How to recover whitespace from syntax->string

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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