You need to enable line/character counting with `port-count-lines!`: #lang racket (require syntax/to-string)
(define in (open-input-string "(comment\n \"hello world\"\n line)")) (port-count-lines! in) (syntax->string (read-syntax "mystring" in)) ; -> "comment\n \"hello world\"\n line" On Fri, Apr 9, 2021 at 2:10 AM Jeff Henrikson <jehenri...@gmail.com> wrote: > Racket users, > > I’m trying to read a scheme file, decorate a bit of window dressing around > the edges, and write the expressions to a new file. I’ve got the basic > mechanism working with (read . . .) and (pretty-write . . .), but of course > that doesn’t preserve linebreaks. So now I’m trying to improve it to > preserve linebreaks. It would be nice to preserve all whitespace, but I'll > settle for linebreaks. The racket docs seem to suggest it is possible: > > 2.6 Rendering Syntax Objects with Formatting > (require syntax/to-string) package: base > procedure > (syntax->string stx-list) → string? > stx-list : (and/c syntax? stx-list?) > Builds a string with newlines and indenting according to the source > locations in stx-list; the outer pair of parens are not rendered from > stx-list. > > However, when I evaluate: > > (syntax->string (read-syntax "mystring" (open-input-string "(comment\n > \"hello world\"\n line)"))) > > I get: > > "comment\"hello world\"line" > > which has no whitespace at all, not even the whitespace that is necessary > to separate the original tokens. > > I get a similar behavior if I read-syntax from a file and apply > syntax->string to those values. > > Does anyone know how to get syntax->string to recover the original > whitespace? > > I'm using Racket 8.0 cs on Ubuntu 20. > > > Thanks in advance, > > > Jeff Henrikson > > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/95dd99f5-2d04-a607-ed11-bc235095eeb7%40gmail.com > <https://groups.google.com/d/msgid/racket-users/95dd99f5-2d04-a607-ed11-bc235095eeb7%40gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CABNTSaHGKHh%2B7JHEf3Zrdba4t-N65CVJ1ZTud0w3kBiUUoBsuw%40mail.gmail.com.
