xmldocs.py 文件源码

def _detect_encoding(self, fileid):
        if isinstance(fileid, PathPointer):
            s = fileid.open().readline()
        else:
            with open(fileid, 'rb') as infile:
                s = infile.readline()
        if s.startswith(codecs.BOM_UTF16_BE):
            return 'utf-16-be'
        if s.startswith(codecs.BOM_UTF16_LE):
            return 'utf-16-le'
        if s.startswith(codecs.BOM_UTF32_BE):
            return 'utf-32-be'
        if s.startswith(codecs.BOM_UTF32_LE):
            return 'utf-32-le'
        if s.startswith(codecs.BOM_UTF8):
            return 'utf-8'
        m = re.match(br'\s*<\?xml\b.*\bencoding="([^"]+)"', s)
        if m:
            return m.group(1).decode()
        m = re.match(br"\s*<\?xml\b.*\bencoding='([^']+)'", s)
        if m:
            return m.group(1).decode()
        # No encoding found -- what should the default be?
        return 'utf-8'