Mercurial > hg
annotate mercurial/encoding.py @ 26636:ff6baf32b3ba
revset: eliminate temporary reference to subset in limit() and last()
author | Yuya Nishihara <yuya@tcha.org> |
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date | Mon, 12 Oct 2015 17:14:47 +0900 |
parents | 328739ea70c3 |
children | cf47bdb2183c |
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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 import error |
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9 import unicodedata, locale, os |
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10 |
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11 # These unicode characters are ignored by HFS+ (Apple Technote 1150, |
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12 # "Unicode Subtleties"), so we need to ignore them in some places for |
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13 # sanity. |
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14 _ignore = [unichr(int(x, 16)).encode("utf-8") for x in |
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15 "200c 200d 200e 200f 202a 202b 202c 202d 202e " |
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16 "206a 206b 206c 206d 206e 206f feff".split()] |
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17 # verify the next function will work |
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18 assert set([i[0] for i in _ignore]) == set(["\xe2", "\xef"]) |
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19 |
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20 def hfsignoreclean(s): |
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21 """Remove codepoints ignored by HFS+ from s. |
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22 |
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23 >>> hfsignoreclean(u'.h\u200cg'.encode('utf-8')) |
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24 '.hg' |
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25 >>> hfsignoreclean(u'.h\ufeffg'.encode('utf-8')) |
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26 '.hg' |
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27 """ |
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28 if "\xe2" in s or "\xef" in s: |
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29 for c in _ignore: |
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30 s = s.replace(c, '') |
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31 return s |
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32 |
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33 def _getpreferredencoding(): |
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34 ''' |
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35 On darwin, getpreferredencoding ignores the locale environment and |
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36 always returns mac-roman. http://bugs.python.org/issue6202 fixes this |
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37 for Python 2.7 and up. This is the same corrected code for earlier |
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38 Python versions. |
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39 |
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40 However, we can't use a version check for this method, as some distributions |
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41 patch Python to fix this. Instead, we use it as a 'fixer' for the mac-roman |
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42 encoding, as it is unlikely that this encoding is the actually expected. |
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43 ''' |
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44 try: |
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45 locale.CODESET |
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46 except AttributeError: |
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47 # Fall back to parsing environment variables :-( |
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48 return locale.getdefaultlocale()[1] |
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49 |
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50 oldloc = locale.setlocale(locale.LC_CTYPE) |
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51 locale.setlocale(locale.LC_CTYPE, "") |
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52 result = locale.nl_langinfo(locale.CODESET) |
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53 locale.setlocale(locale.LC_CTYPE, oldloc) |
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54 |
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55 return result |
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56 |
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57 _encodingfixers = { |
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58 '646': lambda: 'ascii', |
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59 'ANSI_X3.4-1968': lambda: 'ascii', |
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60 'mac-roman': _getpreferredencoding |
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61 } |
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62 |
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63 try: |
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64 encoding = os.environ.get("HGENCODING") |
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65 if not encoding: |
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66 encoding = locale.getpreferredencoding() or 'ascii' |
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67 encoding = _encodingfixers.get(encoding, lambda: encoding)() |
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68 except locale.Error: |
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69 encoding = 'ascii' |
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70 encodingmode = os.environ.get("HGENCODINGMODE", "strict") |
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71 fallbackencoding = 'ISO-8859-1' |
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72 |
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73 class localstr(str): |
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74 '''This class allows strings that are unmodified to be |
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75 round-tripped to the local encoding and back''' |
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76 def __new__(cls, u, l): |
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77 s = str.__new__(cls, l) |
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78 s._utf8 = u |
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79 return s |
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80 def __hash__(self): |
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81 return hash(self._utf8) # avoid collisions in local string space |
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82 |
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83 def tolocal(s): |
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84 """ |
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85 Convert a string from internal UTF-8 to local encoding |
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86 |
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87 All internal strings should be UTF-8 but some repos before the |
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88 implementation of locale support may contain latin1 or possibly |
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89 other character sets. We attempt to decode everything strictly |
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90 using UTF-8, then Latin-1, and failing that, we use UTF-8 and |
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91 replace unknown characters. |
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92 |
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93 The localstr class is used to cache the known UTF-8 encoding of |
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94 strings next to their local representation to allow lossless |
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95 round-trip conversion back to UTF-8. |
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96 |
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97 >>> u = 'foo: \\xc3\\xa4' # utf-8 |
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98 >>> l = tolocal(u) |
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99 >>> l |
