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|
; namespaces.lisp -- user-level namespace system for Maxima
; by Robert Dodier, copyright 2006, released under terms of GNU General Public License.
; Known warts:
; * input labels appears as ($%i1) when namespace is something other than maxima
; * true and false parse to $TRUE and $FALSE, not T and NIL, when namespace is something other than maxima
;
; Functions:
;
; * Functions to establish a namespace:
;
; in_namespace(<s>)
; -- makes the namespace named by symbol <s> the current namespace.
; If a namespace named by <s> does not exist yet, a new namespace
; is created and assigned to <s>.
;
; export(<s_1>, ..., <s_n>)
; -- marks symbols <s_1>, ..., <s_n> for export from current namespace;
; has no other effect until import is called somewhere else.
;
;
; * Functions to refer to a namespace:
;
; load_namespace(<s>)
; -- pushes the current namespace onto a stack, calls `load(<s>)',
; and then pops the stack.
;
; require (<s_1>, ..., <s_n>)
; -- for each symbol <s_k>, if <s_k> names an already-defined namespace,
; then do nothing, otherwise, call load_namespace(<s_k>)
;
; import(<ns_1>, ..., <ns_n>)
; -- imports external symbols from namespaces <ns_1>, ..., <ns_n>.
; An imported symbol hides any other symbol of the same name.
; import does not attempt to load or otherwise define any undefined
; namespace; if a namespace is not yet defined, import complains.
;
; operator |
; -- namespace resolution operator.
; `foo | bar' returns symbol bar from namespace foo .
; The left-hand side (foo in the example) is evaluated.
;
; external_symbols(<ns>)
; -- returns list of external symbols in namespace <ns>.
;
; symbols(<ns>)
; -- returns list of all symbols (excluding imported symbols)
; in namespace <ns>.
;
;
; Variables:
;
; namespaces
; -- list of user-defined namespaces.
;
; maxima
; -- default namespace. All built-in functions and variables are exported.
; All other namespaces import from this namespace.
;
;
; Example:
#|
/* In foo.mac:
* (put foo.mac in current working directory)
*/
in_namespace (foo);
export (f, g);
my_constant : 1729;
f(x) := my_constant * sin(x);
g(n) := expand ((f(a) + n!)^n);
h(z) := f(z) - g(2);
/* In Maxima session: */
load ("namespaces.lisp");
maxima;
external_symbols (maxima);
load_namespace (foo);
namespaces;
foo;
symbols (foo);
external_symbols (foo);
functions;
values;
my_constant : 1 - %pi;
foo|my_constant;
'foo|my_constant;
''%;
h(x) := (1/2) * x^2;
import (foo);
dispfun (f, g, h, foo|h);
f(%pi/4);
g(3);
h(u - v);
foo|h(u - v);
kill (foo|h);
foo|h(u - v);
h(u - v);
in_namespace (aa);
x_aa : y_aa + z_aa;
f_aa (p, q) := (q - p)/x_aa;
my_constant;
maxima|my_constant;
maxima|foo|my_constant;
/* Following should redefine kill and save only in namespace aa.
* However, because package $AA uses MAXIMA, $KILL and $SAVE resolve
* to the corresponding symbols in MAXIMA.
* I would like for $SAVE and $KILL to be interned in $AA (I think)
* but I don't know a way to make that happen, and still have symbols
* in MAXIMA accessible in $AA.
