X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fdefboot.lisp;h=33b265018b33443035d8a37aead29d3faa7729d6;hb=cee8ef591040db9a79cdd19297867672a9529051;hp=9f3bf28a7a478eaef9f64f29220029a4035c0874;hpb=d8c48b14b87d355b1e02f814d9bb8236847bc4de;p=sbcl.git diff --git a/src/code/defboot.lisp b/src/code/defboot.lisp index 9f3bf28..33b2650 100644 --- a/src/code/defboot.lisp +++ b/src/code/defboot.lisp @@ -426,25 +426,26 @@ evaluated as a PROGN." (defmacro-mundanely restart-bind (bindings &body forms) #!+sb-doc - "Executes forms in a dynamic context where the given restart bindings are - in effect. Users probably want to use RESTART-CASE. When clauses contain - the same restart name, FIND-RESTART will find the first such clause." - `(let ((*restart-clusters* - (cons (list - ,@(mapcar (lambda (binding) - (unless (or (car binding) - (member :report-function - binding - :test #'eq)) - (warn "Unnamed restart does not have a ~ - report function: ~S" - binding)) - `(make-restart :name ',(car binding) - :function ,(cadr binding) - ,@(cddr binding))) - bindings)) - *restart-clusters*))) - ,@forms)) + "(RESTART-BIND ({(case-name function {keyword value}*)}*) forms) + Executes forms in a dynamic context where the given bindings are in + effect. Users probably want to use RESTART-CASE. A case-name of NIL + indicates an anonymous restart. When bindings contain the same + restart name, FIND-RESTART will find the first such binding." + (flet ((parse-binding (binding) + (unless (>= (length binding) 2) + (error "ill-formed restart binding: ~S" binding)) + (destructuring-bind (name function + &rest args + &key report-function &allow-other-keys) + binding + (unless (or name report-function) + (warn "Unnamed restart does not have a report function: ~ + ~S" binding)) + `(make-restart :name ',name :function ,function ,@args)))) + `(let ((*restart-clusters* + (cons (list ,@(mapcar #'parse-binding bindings)) + *restart-clusters*))) + ,@forms))) ;;; Wrap the RESTART-CASE expression in a WITH-CONDITION-RESTARTS if ;;; appropriate. Gross, but it's what the book seems to say... @@ -471,107 +472,82 @@ evaluated as a PROGN." expression)) expression))) -;;; FIXME: I did a fair amount of rearrangement of this code in order to -;;; get WITH-KEYWORD-PAIRS to work cleanly. This code should be tested.. (defmacro-mundanely restart-case (expression &body clauses &environment env) #!+sb-doc - "(RESTART-CASE form - {(case-name arg-list {keyword value}* body)}*) - The form is evaluated in a dynamic context where the clauses have special - meanings as points to which control may be transferred (see INVOKE-RESTART). - When clauses contain the same case-name, FIND-RESTART will find the first - such clause. If Expression is a call to SIGNAL, ERROR, CERROR or WARN (or - macroexpands into such) then the signalled condition will be associated with - the new restarts." - (flet ((transform-keywords (&key report interactive test) - (let ((result '())) - (when report - (setq result (list* (if (stringp report) + "(RESTART-CASE form {(case-name arg-list {keyword value}* body)}*) + The form is evaluated in a dynamic context where the clauses have + special meanings as points to which control may be transferred (see + INVOKE-RESTART). When clauses contain the same case-name, + FIND-RESTART will find the first such clause. If form is a call to + SIGNAL, ERROR, CERROR or WARN (or macroexpands into such) then the + signalled condition will be associated with the new restarts." + ;; PARSE-CLAUSE (which uses PARSE-KEYWORDS-AND-BODY) is used to + ;; parse all clauses into lists of the form + ;; + ;; (NAME TAG KEYWORDS LAMBDA-LIST BODY) + ;; + ;; where KEYWORDS are suitable keywords for use in HANDLER-BIND + ;; bindings. These lists are then passed to + ;; * MAKE-BINDING which generates bindings for the respective NAME + ;; for HANDLER-BIND + ;; * MAKE-APPLY-AND-RETURN which generates TAGBODY entries executing + ;; the respective BODY. + (let ((block-tag (sb!xc:gensym "BLOCK")) + (temp-var (gensym))) + (labels ((parse-keywords-and-body (keywords-and-body) + (do ((form keywords-and-body (cddr form)) + (result '())) (nil) + (destructuring-bind (&optional key (arg nil argp) &rest rest) + form + (declare (ignore rest)) + (setq result + (append + (cond + ((and (eq key :report) argp) + (list :report-function + (if (stringp arg) `#'(lambda (stream) - (write-string ,report stream)) - `#',report) - :report-function - result))) - (when interactive - (setq result (list* `#',interactive - :interactive-function - result))) - (when test - (setq result (list* `#',test :test-function result))) - (nreverse result))) - (parse-keyword-pairs (list keys) - (do ((l list (cddr l)) - (k '() (list* (cadr l) (car l) k))) - ((or (null l) (not (member (car l) keys))) - (values (nreverse k) l))))) - (let ((block-tag (sb!xc:gensym "BLOCK")) - (temp-var (gensym)) - (data - (macrolet (;; KLUDGE: This started as an old DEFMACRO - ;; WITH-KEYWORD-PAIRS general utility, which was used - ;; only in this one place in the code. It was translated - ;; literally into this MACROLET in order to avoid some - ;; cross-compilation bootstrap problems. It would almost - ;; certainly be clearer, and it would certainly be more - ;; concise, to do a more idiomatic translation, merging - ;; this with the TRANSFORM-KEYWORDS logic above. - ;; -- WHN 19990925 - (with-keyword-pairs ((names expression) &body forms) - (let ((temp (member '&rest names))) - (unless (= (length temp) 2) - (error "&REST keyword is ~:[missing~;misplaced~]." - temp)) - (let* ((key-vars (ldiff names temp)) - (keywords (mapcar #'keywordicate key-vars)) - (key-var (gensym)) - (rest-var (cadr temp))) - `(multiple-value-bind (,key-var ,rest-var) - (parse-keyword-pairs ,expression ',keywords) - (let ,(mapcar (lambda (var keyword) - `(,var (getf ,key-var - ,keyword))) - key-vars keywords) - ,@forms)))))) - (mapcar (lambda (clause) - (unless (listp (second clause)) - (error "Malformed ~S clause, no lambda-list:~% ~S" - 'restart-case clause)) - (with-keyword-pairs ((report interactive test - &rest forms) - (cddr clause)) - (list (car clause) ;name=0 - (sb!xc:gensym "TAG") ;tag=1 - (transform-keywords :report report ;keywords=2 - :interactive interactive - :test test) - (cadr clause) ;bvl=3 - forms))) ;body=4 - clauses)))) - `(block ,block-tag - (let ((,temp-var nil)) - (declare (ignorable ,temp-var)) - (tagbody - (restart-bind - ,(mapcar (lambda (datum) - (let ((name (nth 0 datum)) - (tag (nth 1 datum)) - (keys (nth 2 datum))) - `(,name #'(lambda (&rest temp) - (setq ,temp-var temp) - (go ,tag)) - ,@keys))) - data) - (return-from ,block-tag - ,(munge-restart-case-expression expression env))) - ,@(mapcan (lambda (datum) - (let ((tag (nth 1 datum)) - (bvl (nth 3 datum)) - (body (nth 4 datum))) - (list tag - `(return-from ,block-tag - (apply (lambda ,bvl ,@body) - ,temp-var))))) - data))))))) + (write-string ,arg stream)) + `#',arg))) + ((and (eq key :interactive) argp) + (list :interactive-function `#',arg)) + ((and (eq key :test) argp) + (list :test-function `#',arg)) + (t + (return (values result form)))) + result))))) + (parse-clause (clause) + (unless (and (listp clause ) (>= (length clause) 2) + (listp (second clause))) + (error "ill-formed ~S clause, no lambda-list:~% ~S" + 'restart-case clause)) + (destructuring-bind (name lambda-list &body body) clause + (multiple-value-bind (keywords body) + (parse-keywords-and-body body) + (list name (sb!xc:gensym "TAG") keywords lambda-list body)))) + (make-binding (clause-data) + (destructuring-bind (name tag keywords &rest rest) clause-data + (declare (ignore rest)) + `(,name #'(lambda (&rest temp) + (setq ,temp-var temp) + (locally (declare (optimize (safety 0))) + (go ,tag))) + ,@keywords))) + (make-apply-and-return (clause-data) + (destructuring-bind (name tag keywords lambda-list body) clause-data + (declare (ignore name keywords)) + `(,tag (return-from ,block-tag + (apply (lambda ,lambda-list ,@body) ,temp-var)))))) + (let ((clauses-data (mapcar #'parse-clause clauses))) + `(block ,block-tag + (let ((,temp-var nil)) + (declare (ignorable ,temp-var)) + (tagbody + (restart-bind + ,(mapcar #'make-binding clauses-data) + (return-from ,block-tag + ,(munge-restart-case-expression expression env))) + ,@(mapcan #'make-apply-and-return clauses-data)))))))) (defmacro-mundanely with-simple-restart ((restart-name format-string &rest format-arguments)