;; Copyright (C) 2012, 2013 David Vazquez
;; Copyright (C) 2012 Raimon Grau
-;; This program is free software: you can redistribute it and/or
+;; JSCL is free software: you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;;
-;; This program is distributed in the hope that it will be useful, but
+;; JSCL is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
-;; along with this program. If not, see <http://www.gnu.org/licenses/>.
+;; along with JSCL. If not, see <http://www.gnu.org/licenses/>.
+
+(/debug "loading print.lisp!")
;;; Printer
+(defun lisp-escape-string (string)
+ (let ((output "")
+ (index 0)
+ (size (length string)))
+ (while (< index size)
+ (let ((ch (char string index)))
+ (when (or (char= ch #\") (char= ch #\\))
+ (setq output (concat output "\\")))
+ (when (or (char= ch #\newline))
+ (setq output (concat output "\\"))
+ (setq ch #\n))
+ (setq output (concat output (string ch))))
+ (incf index))
+ (concat "\"" output "\"")))
+
+;;; Return T if the string S contains characters which need to be
+;;; escaped to print the symbol name, NIL otherwise.
+(defun escape-symbol-name-p (s)
+ (let ((dots-only t))
+ (dotimes (i (length s))
+ (let ((ch (char s i)))
+ (setf dots-only (and dots-only (char= ch #\.)))
+ (when (or (terminalp ch)
+ (char= ch #\:)
+ (char= ch #\\)
+ (not (char= ch (char-upcase ch)))
+ (char= ch #\|))
+ (return-from escape-symbol-name-p t))))
+ dots-only))
+
+;;; Return T if the specified string can be read as a number
+;;; In case such a string is the name of a symbol then escaping
+;;; is required when printing to ensure correct reading.
+(defun potential-number-p (string)
+ ;; The four rules for being a potential number are described in
+ ;; 2.3.1.1 Potential Numbers as Token
+ ;;
+ ;; First Rule
+ (dotimes (i (length string))
+ (let ((char (char string i)))
+ (cond
+ ;; Digits TODO: DIGIT-CHAR-P should work with the current
+ ;; radix here. If the radix is not decimal, then we have to
+ ;; make sure there is not a decimal-point in the string.
+ ((digit-char-p char))
+ ;; Signs, ratios, decimal point and extension mark
+ ((find char "+-/._^"))
+ ;; Number marker
+ ((alpha-char-p char)
+ (when (and (< i (1- (length string)))
+ (alpha-char-p (char string (1+ i))))
+ ;; fail: adjacent letters are not number marker, or
+ ;; there is a decimal point in the string.
+ (return-from potential-number-p)))
+ (t
+ ;; fail: there is a non-allowed character
+ (return-from potential-number-p)))))
+ (and
+ ;; Second Rule. In particular string is not empty.
+ (find-if #'digit-char-p string)
+ ;; Third rule
+ (let ((first (char string 0)))
+ (and (not (char= first #\:))
+ (or (digit-char-p first)
+ (find first "+-._^"))))
+ ;; Fourth rule
+ (not (find (char string (1- (length string))) "+-)"))))
+
+#+nil
+(mapcar #'potential-number-p
+ '("1b5000" "777777q" "1.7J" "-3/4+6.7J" "12/25/83" "27^19"
+ "3^4/5" "6//7" "3.1.2.6" "^-43^" "3.141_592_653_589_793_238_4"
+ "-3.7+2.6i-6.17j+19.6k"))
+
+#+nil
+(mapcar #'potential-number-p '("/" "/5" "+" "1+" "1-" "foo+" "ab.cd" "_" "^" "^/-"))
+
+(defun escape-token-p (string)
+ (or (potential-number-p string)
+ (escape-symbol-name-p string)))
+
+;;; Returns the token in a form that can be used for reading it back.
