14 files changed, 185 insertions, 120 deletions

diff --git a/tex/context/base/char-utf.lua b/tex/context/base/char-utf.lua
index 43591dd76..4817c3537 100644
--- a/tex/context/base/char-utf.lua
+++ b/tex/context/base/char-utf.lua
@@ -35,6 +35,9 @@ local characters      = characters
 characters.graphemes  = allocate()
 local graphemes       = characters.graphemes
 
+characters.combined   = allocate()
+local combined        = characters.combined
+
 characters.decomposed = allocate()
 local decomposed      = characters.decomposed
 
@@ -73,32 +76,45 @@ local decomposed = allocate {
 }
 characters.decomposed = decomposed
 
-local function initialize()
-    for unicode, v in next, characters.data do
+local function initialize() -- maybe only 'mn'
+    local data = characters.data
+    for unicode, v in next, data do
         -- using vs and first testing for length is faster (.02->.01 s)
         local vs = v.specials
-        if vs and #vs == 3 and vs[1] == 'char' then
+        if vs and #vs == 3 and vs[1] == "char" then
             local one, two = vs[2], vs[3]
-            local first, second, combined = utfchar(one), utfchar(two), utfchar(unicode)
+            if data[two].category == "mn" then
+                local cgf = combined[one]
+                if not cgf then
+                    cgf = { [two] = unicode }
+                    combined[one]  = cgf
+                else
+                    cgf[two] = unicode
+                end
+            end
+            local first, second, combination = utfchar(one), utfchar(two), utfchar(unicode)
             local cgf = graphemes[first]
             if not cgf then
-                cgf = { }
+                cgf = { [second] = combination }
                 graphemes[first] = cgf
+            else
+                cgf[second] = combination
             end
-            cgf[second] = combined
             if v.mathclass or v.mathspec then
                 local mps = mathpairs[two]
                 if not mps then
-                    mps = { }
+                    mps = { [one] = unicode }
                     mathpairs[two] = mps
+                else
+                    mps[one] = unicode -- here unicode
                 end
-                mps[one] = unicode -- here unicode
                 local mps = mathpairs[second]
                 if not mps then
-                    mps = { }
+                    mps = { [first] = combination }
                     mathpairs[second] = mps
+                else
+                    mps[first] = combination
                 end
-                mps[first] = combined
             end
      -- else
      --     local description = v.description
@@ -123,8 +139,11 @@ local function initialize()
         end
     end
     initialize = false
+    characters.initialize = function() end -- when used outside tex
 end
 
+characters.initialize = initialize
+
 -- utffilters.addgrapheme(utfchar(318),'l','\string~')
 -- utffilters.addgrapheme('c','a','b')
 
@@ -441,17 +460,23 @@ function utffilters.decompose(str)
     return str
 end
 
-local textfileactions = resolvers.openers.helpers.textfileactions
+local sequencers = utilities.sequencers
+
+if sequencers then
+
+    local textfileactions = resolvers.openers.helpers.textfileactions
 
-utilities.sequencers.appendaction (textfileactions,"system","characters.filters.utf.collapse")
-utilities.sequencers.disableaction(textfileactions,"characters.filters.utf.collapse")
+    sequencers.appendaction (textfileactions,"system","characters.filters.utf.collapse")
+    sequencers.disableaction(textfileactions,"characters.filters.utf.collapse")
 
-utilities.sequencers.appendaction (textfileactions,"system","characters.filters.utf.decompose")
-utilities.sequencers.disableaction(textfileactions,"characters.filters.utf.decompose")
+    sequencers.appendaction (textfileactions,"system","characters.filters.utf.decompose")
+    sequencers.disableaction(textfileactions,"characters.filters.utf.decompose")
+
+    function characters.filters.utf.enable()
+        sequencers.enableaction(textfileactions,"characters.filters.utf.collapse")
+        sequencers.enableaction(textfileactions,"characters.filters.utf.decompose")
+    end
 
-function characters.filters.utf.enable()
-    utilities.sequencers.enableaction(textfileactions,"characters.filters.utf.collapse")
-    utilities.sequencers.enableaction(textfileactions,"characters.filters.utf.decompose")
 end
 
 --[[ldx--
diff --git a/tex/context/base/cont-new.mkii b/tex/context/base/cont-new.mkii
index 575b21253..0eff1e671 100644
--- a/tex/context/base/cont-new.mkii
+++ b/tex/context/base/cont-new.mkii
@@ -11,7 +11,7 @@
 %C therefore copyrighted by \PRAGMA. See mreadme.pdf for
 %C details.
 
