X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Freader.lisp;h=8f885fa97279d74e279b25087a6cf9314b0b0ed9;hb=0f3a5f2e8886d18d0b4f6485c38a42be629422ae;hp=4fd79a79197a187091c5d6204e3404fc95ae6a75;hpb=8618d65c14901d6a5ef804355658f8b1d25fc2c5;p=sbcl.git diff --git a/src/code/reader.lisp b/src/code/reader.lisp index 4fd79a7..8f885fa 100644 --- a/src/code/reader.lisp +++ b/src/code/reader.lisp @@ -250,17 +250,19 @@ standard Lisp readtable when NIL." :test #'char= :key #'car))) (set-cat-entry to-char att to-readtable) (set-cmt-entry to-char mac to-readtable) - (when from-dpair - (cond - (to-dpair - (let ((table (cdr to-dpair))) - (clrhash table) - (shallow-replace/eql-hash-table table (cdr from-dpair)))) - (t - (let ((pair (cons to-char (make-hash-table)))) - (shallow-replace/eql-hash-table (cdr pair) (cdr from-dpair)) + (cond ((and (not from-dpair) (not to-dpair))) + ((and (not from-dpair) to-dpair) (setf (dispatch-tables to-readtable) - (push pair (dispatch-tables to-readtable))))))))) + (remove to-dpair (dispatch-tables to-readtable)))) + (to-dpair + (let ((table (cdr to-dpair))) + (clrhash table) + (shallow-replace/eql-hash-table table (cdr from-dpair)))) + (t + (let ((pair (cons to-char (make-hash-table)))) + (shallow-replace/eql-hash-table (cdr pair) (cdr from-dpair)) + (setf (dispatch-tables to-readtable) + (push pair (dispatch-tables to-readtable)))))))) t) (defun set-macro-character (char function &optional @@ -902,9 +904,12 @@ standard Lisp readtable when NIL." (cond (all-lower (raise-em)) (all-upper (lower-em)))))))))))) +(defvar *reader-package* nil) + (defun read-token (stream firstchar) #!+sb-doc - "This function is just an fsm that recognizes numbers and symbols." + "Default readmacro function. Handles numbers, symbols, and SBCL's +extended :: syntax." ;; Check explicitly whether FIRSTCHAR has an entry for ;; NON-TERMINATING in CHARACTER-ATTRIBUTE-TABLE and ;; READ-DOT-NUMBER-SYMBOL in CMT. Report an error if these are @@ -1258,9 +1263,12 @@ standard Lisp readtable when NIL." (case (char-class char attribute-array attribute-hash-table) (#.+char-attr-delimiter+ (unread-char char stream) - (simple-reader-error stream - "illegal terminating character after a colon: ~S" - char)) + (if package-designator + (let* ((*reader-package* (%find-package-or-lose package-designator))) + (return (read stream t nil t))) + (simple-reader-error stream + "illegal terminating character after a double-colon: ~S" + char))) (#.+char-attr-single-escape+ (go SINGLE-ESCAPE)) (#.+char-attr-multiple-escape+ (go MULT-ESCAPE)) (#.+char-attr-package-delimiter+ @@ -1271,13 +1279,13 @@ standard Lisp readtable when NIL." RETURN-SYMBOL (casify-read-buffer escapes) (let ((found (if package-designator - (find-package package-designator) - (sane-package)))) - (unless found - (error 'simple-reader-package-error :stream stream - :format-arguments (list package-designator) - :format-control "package ~S not found")) - + (or (find-package package-designator) + (error 'simple-reader-package-error + :package package-designator + :stream stream + :format-control "Package ~A does not exist." + :format-arguments (list package-designator))) + (or *reader-package* (sane-package))))) (if (or (zerop colons) (= colons 2) (eq found *keyword-package*)) (return (intern* *read-buffer* *ouch-ptr* found)) (multiple-value-bind (symbol test) @@ -1285,7 +1293,9 @@ standard Lisp readtable when NIL." (when (eq test :external) (return symbol)) (let ((name (read-buffer-to-string))) (with-simple-restart (continue "Use symbol anyway.") - (error 'simple-reader-package-error :stream stream + (error 'simple-reader-package-error + :package found + :stream stream :format-arguments (list name (package-name found)) :format-control (if test @@ -1399,6 +1409,24 @@ standard Lisp readtable when NIL." (the index (* num base)))))))) (setq number (+ num (* number base-power))))))) +(defun truncate-exponent (exponent number divisor) + "Truncate exponent if it's too large for a float" + ;; Work with base-2 logarithms to avoid conversions to floats, + ;; and convert to base-10 conservatively at the end. + ;; Use the least positive float, because denormalized exponent + ;; can be larger than normalized. + (let* ((max-exponent + #!-long-float + (+ sb!vm:double-float-digits sb!vm:double-float-bias)) + (number-magnitude (integer-length number)) + (divisor-magnitude (1- (integer-length divisor))) + (magnitude (- number-magnitude divisor-magnitude))) + (if (minusp exponent) + (max exponent (ceiling (- (+ max-exponent magnitude)) + #.(floor (log 10 2)))) + (min exponent (floor (- max-exponent magnitude) + #.(floor (log 10 2))))))) + (defun make-float (stream) ;; Assume that the contents of *read-buffer* are a legal float, with nothing ;; else after it. @@ -1459,6 +1487,7 @@ standard Lisp readtable when NIL." (#\F 'single-float) (#\D 'double-float) (#\L 'long-float))) + (exponent (truncate-exponent exponent number divisor)) (result (make-float-aux (* (expt 10 exponent) number) divisor float-format stream))) (return-from make-float @@ -1471,7 +1500,8 @@ standard Lisp readtable when NIL." (type-error (c) (error 'reader-impossible-number-error :error c :stream stream - :format-control "failed to build float")))) + :format-control "failed to build float from ~a" + :format-arguments (list (read-buffer-to-string)))))) (defun make-ratio (stream) ;; Assume *READ-BUFFER* contains a legal ratio. Build the number from