(in-package "SB-COLD")

;;; Common

(defparameter *output-directory*
  (merge-pathnames
   (make-pathname :directory '(:relative :up "output"))
   (make-pathname :directory (pathname-directory *load-truename*))))

(defparameter *page-size-exponent* 8)

(defun cp-high (cp)
  (ash cp (- *page-size-exponent*)))

(defun cp-low (cp)
  (ldb (byte *page-size-exponent* 0) cp))

;;; Generator

(defstruct ucd misc transform)

(defparameter *unicode-character-database*
  (make-pathname :directory (pathname-directory *load-truename*)))

(defparameter *ucd-base* nil)
(defparameter *unicode-names* (make-hash-table))

(defparameter *last-uppercase* nil)
(defparameter *uppercase-transition-count* 0)
(defparameter *different-titlecases* nil)
(defparameter *different-numerics* nil)
(defparameter *name-size* 0)
(defparameter *misc-hash* (make-hash-table :test #'equal))
(defparameter *misc-index* -1)
(defparameter *misc-table* nil)
(defparameter *misc-mapping* nil)
(defparameter *both-cases* nil)
(defparameter *decompositions* nil)
(defparameter *decomposition-length-max* nil)
(defparameter *decomposition-types* nil)
(defparameter *decomposition-base* nil)

(defun hash-misc (gc-index bidi-index ccc-index decimal-digit digit
                  bidi-mirrored cl-both-case-p)
  (let* ((list (list gc-index bidi-index ccc-index decimal-digit digit
                     bidi-mirrored cl-both-case-p))
         (index (gethash list *misc-hash*)))
    (or index
        (progn
          (vector-push list *misc-table*)
          (setf (gethash list *misc-hash*)
                (incf *misc-index*))))))

(defun compare-misc-entry (left right)
  (destructuring-bind (left-gc-index left-bidi-index left-ccc-index
                       left-decimal-digit left-digit left-bidi-mirrored
                       left-cl-both-case-p)
      left
    (destructuring-bind (right-gc-index right-bidi-index right-ccc-index
                         right-decimal-digit right-digit right-bidi-mirrored
                         right-cl-both-case-p)
        right
      (or (and left-cl-both-case-p (not right-cl-both-case-p))
          (and (or left-cl-both-case-p (not right-cl-both-case-p))
               (or (< left-gc-index right-gc-index)
                   (and (= left-gc-index right-gc-index)
                        (or (< left-bidi-index right-bidi-index)
                            (and (= left-bidi-index right-bidi-index)
                                 (or (< left-ccc-index right-ccc-index)
                                     (and (= left-ccc-index right-ccc-index)
                                          (or (string< left-decimal-digit
                                                       right-decimal-digit)
                                              (and (string= left-decimal-digit
                                                            right-decimal-digit)
                                                   (or (string< left-digit right-digit)
                                                       (and (string= left-digit
                                                                     right-digit)
                                                            (string< left-bidi-mirrored
                                                                     right-bidi-mirrored))))))))))))))))

(defun build-misc-table ()
  (sort *misc-table* #'compare-misc-entry)
  (setq *misc-mapping* (make-array (1+ *misc-index*)))
  (loop for i from 0 to *misc-index*
        do (setf (aref *misc-mapping*
                       (gethash (aref *misc-table* i) *misc-hash*))
                 i)))

(defun slurp-ucd ()
  (setq *last-uppercase* nil)
  (setq *uppercase-transition-count* 0)
  (setq *different-titlecases* nil)
  (setq *different-numerics* nil)
  (setq *name-size* 0)
  (setq *misc-hash* (make-hash-table :test #'equal))
  (setq *misc-index* -1)
  (setq *misc-table* (make-array 256 :fill-pointer 0))
  (setq *both-cases* nil)
  (setq *decompositions* 0)
  (setq *decomposition-types* (make-hash-table :test #'equal))
  (setq *decomposition-length-max* 0)
  (setq *decomposition-base* (make-array (ash #x110000
                                              (- *page-size-exponent*))
                                         :initial-element nil))
  (setq *ucd-base* (make-array (ash #x110000 (- *page-size-exponent*))
                               :initial-element nil))
  (with-open-file (*standard-input*
                   (make-pathname :name "UnicodeData"
                                  :type "txt"
                                  :defaults *unicode-character-database*)
                   :direction :input)
    (loop for line = (read-line nil nil)
          while line
          do (slurp-ucd-line line)))
  (second-pass)
  (build-misc-table)
  (fixup-hangul-syllables)
  *decompositions*)

