 >>> fromlocal(l) # magically in utf-8 |
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144 'foo: \\xc3\\xa4' |
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145 """ |
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146 |
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147 try: |
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148 try: |
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149 # make sure string is actually stored in UTF-8 |
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150 u = s.decode('UTF-8') |
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151 if encoding == 'UTF-8': |
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152 # fast path |
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153 return s |
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154 r = u.encode(_sysstr(encoding), u"replace") |
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155 if u == r.decode(_sysstr(encoding)): |
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156 # r is a safe, non-lossy encoding of s |
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157 return r |
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158 return localstr(s, r) |
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159 except UnicodeDecodeError: |
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160 # we should only get here if we're looking at an ancient changeset |
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161 try: |
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162 u = s.decode(_sysstr(fallbackencoding)) |
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163 r = u.encode(_sysstr(encoding), u"replace") |
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164 if u == r.decode(_sysstr(encoding)): |
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165 # r is a safe, non-lossy encoding of s |
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166 return r |
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167 return localstr(u.encode('UTF-8'), r) |
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168 except UnicodeDecodeError: |
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169 u = s.decode("utf-8", "replace") # last ditch |
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170 # can't round-trip |
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171 return u.encode(_sysstr(encoding), u"replace") |
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172 except LookupError as k: |
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173 raise error.Abort(k, hint="please check your locale settings") |
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174 |
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175 def fromlocal(s): |
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176 """ |
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177 Convert a string from the local character encoding to UTF-8 |
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178 |
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179 We attempt to decode strings using the encoding mode set by |
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180 HGENCODINGMODE, which defaults to 'strict'. In this mode, unknown |
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181 characters will cause an error message. Other modes include |
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182 'replace', which replaces unknown characters with a special |
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183 Unicode character, and 'ignore', which drops the character. |
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184 """ |
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185 |
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186 # can we do a lossless round-trip? |
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187 if isinstance(s, localstr): |
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188 return s._utf8 |
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189 |
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190 try: |
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191 u = s.decode(_sysstr(encoding), _sysstr(encodingmode)) |
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192 return u.encode("utf-8") |
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193 except UnicodeDecodeError as inst: |
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194 sub = s[max(0, inst.start - 10):inst.start + 10] |
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195 raise error.Abort("decoding near '%s': %s!" % (sub, inst)) |
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196 except LookupError as k: |
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197 raise error.Abort(k, hint="please check your locale settings") |
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198 |
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199 def unitolocal(u): |
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200 """Convert a unicode string to a byte string of local encoding""" |
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201 return tolocal(u.encode('utf-8')) |
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202 |
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203 def unifromlocal(s): |
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204 """Convert a byte string of local encoding to a unicode string""" |
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205 return fromlocal(s).decode('utf-8') |
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206 |
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207 # converter functions between native str and byte string. use these if the |
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208 # character encoding is not aware (e.g. exception message) or is known to |
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209 # be locale dependent (e.g. date formatting.) |
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210 if pycompat.ispy3: |
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211 strtolocal = unitolocal |
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212 strfromlocal = unifromlocal |
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213 else: |
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214 strtolocal = pycompat.identity |
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215 strfromlocal = pycompat.identity |
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216 |
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217 if not _nativeenviron: |
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218 # now encoding and helper functions are available, recreate the environ |
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219 # dict to be exported to other modules |
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220 environ = dict((tolocal(k.encode(u'utf-8')), tolocal(v.encode(u'utf-8'))) |
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221 for k, v in os.environ.items()) |
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222 |
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223 # How to treat ambiguous-width characters. Set to 'wide' to treat as wide. |
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224 wide = (environ.get("HGENCODINGAMBIGUOUS", "narrow") == "wide" |
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225 and "WFA" or "WF") |
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226 |
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227 def colwidth(s): |
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228 "Find the column width of a string for display in the local encoding" |
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229 return ucolwidth(s.decode(_sysstr(encoding), u'replace')) |
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230 |
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231 def ucolwidth(d): |
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232 "Find the column width of a Unicode string for display" |
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233 eaw = getattr(unicodedata, 'east_asian_width', None) |
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234 if eaw is not None: |
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235 return sum([eaw(c) in wide and 2 or 1 for c in d]) |
