(/show0 "parse-lambda-list.lisp 12")
-;;; Break a lambda list into its component parts. We return eleven
-;;; values:
+;;; Break something like a lambda list (but not necessarily actually a
+;;; lambda list, e.g. the representation of argument types which is
+;;; used within an FTYPE specification) into its component parts. We
+;;; return twelve values:
;;; 1. a list of the required args;
-;;; 2. a list of the optional arg specs;
-;;; 3. true if a rest arg was specified;
-;;; 4. the &rest arg;
+;;; 2. a list of the &OPTIONAL arg specs;
+;;; 3. true if a &REST arg was specified;
+;;; 4. the &REST arg;
;;; 5. true if &KEY args are present;
;;; 6. a list of the &KEY arg specs;
;;; 7. true if &ALLOW-OTHER-KEYS was specified.;
-;;; 8. a list of the &AUX specifiers;
-;;; 9. true if a &MORE arg was specified;
-;;; 10. the &MORE context var;
-;;; 11. the &MORE count var.
+;;; 8. true if any &AUX is present (new in SBCL vs. CMU CL);
+;;; 9. a list of the &AUX specifiers;
+;;; 10. true if a &MORE arg was specified;
+;;; 11. the &MORE context var;
+;;; 12. the &MORE count var;
+;;; 13. true if any lambda list keyword is present (only for
+;;; PARSE-LAMBDA-LIST-LIKE-THING).
;;;
;;; The top level lambda list syntax is checked for validity, but the
;;; arg specifiers are just passed through untouched. If something is
;;; wrong, we use COMPILER-ERROR, aborting compilation to the last
;;; recovery point.
-(declaim (ftype (function (list)
- (values list list boolean t boolean list boolean
- list boolean t t))
- parse-lambda-list))
-(defun parse-lambda-list (list)
+(declaim (ftype (sfunction (list &key (:silent boolean))
+ (values list list boolean t boolean list boolean
+ boolean list boolean t t boolean))
+ parse-lambda-list-like-thing))
+(declaim (ftype (sfunction (list &key (:silent boolean))
+ (values list list boolean t boolean list boolean
+ boolean list boolean t t))
+ parse-lambda-list))
+(defun parse-lambda-list-like-thing (list &key silent)
(collect ((required)
- (optional)
- (keys)
- (aux))
+ (optional)
+ (keys)
+ (aux))
(let ((restp nil)
- (rest nil)
- (morep nil)
- (more-context nil)
- (more-count nil)
- (keyp nil)
- (allowp nil)
- (state :required))
+ (rest nil)
+ (morep nil)
+ (more-context nil)
+ (more-count nil)
+ (keyp nil)
+ (auxp nil)
+ (allowp nil)
+ (state :required))
(declare (type (member :allow-other-keys :aux
- :key
- :more-context :more-count
- :optional
- :post-more :post-rest
- :required :rest)
- state))
+ :key
+ :more-context :more-count
+ :optional
+ :post-more :post-rest
+ :required :rest)
+ state))
(dolist (arg list)
- (if (and (symbolp arg)
- (let ((name (symbol-name arg)))
- (and (plusp (length name))
- (char= (char name 0) #\&))))
- (case arg
- (&optional
- (unless (eq state :required)
- (compiler-error "misplaced &OPTIONAL in lambda list: ~S"
- list))
- (setq state :optional))
- (&rest
- (unless (member state '(:required :optional))
- (compiler-error "misplaced &REST in lambda list: ~S" list))
- (setq state :rest))
- (&more
- (unless (member state '(:required :optional))
- (compiler-error "misplaced &MORE in lambda list: ~S" list))
- (setq morep t
- state :more-context))
- (&key
- (unless (member state
- '(:required :optional :post-rest :post-more))
- (compiler-error "misplaced &KEY in lambda list: ~S" list))
- (setq keyp t
- state :key))
- (&allow-other-keys
- (unless (eq state ':key)
- (compiler-error "misplaced &ALLOW-OTHER-KEYS in ~
+ (if (member arg sb!xc:lambda-list-keywords)
+ (case arg
+ (&optional
+ (unless (eq state :required)
+ (compiler-error "misplaced &OPTIONAL in lambda list: ~S"
+ list))
+ (setq state :optional))
+ (&rest
+ (unless (member state '(:required :optional))
+ (compiler-error "misplaced &REST in lambda list: ~S" list))
+ (setq state :rest))
+ (&more
+ (unless (member state '(:required :optional))
+ (compiler-error "misplaced &MORE in lambda list: ~S" list))
+ (setq morep t
+ state :more-context))
+ (&key
+ (unless (member state
+ '(:required :optional :post-rest :post-more))
+ (compiler-error "misplaced &KEY in lambda list: ~S" list))
+ #-sb-xc-host
+ (when (optional)
+ (unless silent
+ (compiler-style-warn
+ "&OPTIONAL and &KEY found in the same lambda list: ~S" list)))
+ (setq keyp t
+ state :key))
+ (&allow-other-keys
+ (unless (eq state ':key)
+ (compiler-error "misplaced &ALLOW-OTHER-KEYS in ~
lambda list: ~S"
- list))
- (setq allowp t
- state :allow-other-keys))
- (&aux
- (when (member state '(:rest :more-context :more-count))
- (compiler-error "misplaced &AUX in lambda list: ~S" list))
- (setq state :aux))
- ;; FIXME: I don't think ANSI says this is an error. (It
- ;; should certainly be good for a STYLE-WARNING,
- ;; though.)
