Taking file from downloads and inputing into prolog

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Computer Network. Add a comment. Active Oldest Votes. Advantages of DCGs There are a few major advantage of using DCGs for this task: You can easily test your parser interactively , without having to modify a separate file. A sufficiently general DCG can be used to parse as well as generate test data. Knowing this method may come in handy for more complex parsing tasks , which do not fit a predetermined format like CSV.

I recommend this setting because it makes working with DCGs more readable. Sample queries Here are a few examples:? The last example makes clear that whitespace cannot be part of a token. And that's it! We can use these DCGs together to: tokenize a file or given list of characters parse the tokens to create structured data. Sample query:? Improve this answer. Right now you can ask, "where do I have gold":?

Or, "where do I have a pit"? Supposing your input were in wumpus. So from this example, we can see that using the see predicate we can read from the file. Now after using seen command, the control transfers to the console again. So finally it takes input from console. We have seen how to read specific contents few lines of a file. Using read and write we can read or write the value of atoms, predicates, strings, etc.

Now in this section we will see how to write single characters into the current output stream, or how to read from current input stream. So there are some predefined predicates to do these tasks. We can use put C to write one character at a time into the current output stream.

The output stream can be a file or the console. This will take the character. The atom constructing means from a list of characters, we can make one atom, or from a list of ASCII values also we can make atoms. In both cases, the first argument will be one variable, and the second argument will be a list. The atom decomposing means from an atom, we can get a sequence of characters, or a sequence ASCII codes.