+(defun escape-token (s)
+ (if (escape-token-p s)
+ (let ((result "|"))
+ (dotimes (i (length s))
+ (let ((ch (char s i)))
+ (when (or (char= ch #\|)
+ (char= ch #\\))
+ (setf result (concat result "\\")))
+ (setf result (concat result (string ch)))))
+ (concat result "|"))
+ s))
+
(defvar *print-escape* t)
+(defvar *print-circle* nil)
-(defun write-to-string (form)
- (cond
- ((symbolp form)
- (multiple-value-bind (symbol foundp)
- (find-symbol (symbol-name form) *package*)
- (if (and foundp (eq symbol form))
- (symbol-name form)
- (let ((package (symbol-package form))
- (name (symbol-name form)))
- (concat (cond
- ((null package) "#")
- ((eq package (find-package "KEYWORD")) "")
- (t (package-name package)))
- ":" name)))))
- ((integerp form) (integer-to-string form))
- ((floatp form) (float-to-string form))
- ((stringp form) (if *print-escape*
- (concat "\"" (escape-string form) "\"")
- form))
- ((functionp form)
- (let ((name (oget form "fname")))
- (if name
- (concat "#<FUNCTION " name ">")
- (concat "#<FUNCTION>"))))
- ((listp form)
- (concat "("
- (join-trailing (mapcar #'write-to-string (butlast form)) " ")
- (let ((last (last form)))
- (if (null (cdr last))
- (write-to-string (car last))
- (concat (write-to-string (car last)) " . " (write-to-string (cdr last)))))
- ")"))
- ((arrayp form)
- (concat "#" (if (zerop (length form))
- "()"
- (write-to-string (vector-to-list form)))))
- ((packagep form)
- (concat "#<PACKAGE " (package-name form) ">"))
- (t
- (concat "#<javascript object>"))))
+;;; FIXME: Please, rewrite this in a more organized way.
+(defun write-to-string (form &optional known-objects object-ids)
+ (when (and (not known-objects) *print-circle*)
+ ;; To support *print-circle* some objects must be tracked for
+ ;; sharing: conses, arrays and apparently-uninterned symbols.
+ ;; These objects are placed in an array and a parallel array is
+ ;; used to mark if they're found multiple times by assining them
+ ;; an id starting from 1.
+ ;;
+ ;; After the tracking has been completed the printing phas can
+ ;; begin: if an object has an id > 0 then #<n>= is prefixed and
+ ;; the id is changed to negative. If an object has an id < 0 then
+ ;; #<-n># is printed instead of the object.
+ ;;
+ ;; The processing is O(n^2) with n = number of tracked
+ ;; objects. Hopefully it will become good enough when the new
+ ;; compiler is available.
+ (setf known-objects (make-array 100))
+ (setf object-ids (make-array 100))
+ (let ((n 0)
+ (sz 100)
+ (count 0))
+ (labels ((mark (x)
+ (let ((i (position x known-objects)))
+ (if (= i -1)
+ (progn
+ (when (= n sz)
+ (setf sz (* 2 sz))
+ ;; KLUDGE: storage vectors are an internal
+ ;; object which the printer should not know
+ ;; about. Use standard vector with fill
+ ;; pointers instead.
+ (resize-storage-vector known-objects sz)
+ (resize-storage-vector object-ids sz))
+ (aset known-objects (1- (incf n)) x)
+ t)
+ (unless (aref object-ids i)
+ (aset object-ids i (incf count))
+ nil))))
+ (visit (x)
+ (cond
+ ((and x (symbolp x) (null (symbol-package x)))
+ (mark x))
+ ((consp x)
+ (when (mark x)
+ (visit (car x))
+ (visit (cdr x))))
+ ((vectorp x)
+ (when (mark x)
+ (dotimes (i (length x))
+ (visit (aref x i))))))))
+ (visit form))))
+ (let ((prefix ""))
+ (when (and *print-circle*
+ (or (consp form)
+ (vectorp form)
+ (and form (symbolp form) (null (symbol-package form)))))
+ (let* ((ix (position form known-objects))
+ (id (aref object-ids ix)))
+ (cond
+ ((and id (> id 0))
+ (setf prefix (format nil "#~S=" id))
+ (aset object-ids ix (- id)))
+ ((and id (< id 0))
+ (return-from write-to-string (format nil "#~S#" (- id)))))))
+ (concat prefix
+ (cond
+ ((null form) "NIL")
+ ((symbolp form)
+ (let ((name (symbol-name form))
+ (package (symbol-package form)))
+ ;; Check if the symbol is accesible from the current package. It
+ ;; is true even if the symbol's home package is not the current
+ ;; package, because it could be inherited.
