From 7efd05778cddec0293e0d48199f3aeee2aad6178 Mon Sep 17 00:00:00 2001
From: Ludovic Courtès
Date: Fri, 18 Jan 2008 12:36:59 +0100
Subject: Add SILex, for simplicity.

---
 src/guile/silex/util.scm | 502 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 502 insertions(+)
 create mode 100644 src/guile/silex/util.scm

(limited to 'src/guile/silex/util.scm')

diff --git a/src/guile/silex/util.scm b/src/guile/silex/util.scm
new file mode 100644
index 0000000..3259c06
--- /dev/null
+++ b/src/guile/silex/util.scm
@@ -0,0 +1,502 @@
+; SILex - Scheme Implementation of Lex
+; Copyright (C) 2001  Danny Dube'
+; 
+; 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.
+
+;
+; Quelques definitions de constantes
+;
+
+(define eof-tok              0)
+(define hblank-tok           1)
+(define vblank-tok           2)
+(define pipe-tok             3)
+(define question-tok         4)
+(define plus-tok             5)
+(define star-tok             6)
+(define lpar-tok             7)
+(define rpar-tok             8)
+(define dot-tok              9)
+(define lbrack-tok          10)
+(define lbrack-rbrack-tok   11)
+(define lbrack-caret-tok    12)
+(define lbrack-minus-tok    13)
+(define subst-tok           14)
+(define power-tok           15)
+(define doublequote-tok     16)
+(define char-tok            17)
+(define caret-tok           18)
+(define dollar-tok          19)
+(define <<EOF>>-tok         20)
+(define <<ERROR>>-tok       21)
+(define percent-percent-tok 22)
+(define id-tok              23)
+(define rbrack-tok          24)
+(define minus-tok           25)
+(define illegal-tok         26)
+; Tokens agreges
+(define class-tok           27)
+(define string-tok          28)
+
+(define number-of-tokens 29)
+
+(define newline-ch   (char->integer #\newline))
+(define tab-ch       (char->integer #\	))
+(define dollar-ch    (char->integer #\$))
+(define minus-ch     (char->integer #\-))
+(define rbrack-ch    (char->integer #\]))
+(define caret-ch     (char->integer #\^))
+
+(define dot-class (list (cons 'inf- (- newline-ch 1))
+			(cons (+ newline-ch 1) 'inf+)))
+
+(define default-action
+  (string-append "        (yycontinue)" (string #\newline)))
+(define default-<<EOF>>-action
+  (string-append "       '(0)" (string #\newline)))
+(define default-<<ERROR>>-action
+  (string-append "       (begin"
+		 (string #\newline)
+		 "         (display \"Error: Invalid token.\")"
+		 (string #\newline)
+		 "         (newline)"
+		 (string #\newline)
+		 "         'error)"
+		 (string #\newline)))
+
+
+
+
+;
+; Fabrication de tables de dispatch
+;
+
+(define make-dispatch-table
+  (lambda (size alist default)
+    (let ((v (make-vector size default)))
+      (let loop ((alist alist))
+	(if (null? alist)
+	    v
+	    (begin
+	      (vector-set! v (caar alist) (cdar alist))
+	      (loop (cdr alist))))))))
+
+
+
+
+;
+; Fonctions de manipulation des tokens
+;
+
+(define make-tok
+  (lambda (tok-type lexeme line column . attr)
+    (cond ((null? attr)
+	   (vector tok-type line column lexeme))
+	  ((null? (cdr attr))
+	   (vector tok-type line column lexeme (car attr)))
+	  (else
+	   (vector tok-type line column lexeme (car attr) (cadr attr))))))
+
+(define get-tok-type     (lambda (tok) (vector-ref tok 0)))
+(define get-tok-line     (lambda (tok) (vector-ref tok 1)))
+(define get-tok-column   (lambda (tok) (vector-ref tok 2)))
+(define get-tok-lexeme   (lambda (tok) (vector-ref tok 3)))
+(define get-tok-attr     (lambda (tok) (vector-ref tok 4)))
+(define get-tok-2nd-attr (lambda (tok) (vector-ref tok 5)))
+
+
+
+
+;
+; Fonctions de manipulations des regles
+;
+
+(define make-rule
+  (lambda (line eof? error? bol? eol? regexp action)
+    (vector line eof? error? bol? eol? regexp action #f)))
+
+(define get-rule-line    (lambda (rule) (vector-ref rule 0)))
+(define get-rule-eof?    (lambda (rule) (vector-ref rule 1)))
+(define get-rule-error?  (lambda (rule) (vector-ref rule 2)))
+(define get-rule-bol?    (lambda (rule) (vector-ref rule 3)))
+(define get-rule-eol?    (lambda (rule) (vector-ref rule 4)))
+(define get-rule-regexp  (lambda (rule) (vector-ref rule 5)))
+(define get-rule-action  (lambda (rule) (vector-ref rule 6)))
+(define get-rule-yytext? (lambda (rule) (vector-ref rule 7)))
+
+(define set-rule-regexp  (lambda (rule regexp)  (vector-set! rule 5 regexp)))
+(define set-rule-action  (lambda (rule action)  (vector-set! rule 6 action)))
+(define set-rule-yytext? (lambda (rule yytext?) (vector-set! rule 7 yytext?)))
