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beautiful-racket/beautiful-racket-lib/br/private/generate-literals.rkt

21 lines
945 B
Racket

#lang racket/base
(require "syntax-flatten.rkt")
(provide generate-literals)
(define (literal-identifier? pat-datum)
(and (symbol? pat-datum)
(not (memq pat-datum '(... _))) ; isn't a reserved identifier
(let ([pat-str (symbol->string pat-datum)])
(or (not (regexp-match #rx"[A-Z]" pat-str)) ; either doesn't contain at least one uppercase letter ...
(not (equal? (string-upcase pat-str) pat-str)))))) ;... or doesn't contain all uppercase letters
;; generate literals for any symbols that are not ... or _ and not IN_CAPS
(define (generate-literals pats)
(for*/list ([pat-arg (in-list (syntax-flatten pats))]
[pat-datum (in-value (syntax->datum pat-arg))]
#:when (literal-identifier? pat-datum))
pat-arg))
(module+ test
(require rackunit)
(check-equal? (map syntax->datum (generate-literals #'(foo 42 BAR _ (... ...) bar <=> 3Bar 3bar))) '(foo bar <=> 3Bar 3bar)))