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100 'foo: ?' |
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101 >>> fromlocal(l) |
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102 'foo: \\xc3\\xa4' |
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103 >>> u2 = 'foo: \\xc3\\xa1' |
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104 >>> d = { l: 1, tolocal(u2): 2 } |
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105 >>> len(d) # no collision |
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106 2 |
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107 >>> 'foo: ?' in d |
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108 False |
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109 >>> l1 = 'foo: \\xe4' # historical latin1 fallback |
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110 >>> l = tolocal(l1) |
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111 >>> l |
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112 'foo: ?' |
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113 >>> fromlocal(l) # magically in utf-8 |
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114 'foo: \\xc3\\xa4' |
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115 """ |
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116 |
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117 try: |
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118 try: |
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119 # make sure string is actually stored in UTF-8 |
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120 u = s.decode('UTF-8') |
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121 if encoding == 'UTF-8': |
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122 # fast path |
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123 return s |
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124 r = u.encode(encoding, "replace") |
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125 if u == r.decode(encoding): |
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126 # r is a safe, non-lossy encoding of s |
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127 return r |
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128 return localstr(s, r) |
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129 except UnicodeDecodeError: |
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130 # we should only get here if we're looking at an ancient changeset |
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131 try: |
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132 u = s.decode(fallbackencoding) |
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133 r = u.encode(encoding, "replace") |
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134 if u == r.decode(encoding): |
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135 # r is a safe, non-lossy encoding of s |
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136 return r |
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137 return localstr(u.encode('UTF-8'), r) |
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138 except UnicodeDecodeError: |
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139 u = s.decode("utf-8", "replace") # last ditch |
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140 return u.encode(encoding, "replace") # can't round-trip |
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141 except LookupError as k: |
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142 raise error.Abort(k, hint="please check your locale settings") |
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143 |
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144 def fromlocal(s): |
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145 """ |
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146 Convert a string from the local character encoding to UTF-8 |
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147 |
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148 We attempt to decode strings using the encoding mode set by |
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149 HGENCODINGMODE, which defaults to 'strict'. In this mode, unknown |
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150 characters will cause an error message. Other modes include |
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151 'replace', which replaces unknown characters with a special |
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152 Unicode character, and 'ignore', which drops the character. |
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153 """ |
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154 |
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155 # can we do a lossless round-trip? |
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156 if isinstance(s, localstr): |
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157 return s._utf8 |
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158 |
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159 try: |
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160 return s.decode(encoding, encodingmode).encode("utf-8") |
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161 except UnicodeDecodeError as inst: |
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162 sub = s[max(0, inst.start - 10):inst.start + 10] |
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163 raise error.Abort("decoding near '%s': %s!" % (sub, inst)) |
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164 except LookupError as k: |
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165 raise error.Abort(k, hint="please check your locale settings") |
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166 |
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167 # How to treat ambiguous-width characters. Set to 'wide' to treat as wide. |
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168 wide = (os.environ.get("HGENCODINGAMBIGUOUS", "narrow") == "wide" |
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169 and "WFA" or "WF") |
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170 |
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171 def colwidth(s): |
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172 "Find the column width of a string for display in the local encoding" |
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173 return ucolwidth(s.decode(encoding, 'replace')) |
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174 |
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175 def ucolwidth(d): |
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176 "Find the column width of a Unicode string for display" |
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177 eaw = getattr(unicodedata, 'east_asian_width', None) |
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178 if eaw is not None: |
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179 return sum([eaw(c) in wide and 2 or 1 for c in d]) |
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180 return len(d) |
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181 |
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182 def getcols(s, start, c): |
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183 '''Use colwidth to find a c-column substring of s starting at byte |
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184 index start''' |
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185 for x in xrange(start + c, len(s)): |
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186 t = s[start:x] |
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187 if colwidth(t) == c: |
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188 return t |
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189 |
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190 def trim(s, width, ellipsis='', leftside=False): |
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191 """Trim string 's' to at most 'width' columns (including 'ellipsis'). |
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192 |
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193 If 'leftside' is True, left side of string 's' is trimmed. |
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194 'ellipsis' is always placed at trimmed side. |
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195 |
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196 >>> ellipsis = '+++' |