(defun fixup-hangul-syllables ()
  ;; "Hangul Syllable Composition, Unicode 5.1 section 3-12"
  (let* ((sbase #xac00)
         (lbase #x1100)
         (vbase #x1161)
         (tbase #x11a7)
         (scount 11172)
         (lcount 19)
         (vcount 21)
         (tcount 28)
         (ncount (* vcount tcount))
         (table (make-hash-table)))
    (with-open-file (*standard-input*
                     (make-pathname :name "Jamo" :type "txt"
                                    :defaults *unicode-character-database*))
      (loop for line = (read-line nil nil)
            while line
            if (position #\; line)
            do (add-jamo-information line table)))
    (dotimes (sindex scount)
      (let* ((l (+ lbase (floor sindex ncount)))
             (v (+ vbase (floor (mod sindex ncount) tcount)))
             (tee (+ tbase (mod sindex tcount)))
             (name (format nil "HANGUL_SYLLABLE_~A~A~:[~A~;~]"
                           (gethash l table) (gethash v table)
                           (= tee tbase) (gethash tee table))))
        (setf (gethash (+ sbase sindex) *unicode-names*) name)))))

(defun add-jamo-information (line table)
  (let* ((split (split-string line #\;))
         (code (parse-integer (first split) :radix 16))
         (syllable (string-trim '(#\Space)
                                (subseq (second split) 0 (position #\# (second split))))))
    (setf (gethash code table) syllable)))

(defun split-string (line character)
  (loop for prev-position = 0 then (1+ position)
        for position = (position character line :start prev-position)
        collect (subseq line prev-position position)
        do (unless position
             (loop-finish))))

(defun init-indices (strings)
  (let ((hash (make-hash-table :test #'equal)))
    (loop for string in strings
          for index from 0
          do (setf (gethash string hash) index))
    hash))

(defparameter *general-categories*
  (init-indices '("Lu" "Ll" "Lt" "Lm" "Lo" "Cc" "Cf" "Co" "Cs" "Mc"
                  "Me" "Mn" "Nd" "Nl" "No" "Pc" "Pd" "Pe" "Pf" "Pi"
                  "Po" "Ps" "Sc" "Sk" "Sm" "So" "Zl" "Zp" "Zs")))
(defparameter *bidi-classes*
  (init-indices '("AL" "AN" "B" "BN" "CS" "EN" "ES" "ET" "L" "LRE" "LRO"
                  "NSM" "ON" "PDF" "R" "RLE" "RLO" "S" "WS")))


(defparameter *block-first* nil)

(defun normalize-character-name (name)
  (when (find #\_ name)
    (error "Bad name for a character: ~A" name))
  (unless (or (zerop (length name)) (find #\< name) (find #\> name))
    (substitute #\_ #\Space name)))

