Started a port of Skribe to Guile.

* src/guile:  New directory.  Contains the beginning of a Guile implementation
  that borrows most of its code to the STkLos implementation of Skribe.



git-archimport-id: lcourtes@laas.fr--2004-libre/skribilo--devel--1.2--patch-4

1 files changed, 249 insertions, 0 deletions

diff --git a/src/guile/skribe/engine.scm b/src/guile/skribe/engine.scm
new file mode 100644
index 0000000..1cac168
--- /dev/null
+++ b/src/guile/skribe/engine.scm
@@ -0,0 +1,249 @@
+;;;;
+;;;; engines.stk	-- Skribe Engines Stuff
+;;;; 
+;;;; Copyright © 2003-2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
+;;;; USA.
+;;;; 
+;;;;           Author: Erick Gallesio [eg@essi.fr]
+;;;;    Creation date: 24-Jul-2003 20:33 (eg)
+;;;; Last file update: 28-Oct-2004 21:21 (eg)
+;;;;
+
+(define-module (skribe engine)
+  :use-module (skribe debug)
+;  :use-module (skribe eval)
+  :use-module (skribe writer)
+  :use-module (skribe types)
+
+  :use-module (oop goops)
+  :use-module (ice-9 optargs)
+ 
+  :export (default-engine default-engine-set!
+	   make-engine copy-engine find-engine
+	   engine-custom engine-custom-set!
+	   engine-format? engine-add-writer!
+	   processor-get-engine
+	   push-default-engine pop-default-engine))
+
+
+
+
+;;; Module definition is split here because this file is read by the documentation
+;;; Should be changed.
+;(select-module SKRIBE-ENGINE-MODULE)
+
+(define *engines*		'())
+(define *default-engine* 	#f)
+(define *default-engines* 	'())
+
+
+(define (default-engine)
+   *default-engine*)
+
+
+(define (default-engine-set! e)
+  (unless (engine? e)
+    (skribe-error 'default-engine-set! "bad engine ~S" e))
+  (set! *default-engine* e)
+  (set! *default-engines* (cons e *default-engines*))
+  e)
+
+
+(define (push-default-engine e)
+   (set! *default-engines* (cons e *default-engines*))
+   (default-engine-set! e))
+
+(define (pop-default-engine)
+   (if (null? *default-engines*)
+       (skribe-error 'pop-default-engine "Empty engine stack" '())
+       (begin
+	  (set! *default-engines* (cdr *default-engines*))
+	  (if (pair? *default-engines*)
+	      (default-engine-set! (car *default-engines*))
+	      (set! *default-engine* #f)))))
+
+
+(define (processor-get-engine combinator newe olde)
+  (cond
+    ((procedure? combinator)
+     (combinator newe olde))
+    ((engine? newe)
+     newe)
+    (else
+     olde)))
+
+
+(define (engine-format? fmt . e)
+  (let ((e (cond
+	     ((pair? e) (car e))
+	     ((engine? *skribe-engine*) *skribe-engine*)
+	     (else (find-engine *skribe-engine*)))))
+    (if (not (engine? e))
+	(skribe-error 'engine-format? "No engine" e)
+	(string=? fmt (engine-format e)))))
+
+;;;
+;;; MAKE-ENGINE
+;;; 
+(define* (make-engine ident #:key (version 'unspecified)
+		     		(format "raw")
+				(filter #f)
+				(delegate #f)
+				(symbol-table '())
+				(custom '())
+				(info '()))
+  (let ((e (make <engine> :ident ident :version version :format format
+		 	  :filter filter :delegate delegate
+			  :symbol-table symbol-table
+			  :custom custom :info info)))
+    ;; store the engine in the global table
+    (set! *engines* (cons e *engines*))
+    ;; return it
+    e))
+
+
+;;;
+;;; COPY-ENGINE
+;;;
+(define* (copy-engine ident e #:key (version 'unspecified)
+				  (filter #f)
+				  (delegate #f)
+				  (symbol-table #f)
+				  (custom #f))
+  (let ((new (shallow-clone e)))
+    (slot-set! new 'ident 	 ident)
