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31 lines
1.3 KiB
Racket
31 lines
1.3 KiB
Racket
#lang racket/base
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(require (for-syntax racket/base) racket/stxparam racket/splicing)
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(provide splicing-syntax-parameterize
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define-syntax-parameters
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define-language-variables
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inject-language-variables
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(rename-out [br:define-syntax-parameter define-syntax-parameter]))
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(define-syntax (br:define-syntax-parameter stx)
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(syntax-case stx ()
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[(_ ID STX)
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#'(define-syntax-parameter ID STX)]
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[(_ ID)
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#'(define-syntax-parameter ID (λ (stx)
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(raise-syntax-error (syntax-e stx) "parameter not set")))]))
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(define-syntax-rule (define-syntax-parameters ID ...)
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(begin (br:define-syntax-parameter ID) ...))
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(define-syntax define-language-variables (make-rename-transformer #'define-syntax-parameters))
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(define-syntax (inject-language-variables stx)
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(syntax-case stx ()
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[(_ ([VAR-PARAM INITIAL-VALUE] ...) LANG-CODE ...)
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(with-syntax ([(INTERNAL-NAME ...) (generate-temporaries #'(VAR-PARAM ...))])
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#'(splicing-syntax-parameterize ;; need to use splicing version in a module-begin to compose with requires etc. that might be in lang code
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([VAR-PARAM (make-rename-transformer #'INTERNAL-NAME)] ...)
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(define INTERNAL-NAME INITIAL-VALUE) ...
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(provide (rename-out [INTERNAL-NAME VAR-PARAM] ...))
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LANG-CODE ...))]))
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