Mercurial > hg
annotate mercurial/encoding.py @ 27401:186f2afe9919
patch: disable nobinary when HGPLAIN=1
The diff output without binaries is definitely great for interactive users - a
binary patch is not meaningful for them. Although setting diff.nobinary flag
can break the automation. Let's force full output for automation.
author | Mateusz Kwapich <mitrandir@fb.com> |
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date | Thu, 17 Dec 2015 11:00:06 -0800 |
parents | c2effd1ecebf |
children | c8d3392f76e1 |
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 |
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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 locale |
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11 import os |
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12 import unicodedata |
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13 |
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14 from . import ( |
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15 error, |
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16 ) |
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17 |
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18 # These unicode characters are ignored by HFS+ (Apple Technote 1150, |
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19 # "Unicode Subtleties"), so we need to ignore them in some places for |
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20 # sanity. |
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21 _ignore = [unichr(int(x, 16)).encode("utf-8") for x in |
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22 "200c 200d 200e 200f 202a 202b 202c 202d 202e " |
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23 "206a 206b 206c 206d 206e 206f feff".split()] |
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24 # verify the next function will work |
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25 assert set([i[0] for i in _ignore]) == set(["\xe2", "\xef"]) |
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26 |
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27 def hfsignoreclean(s): |
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28 """Remove codepoints ignored by HFS+ from s. |
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29 |
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30 >>> hfsignoreclean(u'.h\u200cg'.encode('utf-8')) |
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31 '.hg' |
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32 >>> hfsignoreclean(u'.h\ufeffg'.encode('utf-8')) |
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33 '.hg' |
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34 """ |
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35 if "\xe2" in s or "\xef" in s: |
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36 for c in _ignore: |
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37 s = s.replace(c, '') |
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38 return s |
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39 |
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40 def _getpreferredencoding(): |
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41 ''' |
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42 On darwin, getpreferredencoding ignores the locale environment and |
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43 always returns mac-roman. http://bugs.python.org/issue6202 fixes this |
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44 for Python 2.7 and up. This is the same corrected code for earlier |
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45 Python versions. |
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46 |
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47 However, we can't use a version check for this method, as some distributions |
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48 patch Python to fix this. Instead, we use it as a 'fixer' for the mac-roman |
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49 encoding, as it is unlikely that this encoding is the actually expected. |
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50 ''' |
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51 try: |
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52 locale.CODESET |
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53 except AttributeError: |
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54 # Fall back to parsing environment variables :-( |
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55 return locale.getdefaultlocale()[1] |
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56 |
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57 oldloc = locale.setlocale(locale.LC_CTYPE) |
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58 locale.setlocale(locale.LC_CTYPE, "") |
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59 result = locale.nl_langinfo(locale.CODESET) |
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60 locale.setlocale(locale.LC_CTYPE, oldloc) |
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61 |
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62 return result |
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63 |
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64 _encodingfixers = { |
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65 '646': lambda: 'ascii', |
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66 'ANSI_X3.4-1968': lambda: 'ascii', |
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67 'mac-roman': _getpreferredencoding |
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68 } |
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69 |
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70 try: |
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71 encoding = os.environ.get("HGENCODING") |
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72 if not encoding: |
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73 encoding = locale.getpreferredencoding() or 'ascii' |
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74 encoding = _encodingfixers.get(encoding, lambda: encoding)() |
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75 except locale.Error: |
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76 encoding = 'ascii' |
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77 encodingmode = os.environ.get("HGENCODINGMODE", "strict") |
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78 fallbackencoding = 'ISO-8859-1' |
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79 |
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80 class localstr(str): |
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81 '''This class allows strings that are unmodified to be |
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82 round-tripped to the local encoding and back''' |
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83 def __new__(cls, u, l): |
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84 s = str.__new__(cls, l) |
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85 s._utf8 = u |
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86 return s |
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87 def __hash__(self): |
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88 return hash(self._utf8) # avoid collisions in local string space |
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89 |
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90 def tolocal(s): |
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91 """ |
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92 Convert a string from internal UTF-8 to local encoding |
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93 |
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94 All internal strings should be UTF-8 but some repos before the |
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95 implementation of locale support may contain latin1 or possibly |
