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;;; w3m-ccl.el --- CCL programs to process Unicode and internal characters.
;; Copyright (C) 2001, 2003-2007, 2011 TSUCHIYA Masatoshi <tsuchiya@namazu.org>
;; Authors: TSUCHIYA Masatoshi <tsuchiya@namazu.org>,
;; ARISAWA Akihiro <ari@mbf.sphere.ne.jp>
;; Keywords: w3m, WWW, hypermedia
;; This file is a part of emacs-w3m.
;; This program 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 2, or (at your option)
;; any later version.
;; This program 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This file contains CCL programs to process Unicode and internal
;; characters of w3m. For more detail about emacs-w3m, see:
;;
;; http://emacs-w3m.namazu.org/
;;; MEMO:
;; It is possible to support multi scripts without Mule-UCS. For more
;; detail, see [emacs-w3m:01950]
;;; Code:
(eval-and-compile
(cond
((featurep 'xemacs)
(require 'pccl))
(t
(require 'ccl))))
;;; CCL programs:
(eval-when-compile
(if (fboundp 'charset-id)
(if (or (get 'charset-id 'byte-obsolete-info)
(eq (get 'charset-id 'byte-compile) 'byte-compile-obsolete))
(defmacro w3m-charset-id (charset) 0)
(defmacro w3m-charset-id (charset) `(charset-id ,charset)))
(if (fboundp 'charset-id-internal)
(defmacro w3m-charset-id (charset)
`(charset-id-internal ,charset))
(defmacro w3m-charset-id (charset) 0))))
(eval-and-compile
(defconst w3m-internal-characters-alist
'((?\x90 . ? ) ; ANSP (use for empty anchor)
(?\x91 . ? ) ; IMSP (blank around image)
(?\xa0 . ? )) ; NBSP (non breakble space)
"Alist of internal characters v.s. ASCII characters.")
(defun w3m-ccl-write-repeat (charset &optional r0 r1)
(unless r0
(setq r0 'r0))
(unless r1
(setq r1 (if (eq r0 'r1) 'r0 'r1)))
(let ((unibyte (memq charset '(latin-iso8859-1 katakana-jisx0201))))
(if (fboundp 'ccl-compile-write-multibyte-character)
`((,r1 &= ?\x7f)
,@(unless unibyte
`((,r1 |= ((,r0 & ?\x7f) << 7))))
(,r0 = ,(w3m-charset-id charset))
(write-multibyte-character ,r0 ,r1)
(repeat))
`((write ,(w3m-charset-id charset))
,@(unless unibyte
`((write ,r0)))
(write-repeat ,r1)))))
(defconst w3m-ccl-write-euc-japan-character
(when (fboundp 'ccl-compile-read-multibyte-character)
`((read-multibyte-character r1 r0)
(if (r1 == ,(w3m-charset-id 'ascii))
;; (1) ASCII characters
(write-repeat r0))
(if (r1 == ,(w3m-charset-id 'latin-jisx0201))
;; (2) Latin Part of Japanese JISX0201.1976
;; Convert to ASCII
(write-repeat r0))
(r2 = (r1 == ,(w3m-charset-id 'japanese-jisx0208-1978)))
(if ((r1 == ,(w3m-charset-id 'japanese-jisx0208)) | r2)
;; (3) Characters of Japanese JISX0208.
((r1 = ((r0 & 127) | 128))
(r0 = ((r0 >> 7) | 128))
(write r0)
(write-repeat r1)))
(if (r1 == ,(w3m-charset-id 'katakana-jisx0201))
;; (4) Katakana Part of Japanese JISX0201.1976
((r0 |= 128)
(write ?\x8e)
(write-repeat r0)))))
"CCL program to write characters represented in `euc-japan'.")
(defconst w3m-ccl-write-iso-latin-1-character
(when (fboundp 'ccl-compile-read-multibyte-character)
`((read-multibyte-character r1 r0)
(if (r1 == ,(w3m-charset-id 'ascii))
;; (1) ASCII characters
(write-repeat r0))
(if (r1 == ,(w3m-charset-id 'latin-jisx0201))
;; (2) Latin Part of Japanese JISX0201.1976
;; Convert to ASCII
(write-repeat r0))
(if (r1 == ,(w3m-charset-id 'latin-iso8859-1))
;; (3) Latin-1 characters
((r0 |= ?\x80)
(write-repeat r0)))))
"CCL program to write characters represented in `iso-latin-1'.")
(defconst w3m-ccl-generate-ncr
`((r1 = 0)
(r2 = 0)
(loop
(r1 = (r1 << 4))
(r1 |= (r0 & 15))
(r0 = (r0 >> 4))
(if (r0 == 0)
(break)
((r2 += 1)
(repeat))))
(write "&#x")
(loop
(branch (r1 & 15)
,@(mapcar
(lambda (i)
(list 'write (string-to-char (format "%x" i))))
'(0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15)))
(r1 = (r1 >> 4))
(if (r2 == 0)
((write ?\;)
(break))
((r2 -= 1)
(repeat))))
(repeat))
"CCL program to generate a string which represents a UCS codepoint
in NCR (Numeric Character References)."))
(define-ccl-program w3m-euc-japan-decoder
`(2
(loop
(read r0)
;; Process normal EUC characters.
(if (r0 < ?\x80)
(write-repeat r0))
(if (r0 > ?\xa0)
((read r1)
,@(w3m-ccl-write-repeat 'japanese-jisx0208)))
(if (r0 == ?\x8e)
((read r1)
,@(w3m-ccl-write-repeat 'katakana-jisx0201)))
(if (r0 == ?\x8f)
((read r0)
(read r1)
,@(w3m-ccl-write-repeat 'japanese-jisx0212)))
;; Process internal characters used in w3m.
,@(mapcar (lambda (pair)
`(if (r0 == ,(car pair))
(write-repeat ,(cdr pair))))
w3m-internal-characters-alist)
(write-repeat r0))))
(unless (get 'w3m-euc-japan-encoder 'ccl-program-idx)
(define-ccl-program w3m-euc-japan-encoder
`(1 (loop (read r0) (write-repeat r0)))))
(define-ccl-program w3m-iso-latin-1-decoder
`(2
(loop
(read r0)
;; Process ASCII characters.
(if (r0 < ?\x80)
(write-repeat r0))
;; Process Latin-1 characters.
(if (r0 > ?\xa0)
(,@(w3m-ccl-write-repeat 'latin-iso8859-1 'r1)))
;; Process internal characters used in w3m.
,@(mapcar (lambda (pair)
`(if (r0 == ,(car pair))
(write-repeat ,(cdr pair))))
w3m-internal-characters-alist)
(write-repeat r0))))
(unless (get 'w3m-iso-latin-1-encoder 'ccl-program-idx)
(define-ccl-program w3m-iso-latin-1-encoder
`(1 (loop (read r0) (write-repeat r0)))))
(provide 'w3m-ccl)
;;; w3m-ccl.el ends here
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