diff options
Diffstat (limited to 'lisp/language/misc-lang.el')
| -rw-r--r-- | lisp/language/misc-lang.el | 63 |
1 files changed, 58 insertions, 5 deletions
diff --git a/lisp/language/misc-lang.el b/lisp/language/misc-lang.el index e25e63b4c5c..0a274f144c2 100644 --- a/lisp/language/misc-lang.el +++ b/lisp/language/misc-lang.el @@ -1,4 +1,4 @@ -;;; misc-lang.el --- support for miscellaneous languages (characters) +;;; misc-lang.el --- support for miscellaneous languages (characters) -*- lexical-binding: t; -*- ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, ;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 @@ -136,10 +136,63 @@ thin (i.e. 1-dot width) space." (set-char-table-range composition-function-table '(#x600 . #x74F) - (list (vector "[\u0600-\u074F\u200C\u200D]+" 0 - 'arabic-shape-gstring) - (vector "[\u200C\u200D][\u0600-\u074F\u200C\u200D]+" 1 - 'arabic-shape-gstring))) + (list (vector "[\u200C\u200D][\u0600-\u074F\u200C\u200D]+" + 1 'arabic-shape-gstring) + (vector "[\u0600-\u074F\u200C\u200D]+" + 0 'arabic-shape-gstring))) + +;; The Egyptian Hieroglyph Format Controls were introduced in Unicode +;; Standard v12.0. Apparently, they are not yet well supported in +;; existing fonts, as of late 2020. But there's no reason for us not +;; to be ready for when they will be! +;; The below is needed to support the arrangement of the Egyptian +;; Hieroglyphs in "quadrats", as directed by the format controls, +;; which specify how the hieroglyphs should be joined horizontally and +;; vertically. +(defun egyptian-shape-grouping (gstring direction) + (if (= (lgstring-char gstring 0) #x13437) + (let ((nchars (lgstring-char-len gstring)) + (i 1) + (nesting 1) + ch) + ;; Find where this group ends. + (while (and (< i nchars) (> nesting 0)) + (setq ch (lgstring-char gstring i)) + (cond + ((= ch #x13437) + (setq nesting (1+ nesting))) + ((= ch #x13438) + (setq nesting (1- nesting)))) + (setq i (1+ i))) + (when (zerop nesting) + ;; Make a new gstring from the characters that constitute a + ;; complete nested group. + (let ((new-header (make-vector (1+ i) nil)) + (new-gstring (make-vector (+ i 2) nil))) + (aset new-header 0 (lgstring-font gstring)) + (dotimes (j i) + (aset new-header (1+ j) (lgstring-char gstring j)) + (lgstring-set-glyph new-gstring j (lgstring-glyph gstring j))) + (lgstring-set-header new-gstring new-header) + (font-shape-gstring new-gstring direction)))))) + +(let ((hieroglyph "[\U00013000-\U0001342F]")) + ;; HORIZONTAL/VERTICAL JOINER and INSERT AT.../OVERLAY controls + (set-char-table-range + composition-function-table + '(#x13430 . #x13436) + (list (vector (concat hieroglyph "[\U00013430-\U00013436]" hieroglyph) + ;; We use font-shape-gstring so that, if the font + ;; doesn't support these controls, the glyphs are + ;; displayed individually, and not as a single + ;; grapheme cluster. + 1 'font-shape-gstring))) + ;; Grouping controls + (set-char-table-range + composition-function-table + #x13437 + (list (vector "\U00013437[\U00013000-\U0001343F]+" + 0 'egyptian-shape-grouping)))) (provide 'misc-lang) |