(char-code char))
newvalue))
-;;; FIXME: could be SB!XC:DEFMACRO inside EVAL-WHEN (COMPILE EVAL)
-(defmacro get-cmt-entry (char rt)
- `(the function
- (elt (the simple-vector (character-macro-table ,rt))
- (char-code ,char))))
-
-(defun set-cmt-entry (char newvalue &optional (rt *readtable*))
- (setf (elt (the simple-vector (character-macro-table rt))
- (char-code char))
- (coerce newvalue 'function)))
+;;; the value actually stored in the character macro table. As per
+;;; ANSI #'GET-MACRO-CHARACTER and #'SET-MACRO-CHARACTER, this can
+;;; be either a function or NIL.
+(eval-when (:compile-toplevel :execute)
+ (sb!xc:defmacro get-raw-cmt-entry (char readtable)
+ `(svref (character-macro-table ,readtable)
+ (char-code ,char))))
+
+;;; the value represented by whatever is stored in the character macro
+;;; table. As per ANSI #'GET-MACRO-CHARACTER and #'SET-MACRO-CHARACTER,
+;;; a function value represents itself, and a NIL value represents the
+;;; default behavior.
+(defun get-coerced-cmt-entry (char readtable)
+ (the function
+ (or (get-raw-cmt-entry char readtable)
+ #'read-token)))
+
+(defun set-cmt-entry (char new-value-designator &optional (rt *readtable*))
+ (setf (svref (character-macro-table rt)
+ (char-code char))
+ (and new-value-designator
+ (%coerce-callable-to-fun new-value-designator))))
(defun undefined-macro-char (stream char)
(unless *read-suppress*
(setq att (get-secondary-attribute to-char)))
(set-cat-entry to-char att to-readtable)
(set-cmt-entry to-char
- (get-cmt-entry from-char really-from-readtable)
+ (get-raw-cmt-entry from-char really-from-readtable)
to-readtable)))
t)
(defun set-macro-character (char function &optional
- (non-terminatingp nil) (rt *readtable*))
+ (non-terminatingp nil)
+ (readtable *readtable*))
#!+sb-doc
- "Causes CHAR to be a macro character which invokes FUNCTION when
- seen by the reader. The NON-TERMINATINGP flag can be used to
- make the macro character non-terminating. The optional readtable
- argument defaults to the current readtable. SET-MACRO-CHARACTER
- returns T."
- (let ((rt (or rt *standard-readtable*)))
- (if non-terminatingp
- (set-cat-entry char (get-secondary-attribute char) rt)
- (set-cat-entry char +char-attr-terminating-macro+ rt))
- (set-cmt-entry char function rt)
- t))
-
-(defun get-macro-character (char &optional (rt *readtable*))
+ "Causes CHAR to be a macro character which invokes FUNCTION when seen
+ by the reader. The NON-TERMINATINGP flag can be used to make the macro
+ character non-terminating, i.e. embeddable in a symbol name."
+ (let ((designated-readtable (or readtable *standard-readtable*)))
+ (set-cat-entry char
+ (if non-terminatingp
+ (get-secondary-attribute char)
+ +char-attr-terminating-macro+)
+ designated-readtable)
+ (set-cmt-entry char function designated-readtable)
+ t)) ; (ANSI-specified return value)
+
+(defun get-macro-character (char &optional (readtable *readtable*))
#!+sb-doc
"Return the function associated with the specified CHAR which is a macro
- character. The optional readtable argument defaults to the current
- readtable."
- (let ((rt (or rt *standard-readtable*)))
- ;; Check macro syntax, return associated function if it's there.
- ;; Returns a value for all constituents.
- (cond ((constituentp char)
- (values (get-cmt-entry char rt) t))
- ((terminating-macrop char)
- (values (get-cmt-entry char rt) nil))
- (t nil))))
+ character, or NIL if there is no such function. As a second value, return
+ T if CHAR is a macro character which is non-terminating, i.e. which can
+ be embedded in a symbol name."