-\newcontextversion{2011.09.05 23:49}
+\newcontextversion{2011.09.06 14:02}
 
 %D This file is loaded at runtime, thereby providing an
 %D excellent place for hacks, patches, extensions and new
diff --git a/tex/context/base/cont-new.mkiv b/tex/context/base/cont-new.mkiv
index 764d14381..907415df8 100644
--- a/tex/context/base/cont-new.mkiv
+++ b/tex/context/base/cont-new.mkiv
@@ -11,7 +11,7 @@
 %C therefore copyrighted by \PRAGMA. See mreadme.pdf for
 %C details.
 
-\newcontextversion{2011.09.05 23:49}
+\newcontextversion{2011.09.06 14:02}
 
 %D This file is loaded at runtime, thereby providing an
 %D excellent place for hacks, patches, extensions and new
diff --git a/tex/context/base/context-version.pdf b/tex/context/base/context-version.pdf
index 9535172fd..fe96d9b72 100644
--- a/tex/context/base/context-version.pdf
+++ b/tex/context/base/context-version.pdf
diff --git a/tex/context/base/context-version.png b/tex/context/base/context-version.png
index 9aa06a1a6..f9dc15ab5 100644
--- a/tex/context/base/context-version.png
+++ b/tex/context/base/context-version.png
diff --git a/tex/context/base/context.mkii b/tex/context/base/context.mkii
index bc8810642..c38fbc41c 100644
--- a/tex/context/base/context.mkii
+++ b/tex/context/base/context.mkii
@@ -20,7 +20,7 @@
 %D your styles an modules.
 
 \edef\contextformat {\jobname}
-\edef\contextversion{2011.09.05 23:49}
+\edef\contextversion{2011.09.06 14:02}
 
 %D For those who want to use this:
 
diff --git a/tex/context/base/context.mkiv b/tex/context/base/context.mkiv
index 9e6170785..e6501b852 100644
--- a/tex/context/base/context.mkiv
+++ b/tex/context/base/context.mkiv
@@ -20,7 +20,7 @@
 %D your styles an modules.
 
 \edef\contextformat {\jobname}
-\edef\contextversion{2011.09.05 23:49}
+\edef\contextversion{2011.09.06 14:02}
 
 %D For those who want to use this:
 
diff --git a/tex/context/base/font-mis.lua b/tex/context/base/font-mis.lua
index b3147ede3..fdb44bb12 100644
--- a/tex/context/base/font-mis.lua
+++ b/tex/context/base/font-mis.lua
@@ -22,7 +22,7 @@ local handlers = fonts.handlers
 handlers.otf   = handlers.otf or { }
 local otf      = handlers.otf
 
-otf.version    = otf.version or 2.733
+otf.version    = otf.version or 2.735
 otf.cache      = otf.cache   or containers.define("fonts", "otf", otf.version, true)
 