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96 other character sets. We attempt to decode everything strictly |
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97 using UTF-8, then Latin-1, and failing that, we use UTF-8 and |
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98 replace unknown characters. |
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99 |
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100 The localstr class is used to cache the known UTF-8 encoding of |
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101 strings next to their local representation to allow lossless |
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102 round-trip conversion back to UTF-8. |
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103 |
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104 >>> u = 'foo: \\xc3\\xa4' # utf-8 |
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105 >>> l = tolocal(u) |
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106 >>> l |
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107 'foo: ?' |
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108 >>> fromlocal(l) |
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109 'foo: \\xc3\\xa4' |
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110 >>> u2 = 'foo: \\xc3\\xa1' |
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111 >>> d = { l: 1, tolocal(u2): 2 } |
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112 >>> len(d) # no collision |
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113 2 |
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114 >>> 'foo: ?' in d |
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115 False |
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116 >>> l1 = 'foo: \\xe4' # historical latin1 fallback |
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117 >>> l = tolocal(l1) |
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118 >>> l |
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119 'foo: ?' |
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120 >>> fromlocal(l) # magically in utf-8 |
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121 'foo: \\xc3\\xa4' |
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122 """ |
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123 |
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124 try: |
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125 try: |
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126 # make sure string is actually stored in UTF-8 |
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127 u = s.decode('UTF-8') |
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128 if encoding == 'UTF-8': |
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129 # fast path |
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130 return s |
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131 r = u.encode(encoding, "replace") |
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132 if u == r.decode(encoding): |
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133 # r is a safe, non-lossy encoding of s |
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134 return r |
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135 return localstr(s, r) |
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136 except UnicodeDecodeError: |
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137 # we should only get here if we're looking at an ancient changeset |
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138 try: |
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139 u = s.decode(fallbackencoding) |
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140 r = u.encode(encoding, "replace") |
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141 if u == r.decode(encoding): |
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142 # r is a safe, non-lossy encoding of s |
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143 return r |
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144 return localstr(u.encode('UTF-8'), r) |
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145 except UnicodeDecodeError: |
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146 u = s.decode("utf-8", "replace") # last ditch |
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147 return u.encode(encoding, "replace") # can't round-trip |
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148 except LookupError as k: |
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149 raise error.Abort(k, hint="please check your locale settings") |
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150 |
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151 def fromlocal(s): |
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152 """ |
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153 Convert a string from the local character encoding to UTF-8 |
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154 |
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155 We attempt to decode strings using the encoding mode set by |
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156 HGENCODINGMODE, which defaults to 'strict'. In this mode, unknown |
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157 characters will cause an error message. Other modes include |
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158 'replace', which replaces unknown characters with a special |
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159 Unicode character, and 'ignore', which drops the character. |
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160 """ |
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161 |
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162 # can we do a lossless round-trip? |
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163 if isinstance(s, localstr): |
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164 return s._utf8 |
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165 |
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166 try: |
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167 return s.decode(encoding, encodingmode).encode("utf-8") |
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168 except UnicodeDecodeError as inst: |
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169 sub = s[max(0, inst.start - 10):inst.start + 10] |
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170 raise error.Abort("decoding near '%s': %s!" % (sub, inst)) |
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171 except LookupError as k: |
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172 raise error.Abort(k, hint="please check your locale settings") |
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173 |
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174 # How to treat ambiguous-width characters. Set to 'wide' to treat as wide. |
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175 wide = (os.environ.get("HGENCODINGAMBIGUOUS", "narrow") == "wide" |
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176 and "WFA" or "WF") |
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177 |
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178 def colwidth(s): |
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179 "Find the column width of a string for display in the local encoding" |
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180 return ucolwidth(s.decode(encoding, 'replace')) |
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181 |
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182 def ucolwidth(d): |
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183 "Find the column width of a Unicode string for display" |
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184 eaw = getattr(unicodedata, 'east_asian_width', None) |
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185 if eaw is not None: |
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186 return sum([eaw(c) in wide and 2 or 1 for c in d]) |
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187 return len(d) |