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236 return len(d) |
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237 |
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238 def getcols(s, start, c): |
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239 '''Use colwidth to find a c-column substring of s starting at byte |
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240 index start''' |
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241 for x in xrange(start + c, len(s)): |
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242 t = s[start:x] |
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243 if colwidth(t) == c: |
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244 return t |
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245 |
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246 def trim(s, width, ellipsis='', leftside=False): |
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247 """Trim string 's' to at most 'width' columns (including 'ellipsis'). |
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248 |
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249 If 'leftside' is True, left side of string 's' is trimmed. |
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250 'ellipsis' is always placed at trimmed side. |
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251 |
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252 >>> ellipsis = '+++' |
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253 >>> from . import encoding |
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254 >>> encoding.encoding = 'utf-8' |
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255 >>> t= '1234567890' |
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256 >>> print trim(t, 12, ellipsis=ellipsis) |
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257 1234567890 |
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258 >>> print trim(t, 10, ellipsis=ellipsis) |
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259 1234567890 |
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260 >>> print trim(t, 8, ellipsis=ellipsis) |
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261 12345+++ |
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262 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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263 +++67890 |
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264 >>> print trim(t, 8) |
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265 12345678 |
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266 >>> print trim(t, 8, leftside=True) |
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267 34567890 |
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268 >>> print trim(t, 3, ellipsis=ellipsis) |
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269 +++ |
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270 >>> print trim(t, 1, ellipsis=ellipsis) |
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271 + |
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272 >>> u = u'\u3042\u3044\u3046\u3048\u304a' # 2 x 5 = 10 columns |
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273 >>> t = u.encode(encoding.encoding) |
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274 >>> print trim(t, 12, ellipsis=ellipsis) |
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275 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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276 >>> print trim(t, 10, ellipsis=ellipsis) |
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277 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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278 >>> print trim(t, 8, ellipsis=ellipsis) |
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279 \xe3\x81\x82\xe3\x81\x84+++ |
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280 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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281 +++\xe3\x81\x88\xe3\x81\x8a |
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282 >>> print trim(t, 5) |
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283 \xe3\x81\x82\xe3\x81\x84 |
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284 >>> print trim(t, 5, leftside=True) |
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285 \xe3\x81\x88\xe3\x81\x8a |
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286 >>> print trim(t, 4, ellipsis=ellipsis) |
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287 +++ |
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288 >>> print trim(t, 4, ellipsis=ellipsis, leftside=True) |
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289 +++ |
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290 >>> t = '\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa' # invalid byte sequence |
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291 >>> print trim(t, 12, ellipsis=ellipsis) |
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292 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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293 >>> print trim(t, 10, ellipsis=ellipsis) |
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294 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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295 >>> print trim(t, 8, ellipsis=ellipsis) |
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296 \x11\x22\x33\x44\x55+++ |
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297 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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298 +++\x66\x77\x88\x99\xaa |
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299 >>> print trim(t, 8) |
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300 \x11\x22\x33\x44\x55\x66\x77\x88 |
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301 >>> print trim(t, 8, leftside=True) |
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302 \x33\x44\x55\x66\x77\x88\x99\xaa |
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303 >>> print trim(t, 3, ellipsis=ellipsis) |
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304 +++ |
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305 >>> print trim(t, 1, ellipsis=ellipsis) |
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306 + |
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307 """ |
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308 try: |
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309 u = s.decode(_sysstr(encoding)) |
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310 except UnicodeDecodeError: |
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311 if len(s) <= width: # trimming is not needed |
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312 return s |
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313 width -= len(ellipsis) |
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314 if width <= 0: # no enough room even for ellipsis |
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315 return ellipsis[:width + len(ellipsis)] |
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316 if leftside: |
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317 return ellipsis + s[-width:] |
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318 return s[:width] + ellipsis |
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319 |
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320 if ucolwidth(u) <= width: # trimming is not needed |
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321 return s |
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322 |
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323 width -= len(ellipsis) |
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324 if width <= 0: # no enough room even for ellipsis |
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325 return ellipsis[:width + len(ellipsis)] |
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326 |
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327 if leftside: |
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328 uslice = lambda i: u[i:] |
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329 concat = lambda s: ellipsis + s |
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330 else: |
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331 uslice = lambda i: u[:-i] |
