54 lines
1.7 KiB
Scheme
54 lines
1.7 KiB
Scheme
#lang scheme/base
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(require scheme/list)
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(provide read-module)
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(define (read-module [port (current-input-port)])
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`(lambda argv
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,@(let iter ([forms (read-forms port)]
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[bindings '()])
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(cond
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[(null? forms) (if (null? bindings)
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'()
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`(letrec ,bindings))]
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[(simple-declare-form? (first forms))
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(iter (cdr forms) (cons (cdr (first forms))
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bindings))]
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[(lambda-declare-form? (first forms))
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(iter (cdr forms) (cons `(,(first (second (first forms)))
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(lambda ,(cdr (second (first forms)))
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,@(cddr (first forms))))
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bindings))]
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[(begin-form? (first forms))
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(iter (append (cdr (first forms)) (cdr forms)) bindings)]
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[(null? bindings)
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(cons (first forms) (iter (cdr forms) '()))]
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[else
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`((letrec ,bindings ,@(iter forms '())))]))))
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(define (read-forms [port (current-input-port)])
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(reverse (let iter ([form (read port)]
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[forms '()])
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(if (eof-object? form)
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forms
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(iter (read port) (cons form forms))))))
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(define (simple-declare-form? form)
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(and (pair? form)
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(eq? (first form) 'declare)
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(symbol? (second form))
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(null? (cdddr form))))
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(define (lambda-declare-form? form)
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(and (pair? form)
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(eq? (first form) 'declare)
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(pair? (second form))
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(symbol? (first (second form)))))
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(define (begin-form? form)
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(and (pair? form)
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(eq? (first form) 'begin)))
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; vim:set sw=2 expandtab:
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