As an experiment I tried ChatGPT4 :melting_face: I...

# forkhandles

[Dmitry Kandalov]

As an experiment I tried ChatGPT4 🫠 It doesn’t know about parser4k or forkhandles (I guess they need more likes on the Internet). But after copy-pasting readme.md into it one section at a time, it was able to give a correct answer 😱 I don’t mean it as “here is how to use Google”, just curious/impressed that it was able to do it. Here is what ChatGPT says:
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The problem you’re facing is that the oneOrMore parser does capture multiple space-separated tokens, but it expects them to be directly adjacent to one another. In other words, it’s expecting input like REMOVE foofoofoo instead of REMOVE foo bar because there’s no parser defined to handle the space between the tokens. To solve this, you can explicitly specify that you’re expecting space-separated tokens. Here’s how you can modify the Remove parser to handle multiple space-separated tokens:

private val Remove: ExprFactory = { parser ->
    inOrder(
        token("REMOVE"),
        oneOrMore(
            inOrder(
                Tokens.space.optional(),
                UpdateAttributeName(parser)
            ).skipFirst()
        )
    ).skipFirst().map { names ->
        Expr { item ->
            val attributeNames = names.map { it.eval(item) }
            item.item.filterKeys { it !in attributeNames }
        }
    }
}

Here’s a breakdown of the changes:
1. Inside the oneOrMore parser, I wrapped the UpdateAttributeName(parser) with another inOrder parser.
2. This new inOrder parser starts with Tokens.space.optional(), which tries to parse a space but doesn’t fail if there isn’t one.
3. I used .skipFirst() to make sure the optional space doesn’t get included in the parsed result.
Now, Remove should be able to parse inputs like REMOVE foo bar.