Mercurial > hg
annotate mercurial/encoding.py @ 30801:67ee7874e53b
revset: factor out getinteger() helper
We have 4 revset functions that take integer arguments, and they handle
their arguments in slightly different ways. This patch unifies them:
- getstring() in place of getsymbol(), which is more consistent with the
handling of integer revisions (both 1 and '1' are valid)
- say "expects" instead of "requires" for type errors
We don't need to catch TypeError since getstring() must return a string.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Mon, 09 Jan 2017 17:39:44 +0900 |
parents | ce36fa9b140c |
children | 067add650129 |
rev | line source |
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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 |
10263 | 6 # GNU General Public License version 2 or any later version. |
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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 if not _nativeenviron: |
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200 # now encoding and helper functions are available, recreate the environ |
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201 # dict to be exported to other modules |
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202 environ = dict((tolocal(k.encode(u'utf-8')), tolocal(v.encode(u'utf-8'))) |
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203 for k, v in os.environ.items()) |
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204 |
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205 # How to treat ambiguous-width characters. Set to 'wide' to treat as wide. |
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206 wide = (environ.get("HGENCODINGAMBIGUOUS", "narrow") == "wide" |
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207 and "WFA" or "WF") |
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208 |
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209 def colwidth(s): |
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210 "Find the column width of a string for display in the local encoding" |
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211 return ucolwidth(s.decode(_sysstr(encoding), u'replace')) |
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212 |
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213 def ucolwidth(d): |
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214 "Find the column width of a Unicode string for display" |
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215 eaw = getattr(unicodedata, 'east_asian_width', None) |
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216 if eaw is not None: |
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217 return sum([eaw(c) in wide and 2 or 1 for c in d]) |
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218 return len(d) |
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219 |
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220 def getcols(s, start, c): |
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221 '''Use colwidth to find a c-column substring of s starting at byte |
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222 index start''' |
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223 for x in xrange(start + c, len(s)): |
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224 t = s[start:x] |
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225 if colwidth(t) == c: |
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226 return t |
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227 |
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228 def trim(s, width, ellipsis='', leftside=False): |
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229 """Trim string 's' to at most 'width' columns (including 'ellipsis'). |
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230 |
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231 If 'leftside' is True, left side of string 's' is trimmed. |
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232 'ellipsis' is always placed at trimmed side. |
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233 |
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234 >>> ellipsis = '+++' |
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235 >>> from . import encoding |
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236 >>> encoding.encoding = 'utf-8' |
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237 >>> t= '1234567890' |
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238 >>> print trim(t, 12, ellipsis=ellipsis) |
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239 1234567890 |
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240 >>> print trim(t, 10, ellipsis=ellipsis) |
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241 1234567890 |
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242 >>> print trim(t, 8, ellipsis=ellipsis) |
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243 12345+++ |
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244 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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245 +++67890 |
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246 >>> print trim(t, 8) |
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247 12345678 |
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248 >>> print trim(t, 8, leftside=True) |
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249 34567890 |
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250 >>> print trim(t, 3, ellipsis=ellipsis) |
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251 +++ |
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252 >>> print trim(t, 1, ellipsis=ellipsis) |
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253 + |
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254 >>> u = u'\u3042\u3044\u3046\u3048\u304a' # 2 x 5 = 10 columns |
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255 >>> t = u.encode(encoding.encoding) |
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256 >>> print trim(t, 12, ellipsis=ellipsis) |
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257 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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258 >>> print trim(t, 10, ellipsis=ellipsis) |
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259 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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260 >>> print trim(t, 8, ellipsis=ellipsis) |
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261 \xe3\x81\x82\xe3\x81\x84+++ |
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262 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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263 +++\xe3\x81\x88\xe3\x81\x8a |
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264 >>> print trim(t, 5) |
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265 \xe3\x81\x82\xe3\x81\x84 |
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266 >>> print trim(t, 5, leftside=True) |
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267 \xe3\x81\x88\xe3\x81\x8a |
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268 >>> print trim(t, 4, ellipsis=ellipsis) |
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269 +++ |
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270 >>> print trim(t, 4, ellipsis=ellipsis, leftside=True) |
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271 +++ |
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272 >>> t = '\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa' # invalid byte sequence |
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273 >>> print trim(t, 12, ellipsis=ellipsis) |
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274 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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275 >>> print trim(t, 10, ellipsis=ellipsis) |
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276 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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277 >>> print trim(t, 8, ellipsis=ellipsis) |
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278 \x11\x22\x33\x44\x55+++ |
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279 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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280 +++\x66\x77\x88\x99\xaa |
