It is simpler than a reader parameter:
#lang racket/base
(define read-colon-keyword
(case-lambda
[(ch port)
(string->keyword (symbol->string (read/recursive port)))]
[(ch port src line col pos)
(datum->syntax #f (read-colon-keyword ch port)
(list src line col pos))]))
(define (make-colon-keyword-readtable)
(make-readtable (current-readtable)
#\:
'non-terminating-macro
read-colon-keyword))
(module+ test
(require rackunit)
(define (reads in out)
(check-equal? (read (open-input-string in)) out))
(parameterize ([current-readtable (make-colon-keyword-readtable)])
(reads "a:b" 'a:b)
(reads ":a" '#:a)
(reads "#:a" '#:a)))
On Wed, Oct 14, 2015 at 7:40 AM, Robby Findler
<[email protected]> wrote:
> It would not be too hard, I believe, to add a parameter to the reader
> so that symbols starting with colons read the same as keywords, and
> then to build a language like s-exp and at-exp that would let you use
> that notation in a fairly seamless and interop-friendly way. Even
> getting syntax coloring shouldn't be too hard.
>
>
> Robby
>
>
> On Wed, Oct 14, 2015 at 12:12 AM, Neil Van Dyke <[email protected]> wrote:
>> I think that Racket 6.3 would be a great time to make `:abc` read the same
>> as `#:abc`.
>>
>> For those of us who are pained deeply by `#:abc`, being able to use `:abc`
>> would be a big aesthetic improvement for Racket.
>>
>> Neil V.
>>
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--
Jay McCarthy
Associate Professor
PLT @ CS @ UMass Lowell
http://jeapostrophe.github.io
"Wherefore, be not weary in well-doing,
for ye are laying the foundation of a great work.
And out of small things proceedeth that which is great."
- D&C 64:33
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