;;;; character functions ;;;; ;;;; This implementation assumes the use of ASCII codes and the ;;;; specific character formats used in SBCL (and its ancestor, CMU ;;;; CL). It is optimized for performance rather than for portability ;;;; and elegance, and may have to be rewritten if the character ;;;; representation is changed. ;;;; ;;;; KLUDGE: As of sbcl-0.6.11.25, at least, the ASCII-dependence is ;;;; not confined to this file. E.g. there are DEFTRANSFORMs in ;;;; srctran.lisp for CHAR-UPCASE, CHAR-EQUAL, and CHAR-DOWNCASE, and ;;;; they assume ASCII. -- WHN 2001-03-25 ;;;; This software is part of the SBCL system. See the README file for ;;;; more information. ;;;; ;;;; This software is derived from the CMU CL system, which was ;;;; written at Carnegie Mellon University and released into the ;;;; public domain. The software is in the public domain and is ;;;; provided with absolutely no warranty. See the COPYING and CREDITS ;;;; files for more information. (in-package "SB!IMPL") ;;; We compile some trivial character operations via inline expansion. #!-sb-fluid (declaim (inline standard-char-p graphic-char-p alpha-char-p upper-case-p lower-case-p both-case-p alphanumericp char-int)) (declaim (maybe-inline digit-char-p digit-weight)) (deftype char-code () `(integer 0 (,char-code-limit))) (defvar *character-database*) (declaim (type (simple-array (unsigned-byte 8) (*)) *character-database*)) #!+sb-unicode (progn (defvar *unicode-character-name-database*) (defvar *unicode-character-name-huffman-tree*)) (macrolet ((frob () (flet ((file (name type) (merge-pathnames (make-pathname :directory '(:relative :up :up "output") :name name :type type) sb!xc:*compile-file-truename*))) `(progn ,(with-open-file (stream (file "ucd" "dat") :direction :input :element-type '(unsigned-byte 8)) (let* ((length (file-length stream)) (array (make-array length :element-type '(unsigned-byte 8)))) (read-sequence array stream) `(defun !character-database-cold-init () (setq *character-database* ',array)))) ,(with-open-file (stream (file "ucd-names" "lisp-expr") :direction :input :element-type 'character) (let ((names (make-hash-table))) #!+sb-unicode (loop for code-point = (read stream nil nil) for char-name = (string-upcase (read stream nil nil)) while code-point do (setf (gethash code-point names) char-name)) (let ((tree #!+sb-unicode (make-huffman-tree (let (list) (maphash (lambda (code name) (declare (ignore code)) (push name list)) names) list))) (code->name (make-array (hash-table-count names) :fill-pointer 0)) (name->code nil)) (maphash (lambda (code name) (vector-push (cons code (huffman-encode name tree)) code->name)) names) (setf name->code (sort (copy-seq code->name) #'< :key #'cdr)) (setf code->name (sort (copy-seq name->code) #'< :key #'car)) (setf names nil) `(defun !character-name-database-cold-init () #!+sb-unicode (setq *unicode-character-name-database* (cons ',code->name ',name->code) *unicode-character-name-huffman-tree* ',tree))))))))) (frob)) #+sb-xc-host (!character-database-cold-init) #+sb-xc-host (!character-name-database-cold-init) (defparameter *base-char-name-alist* ;; Note: The *** markers here indicate character names which are ;; required by the ANSI specification of #'CHAR-NAME. For the others, ;; we prefer the ASCII standard name. '((#x00 "Nul" "Null" "^@") (#x01 "Soh" "^a") (#x02 "Stx" "^b") (#x03 "Etx" "^c") (#x04 "Eot" "^d") (#x05 "Enq" "^e") (#x06 "Ack" "^f") (#x07 "Bel" "Bell" "^g") (#x08 "Backspace" "^h" "Bs") ; *** See Note above (#x09 "Tab" "^i" "Ht") ; *** See Note above (#x0A "Newline" "Linefeed" "^j" "Lf" "Nl") ; *** See Note above (#x0B "Vt" "^k") (#x0C "Page" "^l" "Form" "Formfeed" "Ff" "Np") ; *** See Note above (#x0D "Return" "^m" "Cr") ; *** See Note above (#x0E "So" "^n") (#x0F "Si" "^o") (#x10 "Dle" "^p") (#x11 "Dc1" "^q") (#x12 "Dc2" "^r") (#x13 "Dc3" "^s") (#x14 "Dc4" "^t") (#x15 "Nak" "^u") (#x16 "Syn" "^v") (#x17 "Etb" "^w") (#x18 "Can" "^x") (#x19 "Em" "^y") (#x1A "Sub" "^z") (#x1B "Esc" "Escape" "^[" "Altmode" "Alt") (#x1C "Fs" "^\\") (#x1D "Gs" "^]") (#x1E "Rs" "^^") (#x1F "Us" "^_") (#x20 "Space" "Sp") ; *** See Note above (#x7f "Rubout" "Delete" "Del") (#x80 "C80") (#x81 "C81") (#x82 "Break-Permitted") (#x83 "No-Break-Permitted") (#x84 "C84") (#x85 "Next-Line") (#x86 "Start-Selected-Area") (#x87 "End-Selected-Area") (#x88 "Character-Tabulation-Set") (#x89 "Character-Tabulation-With-Justification") (#x8A "Line-Tabulation-Set") (#x8B "Partial-Line-Forward") (#x8C "Partial-Line-Backward") (#x8D "Reverse-Linefeed") (#x8E "Single-Shift-Two") (#x8F "Single-Shift-Three") (#x90 "Device-Control-String") (#x91 "Private-Use-One") (#x92 "Private-Use-Two") (#x93 "Set-Transmit-State") (#x94 "Cancel-Character") (#x95 "Message-Waiting") (#x96 "Start-Guarded-Area") (#x97 "End-Guarded-Area") (#x98 "Start-String") (#x99 "C99") (#x9A "Single-Character-Introducer") (#x9B "Control-Sequence-Introducer") (#x9C "String-Terminator") (#x9D "Operating-System-Command") (#x9E "Privacy-Message") (#x9F "Application-Program-Command"))) ; *** See Note above ;;;; accessor functions ;; (* 8 186) => 1488 ;; (+ 1488 (ash #x110000 -8)) => 5840 (defun ucd-index (char) (let* ((cp (char-code char)) (cp-high (ash cp -8)) (page (aref *character-database* (+ 1488 cp-high)))) (+ 5840 (ash page 10) (ash (ldb (byte 8 0) cp) 2)))) (defun ucd-value-0 (char) (aref *character-database* (ucd-index char))) (defun ucd-value-1 (char) (let ((index (ucd-index char))) (dpb (aref *character-database* (+ index 3)) (byte 8 16) (dpb (aref *character-database* (+ index 2)) (byte 8 8) (aref *character-database* (1+ index)))))) (defun ucd-general-category (char) (aref *character-database* (* 8 (ucd-value-0 char)))) (defun ucd-decimal-digit (char) (let ((decimal-digit (aref *character-database* (+ 3 (* 8 (ucd-value-0 char)))))) (when (< decimal-digit 10) decimal-digit))) (defun char-code (char) #!+sb-doc "Return the integer code of CHAR." ;; FIXME: do we actually need this? (etypecase char (character (char-code (truly-the character char))))) (defun char-int (char) #!+sb-doc "Return the integer code of CHAR. (In SBCL this is the same as CHAR-CODE, as there are no character bits or fonts.)" (char-code char)) (defun code-char (code) #!+sb-doc "Return the character with the code CODE." (code-char code)) (defun character (object) #!+sb-doc "Coerce OBJECT into a CHARACTER if possible. Legal inputs are characters, strings and symbols of length 1." (flet ((do-error (control args) (error 'simple-type-error :datum object ;;?? how to express "symbol with name of length 1"? :expected-type '(or character (string 1)) :format-control control :format-arguments args))) (typecase object (character object) (string (if (= 1 (length (the string object))) (char object 0) (do-error "String is not of length one: ~S" (list object)))) (symbol (if (= 1 (length (symbol-name object))) (schar (symbol-name object) 0) (do-error "Symbol name is not of length one: ~S" (list object)))) (t (do-error "~S cannot be coerced to a character." (list object)))))) (defun char-name (char) #!+sb-doc "Return the name (a STRING) for a CHARACTER object." (let ((char-code (char-code char))) (or (second (assoc char-code *base-char-name-alist*)) #!+sb-unicode (let ((h-code (cdr (binary-search char-code (car *unicode-character-name-database*) :key #'car)))) (cond (h-code (huffman-decode h-code *unicode-character-name-huffman-tree*)) ((< char-code #x10000) (format nil "U~4,'0X" char-code)) (t (format nil "U~8,'0X" char-code))))))) (defun name-char (name) #!