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281 >>> print trim(t, 8) |
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282 \x11\x22\x33\x44\x55\x66\x77\x88 |
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283 >>> print trim(t, 8, leftside=True) |
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284 \x33\x44\x55\x66\x77\x88\x99\xaa |
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285 >>> print trim(t, 3, ellipsis=ellipsis) |
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286 +++ |
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287 >>> print trim(t, 1, ellipsis=ellipsis) |
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288 + |
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289 """ |
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290 try: |
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291 u = s.decode(_sysstr(encoding)) |
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292 except UnicodeDecodeError: |
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293 if len(s) <= width: # trimming is not needed |
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294 return s |
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295 width -= len(ellipsis) |
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296 if width <= 0: # no enough room even for ellipsis |
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297 return ellipsis[:width + len(ellipsis)] |
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298 if leftside: |
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299 return ellipsis + s[-width:] |
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300 return s[:width] + ellipsis |
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301 |
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302 if ucolwidth(u) <= width: # trimming is not needed |
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303 return s |
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304 |
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305 width -= len(ellipsis) |
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306 if width <= 0: # no enough room even for ellipsis |
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307 return ellipsis[:width + len(ellipsis)] |
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308 |
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309 if leftside: |
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310 uslice = lambda i: u[i:] |
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311 concat = lambda s: ellipsis + s |
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312 else: |
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313 uslice = lambda i: u[:-i] |
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314 concat = lambda s: s + ellipsis |
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315 for i in xrange(1, len(u)): |
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316 usub = uslice(i) |
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317 if ucolwidth(usub) <= width: |
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318 return concat(usub.encode(_sysstr(encoding))) |
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319 return ellipsis # no enough room for multi-column characters |
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320 |
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321 def _asciilower(s): |
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322 '''convert a string to lowercase if ASCII |
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323 |
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324 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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325 s.decode('ascii') |
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326 return s.lower() |
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327 |
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328 def asciilower(s): |
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329 # delay importing avoids cyclic dependency around "parsers" in |
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330 # pure Python build (util => i18n => encoding => parsers => util) |
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331 from . import parsers |
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332 impl = getattr(parsers, 'asciilower', _asciilower) |
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333 global asciilower |
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334 asciilower = impl |
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335 return impl(s) |
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336 |
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337 def _asciiupper(s): |
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338 '''convert a string to uppercase if ASCII |
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339 |
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340 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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341 s.decode('ascii') |
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342 return s.upper() |
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343 |
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344 def asciiupper(s): |
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345 # delay importing avoids cyclic dependency around "parsers" in |
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346 # pure Python build (util => i18n => encoding => parsers => util) |
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347 from . import parsers |
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348 impl = getattr(parsers, 'asciiupper', _asciiupper) |
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349 global asciiupper |
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350 asciiupper = impl |
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351 return impl(s) |
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352 |
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353 def lower(s): |
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354 "best-effort encoding-aware case-folding of local string s" |
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355 try: |
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356 return asciilower(s) |
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357 except UnicodeDecodeError: |
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358 pass |
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359 try: |
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360 if isinstance(s, localstr): |
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361 u = s._utf8.decode("utf-8") |
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362 else: |
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363 u = s.decode(_sysstr(encoding), _sysstr(encodingmode)) |
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364 |
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365 lu = u.lower() |
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366 if u == lu: |
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367 return s # preserve localstring |
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368 return lu.encode(_sysstr(encoding)) |
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369 except UnicodeError: |
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370 return s.lower() # we don't know how to fold this except in ASCII |
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371 except LookupError as k: |
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372 raise error.Abort(k, hint="please check your locale settings") |
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373 |
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374 def upper(s): |
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375 "best-effort encoding-aware case-folding of local string s" |
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376 try: |
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377 return asciiupper(s) |
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378 except UnicodeDecodeError: |
