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38 lines
1.7 KiB
Racket
38 lines
1.7 KiB
Racket
8 years ago
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#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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define-language-variable
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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) #'(define-syntax-parameter ID STX)]
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[(_ [ID VAL]) #'(define-syntax-parameter ID (λ (stx) #'VAL))]
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[(_ ID) #'(define-syntax-parameter ID
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(λ (stx) (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-rule (define-language-variable ID VAL)
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(br:define-syntax-parameter [ID VAL]))
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(define-syntax-rule (define-language-variables [ID VAL] ...)
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(begin (define-language-variable ID VAL) ...))
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(define-syntax (inject-language-variables stx)
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(syntax-case stx ()
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[(_ (VAR-PARAM ...) LANG-CODE ...)
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(with-syntax ([(HOLDS-ORIG-PARAM-VALUE ...) (generate-temporaries #'(VAR-PARAM ...))]
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[(INTERNAL-NAME ...) (generate-temporaries #'(VAR-PARAM ...))])
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;; need to use splicing expressions in a module-begin to compose with requires etc. that might be in lang code
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#'(splicing-let ([HOLDS-ORIG-PARAM-VALUE VAR-PARAM] ...)
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(splicing-syntax-parameterize
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([VAR-PARAM (make-rename-transformer #'INTERNAL-NAME)] ...)
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(define INTERNAL-NAME HOLDS-ORIG-PARAM-VALUE) ...
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(provide (rename-out [INTERNAL-NAME VAR-PARAM] ...))
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LANG-CODE ...)))]))
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