+sb-doc "Given an argument acceptable to STRING, NAME-CHAR returns a character whose name is that string, if one exists. Otherwise, NIL is returned." (or (let ((char-code (car (rassoc-if (lambda (names) (member name names :test #'string-equal)) *base-char-name-alist*)))) (when char-code (code-char char-code))) #!+sb-unicode (let ((encoding (huffman-encode (string-upcase name) *unicode-character-name-huffman-tree*))) (when encoding (let* ((char-code (car (binary-search encoding (cdr *unicode-character-name-database*) :key #'cdr))) (name-string (string name)) (name-length (length name-string))) (cond (char-code (code-char char-code)) ((and (or (= name-length 9) (= name-length 5)) (char-equal (char name-string 0) #\U) (loop for i from 1 below name-length always (digit-char-p (char name-string i) 16))) (code-char (parse-integer name-string :start 1 :radix 16))) (t nil))))))) ;;;; predicates (defun standard-char-p (char) #!+sb-doc "The argument must be a character object. STANDARD-CHAR-P returns T if the argument is a standard character -- one of the 95 ASCII printing characters or ." (and (typep char 'base-char) (let ((n (char-code (the base-char char)))) (or (< 31 n 127) (= n 10))))) (defun %standard-char-p (thing) #!+sb-doc "Return T if and only if THING is a standard-char. Differs from STANDARD-CHAR-P in that THING doesn't have to be a character." (and (characterp thing) (standard-char-p thing))) (defun graphic-char-p (char) #!+sb-doc "The argument must be a character object. GRAPHIC-CHAR-P returns T if the argument is a printing character (space through ~ in ASCII), otherwise returns NIL." (let ((n (char-code char))) (or (< 31 n 127) (< 159 n)))) (defun alpha-char-p (char) #!+sb-doc "The argument must be a character object. ALPHA-CHAR-P returns T if the argument is an alphabetic character, A-Z or a-z; otherwise NIL." (< (ucd-general-category char) 5)) (defun upper-case-p (char) #!+sb-doc "The argument must be a character object; UPPER-CASE-P returns T if the argument is an upper-case character, NIL otherwise." (= (ucd-value-0 char) 0)) (defun lower-case-p (char) #!+sb-doc "The argument must be a character object; LOWER-CASE-P returns T if the argument is a lower-case character, NIL otherwise." (= (ucd-value-0 char) 1)) (defun both-case-p (char) #!+sb-doc "The argument must be a character object. BOTH-CASE-P returns T if the argument is an alphabetic character and if the character exists in both upper and lower case. For ASCII, this is the same as ALPHA-CHAR-P." (< (ucd-value-0 char) 2)) (defun digit-char-p (char &optional (radix 10.)) #!+sb-doc "If char is a digit in the specified radix, returns the fixnum for which that digit stands, else returns NIL." (let ((m (- (char-code char) 48))) (declare (fixnum m)) (cond ((<= radix 10.) ;; Special-case decimal and smaller radices. (if (and (>= m 0) (< m radix)) m nil)) ;; Digits 0 - 9 are used as is, since radix is larger. ((and (>= m 0) (< m 10)) m) ;; Check for upper case A - Z. ((and (>= (setq m (- m 7)) 10) (< m radix)) m) ;; Also check lower case a - z. ((and (>= (setq m (- m 32)) 10) (< m radix)) m) ;; Else, fail. (t (let ((number (ucd-decimal-digit char))) (when (and number (< number radix)) number)))))) (defun alphanumericp (char) #!+sb-doc "Given a character-object argument, ALPHANUMERICP returns T if the argument is either numeric or alphabetic." (let ((gc (ucd-general-category char))) (or (< gc 5) (= gc 12)))) (defun char= (character &rest more-characters) #!+sb-doc "Return T if all of the arguments are the same character." (dolist (c more-characters t) (declare (type character c)) (unless (eq c character) (return nil)))) (defun char/= (character &rest more-characters) #!