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379 return upperfallback(s) |
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380 |
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381 def upperfallback(s): |
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382 try: |
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383 if isinstance(s, localstr): |
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384 u = s._utf8.decode("utf-8") |
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385 else: |
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386 u = s.decode(_sysstr(encoding), _sysstr(encodingmode)) |
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387 |
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388 uu = u.upper() |
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389 if u == uu: |
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390 return s # preserve localstring |
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391 return uu.encode(_sysstr(encoding)) |
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392 except UnicodeError: |
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393 return s.upper() # we don't know how to fold this except in ASCII |
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394 except LookupError as k: |
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395 raise error.Abort(k, hint="please check your locale settings") |
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396 |
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397 class normcasespecs(object): |
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398 '''what a platform's normcase does to ASCII strings |
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399 |
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400 This is specified per platform, and should be consistent with what normcase |
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401 on that platform actually does. |
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402 |
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403 lower: normcase lowercases ASCII strings |
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404 upper: normcase uppercases ASCII strings |
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405 other: the fallback function should always be called |
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406 |
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407 This should be kept in sync with normcase_spec in util.h.''' |
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408 lower = -1 |
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409 upper = 1 |
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410 other = 0 |
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411 |
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412 _jsonmap = [] |
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413 _jsonmap.extend("\\u%04x" % x for x in range(32)) |
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414 _jsonmap.extend(chr(x) for x in range(32, 127)) |
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415 _jsonmap.append('\\u007f') |
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416 _jsonmap[0x09] = '\\t' |
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417 _jsonmap[0x0a] = '\\n' |
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418 _jsonmap[0x22] = '\\"' |
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419 _jsonmap[0x5c] = '\\\\' |
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420 _jsonmap[0x08] = '\\b' |
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421 _jsonmap[0x0c] = '\\f' |
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422 _jsonmap[0x0d] = '\\r' |
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423 _paranoidjsonmap = _jsonmap[:] |
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424 _paranoidjsonmap[0x3c] = '\\u003c' # '<' (e.g. escape "</script>") |
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425 _paranoidjsonmap[0x3e] = '\\u003e' # '>' |
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426 _jsonmap.extend(chr(x) for x in range(128, 256)) |
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427 |
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428 def jsonescape(s, paranoid=False): |
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429 '''returns a string suitable for JSON |
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430 |
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431 JSON is problematic for us because it doesn't support non-Unicode |
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432 bytes. To deal with this, we take the following approach: |
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433 |
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434 - localstr objects are converted back to UTF-8 |
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|
435 - valid UTF-8/ASCII strings are passed as-is |
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changeset
|
436 - other strings are converted to UTF-8b surrogate encoding |
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diff
changeset
|
437 - apply JSON-specified string escaping |
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encoding: add json escaping filter
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parents:
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diff
changeset
|
438 |
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encoding: add json escaping filter
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parents:
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diff
changeset
|
439 (escapes are doubled in these tests) |
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encoding: add json escaping filter
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parents:
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diff
changeset
|
440 |
f6b533e64ed6
encoding: add json escaping filter
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parents:
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diff
changeset
|
441 >>> jsonescape('this is a test') |
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encoding: add json escaping filter
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diff
changeset
|
442 'this is a test' |
27881
ffa599f3f503
encoding: escape U+007F (DEL) character in JSON
Yuya Nishihara <yuya@tcha.org>
parents:
27699
diff
changeset
|
443 >>> jsonescape('escape characters: \\0 \\x0b \\x7f') |
ffa599f3f503
encoding: escape U+007F (DEL) character in JSON
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parents:
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diff
changeset
|
444 'escape characters: \\\\u0000 \\\\u000b \\\\u007f' |
ffa599f3f503
encoding: escape U+007F (DEL) character in JSON
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parents:
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diff
changeset
|
445 >>> jsonescape('escape characters: \\t \\n \\r \\" \\\\') |
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encoding: escape U+007F (DEL) character in JSON
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parents:
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diff
changeset
|
446 'escape characters: \\\\t \\\\n \\\\r \\\\" \\\\\\\\' |
22426
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encoding: add json escaping filter
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parents:
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diff
changeset
|
447 >>> jsonescape('a weird byte: \\xdd') |
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encoding: add json escaping filter
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diff
changeset
|
448 'a weird byte: \\xed\\xb3\\x9d' |
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encoding: add json escaping filter
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diff
changeset
|
449 >>> jsonescape('utf-8: caf\\xc3\\xa9') |
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diff
changeset
|
450 'utf-8: caf\\xc3\\xa9' |
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encoding: add json escaping filter
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parents:
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diff
changeset
|
451 >>> jsonescape('') |
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encoding: add json escaping filter
