typestring.py 文件源码

def __init__(self, s):
        self.str = s

        # Extract arguments (anything that follows ':')
        if ':' in s:
            self.ts_format, _, arguments_str = s.partition(':')
            self.arguments = tuple(arguments_str.split(','))
        else:
            self.ts_format = s
            self.arguments = tuple()

        # Check if is mimetype, extension or qualifier
        self.is_qualifier = False
        self.mimetype = None
        self.extension = None
        if '/' in self.ts_format:
            self.mimetype = self.ts_format
            ext = mimetypes.guess_extension(self.mimetype)
            if ext:
                self.extension = ext.strip('.').upper()
        elif self.ts_format.isupper():
            self.extension = self.ts_format
            fn = 'fn.%s' % self.extension
            self.mimetype, _ = mimetypes.guess_type(fn)  # discard encoding
        else:
            # Is qualifier, can't determine mimetype OR extension
            self.is_qualifier = True