+ (if (eq form (find-symbol (symbol-name form)))
+ (escape-token (symbol-name form))
+ ;; Symbol is not accesible from *PACKAGE*, so let us prefix
+ ;; the symbol with the optional package or uninterned mark.
+ (concat (cond
+ ((null package) "#")
+ ((eq package (find-package "KEYWORD")) "")
+ (t (escape-token (package-name package))))
+ ":"
+ (if (and package
+ (eq (second (multiple-value-list
+ (find-symbol name package)))
+ :internal))
+ ":"
+ "")
+ (escape-token name)))))
+ ((integerp form) (integer-to-string form))
+ ((floatp form) (float-to-string form))
+ ((characterp form)
+ (concat "#\\"
+ (case form
+ (#\newline "newline")
+ (#\space "space")
+ (otherwise (string form)))))
+ ((stringp form) (if *print-escape*
+ (lisp-escape-string form)
+ form))
+ ((functionp form)
+ (let ((name (oget form "fname")))
+ (if name
+ (concat "#<FUNCTION " name ">")
+ (concat "#<FUNCTION>"))))
+ ((listp form)
+ (concat "("
+ (join-trailing (mapcar (lambda (x)
+ (write-to-string x known-objects object-ids))
+ (butlast form)) " ")
+ (let ((last (last form)))
+ (if (null (cdr last))
+ (write-to-string (car last) known-objects object-ids)
+ (concat (write-to-string (car last) known-objects object-ids)
+ " . "
+ (write-to-string (cdr last) known-objects object-ids))))
+ ")"))
+ ((vectorp form)
+ (let ((result "#(")
+ (sep ""))
+ (dotimes (i (length form))
+ (setf result (concat result sep
+ (write-to-string (aref form i)
+ known-objects
+ object-ids)))
+ (setf sep " "))
+ (concat result ")")))
+ ((packagep form)
+ (concat "#<PACKAGE " (package-name form) ">"))
+ (t "#<javascript object>")))))
(defun prin1-to-string (form)
(let ((*print-escape* t))
(let ((*print-escape* nil))
(write-to-string form)))
+(defun terpri ()
+ (write-char #\newline)
+ (values))
+
(defun write-line (x)
(write-string x)
- (write-string *newline*)
+ (terpri)
x)
(defun warn (string)
(defun format (destination fmt &rest args)
(let ((len (length fmt))
- (i 0)
- (res "")
- (arguments args))
+ (i 0)
+ (res "")
+ (arguments args))
(while (< i len)
(let ((c (char fmt i)))
- (if (char= c #\~)
- (let ((next (char fmt (incf i))))
- (cond
- ((char= next #\~)
- (setq res (concat res "~")))
- ((char= next #\%)
- (setq res (concat res *newline*)))
- (t
- (setq res (concat res (format-special next (car arguments))))
- (setq arguments (cdr arguments)))))
- (setq res (concat res (char-to-string c))))
- (incf i)))
+ (if (char= c #\~)
+ (let ((next (char fmt (incf i))))
+ (cond
+ ((char= next #\~)
+ (concatf res "~"))
+ ((char= next #\%)
+ (concatf res (string #\newline)))
+ ((char= next #\*)
+ (pop arguments))
+ (t
+ (concatf res (format-special next (car arguments)))
+ (pop arguments))))
+ (setq res (concat res (string c))))
+ (incf i)))
(if destination
- (progn
- (write-string res)
- nil)
- res)))
-
+ (progn
+ (write-string res)
+ nil)
+ res)))
- (defun format-special (chr arg)
- (case chr
- (#\S (prin1-to-string arg))
- (#\a (princ-to-string arg))))
+(defun format-special (chr arg)
+ (case (char-upcase chr)
+ (#\S (prin1-to-string arg))
+ (#\A (princ-to-string arg))))
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