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diff
changeset
|
452 '' |
28068
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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parents:
28067
diff
changeset
|
453 |
28069
b2d24c2898f9
encoding: backport paranoid escaping from templatefilters.jsonescape()
Yuya Nishihara <yuya@tcha.org>
parents:
28068
diff
changeset
|
454 If paranoid, non-ascii and common troublesome characters are also escaped. |
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encoding: backport paranoid escaping from templatefilters.jsonescape()
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diff
changeset
|
455 This is suitable for web output. |
28068
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encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
456 |
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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diff
changeset
|
457 >>> jsonescape('escape boundary: \\x7e \\x7f \\xc2\\x80', paranoid=True) |
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diff
changeset
|
458 'escape boundary: ~ \\\\u007f \\\\u0080' |
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encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
459 >>> jsonescape('a weird byte: \\xdd', paranoid=True) |
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diff
changeset
|
460 'a weird byte: \\\\udcdd' |
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diff
changeset
|
461 >>> jsonescape('utf-8: caf\\xc3\\xa9', paranoid=True) |
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diff
changeset
|
462 'utf-8: caf\\\\u00e9' |
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diff
changeset
|
463 >>> jsonescape('non-BMP: \\xf0\\x9d\\x84\\x9e', paranoid=True) |
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parents:
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diff
changeset
|
464 'non-BMP: \\\\ud834\\\\udd1e' |
28069
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encoding: backport paranoid escaping from templatefilters.jsonescape()
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diff
changeset
|
465 >>> jsonescape('<foo@example.org>', paranoid=True) |
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encoding: backport paranoid escaping from templatefilters.jsonescape()
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diff
changeset
|
466 '\\\\u003cfoo@example.org\\\\u003e' |
22426
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encoding: add json escaping filter
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parents:
22425
diff
changeset
|
467 ''' |
f6b533e64ed6
encoding: add json escaping filter
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parents:
22425
diff
changeset
|
468 |
28068
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents:
28067
diff
changeset
|
469 if paranoid: |
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diff
changeset
|
470 jm = _paranoidjsonmap |
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encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
471 else: |
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encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
472 jm = _jsonmap |
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encoding: add option to escape non-ascii characters in JSON
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diff
changeset
|
473 |
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
474 u8chars = toutf8b(s) |
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encoding: add option to escape non-ascii characters in JSON
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diff
changeset
|
475 try: |
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
476 return ''.join(jm[x] for x in bytearray(u8chars)) # fast path |
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
477 except IndexError: |
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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diff
changeset
|
478 pass |
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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parents:
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diff
changeset
|
479 # non-BMP char is represented as UTF-16 surrogate pair |
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diff
changeset
|
480 u16codes = array.array('H', u8chars.decode('utf-8').encode('utf-16')) |
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encoding: add option to escape non-ascii characters in JSON
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diff
changeset
|
481 u16codes.pop(0) # drop BOM |
9ece901f7a19
encoding: add option to escape non-ascii characters in JSON
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diff
changeset
|
482 return ''.join(jm[x] if x < 128 else '\\u%04x' % x for x in u16codes) |
22426
f6b533e64ed6
encoding: add json escaping filter
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parents:
22425
diff
changeset
|
483 |
26875
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
484 _utf8len = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 4] |
cf47bdb2183c
encoding: add getutf8char helper
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parents:
25660
diff
changeset
|
485 |
cf47bdb2183c
encoding: add getutf8char helper
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parents:
25660
diff
changeset
|
486 def getutf8char(s, pos): |
cf47bdb2183c
encoding: add getutf8char helper
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diff
changeset
|
487 '''get the next full utf-8 character in the given string, starting at pos |
cf47bdb2183c
encoding: add getutf8char helper
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parents:
25660
diff
changeset
|
488 |
cf47bdb2183c
encoding: add getutf8char helper
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25660
diff
changeset
|
489 Raises a UnicodeError if the given location does not start a valid |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
490 utf-8 character. |
cf47bdb2183c
encoding: add getutf8char helper
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parents:
25660
diff
changeset
|
491 ''' |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
492 |
cf47bdb2183c
encoding: add getutf8char helper
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parents:
25660
diff
changeset
|
493 # find how many bytes to attempt decoding from first nibble |
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encoding: add getutf8char helper
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diff
changeset
|
494 l = _utf8len[ord(s[pos]) >> 4] |
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encoding: add getutf8char helper
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parents:
25660
diff
changeset
|
495 if not l: # ascii |
cf47bdb2183c
encoding: add getutf8char helper
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parents:
25660
diff
changeset
|
496 return s[pos] |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
497 |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
498 c = s[pos:pos + l] |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
499 # validate with attempted decode |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
500 c.decode("utf-8") |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
501 return c |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
502 |
16133
84c58da3a1f8
encoding: introduce utf8-b helpers
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parents:
15769
diff
changeset
|
503 def toutf8b(s): |
84c58da3a1f8
encoding: introduce utf8-b helpers
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parents:
15769
diff
changeset
|
504 '''convert a local, possibly-binary string into UTF-8b |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
505 |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
506 This is intended as a generic method to preserve data when working |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
507 with schemes like JSON and XML that have no provision for |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
508 arbitrary byte strings. As Mercurial often doesn't know |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
509 what encoding data is in, we use so-called UTF-8b. |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