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197 >>> from mercurial import encoding |
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198 >>> encoding.encoding = 'utf-8' |
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199 >>> t= '1234567890' |
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200 >>> print trim(t, 12, ellipsis=ellipsis) |
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201 1234567890 |
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202 >>> print trim(t, 10, ellipsis=ellipsis) |
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203 1234567890 |
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204 >>> print trim(t, 8, ellipsis=ellipsis) |
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205 12345+++ |
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206 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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207 +++67890 |
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208 >>> print trim(t, 8) |
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209 12345678 |
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210 >>> print trim(t, 8, leftside=True) |
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211 34567890 |
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212 >>> print trim(t, 3, ellipsis=ellipsis) |
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213 +++ |
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214 >>> print trim(t, 1, ellipsis=ellipsis) |
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215 + |
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216 >>> u = u'\u3042\u3044\u3046\u3048\u304a' # 2 x 5 = 10 columns |
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217 >>> t = u.encode(encoding.encoding) |
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218 >>> print trim(t, 12, ellipsis=ellipsis) |
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219 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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220 >>> print trim(t, 10, ellipsis=ellipsis) |
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221 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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222 >>> print trim(t, 8, ellipsis=ellipsis) |
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223 \xe3\x81\x82\xe3\x81\x84+++ |
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224 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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225 +++\xe3\x81\x88\xe3\x81\x8a |
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226 >>> print trim(t, 5) |
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227 \xe3\x81\x82\xe3\x81\x84 |
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228 >>> print trim(t, 5, leftside=True) |
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229 \xe3\x81\x88\xe3\x81\x8a |
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230 >>> print trim(t, 4, ellipsis=ellipsis) |
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231 +++ |
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232 >>> print trim(t, 4, ellipsis=ellipsis, leftside=True) |
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233 +++ |
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234 >>> t = '\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa' # invalid byte sequence |
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235 >>> print trim(t, 12, ellipsis=ellipsis) |
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236 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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237 >>> print trim(t, 10, ellipsis=ellipsis) |
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238 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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239 >>> print trim(t, 8, ellipsis=ellipsis) |
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240 \x11\x22\x33\x44\x55+++ |
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241 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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242 +++\x66\x77\x88\x99\xaa |
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243 >>> print trim(t, 8) |
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244 \x11\x22\x33\x44\x55\x66\x77\x88 |
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245 >>> print trim(t, 8, leftside=True) |
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246 \x33\x44\x55\x66\x77\x88\x99\xaa |
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247 >>> print trim(t, 3, ellipsis=ellipsis) |
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248 +++ |
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249 >>> print trim(t, 1, ellipsis=ellipsis) |
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250 + |
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251 """ |
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252 try: |
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253 u = s.decode(encoding) |
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254 except UnicodeDecodeError: |
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255 if len(s) <= width: # trimming is not needed |
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256 return s |
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257 width -= len(ellipsis) |
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258 if width <= 0: # no enough room even for ellipsis |
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259 return ellipsis[:width + len(ellipsis)] |
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260 if leftside: |
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261 return ellipsis + s[-width:] |
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262 return s[:width] + ellipsis |
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263 |
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264 if ucolwidth(u) <= width: # trimming is not needed |
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265 return s |
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266 |
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267 width -= len(ellipsis) |
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268 if width <= 0: # no enough room even for ellipsis |
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269 return ellipsis[:width + len(ellipsis)] |
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270 |
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271 if leftside: |
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272 uslice = lambda i: u[i:] |
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273 concat = lambda s: ellipsis + s |
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274 else: |
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275 uslice = lambda i: u[:-i] |
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276 concat = lambda s: s + ellipsis |
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277 for i in xrange(1, len(u)): |
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278 usub = uslice(i) |
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279 if ucolwidth(usub) <= width: |
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280 return concat(usub.encode(encoding)) |
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281 return ellipsis # no enough room for multi-column characters |
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282 |
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283 def _asciilower(s): |
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284 '''convert a string to lowercase if ASCII |
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285 |
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286 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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287 s.decode('ascii') |
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288 return s.lower() |
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289 |
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290 def asciilower(s): |
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291 # delay importing avoids cyclic dependency around "parsers" in |
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292 # pure Python build (util => i18n => encoding => parsers => util) |
