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b/beautiful-racket-lib/br/stxparam.rkt new file mode 100644 index 0000000..b94d993 --- /dev/null +++ b/beautiful-racket-lib/br/stxparam.rkt @@ -0,0 +1,34 @@ +#lang racket/base +(require (for-syntax racket/base syntax/parse) syntax/strip-context) +(provide (all-defined-out) (all-from-out syntax/strip-context)) + + +(define-syntax (syntax-match stx) + (syntax-case stx (syntax) + [(_ stx-arg [(syntax pattern) body ...] ...) + #'(syntax-case stx-arg () + [pattern body ...] ...)])) + +(define-syntax (add-syntax stx) + ;; todo: permit mixing of two-arg and one-arg binding forms + ;; one-arg form allows you to inject an existing syntax object using its current name + (syntax-case stx (syntax) + [(_ ([(syntax sid) sid-stx] ...) body ...) + #'(with-syntax ([sid sid-stx] ...) body ...)] + ;; todo: limit `sid` to be an identifier + [(_ ([sid] ...) body ...) + #'(with-syntax ([sid sid] ...) body ...)])) + +(define-syntax syntax-let (make-rename-transformer #'add-syntax)) + +(define-syntax inject-syntax (make-rename-transformer #'add-syntax)) + +(define-syntax (map-syntax stx) + (syntax-case stx () + [(_ ...) + #'(map (if (and (syntax? ) (list? (syntax-e ))) + (syntax->list ) + ) ...)])) + + +#;(define-syntax syntax-variable (make-rename-transformer #'format-id)) \ No newline at end of file diff --git a/beautiful-racket/br/demo/basic/expander.rkt b/beautiful-racket/br/demo/basic/expander.rkt index 2864387..2980fe3 100644 --- a/beautiful-racket/br/demo/basic/expander.rkt +++ b/beautiful-racket/br/demo/basic/expander.rkt @@ -5,18 +5,19 @@ (all-defined-out)) (require (for-syntax racket/syntax racket/list br/datum)) -(require racket/stxparam) +(require racket/stxparam racket/splicing) (define-syntax-parameter A (λ (stx) - (raise-syntax-error (syntax-e stx) "can only be used inside the place"))) + (raise-syntax-error (syntax-e stx) "parameter not set"))) (define #'(basic-module-begin PARSE-TREE ...) #'(#%module-begin - (let ([A-inner 0]) - (syntax-parameterize - ([A (make-rename-transformer #'A-inner)]) - (println (quote PARSE-TREE ...)) - PARSE-TREE ...)))) + (splicing-syntax-parameterize + ([A (make-rename-transformer #'A-var)]) + (define A-var 0) + (provide (rename-out [A-var A])) + (println (quote PARSE-TREE ...)) + PARSE-TREE ...))) ; #%app and #%datum have to be present to make #%top work (define #'(basic-top . id)