510 |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
511 If a string is already valid UTF-8 (or ASCII), it passes unmodified. |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
512 Otherwise, unsupported bytes are mapped to UTF-16 surrogate range, |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
513 uDC00-uDCFF. |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
514 |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
515 Principles of operation: |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
516 |
17424
e7cfe3587ea4
fix trivial spelling errors
Mads Kiilerich <mads@kiilerich.com>
parents:
17236
diff
changeset
|
517 - ASCII and UTF-8 data successfully round-trips and is understood |
16133
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
518 by Unicode-oriented clients |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
519 - filenames and file contents in arbitrary other encodings can have |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
520 be round-tripped or recovered by clueful clients |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
521 - local strings that have a cached known UTF-8 encoding (aka |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
522 localstr) get sent as UTF-8 so Unicode-oriented clients get the |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
523 Unicode data they want |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
524 - because we must preserve UTF-8 bytestring in places such as |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
525 filenames, metadata can't be roundtripped without help |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
526 |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
527 (Note: "UTF-8b" often refers to decoding a mix of valid UTF-8 and |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
528 arbitrary bytes into an internal Unicode format that can be |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
529 re-encoded back into the original. Here we are exposing the |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
530 internal surrogate encoding as a UTF-8 string.) |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
531 ''' |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
532 |
26879
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
533 if "\xed" not in s: |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
534 if isinstance(s, localstr): |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
535 return s._utf8 |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
536 try: |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
537 s.decode('utf-8') |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
538 return s |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
539 except UnicodeDecodeError: |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
540 pass |
26878
d7e83f106459
encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents:
26877
diff
changeset
|
541 |
d7e83f106459
encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents:
26877
diff
changeset
|
542 r = "" |
d7e83f106459
encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents:
26877
diff
changeset
|
543 pos = 0 |
d7e83f106459
encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents:
26877
diff
changeset
|
544 l = len(s) |
d7e83f106459
encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents:
26877
diff
changeset
|
545 while pos < l: |
d7e83f106459
encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents:
26877
diff
changeset
|
546 try: |
d7e83f106459
encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents:
26877
diff
changeset
|
547 c = getutf8char(s, pos) |
26879
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
548 if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf": |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
549 # have to re-escape existing U+DCxx characters |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
550 c = unichr(0xdc00 + ord(s[pos])).encode('utf-8') |
a24b98f4e03c
encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents:
26878
diff
changeset
|
551 pos += 1 |
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552 else: |
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553 pos += len(c) |
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554 except UnicodeDecodeError: |
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555 c = unichr(0xdc00 + ord(s[pos])).encode('utf-8') |
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556 pos += 1 |
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557 r += c |
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558 return r |
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559 |
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560 def fromutf8b(s): |
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561 '''Given a UTF-8b string, return a local, possibly-binary string. |
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562 |
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563 return the original binary string. This |
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564 is a round-trip process for strings like filenames, but metadata |
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565 that's was passed through tolocal will remain in UTF-8. |
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566 |
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567 >>> roundtrip = lambda x: fromutf8b(toutf8b(x)) == x |
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568 >>> m = "\\xc3\\xa9\\x99abcd" |
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569 >>> toutf8b(m) |
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570 '\\xc3\\xa9\\xed\\xb2\\x99abcd' |
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571 >>> roundtrip(m) |
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572 True |
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573 >>> roundtrip("\\xc2\\xc2\\x80") |
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574 True |
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575 >>> roundtrip("\\xef\\xbf\\xbd") |
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576 True |
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577 >>> roundtrip("\\xef\\xef\\xbf\\xbd") |
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578 True |
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579 >>> roundtrip("\\xf1\\x80\\x80\\x80\\x80") |
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580 True |
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581 ''' |
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582 |
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583 # fast path - look for uDxxx prefixes in s |
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584 if "\xed" not in s: |
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585 return s |
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586 |
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587 # We could do this with the unicode type but some Python builds |
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588 # use UTF-16 internally (issue5031) which causes non-BMP code |
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589 # points to be escaped. Instead, we use our handy getutf8char |
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590 # helper again to walk the string without "decoding" it. |
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591 |
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592 r = "" |
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593 pos = 0 |
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594 l = len(s) |
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595 while pos < l: |
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596 c = getutf8char(s, pos) |
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597 pos += len(c) |
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598 # unescape U+DCxx characters |
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599 if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf": |
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600 c = chr(ord(c.decode("utf-8")) & 0xff) |
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601 r += c |
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602 return r |