[RFC 14/14] Remove pprint.scm and cos-pprint.scm

[Tom Tromey <tom@tromey.com>]

pprint.scm and cos-pprint.scm are for debugging.  They aren't used
in-tree and Guile provides a pretty-printer now.
---
 cos-pprint.scm |  26 ------
 pprint.scm     | 212 -------------------------------------------------
 2 files changed, 238 deletions(-)
 delete mode 100644 cos-pprint.scm
 delete mode 100644 pprint.scm

diff --git a/cos-pprint.scm b/cos-pprint.scm
deleted file mode 100644
index 0bf55c6..0000000
--- a/cos-pprint.scm
+++ /dev/null
@@ -1,26 +0,0 @@
-;;;; cos-pprint.scm --- pretty-print definitions for COS
-;;;; Copyright (C) 2005, 2009 Red Hat, Inc.
-;;;; This file is part of CGEN.
-;;;; See file COPYING.CGEN for details.
-
-;;; To use this with pprint.scm:
-;;;
-;;;   (load "pprint.scm")
-;;;   (load "cos-pprint.scm")
-;;;
-;;; You must load this file second, so it can redefine the ELIDE? and
-;;; ELIDED-NAME hooks.
-;;;
-;;; See the documentation in pprint.scm for details.
-
-(define (elide? obj)
-  (or (object? obj) (class? obj)))
-
-(define (elided-name obj)
-  (cond ((class? obj) `(class ,(class-name obj)))
-	((object? obj)
-	 `(object ,(class-name (object-class obj))
-		  ,@(if (method-present? obj 'get-name)
-			(list (send obj 'get-name))
-			'())))
-	(else (error "unexpected elided object"))))
diff --git a/pprint.scm b/pprint.scm
deleted file mode 100644
index 63d78bf..0000000
--- a/pprint.scm
+++ /dev/null
@@ -1,212 +0,0 @@
-;;;; pprint.scm --- pretty-printing objects for CGEN
-;;;; Copyright (C) 2005, 2009 Red Hat, Inc.
-;;;; This file is part of CGEN.
-;;;; See file COPYING.CGEN for details.
-
-;;; This file defines a printing function PPRINT, and some hooks to
-;;; let you print certain kind of objects in a summary way, and get at
-;;; their full values later.
-
-;;; PPRINT is a printer for Scheme objects that prints lists or
-;;; vectors that contain shared structure or cycles and prints them in
-;;; a finite, legible way.
-;;;
-;;; Ordinary values print in the usual way:
-;;;
-;;;   guile> (pprint '(1 #(2 3) 4))
-;;;   (1 #(2 3) 4)
-;;;
-;;; Values can share structure:
-;;; 
-;;;   guile> (let* ((c (list 1 2))
-;;;                 (d (list c c)))
-;;;            (write d)
-;;;            (newline))
-;;;   ((1 2) (1 2))
-;;;
-;;; In that list, the two instances of (1 2) are actually the same object;
-;;; the top-level list refers to the same object twice.
-;;;
-;;; Printing that structure with PPRINT shows the sharing:
-;;; 
-;;;   guile> (let* ((c (list 1 2))
-;;;                 (d (list c c)))
-;;;            (pprint d))
-;;;   (#0=(1 2) #0#)
-;;;
-;;; Here the "#0=" before the list (1 2) labels it with the number
-;;; zero.  Then, the "#0#" as the second element of the top-level list
-;;; indicates that the object appears here, too, referring to it by
-;;; its label.
-;;;
-;;; If you have several objects that appear more than once, they each
-;;; get a separate label:
-;;;
-;;;   guile> (let* ((a (list 1 2))
-;;;                 (b (list 3 4))
-;;;                 (c (list a b a b)))
-;;;            (pprint c))
-;;;   (#0=(1 2) #1=(3 4) #0# #1#)
-;;;
-;;; Cyclic values just share structure with themselves:
-;;;
-;;;   guile> (let* ((a (list 1 #f)))
-;;;            (set-cdr! a a)
-;;;            (pprint a))
-;;;   #0=(1 . #0#)
-;;;
-;;;
-;;; PPRINT also consults the function ELIDE? and ELIDED-NAME to see
-;;; whether it should print a value in a summary form.  You can
-;;; re-define those functions to customize PPRINT's behavior;
-;;; cos-pprint.scm defines them to handle COS objects and classes
-;;; nicely.
-;;;
-;;; (ELIDE? OBJ) should return true if OBJ should be elided.
-;;; (ELIDED-NAME OBJ) should return a (non-cyclic!) object to be used
-;;; as OBJ's abbreviated form.
-;;;
-;;; PPRINT prints an elided object as a list ($ N NAME), where NAME is
-;;; the value returned by ELIDED-NAME to stand for the object, and N
-;;; is a number; each elided object gets its own number.  You can refer
-;;; to the elided object number N as ($ N).
-;;;
-;;; For example, if you've loaded CGEN, pprint.scm, and cos-pprint.scm
-;;; (you must load cos-pprint.scm *after* loading pprint.scm), you can
-;;; print a list containing the <insn> and <ident> classes:
-;;;
-;;;   guile> (pprint (list <insn> <ident>))
-;;;   (($ 1 (class <insn>)) ($ 2 (class <ident>)))
-;;;   guile> (class-name ($ 1))
-;;;   <insn>
-;;;   guile> (class-name ($ 2))
