(encoding)
| 69 | return ''.join(chars) |
| 70 | |
| 71 | def search_function(encoding): |
| 72 | |
| 73 | # Cache lookup |
| 74 | entry = _cache.get(encoding, _unknown) |
| 75 | if entry is not _unknown: |
| 76 | return entry |
| 77 | |
| 78 | # Import the module: |
| 79 | # |
| 80 | # First try to find an alias for the normalized encoding |
| 81 | # name and lookup the module using the aliased name, then try to |
| 82 | # lookup the module using the standard import scheme, i.e. first |
| 83 | # try in the encodings package, then at top-level. |
| 84 | # |
| 85 | norm_encoding = normalize_encoding(encoding) |
| 86 | aliased_encoding = _aliases.get(norm_encoding) or \ |
| 87 | _aliases.get(norm_encoding.replace('.', '_')) |
| 88 | if aliased_encoding is not None: |
| 89 | modnames = [aliased_encoding, |
| 90 | norm_encoding] |
| 91 | else: |
| 92 | modnames = [norm_encoding] |
| 93 | for modname in modnames: |
| 94 | if not modname or '.' in modname: |
| 95 | continue |
| 96 | try: |
| 97 | # Import is absolute to prevent the possibly malicious import of a |
| 98 | # module with side-effects that is not in the 'encodings' package. |
| 99 | mod = __import__('encodings.' + modname, fromlist=_import_tail, |
| 100 | level=0) |
| 101 | except ImportError: |
| 102 | # ImportError may occur because 'encodings.(modname)' does not exist, |
| 103 | # or because it imports a name that does not exist (see mbcs and oem) |
| 104 | pass |
| 105 | else: |
| 106 | break |
| 107 | else: |
| 108 | mod = None |
| 109 | |
| 110 | try: |
| 111 | getregentry = mod.getregentry |
| 112 | except AttributeError: |
| 113 | # Not a codec module |
| 114 | mod = None |
| 115 | |
| 116 | if mod is None: |
| 117 | # Cache misses |
| 118 | _cache[encoding] = None |
| 119 | return None |
| 120 | |
| 121 | # Now ask the module for the registry entry |
| 122 | entry = getregentry() |
| 123 | if not isinstance(entry, codecs.CodecInfo): |
| 124 | if not 4 <= len(entry) <= 7: |
| 125 | raise CodecRegistryError('module "%s" (%s) failed to register' |
| 126 | % (mod.__name__, mod.__file__)) |
| 127 | if not callable(entry[0]) or not callable(entry[1]) or \ |
| 128 | (entry[2] is not None and not callable(entry[2])) or \ |
nothing calls this directly
no test coverage detected