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;; evaluation.scm -- evaluation, compilation and macro-expansion
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Mon Mar 02, 2009 02:46
;; 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:
;; Core evaluation engine.
;;; Code:
(define-module (geiser evaluation)
#:export (ge:eval
ge:compile
ge:macroexpand
ge:compile-file
ge:load-file)
#:use-module (srfi srfi-1)
#:use-module (system base compile)
#:use-module (system vm program)
#:use-module (ice-9 debugger utils)
#:use-module (ice-9 pretty-print))
(define (make-result result output)
(list (cons 'result result) (cons 'output output)))
(define (make-error key args stack)
(list (cons 'error (apply parse-error (cons key args)))
(cons 'stack (parse-stack stack))))
(define (parse-stack stack)
(if stack
(map (lambda (n) (parse-frame (stack-ref stack n)))
(iota (stack-length stack)))
'()))
(define (parse-frame frame)
(list (cons 'frame (frame-number frame))
(cons 'procedure (or (and (frame-procedure? frame)
(procedure-name (frame-procedure frame)))
'()))
(cons 'source (or (frame->source-position frame) '()))
(cons 'description (with-output-to-string
(lambda ()
(if (frame-procedure? frame)
(write-frame-short/application frame)
(write-frame-short/expression frame)))))))
(define (frame->source-position frame)
(let ((source (if (frame-procedure? frame)
(or (frame-source frame)
(let ((proc (frame-procedure frame)))
(and proc
(procedure? proc)
(procedure-source proc))))
(frame-source frame))))
(and source
(cond ((string? (source-property source 'filename))
(list (source-property source 'filename)
(+ 1 (source-property source 'line))
(source-property source 'column)))
((and (pair? source) (list? (cadr source)))
(list (caadr source)
(+ 1 (caddr source))
(cdddr source)))
(else #f)))))
(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 (evaluate form module-name evaluator)
(let ((module (or (and (list? module-name)
(resolve-module module-name))
(current-module)))
(result #f)
(captured-stack #f)
(error #f))
(let ((output
(with-output-to-string
(lambda ()
(set! result
(catch #t
(lambda ()
(start-stack 'id (evaluator form module)))
(lambda (key . args)
(set! error (make-error key args captured-stack)))
(lambda (key . args)
(set! captured-stack (make-stack #t 2 2)))))))))
(write (or error (make-result result output)))
(newline))))
(define (eval-compile form module)
(save-module-excursion
(lambda ()
(set-current-module module)
(compile form))))
(define (ge:eval form module-name)
(evaluate form module-name eval))
(define (ge:compile form module-name)
(evaluate form module-name eval-compile))
(define (ge:compile-file path)
"Compile and load file, given its full @var{path}."
(evaluate `(and (compile-file ,path)
(load-compiled ,(compiled-file-name path)))
#f
eval))
(define (ge:load-file path)
"Load file, given its full @var{path}."
(evaluate `(load ,path) #f eval))
(define (ge:macroexpand form . all)
(let ((all (and (not (null? all)) (car all))))
(with-output-to-string
(lambda ()
(pretty-print ((if all macroexpand macroexpand-1) form))))))
;;; evaluation.scm ends here
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