[fontloader] sync with Context as of 2016-04-18

3 files changed, 85 insertions, 22 deletions

diff --git a/src/fontloader/misc/fontloader-font-gbn.lua b/src/fontloader/misc/fontloader-font-gbn.lua
index a645a97..daa072b 100644
--- a/src/fontloader/misc/fontloader-font-gbn.lua
+++ b/src/fontloader/misc/fontloader-font-gbn.lua
@@ -20,6 +20,7 @@ local nuts        = nodes.nuts -- context abstraction of direct nodes
 
 local traverse_id = nuts.traverse_id
 local remove_node = nuts.remove
+local free_node   = nuts.free
 
 local glyph_code  = nodes.nodecodes.glyph
 local disc_code   = nodes.nodecodes.disc
@@ -30,11 +31,13 @@ local tonut       = nuts.tonut
 local getfont     = nuts.getfont
 local getchar     = nuts.getchar
 local getid       = nuts.getid
+local getboth     = nuts.getboth
 local getprev     = nuts.getprev
 local getnext     = nuts.getnext
 local getdisc     = nuts.getdisc
 local setchar     = nuts.setchar
 local setlink     = nuts.setlink
+local setprev     = nuts.setprev
 
 -- from now on we apply ligaturing and kerning here because it might interfere with complex
 -- opentype discretionary handling where the base ligature pass expect some weird extra
@@ -136,7 +139,26 @@ function nodes.handlers.nodepass(head)
         end
         if redundant then
             for i=1,#redundant do
-                remove_node(nuthead,redundant[i],true)
+                local r = redundant[i]
+                local p, n = getboth(r)
+                if r == nuthead then
+                    nuthead = n
+                    setprev(n)
+                else
+                    setlink(p,n)
+                end
+                if b > 0 then
+                    for i=1,b do
+                        local bi = basefonts[i]
+                        if r == bi[1] then
+                            bi[1] = n
+                        end
+                        if r == bi[2] then
+                            bi[2] = n
+                        end
+                    end
+                end
+                free_node(r)
             end
         end
         for d in traverse_id(disc_code,nuthead) do
diff --git a/src/fontloader/misc/fontloader-font-ots.lua b/src/fontloader/misc/fontloader-font-ots.lua
index 0a438d5..6911872 100644
--- a/src/fontloader/misc/fontloader-font-ots.lua
+++ b/src/fontloader/misc/fontloader-font-ots.lua
@@ -696,6 +696,9 @@ end
 
 function handlers.gsub_ligature(head,start,dataset,sequence,ligature)
     local current   = getnext(start)
+    if not current then
+        return head, start, false, nil
+    end
     local stop      = nil
     local startchar = getchar(start)
     if marks[startchar] then
@@ -756,14 +759,30 @@ function handlers.gsub_ligature(head,start,dataset,sequence,ligature)
                 -- kind of weird
                 break
             elseif id == disc_code then
-                if getfield(current,"replace") then
-                    -- this only happens when we didn't normalize ... in a future version we will
-                    -- assume normalization of disc nodes
-                    break
-                else
-                    lastdisc=current
-                    current=getnext(current)
+                -- tricky .. we also need to do pre here
+                local replace = getfield(current,"replace")
+                if replace then
+                    -- of{f-}{}{f}e  o{f-}{}{f}fe  o{-}{}{ff}e (oe and ff ligature)
+                    -- we can end up here when we have a start run .. testruns start at a disc but
+                    -- so here we have the other case: char + disc
+                    while replace do
+                        local char, id = ischar(replace,currentfont)
+                        if char then
+                            local lg = ligature[char] -- can there be multiple in a row? maybe in a bad font
+                            if lg then
+                                ligature = lg
+                                replace  = getnext(replace)
+                            else
+                                return head, start, false, false
+                            end
+                        else
+                            return head, start, false, false
+                        end
+                    end
+                    stop = current
                 end
+                lastdisc = current
+                current  = getnext(current)
             else
                 break
             end
@@ -1287,6 +1306,7 @@ function chainprocs.gsub_ligature(head,start,stop,dataset,sequence,currentlookup
         local nofreplacements = 1
         local skipmark        = currentlookup.flags[1] -- sequence.flags?
         while current do
+            -- todo: ischar ... can there really be disc nodes here?
             local id = getid(current)
             if id == disc_code then
                 if not discfound then
@@ -2761,6 +2781,8 @@ local function kernrun(disc,k_run,font,attr,...)
         next = false
     end
     --
+    -- we need to get rid of this nest mess some day .. has to be done otherwise
+    --
     if pre then
         if k_run(pre,"injections",nil,font,attr,...) then
             done = true
@@ -2768,7 +2790,7 @@ local function kernrun(disc,k_run,font,attr,...)
         if prev then
             local nest = getprev(pre)
             setlink(prev,pre)
-            if k_run(prevmarks,"preinjections",pre,font,attr,...) then -- getnext(pre))
+            if k_run(prevmarks,"preinjections",pre,font,attr,...) then -- or prev?
                 done = true
             end
             setprev(pre,nest)
@@ -2866,7 +2888,7 @@ local function comprun(disc,c_run,...)
         setdisc(disc,pre,post,replace)
     end
     --
-    return getnext(disc), done
+    return getnext(disc), renewed
 end
 
