Add Hebrew shaper.

2 files changed, 35 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 061db502dc5..6bbcc1262b0 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2010-05-25  Kenichi Handa  <handa@m17n.org>
+
+        * language/hebrew.el (hebrew-shape-gstring): New function.
+        Register it in composition-function-table for all Hebrew combining
+        characters.
+
 2010-05-24  Uday S Reddy  <u.s.reddy@cs.bham.ac.uk>  (tiny change)
 
         * textmodes/fill.el (fill-region): Don't fill past the end (bug#6201).
diff --git a/lisp/language/hebrew.el b/lisp/language/hebrew.el
index fd98fcfecb7..5c39bb22416 100644
--- a/lisp/language/hebrew.el
+++ b/lisp/language/hebrew.el
@@ -85,6 +85,35 @@ Bidirectional editing is supported.")))
   :mime-charset 'cp862)
 (define-coding-system-alias 'ibm862 'cp862)
 
+;; Composition function for hebrew.
+(defun hebrew-shape-gstring (gstring)
+  (setq gstring (font-shape-gstring gstring))
+  (let ((header (lgstring-header gstring))
+        (nchars (lgstring-char-len gstring))
+        (nglyphs (lgstring-glyph-len gstring))
+        (base-width (lglyph-width (lgstring-glyph gstring 0))))
+    (while (> nglyphs 1)
+      (setq nglyphs (1- nglyphs))
+      (let* ((glyph (lgstring-glyph gstring nglyphs))
+             (adjust (and glyph (lglyph-adjustment glyph))))
+        (if adjust
+            (setq nglyphs 0)
+          (if (>= (lglyph-lbearing glyph) 0)
+              (lglyph-set-adjustment glyph (- base-width) 0 0))))))
+  gstring)
+
+(let ((pattern1 "[\u05D0-\u05F2][\u0591-\u05BF\u05C1-\u05C5\u05C7]+")
+      (pattern2 "[\u05D0-\u05F2]\u200D[\u0591-\u05BF\u05C1-\u05C5\u05C7]+"))
+  (set-char-table-range
+   composition-function-table '(#x591 . #x5C7)
+   (list (vector pattern2 2 'hebrew-shape-gstring)
+         (vector pattern1 1 'hebrew-shape-gstring)
+         ["[\u0591-\u05C7]" 0 font-shape-gstring]))
+  (set-char-table-range
+   composition-function-table #x5C0 nil)
+  (set-char-table-range
+   composition-function-table #x5C6 nil))
+
 (provide 'hebrew)
 
 ;; arch-tag: 3ca04f32-3f1e-498e-af46-8267498ba5d9