+
+
+
+
+;
+; Noeuds des regexp
+;
+
+(define epsilon-re  0)
+(define or-re       1)
+(define conc-re     2)
+(define star-re     3)
+(define plus-re     4)
+(define question-re 5)
+(define class-re    6)
+(define char-re     7)
+
+(define make-re
+  (lambda (re-type . lattr)
+    (cond ((null? lattr)
+	   (vector re-type))
+	  ((null? (cdr lattr))
+	   (vector re-type (car lattr)))
+	  ((null? (cddr lattr))
+	   (vector re-type (car lattr) (cadr lattr))))))
+
+(define get-re-type  (lambda (re) (vector-ref re 0)))
+(define get-re-attr1 (lambda (re) (vector-ref re 1)))
+(define get-re-attr2 (lambda (re) (vector-ref re 2)))
+
+
+
+
+;
+; Fonctions de manipulation des ensembles d'etats
+;
+
+; Intersection de deux ensembles d'etats
+(define ss-inter
+  (lambda (ss1 ss2)
+    (cond ((null? ss1)
+	   '())
+	  ((null? ss2)
+	   '())
+	  (else
+	   (let ((t1 (car ss1))
+		 (t2 (car ss2)))
+	     (cond ((< t1 t2)
+		    (ss-inter (cdr ss1) ss2))
+		   ((= t1 t2)
+		    (cons t1 (ss-inter (cdr ss1) (cdr ss2))))
+		   (else
+		    (ss-inter ss1 (cdr ss2)))))))))
+
+; Difference entre deux ensembles d'etats
+(define ss-diff
+  (lambda (ss1 ss2)
+    (cond ((null? ss1)
+	   '())
+	  ((null? ss2)
+	   ss1)
+	  (else
+	   (let ((t1 (car ss1))
+		 (t2 (car ss2)))
+	     (cond ((< t1 t2)
+		    (cons t1 (ss-diff (cdr ss1) ss2)))
+		   ((= t1 t2)
+		    (ss-diff (cdr ss1) (cdr ss2)))
+		   (else
+		    (ss-diff ss1 (cdr ss2)))))))))
+
+; Union de deux ensembles d'etats
+(define ss-union
+  (lambda (ss1 ss2)
+    (cond ((null? ss1)
+	   ss2)
+	  ((null? ss2)
+	   ss1)
+	  (else
+	   (let ((t1 (car ss1))
+		 (t2 (car ss2)))
+	     (cond ((< t1 t2)
+		    (cons t1 (ss-union (cdr ss1) ss2)))
+		   ((= t1 t2)
+		    (cons t1 (ss-union (cdr ss1) (cdr ss2))))
+		   (else
+		    (cons t2 (ss-union ss1 (cdr ss2))))))))))
+
+; Decoupage de deux ensembles d'etats
+(define ss-sep
+  (lambda (ss1 ss2)
+    (let loop ((ss1 ss1) (ss2 ss2) (l '()) (c '()) (r '()))
+      (if (null? ss1)
+	  (if (null? ss2)
+	      (vector (reverse l) (reverse c) (reverse r))
+	      (loop ss1 (cdr ss2) l c (cons (car ss2) r)))
+	  (if (null? ss2)
+	      (loop (cdr ss1) ss2 (cons (car ss1) l) c r)
+	      (let ((t1 (car ss1))
+		    (t2 (car ss2)))
+		(cond ((< t1 t2)
+		       (loop (cdr ss1) ss2 (cons t1 l) c r))
+		      ((= t1 t2)
+		       (loop (cdr ss1) (cdr ss2) l (cons t1 c) r))
+		      (else
+		       (loop ss1 (cdr ss2) l c (cons t2 r))))))))))
+
+
+
+
+;
+; Fonctions de manipulation des classes de caracteres
+;
+
+; Comparaisons de bornes d'intervalles
+(define class-= eqv?)
