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;; eval.ss -- evaluation
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun Apr 26, 2009 00:44
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Comentary:
;; Evaluation functions
;;; Code:
#lang scheme
(provide eval-in
compile-in
load-file
compile-file
macroexpand
make-repl-reader)
(require scheme/enter srfi/13)
(define last-result (void))
(define nowhere (open-output-nowhere))
(define (ensure-spec spec)
(cond ((symbol? spec) spec)
((not (string? spec)) #f)
((not (file-exists? spec)) #f)
((absolute-path? spec) `(file ,spec))
(else spec)))
(define (load-module spec . port)
(parameterize ((current-error-port (if (null? port) nowhere (car port))))
(eval #`(enter! #,spec))))
(define (ensure-namespace mod-spec)
(letrec ((spec (ensure-spec mod-spec))
(handler (lambda (e)
(load-module spec)
(enter! #f)
(module->namespace spec))))
(if spec
(with-handlers ((exn:fail:contract? handler))
(module->namespace spec))
(current-namespace))))
(define (namespace->module-path-name ns)
(let ((rmp (variable-reference->resolved-module-path
(eval '(#%variable-reference) ns))))
(and (resolved-module-path? rmp)
(resolved-module-path-name rmp))))
(define (namespace->module-name ns)
(let ((path (namespace->module-path-name ns)))
(if (not path)
"<top>"
(let* ((path (path->string path))
(cpaths (map path->string (current-library-collection-paths)))
(prefix-len (lambda (p)
(let ((pl (string-length p)))
(if (= pl (string-prefix-length p path)) pl 0))))
(lens (map prefix-len cpaths))
(real-path (substring path (apply max lens))))
(if (absolute-path? real-path)
(call-with-values (lambda () (split-path path))
(lambda (_ basename __) basename))
(regexp-replace "\\.[^./]*$" real-path ""))))))
(define last-namespace (make-parameter (current-namespace)))
(define (exn-key e)
(vector-ref (struct->vector e) 0))
(define (set-last-error e)
(set! last-result `((error (key . ,(exn-key e))
(subr)
(msg . ,(exn-message e))))))
(define (set-last-result v . vs)
(set! last-result `((result ,v ,@vs))))
(define (eval-in form spec)
(set-last-result (void))
(with-handlers ((exn? set-last-error))
(call-with-values
(lambda () (eval form (ensure-namespace spec)))
set-last-result))
last-result)
(define compile-in eval-in)
(define (load-file file)
(with-handlers ((exn? set-last-error))
(let ((current-path (namespace->module-path-name (last-namespace))))
(set-last-result
(string-append (with-output-to-string
(lambda ()
(load-module (ensure-spec file) (current-output-port))))
"done."))
(load-module (and (path? current-path)
(ensure-spec (path->string current-path))))))
last-result)
(define compile-file load-file)
(define (macroexpand form . all)
(let ((all (and (not (null? all)) (car all))))
(with-output-to-string
(lambda ()
(pretty-print (syntax->datum ((if all expand expand-once) form)))))))
(define (make-repl-reader builtin-reader)
(lambda (ns)
(last-namespace ns)
(printf "mzscheme@(~a)" (namespace->module-name ns))
(builtin-reader)))
;;; eval.ss ends here
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