diff options
Diffstat (limited to 'src/fontloader')
| -rw-r--r-- | src/fontloader/misc/fontloader-fonts-inj.lua | 1152 | ||||
| -rw-r--r-- | src/fontloader/misc/fontloader-fonts-otn.lua | 3848 |
2 files changed, 0 insertions, 5000 deletions
diff --git a/src/fontloader/misc/fontloader-fonts-inj.lua b/src/fontloader/misc/fontloader-fonts-inj.lua deleted file mode 100644 index 36781f7..0000000 --- a/src/fontloader/misc/fontloader-fonts-inj.lua +++ /dev/null @@ -1,1152 +0,0 @@ -if not modules then modules = { } end modules ['font-inj'] = { - version = 1.001, - comment = "companion to font-lib.mkiv", - author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", - copyright = "PRAGMA ADE / ConTeXt Development Team", - license = "see context related readme files", -} - --- This property based variant is not faster but looks nicer than the attribute one. We --- need to use rawget (which is apbout 4 times slower than a direct access but we cannot --- get/set that one for our purpose! This version does a bit more with discretionaries --- (and Kai has tested it with his collection of weird fonts.) - --- There is some duplicate code here (especially in the the pre/post/replace branches) but --- we go for speed. We could store a list of glyph and mark nodes when registering but it's --- cleaner to have an identification pass here. Also, I need to keep tracing in mind so --- being too clever here is dangerous. - --- The subtype test is not needed as there will be no (new) properties set, given that we --- reset the properties. - -if not nodes.properties then return end - -local next, rawget = next, rawget -local utfchar = utf.char -local fastcopy = table.fastcopy - -local trace_injections = false trackers.register("fonts.injections", function(v) trace_injections = v end) - -local report_injections = logs.reporter("fonts","injections") - -local attributes, nodes, node = attributes, nodes, node - -fonts = fonts -local fontdata = fonts.hashes.identifiers - -nodes.injections = nodes.injections or { } -local injections = nodes.injections - -local nodecodes = nodes.nodecodes -local glyph_code = nodecodes.glyph -local disc_code = nodecodes.disc -local kern_code = nodecodes.kern - -local nuts = nodes.nuts -local nodepool = nuts.pool - -local newkern = nodepool.kern - -local tonode = nuts.tonode -local tonut = nuts.tonut - -local getfield = nuts.getfield -local setfield = nuts.setfield -local getnext = nuts.getnext -local getprev = nuts.getprev -local getid = nuts.getid -local getfont = nuts.getfont -local getsubtype = nuts.getsubtype -local getchar = nuts.getchar - -local traverse_id = nuts.traverse_id -local insert_node_before = nuts.insert_before -local insert_node_after = nuts.insert_after -local find_tail = nuts.tail - -local properties = nodes.properties.data - -function injections.installnewkern(nk) - newkern = nk or newkern -end - -local nofregisteredkerns = 0 -local nofregisteredpairs = 0 -local nofregisteredmarks = 0 -local nofregisteredcursives = 0 ------ markanchors = { } -- one base can have more marks -local keepregisteredcounts = false - -function injections.keepcounts() - keepregisteredcounts = true -end - -function injections.resetcounts() - nofregisteredkerns = 0 - nofregisteredpairs = 0 - nofregisteredmarks = 0 - nofregisteredcursives = 0 - keepregisteredcounts = false -end - --- We need to make sure that a possible metatable will not kick in unexpectedly. - -function injections.reset(n) - local p = rawget(properties,n) - if p and rawget(p,"injections") then - p.injections = nil - end -end - -function injections.copy(target,source) - local sp = rawget(properties,source) - if sp then - local tp = rawget(properties,target) - local si = rawget(sp,"injections") - if si then - si = fastcopy(si) - if tp then - tp.injections = si - else - propertydata[target] = { - injections = si, - } - end - else - if tp then - tp.injections = nil - end - end - end -end - -function injections.setligaindex(n,index) - local p = rawget(properties,n) - if p then - local i = rawget(p,"injections") - if i then - i.ligaindex = index - else - p.injections = { - ligaindex = index - } - end - else - properties[n] = { - injections = { - ligaindex = index - } - } - end -end - -function injections.getligaindex(n,default) - local p = rawget(properties,n) - if p then - local i = rawget(p,"injections") - if i then - return i.ligaindex or default - end - end - return default -end - -function injections.setcursive(start,nxt,factor,rlmode,exit,entry,tfmstart,tfmnext) -- hm: nuts or nodes - local dx = factor*(exit[1]-entry[1]) - local dy = -factor*(exit[2]-entry[2]) - local ws = tfmstart.width - local wn = tfmnext.width - nofregisteredcursives = nofregisteredcursives + 1 - if rlmode < 0 then - dx = -(dx + wn) - else - dx = dx - ws - end - -- - local p = rawget(properties,start) - if p then - local i = rawget(p,"injections") - if i then - i.cursiveanchor = true - else - p.injections = { - cursiveanchor = true, - } - end - else - properties[start] = { - injections = { - cursiveanchor = true, - }, - } - end - local p = rawget(properties,nxt) - if p then - local i = rawget(p,"injections") - if i then - i.cursivex = dx - i.cursivey = dy - else - p.injections = { - cursivex = dx, - cursivey = dy, - } - end - else - properties[nxt] = { - injections = { - cursivex = dx, - cursivey = dy, - }, - } - end - return dx, dy, nofregisteredcursives -end - -function injections.setpair(current,factor,rlmode,r2lflag,spec,injection) -- r2lflag & tfmchr not used - local x = factor*spec[1] - local y = factor*spec[2] - local w = factor*spec[3] - local h = factor*spec[4] - if x ~= 0 or w ~= 0 or y ~= 0 or h ~= 0 then -- okay? - local yoffset = y - h - local leftkern = x -- both kerns are set in a pair kern compared - local rightkern = w - x -- to normal kerns where we set only leftkern - if leftkern ~= 0 or rightkern ~= 0 or yoffset ~= 0 then - nofregisteredpairs = nofregisteredpairs + 1 - if rlmode and rlmode < 0 then - leftkern, rightkern = rightkern, leftkern - end - if not injection then - injection = "injections" - end - local p = rawget(properties,current) - if p then - local i = rawget(p,injection) - if i then - if leftkern ~= 0 then - i.leftkern = (i.leftkern or 0) + leftkern - end - if rightkern ~= 0 then - i.rightkern = (i.rightkern or 0) + rightkern - end - if yoffset ~= 0 then - i.yoffset = (i.yoffset or 0) + yoffset - end - elseif leftkern ~= 0 or rightkern ~= 0 then - p[injection] = { - leftkern = leftkern, - rightkern = rightkern, - yoffset = yoffset, - } - else - p[injection] = { - yoffset = yoffset, - } - end - elseif leftkern ~= 0 or rightkern ~= 0 then - properties[current] = { - [injection] = { - leftkern = leftkern, - rightkern = rightkern, - yoffset = yoffset, - }, - } - else - properties[current] = { - [injection] = { - yoffset = yoffset, - }, - } - end - return x, y, w, h, nofregisteredpairs - end - end - return x, y, w, h -- no bound -end - --- This needs checking for rl < 0 but it is unlikely that a r2l script uses kernclasses between --- glyphs so we're probably safe (KE has a problematic font where marks interfere with rl < 0 in --- the previous case) - -function injections.setkern(current,factor,rlmode,x,injection) - local dx = factor * x - if dx ~= 0 then - nofregisteredkerns = nofregisteredkerns + 1 - local p = rawget(properties,current) - if not injection then - injection = "injections" - end - if p then - local i = rawget(p,injection) - if i then - i.leftkern = dx + (i.leftkern or 0) - else - p[injection] = { - leftkern = dx, - } - end - else - properties[current] = { - [injection] = { - leftkern = dx, - }, - } - end - return dx, nofregisteredkerns - else - return 0, 0 - end -end - -function injections.setmark(start,base,factor,rlmode,ba,ma,tfmbase,mkmk) -- ba=baseanchor, ma=markanchor - local dx, dy = factor*(ba[1]-ma[1]), factor*(ba[2]-ma[2]) - nofregisteredmarks = nofregisteredmarks + 1 - -- markanchors[nofregisteredmarks] = base - if rlmode >= 0 then - dx = tfmbase.width - dx -- see later commented ox - end - local p = rawget(properties,start) - -- hm, dejavu serif does a sloppy mark2mark before mark2base - if p then - local i = rawget(p,"injections") - if i then - if i.markmark then - -- out of order mkmk: yes or no or option - else - i.markx = dx - i.marky = dy - i.markdir = rlmode or 0 - i.markbase = nofregisteredmarks - i.markbasenode = base - i.markmark = mkmk - end - else - p.injections = { - markx = dx, - marky = dy, - markdir = rlmode or 0, - markbase = nofregisteredmarks, - markbasenode = base, - markmark = mkmk, - } - end - else - properties[start] = { - injections = { - markx = dx, - marky = dy, - markdir = rlmode or 0, - markbase = nofregisteredmarks, - markbasenode = base, - markmark = mkmk, - }, - } - end - return dx, dy, nofregisteredmarks -end - -local function dir(n) - return (n and n<0 and "r-to-l") or (n and n>0 and "l-to-r") or "unset" -end - -local function showchar(n,nested) - local char = getchar(n) - report_injections("%wfont %s, char %U, glyph %c",nested and 2 or 0,getfont(n),char,char) -end - -local function show(n,what,nested,symbol) - if n then - local p = rawget(properties,n) - if p then - local i = rawget(p,what) - if i then - local leftkern = i.leftkern or 0 - local rightkern = i.rightkern or 0 - local yoffset = i.yoffset or 0 - local markx = i.markx or 0 - local marky = i.marky or 0 - local markdir = i.markdir or 0 - local markbase = i.markbase or 0 -- will be markbasenode - local cursivex = i.cursivex or 0 - local cursivey = i.cursivey or 0 - local ligaindex = i.ligaindex or 0 - local margin = nested and 4 or 2 - -- - if rightkern ~= 0 or yoffset ~= 0 then - report_injections("%w%s pair: lx %p, rx %p, dy %p",margin,symbol,leftkern,rightkern,yoffset) - elseif leftkern ~= 0 then - report_injections("%w%s kern: dx %p",margin,symbol,leftkern) - end - if markx ~= 0 or marky ~= 0 or markbase ~= 0 then - report_injections("%w%s mark: dx %p, dy %p, dir %s, base %s",margin,symbol,markx,marky,markdir,markbase ~= 0 and "yes" or "no") - end - if cursivex ~= 0 or cursivey ~= 0 then - report_injections("%w%s curs: dx %p, dy %p",margin,symbol,cursivex,cursivey) - end - if ligaindex ~= 0 then - report_injections("%w%s liga: index %i",margin,symbol,ligaindex) - end - end - end - end -end - -local function showsub(n,what,where) - report_injections("begin subrun: %s",where) - for n in traverse_id(glyph_code,n) do - showchar(n,where) - show(n,what,where," ") - end - report_injections("end subrun") -end - -local function trace(head,where) - report_injections("begin run %s: %s kerns, %s pairs, %s marks and %s cursives registered", - where or "",nofregisteredkerns,nofregisteredpairs,nofregisteredmarks,nofregisteredcursives) - local n = head - while n do - local id = getid(n) - if id == glyph_code then - showchar(n) - show(n,"injections",false," ") - show(n,"preinjections",false,"<") - show(n,"postinjections",false,">") - show(n,"replaceinjections",false,"=") - elseif id == disc_code then - local pre = getfield(n,"pre") - local post = getfield(n,"post") - local replace = getfield(n,"replace") - if pre then - showsub(pre,"preinjections","pre") - end - if post then - showsub(post,"postinjections","post") - end - if replace then - showsub(replace,"replaceinjections","replace") - end - end - n = getnext(n) - end - report_injections("end run") -end - -local function show_result(head) - local current = head - local skipping = false - while current do - local id = getid(current) - if id == glyph_code then - report_injections("char: %C, width %p, xoffset %p, yoffset %p", - getchar(current),getfield(current,"width"),getfield(current,"xoffset"),getfield(current,"yoffset")) - skipping = false - elseif id == kern_code then - report_injections("kern: %p",getfield(current,"kern")) - skipping = false - elseif not skipping then - report_injections() - skipping = true - end - current = getnext(current) - end -end - -local function collect_glyphs(head,offsets) - local glyphs, glyphi, nofglyphs = { }, { }, 0 - local marks, marki, nofmarks = { }, { }, 0 - local nf, tm = nil, nil - local n = head - - local function identify(n,what) - local f = getfont(n) - if f ~= nf then - nf = f - -- other hash in ctx: - tm = fontdata[nf].resources - if tm then - tm = tm.marks - end - end - if tm and tm[getchar(n)] then - nofmarks = nofmarks + 1 - marks[nofmarks] = n - marki[nofmarks] = "injections" - else - nofglyphs = nofglyphs + 1 - glyphs[nofglyphs] = n - glyphi[nofglyphs] = what - end - if offsets then - -- yoffsets can influence curs steps - local p = rawget(properties,n) - if p then - local i = rawget(p,what) - if i then - local yoffset = i.yoffset - if yoffset and yoffset ~= 0 then - setfield(n,"yoffset",yoffset) - end - end - end - end - end - - while n do -- only needed for relevant fonts - local id = getid(n) - if id == glyph_code then - identify(n,"injections") - elseif id == disc_code then - local d = getfield(n,"pre") - if d then - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - identify(n,"preinjections") - end - end - end - local d = getfield(n,"post") - if d then - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - identify(n,"postinjections") - end - end - end - local d = getfield(n,"replace") - if d then - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - identify(n,"replaceinjections") - end - end - end - end - n = getnext(n) - end - - return glyphs, glyphi, nofglyphs, marks, marki, nofmarks -end - -local function inject_marks(marks,marki,nofmarks) - for i=1,nofmarks do - local n = marks[i] - local pn = rawget(properties,n) - if pn then - local ni = marki[i] - local pn = rawget(pn,ni) - if pn then - local p = pn.markbasenode - if p then - local px = getfield(p,"xoffset") - local ox = 0 - local rightkern = nil - local pp = rawget(properties,p) - if pp then - pp = rawget(pp,ni) - if pp then - rightkern = pp.rightkern - end - end - if rightkern then -- x and w ~= 0 - if pn.markdir < 0 then - -- kern(w-x) glyph(p) kern(x) mark(n) - ox = px - pn.markx - rightkern - -- report_injections("r2l case 1: %p",ox) - else - -- kern(x) glyph(p) kern(w-x) mark(n) - -- ox = px - getfield(p,"width") + pn.markx - pp.leftkern - -- - -- According to Kai we don't need to handle leftkern here but I'm - -- pretty sure I've run into a case where it was needed so maybe - -- some day we need something more clever here. - -- - if false then - -- a mark with kerning - local leftkern = pp.leftkern - if leftkern then - ox = px - pn.markx - leftkern - else - ox = px - pn.markx - end - else - ox = px - pn.markx - end - end - else - -- we need to deal with fonts that have marks with width - -- if pn.markdir < 0 then - -- ox = px - pn.markx - -- -- report_injections("r2l case 3: %p",ox) - -- else - -- -- ox = px - getfield(p,"width") + pn.markx - ox = px - pn.markx - -- report_injections("l2r case 3: %p",ox) - -- end - local wn = getfield(n,"width") -- in arial marks have widths - if wn ~= 0 then - -- bad: we should center - -- insert_node_before(head,n,newkern(-wn/2)) - -- insert_node_after(head,n,newkern(-wn/2)) - pn.leftkern = -wn/2 - pn.rightkern = -wn/2 - -- wx[n] = { 0, -wn/2, 0, -wn } - end - -- so far - end - setfield(n,"xoffset",ox) - -- - local py = getfield(p,"yoffset") --- local oy = 0 --- if marks[p] then --- oy = py + pn.marky --- else --- oy = getfield(n,"yoffset") + py + pn.marky --- end - local oy = getfield(n,"yoffset") + py + pn.marky - setfield(n,"yoffset",oy) - else - -- normally this can't happen (only when in trace mode which is a special case anyway) - -- report_injections("missing mark anchor %i",pn.markbase or 0) - end - end - end - end -end - -local function inject_cursives(glyphs,glyphi,nofglyphs) - local cursiveanchor, lastanchor = nil, nil - local minc, maxc, last = 0, 0, nil - for i=1,nofglyphs do - local n = glyphs[i] - local pn = rawget(properties,n) - if pn then - pn = rawget(pn,glyphi[i]) - end - if pn then - local cursivex = pn.cursivex - if cursivex then - if cursiveanchor then - if cursivex ~= 0 then - pn.leftkern = (pn.leftkern or 0) + cursivex - end - if lastanchor then - if maxc == 0 then - minc = lastanchor - end - maxc = lastanchor - properties[cursiveanchor].cursivedy = pn.cursivey - end - last = n - else - maxc = 0 - end - elseif maxc > 0 then - local ny = getfield(n,"yoffset") - for i=maxc,minc,-1 do - local ti = glyphs[i] - ny = ny + properties[ti].cursivedy - setfield(ti,"yoffset",ny) -- why not add ? - end - maxc = 0 - end - if pn.cursiveanchor then - cursiveanchor = n - lastanchor = i - else - cursiveanchor = nil - lastanchor = nil - if maxc > 0 then - local ny = getfield(n,"yoffset") - for i=maxc,minc,-1 do - local ti = glyphs[i] - ny = ny + properties[ti].cursivedy - setfield(ti,"yoffset",ny) -- why not add ? - end - maxc = 0 - end - end - elseif maxc > 0 then - local ny = getfield(n,"yoffset") - for i=maxc,minc,-1 do - local ti = glyphs[i] - ny = ny + properties[ti].cursivedy - setfield(ti,"yoffset",getfield(ti,"yoffset") + ny) -- ? - end - maxc = 0 - cursiveanchor = nil - lastanchor = nil - end - -- if maxc > 0 and not cursiveanchor then - -- local ny = getfield(n,"yoffset") - -- for i=maxc,minc,-1 do - -- local ti = glyphs[i][1] - -- ny = ny + properties[ti].cursivedy - -- setfield(ti,"yoffset",ny) -- why not add ? - -- end - -- maxc = 0 - -- end - end - if last and maxc > 0 then - local ny = getfield(last,"yoffset") - for i=maxc,minc,-1 do - local ti = glyphs[i] - ny = ny + properties[ti].cursivedy - setfield(ti,"yoffset",ny) -- why not add ? - end - end -end - --- G +D-pre G --- D-post+ --- +D-replace+ --- --- G +D-pre +D-pre --- D-post +D-post --- +D-replace +D-replace - -local function inject_kerns(head,glist,ilist,length) -- not complete ! compare with inject_kerns_only (but unlikely disc here) - for i=1,length do - local n = glist[i] - local pn = rawget(properties,n) - if pn then - local dp = nil - local dr = nil - local ni = ilist[i] - local p = nil - if ni == "injections" then - p = getprev(n) - if p then - local id = getid(p) - if id == disc_code then - dp = getfield(p,"post") - dr = getfield(p,"replace") - end - end - end - if dp then - local i = rawget(pn,"postinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - local t = find_tail(dp) - insert_node_after(dp,t,newkern(leftkern)) - setfield(p,"post",dp) -- currently we need to force a tail refresh - end - end - end - if dr then - local i = rawget(pn,"replaceinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - local t = find_tail(dr) - insert_node_after(dr,t,newkern(leftkern)) - setfield(p,"replace",dr) -- currently we need to force a tail refresh - end - end - else - local i = rawget(pn,ni) - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - insert_node_before(head,n,newkern(leftkern)) -- type 0/2 - end - local rightkern = i.rightkern - if rightkern and rightkern ~= 0 then - insert_node_after(head,n,newkern(rightkern)) -- type 0/2 - end - end - end - end - end -end - -local function inject_everything(head,where) - head = tonut(head) - if trace_injections then - trace(head,"everything") - end - local