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47 lines
1.4 KiB
Racket
47 lines
1.4 KiB
Racket
#lang racket/base
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(require (for-syntax racket/base racket/syntax) racket/contract "../define.rkt" "base.rkt")
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(define-syntax-rule (make-blame-handler PROC EXPECTED)
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(λ (b)
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(λ (x) (with-handlers ([exn:fail? (λ (exn)
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(raise-blame-error b x
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'(expected: "~a" given: "~e")
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EXPECTED x))])
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(PROC x)))))
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(provide+safe make-coercion-contract)
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(define-syntax (make-coercion-contract stx)
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(syntax-case stx ()
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[(_ STEM COERCE-PROC)
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(with-syntax ([COERCE/STEM? (format-id stx "coerce/~a?" #'STEM)]
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[STEMISH? (format-id stx "~aish?" #'STEM)])
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#'(make-contract
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#:name 'COERCE/STEM?
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#:projection (make-blame-handler COERCE-PROC 'STEMISH?)))]
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[(MACRO-NAME STEM)
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(with-syntax ([->STEM (format-id stx "->~a" #'STEM)])
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#'(MACRO-NAME STEM ->STEM))]))
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(define-syntax (define+provide-coercion-contract stx)
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(syntax-case stx ()
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[(_ STEM)
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(with-syntax ([COERCE/STEM? (format-id stx "coerce/~a?" #'STEM)])
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#'(begin
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(provide+safe COERCE/STEM?)
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(define COERCE/STEM? (make-coercion-contract STEM))))]))
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(define-syntax-rule (define+provide-coercion-contracts STEM ...)
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(begin (define+provide-coercion-contract STEM) ...))
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(define+provide-coercion-contracts int
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string
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symbol
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path
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boolean
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list)
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