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188 |
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189 def getcols(s, start, c): |
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190 '''Use colwidth to find a c-column substring of s starting at byte |
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191 index start''' |
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192 for x in xrange(start + c, len(s)): |
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193 t = s[start:x] |
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194 if colwidth(t) == c: |
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195 return t |
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196 |
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197 def trim(s, width, ellipsis='', leftside=False): |
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198 """Trim string 's' to at most 'width' columns (including 'ellipsis'). |
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199 |
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200 If 'leftside' is True, left side of string 's' is trimmed. |
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201 'ellipsis' is always placed at trimmed side. |
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202 |
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203 >>> ellipsis = '+++' |
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204 >>> from . import encoding |
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205 >>> encoding.encoding = 'utf-8' |
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206 >>> t= '1234567890' |
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207 >>> print trim(t, 12, ellipsis=ellipsis) |
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208 1234567890 |
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209 >>> print trim(t, 10, ellipsis=ellipsis) |
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210 1234567890 |
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211 >>> print trim(t, 8, ellipsis=ellipsis) |
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212 12345+++ |
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213 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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214 +++67890 |
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215 >>> print trim(t, 8) |
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216 12345678 |
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217 >>> print trim(t, 8, leftside=True) |
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218 34567890 |
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219 >>> print trim(t, 3, ellipsis=ellipsis) |
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220 +++ |
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221 >>> print trim(t, 1, ellipsis=ellipsis) |
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222 + |
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223 >>> u = u'\u3042\u3044\u3046\u3048\u304a' # 2 x 5 = 10 columns |
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224 >>> t = u.encode(encoding.encoding) |
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225 >>> print trim(t, 12, ellipsis=ellipsis) |
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226 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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227 >>> print trim(t, 10, ellipsis=ellipsis) |
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228 \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a |
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229 >>> print trim(t, 8, ellipsis=ellipsis) |
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230 \xe3\x81\x82\xe3\x81\x84+++ |
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231 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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232 +++\xe3\x81\x88\xe3\x81\x8a |
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233 >>> print trim(t, 5) |
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234 \xe3\x81\x82\xe3\x81\x84 |
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235 >>> print trim(t, 5, leftside=True) |
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236 \xe3\x81\x88\xe3\x81\x8a |
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237 >>> print trim(t, 4, ellipsis=ellipsis) |
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238 +++ |
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239 >>> print trim(t, 4, ellipsis=ellipsis, leftside=True) |
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240 +++ |
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241 >>> t = '\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa' # invalid byte sequence |
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242 >>> print trim(t, 12, ellipsis=ellipsis) |
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243 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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244 >>> print trim(t, 10, ellipsis=ellipsis) |
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245 \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa |
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246 >>> print trim(t, 8, ellipsis=ellipsis) |
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247 \x11\x22\x33\x44\x55+++ |
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248 >>> print trim(t, 8, ellipsis=ellipsis, leftside=True) |
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249 +++\x66\x77\x88\x99\xaa |
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250 >>> print trim(t, 8) |
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251 \x11\x22\x33\x44\x55\x66\x77\x88 |
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252 >>> print trim(t, 8, leftside=True) |
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253 \x33\x44\x55\x66\x77\x88\x99\xaa |
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254 >>> print trim(t, 3, ellipsis=ellipsis) |
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255 +++ |
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256 >>> print trim(t, 1, ellipsis=ellipsis) |
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257 + |
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258 """ |
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259 try: |
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260 u = s.decode(encoding) |
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261 except UnicodeDecodeError: |
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262 if len(s) <= width: # trimming is not needed |
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263 return s |
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264 width -= len(ellipsis) |
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265 if width <= 0: # no enough room even for ellipsis |
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266 return ellipsis[:width + len(ellipsis)] |
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267 if leftside: |
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268 return ellipsis + s[-width:] |
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269 return s[:width] + ellipsis |
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270 |
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271 if ucolwidth(u) <= width: # trimming is not needed |
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272 return s |
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273 |
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274 width -= len(ellipsis) |
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275 if width <= 0: # no enough room even for ellipsis |
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276 return ellipsis[:width + len(ellipsis)] |
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277 |
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278 if leftside: |
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279 uslice = lambda i: u[i:] |