;;;   3400  --  4DB5  : cjk ideograph extension a ;Lo;0;L;;;;;N;;;;;
;;;   AC00  --  D7A3  : hangul syllables ;Lo;0;L;;;;;N;;;;;
;;;   D800  --  F8FF  : surrogates and private use
;;;  20000  --  2A6D6 : cjk ideograph extension b ;Lo;0;L;;;;;N;;;;;
;;;  F0000  --  FFFFD : private use
;;; 100000  --  10FFFD: private use
(defun encode-ucd-line (line code-point)
  (destructuring-bind (name general-category canonical-combining-class
                            bidi-class decomposition-type-and-mapping
                            decimal-digit digit numeric bidi-mirrored
                            unicode-1-name iso-10646-comment simple-uppercase
                            simple-lowercase simple-titlecase)
      line
    (declare (ignore unicode-1-name iso-10646-comment))
    (if (and (> (length name) 8)
             (string= ", First>" name :start2 (- (length name) 8)))
        (progn
          (setq *block-first* code-point)
          nil)
        (let* ((gc-index (or (gethash general-category *general-categories*)
                             (error "unknown general category ~A"
                                    general-category)))
               (bidi-index (or (gethash bidi-class *bidi-classes*)
                               (error "unknown bidirectional class ~A"
                                      bidi-class)))
               (ccc-index (parse-integer canonical-combining-class))
               (digit-index (unless (string= "" decimal-digit)
                              (parse-integer decimal-digit)))
               (upper-index (unless (string= "" simple-uppercase)
                              (parse-integer simple-uppercase :radix 16)))
               (lower-index (unless (string= "" simple-lowercase)
                              (parse-integer simple-lowercase :radix 16)))
               (title-index (unless (string= "" simple-titlecase)
                              (parse-integer simple-titlecase :radix 16)))
               (cl-both-case-p
                (not (null (or (and (= gc-index 0) lower-index)
                               (and (= gc-index 1) upper-index)))))
               (misc-index (hash-misc gc-index bidi-index ccc-index
                                      decimal-digit digit bidi-mirrored
                                      cl-both-case-p)))
          (declare (ignore digit-index))
          (when (and (not cl-both-case-p)
                     (< gc-index 2))
            (format t "~A~%" name))
          (incf *name-size* (length name))
          (when (string/= "" decomposition-type-and-mapping)
            (let ((split (split-string decomposition-type-and-mapping
                                       #\Space)))
              (when (char= #\< (aref (first split) 0))
                (setf (gethash (pop split) *decomposition-types*) t))
              (unless (aref *decomposition-base* (cp-high code-point))
                (setf (aref *decomposition-base* (cp-high code-point))
                      (make-array (ash 1 *page-size-exponent*)
                                  :initial-element nil)))
              (setf (aref (aref *decomposition-base* (cp-high code-point))
                          (cp-low code-point))
                    (mapcar #'(lambda (string)
                                (parse-integer string :radix 16))
                            split))
              (setq *decomposition-length-max*
                    (max *decomposition-length-max* (length split)))
              (incf *decompositions* (length split))))
          (when (and (string/= "" simple-uppercase)
                     (string/= "" simple-lowercase))
            (push (list code-point upper-index lower-index) *both-cases*))
          (when (string/= simple-uppercase simple-titlecase)
            (push (cons code-point title-index) *different-titlecases*))
          (when (string/= digit numeric)
            (push (cons code-point numeric) *different-numerics*))
          (cond
            ((= gc-index 8)
             (unless *last-uppercase*
               (incf *uppercase-transition-count*))
             (setq *last-uppercase* t))
            (t
             (when *last-uppercase*
               (incf *uppercase-transition-count*))
             (setq *last-uppercase* nil)))
          (when (> ccc-index 255)
            (error "canonical combining class too large ~A" ccc-index))
          (let ((result (make-ucd :misc misc-index
                                  :transform (or upper-index lower-index 0))))
            (when (and (> (length name) 7)
                       (string= ", Last>" name :start2 (- (length name) 7)))
              (let ((page-start (ash (+ *block-first*
                                        (ash 1 *page-size-exponent*)
                                        -1)
                                     (- *page-size-exponent*)))
                    (page-end (ash code-point (- *page-size-exponent*))))
                (loop for point from *block-first*
                      below (ash page-start *page-size-exponent*)
                      do (setf (aref (aref *ucd-base* (cp-high point))
                                     (cp-low point))
                               result))
                (loop for page from page-start below page-end
                      do (setf (aref *ucd-base* page)
                               (make-array (ash 1 *page-size-exponent*)
                                           :initial-element result)))
                (loop for point from (ash page-end *page-size-exponent*)
                      below code-point
                      do (setf (aref (aref *ucd-base* (cp-high point))
                                     (cp-low point))
                               result))))
            (values result (normalize-character-name name)))))))

(defun slurp-ucd-line (line)
  (let* ((split-line (split-string line #\;))
         (code-point (parse-integer (first split-line) :radix 16))
         (code-high (ash code-point (- *page-size-exponent*)))
         (code-low (ldb (byte *page-size-exponent* 0) code-point)))
    (unless (aref *ucd-base* code-high)
      (setf (aref *ucd-base* code-high)
            (make-array (ash 1 *page-size-exponent*)
                        :initial-element nil)))
    (multiple-value-bind (encoding name)
        (encode-ucd-line (cdr split-line) code-point)
      (setf (aref (aref *ucd-base* code-high) code-low) encoding
            (gethash code-point *unicode-names*) name))))