glyphs, glyphi, nofglyphs, marks, marki, nofmarks = collect_glyphs(head,nofregisteredpairs > 0) - if nofglyphs > 0 then - if nofregisteredcursives > 0 then - inject_cursives(glyphs,glyphi,nofglyphs) - end - if nofregisteredmarks > 0 then -- and nofmarks > 0 - inject_marks(marks,marki,nofmarks) - end - inject_kerns(head,glyphs,glyphi,nofglyphs) - end - if nofmarks > 0 then - inject_kerns(head,marks,marki,nofmarks) - end - if keepregisteredcounts then - keepregisteredcounts = false - else - nofregisteredkerns = 0 - nofregisteredpairs = 0 - nofregisteredmarks = 0 - nofregisteredcursives = 0 - end - return tonode(head), true -end - --- G +D-pre G --- D-post+ --- +D-replace+ --- --- G +D-pre +D-pre --- D-post +D-post --- +D-replace +D-replace - -local function inject_kerns_only(head,where) - head = tonut(head) - if trace_injections then - trace(head,"kerns") - end - local n = head - local p = nil -- disc node when non-nil - while n do - local id = getid(n) - if id == glyph_code then - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - if p then - local d = getfield(p,"post") - if d then - local i = rawget(pn,"postinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - local t = find_tail(d) - insert_node_after(d,t,newkern(leftkern)) - setfield(p,"post",d) -- currently we need to force a tail refresh - end - end - end - local d = getfield(p,"replace") - if d then - local i = rawget(pn,"replaceinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - local t = find_tail(d) - insert_node_after(d,t,newkern(leftkern)) - setfield(p,"replace",d) -- currently we need to force a tail refresh - end - end - else - local i = rawget(pn,"injections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - setfield(p,"replace",newkern(leftkern)) - end - end - end - else - -- this is the most common case - local i = rawget(pn,"injections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - head = insert_node_before(head,n,newkern(leftkern)) - end - end - end - end - end - p = nil - elseif id == disc_code then - local d = getfield(n,"pre") - if d then - local h = d - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - local i = rawget(pn,"preinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - h = insert_node_before(h,n,newkern(leftkern)) - end - end - end - else - break - end - end - if h ~= d then - setfield(n,"pre",h) - end - end - local d = getfield(n,"post") - if d then - local h = d - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - local i = rawget(pn,"postinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - h = insert_node_before(h,n,newkern(leftkern)) - end - end - end - else - break - end - end - if h ~= d then - setfield(n,"post",h) - end - end - local d = getfield(n,"replace") - if d then - local h = d - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - local i = rawget(pn,"replaceinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - h = insert_node_before(h,n,newkern(leftkern)) - end - end - end - else - break - end - end - if h ~= d then - setfield(n,"replace",h) - end - end - p = n - else - p = nil - end - n = getnext(n) - end - -- - if keepregisteredcounts then - keepregisteredcounts = false - else - nofregisteredkerns = 0 - end - return tonode(head), true -end - -local function inject_pairs_only(head,where) - head = tonut(head) - if trace_injections then - trace(head,"pairs") - end - local n = head - local p = nil -- disc node when non-nil - while n do - local id = getid(n) - if id == glyph_code then - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - if p then - local d = getfield(p,"post") - if d then - local i = rawget(pn,"postinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - local t = find_tail(d) - insert_node_after(d,t,newkern(leftkern)) - setfield(p,"post",d) -- currently we need to force a tail refresh - end - -- local rightkern = i.rightkern - -- if rightkern and rightkern ~= 0 then - -- insert_node_after(head,n,newkern(rightkern)) - -- n = getnext(n) -- to be checked - -- end - end - end - local d = getfield(p,"replace") - if d then - local i = rawget(pn,"replaceinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - local t = find_tail(d) - insert_node_after(d,t,newkern(leftkern)) - setfield(p,"replace",d) -- currently we need to force a tail refresh - end - -- local rightkern = i.rightkern - -- if rightkern and rightkern ~= 0 then - -- insert_node_after(head,n,newkern(rightkern)) - -- n = getnext(n) -- to be checked - -- end - end - else - local i = rawget(pn,"injections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - setfield(p,"replace",newkern(leftkern)) - end - -- local rightkern = i.rightkern - -- if rightkern and rightkern ~= 0 then - -- insert_node_after(head,n,newkern(rightkern)) - -- n = getnext(n) -- to be checked - -- end - end - end - else - -- this is the most common case - local i = rawget(pn,"injections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - head = insert_node_before(head,n,newkern(leftkern)) - end - local rightkern = i.rightkern - if rightkern and rightkern ~= 0 then - insert_node_after(head,n,newkern(rightkern)) - n = getnext(n) -- to be checked - end - local yoffset = i.yoffset - if yoffset and yoffset ~= 0 then - setfield(n,"yoffset",yoffset) - end - end - end - end - end - p = nil - elseif id == disc_code then - local d = getfield(n,"pre") - if d then - local h = d - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - local i = rawget(pn,"preinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - h = insert_node_before(h,n,newkern(leftkern)) - end - local rightkern = i.rightkern - if rightkern and rightkern ~= 0 then - insert_node_after(head,n,newkern(rightkern)) - n = getnext(n) -- to be checked - end - local yoffset = i.yoffset - if yoffset and yoffset ~= 0 then - setfield(n,"yoffset",yoffset) - end - end - end - else - break - end - end - if h ~= d then - setfield(n,"pre",h) - end - end - local d = getfield(n,"post") - if d then - local h = d - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - local i = rawget(pn,"postinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - h = insert_node_before(h,n,newkern(leftkern)) - end - local rightkern = i.rightkern - if rightkern and rightkern ~= 0 then - insert_node_after(head,n,newkern(rightkern)) - n = getnext(n) -- to be checked - end - local yoffset = i.yoffset - if yoffset and yoffset ~= 