From 3125c85ca062459ddd50eb9c1d80b35d358deacb Mon Sep 17 00:00:00 2001
From: Philipp Gesang <megas.kapaneus@gmail.com>
Date: Tue, 10 May 2011 18:52:28 +0200
Subject: yet more general Serbian exception handling

---
 .../third/transliterator/trans_tables_sr.lua       | 50 ++++++++++++++--------
 1 file changed, 32 insertions(+), 18 deletions(-)

diff --git a/tex/context/third/transliterator/trans_tables_sr.lua b/tex/context/third/transliterator/trans_tables_sr.lua
index 446f688..8a4744a 100644
--- a/tex/context/third/transliterator/trans_tables_sr.lua
+++ b/tex/context/third/transliterator/trans_tables_sr.lua
@@ -98,24 +98,38 @@ if not translit.done_serbian then
     local P = lpeg.P
     local sub, upper = unicode.utf8.sub, unicode.utf8.upper
 
-    local sre, srei, p_sre, p_sre_i = { }, { }
-    for lat, cyr in next, except do
-        local Lat = upper(sub(lat, 1, 1)) .. sub(lat, 2)
-        local Cyr = upper(sub(cyr, 1, 1)) .. sub(cyr, 2)
-        local LAT, CYR = upper(lat), upper(cyr)
-        local p_lat    = P" " * (P(lat) + Lat + LAT)
-
-        p_sre_i = p_sre_i and p_sre_i + P(lat) + Lat + LAT or P(lat) + Lat + LAT
-        p_sre   = p_sre   and p_sre + p_lat                or p_lat
-
-        srei[lat], srei[Lat], srei[LAT]             = cyr, Cyr, CYR
-        sre[" "..lat], sre[" "..Lat], sre[" "..LAT] = " "..cyr, " "..Cyr, " "..CYR
+    --local e_tocy, e_i_tocy, e_tolt, e_i_tolt = { }, { }, { }, { }
+    local p_tocy, p_i_tocy, p_tolt, p_i_tolt
+
+    for left, right in next, except do -- generating exception patterns for both sides
+        local Left  = upper(sub(left,  1, 1)) .. sub(left,  2)
+        local Right = upper(sub(right, 1, 1)) .. sub(right, 2)
+        local LEFT, RIGHT = upper(left), upper(right)
+
+        local p_i_left    = P(left)  / right  + P(Left)  / Right + P(LEFT)  / RIGHT
+        local p_i_right   = P(right) / left   + P(Right) / Left  + P(RIGHT) / LEFT
+
+        local p_left  = P" " * p_i_left
+        local p_right = P" " * p_i_right
+
+        if not p_tocy then
+            p_tocy   = p_left
+            p_i_tocy = p_i_left
+            p_tolt   = p_right
+            p_i_tolt = p_i_right
+        else
+            p_tocy   = p_tocy   + p_left
+            p_i_tocy = p_i_tocy + p_i_left
+            p_tolt   = p_tolt   + p_right
+            p_i_tolt = p_i_tolt + p_i_right
+        end
     end
 
-    translit.serbian_exceptions        = sre
-    translit.serbian_exceptions_init   = srei
-    translit.p_serbian_exceptions      = p_sre
-    translit.p_serbian_exceptions_init = p_sre_i
+    translit.serbian_exceptions             = { }
+    translit.serbian_exceptions.p_tocy      = p_tocy
+    translit.serbian_exceptions.p_tolt      = p_tolt
+    translit.serbian_exceptions.p_tocy_init = p_i_tocy
+    translit.serbian_exceptions.p_tolt_init = p_i_tolt
 
     translit.done_serbian = true
 end
@@ -129,8 +143,8 @@ local t = translit
 local function sr (mode, text)
     local P, R, Cs = lpeg.P, lpeg.R, lpeg.Cs
     local utfchar  = translit.utfchar
-    local _p_sre   = translit.p_serbian_exceptions      / translit.serbian_exceptions
-    local _p_sre_i = translit.p_serbian_exceptions_init / translit.serbian_exceptions_init
+    local _p_sre    = t.serbian_exceptions["p_" .. mode:match("to..$")]
+    local _p_sre_i  = t.serbian_exceptions["p_" .. mode:match("to..$") .. "_init"]
 
     local trl_sr   = translit.make_add_dict{}
     trl_sr         = t[mode.."_upper"] + t[mode.."_lower"]
-- 
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