(defun second-pass ()
  (loop for i from 0 below (length *ucd-base*)
        when (aref *ucd-base* i)
        do (loop for j from 0 below (length (aref *ucd-base* i))
                 for result = (aref (aref *ucd-base* i) j)
                 when result
                 when (let* ((transform-point (ucd-transform result))
                             (transform-high (ash transform-point
                                                  (- *page-size-exponent*)))
                             (transform-low (ldb (byte *page-size-exponent* 0)
                                                 transform-point)))
                        (and (plusp transform-point)
                             (/= (ucd-transform
                                  (aref (aref *ucd-base* transform-high)
                                        transform-low))
                                 (+ (ash i *page-size-exponent*) j))))
                 do (destructuring-bind (gc-index bidi-index ccc-index
                                         decimal-digit digit bidi-mirrored
                                         cl-both-case-p)
                        (aref *misc-table* (ucd-misc result))
                      (declare (ignore cl-both-case-p))
                      (format t "~A~%" (+ (ash i *page-size-exponent*) j))
                      (setf (ucd-misc result)
                            (hash-misc gc-index bidi-index ccc-index
                                       decimal-digit digit bidi-mirrored
                                       nil))))))

(defun write-3-byte (triplet stream)
  (write-byte (ldb (byte 8 0) triplet) stream)
  (write-byte (ldb (byte 8 8) triplet) stream)
  (write-byte (ldb (byte 8 16) triplet) stream))

(defun digit-to-byte (digit)
  (if (string= "" digit)
      255
      (parse-integer digit)))

(defun output ()
  (let ((hash (make-hash-table :test #'equalp))
        (index 0))
    (loop for page across *ucd-base*
          do (when page
               (unless (gethash page hash)
                 (setf (gethash page hash)
                       (incf index)))))
    (let ((array (make-array (1+ index))))
      (maphash #'(lambda (key value)
                   (setf (aref array value) key))
               hash)
      (setf (aref array 0)
            (make-array (ash 1 *page-size-exponent*) :initial-element nil))
      (with-open-file (stream (make-pathname :name "ucd"
                                             :type "dat"
                                             :defaults *output-directory*)
                              :direction :output
                              :element-type '(unsigned-byte 8)
                              :if-exists :supersede
                              :if-does-not-exist :create)
        (loop for (gc-index bidi-index ccc-index decimal-digit digit
                            bidi-mirrored)
              across *misc-table*
              do (write-byte gc-index stream)
              do (write-byte bidi-index stream)
              do (write-byte ccc-index stream)
              do (write-byte (digit-to-byte decimal-digit) stream)
              do (write-byte (digit-to-byte digit) stream)
              do (write-byte (if (string= "N" bidi-mirrored) 0 1) stream)
              do (write-byte 0 stream)
              do (write-byte 0 stream))
        (loop for page across *ucd-base*
           do (write-byte (if page (gethash page hash) 0) stream))
        (loop for page across array
           do (loop for entry across page
                 do (write-byte (if entry
                                    (aref *misc-mapping* (ucd-misc entry))
                                    255)
                                stream)
                 do (write-3-byte (if entry (ucd-transform entry) 0)
                                  stream))))))
  (with-open-file (f (make-pathname :name "ucd-names" :type "lisp-expr"
                                    :defaults *output-directory*)
                     :direction :output
                     :if-exists :supersede
                     :if-does-not-exist :create)
    (with-standard-io-syntax
      (write-string ";;; Do not edit by hand: generated by ucd.lisp" f)
      (maphash (lambda (code name)
                 (when name
                  (print code f)
                  (prin1 name f)))
               *unicode-names*))
    (setf *unicode-names* nil))
  (with-open-file (*standard-output*
                   (make-pathname :name "numerics"
                                  :type "lisp-expr"
                                  :defaults *output-directory*)
                   :direction :output
                   :if-exists :supersede
                   :if-does-not-exist :create)
    (with-standard-io-syntax
      (let ((*print-pretty* t))
        (prin1 (mapcar #'(lambda (x) (cons (car x) (read-from-string (cdr x))))
                       *different-numerics*)))))
  (with-open-file (*standard-output*
                   (make-pathname :name "titlecases"
                                  :type "lisp-expr"
                                  :defaults *output-directory*)
                   :direction :output
                   :if-exists :supersede
                   :if-does-not-exist :create)
    (with-standard-io-syntax
      (let ((*print-pretty* t))
        (prin1 *different-titlecases*))))
  (with-open-file (*standard-output*
                   (make-pathname :name "misc"
                                  :type "lisp-expr"
                                  :defaults *output-directory*)
                   :direction :output
                   :if-exists :supersede
                   :if-does-not-exist :create)
    (with-standard-io-syntax
      (let ((*print-pretty* t))
        (prin1 `(:length ,(length *misc-table*)
                 :uppercase ,(loop for (gc-index) across *misc-table*
                                for i from 0
                                when (= gc-index 0)
                                collect i)
                 :lowercase ,(loop for (gc-index) across *misc-table*
                                for i from 0
                                when (= gc-index 1)
                                collect i)
                 :titlecase ,(loop for (gc-index) across *misc-table*
                                for i from 0
                                when (= gc-index 2)
                                collect i))))))
  (values))

