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Using defmacro badly...

markbeck

Greetings all,

I'm trying to do something which I suspect may not be possible, but I figured I should ask.

I wish to create a macro that allows the user to write the contents of the @rest into a file.

e.g.

MyFileMacro( This is what I want to be written to a file)

I found that if I defined the following macro, I can get close:

(defmacro MyFileMacro (@rest body)
    sprintf(t_body "%L" `,body)
    `FunToWriteOutFile(,t_body)
)

This sorta works, but I have to clean up what is sent to `,body before writing it out to a file. `,body appears to be a bunch of function strings and so I end up with lots of '(' and ')' characters.

The issue I'm encountering is when the user enters in characters that are interpreted as a badly formed macro call...

e.g. MyFileMacro( blah{blah} )

This gives me a syntax error since skill is trying to interpret the contents of body before sending it to `,body.

 Basic question:

Is there a way to force the @rest body contents to be identically returned without any interpretation, such that I can then shove it into a string, or just get it to always interpret it as a string?

 Thanks,
Mark

Parents
  • Mark,

    Fundamentally this is not doable. The arguments to the macro are still parsed by the SKILL parser, just not evaluated. This means it will follow SKILL syntax - so if you were to use SKILL operators it would try to convert into appropriate function calls. So

    sstatus(printinfix nil)
    MyFileMacro(hello + world)

    Would end up with "(plus hello world)"

    (I think - didn't test it).

    If you ended up with part of a SKILL expression, it will just break:

    MyFileMacro(hello +)

    So no, you can't do this. Macros are not intended for this kind of thing.

    Isn't it easier just to put the quotes in yourself?

    Regard,

    Andrew
Reply
  • Mark,

    Fundamentally this is not doable. The arguments to the macro are still parsed by the SKILL parser, just not evaluated. This means it will follow SKILL syntax - so if you were to use SKILL operators it would try to convert into appropriate function calls. So

    sstatus(printinfix nil)
    MyFileMacro(hello + world)

    Would end up with "(plus hello world)"

    (I think - didn't test it).

    If you ended up with part of a SKILL expression, it will just break:

    MyFileMacro(hello +)

    So no, you can't do this. Macros are not intended for this kind of thing.

    Isn't it easier just to put the quotes in yourself?

    Regard,

    Andrew
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