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Re: Difference between # and $
From: |
David Kastrup |
Subject: |
Re: Difference between # and $ |
Date: |
Sun, 30 Mar 2014 00:55:55 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) |
Urs Liska <address@hidden> writes:
> Hi,
>
> I have a hard time to understand the difference between # and $ in
> LilyPond code blocks within Scheme functions.
Same as elsewhere. Please read
<URL:http://lilypond.org/doc/v2.19/Documentation/extending/lilypond-scheme-syntax>
> 2.2.1 of the Extending manual says:
> "Within LilyPond code blocks, use # to reference function arguments
> (eg., ‘#arg1’) or to start an inline Scheme expression containing
> function arguments (eg., ‘#(cons arg1 arg2)’). Where normal Scheme
> expressions using # don’t do the trick, you might need to revert to
> immediate Scheme expressions using $, for example as ‘$music’."
>
> This doesn't really help.
>
> 2.1. says:
> "... can deal with embedded Scheme expressions starting with $ and #."
>
> This is even less helpful.
>
> Please give me a meaningful explanation of what "immediate Scheme
> expressions" are and when and why you should use them.
Those starting with $. You use them if you need either the copying
action (like when a music expression is used more than once), or when
the parser will not accept an expression starting with # because the
syntax rules will only apply to certain types, requiring the type to be
determined by the lexer already.
--
David Kastrup
- Difference between # and $, Urs Liska, 2014/03/29
- Re: Difference between # and $,
David Kastrup <=
- Re: Difference between # and $, Urs Liska, 2014/03/31
- Re: Difference between # and $, David Kastrup, 2014/03/31
- Re: Difference between # and $, Phil Holmes, 2014/03/31
- Re: Difference between # and $, David Kastrup, 2014/03/31
- Re: Difference between # and $, Urs Liska, 2014/03/31
- Re: Difference between # and $, Phil Holmes, 2014/03/31
- Re: Difference between # and $, David Kastrup, 2014/03/31