Reduced reliance on the debugging evaluator (improves performance).

* src/guile/skribilo.scm (skribilo): Do not impose use of the debugging
  evaluator, allowing for significant performance improvements.

* src/guile/skribilo/evaluator.scm (%evaluate): Use the debugging
  evaluator when evaluating EXPR.

* src/guile/skribilo/location.scm (invocation-location): Return `#f' when
  the debugging evaluator is not being used.

git-archimport-id: skribilo@sv.gnu.org--2006/skribilo--devo--1.2--patch-82

3 files changed, 55 insertions, 56 deletions

diff --git a/src/guile/skribilo.scm b/src/guile/skribilo.scm
index 531b0fb..106fc71 100644
--- a/src/guile/skribilo.scm
+++ b/src/guile/skribilo.scm
@@ -4,34 +4,34 @@ main='(module-ref (resolve-module '\''(skribilo)) '\'main')'
 exec ${GUILE-guile} --debug -l $0 -c "(apply $main (cdr (command-line)))" "$@"
 !#
 
-;;;; skribilo.scm
-;;;;
-;;;; Copyright © 2003-2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
-;;;; Copyright 2005, 2006  Ludovic Courtès <ludovic.courtes@laas.fr>
-;;;;
-;;;;
-;;;; This program 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 2 of the License, or
-;;;; (at your option) any later version.
-;;;;
-;;;; This program 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, write to the Free Software
-;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-;;;; USA.
-
-;;;; Commentary:
-;;;;
-;;;; Usage: skribilo [ARGS]
-;;;;
-;;;; Process a skribilo document.
-;;;;
-;;;; Code:
+;;; skribilo.scm  --  The Skribilo document processor.
+;;;
+;;; Copyright 2003, 2004  Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
+;;; Copyright 2005, 2006, 2007  Ludovic Courtès <ludovic.courtes@laas.fr>
+;;;
+;;;
+;;; This program 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 2 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; This program 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, write to the Free Software
+;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+;;; USA.
+
+;;; Commentary:
+;;;
+;;; Usage: skribilo [ARGS]
+;;;
+;;; Process a skribilo document.
+;;;
+;;; Code:
 
 
 
@@ -406,11 +406,6 @@ Processes a Skribilo/Skribe source file and produces its output.
 	 (help-wanted       (option-ref options 'help #f))
 	 (version-wanted    (option-ref options 'version #f)))
 
-    ;; Set up the debugging infrastructure.
-    (debug-enable 'debug)
-    (debug-enable 'backtrace)
-    (debug-enable 'procnames)
-
     (cond (help-wanted    (begin (skribilo-show-help) (exit 1)))
 	  (version-wanted (begin (skribilo-show-version) (exit 1))))
 
diff --git a/src/guile/skribilo/evaluator.scm b/src/guile/skribilo/evaluator.scm
index 0598c86..3e984fc 100644
--- a/src/guile/skribilo/evaluator.scm
+++ b/src/guile/skribilo/evaluator.scm
@@ -62,16 +62,18 @@
   ;; Evaluate EXPR in the current module.  EXPR is an arbitrary S-expression
   ;; that may contain calls to the markup functions defined in a markup
   ;; package such as `(skribilo package base)', e.g., `(bold "hello")'.
-  (let ((result (eval expr module)))
-    (if (ast? result)
-        (let ((file (source-property expr 'filename))
-              (line (source-property expr 'line))
-              (column (source-property expr 'column)))
-          (slot-set! result 'loc
-                     (make <location>
-                       :file file :line line :pos column))))
-
-    result))
+  (let ((opts (debug-options)))
+    (dynamic-wind
+        (lambda ()
+          ;; Force use of the debugging evaluator so that we can track source
+          ;; location.
+          (debug-enable 'debug)
+          (debug-enable 'backtrace))
+        (lambda ()
+          (eval expr module))
+        (lambda ()
+          ;; Restore previous evaluator options.
+          (debug-options opts)))))
 
 
 ;;;
diff --git a/src/guile/skribilo/location.scm b/src/guile/skribilo/location.scm
index 6c23f76..e4583ff 100644
--- a/src/guile/skribilo/location.scm
+++ b/src/guile/skribilo/location.scm
@@ -79,19 +79,21 @@
 
 (define (invocation-location . depth)
   ;; Return a location object denoting the place of invocation of this
-  ;; function's caller.
-  (let ((depth (if (null? depth) 4 (car depth))))
-    (let* ((stack  (make-stack #t))
-           (frame  (stack-ref stack depth))
-           (source (frame-source frame)))
-      (and source
-           (let ((file (source-property source 'filename))
-                 (line (source-property source 'line))
-                 (col  (source-property source 'column)))
-             (and file
-                  (make <location> :file file
-                        :line (and line (+ line 1))
-                        :column col)))))))
+  ;; function's caller.  Debugging must be enable for this to work, via
+  ;; `(debug-enable 'debug)', otherwise `#f' is returned.
+  (let ((depth (if (null? depth) 4 (car depth)))
+        (stack (make-stack #t)))
+    (and stack
+         (let* ((frame  (stack-ref stack depth))
+                (source (frame-source frame)))
+           (and source
+                (let ((file (source-property source 'filename))
+                      (line (source-property source 'line))
+                      (col  (source-property source 'column)))
+                  (and file
+                       (make <location> :file file
+                             :line (and line (+ line 1))
+                             :column col))))))))
 
 ;;; arch-tag: d68fa45d-a200-465e-a3c2-eb2861907f83