 function otf.loadcached(filename,format,sub)
diff --git a/tex/context/base/font-otc.lua b/tex/context/base/font-otc.lua
index fd3d7a761..ae463e750 100644
--- a/tex/context/base/font-otc.lua
+++ b/tex/context/base/font-otc.lua
@@ -51,7 +51,8 @@ local function addfeature(data,feature,specifications)
         local unicodes     = resources.unicodes
         local lookuptypes  = resources.lookuptypes
         local splitter     = lpeg.splitter(" ",unicodes)
-        local done = 0
+        local done         = 0
+        local skip         = 0
         if not specifications[1] then
             -- so we accept a one entry specification
             specifications = { specifications }
@@ -61,6 +62,11 @@ local function addfeature(data,feature,specifications)
             local specification = specifications[s]
             local valid         = specification.valid
             if not valid or valid(data,specification,feature) then
+                local initialize = specification.initialize
+                if initialize then
+                    -- when false is returned we initialize only once
+                    specification.initialize = initialize(specification) and initialize or nil
+                end
                 local askedfeatures = specification.features or everywhere
                 local subtables     = specification.subtables or { specification.data } or { }
                 local featuretype   = types[specification.type or "substitution"]
@@ -82,12 +88,23 @@ local function addfeature(data,feature,specifications)
                                 if type(ligature) == "string" then
                                     ligature = { lpegmatch(splitter,ligature) }
                                 end
-                                if slookups then
-                                    slookups[full] = ligature
+                                local present = true
+                                for i=1,#ligature do
+                                    if not descriptions[ligature[i]] then
+                                        present = false
+                                        break
+                                    end
+                                end
+                                if present then
+                                    if slookups then
+                                        slookups[full] = ligature
+                                    else
+                                        description.slookups = { [full] = ligature }
+                                    end
+                                    done, added = done + 1, true
                                 else
-                                    description.slookups = { [full] = ligature }
+                                    skip = skip + 1
                                 end
-                                done, added = done + 1, true
                             end
                         end
                     elseif featuretype == "gsub_single" then
@@ -98,14 +115,14 @@ local function addfeature(data,feature,specifications)
                             if description then
                                 local slookups = description.slookups
                                 replacement = tonumber(replacement) or unicodes[replacement]
-    if descriptions[replacement] then
-                                if slookups then
-                                    slookups[full] = replacement
-                                else
-                                    description.slookups = { [full] = replacement }
+                                if descriptions[replacement] then
+                                    if slookups then
+                                        slookups[full] = replacement
+                                    else
+                                        description.slookups = { [full] = replacement }
+                                    end
+                                    done, added = done + 1, true
                                 end
-                                done, added = done + 1, true
-    end
                             end
                         end
                     end
@@ -148,8 +165,8 @@ local function addfeature(data,feature,specifications)
                 end
             end
         end
-        if done > 0 and trace_loading then
-            report_otf("enhance: registering %s feature (%s glyphs affected)",feature,done)
+        if trace_loading then
+            report_otf("enhance: registering feature '%s', %s glyphs affected, %s glyphs skipped",feature,done,skip)
         end
     end
 end
@@ -184,9 +201,9 @@ local tlig = {
 
 local tlig_specification = {
     type     = "ligature",
-    features = everywhere, -- { ["*"] = { ["*"] = true } },
+    features = everywhere,
     data     = tlig,
-    flags    = noflags, -- { },
+    flags    = noflags,
 }
 
 otf.addfeature("tlig",tlig_specification)
@@ -206,9 +223,9 @@ local trep = {
 
 local trep_specification = {
     type      = "substitution",
-    features  = everywhere, -- { ["*"] = { ["*"] = true } },
+    features  = everywhere,
     data      = trep,
-    flags     = noflags, -- { },
+    flags     = noflags,
 }
 
 otf.addfeature("trep",trep_specification)
@@ -218,6 +235,39 @@ registerotffeature {
     description = 'tex replacements',
 }
 
+-- tcom
+
+if characters.combined then
+
+    local tcom = { }
+
+    local function initialize()
+        characters.initialize()
+        for first, seconds in next, characters.combined do
+            for second, combination in next, seconds do
+                tcom[combination] = { first, second }
+            end
+        end
+        -- return false
+    end
+
+    local tcom_specification = {
+        type       = "ligature",
+        features   = everywhere,
+        data       = tcom,
+        flags      = noflags,
+        initialize = initialize,
+    }
+
+    otf.addfeature("tcom",tcom_specification)
+
+    registerotffeature {
+        name        = 'tcom',
+        description = 'tex combinations',
+    }
+
+end
+
 -- anum
 