*/
kill (a) := a + 1000000;
save (a) := sin(a) + cos(a);
in_namespace (bb);
x_bb : sin(y_bb);
f_bb (r) := exp(r) - 1;
in_namespace (cc);
x_cc : maxima|foo|my_constant - maxima|my_constant;
f_cc (s, t) := x_cc * s / t;
in_namespace (maxima);
in_namespace ();
trace (aa|f_aa, aa|bb|f_bb);
aa|f_aa (xx, 17);
aa|bb|f_bb (t - u);
|#
(in-package :maxima)
(setq $file_search_maxima `((mlist) ,@(cons "./###.mac" (cdr $file_search_maxima))))
(defvar $namespaces '((mlist)))
(setq $infolists (append $infolists '($namespaces)))
;!! ;; CONSTANT DECLARATION DOESN'T PREVENT REASSIGNMENT ... SEEMS LIKE A BUG
;!! (kind '$namespaces '$constant)
(defvar $maxima (find-package :maxima))
;!! ;; CONSTANT DECLARATION DOESN'T PREVENT REASSIGNMENT ... SEEMS LIKE A BUG
;!! (kind '$maxima '$constant)
(defun $symbols (p)
(let ((symbols nil))
(do-symbols (s (package-name p))
(multiple-value-bind (s2 status) (find-symbol (symbol-name s) p)
(declare (ignore s2))
(if (or (eq status :internal) (eq status :external))
(if (not (stringp s))
(setq symbols (cons s symbols))))))
($sort (cons '(mlist) symbols))))
(defun $external_symbols (p)
(let ((symbols nil))
(do-external-symbols (s (package-name p))
(if (not (stringp s))
(setq symbols (cons s symbols))))
($sort (cons '(mlist) symbols))))
(defmspec $export (l)
`((mlist) ,@(mapcar #'export (cdr l))))
(defvar *namespace-stack* nil)
(defmspec $load_namespace (form)
(push *package* *namespace-stack*)
(meval `(($load) ,(cadr form)))
(setq *package* (pop *namespace-stack*))
t)
(defun require-1 (s)
(and
(symbolp s)
(or
(find-package (symbol-name s))
(mfuncall '$load_namespace s))))
(defmspec $require (e)
`((mlist) ,@(mapcar #'require-1 (cdr e))))
(defun import-maxima-namespace (namespace-package)
(when namespace-package
(let (y)
(do-external-symbols (s namespace-package)
(shadowing-import s)
(push s y))
($sort (cons '(mlist) y)))))
(defmspec $import (expr)
`((mlist)
,@(mapcar
#'(lambda (x) (import-maxima-namespace (meval x)))
(cdr expr))))
; in_namespace(<s>)
; -- makes the namespace named by symbol <s> the current namespace
;
; If there does not already exist a namespace <s>, create a new namespace
; with that name.
;
; in_namespace() (no argument) returns the current namespace.
(defmspec $in_namespace (l)
(let ((y (cadr l)))
(cond
((null y) *package*)
((symbolp y)
(when (not (boundp y))
(let ((yy (symbol-name y)) (previous-namespace *package*))
(eval (list 'defpackage yy '(:use :maxima :common-lisp)))
(setq $namespaces (append $namespaces (list y)))
; SEEMS LIKE THERE'S A DANGER OF NAME COLLISION HERE
(intern yy previous-namespace)
(set y (find-package yy))))
(setq *package* (symbol-value y)))
(t
(if (eq (mop y) '$\|)
(progn
(meval `(($in_namespace) ,(cadr y)))
(meval `(($in_namespace) ,(meval y))))
(merror "in_namespace: argument ~S is not a | expression" y))))))
(defmspec $\| (l)
(let ((x (cadr l)) (y (caddr l)))
(if (symbolp x)
(progn
(if (and (boundp x) (not (packagep (symbol-value x))))
(merror "|: ~S is a ~S, not a namespace" x (type-of (symbol-value x))))
(if (boundp x)
(let ((xx (symbol-value x)) (yy (symbol-name y)))
(cond ((null (find-symbol yy xx)) (shadow yy xx)))
(find-symbol yy xx))
`(($\|) ,x ,y)))
`(($\|) ,(meval x) ,y))))
($infix '$\| 203 204)
(putprop '$\| '(#\|) 'dissym)
(defun parse+meval-infix (op stuff)
(let ((r (parse-infix op stuff)))
`($any . ,(meval (cdr r)))))
(putprop '$\| #'parse+meval-infix 'led)
(setf $props (delete "|" $props :count 1 :test #'equal))
;; Following bits about exporting Maxima symbols is something of a mess.
;; The :maxima package contains lots and lots of symbols, many of which
;; are relevant only to some specific block of code; those shouldn't
;; be exported. I've made an attempt to determine which symbols should be
;; exported: all dollarified functions, any dollarified symbols which
;; were declared by DEMFVAR, and any symbols which begin with the letter #\m.
;; I wouldn't be surprised if a better policy could be invented.
;; Bottom line is, I'm going to burn in Hell for this hackery ...
(defun export-maxima-keywords ()
(do-symbols (s :maxima)
(when (or (get s 'nud) (get s 'led) (get s 'mheader))
(export s))))
(defun export-maxima-dollarified-functions ()
(do-symbols (s :maxima)
(when (equal (car (exploden s)) #\$)
(if (or (fboundp s) (mfboundp s))
(export s)))))
(defun export-maxima-dollarified-variables ()
(do-symbols (s :maxima)
(when (equal (car (exploden s)) #\$)
;; DEFMVAR makes a (key, value) pair in the hash table *VARIABLE-INITIAL-VALUES*.
(multiple-value-bind (value present-p) (gethash s *variable-initial-values*)
(declare (ignore value))
(if (or present-p ($constantp s))
(export s))))))
(defun export-maxima-mfoo ()
(do-symbols (s :maxima)
(when
(and
;; Symbol name begins with #\m -- that covers MPLUS, MTIMES, and a lot of other stuff ...
