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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