 local anum_arabic = {
diff --git a/tex/context/base/font-otf.lua b/tex/context/base/font-otf.lua
index fe81f8bb1..319cae65b 100644
--- a/tex/context/base/font-otf.lua
+++ b/tex/context/base/font-otf.lua
@@ -47,7 +47,7 @@ local otf                = fonts.handlers.otf
 
 otf.glists               = { "gsub", "gpos" }
 
-otf.version              = 2.733 -- beware: also sync font-mis.lua
+otf.version              = 2.735 -- beware: also sync font-mis.lua
 otf.cache                = containers.define("fonts", "otf", otf.version, true)
 
 local fontdata           = fonts.hashes.identifiers
diff --git a/tex/context/base/font-otn.lua b/tex/context/base/font-otn.lua
index 0cbdea839..a972d50e7 100644
--- a/tex/context/base/font-otn.lua
+++ b/tex/context/base/font-otn.lua
@@ -901,33 +901,6 @@ end
 
 local logwarning = report_subchain
 
-function chainmores.chainsub(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname,n)
-    logprocess("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
-    return start, false
-end
-
--- handled later:
---
--- function chainmores.gsub_single(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
---     return chainprocs.gsub_single(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
--- end
-
-function chainmores.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
-    logprocess("%s: gsub_multiple not yet supported",cref(kind,chainname,chainlookupname))
-    return start, false
-end
-
-function chainmores.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
-    logprocess("%s: gsub_alternate not yet supported",cref(kind,chainname,chainlookupname))
-    return start, false
-end
-
--- handled later:
---
--- function chainmores.gsub_ligature(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
---     return chainprocs.gsub_ligature(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
--- end
-
 local function logprocess(...)
     if trace_steps then
         registermessage(...)
@@ -945,6 +918,11 @@ function chainprocs.chainsub(start,stop,kind,chainname,currentcontext,lookuphash
     return start, false
 end
 
+function chainmores.chainsub(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname,n)
+    logprocess("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
+    return start, false
+end
+
 -- The reversesub is a special case, which is why we need to store the replacements
 -- in a bit weird way. There is no lookup and the replacement comes from the lookup
 -- itself. It is meant mostly for dealing with Urdu.
@@ -1057,7 +1035,7 @@ the match.</p>
 --ldx]]--
 
 function chainprocs.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
-    delete_till_stop(start,stop)
+    delete_till_stop(start,stop) -- we can assume that marks are to be deleted
     local startchar = start.char
     local subtables = currentlookup.subtables
     local lookupname = subtables[1]
@@ -1082,39 +1060,49 @@ function chainprocs.gsub_multiple(start,stop,kind,chainname,currentcontext,looku
     return start, false
 end
 
+-- function chainmores.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
+--     logprocess("%s: gsub_multiple not yet supported",cref(kind,chainname,chainlookupname))
+--     return start, false
+-- end
+
+chainmores.gsub_multiple = chainprocs.gsub_multiple
+
 --[[ldx--
 <p>Here we replace start by new glyph. First we delete the rest of the match.</p>
 --ldx]]--
 