;;; Use of the generated files

(defparameter *compiled-ucd* nil)

(defun read-compiled-ucd ()
  (with-open-file (stream (make-pathname :name "ucd"
                                         :type "dat"
                                         :defaults *output-directory*)
                          :direction :input
                          :element-type '(unsigned-byte 8))
    (let ((length (file-length stream)))
      (setq *compiled-ucd*
            (make-array length :element-type '(unsigned-byte 8)))
      (read-sequence *compiled-ucd* stream)))
  (values))

;;; The stuff below is dependent on misc.lisp-expr being
;;; (:LENGTH 215 :UPPERCASE (0 2) :LOWERCASE (1 3) :TITLECASE (4)).
;;;
;;; There are two entries for UPPERCASE and LOWERCASE because some
;;; characters have case (by Unicode standards) but are not
;;; transformable character-by-character in a locale-independent way
;;; (as CL requires for its standard operators).
;;;
;;; for more details on these debugging functions, see the description
;;; of the character database format in src/code/target-char.lisp

(defparameter *length* 215)

(defun cp-index (cp)
  (let* ((cp-high (cp-high cp))
         (page (aref *compiled-ucd* (+ (* 8 *length*) cp-high))))
    (+ (* 8 *length*)
       (ash #x110000 (- *page-size-exponent*))
       (* (ash 4 *page-size-exponent*) page)
       (* 4 (cp-low cp)))))

(defun cp-value-0 (cp)
  (aref *compiled-ucd* (cp-index cp)))

(defun cp-value-1 (cp)
  (let ((index (cp-index cp)))
    (dpb (aref *compiled-ucd* (+ index 3)) (byte 8 16)
         (dpb (aref *compiled-ucd* (+ index 2)) (byte 8 8)
              (aref *compiled-ucd* (1+ index))))))

(defun cp-general-category (cp)
  (aref *compiled-ucd* (* 8 (cp-value-0 cp))))

(defun cp-decimal-digit (cp)
  (let ((decimal-digit (aref *compiled-ucd* (+ 3 (* 8 (cp-value-0 cp))))))
    (and (< decimal-digit 10)
         decimal-digit)))

(defun cp-alpha-char-p (cp)
  (< (cp-general-category cp) 5))

(defun cp-alphanumericp (cp)
  (let ((gc (cp-general-category cp)))
    (or (< gc 5)
        (= gc 12))))

(defun cp-digit-char-p (cp &optional (radix 10))
  (let ((number (or (cp-decimal-digit cp)
                    (and (<= 65 cp 90)
                         (- cp 55))
                    (and (<= 97 cp 122)
                         (- cp 87)))))
    (when (and number (< number radix))
      number)))

(defun cp-graphic-char-p (cp)
  (or (<= 32 cp 127)
      (<= 160 cp)))

(defun cp-char-upcase (cp)
  (if (= (cp-value-0 cp) 1)
      (cp-value-1 cp)
      cp))

(defun cp-char-downcase (cp)
  (if (= (cp-value-0 cp) 0)
      (cp-value-1 cp)
      cp))

(defun cp-upper-case-p (cp)
  (= (cp-value-0 cp) 0))

(defun cp-lower-case-p (cp)
  (= (cp-value-0 cp) 1))

(defun cp-both-case-p (cp)
  (< (cp-value-0 cp) 2))