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280 concat = lambda s: ellipsis + s |
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281 else: |
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282 uslice = lambda i: u[:-i] |
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283 concat = lambda s: s + ellipsis |
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284 for i in xrange(1, len(u)): |
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285 usub = uslice(i) |
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286 if ucolwidth(usub) <= width: |
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287 return concat(usub.encode(encoding)) |
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288 return ellipsis # no enough room for multi-column characters |
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289 |
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290 def _asciilower(s): |
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291 '''convert a string to lowercase if ASCII |
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292 |
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293 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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294 s.decode('ascii') |
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295 return s.lower() |
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296 |
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297 def asciilower(s): |
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298 # delay importing avoids cyclic dependency around "parsers" in |
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299 # pure Python build (util => i18n => encoding => parsers => util) |
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300 from . import parsers |
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301 impl = getattr(parsers, 'asciilower', _asciilower) |
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302 global asciilower |
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303 asciilower = impl |
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304 return impl(s) |
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305 |
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306 def _asciiupper(s): |
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307 '''convert a string to uppercase if ASCII |
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308 |
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309 Raises UnicodeDecodeError if non-ASCII characters are found.''' |
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310 s.decode('ascii') |
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311 return s.upper() |
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312 |
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313 def asciiupper(s): |
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314 # delay importing avoids cyclic dependency around "parsers" in |
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315 # pure Python build (util => i18n => encoding => parsers => util) |
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316 from . import parsers |
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317 impl = getattr(parsers, 'asciiupper', _asciiupper) |
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318 global asciiupper |
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319 asciiupper = impl |
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320 return impl(s) |
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321 |
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322 def lower(s): |
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323 "best-effort encoding-aware case-folding of local string s" |
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324 try: |
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325 return asciilower(s) |
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3745ae495ce5
encoding: use s.decode to trigger UnicodeDecodeError
Martin Geisler <mg@aragost.com>
parents:
16493
diff
changeset
|
326 except UnicodeDecodeError: |
16387
c481761033bd
encoding: add fast-path for ASCII lowercase
Matt Mackall <mpm@selenic.com>
parents:
16274
diff
changeset
|
327 pass |
c481761033bd
encoding: add fast-path for ASCII lowercase
Matt Mackall <mpm@selenic.com>
parents:
16274
diff
changeset
|
328 try: |
14069
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
13940
diff
changeset
|
329 if isinstance(s, localstr): |
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
13940
diff
changeset
|
330 u = s._utf8.decode("utf-8") |
e38846a79a23
encoding: add an encoding-aware lower function
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parents:
13940
diff
changeset
|
331 else: |
e38846a79a23
encoding: add an encoding-aware lower function
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parents:
13940
diff
changeset
|
332 u = s.decode(encoding, encodingmode) |
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
13940
diff
changeset
|
333 |
e38846a79a23
encoding: add an encoding-aware lower function
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parents:
13940
diff
changeset
|
334 lu = u.lower() |
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
13940
diff
changeset
|
335 if u == lu: |
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
13940
diff
changeset
|
336 return s # preserve localstring |
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
13940
diff
changeset
|
337 return lu.encode(encoding) |
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
13940
diff
changeset
|
338 except UnicodeError: |
e38846a79a23
encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
339 return s.lower() # we don't know how to fold this except in ASCII |
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328739ea70c3
global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
340 except LookupError as k: |
15672
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
15143
diff
changeset
|
341 raise error.Abort(k, hint="please check your locale settings") |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
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parents:
15143
diff
changeset
|
342 |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
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parents:
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diff
changeset
|
343 def upper(s): |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
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parents:
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diff
changeset
|
344 "best-effort encoding-aware case-folding of local string s" |
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i18n: use encoding.lower/upper for encoding aware case folding
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parents:
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diff
changeset
|
345 try: |
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ac08de78de7f
encoding: use parsers.asciiupper when available
Siddharth Agarwal <sid0@fb.com>
parents:
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diff
changeset
|
346 return asciiupper(s) |
17236
9fb8312dbdbd
encoding: add fast-path for ASCII uppercase.
Martin Geisler <mg@aragost.com>
parents:
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diff
changeset
|
347 except UnicodeDecodeError: |
24597
b4258d5a1600
encoding.upper: factor out fallback code
Siddharth Agarwal <sid0@fb.com>
parents:
24593
diff
changeset
|
348 return upperfallback(s) |
b4258d5a1600
encoding.upper: factor out fallback code
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parents:
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diff
changeset
|
349 |
b4258d5a1600
encoding.upper: factor out fallback code
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parents:
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diff
changeset
|
350 def upperfallback(s): |
17236
9fb8312dbdbd
encoding: add fast-path for ASCII uppercase.