+-- char_1 mark_1 -> char_x mark_1 (ignore marks)
+-- char_1 mark_1 -> char_x
+
+-- to be checked: do we always have just one glyph?
+-- we can also have alternates for marks
+-- marks come last anyway
+-- are there cases where we need to delete the mark
+
 function chainprocs.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
-    -- todo: marks ?
-    local n = delete_till_stop(start,stop)
     local current = start
     local subtables = currentlookup.subtables
-    local m = 0
     while current do
-        if current.id == glyph_code then
-            m = m + 1
+        if current.id == glyph_code then -- is this check needed?
             local currentchar = current.char
             local lookupname = subtables[1]
             local alternatives = lookuphash[lookupname]
             if not alternatives then
                 if trace_bugs then
-                    logwarning("%s: %s of %s, no alternative hit",cref(kind,chainname,chainlookupname,lookupname),m,n)
+                    logwarning("%s: no alternative hit",cref(kind,chainname,chainlookupname,lookupname))
                 end
             else
                 alternatives = alternatives[currentchar]
                 if not alternatives then
                     if trace_bugs then
-                        logwarning("%s:  %s of %s, no alternative for %s",cref(kind,chainname,chainlookupname,lookupname),m,n,gref(currentchar))
+                        logwarning("%s: no alternative for %s",cref(kind,chainname,chainlookupname,lookupname),gref(currentchar))
                     end
                 else
                     local choice, index = alternative_glyph(current,alternatives,kind,chainname,chainlookupname,lookupname)
                     current.char = choice
                     if trace_alternatives then
-                        m = m + 1
-                        logprocess("%s: %s of %s, replacing single %s by alternative %s (%s)",
-                            cref(kind,chainname,chainlookupname,lookupname),m,n,index,gref(currentchar),gref(choice))
+                        logprocess("%s: replacing single %s by alternative %s (%s)",
+                            cref(kind,chainname,chainlookupname,lookupname),index,gref(currentchar),gref(choice))
                     end
                 end
             end
@@ -1128,6 +1116,13 @@ function chainprocs.gsub_alternate(start,stop,kind,chainname,currentcontext,look
     return start, false
 end
 
+-- function chainmores.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
+--     logprocess("%s: gsub_alternate not yet supported",cref(kind,chainname,chainlookupname))
+--     return start, false
+-- end
+
+chainmores.gsub_alternate = chainprocs.gsub_alternate
+
 --[[ldx--
 <p>When we replace ligatures we use a helper that handles the marks. I might change
 this function (move code inline and handle the marks by a separate function). We
diff --git a/tex/context/base/status-files.pdf b/tex/context/base/status-files.pdf
index c8a94ddc3..aaaede636 100644
--- a/tex/context/base/status-files.pdf
+++ b/tex/context/base/status-files.pdf
diff --git a/tex/context/base/status-lua.pdf b/tex/context/base/status-lua.pdf
index 876b2a00b..fa9d18a12 100644
--- a/tex/context/base/status-lua.pdf
+++ b/tex/context/base/status-lua.pdf
diff --git a/tex/generic/context/luatex/luatex-fonts-merged.lua b/tex/generic/context/luatex/luatex-fonts-merged.lua
index 928da0e83..b5fc340a2 100644
--- a/tex/generic/context/luatex/luatex-fonts-merged.lua
+++ b/tex/generic/context/luatex/luatex-fonts-merged.lua
@@ -1,6 +1,6 @@
 -- merged file : luatex-fonts-merged.lua
 -- parent file : luatex-fonts.lua
--- merge date  : 09/05/11 23:49:07
+-- merge date  : 09/06/11 14:02:36
 
 do -- begin closure to overcome local limits and interference
 
@@ -5012,7 +5012,7 @@ local otf                = fonts.handlers.otf
 
 otf.glists               = { "gsub", "gpos" }
 
-otf.version              = 2.733 -- beware: also sync font-mis.lua
+otf.version              = 2.735 -- beware: also sync font-mis.lua
 otf.cache                = containers.define("fonts", "otf", otf.version, true)
 
 local fontdata           = fonts.hashes.identifiers
@@ -8983,33 +8983,6 @@ end
 
 local logwarning = report_subchain
 
-function chainmores.chainsub(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname,n)
-    logprocess("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
-    return start, false
-end
-
--- handled later:
---
--- function chainmores.gsub_single(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
---     return chainprocs.gsub_single(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
--- end
-
-function chainmores.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
-    logprocess("%s: gsub_multiple not yet supported",cref(kind,chainname,chainlookupname))
-    return start, false
-end
-
-function chainmores.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
-    logprocess("%s: gsub_alternate not yet supported",cref(kind,chainname,chainlookupname))
-    return start, false
-end
-
--- handled later:
---
--- function chainmores.gsub_ligature(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
---     return chainprocs.gsub_ligature(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
--- end
-
 local function logprocess(...)
     if trace_steps then
         registermessage(...)
@@ -9027,6 +9000,11 @@ function chainprocs.chainsub(start,stop,kind,chainname,currentcontext,lookuphash
     return start, false
 end
 