0 then - setfield(n,"yoffset",yoffset) - end - end - end - else - break - end - end - if h ~= d then - setfield(n,"post",h) - end - end - local d = getfield(n,"replace") - if d then - local h = d - for n in traverse_id(glyph_code,d) do - if getsubtype(n) < 256 then - local pn = rawget(properties,n) - if pn then - local i = rawget(pn,"replaceinjections") - if i then - local leftkern = i.leftkern - if leftkern and leftkern ~= 0 then - h = insert_node_before(h,n,newkern(leftkern)) - end - local rightkern = i.rightkern - if rightkern and rightkern ~= 0 then - insert_node_after(head,n,newkern(rightkern)) - n = getnext(n) -- to be checked - end - local yoffset = i.yoffset - if yoffset and yoffset ~= 0 then - setfield(n,"yoffset",yoffset) - end - end - end - else - break - end - end - if h ~= d then - setfield(n,"replace",h) - end - end - p = n - else - p = nil - end - n = getnext(n) - end - -- - if keepregisteredcounts then - keepregisteredcounts = false - else - nofregisteredpairs = 0 - nofregisteredkerns = 0 - end - return tonode(head), true -end - -function injections.handler(head,where) - if nofregisteredmarks > 0 or nofregisteredcursives > 0 then - return inject_everything(head,where) - elseif nofregisteredpairs > 0 then - return inject_pairs_only(head,where) - elseif nofregisteredkerns > 0 then - return inject_kerns_only(head,where) - else - return head, false - end -end diff --git a/src/fontloader/misc/fontloader-fonts-otn.lua b/src/fontloader/misc/fontloader-fonts-otn.lua deleted file mode 100644 index 7fafadb..0000000 --- a/src/fontloader/misc/fontloader-fonts-otn.lua +++ /dev/null @@ -1,3848 +0,0 @@ -if not modules then modules = { } end modules ['font-otn'] = { - version = 1.001, - comment = "companion to font-ini.mkiv", - author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", - copyright = "PRAGMA ADE / ConTeXt Development Team", - license = "see context related readme files", -} - --- this is a context version which can contain experimental code, but when we --- have serious patches we also need to change the other two font-otn files - --- at some point i might decide to convert the whole list into a table and then --- run over that instead (but it has some drawbacks as we also need to deal with --- attributes and such so we need to keep a lot of track - which is why i rejected --- that method - although it has become a bit easier in the meantime so it might --- become an alternative (by that time i probably have gone completely lua) .. the --- usual chicken-egg issues ... maybe mkix as it's no real tex any more then - --- preprocessors = { "nodes" } - --- anchor class : mark, mkmk, curs, mklg (todo) --- anchor type : mark, basechar, baselig, basemark, centry, cexit, max (todo) - --- this is still somewhat preliminary and it will get better in due time; --- much functionality could only be implemented thanks to the husayni font --- of Idris Samawi Hamid to who we dedicate this module. - --- in retrospect it always looks easy but believe it or not, it took a lot --- of work to get proper open type support done: buggy fonts, fuzzy specs, --- special made testfonts, many skype sessions between taco, idris and me, --- torture tests etc etc ... unfortunately the code does not show how much --- time it took ... - --- todo: --- --- extension infrastructure (for usage out of context) --- sorting features according to vendors/renderers --- alternative loop quitters --- check cursive and r2l --- find out where ignore-mark-classes went --- default features (per language, script) --- handle positions (we need example fonts) --- handle gpos_single (we might want an extra width field in glyph nodes because adding kerns might interfere) --- mark (to mark) code is still not what it should be (too messy but we need some more extreem husayni tests) --- remove some optimizations (when I have a faster machine) --- --- beware: --- --- we do some disc jugling where we need to keep in mind that the --- pre, post and replace fields can have prev pointers to a nesting --- node ... i wonder if that is still needed --- --- not possible: --- --- \discretionary {alpha-} {betagammadelta} --- {\discretionary {alphabeta-} {gammadelta} --- {\discretionary {alphabetagamma-} {delta} --- {alphabetagammadelta}}} - ---[[ldx-- -<p>This module is a bit more split up that I'd like but since we also want to test -with plain <l n='tex'/> it has to be so. This module is part of <l n='context'/> -and discussion about improvements and functionality mostly happens on the -<l n='context'/> mailing list.</p> - -<p>The specification of OpenType is kind of vague. Apart from a lack of a proper -free specifications there's also the problem that Microsoft and Adobe -may have their own interpretation of how and in what order to apply features. -In general the Microsoft website has more detailed specifications and is a -better reference. There is also some information in the FontForge help files.</p> - -<p>Because there is so much possible, fonts might contain bugs and/or be made to -work with certain rederers. These may evolve over time which may have the side -effect that suddenly fonts behave differently.</p> - -<p>After a lot of experiments (mostly by Taco, me and Idris) we're now at yet another -implementation. Of course all errors are mine and of course the code can be -improved. There are quite some optimizations going on here and processing speed -is currently acceptable. Not all functions are implemented yet, often because I -lack the fonts for testing. Many scripts are not yet supported either, but I will -look into them as soon as <l n='context'/> users ask for it.</p> - -<p>The specification leaves room for interpretation. In case of doubt the microsoft -implementation is the reference as it is the most complete one. As they deal with -lots of scripts and fonts, Kai and Ivo did a lot of testing of the generic code and -their suggestions help improve the code. I'm aware that not all border cases can be -taken care of, unless we accept excessive runtime, and even then the interference -with other mechanisms (like hyphenation) are not trivial.