-;;;   <ident>
-;;;
-;;; As a special case, PPRINT never elides the object that was passed
-;;; to it directly.  So you can look inside an elided object by doing
-;;; just that:
-;;;
-;;;   guile> (pprint ($ 2))
-;;;   #0=#("class" <ident> () ((name #:unbound #f . 0) ...
-;;;
-
-
-;;; A list of elided objects, larger numbers first, and the number of
-;;; the first element.
-(define elide-table '())
-(define elide-table-last -1)
-
-;;; Add OBJ to the elided object list, and return its number.
-(define (add-elided-object obj)
-  (set! elide-table (cons obj elide-table))
-  (set! elide-table-last (+ elide-table-last 1))
-  elide-table-last)
-
-;;; Referencing elided objects.
-(define ($ n)
-  (if (<= 0 n elide-table-last)
-      (list-ref elide-table (- elide-table-last n))
-      "no such object"))
-
-;;; A default predicate for elision.
-(define (elide? obj) #f)
-
-;;; If (elide? OBJ) is true, return some sort of abbreviated list
-;;; structure that might be helpful to the user in identifying the
-;;; elided object.
-;;; A default definition.
-(define (elided-name obj) "")
-
-;;; This is a pretty-printer that handles cyclic and shared structure.
-(define (pprint original-obj)
-
-  ;; Return true if OBJ should be elided in this call to pprint.
-  ;; (We never elide the object we were passed itself.)
-  (define (elide-this-call? obj)
-    (and (not (eq? obj original-obj))
-	 (elide? obj)))
-
-  ;; First, traverse OBJ and build a hash table mapping objects
-  ;; referenced more than once to #t, and everything else to #f.
-  ;; (Only include entries for objects that might be interior nodes:
-  ;; pairs and vectors.)
-  (let ((shared
-	 ;; Guile's stupid hash tables don't resize the table; the
-	 ;; chains just get longer and longer.  So we need a big value here.
-	 (let ((seen   (make-hash-table 65521))
-	       (shared (make-hash-table 4093)))
-	   (define (walk! obj)
-	     (if (or (pair? obj) (vector? obj))
-		 (if (hashq-ref seen obj)
-		     (hashq-set! shared obj #t)
-		     (begin
-		       (hashq-set! seen obj #t)
-		       (cond ((elide-this-call? obj))
-			     ((pair? obj) (begin (walk! (car obj))
-						 (walk! (cdr obj))))
-			     ((vector? obj) (do ((i 0 (+ i 1)))
-						 ((>= i (vector-length obj)))
-					       (walk! (vector-ref obj i))))
-			     (else (error "unhandled interior type")))))))
-	   (walk! original-obj)
-	   shared)))
-
-    ;; A counter for shared structure labels.
-    (define fresh-shared-label
-      (let ((n 0))
-	(lambda ()
-	  (let ((l n))
-	    (set! n (+ n 1))
-	    l))))
-
-    (define (print obj)
-      (print-with-label obj (hashq-ref shared obj)))
-
-    ;; Print an object OBJ, which SHARED maps to L.
-    ;; L is always (hashq-ref shared obj), but we have that value handy
-    ;; at times, so this entry point lets us avoid looking it up again.
-    (define (print-with-label obj label)
-      (if (number? label)
-	  ;; If we've already visited this object, just print a
-	  ;; reference to its label.
-	  (map display `("#" ,label "#"))
-	  (begin
-	    ;; If it needs a label, attach one now.
-	    (if (eqv? label #t) (let ((label (fresh-shared-label)))
-				  (hashq-set! shared obj label)
-				  (map display `("#" ,label "="))))
-	    ;; Print the object.
-	    (cond ((elide-this-call? obj)
-		   (write (list '$ (add-elided-object obj) (elided-name obj))))
-		  ((pair? obj) (begin (display "(")
-				      (print-tail obj)))
-		  ((vector? obj) (begin (display "#(")
-					(do ((i 0 (+ i 1)))
-					    ((>= i (vector-length obj)))
-					  (print (vector-ref obj i))
-					  (if (< (+ i 1) (vector-length obj))
-					      (display " ")))
-					(display ")")))
-		  (else (write obj))))))
-
-    ;; Print a pair P as if it were the tail of a list; assume the
-    ;; opening paren and any previous elements have been printed.
-    (define (print-tail obj)
-      (print (car obj))
-      (force-output)
-      (let ((tail (cdr obj)))
-	(if (null? tail)
-	    (display ")")
-	    ;; We use the dotted pair syntax if the cdr isn't a pair, but
-	    ;; also if it needs to be labeled.
-	    (let ((tail-label (hashq-ref shared tail)))
-	      (if (or (not (pair? tail)) tail-label)
-		  (begin (display " . ")
-			 (print-with-label tail tail-label)
-			 (display ")"))
-		  (begin (display " ")
-			 (print-tail tail)))))))
-
-    (print original-obj)
-    (newline)))
-
-- 
2.41.0