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332 concat = lambda s: s + ellipsis |
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333 for i in xrange(1, len(u)): |
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334 usub = uslice(i) |
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335 if ucolwidth(usub) <= width: |
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336 return concat(usub.encode(_sysstr(encoding))) |
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337 return ellipsis # no enough room for multi-column characters |
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338 |
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339 def _asciilower(s): |
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340 '''convert a string to lowercase if ASCII |
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341 |
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342 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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343 s.decode('ascii') |
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344 return s.lower() |
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345 |
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346 def asciilower(s): |
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347 # delay importing avoids cyclic dependency around "parsers" in |
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348 # pure Python build (util => i18n => encoding => parsers => util) |
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349 from . import parsers |
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350 impl = getattr(parsers, 'asciilower', _asciilower) |
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351 global asciilower |
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352 asciilower = impl |
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353 return impl(s) |
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354 |
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355 def _asciiupper(s): |
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356 '''convert a string to uppercase if ASCII |
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357 |
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358 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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359 s.decode('ascii') |
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360 return s.upper() |
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361 |
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362 def asciiupper(s): |
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363 # delay importing avoids cyclic dependency around "parsers" in |
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364 # pure Python build (util => i18n => encoding => parsers => util) |
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365 from . import parsers |
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366 impl = getattr(parsers, 'asciiupper', _asciiupper) |
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367 global asciiupper |
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368 asciiupper = impl |
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369 return impl(s) |
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370 |
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371 def lower(s): |
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372 "best-effort encoding-aware case-folding of local string s" |
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373 try: |
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374 return asciilower(s) |
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375 except UnicodeDecodeError: |
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376 pass |
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377 try: |
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378 if isinstance(s, localstr): |
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379 u = s._utf8.decode("utf-8") |
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380 else: |
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381 u = s.decode(_sysstr(encoding), _sysstr(encodingmode)) |
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382 |
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383 lu = u.lower() |
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384 if u == lu: |
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385 return s # preserve localstring |
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386 return lu.encode(_sysstr(encoding)) |
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387 except UnicodeError: |
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388 return s.lower() # we don't know how to fold this except in ASCII |
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389 except LookupError as k: |
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390 raise error.Abort(k, hint="please check your locale settings") |
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391 |
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392 def upper(s): |
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393 "best-effort encoding-aware case-folding of local string s" |
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394 try: |
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395 return asciiupper(s) |
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396 except UnicodeDecodeError: |
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397 return upperfallback(s) |
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398 |
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399 def upperfallback(s): |
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400 try: |
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401 if isinstance(s, localstr): |
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402 u = s._utf8.decode("utf-8") |
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403 else: |
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404 u = s.decode(_sysstr(encoding), _sysstr(encodingmode)) |
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405 |
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406 uu = u.upper() |
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407 if u == uu: |
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408 return s # preserve localstring |
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409 return uu.encode(_sysstr(encoding)) |
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410 except UnicodeError: |
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411 return s.upper() # we don't know how to fold this except in ASCII |
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412 except LookupError as k: |
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413 raise error.Abort(k, hint="please check your locale settings") |
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414 |
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415 class normcasespecs(object): |
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416 '''what a platform's normcase does to ASCII strings |
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417 |
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418 This is specified per platform, and should be consistent with what normcase |
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419 on that platform actually does. |
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420 |
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421 lower: normcase lowercases ASCII strings |
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422 upper: normcase uppercases ASCII strings |
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423 other: the fallback function should always be called |
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424 |
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425 This should be kept in sync with normcase_spec in util.h.''' |
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426 lower = -1 |
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427 upper = 1 |
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428 other = 0 |
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429 |