Martin Geisler <mg@aragost.com>
parents:
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diff
changeset
|
351 try: |
15672
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
15143
diff
changeset
|
352 if isinstance(s, localstr): |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
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parents:
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diff
changeset
|
353 u = s._utf8.decode("utf-8") |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
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parents:
15143
diff
changeset
|
354 else: |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
15143
diff
changeset
|
355 u = s.decode(encoding, encodingmode) |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
15143
diff
changeset
|
356 |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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diff
changeset
|
357 uu = u.upper() |
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i18n: use encoding.lower/upper for encoding aware case folding
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parents:
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diff
changeset
|
358 if u == uu: |
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i18n: use encoding.lower/upper for encoding aware case folding
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parents:
15143
diff
changeset
|
359 return s # preserve localstring |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
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parents:
15143
diff
changeset
|
360 return uu.encode(encoding) |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
15143
diff
changeset
|
361 except UnicodeError: |
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
15143
diff
changeset
|
362 return s.upper() # we don't know how to fold this except in ASCII |
25660
328739ea70c3
global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24608
diff
changeset
|
363 except LookupError as k: |
15672
2ebe3d0ce91d
i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
15143
diff
changeset
|
364 raise error.Abort(k, hint="please check your locale settings") |
16133
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
365 |
24593
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
366 class normcasespecs(object): |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
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diff
changeset
|
367 '''what a platform's normcase does to ASCII strings |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
368 |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
369 This is specified per platform, and should be consistent with what normcase |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
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parents:
24578
diff
changeset
|
370 on that platform actually does. |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
371 |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
372 lower: normcase lowercases ASCII strings |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
373 upper: normcase uppercases ASCII strings |
24608
1c533e23ce95
util.h: define an enum for normcase specs
Siddharth Agarwal <sid0@fb.com>
parents:
24597
diff
changeset
|
374 other: the fallback function should always be called |
1c533e23ce95
util.h: define an enum for normcase specs
Siddharth Agarwal <sid0@fb.com>
parents:
24597
diff
changeset
|
375 |
1c533e23ce95
util.h: define an enum for normcase specs
Siddharth Agarwal <sid0@fb.com>
parents:
24597
diff
changeset
|
376 This should be kept in sync with normcase_spec in util.h.''' |
24593
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
377 lower = -1 |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
378 upper = 1 |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
379 other = 0 |
f473a1fe5c7c
encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents:
24578
diff
changeset
|
380 |
22426
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
381 _jsonmap = {} |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
382 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
383 def jsonescape(s): |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
384 '''returns a string suitable for JSON |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
385 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
386 JSON is problematic for us because it doesn't support non-Unicode |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
387 bytes. To deal with this, we take the following approach: |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
388 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
389 - localstr objects are converted back to UTF-8 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
390 - valid UTF-8/ASCII strings are passed as-is |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
391 - other strings are converted to UTF-8b surrogate encoding |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
392 - apply JSON-specified string escaping |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
393 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
394 (escapes are doubled in these tests) |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
395 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
396 >>> jsonescape('this is a test') |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
397 'this is a test' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
398 >>> jsonescape('escape characters: \\0 \\x0b \\t \\n \\r \\" \\\\') |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
399 'escape characters: \\\\u0000 \\\\u000b \\\\t \\\\n \\\\r \\\\" \\\\\\\\' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
400 >>> jsonescape('a weird byte: \\xdd') |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
401 'a weird byte: \\xed\\xb3\\x9d' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
402 >>> jsonescape('utf-8: caf\\xc3\\xa9') |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
403 'utf-8: caf\\xc3\\xa9' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
404 >>> jsonescape('') |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
405 '' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
406 ''' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
407 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
408 if not _jsonmap: |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
409 for x in xrange(32): |
27356
c2effd1ecebf
encoding: use double backslash
Gregory Szorc <gregory.szorc@gmail.com>
parents:
27355
diff
changeset
|
410 _jsonmap[chr(x)] = "\\u%04x" % x |
22426
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
411 for x in xrange(32, 256): |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
412 c = chr(x) |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
413 _jsonmap[c] = c |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
414 _jsonmap['\t'] = '\\t' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
415 _jsonmap['\n'] = '\\n' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
416 _jsonmap['\"'] = '\\"' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
417 _jsonmap['\\'] = '\\\\' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
418 _jsonmap['\b'] = '\\b' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
419 _jsonmap['\f'] = '\\f' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
420 _jsonmap['\r'] = '\\r' |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
421 |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
422 return ''.join(_jsonmap[c] for c in toutf8b(s)) |
f6b533e64ed6
encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents:
22425
diff
changeset
|
423 |
26875
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
424 _utf8len = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 4] |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
425 |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
426 def getutf8char(s, pos): |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
427 '''get the next full utf-8 character in the given string, starting at pos |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
428 |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
429 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
|
430 utf-8 character. |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
431 ''' |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
432 |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
