Check out the Chibi library (chibi show c). in the Chibi repo at lib/chibi/show/c.scm and .sld. It provides combinators that create a C equivalent of the sexp; there is both a macro-based compiler and an interpreter, IIRC. Unfortunately there is no real documentation. There's some cleverness in it: c-if in statement context expands to an if-statement, but in an expression context to a ?: operator. If you import (chibi show) and (chibi show c) then (show #t (c-if 'foo 'bar 'baz)) will generate a statement, but (show #t (c+ 2 (c-if 'foo 'bar 'baz))) will generate an expression.
On Thu, May 28, 2020 at 11:38 PM Keith Wright <kwri...@keithdiane.us> wrote: > I am thinkging about a project that uses Scheme macros > to generate C code. To this end I want to encode C > programs as S-expressions. For example, the C program > that is encoded in Ascii as > > for (j=0;j<12;++j) a[j] = j*pi/6; > > might be encoded as an S-expression as > > (for ((= j 0)(< j 12) (++ j)) (= (sub a j)(/ (* j pi) 6))) > > Note that this is not a valid Scheme program, even with > non-standard functions defined. It is a re-encoding > of the Ascii C syntax as an S-expression. > > I think I have read about something like this, perhaps > on this list, I am not sure. (Note to future language > inventors: a single letter name makes a horrible Google > search query. Name things with made up but pronouncable > words---perl, fortran...) > > I most need to convert S-expr encoded C, to Ascii encoded C, > but I am interested in > (a) programs to convert S-expresions to C > (b) specifications for the form of the S-expr encoding > (c) better plans; advice from those who have tried and failed. > > Any pointers? > > -- Keith > > >