+sb-doc "Return T if no two of the arguments are the same character." (do* ((head character (car list)) (list more-characters (cdr list))) ((null list) t) (declare (type character head)) (dolist (c list) (declare (type character c)) (when (eq head c) (return-from char/= nil))))) (defun char< (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly increasing alphabetic order." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (< (char-int c) (char-int (car list))) (return nil)))) (defun char> (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly decreasing alphabetic order." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (> (char-int c) (char-int (car list))) (return nil)))) (defun char<= (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly non-decreasing alphabetic order." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (<= (char-int c) (char-int (car list))) (return nil)))) (defun char>= (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly non-increasing alphabetic order." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (>= (char-int c) (char-int (car list))) (return nil)))) ;;; EQUAL-CHAR-CODE is used by the following functions as a version of CHAR-INT ;;; which loses font, bits, and case info. (defmacro equal-char-code (character) (let ((ch (gensym))) `(let ((,ch ,character)) (if (= (ucd-value-0 ,ch) 0) (ucd-value-1 ,ch) (char-code ,ch))))) (defun char-equal (character &rest more-characters) #!+sb-doc "Return T if all of the arguments are the same character. Font, bits, and case are ignored." (do ((clist more-characters (cdr clist))) ((null clist) t) (unless (= (equal-char-code (car clist)) (equal-char-code character)) (return nil)))) (defun char-not-equal (character &rest more-characters) #!+sb-doc "Return T if no two of the arguments are the same character. Font, bits, and case are ignored." (do* ((head character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (do* ((l list (cdr l))) ((null l) t) (if (= (equal-char-code head) (equal-char-code (car l))) (return nil))) (return nil)))) (defun char-lessp (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly increasing alphabetic order. Font, bits, and case are ignored." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (< (equal-char-code c) (equal-char-code (car list))) (return nil)))) (defun char-greaterp (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly decreasing alphabetic order. Font, bits, and case are ignored." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (> (equal-char-code c) (equal-char-code (car list))) (return nil)))) (defun char-not-greaterp (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly non-decreasing alphabetic order. Font, bits, and case are ignored." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (<= (equal-char-code c) (equal-char-code (car list))) (return nil)))) (defun char-not-lessp (character &rest more-characters) #!+sb-doc "Return T if the arguments are in strictly non-increasing alphabetic order. Font, bits, and case are ignored." (do* ((c character (car list)) (list more-characters (cdr list))) ((null list) t) (unless (>= (equal-char-code c) (equal-char-code (car list))) (return nil)))) ;;;; miscellaneous functions (defun char-upcase (char) #!+sb-doc "Return CHAR converted to upper-case if that is possible. Don't convert lowercase eszet (U+DF)." (if (= (ucd-value-0 char) 1) (code-char (ucd-value-1 char)) char)) (defun char-downcase (char) #!+sb-doc "Return CHAR converted to lower-case if that is possible." (if (= (ucd-value-0 char) 0) (code-char (ucd-value-1 char)) char)) (defun digit-char (weight &optional (radix 10)) #!+sb-doc "All arguments must be integers. Returns a character object that represents a digit of the given weight in the specified radix. Returns NIL if no such character exists." (and (typep weight 'fixnum) (>= weight 0) (< weight radix) (< weight 36) (code-char (if (< weight 10) (+ 48 weight) (+ 55 weight)))))