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293 import parsers |
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294 impl = getattr(parsers, 'asciilower', _asciilower) |
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295 global asciilower |
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296 asciilower = impl |
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297 return impl(s) |
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298 |
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299 def _asciiupper(s): |
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300 '''convert a string to uppercase if ASCII |
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301 |
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302 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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303 s.decode('ascii') |
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304 return s.upper() |
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305 |
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306 def asciiupper(s): |
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307 # delay importing avoids cyclic dependency around "parsers" in |
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308 # pure Python build (util => i18n => encoding => parsers => util) |
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309 import parsers |
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310 impl = getattr(parsers, 'asciiupper', _asciiupper) |
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311 global asciiupper |
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312 asciiupper = impl |
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313 return impl(s) |
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314 |
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315 def lower(s): |
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316 "best-effort encoding-aware case-folding of local string s" |
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317 try: |
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318 return asciilower(s) |
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319 except UnicodeDecodeError: |
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320 pass |
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321 try: |
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322 if isinstance(s, localstr): |
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323 u = s._utf8.decode("utf-8") |
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324 else: |
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325 u = s.decode(encoding, encodingmode) |
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326 |
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327 lu = u.lower() |
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328 if u == lu: |
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329 return s # preserve localstring |
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330 return lu.encode(encoding) |
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331 except UnicodeError: |
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332 return s.lower() # we don't know how to fold this except in ASCII |
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333 except LookupError as k: |
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334 raise error.Abort(k, hint="please check your locale settings") |
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335 |
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336 def upper(s): |
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337 "best-effort encoding-aware case-folding of local string s" |
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338 try: |
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339 return asciiupper(s) |
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340 except UnicodeDecodeError: |
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341 return upperfallback(s) |
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342 |
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343 def upperfallback(s): |
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344 try: |
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345 if isinstance(s, localstr): |
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346 u = s._utf8.decode("utf-8") |
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347 else: |
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348 u = s.decode(encoding, encodingmode) |
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349 |
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350 uu = u.upper() |
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351 if u == uu: |
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352 return s # preserve localstring |
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353 return uu.encode(encoding) |
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354 except UnicodeError: |
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355 return s.upper() # we don't know how to fold this except in ASCII |
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356 except LookupError as k: |
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357 raise error.Abort(k, hint="please check your locale settings") |
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358 |
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359 class normcasespecs(object): |
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360 '''what a platform's normcase does to ASCII strings |
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361 |
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362 This is specified per platform, and should be consistent with what normcase |
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363 on that platform actually does. |
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364 |
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365 lower: normcase lowercases ASCII strings |
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366 upper: normcase uppercases ASCII strings |
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367 other: the fallback function should always be called |
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368 |
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369 This should be kept in sync with normcase_spec in util.h.''' |
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370 lower = -1 |
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371 upper = 1 |
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372 other = 0 |
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373 |
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374 _jsonmap = {} |
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375 |
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376 def jsonescape(s): |
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377 '''returns a string suitable for JSON |
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378 |
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379 JSON is problematic for us because it doesn't support non-Unicode |
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380 bytes. To deal with this, we take the following approach: |
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381 |
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382 - localstr objects are converted back to UTF-8 |
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383 - valid UTF-8/ASCII strings are passed as-is |
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384 - other strings are converted to UTF-8b surrogate encoding |
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385 - apply JSON-specified string escaping |
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386 |
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387 (escapes are doubled in these tests) |
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388 |
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389 >>> jsonescape('this is a test') |
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390 'this is a test' |
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391 >>> jsonescape('escape characters: \\0 \\x0b \\t \\n \\r \\" \\\\') |
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392 'escape characters: \\\\u0000 \\\\u000b \\\\t \\\\n \\\\r \\\\" \\\\\\\\' |
