2016-10-08 20:00 GMT+02:00 Ryan Culpepper <ry...@ccs.neu.edu>:
> Does one of the `string-normalize-*` functions do what you want?
>
No. I am basically implementing the part of the reader that lexes string
literals.
I want to allow full Racket syntax in the string literals in my infix
package.
One solution is to use (read (open-input-string lexeme)) but I am afraid
that will
be slow.
The job is therefore to turn "\\ud800\\udc00" into "\ud800\udc00" (the
latter a legal string literal).
Since
(string (integer->char (string->number "d800" 16))
(integer->char (string->number "dc00" 16)))
produces the error
integer->char: contract violation
expected: (and/c (integer-in 0 #x10FFFF) (not/c (integer-in #xD800
#xDFFF)))
given: 55296
it is necessary to produce the character directly.
/Jens Axel
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