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430 _jsonmap = [] |
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431 _jsonmap.extend("\\u%04x" % x for x in range(32)) |
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432 _jsonmap.extend(chr(x) for x in range(32, 127)) |
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433 _jsonmap.append('\\u007f') |
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434 _jsonmap[0x09] = '\\t' |
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435 _jsonmap[0x0a] = '\\n' |
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436 _jsonmap[0x22] = '\\"' |
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437 _jsonmap[0x5c] = '\\\\' |
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438 _jsonmap[0x08] = '\\b' |
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439 _jsonmap[0x0c] = '\\f' |
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440 _jsonmap[0x0d] = '\\r' |
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441 _paranoidjsonmap = _jsonmap[:] |
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442 _paranoidjsonmap[0x3c] = '\\u003c' # '<' (e.g. escape "</script>") |
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443 _paranoidjsonmap[0x3e] = '\\u003e' # '>' |
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444 _jsonmap.extend(chr(x) for x in range(128, 256)) |
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445 |
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446 def jsonescape(s, paranoid=False): |
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447 '''returns a string suitable for JSON |
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448 |
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449 JSON is problematic for us because it doesn't support non-Unicode |
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450 bytes. To deal with this, we take the following approach: |
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451 |
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452 - localstr objects are converted back to UTF-8 |
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453 - valid UTF-8/ASCII strings are passed as-is |
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454 - other strings are converted to UTF-8b surrogate encoding |
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455 - apply JSON-specified string escaping |
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456 |
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457 (escapes are doubled in these tests) |
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458 |
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459 >>> jsonescape('this is a test') |
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460 'this is a test' |
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461 >>> jsonescape('escape characters: \\0 \\x0b \\x7f') |
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462 'escape characters: \\\\u0000 \\\\u000b \\\\u007f' |
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463 >>> jsonescape('escape characters: \\t \\n \\r \\" \\\\') |
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464 'escape characters: \\\\t \\\\n \\\\r \\\\" \\\\\\\\' |
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465 >>> jsonescape('a weird byte: \\xdd') |
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466 'a weird byte: \\xed\\xb3\\x9d' |
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467 >>> jsonescape('utf-8: caf\\xc3\\xa9') |
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468 'utf-8: caf\\xc3\\xa9' |
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469 >>> jsonescape('') |
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470 '' |
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471 |
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472 If paranoid, non-ascii and common troublesome characters are also escaped. |
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473 This is suitable for web output. |
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474 |
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475 >>> jsonescape('escape boundary: \\x7e \\x7f \\xc2\\x80', paranoid=True) |
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476 'escape boundary: ~ \\\\u007f \\\\u0080' |
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477 >>> jsonescape('a weird byte: \\xdd', paranoid=True) |
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478 'a weird byte: \\\\udcdd' |
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479 >>> jsonescape('utf-8: caf\\xc3\\xa9', paranoid=True) |
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480 'utf-8: caf\\\\u00e9' |
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481 >>> jsonescape('non-BMP: \\xf0\\x9d\\x84\\x9e', paranoid=True) |
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482 'non-BMP: \\\\ud834\\\\udd1e' |
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483 >>> jsonescape('<foo@example.org>', paranoid=True) |
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484 '\\\\u003cfoo@example.org\\\\u003e' |
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485 ''' |
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486 |
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487 if paranoid: |
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488 jm = _paranoidjsonmap |
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489 else: |
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490 jm = _jsonmap |
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491 |
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492 u8chars = toutf8b(s) |
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493 try: |
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494 return ''.join(jm[x] for x in bytearray(u8chars)) # fast path |
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495 except IndexError: |
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496 pass |
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497 # non-BMP char is represented as UTF-16 surrogate pair |
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498 u16codes = array.array('H', u8chars.decode('utf-8').encode('utf-16')) |
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499 u16codes.pop(0) # drop BOM |
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500 return ''.join(jm[x] if x < 128 else '\\u%04x' % x for x in u16codes) |
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501 |
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502 _utf8len = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 4] |
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503 |
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504 def getutf8char(s, pos): |
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505 '''get the next full utf-8 character in the given string, starting at pos |
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506 |
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507 Raises a UnicodeError if the given location does not start a valid |
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508 utf-8 character. |
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509 ''' |
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510 |
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511 # find how many bytes to attempt decoding from first nibble |
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512 l = _utf8len[ord(s[pos]) >> 4] |
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513 if not l: # ascii |
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514 return s[pos] |
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515 |
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516 c = s[pos:pos + l] |
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517 # validate with attempted decode |
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518 c.decode("utf-8") |
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519 return c |
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520 |
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521 def toutf8b(s): |
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522 '''convert a local, possibly-binary string into UTF-8b |
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523 |