- (t
- (compiler-error "unknown &KEYWORD in lambda list: ~S" arg)))
- (case state
- (:required (required arg))
- (:optional (optional arg))
- (:rest
- (setq restp t
- rest arg
- state :post-rest))
- (:more-context
- (setq more-context arg
- state :more-count))
- (:more-count
- (setq more-count arg
- state :post-more))
- (:key (keys arg))
- (:aux (aux arg))
- (t
- (compiler-error "found garbage in lambda list when expecting ~
- a keyword: ~S"
- arg)))))
+ list))
+ (setq allowp t
+ state :allow-other-keys))
+ (&aux
+ (when (member state '(:rest :more-context :more-count))
+ (compiler-error "misplaced &AUX in lambda list: ~S" list))
+ (when auxp
+ (compiler-error "multiple &AUX in lambda list: ~S" list))
+ (setq auxp t
+ state :aux))
+ (t
+ ;; It could be argued that &WHOLE and friends would be
+ ;; just ordinary variables in an ordinary lambda-list,
+ ;; but since (1) that seem exceedingly to have been the
+ ;; programmers intent and (2) the spec can be
+ ;; interpreted as giving as licence to signal an
+ ;; error[*] that is what we do.
+ ;;
+ ;; [* All lambda list keywords used in the
+ ;; implementation appear in LAMBDA-LIST-KEYWORDS. Each
+ ;; member of a lambda list is either a parameter
+ ;; specifier ot a lambda list keyword. Ergo, symbols
+ ;; appearing in LAMBDA-LIST-KEYWORDS cannot be
+ ;; parameter specifiers.]
+ (compiler-error 'simple-program-error
+ :format-control "Bad lambda list keyword ~S in: ~S"
+ :format-arguments (list arg list))))
+ (progn
+ (when (symbolp arg)
+ (let ((name (symbol-name arg)))
+ (when (and (plusp (length name))
+ (char= (char name 0) #\&))
+ ;; Should this be COMPILER-STYLE-WARN?
+ (unless silent
+ (style-warn
+ "suspicious variable in lambda list: ~S." arg)))))
+ (case state
+ (:required (required arg))
+ (:optional (optional arg))
+ (:rest
+ (setq restp t
+ rest arg
+ state :post-rest))
+ (:more-context
+ (setq more-context arg
+ state :more-count))
+ (:more-count
+ (setq more-count arg
+ state :post-more))
+ (:key (keys arg))
+ (:aux (aux arg))
+ (t
+ (compiler-error "found garbage in lambda list when expecting ~
+ a keyword: ~S"
+ arg))))))
+ (when (eq state :rest)
+ (compiler-error "&REST without rest variable"))
- (values (required) (optional) restp rest keyp (keys) allowp (aux)
- morep more-context more-count))))
+ (values (required) (optional) restp rest keyp (keys) allowp auxp (aux)
+ morep more-context more-count
+ (neq state :required)))))
+
+;;; like PARSE-LAMBDA-LIST-LIKE-THING, except our LAMBDA-LIST argument
+;;; really *is* a lambda list, not just a "lambda-list-like thing", so
+;;; can barf on things which're illegal as arguments in lambda lists
+;;; even if they could conceivably be legal in not-quite-a-lambda-list
+;;; weirdosities
+(defun parse-lambda-list (lambda-list &key silent)
+ ;; Classify parameters without checking their validity individually.
+ (multiple-value-bind (required optional restp rest keyp keys allowp auxp aux
+ morep more-context more-count)
+ (parse-lambda-list-like-thing lambda-list :silent silent)
+
+ ;; Check validity of parameters.
+ (flet ((need-symbol (x why)
+ (unless (symbolp x)
+ (compiler-error "~A is not a symbol: ~S" why x))))
+ (dolist (i required)
+ (need-symbol i "Required argument"))
+ (dolist (i optional)
+ (typecase i
+ (symbol)
+ (cons
+ (destructuring-bind (var &optional init-form supplied-p) i
+ (declare (ignore init-form supplied-p))
+ (need-symbol var "&OPTIONAL parameter name")))
+ (t
+ (compiler-error "&OPTIONAL parameter is not a symbol or cons: ~S"
+ i))))
+ (when restp
+ (need-symbol rest "&REST argument"))
+ (when keyp
+ (dolist (i keys)
+ (typecase i
+ (symbol)
+ (cons
+ (destructuring-bind (var-or-kv &optional init-form supplied-p) i
+ (declare (ignore init-form supplied-p))
+ (if (consp var-or-kv)
+ (destructuring-bind (keyword-name var) var-or-kv
+ (declare (ignore keyword-name))
+ (need-symbol var "&KEY parameter name"))
+ (need-symbol var-or-kv "&KEY parameter name"))))
+ (t
+ (compiler-error "&KEY parameter is not a symbol or cons: ~S"
+ i))))))
+
+ ;; Voila.
+ (values required optional restp rest keyp keys allowp auxp aux
+ morep more-context more-count)))
(/show0 "parse-lambda-list.lisp end of file")
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