Laurent,
Thank you very much. It probably would have taken me a long time on my
own to think of the possibility that the port was at fault.
Jeff
On 4/9/21 4:29 AM, Laurent wrote:
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
<mailto: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
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