Re: Commented by default

[Christian Himpe]

> On 27. Apr 2024, at 20:02, felix.winkelmann@bevuta.com wrote:
> 
>> Dear All,
>> 
>> is it somehow possible (ie via macros) to have a line in a scheme source 
>> code file being a comment line by default and only when a certain symbol or 
>> group of symbols is starting a line it is an uncommented / evaluated line? 
>> Basically, the reverse of a normal source file where I need to introduce a 
>> comment line. I would imagine a header line setting up this "comment"-mode, 
>> and below this every line becomes a comment unless explicitly uncommented.
> 
> You could use "set-read-syntax!" or "set-sharp-read-syntax!" to define a 
> sequence
> that either treats the line as a comment or reads and returns it as an 
> expression.
> Dropping means to skip subsequent lines prefixed with the chosen sequence or
> returning the first expression that follows. Since an expression may straddle 
> multiple
> prefixed lines, you may have to dynamically bind a flag that ignores the 
> sequence
> in nested reads. This may need a bit of fiddling, but that is probably the 
> approach
> I would try.
> 
> 
> felix
> 

Dear felix,

This looks like a very good starting point. Thank you for pointing me in the 
right direction.

Cheers

Christian