+    (slot-set! new 'version 	 version)
+    (slot-set! new 'filter	 (or filter (slot-ref e 'filter)))
+    (slot-set! new 'delegate	 (or delegate (slot-ref e 'delegate)))
+    (slot-set! new 'symbol-table (or symbol-table (slot-ref e 'symbol-table)))
+    (slot-set! new 'customs	 (or custom (slot-ref e 'customs)))
+
+    (set! *engines* (cons new *engines*))
+    new))
+
+
+;;;
+;;; 	FIND-ENGINE
+;;;
+(define (%find-loaded-engine id version)
+  (let Loop ((es *engines*))
+    (cond
+      ((null? es) #f)
+      ((eq? (slot-ref (car es) 'ident) id)
+       (cond
+	   ((eq? version 'unspecified) 		       (car es))
+	   ((eq? version (slot-ref (car es) 'version)) (car es))
+	   (else			 	       (Loop (cdr es)))))
+      (else (loop (cdr es))))))
+
+
+(define* (find-engine id #:key (version 'unspecified))
+  (with-debug 5 'find-engine
+     (debug-item "id=" id " version=" version)
+
+     (or (%find-loaded-engine id version)
+	 (let ((c (assq id *skribe-auto-load-alist*)))
+	   (debug-item "c=" c)
+	   (if (and c (string? (cdr c)))
+	       (begin
+		 (skribe-load (cdr c) :engine 'base)
+		 (%find-loaded-engine id version))
+	       #f)))))
+
+;;;
+;;; ENGINE-CUSTOM
+;;;
+(define (engine-custom e id)
+  (let* ((customs (slot-ref e 'customs))
+	 (c       (assq id customs)))
+    (if (pair? c)
+	(cadr c)
+	'unspecified)))
+
+
+;;;
+;;; ENGINE-CUSTOM-SET!
+;;;
+(define (engine-custom-set! e id val)
+  (let* ((customs (slot-ref e 'customs))
+	 (c       (assq id customs)))
+    (if (pair? c)
+	(set-car! (cdr c) val)
+	(slot-set! e 'customs (cons (list id val) customs)))))
+
+
+;;;
+;;; ENGINE-ADD-WRITER!
+;;;
+(define (engine-add-writer! e ident pred upred opt before action after class valid)
+  (define (check-procedure name proc arity)
+    (cond
+      ((not (procedure? proc))
+         (skribe-error ident "Illegal procedure" proc))
+      ((not (equal? (%procedure-arity proc) arity))
+         (skribe-error ident
+		       (format #f "Illegal ~S procedure" name)
+		       proc))))
+
+  (define (check-output name proc)
+    (and proc (or (string? proc) (check-procedure name proc 2))))
+
+  ;;
+  ;; Engine-add-writer! starts here
+  ;;
+  (unless (is-a? e <engine>)
+    (skribe-error ident "Illegal engine" e))
+  
+  ;; check the options
+  (unless (or (eq? opt 'all) (list? opt))
+    (skribe-error ident "Illegal options" opt))
+  
+  ;; check the correctness of the predicate
+  (check-procedure "predicate" pred 2)
+
+  ;; check the correctness of the validation proc
+  (when valid
+    (check-procedure "validate" valid 2))
+  
+  ;; check the correctness of the three actions
+  (check-output "before" before)
+  (check-output "action" action)
+  (check-output "after" after)
+
+  ;; create a new writer and bind it
+  (let ((n (make <writer>
+	     :ident (if (symbol? ident) ident 'all)
+	     :class class :pred pred :upred upred :options opt
+	     :before before :action action :after after
+	     :validate valid)))
+    (slot-set! e 'writers (cons n (slot-ref e 'writers)))
+    n))
+
+;;;; ======================================================================
+;;;;
+;;;;   				    I N I T S
+;;;;
+;;;; ======================================================================
+
+;; A base engine must pre-exist before anything is loaded. In
+;; particular, this dummy base engine is used to load the actual
+;; definition of base. 
+
+(make-engine 'base :version 'bootstrap)
+
+