Swi prolog file io

Improve this question. Igor Marvinsky Igor Marvinsky 1 1 gold badge 4 4 silver badges 16 16 bronze badges. Add a comment. Active Oldest Votes.

Example: readFile. Thus by invoking main you will recieve the output:? I assume that this principle can be applied to answer your question. Good luck. Improve this answer. Ishq Ishq 1, 1 1 gold badge 7 7 silver badges 9 9 bronze badges.

Know what this means? Sample usage:? I know it's been a long time, but I'm trying this method and it seems to take an absurdly long time. Could you provide an example of some performant code using DCGs and library pio that will read in a file by lines?

Thanks so much! I see my error before was using the example in the SWI-Prolog library pio documentation for my model. Out of curiosity, why must we use call eos instead of a dcg rule? You cannot use a DCG rule instead, because DCG rules are subject to translation rules that let them only refer to certain parts of these arguments.

Thanks again! I reworked the problem I was attempting with the help of your example, and it ended up in a fairly elegant solution. Do you still require Python 2 support? PySwip has no Windows installers! There are some "free download" sites that claim to be hosting PySwip installers. Thanks to all contributors. It features an incomplete SWI-Prolog foreign language interface, a utility class that makes it easy querying with Prolog and also a Pythonic interface. Since PySwip uses SWI-Prolog as a shared library and ctypes to access it, it doesn't require compilation to be installed.

An existing knowledge base stored in a Prolog file can also be consulted, and queried. Stream Open a stream that produces no output. All counting functions are enabled on such a stream. An attempt to read from a null-stream will immediately signal end-of-file. Stream can be an atom, giving the null-stream an alias name. If Stream is not open an error message is displayed. If the closed stream is the current input or output stream the terminal is made the current input or output.

Called this way, any resource error such as write-errors while flushing the output buffer are ignored. Values are: read , write , append and the SWI-Prolog extension update. Otherwise unify Atom with the first alias of the stream. It is assumed the position can be set if the stream has a seek-function and is not based on a POSIX file-descriptor that is not associated to a regular file. SWI-Prolog extension used primarily for integration with foreign code. Buffering is one of full , line or false.

Object is the name of the file opened if the stream refers to an open file, an integer file-descriptor if the stream encapsulates an operating-system stream or the atom if the stream refers to some other object.