(equal (car (exploden s)) #\m)
;; ... but exclude anything also present in :common-lisp, to avoid name collision.
(not (find-symbol (symbol-name s) :common-lisp)))
(export s))))
(defun export-maxima-all ()
(do-symbols (s :maxima)
(export s)))
(export-maxima-keywords)
(export-maxima-dollarified-functions)
(export-maxima-dollarified-variables)
(export-maxima-mfoo)
; (export-maxima-all)
;; DEFMVAR isn't really appropriate for these ...
;; Maybe figure out how to cover these in general export above.
(export '$namespaces)
(export '$maxima)
(export '$%%)
(export '$__)
(mapcar #'export (cdr $infolists))
(export '$infolists)
(export '$true)
(export '$false)
(export '$in)
(export '$equal)
(export '$notequal)
(export '$done)
(export '$unknown)
(export '$block)
; ------------------ begin modified existing Maxima functions ------------------
;; Intern symbols in the current package.
;; I think the right policy is this:
;; if the current package :uses :maxima, then intern in current package;
;; otherwise intern in :maxima.
;; I don't know how to detect :uses :maxima, maybe that is easy.
(defun intern-invert-case (string)
(intern (maybe-invert-string-case string)))
(defun stripdollar-string (x)
(if (and (stringp x) (equal (car (exploden x)) #\$))
(subseq x 1)
x))
(defmfun dimension-atom (form result)
(cond ((and (symbolp form) (get form atom-context))
(funcall (get form atom-context) form result))
((stringp form) (dimension-string (makestring form) result))
((ml-typep form 'array)
(dimension-array-object form result))
((and (symbolp form) (symbol-package form) (not (equal (symbol-package form) *package*))) ; NEW
;; !! THE FOLLOWING DOES NOT DISPLAY NESTED PACKAGES CORRECTLY (ONLY THE INNERMOST IS DISPLAYED)
(dimension-infix ; NEW
`(($\|) ; NEW
,#-gcl (make-symbol (package-name (symbol-package form))) ; NEW
#+gcl (make-symbol (let ((x (package-name (symbol-package form)))) (if (stringp x) x "(none)"))) ; NEW
,(make-symbol (symbol-name form))) ; NEW
result)) ; NEW
(t (dimension-string (makestring form) result))))
(defmfun makestring (atom)
(let (dummy)
(cond ((numberp atom) (exploden atom))
((stringp atom)
(setq dummy (coerce atom 'list))
(if $stringdisp
(cons #\" (nconc dummy (list #\")))
dummy))
((not (symbolp atom)) (exploden atom))
((and (setq dummy (get atom 'reversealias))
(not (and (member atom $aliases :test #'eq) (get atom 'noun))))
(exploden (stripdollar dummy)))
((equal (symbol-name atom) "") '()) ; NEW
((not (eq (getop atom) atom))
(makestring (getop atom)))
(t (setq dummy (exploden atom))
(cond
((null dummy) nil)
((char= #\$ (car dummy)) (cdr dummy))
((char= #\% (car dummy)) (cdr dummy))
($lispdisp (cons #\? dummy))
(t dummy))))))
(defmfun remvalue (x fn)
(declare (special dcount)) ; NEW
(cond ((not (symbolp x)) (improper-arg-err x fn))
((boundp x)
(let (y)
(cond ((or (setq y (member x (cdr $values) :test #'equal))
(member x (cdr $labels) :test #'equal))
(cond (y (setf $values (delete x $values :count 1 :test #'eq)))
(t (setf $labels (delete x $labels :count 1 :test #'eq))
(remprop x 'time) (remprop x 'nodisp)
(if (not (zerop dcount))
(setq dcount (1- dcount)))))
(makunbound x)
(when (member x *builtin-symbols-with-values* :test #'equal)
(setf (symbol-value x)
(gethash x *builtin-symbol-values*)))
t)
((get x 'special)
(makunbound x)
(when (member x *builtin-symbols-with-values* :test #'equal)
(setf (symbol-value x)
(gethash x *builtin-symbol-values*)))
t)
(transp (setf (symbol-value x) x) t)
((eq x '$default_let_rule_package) t)
((member x (cdr $namespaces) :test #'eq) ; NEW
(setf $namespaces (delete x $namespaces :count 1 :test #'eq)) ; NEW