 local function testrun(disc,t_run,c_run,...)
@@ -3006,8 +3028,9 @@ local nesting = 0
 
 local function c_run_single(head,font,attr,lookupcache,step,dataset,sequence,rlmode,handler)
     local done  = false
-    local start = sweephead[head]
-    if start then
+    local sweep = sweephead[head]
+    if sweep then
+        start = sweep
         sweephead[head] = nil
     else
         start = head
@@ -3033,8 +3056,11 @@ local function c_run_single(head,font,attr,lookupcache,step,dataset,sequence,rlm
             end
         elseif char == false then
             return head, done
+        elseif sweep then
+            -- else we loose the rest
+            return head, done
         else
-            -- weird
+            -- in disc component
             start = getnext(start)
         end
     end
@@ -3119,8 +3145,9 @@ end
 
 local function c_run_multiple(head,font,attr,steps,nofsteps,dataset,sequence,rlmode,handler)
     local done  = false
-    local start = sweephead[head]
-    if start then
+    local sweep = sweephead[head]
+    if sweep then
+        start = sweep
         sweephead[head] = nil
     else
         start = head
@@ -3160,8 +3187,11 @@ local function c_run_multiple(head,font,attr,steps,nofsteps,dataset,sequence,rlm
         elseif char == false then
             -- whatever glyph
             return head, done
+        elseif sweep then
+            -- else we loose the rest
+            return head, done
         else
-            -- very unlikely
+            -- in disc component
             start = getnext(start)
         end
     end
diff --git a/src/fontloader/misc/fontloader-font-oup.lua b/src/fontloader/misc/fontloader-font-oup.lua
index 59530af..7edaaf6 100644
--- a/src/fontloader/misc/fontloader-font-oup.lua
+++ b/src/fontloader/misc/fontloader-font-oup.lua
@@ -9,7 +9,7 @@ if not modules then modules = { } end modules ['font-oup'] = {
 local next, type = next, type
 local P, R, S = lpeg.P, lpeg.R, lpeg.S
 local lpegmatch = lpeg.match
-local insert, remove, copy = table.insert, table.remove, table.copy
+local insert, remove, copy, unpack = table.insert, table.remove, table.copy, table.unpack
 
 local formatters        = string.formatters
 local sortedkeys        = table.sortedkeys
@@ -737,8 +737,7 @@ local function stripredundant(fontdata)
 end
 
 function readers.getcomponents(fontdata) -- handy for resolving ligatures when names are missing
-    local resources    = fontdata.resources
-    local descriptions = fontdata.descriptions
+    local resources = fontdata.resources
     if resources then
         local sequences = resources.sequences
         if sequences then
@@ -761,7 +760,7 @@ function readers.getcomponents(fontdata) -- handy for resolving ligatures when n
                             end
                         end
                         for i=1,#steps do
-                        -- we actually had/have this in base mode
+                         -- we actually had/have this in base mode
                             local coverage = steps[i].coverage
                             if coverage then
                                 for k, v in next, coverage do
@@ -773,13 +772,25 @@ function readers.getcomponents(fontdata) -- handy for resolving ligatures when n
                 end
             end
             if next(collected) then
+                -- remove self referring
+             -- for k, v in next, collected do
+             --     for i=1,#v do
+             --         local vi = v[i]
+             --         if vi == k then
+             --          -- report("removing self referring ligature @ slot %5X from collected (1)",k)
+             --             collected[k] = nil
+             --         end
+             --     end
+             -- end
                 while true do
                     local done = false
                     for k, v in next, collected do
                         for i=1,#v do
                             local vi = v[i]
                             if vi == k then
+                             -- report("removing self referring ligature @ slot %5X from collected (2)",k)
                                 collected[k] = nil
+                                break
                             else
                                 local c = collected[vi]
                                 if c then
@@ -787,7 +798,7 @@ function readers.getcomponents(fontdata) -- handy for resolving ligatures when n
                                     local t = { }
                                     local n = i - 1
                                     for j=1,n do
-                                        t[j] = t[j]
+                                        t[j] = v[j]
                                     end
                                     for j=1,#c do
                                         n = n + 1
@@ -795,7 +806,7 @@ function readers.getcomponents(fontdata) -- handy for resolving ligatures when n
                                     end
                                     for j=i+1,#v do
                                         n = n + 1
-                                        t[n] = t[j]
+                                        t[n] = v[j]
                                     end
                                     collected[k] = t
                                     break