433 # find how many bytes to attempt decoding from first nibble |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
434 l = _utf8len[ord(s[pos]) >> 4] |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
435 if not l: # ascii |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
436 return s[pos] |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
437 |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
438 c = s[pos:pos + l] |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
439 # validate with attempted decode |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
440 c.decode("utf-8") |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
441 return c |
cf47bdb2183c
encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents:
25660
diff
changeset
|
442 |
16133
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
443 def toutf8b(s): |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
444 '''convert a local, possibly-binary string into UTF-8b |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
changeset
|
445 |
84c58da3a1f8
encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents:
15769
diff
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446 This is intended as a generic method to preserve data when working |
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447 with schemes like JSON and XML that have no provision for |
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448 arbitrary byte strings. As Mercurial often doesn't know |
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449 what encoding data is in, we use so-called UTF-8b. |
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450 |
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451 If a string is already valid UTF-8 (or ASCII), it passes unmodified. |
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452 Otherwise, unsupported bytes are mapped to UTF-16 surrogate range, |
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453 uDC00-uDCFF. |
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454 |
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455 Principles of operation: |
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456 |
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457 - ASCII and UTF-8 data successfully round-trips and is understood |
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458 by Unicode-oriented clients |
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459 - filenames and file contents in arbitrary other encodings can have |
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460 be round-tripped or recovered by clueful clients |
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461 - local strings that have a cached known UTF-8 encoding (aka |
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462 localstr) get sent as UTF-8 so Unicode-oriented clients get the |
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463 Unicode data they want |
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464 - because we must preserve UTF-8 bytestring in places such as |
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465 filenames, metadata can't be roundtripped without help |
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466 |
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467 (Note: "UTF-8b" often refers to decoding a mix of valid UTF-8 and |
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468 arbitrary bytes into an internal Unicode format that can be |
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469 re-encoded back into the original. Here we are exposing the |
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470 internal surrogate encoding as a UTF-8 string.) |
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471 ''' |
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472 |
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473 if "\xed" not in s: |
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474 if isinstance(s, localstr): |
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475 return s._utf8 |
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476 try: |
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477 s.decode('utf-8') |
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478 return s |
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479 except UnicodeDecodeError: |
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480 pass |
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481 |
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482 r = "" |
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483 pos = 0 |
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484 l = len(s) |
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485 while pos < l: |
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486 try: |
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487 c = getutf8char(s, pos) |
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488 if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf": |
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489 # have to re-escape existing U+DCxx characters |
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490 c = unichr(0xdc00 + ord(s[pos])).encode('utf-8') |
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491 pos += 1 |
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492 else: |
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493 pos += len(c) |
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494 except UnicodeDecodeError: |
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495 c = unichr(0xdc00 + ord(s[pos])).encode('utf-8') |
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496 pos += 1 |
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497 r += c |
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498 return r |
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499 |
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500 def fromutf8b(s): |
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501 '''Given a UTF-8b string, return a local, possibly-binary string. |
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502 |
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503 return the original binary string. This |
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504 is a round-trip process for strings like filenames, but metadata |
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505 that's was passed through tolocal will remain in UTF-8. |
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506 |
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507 >>> roundtrip = lambda x: fromutf8b(toutf8b(x)) == x |
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508 >>> m = "\\xc3\\xa9\\x99abcd" |
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509 >>> toutf8b(m) |
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510 '\\xc3\\xa9\\xed\\xb2\\x99abcd' |
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511 >>> roundtrip(m) |
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512 True |
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513 >>> roundtrip("\\xc2\\xc2\\x80") |
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514 True |
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515 >>> roundtrip("\\xef\\xbf\\xbd") |
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516 True |
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517 >>> roundtrip("\\xef\\xef\\xbf\\xbd") |
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518 True |
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519 ''' |
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520 |
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521 # fast path - look for uDxxx prefixes in s |
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522 if "\xed" not in s: |
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523 return s |
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524 |
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525 u = s.decode("utf-8") |
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526 r = "" |
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527 for c in u: |
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528 if ord(c) & 0xffff00 == 0xdc00: |
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529 r += chr(ord(c) & 0xff) |
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530 else: |
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531 r += c.encode("utf-8") |
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532 return r |