(delete-package x) ; NEW
(makunbound x)) ; NEW
(t
(mtell "Warning: Illegal `remvalue' attempt:~%~M" x) nil))))))
(defmfun kill1 (x)
(declare (special allbutl dcount greatorder lessorder)) ; NEW
(if (and (stringp x) (not (getopr0 x))) (return-from kill1 nil))
(funcall
#'(lambda (z)
(cond ((and allbutl (member x allbutl :test #'equal)))
((eq (setq x (getopr x)) '$labels)
(dolist (u (cdr $labels))
(cond ((and allbutl (member u allbutl :test #'equal))
(setq z (nconc z (ncons u))))
(t (makunbound u) (remprop u 'time)
(remprop u 'nodisp))))
(setq $labels (cons '(mlist simp) z) $linenum 0 dcount 0))
((member x '($values $arrays $aliases $rules $props
$let_rule_packages) :test #'equal)
(mapc #'kill1 (cdr (symbol-value x))))
((member x '($functions $macros $gradefs $dependencies $structures) :test #'equal)
(mapc #'(lambda (y) (kill1 (caar y))) (cdr (symbol-value x))))
((eq x '$myoptions))
((eq x '$tellrats) (setq tellratlist nil))
((eq x '$ratweights) (setq *ratweights nil
$ratweights '((mlist simp))))
((eq x '$features)
(cond ((not (equal (cdr $features) featurel))
(setq $features (cons '(mlist simp) (copy-list featurel))))))
((eq x '$namespaces) ; NEW
(mapc #'kill1 (cdr (symbol-value x)))) ; NEW
((or (eq x t) (eq x '$all))
(mapc #'kill1 (cdr $infolists))
(setq $ratvars '((mlist simp)) varlist nil genvar nil
checkfactors nil greatorder nil lessorder nil $gensumnum 0
$weightlevels '((mlist)) *ratweights nil $ratweights
'((mlist simp))
tellratlist nil $dontfactor '((mlist)) $setcheck nil)
(killallcontexts))
((setq z (assoc x '(($inlabels . $inchar) ($outlabels . $outchar) ($linelabels . $linechar)) :test #'eq))
(mapc #'(lambda (y) (remvalue y '$kill))
(getlabels* (eval (cdr z)) nil)))
((and (eq (ml-typep x) 'fixnum) (not (< x 0))) (remlabels x))
((atom x) (kill1-atom x))
((and (eq (caar x) 'mlist) (eq (ml-typep (cadr x)) 'fixnum)
(or (and (null (cddr x))
(setq x (append x (ncons (cadr x)))))
(and (eq (ml-typep (caddr x)) 'fixnum)
(not (> (cadr x) (caddr x))))))
(let (($linenum (caddr x))) (remlabels (- (caddr x) (cadr x)))))
((setq z (mgetl (caar x) '(hashar array))) (remarrelem z x))
((eq (caar x) '$@) (mrecord-kill x))
((and (eq (caar x) '$allbut)
(not (dolist (u (cdr x))
(if (not (symbolp u)) (return t)))))
(let ((allbutl (cdr x))) (declare (special allbutl)) (kill1 t))) ; MODIFIED
(t (improper-arg-err x '$kill))))
nil))
(defun msize-atom (x l r)
(prog (y)
(cond ((numberp x) (setq y (exploden x)))
((and ; NEW
(symbolp x) ; NEW
(symbol-package x) ; NEW
(not (equal (symbol-package x) *package*))) ; NEW
(return ; NEW
;; !! THE FOLLOWING DOES NOT DISPLAY NESTED PACKAGES CORRECTLY (ONLY THE INNERMOST IS DISPLAYED)
(msize ; NEW
`(($\|) ; NEW
,#-gcl (make-symbol (package-name (symbol-package x))) ; NEW
#+gcl (make-symbol (let ((x (package-name (symbol-package x)))) (if (stringp x) x "(none)"))) ; NEW
,(make-symbol (symbol-name x))) ; NEW
l r lop rop))) ; NEW
((and (setq y (safe-get x 'reversealias))
(not (and (member x $aliases :test #'eq) (get x 'noun))))
(setq y (exploden (stripdollar y))))
((setq y (rassoc x aliaslist :test #'eq)) (return (msize (car y) l r lop rop)))
((null (setq y (exploden x))))
((safe-get x 'noun) (return (msize-atom (get x 'noun) l r)))
((char= #\$ (car y)) (setq y (slash (cdr y))))
((stringp x)
(setq y (coerce x 'list))
(do ((l y (cdr l))) ((null l))
(cond ((or (member (car l) '(#\" #\\ #\; #\$) :test #'equal)
(and (char< (car l) #\space)
(not (char= (car l) #\return))))
(rplacd l (cons (car l) (cdr l)))
(rplaca l #\\) (setq l (cdr l)))))
(setq y (cons #\" (nconc y (list #\")))))
(t (setq y (cons #\? (slash y)))))
(return (msz y l r))))
|