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393 >>> jsonescape('a weird byte: \\xdd') |
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394 'a weird byte: \\xed\\xb3\\x9d' |
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395 >>> jsonescape('utf-8: caf\\xc3\\xa9') |
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396 'utf-8: caf\\xc3\\xa9' |
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397 >>> jsonescape('') |
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398 '' |
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399 ''' |
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400 |
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401 if not _jsonmap: |
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402 for x in xrange(32): |
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403 _jsonmap[chr(x)] = "\u%04x" %x |
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404 for x in xrange(32, 256): |
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405 c = chr(x) |
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406 _jsonmap[c] = c |
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407 _jsonmap['\t'] = '\\t' |
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408 _jsonmap['\n'] = '\\n' |
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409 _jsonmap['\"'] = '\\"' |
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410 _jsonmap['\\'] = '\\\\' |
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411 _jsonmap['\b'] = '\\b' |
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412 _jsonmap['\f'] = '\\f' |
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413 _jsonmap['\r'] = '\\r' |
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414 |
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415 return ''.join(_jsonmap[c] for c in toutf8b(s)) |
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416 |
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417 def toutf8b(s): |
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418 '''convert a local, possibly-binary string into UTF-8b |
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419 |
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420 This is intended as a generic method to preserve data when working |
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421 with schemes like JSON and XML that have no provision for |
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422 arbitrary byte strings. As Mercurial often doesn't know |
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423 what encoding data is in, we use so-called UTF-8b. |
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424 |
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425 If a string is already valid UTF-8 (or ASCII), it passes unmodified. |
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426 Otherwise, unsupported bytes are mapped to UTF-16 surrogate range, |
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427 uDC00-uDCFF. |
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428 |
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429 Principles of operation: |
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430 |
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431 - ASCII and UTF-8 data successfully round-trips and is understood |
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432 by Unicode-oriented clients |
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433 - filenames and file contents in arbitrary other encodings can have |
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434 be round-tripped or recovered by clueful clients |
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435 - local strings that have a cached known UTF-8 encoding (aka |
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436 localstr) get sent as UTF-8 so Unicode-oriented clients get the |
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437 Unicode data they want |
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438 - because we must preserve UTF-8 bytestring in places such as |
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439 filenames, metadata can't be roundtripped without help |
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440 |
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441 (Note: "UTF-8b" often refers to decoding a mix of valid UTF-8 and |
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442 arbitrary bytes into an internal Unicode format that can be |
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443 re-encoded back into the original. Here we are exposing the |
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444 internal surrogate encoding as a UTF-8 string.) |
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445 ''' |
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446 |
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447 if isinstance(s, localstr): |
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448 return s._utf8 |
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449 |
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450 try: |
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451 s.decode('utf-8') |
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452 return s |
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453 except UnicodeDecodeError: |
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454 # surrogate-encode any characters that don't round-trip |
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455 s2 = s.decode('utf-8', 'ignore').encode('utf-8') |
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456 r = "" |
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457 pos = 0 |
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458 for c in s: |
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459 if s2[pos:pos + 1] == c: |
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460 r += c |
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461 pos += 1 |
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462 else: |
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463 r += unichr(0xdc00 + ord(c)).encode('utf-8') |
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464 return r |
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465 |
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466 def fromutf8b(s): |
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467 '''Given a UTF-8b string, return a local, possibly-binary string. |
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468 |
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469 return the original binary string. This |
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470 is a round-trip process for strings like filenames, but metadata |
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471 that's was passed through tolocal will remain in UTF-8. |
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472 |
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473 >>> m = "\\xc3\\xa9\\x99abcd" |
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474 >>> n = toutf8b(m) |
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475 >>> n |
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476 '\\xc3\\xa9\\xed\\xb2\\x99abcd' |
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477 >>> fromutf8b(n) == m |
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478 True |
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479 ''' |
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480 |
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481 # fast path - look for uDxxx prefixes in s |
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482 if "\xed" not in s: |
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483 return s |
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484 |
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485 u = s.decode("utf-8") |
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486 r = "" |
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487 for c in u: |
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488 if ord(c) & 0xff00 == 0xdc00: |
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489 r += chr(ord(c) & 0xff) |
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490 else: |
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491 r += c.encode("utf-8") |
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492 return r |