+
+(define class-<=
+  (lambda (b1 b2)
+    (cond ((eq? b1 'inf-) #t)
+	  ((eq? b2 'inf+) #t)
+	  ((eq? b1 'inf+) #f)
+	  ((eq? b2 'inf-) #f)
+	  (else (<= b1 b2)))))
+
+(define class->=
+  (lambda (b1 b2)
+    (cond ((eq? b1 'inf+) #t)
+	  ((eq? b2 'inf-) #t)
+	  ((eq? b1 'inf-) #f)
+	  ((eq? b2 'inf+) #f)
+	  (else (>= b1 b2)))))
+
+(define class-<
+  (lambda (b1 b2)
+    (cond ((eq? b1 'inf+) #f)
+	  ((eq? b2 'inf-) #f)
+	  ((eq? b1 'inf-) #t)
+	  ((eq? b2 'inf+) #t)
+	  (else (< b1 b2)))))
+
+(define class->
+  (lambda (b1 b2)
+    (cond ((eq? b1 'inf-) #f)
+	  ((eq? b2 'inf+) #f)
+	  ((eq? b1 'inf+) #t)
+	  ((eq? b2 'inf-) #t)
+	  (else (> b1 b2)))))
+
+; Complementation d'une classe
+(define class-compl
+  (lambda (c)
+    (let loop ((c c) (start 'inf-))
+      (if (null? c)
+	  (list (cons start 'inf+))
+	  (let* ((r (car c))
+		 (rstart (car r))
+		 (rend (cdr r)))
+	    (if (class-< start rstart)
+		(cons (cons start (- rstart 1))
+		      (loop c rstart))
+		(if (class-< rend 'inf+)
+		    (loop (cdr c) (+ rend 1))
+		    '())))))))
+
+; Union de deux classes de caracteres
+(define class-union
+  (lambda (c1 c2)
+    (let loop ((c1 c1) (c2 c2) (u '()))
+      (if (null? c1)
+	  (if (null? c2)
+	      (reverse u)
+	      (loop c1 (cdr c2) (cons (car c2) u)))
+	  (if (null? c2)
+	      (loop (cdr c1) c2 (cons (car c1) u))
+	      (let* ((r1 (car c1))
+		     (r2 (car c2))
+		     (r1start (car r1))
+		     (r1end (cdr r1))
+		     (r2start (car r2))
+		     (r2end (cdr r2)))
+		(if (class-<= r1start r2start)
+		    (cond ((class-= r1end 'inf+)
+			   (loop c1 (cdr c2) u))
+			  ((class-< (+ r1end 1) r2start)
+			   (loop (cdr c1) c2 (cons r1 u)))
+			  ((class-<= r1end r2end)
+			   (loop (cdr c1)
+				 (cons (cons r1start r2end) (cdr c2))
+				 u))
+			  (else
+			   (loop c1 (cdr c2) u)))
+		    (cond ((class-= r2end 'inf+)
+			   (loop (cdr c1) c2 u))
+			  ((class-> r1start (+ r2end 1))
+			   (loop c1 (cdr c2) (cons r2 u)))
+			  ((class->= r1end r2end)
+			   (loop (cons (cons r2start r1end) (cdr c1))
+				 (cdr c2)
+				 u))
+			  (else
+			   (loop (cdr c1) c2 u))))))))))
+
+; Decoupage de deux classes de caracteres
+(define class-sep
+  (lambda (c1 c2)
+    (let loop ((c1 c1) (c2 c2) (l '()) (c '()) (r '()))
+      (if (null? c1)
+	  (if (null? c2)
+	      (vector (reverse l) (reverse c) (reverse r))
+	      (loop c1 (cdr c2) l c (cons (car c2) r)))
+	  (if (null? c2)
+	      (loop (cdr c1) c2 (cons (car c1) l) c r)
+	      (let* ((r1 (car c1))
+		     (r2 (car c2))
+		     (r1start (car r1))
+		     (r1end (cdr r1))
+		     (r2start (car r2))
+		     (r2end (cdr r2)))
+		(cond ((class-< r1start r2start)
+		       (if (class-< r1end r2start)
+			   (loop (cdr c1) c2 (cons r1 l) c r)
+			   (loop (cons (cons r2start r1end) (cdr c1)) c2
+				 (cons (cons r1start (- r2start 1)) l) c r)))
+		      ((class-> r1start r2start)
+		       (if (class-> r1start r2end)
+			   (loop c1 (cdr c2) l c (cons r2 r))
+			   (loop c1 (cons (cons r1start r2end) (cdr c2))
+				 l c (cons (cons r2start (- r1start 1)) r))))
+		      (else
+		       (cond ((class-< r1end r2end)
+			      (loop (cdr c1)
+				    (cons (cons (+ r1end 1) r2end) (cdr c2))
+				    l (cons r1 c) r))
+			     ((class-= r1end r2end)
+			      (loop (cdr c1) (cdr c2) l (cons r1 c) r))
+			     (else
+			      (loop (cons (cons (+ r2end 1) r1end) (cdr c1))
+				    (cdr c2)
+				    l (cons r2 c) r)))))))))))
+
+; Transformer une classe (finie) de caracteres en une liste de ...
