Mercurial > hg
annotate mercurial/encoding.py @ 8716:f3322bb29a0e
dirstate: don't complain about 0-length files
author | Matt Mackall <mpm@selenic.com> |
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date | Thu, 04 Jun 2009 16:21:09 -0500 |
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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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6 # GNU General Public License version 2, incorporated herein by reference. |
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7 |
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8 import error |
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9 import sys, unicodedata, locale, os |
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10 |
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11 _encodingfixup = {'646': 'ascii', 'ANSI_X3.4-1968': 'ascii'} |
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12 |
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13 try: |
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14 encoding = os.environ.get("HGENCODING") |
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15 if sys.platform == 'darwin' and not encoding: |
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16 # On darwin, getpreferredencoding ignores the locale environment and |
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17 # always returns mac-roman. We override this if the environment is |
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18 # not C (has been customized by the user). |
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19 locale.setlocale(locale.LC_CTYPE, '') |
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20 encoding = locale.getlocale()[1] |
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21 if not encoding: |
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22 encoding = locale.getpreferredencoding() or 'ascii' |
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23 encoding = _encodingfixup.get(encoding, encoding) |
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24 except locale.Error: |
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25 encoding = 'ascii' |
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26 encodingmode = os.environ.get("HGENCODINGMODE", "strict") |
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27 fallbackencoding = 'ISO-8859-1' |
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28 |
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29 def tolocal(s): |
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30 """ |
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31 Convert a string from internal UTF-8 to local encoding |
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32 |
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33 All internal strings should be UTF-8 but some repos before the |
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34 implementation of locale support may contain latin1 or possibly |
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35 other character sets. We attempt to decode everything strictly |
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36 using UTF-8, then Latin-1, and failing that, we use UTF-8 and |
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37 replace unknown characters. |
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38 """ |
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39 for e in ('UTF-8', fallbackencoding): |
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40 try: |
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41 u = s.decode(e) # attempt strict decoding |
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42 return u.encode(encoding, "replace") |
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43 except LookupError, k: |
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44 raise error.Abort("%s, please check your locale settings" % k) |
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45 except UnicodeDecodeError: |
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46 pass |
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47 u = s.decode("utf-8", "replace") # last ditch |
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48 return u.encode(encoding, "replace") |
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49 |
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50 def fromlocal(s): |
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51 """ |
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52 Convert a string from the local character encoding to UTF-8 |
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53 |
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54 We attempt to decode strings using the encoding mode set by |
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55 HGENCODINGMODE, which defaults to 'strict'. In this mode, unknown |
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56 characters will cause an error message. Other modes include |
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57 'replace', which replaces unknown characters with a special |
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58 Unicode character, and 'ignore', which drops the character. |
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59 """ |
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60 try: |
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61 return s.decode(encoding, encodingmode).encode("utf-8") |
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62 except UnicodeDecodeError, inst: |
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63 sub = s[max(0, inst.start-10):inst.start+10] |
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64 raise error.Abort("decoding near '%s': %s!" % (sub, inst)) |
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65 except LookupError, k: |
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66 raise error.Abort("%s, please check your locale settings" % k) |
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67 |
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68 def colwidth(s): |
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69 "Find the column width of a UTF-8 string for display" |
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70 d = s.decode(encoding, 'replace') |
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71 if hasattr(unicodedata, 'east_asian_width'): |
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72 w = unicodedata.east_asian_width |
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73 return sum([w(c) in 'WF' and 2 or 1 for c in d]) |
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74 return len(d) |
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75 |