RIGHTDIGIT ; saw "[sign] {digit}* dot {digit}+"
(ouch-read-buffer char)
(setq char (read-char stream nil nil))
- (unless char (return (make-float)))
+ (unless char (return (make-float stream)))
(case (char-class char attribute-table)
(#.+char-attr-constituent-digit+ (go RIGHTDIGIT))
(#.+char-attr-constituent-expt+ (go EXPONENT))
(#.+char-attr-delimiter+
(unread-char char stream)
- (return (make-float)))
+ (return (make-float stream)))
(#.+char-attr-escape+ (go ESCAPE))
(#.+char-attr-multiple-escape+ (go MULT-ESCAPE))
(#.+char-attr-package-delimiter+ (go COLON))
EXPTDIGIT ; got to EXPONENT, saw "[sign] {digit}+"
(ouch-read-buffer char)
(setq char (read-char stream nil nil))
- (unless char (return (make-float)))
+ (unless char (return (make-float stream)))
(case (char-class char attribute-table)
(#.+char-attr-constituent-digit+ (go EXPTDIGIT))
(#.+char-attr-delimiter+
(unread-char char stream)
- (return (make-float)))
+ (return (make-float stream)))
(#.+char-attr-escape+ (go ESCAPE))
(#.+char-attr-multiple-escape+ (go MULT-ESCAPE))
(#.+char-attr-package-delimiter+ (go COLON))
RATIODIGIT ; saw "[sign] {digit}+ slash {digit}+"
(ouch-read-buffer char)
(setq char (read-char stream nil nil))
- (unless char (return (make-ratio)))
+ (unless char (return (make-ratio stream)))
(case (char-class2 char attribute-table)
(#.+char-attr-constituent-digit+ (go RATIODIGIT))
(#.+char-attr-delimiter+
(unread-char char stream)
- (return (make-ratio)))
+ (return (make-ratio stream)))
(#.+char-attr-escape+ (go ESCAPE))
(#.+char-attr-multiple-escape+ (go MULT-ESCAPE))
(#.+char-attr-package-delimiter+ (go COLON))
(the index (* num base))))))))
(setq number (+ num (* number base-power)))))))
-(defun make-float ()
+(defun make-float (stream)
;; Assume that the contents of *read-buffer* are a legal float, with nothing
;; else after it.
(read-unwind-read-buffer)
(cond ((eofp char)
;; If not, we've read the whole number.
(let ((num (make-float-aux number divisor
- *read-default-float-format*)))
+ *read-default-float-format*
+ stream)))
(return-from make-float (if negative-fraction (- num) num))))
((exponent-letterp char)
(setq float-char char)
(#\D 'double-float)
(#\L 'long-float)))
num)
- ;; toy@rtp.ericsson.se: We need to watch out if the
+ ;; Raymond Toy writes: We need to watch out if the
;; exponent is too small or too large. We add enough to
;; EXPONENT to make it within range and scale NUMBER
;; appropriately. This should avoid any unnecessary
0))))
(incf exponent correction)
(setf number (/ number (expt 10 correction)))
- (setq num (make-float-aux number divisor float-format))
+ (setq num (make-float-aux number divisor float-format stream))
(setq num (* num (expt 10 exponent)))
(return-from make-float (if negative-fraction
(- num)
;; should never happen
(t (bug "bad fallthrough in floating point reader")))))
-(defun make-float-aux (number divisor float-format)
- (coerce (/ number divisor) float-format))
+(defun make-float-aux (number divisor float-format stream)
+ (handler-case
+ (coerce (/ number divisor) float-format)
+ (type-error (c)
+ (error 'reader-impossible-number-error
+ :error c :stream stream
+ :format-control "failed to build float"))))
-(defun make-ratio ()
+(defun make-ratio (stream)
;; Assume *READ-BUFFER* contains a legal ratio. Build the number from
;; the string.
;;
(dig ()))
((or (eofp ch) (not (setq dig (digit-char-p ch *read-base*)))))
(setq denominator (+ (* denominator *read-base*) dig)))
- (let ((num (/ numerator denominator)))
+ (let ((num (handler-case
+ (/ numerator denominator)
+ (arithmetic-error (c)
+ (error 'reader-impossible-number-error
+ :error c :stream stream
+ :format-control "failed to build ratio")))))
(if negative-number (- num) num))))
\f
;;;; cruft for dispatch macros
(default to the beginning and end of the string) It skips over
whitespace characters and then tries to parse an integer. The
radix parameter must be between 2 and 36."
- (with-array-data ((string string)
- (start start)
- (end (or end (length string))))
- (let ((index (do ((i start (1+ i)))
- ((= i end)
- (if junk-allowed
- (return-from parse-integer (values nil end))
- (error "no non-whitespace characters in number")))
- (declare (fixnum i))
- (unless (whitespacep (char string i)) (return i))))
- (minusp nil)
- (found-digit nil)
- (result 0))
- (declare (fixnum index))
- (let ((char (char string index)))
- (cond ((char= char #\-)
- (setq minusp t)
- (incf index))
- ((char= char #\+)
- (incf index))))
- (loop
- (when (= index end) (return nil))
- (let* ((char (char string index))
- (weight (digit-char-p char radix)))
- (cond (weight
- (setq result (+ weight (* result radix))
- found-digit t))
- (junk-allowed (return nil))
- ((whitespacep char)
- (do ((jndex (1+ index) (1+ jndex)))
- ((= jndex end))
- (declare (fixnum jndex))
- (unless (whitespacep (char string jndex))
- (error "junk in string ~S" string)))
- (return nil))
- (t
- (error "junk in string ~S" string))))
- (incf index))
- (values
- (if found-digit
- (if minusp (- result) result)
- (if junk-allowed
- nil
- (error "no digits in string ~S" string)))
- index))))
+ (macrolet ((parse-error (format-control)
+ `(error 'simple-parse-error
+ :format-control ,format-control
+ :format-arguments (list string))))
+ (with-array-data ((string string)
+ (start start)
+ (end (or end (length string))))
+ (let ((index (do ((i start (1+ i)))
+ ((= i end)
+ (if junk-allowed
+ (return-from parse-integer (values nil end))
+ (parse-error "no non-whitespace characters in string ~S.")))
+ (declare (fixnum i))
+ (unless (whitespacep (char string i)) (return i))))
+ (minusp nil)
+ (found-digit nil)
+ (result 0))
+ (declare (fixnum index))
+ (let ((char (char string index)))
+ (cond ((char= char #\-)
+ (setq minusp t)
+ (incf index))
+ ((char= char #\+)
+ (incf index))))
+ (loop
+ (when (= index end) (return nil))
+ (let* ((char (char string index))
+ (weight (digit-char-p char radix)))
+ (cond (weight
+ (setq result (+ weight (* result radix))
+ found-digit t))
+ (junk-allowed (return nil))
+ ((whitespacep char)
+ (do ((jndex (1+ index) (1+ jndex)))
+ ((= jndex end))
+ (declare (fixnum jndex))
+ (unless (whitespacep (char string jndex))
+ (parse-error "junk in string ~S")))
+ (return nil))
+ (t
+ (parse-error "junk in string ~S"))))
+ (incf index))
+ (values
+ (if found-digit
+ (if minusp (- result) result)
+ (if junk-allowed
+ nil
+ (parse-error "no digits in string ~S")))
+ index)))))
\f
;;;; reader initialization code
projects / sbcl.git / blobdiff