generic.py 文件源码

def createStringObject(string):
    if isinstance(string, unicode):
        return TextStringObject(string)
    elif isinstance(string, str):
        if string.startswith(codecs.BOM_UTF16_BE):
            retval = TextStringObject(string.decode("utf-16"))
            retval.autodetect_utf16 = True
            return retval
        else:
            # This is probably a big performance hit here, but we need to
            # convert string objects into the text/unicode-aware version if
            # possible... and the only way to check if that's possible is
            # to try.  Some strings are strings, some are just byte arrays.
            try:
                retval = TextStringObject(decode_pdfdocencoding(string))
                retval.autodetect_pdfdocencoding = True
                return retval
            except UnicodeDecodeError:
                return ByteStringObject(string)
    else:
        raise TypeError("createStringObject should have str or unicode arg")