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47 lines
1.1 KiB
Racket
47 lines
1.1 KiB
Racket
11 years ago
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#lang racket/base
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(require racket/contract "../define/provide.rkt" "values.rkt")
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(define-syntax-rule (make-blame-handler try-proc expected-sym)
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(λ(b)
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(λ(x)
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(with-handlers ([exn:fail? (λ(e)
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(raise-blame-error
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b x
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'(expected: "~a" given: "~e")
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expected-sym x))])
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(try-proc x)))))
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(define+provide coerce/integer?
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(make-contract
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#:name 'coerce/integer?
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#:projection (make-blame-handler ->int 'can-be-integer?)))
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(define+provide coerce/string?
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(make-contract
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#:name 'coerce/string?
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#:projection (make-blame-handler ->string 'can-be-string?)))
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(define+provide coerce/symbol?
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(make-contract
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#:name 'coerce/symbol?
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#:projection (make-blame-handler ->symbol 'can-be-symbol?)))
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(define+provide coerce/path?
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(make-contract
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#:name 'coerce/path?
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#:projection (make-blame-handler ->path 'can-be-path?)))
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(define+provide coerce/boolean?
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(make-contract
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#:name 'coerce/boolean?
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#:projection (make-blame-handler ->boolean 'can-be-boolean?)))
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