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;; eval.scm -- evaluation procedures
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Fri Feb 06, 2009 22:54
;; 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:
;; Module defining evaluation procedures called from the Emacs side.
;;; Code:
(define-module (geiser eval)
#:export (eval-in)
#:use-module (srfi srfi-1))
(define (eval-in form module-name)
"Evals FORM in the module designated by MODULE-NAME.
If MODULE-NAME is #f or resolution fails, the current module is used instead.
The result is a list of the form ((RESULT . <form-value>) (OUTPUT . <string>))
if no evaluation error happens, or ((ERROR (KEY . <error-key>) <error-arg>...))
in case of errors. Each error arg is a cons (NAME . VALUE), where NAME includes
SUBR, MSG and REST."
(let ((module (or (and module-name (resolve-module module-name))
(current-module))))
(catch #t
(lambda ()
(let* ((result #f)
(output (with-output-to-string
(lambda () (set! result (compile form module))))))
(list (cons 'result result) (cons 'output output))))
(lambda (key . args)
(list (cons 'error (apply parse-error (cons key args))))))))
(define (parse-error key . args)
(let* ((len (length args))
(subr (and (> len 0) (first args)))
(msg (and (> len 1) (second args)))
(margs (and (> len 2) (third args)))
(rest (and (> len 3) (fourth args))))
(list (cons 'key key)
(cons 'subr (or subr '()))
(cons 'msg (if msg (apply format (cons #f (cons msg margs))) '()))
(cons 'rest (or rest '())))))
(define (test-geiser) 4)
;;; eval.scm ends here
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