+function chainmores.chainsub(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname,n)
+    logprocess("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
+    return start, false
+end
+
 -- The reversesub is a special case, which is why we need to store the replacements
 -- in a bit weird way. There is no lookup and the replacement comes from the lookup
 -- itself. It is meant mostly for dealing with Urdu.
@@ -9139,7 +9117,7 @@ the match.</p>
 --ldx]]--
 
 function chainprocs.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
-    delete_till_stop(start,stop)
+    delete_till_stop(start,stop) -- we can assume that marks are to be deleted
     local startchar = start.char
     local subtables = currentlookup.subtables
     local lookupname = subtables[1]
@@ -9164,39 +9142,49 @@ function chainprocs.gsub_multiple(start,stop,kind,chainname,currentcontext,looku
     return start, false
 end
 
+-- function chainmores.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
+--     logprocess("%s: gsub_multiple not yet supported",cref(kind,chainname,chainlookupname))
+--     return start, false
+-- end
+
+chainmores.gsub_multiple = chainprocs.gsub_multiple
+
 --[[ldx--
 <p>Here we replace start by new glyph. First we delete the rest of the match.</p>
 --ldx]]--
 
+-- char_1 mark_1 -> char_x mark_1 (ignore marks)
+-- char_1 mark_1 -> char_x
+
+-- to be checked: do we always have just one glyph?
+-- we can also have alternates for marks
+-- marks come last anyway
+-- are there cases where we need to delete the mark
+
 function chainprocs.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
-    -- todo: marks ?
-    local n = delete_till_stop(start,stop)
     local current = start
     local subtables = currentlookup.subtables
-    local m = 0
     while current do
-        if current.id == glyph_code then
-            m = m + 1
+        if current.id == glyph_code then -- is this check needed?
             local currentchar = current.char
             local lookupname = subtables[1]
             local alternatives = lookuphash[lookupname]
             if not alternatives then
                 if trace_bugs then
-                    logwarning("%s: %s of %s, no alternative hit",cref(kind,chainname,chainlookupname,lookupname),m,n)
+                    logwarning("%s: no alternative hit",cref(kind,chainname,chainlookupname,lookupname))
                 end
             else
                 alternatives = alternatives[currentchar]
                 if not alternatives then
                     if trace_bugs then
-                        logwarning("%s:  %s of %s, no alternative for %s",cref(kind,chainname,chainlookupname,lookupname),m,n,gref(currentchar))
+                        logwarning("%s: no alternative for %s",cref(kind,chainname,chainlookupname,lookupname),gref(currentchar))
                     end
                 else
                     local choice, index = alternative_glyph(current,alternatives,kind,chainname,chainlookupname,lookupname)
                     current.char = choice
                     if trace_alternatives then
-                        m = m + 1
-                        logprocess("%s: %s of %s, replacing single %s by alternative %s (%s)",
-                            cref(kind,chainname,chainlookupname,lookupname),m,n,index,gref(currentchar),gref(choice))
+                        logprocess("%s: replacing single %s by alternative %s (%s)",
+                            cref(kind,chainname,chainlookupname,lookupname),index,gref(currentchar),gref(choice))
                     end
                 end
             end
@@ -9210,6 +9198,13 @@ function chainprocs.gsub_alternate(start,stop,kind,chainname,currentcontext,look
     return start, false
 end
 
+-- function chainmores.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
+--     logprocess("%s: gsub_alternate not yet supported",cref(kind,chainname,chainlookupname))
+--     return start, false
+-- end
+
+chainmores.gsub_alternate = chainprocs.gsub_alternate
+
 --[[ldx--
 <p>When we replace ligatures we use a helper that handles the marks. I might change
 this function (move code inline and handle the marks by a separate function). We