+ (let* ((designated-readtable (or readtable *standard-readtable*))
+ ;; the first return value: a FUNCTION if CHAR is a macro
+ ;; character, or NIL otherwise
+ (fun-value (get-raw-cmt-entry char designated-readtable)))
+ (values fun-value
+ ;; NON-TERMINATING-P return value:
+ (if fun-value
+ (or (constituentp char)
+ (not (terminating-macrop char)))
+ ;; ANSI's definition of GET-MACRO-CHARACTER says this
+ ;; value is NIL when CHAR is not a macro character.
+ ;; I.e. this value means not just "non-terminating
+ ;; character?" but "non-terminating macro character?".
+ nil))))
\f
;;;; definitions to support internal programming conventions
-(defmacro eofp (char) `(eq ,char *eof-object*))
+(defmacro eofp (char)
+ `(eq ,char *eof-object*))
(defun flush-whitespace (stream)
;; This flushes whitespace chars, returning the last char it read (a
(defun !cold-init-standard-readtable ()
(setq *standard-readtable* (make-readtable))
- ;; All characters default to "constituent" in MAKE-READTABLE.
- ;; *** un-constituent-ize some of these ***
+ ;; All characters get boring defaults in MAKE-READTABLE. Now we
+ ;; override the boring defaults on characters which need more
+ ;; interesting behavior.
(let ((*readtable* *standard-readtable*))
- (set-cat-entry (code-char tab-char-code) +char-attr-whitespace+)
- (set-cat-entry #\linefeed +char-attr-whitespace+)
- (set-cat-entry #\space +char-attr-whitespace+)
- (set-cat-entry (code-char form-feed-char-code) +char-attr-whitespace+)
- (set-cat-entry (code-char return-char-code) +char-attr-whitespace+)
+
+ (flet ((whitespaceify (char)
+ (set-cat-entry char +char-attr-whitespace+)))
+ (whitespaceify (code-char tab-char-code))
+ (whitespaceify #\linefeed)
+ (whitespaceify #\space)
+ (whitespaceify (code-char form-feed-char-code))
+ (whitespaceify (code-char return-char-code)))
+
(set-cat-entry #\\ +char-attr-escape+)
(set-cmt-entry #\\ #'read-token)
- (set-cat-entry (code-char rubout-char-code) +char-attr-whitespace+)
- (set-cmt-entry #\: #'read-token)
- (set-cmt-entry #\| #'read-token)
- ;; macro definitions
+
+ ;; Easy macro-character definitions are in this source file.
(set-macro-character #\" #'read-string)
- ;; * # macro
(set-macro-character #\' #'read-quote)
(set-macro-character #\( #'read-list)
(set-macro-character #\) #'read-right-paren)
(set-macro-character #\; #'read-comment)
- ;; * backquote
+ ;; (The hairier macro-character definitions, for #\# and #\`, are
+ ;; defined elsewhere, in their own source files.)
+
;; all constituents
(do ((ichar 0 (1+ ichar))
(char))
(setq char (code-char ichar))
(when (constituentp char *standard-readtable*)
(set-cat-entry char (get-secondary-attribute char))
- (set-cmt-entry char #'read-token)))))
+ (set-cmt-entry char nil)))))
\f
;;;; implementation of the read buffer
(cond ((eofp char) (return eof-value))
((whitespacep char))
(t
- (let* ((macrofun (get-cmt-entry char *readtable*))
+ (let* ((macrofun (get-coerced-cmt-entry char *readtable*))
(result (multiple-value-list
(funcall macrofun stream char))))
;; Repeat if macro returned nothing.
;;; past them. We assume CHAR is not whitespace.
(defun read-maybe-nothing (stream char)
(let ((retval (multiple-value-list
- (funcall (get-cmt-entry char *readtable*) stream char))))
+ (funcall (get-coerced-cmt-entry char *readtable*)
+ stream
+ char))))
(if retval (rplacd retval nil))))
(defun read (&optional (stream *standard-input*)
projects / sbcl.git / blobdiff