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bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
263 lines
9.6 KiB
EmacsLisp
263 lines
9.6 KiB
EmacsLisp
;;; hebrew.el --- support for Hebrew -*- coding: utf-8 -*-
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;; Copyright (C) 2001-2017 Free Software Foundation, Inc.
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;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007, 2008, 2009, 2010, 2011
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H14PRO021
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;; Copyright (C) 2003
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H13PRO009
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;; Keywords: multilingual, Hebrew
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; For Hebrew, the character set ISO8859-8 is supported.
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;; See http://www.ecma.ch/ecma1/STAND/ECMA-121.HTM.
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;; Windows-1255 is also supported.
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;;; Code:
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(define-coding-system 'hebrew-iso-8bit
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"ISO 2022 based 8-bit encoding for Hebrew (MIME:ISO-8859-8)."
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:coding-type 'charset
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:mnemonic ?8
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:charset-list '(iso-8859-8)
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:mime-charset 'iso-8859-8)
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(define-coding-system-alias 'iso-8859-8 'hebrew-iso-8bit)
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;; These are for Explicit and Implicit directionality information, as
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;; defined in RFC 1556.
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(define-coding-system-alias 'iso-8859-8-e 'hebrew-iso-8bit)
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(define-coding-system-alias 'iso-8859-8-i 'hebrew-iso-8bit)
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(set-language-info-alist
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"Hebrew" '((tutorial . "TUTORIAL.he")
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(charset iso-8859-8)
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(coding-priority hebrew-iso-8bit)
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(coding-system hebrew-iso-8bit windows-1255 cp862)
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(nonascii-translation . iso-8859-8)
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(input-method . "hebrew")
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(unibyte-display . hebrew-iso-8bit)
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(sample-text . "Hebrew שלום")
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(documentation . "Bidirectional editing is supported.")))
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(set-language-info-alist
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"Windows-1255" '((coding-priority windows-1255)
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(coding-system windows-1255)
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(documentation . "\
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Support for Windows-1255 encoding, e.g. for Yiddish.
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Bidirectional editing is supported.")))
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(define-coding-system 'windows-1255
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"windows-1255 (Hebrew) encoding (MIME: WINDOWS-1255)"
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:coding-type 'charset
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:mnemonic ?h
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:charset-list '(windows-1255)
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:mime-charset 'windows-1255)
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(define-coding-system-alias 'cp1255 'windows-1255)
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(define-coding-system 'cp862
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"DOS codepage 862 (Hebrew)"
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:coding-type 'charset
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:mnemonic ?D
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:charset-list '(cp862)
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:mime-charset 'cp862)
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(define-coding-system-alias 'ibm862 'cp862)
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;; Return a nested alist of Hebrew character sequences vs the
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;; corresponding glyph of FONT-OBJECT.
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(defun hebrew-font-get-precomposed (font-object)
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(let ((precomposed (font-get font-object 'hebrew-precomposed))
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;; Vector of Hebrew precomposed characters.
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(chars [#xFB2A #xFB2B #xFB2C #xFB2D #xFB2E #xFB2F #xFB30 #xFB31
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#xFB32 #xFB33 #xFB34 #xFB35 #xFB36 #xFB38 #xFB39 #xFB3A
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#xFB3B #xFB3C #xFB3E #xFB40 #xFB41 #xFB43 #xFB44 #xFB46
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#xFB47 #xFB48 #xFB49 #xFB4A #xFB4B #xFB4C #xFB4D #xFB4E])
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;; Vector of decomposition character sequences corresponding
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;; to the above vector.
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(decomposed
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[[#x05E9 #x05C1]
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[#x05E9 #x05C2]
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[#x05E9 #x05BC #x05C1]
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[#x05E9 #x05BC #x05C2]
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[#x05D0 #x05B7]
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[#x05D0 #x05B8]
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[#x05D0 #x05BC]
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[#x05D1 #x05BC]
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[#x05D2 #x05BC]
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[#x05D3 #x05BC]
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[#x05D4 #x05BC]
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[#x05D5 #x05BC]
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[#x05D6 #x05BC]
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[#x05D8 #x05BC]
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[#x05D9 #x05BC]
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[#x05DA #x05BC]
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[#x05DB #x05BC]
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[#x05DC #x05BC]
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[#x05DE #x05BC]
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[#x05E0 #x05BC]
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[#x05E1 #x05BC]
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[#x05E3 #x05BC]
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[#x05E4 #x05BC]
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[#x05E6 #x05BC]
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[#x05E7 #x05BC]
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[#x05E8 #x05BC]
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[#x05E9 #x05BC]
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[#x05EA #x05BC]
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[#x05D5 #x05B9]
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[#x05D1 #x05BF]
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[#x05DB #x05BF]
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[#x05E4 #x05BF]]))
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(unless precomposed
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(setq precomposed (list t))
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(let ((gvec (font-get-glyphs font-object 0 (length chars) chars)))
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(dotimes (i (length chars))
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(if (aref gvec i)
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(set-nested-alist (aref decomposed i) (aref gvec i)
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precomposed))))
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;; Cache the result in FONT-OBJECT's property.
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(font-put font-object 'hebrew-precomposed precomposed))
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precomposed))
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;; Composition function for hebrew. GSTRING is made of a Hebrew base
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;; character followed by Hebrew diacritical marks, or is made of
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;; single Hebrew diacritical mark. Adjust GSTRING to display that
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;; sequence properly. The basic strategy is:
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;;
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;; (1) If there's single diacritical, add padding space to the left
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;; and right of the glyph.