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524 This is intended as a generic method to preserve data when working |
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525 with schemes like JSON and XML that have no provision for |
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526 arbitrary byte strings. As Mercurial often doesn't know |
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527 what encoding data is in, we use so-called UTF-8b. |
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528 |
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529 If a string is already valid UTF-8 (or ASCII), it passes unmodified. |
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530 Otherwise, unsupported bytes are mapped to UTF-16 surrogate range, |
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531 uDC00-uDCFF. |
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532 |
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533 Principles of operation: |
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534 |
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535 - ASCII and UTF-8 data successfully round-trips and is understood |
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536 by Unicode-oriented clients |
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537 - filenames and file contents in arbitrary other encodings can have |
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538 be round-tripped or recovered by clueful clients |
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539 - local strings that have a cached known UTF-8 encoding (aka |
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540 localstr) get sent as UTF-8 so Unicode-oriented clients get the |
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541 Unicode data they want |
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542 - because we must preserve UTF-8 bytestring in places such as |
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543 filenames, metadata can't be roundtripped without help |
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544 |
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545 (Note: "UTF-8b" often refers to decoding a mix of valid UTF-8 and |
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546 arbitrary bytes into an internal Unicode format that can be |
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547 re-encoded back into the original. Here we are exposing the |
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548 internal surrogate encoding as a UTF-8 string.) |
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549 ''' |
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550 |
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551 if "\xed" not in s: |
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552 if isinstance(s, localstr): |
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553 return s._utf8 |
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554 try: |
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555 s.decode('utf-8') |
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556 return s |
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557 except UnicodeDecodeError: |
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558 pass |
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559 |
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560 r = "" |
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561 pos = 0 |
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562 l = len(s) |
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563 while pos < l: |
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564 try: |
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565 c = getutf8char(s, pos) |
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566 if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf": |
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567 # have to re-escape existing U+DCxx characters |
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568 c = unichr(0xdc00 + ord(s[pos])).encode('utf-8') |
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569 pos += 1 |
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570 else: |
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571 pos += len(c) |
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572 except UnicodeDecodeError: |
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573 c = unichr(0xdc00 + ord(s[pos])).encode('utf-8') |
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574 pos += 1 |
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575 r += c |
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576 return r |
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577 |
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578 def fromutf8b(s): |
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579 '''Given a UTF-8b string, return a local, possibly-binary string. |
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580 |
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581 return the original binary string. This |
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582 is a round-trip process for strings like filenames, but metadata |
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583 that's was passed through tolocal will remain in UTF-8. |
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584 |
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585 >>> roundtrip = lambda x: fromutf8b(toutf8b(x)) == x |
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586 >>> m = "\\xc3\\xa9\\x99abcd" |
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587 >>> toutf8b(m) |
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588 '\\xc3\\xa9\\xed\\xb2\\x99abcd' |
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589 >>> roundtrip(m) |
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590 True |
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591 >>> roundtrip("\\xc2\\xc2\\x80") |
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592 True |
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593 >>> roundtrip("\\xef\\xbf\\xbd") |
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594 True |
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595 >>> roundtrip("\\xef\\xef\\xbf\\xbd") |
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596 True |
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597 >>> roundtrip("\\xf1\\x80\\x80\\x80\\x80") |
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598 True |
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599 ''' |
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600 |
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601 # fast path - look for uDxxx prefixes in s |
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602 if "\xed" not in s: |
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603 return s |
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604 |
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605 # We could do this with the unicode type but some Python builds |
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606 # use UTF-16 internally (issue5031) which causes non-BMP code |
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607 # points to be escaped. Instead, we use our handy getutf8char |
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608 # helper again to walk the string without "decoding" it. |
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609 |
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610 r = "" |
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611 pos = 0 |
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612 l = len(s) |
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613 while pos < l: |
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614 c = getutf8char(s, pos) |
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615 pos += len(c) |
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616 # unescape U+DCxx characters |
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617 if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf": |
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618 c = chr(ord(c.decode("utf-8")) & 0xff) |
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619 r += c |
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620 return r |