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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