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This is as per "Tips for Documentation Strings" in the elisp manual. For consistency, do the same in diagnostics and comments.
142 lines
4.7 KiB
EmacsLisp
142 lines
4.7 KiB
EmacsLisp
;;; tv-util.el --- support for Tai Viet -*- coding: utf-8 -*-
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;; Copyright (C) 2007, 2008, 2009, 2010, 2011
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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, Tai Viet, i18n
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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 <http://www.gnu.org/licenses/>.
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;;; Code
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;; Regexp matching with a sequence of Tai Viet characters.
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(defconst tai-viet-re "[\xaa80-\xaac2\xaadb-\xaadf]+")
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;; Char-table of information about glyph type of Tai Viet characters.
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(defconst tai-viet-glyph-info
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(let ((table (make-char-table nil))
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(specials '((right-overhang . "ꪊꪋꪌꪍꪏꪓꪖꪜꪞꪡꪤꪨ")
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(left-overhang . "ꫂ")
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(combining-vowel . "ꪴꪰꪲꪳꪷꪸꪾ")
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(combining-tone . "꪿꫁")
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(misc . "-"))))
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;; Set all TaiViet characters to t.
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(set-char-table-range table (cons #xaa80 #xaac2) t)
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(set-char-table-range table (cons #xaadb #xaadf) t)
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;; Overwrite it for special characters.
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(dolist (elt specials)
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(let ((category (car elt))
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(chars (cdr elt)))
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(dotimes (i (length chars))
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(aset table (aref chars i) category))))
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table))
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(defun tai-viet-compose-string (from to string)
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"Compose Tai Viet characters in STRING between indices FROM and TO."
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(let* ((ch (aref string from))
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(info (aref tai-viet-glyph-info ch))
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prev-info)
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(if (eq info 'non-spacing)
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(compose-string string from (1+ from) (string ch ?\t)))
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(setq from (1+ from) prev-info info)
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(while (and (< from to)
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(>= #xaa80 (setq ch (aref string from)))
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(<= #xaaDF ch))
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(setq info (aref tai-viet-glyph-info ch))
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(if (and (eq info 'non-spacing)
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(eq prev-info 'non-spacing))
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(compose-string from (1+ from) (string ?\t ch)))
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(setq from (1+ from) prev-info info))
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(if (eq info 'right-overhang)
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(compose-string string (1- from) from (string ch ?\t)))
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from))
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(defun tai-viet-compose-region (from to)
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"Compose Tai Viet characters in the region between FROM and TO."
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(decompose-region from to)
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(let ((normal-rule '(Br . Bl))
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(tone-rule '(tr . bl))
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(prev-viet nil)
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ch info pos components overhang)
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(while (< from to)
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(or ch
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(setq ch (char-after from)
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info (aref tai-viet-glyph-info ch)))
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(setq from (1+ from))
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(if (not info)
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(setq prev-viet nil
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ch nil)
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(if (memq info '(combining-vowel combining-tone))
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(progn
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;; Display this as a spacing glyph.
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(compose-region (1- from) from (string ?\t ch))
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(setq prev-viet t
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ch nil))
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(setq pos (1- from)
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components ch
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overhang (if (eq info 'right-overhang)
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'right-overhang
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(if (and (not prev-viet) (eq info 'left-overhang))
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'left-overhang))
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prev-viet t
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ch nil)
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(if (and (< from to)
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(setq ch (char-after from)
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info (aref tai-viet-glyph-info ch)))
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(if (memq info '(combining-vowel combining-tone))
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(progn
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(setq components
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(list components normal-rule ch)
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from (1+ from)
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ch nil)
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(if (and (< from to)
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(setq ch (char-after from)
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info (aref tai-viet-glyph-info ch))
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(eq info 'combining-tone))
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(setq components (nconc components
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(list tone-rule ch))
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from (1+ from)))
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(if (eq overhang 'left-overhang)
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(setq components (cons ?\t
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(cons normal-rule components)))
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(if (and (eq overhang 'right-overhang)
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(>= from to))
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(setq components (nconc components
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(list normal-rule ?\t)))))
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(compose-region pos from components))
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(if (eq overhang 'left-overhang)
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(compose-region pos from (string ?\t components))))
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(if (eq overhang 'left-overhang)
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(compose-region pos from (string ?\t components))
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(if (and (eq overhang 'right-overhang) (>= from to))
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(compose-region pos from (string components ?\t))))))))
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from))
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;;;###autoload
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(defun tai-viet-composition-function (from to font-object string)
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(if string
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(if (string-match tai-viet-re string from)
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(tai-viet-compose-string from (match-end 0) string))
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(goto-char from)
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(if (looking-at tai-viet-re)
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(tai-viet-compose-region from (match-end 0)))))
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;;
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(provide 'tai-viet-util)
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