Re: Commented by default
> On 27. Apr 2024, at 20:02, felix.winkelm...@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
Re: Commented by default
> 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
Commented by default
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. Thanks for your help and insights Christian