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;;
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;; (2) If the font has OpenType features for Hebrew, ask the OTF
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;; driver the whole work.
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;;
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;; (3) If the font has precomposed glyphs, use them as far as
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;; possible. Adjust the remaining glyphs artificially.
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(defun hebrew-shape-gstring (gstring)
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(let* ((font (lgstring-font gstring))
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(otf (font-get font :otf))
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(nchars (lgstring-char-len gstring))
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header nglyphs base-width glyph precomposed val idx)
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(cond
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((= nchars 1)
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;; Independent diacritical mark. Add padding space to left or
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;; right so that the glyph doesn't overlap with the surrounding
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;; chars.
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(setq glyph (lgstring-glyph gstring 0))
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(let ((width (lglyph-width glyph))
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bearing)
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(if (< (setq bearing (lglyph-lbearing glyph)) 0)
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(lglyph-set-adjustment glyph bearing 0 (- width bearing)))
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(if (> (setq bearing (lglyph-rbearing glyph)) width)
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(lglyph-set-adjustment glyph 0 0 bearing))))
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((or (assq 'hebr (car otf)) (assq 'hebr (cdr otf)))
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;; FONT has OpenType features for Hebrew.
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(font-shape-gstring gstring))
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(t
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;; FONT doesn't have OpenType features for Hebrew.
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;; Try a precomposed glyph.
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;; Now GSTRING is in this form:
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;; [[FONT CHAR1 CHAR2 ... CHARn] nil GLYPH1 GLYPH2 ... GLYPHn nil ...]
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(setq precomposed (hebrew-font-get-precomposed font)
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header (lgstring-header gstring)
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val (lookup-nested-alist header precomposed nil 1))
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(if (and (consp val) (vectorp (car val)))
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;; All characters can be displayed by a single precomposed glyph.
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;; Reform GSTRING to [HEADER nil PRECOMPOSED-GLYPH nil ...]
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(let ((glyph (copy-sequence (car val))))
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(lglyph-set-from-to glyph 0 (1- nchars))
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(lgstring-set-glyph gstring 0 glyph)
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(lgstring-set-glyph gstring 1 nil))
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(if (and (integerp val) (> val 2)
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(setq glyph (lookup-nested-alist header precomposed val 1))
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(consp glyph) (vectorp (car glyph)))
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;; The first (1- VAL) characters can be displayed by a
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;; precomposed glyph. Provided that VAL is 3, the first
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;; two glyphs should be replaced by the precomposed glyph.
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;; In that case, reform GSTRING to:
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;; [HEADER nil PRECOMPOSED-GLYPH GLYPH3 ... GLYPHn nil ...]
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(let* ((ncmp (1- val)) ; number of composed glyphs
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(diff (1- ncmp))) ; number of reduced glyphs
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(setq glyph (copy-sequence (car glyph)))
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(lglyph-set-from-to glyph 0 (1- nchars))
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(lgstring-set-glyph gstring 0 glyph)
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(setq idx ncmp)
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(while (< idx nchars)
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(setq glyph (lgstring-glyph gstring idx))
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(lglyph-set-from-to glyph 0 (1- nchars))
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(lgstring-set-glyph gstring (- idx diff) glyph)
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(setq idx (1+ idx)))
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(lgstring-set-glyph gstring (- idx diff) nil)
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(setq idx (- ncmp diff)
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nglyphs (- nchars diff)))
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(setq glyph (lgstring-glyph gstring 0))
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(lglyph-set-from-to glyph 0 (1- nchars))
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(setq idx 1 nglyphs nchars))
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;; Now IDX is an index to the first non-precomposed glyph.
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;; Adjust positions of the remaining glyphs artificially.
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(if (font-get font :combining-capability)
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(font-shape-gstring gstring)
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(setq base-width (lglyph-width (lgstring-glyph gstring 0)))
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(while (< idx nglyphs)
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(setq glyph (lgstring-glyph gstring idx))
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(lglyph-set-from-to glyph 0 (1- nchars))
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(if (>= (lglyph-lbearing glyph) (lglyph-width glyph))
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;; It seems that this glyph is designed to be rendered
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;; before the base glyph.
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(lglyph-set-adjustment glyph (- base-width) 0 0)
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(if (>= (lglyph-lbearing glyph) 0)
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;; Align the horizontal center of this glyph to the
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;; horizontal center of the base glyph.
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(let ((width (- (lglyph-rbearing glyph)
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(lglyph-lbearing glyph))))
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(lglyph-set-adjustment glyph
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(- (/ (- base-width width) 2)
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(lglyph-lbearing glyph)
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base-width) 0 0))))
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(setq idx (1+ idx)))))))
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gstring))
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(let* ((base "[\u05D0-\u05F2]")
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(combining "[\u0591-\u05BD\u05BF\u05C1-\u05C2\u05C4-\u05C5\u05C7]+")
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(pattern1 (concat base combining))
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(pattern2 (concat base "\u200D" combining)))
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(set-char-table-range
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composition-function-table '(#x591 . #x5C7)
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(list (vector pattern2 3 'hebrew-shape-gstring)
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(vector pattern2 2 'hebrew-shape-gstring)
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(vector pattern1 1 'hebrew-shape-gstring)
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[nil 0 hebrew-shape-gstring]))
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;; Exclude non-combining characters.
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(set-char-table-range
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composition-function-table #x5BE nil)
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(set-char-table-range
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composition-function-table #x5C0 nil)
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(set-char-table-range
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composition-function-table #x5C3 nil)
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(set-char-table-range
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composition-function-table #x5C6 nil))
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(provide 'hebrew)
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;;; hebrew.el ends here
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