+(define class->char-list
+  (lambda (c)
+    (let loop1 ((c c))
+      (if (null? c)
+	  '()
+	  (let* ((r (car c))
+		 (rend (cdr r))
+		 (tail (loop1 (cdr c))))
+	    (let loop2 ((rstart (car r)))
+	      (if (<= rstart rend)
+		  (cons (integer->char rstart) (loop2 (+ rstart 1)))
+		  tail)))))))
+
+; Transformer une classe de caracteres en une liste poss. compl.
+; 1er element = #t -> classe complementee
+(define class->tagged-char-list
+  (lambda (c)
+    (let* ((finite? (or (null? c) (number? (caar c))))
+	   (c2 (if finite? c (class-compl c)))
+	   (c-l (class->char-list c2)))
+      (cons (not finite?) c-l))))
+
+
+
+
+;
+; Fonction digraph
+;
+
+; Fonction "digraph".
+; Etant donne un graphe dirige dont les noeuds comportent une valeur,
+; calcule pour chaque noeud la "somme" des valeurs contenues dans le
+; noeud lui-meme et ceux atteignables a partir de celui-ci.  La "somme"
+; consiste a appliquer un operateur commutatif et associatif aux valeurs
+; lorsqu'elles sont additionnees.
+; L'entree consiste en un vecteur de voisinages externes, un autre de
+; valeurs initiales et d'un operateur.
+; La sortie est un vecteur de valeurs finales.
+(define digraph
+  (lambda (arcs init op)
+    (let* ((nbnodes (vector-length arcs))
+	   (infinity nbnodes)
+	   (prio (make-vector nbnodes -1))
+	   (stack (make-vector nbnodes #f))
+	   (sp 0)
+	   (final (make-vector nbnodes #f)))
+      (letrec ((store-final
+		(lambda (self-sp value)
+		  (let loop ()
+		    (if (> sp self-sp)
+			(let ((voisin (vector-ref stack (- sp 1))))
+			  (vector-set! prio voisin infinity)
+			  (set! sp (- sp 1))
+			  (vector-set! final voisin value)
+			  (loop))))))
+	       (visit-node
+		(lambda (n)
+		  (let ((self-sp sp))
+		    (vector-set! prio n self-sp)
+		    (vector-set! stack sp n)
+		    (set! sp (+ sp 1))
+		    (vector-set! final n (vector-ref init n))
+		    (let loop ((vois (vector-ref arcs n)))
+		      (if (pair? vois)
+			  (let* ((v (car vois))
+				 (vprio (vector-ref prio v)))
+			    (if (= vprio -1)
+				(visit-node v))
+			    (vector-set! prio n (min (vector-ref prio n)
+						     (vector-ref prio v)))
+			    (vector-set! final n (op (vector-ref final n)
+						     (vector-ref final v)))
+			    (loop (cdr vois)))))
+		    (if (= (vector-ref prio n) self-sp)
+			(store-final self-sp (vector-ref final n)))))))
+	(let loop ((n 0))
+	  (if (< n nbnodes)
+	      (begin
+		(if (= (vector-ref prio n) -1)
+		    (visit-node n))
+		(loop (+ n 1)))))
+	final))))
+
+
+
+
+;
+; Fonction de tri
+;
+
+(define merge-sort-merge
+  (lambda (l1 l2 cmp-<=)
+    (cond ((null? l1)
+	   l2)
+	  ((null? l2)
+	   l1)
+	  (else
+	   (let ((h1 (car l1))
+		 (h2 (car l2)))
+	     (if (cmp-<= h1 h2)
+		 (cons h1 (merge-sort-merge (cdr l1) l2 cmp-<=))
+		 (cons h2 (merge-sort-merge l1 (cdr l2) cmp-<=))))))))
+
+(define merge-sort
+  (lambda (l cmp-<=)
+    (if (null? l)
+	l
+	(let loop1 ((ll (map list l)))
+	  (if (null? (cdr ll))
+	      (car ll)
+	      (loop1
+	       (let loop2 ((ll ll))
+		 (cond ((null? ll)
+			ll)
+		       ((null? (cdr ll))
+			ll)
+		       (else
+			(cons (merge-sort-merge (car ll) (cadr ll) cmp-<=)
+			      (loop2 (cddr ll))))))))))))
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