</p> - -<p>Glyphs are indexed not by unicode but in their own way. This is because there is no -relationship with unicode at all, apart from the fact that a font might cover certain -ranges of characters. One character can have multiple shapes. However, at the -<l n='tex'/> end we use unicode so and all extra glyphs are mapped into a private -space. This is needed because we need to access them and <l n='tex'/> has to include -then in the output eventually.</p> - -<p>The raw table as it coms from <l n='fontforge'/> gets reorganized in to fit out needs. -In <l n='context'/> that table is packed (similar tables are shared) and cached on disk -so that successive runs can use the optimized table (after loading the table is -unpacked). The flattening code used later is a prelude to an even more compact table -format (and as such it keeps evolving).</p> - -<p>This module is sparsely documented because it is a moving target. The table format -of the reader changes and we experiment a lot with different methods for supporting -features.</p> - -<p>As with the <l n='afm'/> code, we may decide to store more information in the -<l n='otf'/> table.</p> - -<p>Incrementing the version number will force a re-cache. We jump the number by one -when there's a fix in the <l n='fontforge'/> library or <l n='lua'/> code that -results in different tables.</p> ---ldx]]-- - --- action handler chainproc --- --- gsub_single ok ok --- gsub_multiple ok ok --- gsub_alternate ok ok --- gsub_ligature ok ok --- gsub_context ok -- --- gsub_contextchain ok -- --- gsub_reversecontextchain ok -- --- chainsub -- ok --- reversesub -- ok --- gpos_mark2base ok ok --- gpos_mark2ligature ok ok --- gpos_mark2mark ok ok --- gpos_cursive ok untested --- gpos_single ok ok --- gpos_pair ok ok --- gpos_context ok -- --- gpos_contextchain ok -- --- --- todo: contextpos and contextsub and class stuff --- --- actions: --- --- handler : actions triggered by lookup --- chainproc : actions triggered by contextual lookup --- chainmore : multiple substitutions triggered by contextual lookup (e.g. fij -> f + ij) --- --- remark: the 'not implemented yet' variants will be done when we have fonts that use them - --- We used to have independent hashes for lookups but as the tags are unique --- we now use only one hash. If needed we can have multiple again but in that --- case I will probably prefix (i.e. rename) the lookups in the cached font file. - --- Todo: make plugin feature that operates on char/glyphnode arrays - -local type, next, tonumber = type, next, tonumber -local random = math.random -local formatters = string.formatters - -local logs, trackers, nodes, attributes = logs, trackers, nodes, attributes - -local registertracker = trackers.register -local registerdirective = directives.register - -local fonts = fonts -local otf = fonts.handlers.otf - -local trace_lookups = false registertracker("otf.lookups", function(v) trace_lookups = v end) -local trace_singles = false registertracker("otf.singles", function(v) trace_singles = v end) -local trace_multiples = false registertracker("otf.multiples", function(v) trace_multiples = v end) -local trace_alternatives = false registertracker("otf.alternatives", function(v) trace_alternatives = v end) -local trace_ligatures = false registertracker("otf.ligatures", function(v) trace_ligatures = v end) -local trace_contexts = false registertracker("otf.contexts", function(v) trace_contexts = v end) -local trace_marks = false registertracker("otf.marks", function(v) trace_marks = v end) -local trace_kerns = false registertracker("otf.kerns", function(v) trace_kerns = v end) -local trace_cursive = false registertracker("otf.cursive", function(v) trace_cursive = v end) -local trace_preparing = false registertracker("otf.preparing", function(v) trace_preparing = v end) -local trace_bugs = false registertracker("otf.bugs", function(v) trace_bugs = v end) -local trace_details = false registertracker("otf.details", function(v) trace_details = v end) -local trace_applied = false registertracker("otf.applied", function(v) trace_applied = v end) -local trace_steps = false registertracker("otf.steps", function(v) trace_steps = v end) -local trace_skips = false registertracker("otf.skips", function(v) trace_skips = v end) -local trace_directions = false registertracker("otf.directions", function(v) trace_directions = v end) - -local trace_kernruns = false registertracker("otf.kernruns", function(v) trace_kernruns = v end) -local trace_discruns = false registertracker("otf.discruns", function(v) trace_discruns = v end) -local trace_compruns = false registertracker("otf.compruns", function(v) trace_compruns = v end) - -local quit_on_no_replacement = true -- maybe per font -local zwnjruns = true - -registerdirective("otf.zwnjruns", function(v) zwnjruns = v end) -registerdirective("otf.chain.quitonnoreplacement",function(value) quit_on_no_replacement = value end) - -local report_direct = logs.reporter("fonts","otf direct") -local report_subchain = logs.reporter("fonts","otf subchain") -local report_chain = logs.reporter("fonts","otf chain") -local report_process = logs.reporter("fonts","otf process") -local report_prepare = logs.reporter("fonts","otf prepare") -local report_warning = logs.reporter("fonts","otf warning") -local report_run = logs.reporter("fonts","otf run") - -registertracker("otf.verbose_chain", function(v) otf.setcontextchain(v and "verbose") end) -registertracker("otf.normal_chain", function(v) otf.setcontextchain(v and "normal") end) - -registertracker("otf.replacements", "otf.singles,otf.multiples,otf.alternatives,otf.ligatures") -registertracker("otf.positions","otf.marks,otf.kerns,otf.cursive") -registertracker("otf.actions","otf.replacements,otf.positions") -registertracker("otf.injections","nodes.injections") - -registertracker("*otf.sample","otf.steps,otf.actions,otf.analyzing") - -local nuts = nodes.nuts -local tonode = nuts.tonode -local tonut = nuts.tonut - -local getfield = nuts.getfield -local setfield = nuts.setfield -local getnext = nuts.getnext -local getprev = nuts.getprev -local getid = nuts.getid -local getattr = nuts.getattr -local setattr = nuts.setattr -local getprop = nuts.getprop -local setprop = nuts.setprop -local getfont = nuts.getfont -local getsubtype = nuts.getsubtype -local getchar = nuts.getchar - -local insert_node_before = nuts.insert_before -local insert_node_after = nuts.insert_after -local delete_node = nuts.delete -local remove_node = nuts.remove -local copy_node = nuts.copy -local copy_node_list = nuts.copy_list -local find_node_tail = nuts.tail -local flush_node_list = nuts.flush_list -local free_node = nuts.free -local end_of_math = nuts.end_of_math -local traverse_nodes = nuts.traverse -local traverse_id = nuts.traverse_id - -local setmetatableindex = table.setmetatableindex - -local zwnj = 0x200C -local zwj = 0x200D -local wildcard = "*" -local default = "dflt" - -local nodecodes = nodes.nodecodes -local whatcodes = nodes.whatcodes -local glyphcodes = nodes.glyphcodes -local disccodes = nodes.disccodes - -local glyph_code = nodecodes.glyph -local glue_code = nodecodes.glue -local disc_code = nodecodes.disc -local math_code = nodecodes.math - -local dir_code = whatcodes.dir -local localpar_code = whatcodes.localpar -local discretionary_code = disccodes.discretionary -local ligature_code = glyphcodes.ligature - -local privateattribute = attributes.private - --- Something is messed up: we have two mark / ligature indices, one at the injection --- end and one here ... this is based on KE's patches but there is something fishy --- there as I'm pretty sure that for husayni we need some connection (as it's much --- more complex than an average font) but I need proper examples of all cases, not --- of only some. - -local a_state = privateattribute('state') -local a_cursbase = privateattribute('cursbase') -- to be checked, probably can go - -local injections = nodes.injections -local setmark = injections.setmark -local setcursive = injections.setcursive -local setkern = injections.setkern -local setpair = injections.setpair -local resetinjection = injections.reset -local copyinjection = injections.copy -local setligaindex = injections.setligaindex -local getligaindex = injections.getligaindex - -local cursonce = true - -local fonthashes = fonts.hashes -local fontdata = fonthashes.identifiers - -local otffeatures = fonts.constructors.newfeatures("otf") -local registerotffeature = otffeatures.register - -local onetimemessage = fonts.loggers.onetimemessage or function() end - -otf.defaultnodealternate = "none" -- first last - --- we share some vars here, after all, we have no nested lookups and less code - -local tfmdata = false -local characters = false -local descriptions = false -local resources = false -local marks = false -local currentfont = false -local lookuptable = false -local anchorlookups = false -local lookuptypes = false -local lookuptags = false -local handlers = { } -local rlmode = 0 -local featurevalue = false - -local sweephead = { } -local sweepnode = nil -local sweepprev = nil -local sweepnext = nil - -local notmatchpre = { } -local notmatchpost = { } -local notmatchreplace = { } - --- we use this for special testing and documentation - -local checkstep = (nodes and nodes.tracers and nodes.tracers.steppers.check) or function() end -local registerstep = (nodes and nodes.tracers and nodes.tracers.steppers.register) or function() end -local registermessage = (nodes and nodes.tracers and nodes.tracers.steppers.message) or function() end - -local function logprocess(...) - if trace_steps then - registermessage(...) - end - report_direct(...) -end - -local function logwarning(...) - report_direct(...) -end - -local f_unicode = formatters["%U"] -local f_uniname = formatters["%U (%s)"] -local f_unilist = formatters["% t (% t)"] - -local function gref(n) -- currently the same as in font-otb - if type(n) == "number" then - local description = descriptions[n] - local name = description and description.name - if name then - return f_uniname(n,name) - else - return f_unicode(n) - end - elseif n then - local num, nam = { }, { } - for i=1,#n do - local ni = n[i] - if tonumber(ni) then -- later we will start at 2 - local di = descriptions[ni] - num[i] = f_unicode(ni) - nam[i] = di and di.name or "-" - end - end - return f_unilist(num,nam) - else - return "<error in node mode tracing>" - end -end - -local function cref(kind,chainname,chainlookupname,lookupname,index) -- not in the mood to alias f_ - if index then - return formatters["feature %a, chain %a, sub %a, lookup %a, index %a"](kind,chainname,chainlookupname,lookuptags[lookupname],index) - elseif lookupname then - return formatters["feature %a, chain %a, sub %a, lookup %a"](kind,chainname,chainlookupname,lookuptags[lookupname]) - elseif chainlookupname then - return formatters["feature %a, chain %a, sub %a"](kind,lookuptags[chainname],lookuptags[chainlookupname]) - elseif chainname then - return formatters["feature %a, chain %a"](kind,lookuptags[chainname]) - else - return formatters["feature %a"](kind) - end -end - -local function pref(kind,lookupname) - return formatters["feature %a, lookup %a"](kind,lookuptags[lookupname]) -end - --- We can assume that languages that use marks are not hyphenated. We can also assume --- that at most one discretionary is present. - --- We do need components in funny kerning mode but maybe I can better reconstruct then --- as we do have the font components info available; removing components makes the --- previous code much simpler. Also, later on copying and freeing becomes easier. --- However, for arabic we need to keep them around for the sake of mark placement --- and indices. - -local function copy_glyph(g) -- next and prev are untouched ! - local components = getfield(g,"components") - if components then - setfield(g,"components",nil) - local n = copy_node(g) - copyinjection(n,g) -- we need to preserve the lig indices - setfield(g,"components",components) - return n - else - local n = copy_node(g) - copyinjection(n,g) -- we need to preserve the lig indices - return n - end -end - -local function flattendisk(head,disc) - local replace = getfield(disc,"replace") - setfield(disc,"replace",nil) - free_node(disc) - if head == disc then - local next = getnext(disc) - if replace then - if next then - local tail = find_node_tail(replace) - setfield(tail,"next",next) - setfield(next,"prev",tail) - end - return replace, replace - elseif next then - return next, next - else - return -- maybe warning - end - else - local next = getnext(disc) - local prev = getprev(disc) - if replace then - local tail = find_node_tail(replace) - if next then - setfield(tail,"next",next) - setfield(next,"prev",tail) - end - setfield(prev,"next",replace) - setfield(replace,"prev",prev) - return head, replace - else - if next then - setfield(next,"prev",prev) - end - setfield(prev,"next",next) - return head, next - end - end -end - -local function appenddisc(disc,list) - local post = getfield(disc,"post") - local replace = getfield(disc,"replace") - local phead = list - local rhead = copy_node_list(list) - local ptail = find_node_tail(post) - local rtail = find_node_tail(replace) - if post then - setfield(ptail,"next",phead) - setfield(phead,"prev",ptail) - else - setfield(disc,"post",phead) - end - if replace then - setfield(rtail,"next",rhead) - setfield(rhead,"prev",rtail) - else - setfield(disc,"replace",rhead) - end -end - --- start is a mark and we need to keep that one - -local function markstoligature(kind,lookupname,head,start,stop,char) - if start == stop and getchar(start) == char then - return head, start - else - local prev = getprev(start) - local next = getnext(stop) - setfield(start,"prev",nil) - setfield(stop,"next",nil) - local base = copy_glyph(start) - if head == start then - head = base - end - resetinjection(base) - setfield(base,"char",char) - setfield(base,"subtype",ligature_code) - setfield(base,"components",start) - if prev then - setfield(prev,"next",base) - end - if next then - setfield(next,"prev",base) - end - setfield(base,"next",next) - setfield(base,"prev",prev) - return head, base - end -end - --- The next code is somewhat complicated by the fact that some fonts can have ligatures made --- from ligatures that themselves have marks. This was identified by Kai in for instance --- arabtype: KAF LAM SHADDA ALEF FATHA (0x0643 0x0644 0x0651 0x0627 0x064E). This becomes --- KAF LAM-ALEF with a SHADDA on the first and a FATHA op de second component. In a next --- iteration this becomes a KAF-LAM-ALEF with a SHADDA on the second and a FATHA on the --- third component. - -local function getcomponentindex(start) -- we could store this offset in the glyph (nofcomponents) - if getid(start) ~= glyph_code then -- and then get rid of all components - return 0 - elseif getsubtype(start) == ligature_code then - local i = 0 - local components = getfield(start,"components") - while components do - i = i + getcomponentindex(components) - components = getnext(components) - end - return i - elseif not marks[getchar(start)] then - return 1 - else - return 0 - end -end - -local a_noligature = attributes.private("noligature") - -local function toligature(kind,lookupname,head,start,stop,char,markflag,discfound) -- brr head - if getattr(start,a_noligature) == 1 then - -- so we can do: e\noligature{ff}e e\noligature{f}fie (we only look at the first) - return head, start - end - if start == stop and getchar(start) == char then - resetinjection(start) - setfield(start,"char",char) - return head, start - end - -- needs testing (side effects): - local components = getfield(start,"components") - if components then - -- we get a double free .. needs checking - -- flush_node_list(components) - end - -- - local prev = getprev(start) - local next = getnext(stop) - local comp = start - setfield(start,"prev",nil) - setfield(stop,"next",nil) - local base = copy_glyph(start) - if start == head then - head = base - end - resetinjection(base) - setfield(base,"char",char) - setfield(base,"subtype",ligature_code) - setfield(base,"components",comp) -- start can have components ... do we need to flush? - if prev then - setfield(prev,"next",base) - end - if next then - setfield(next,"prev",base) - end - setfield(base,"prev",prev) - setfield(base,"next",next) - if not discfound then - local deletemarks = markflag ~= "mark" - local components = start - local baseindex = 0 - local componentindex = 0 - local head = base - local current = base - -- first we loop over the glyphs in start .. stop - while start do - local char = getchar(start) - if not marks[char] then - baseindex = baseindex + componentindex - componentindex = getcomponentindex(start) - elseif not deletemarks then -- quite fishy - setligaindex(start,baseindex + getligaindex(start,componentindex)) - if trace_marks then - logwarning("%s: keep mark %s, gets index %s",pref(kind,lookupname),gref(char),getligaindex(start)) - end - local n = copy_node(start) - copyinjection(n,start) - head, current = insert_node_after(head,current,n) -- unlikely that mark has components - elseif trace_marks then - logwarning("%s: delete mark %s",pref(kind,lookupname),gref(char)) - end - start = getnext(start) - end - -- we can have one accent as part of a lookup and another following - -- local start = components -- was wrong (component scanning was introduced when more complex ligs in devanagari was added) - local start = getnext(current) - while start and getid(start) == glyph_code do - local char = getchar(start) - if marks[char] then - setligaindex(start,baseindex + getligaindex(start,componentindex)) - if trace_marks then - logwarning("%s: set mark %s, gets index %s",pref(kind,lookupname),gref(char),getligaindex(start)) - end - else - break - end - start = getnext(start) - end - else - -- discfound ... forget about marks .. probably no scripts that hyphenate and have marks - local discprev = getfield(discfound,"prev") - local discnext = getfield(discfound,"next") - if discprev and discnext then - -- we assume normalization in context, and don't care about generic ... especially - -- \- can give problems as there we can have a negative char but that won't match - -- anyway - local pre = getfield(discfound,"pre") - local post = getfield(discfound,"post") - local replace = getfield(discfound,"replace") - if not replace then -- todo: signal simple hyphen - local prev = getfield(base,"prev") - local copied = copy_node_list(comp) - setfield(discnext,"prev",nil) -- also blocks funny assignments - setfield(discprev,"next",nil) -- also blocks funny assignments - if pre then - setfield(discprev,"next",pre) - setfield(pre,"prev",discprev) - end - pre = comp - if post then - local tail = find_node_tail(post) - setfield(tail,"next",discnext) - setfield(discnext,"prev",tail) - setfield(post,"prev",nil) - else - post = discnext - end - setfield(prev,"next",discfound) - setfield(discfound,"prev",prev) - setfield(discfound,"next",next) - setfield(next,"prev",discfound) - setfield(base,"next",nil) - setfield(base,"prev",nil) - setfield(base,"components",copied) - setfield(discfound,"pre",pre) - setfield(discfound,"post",post) - setfield(discfound,"replace",base) - setfield(discfound,"subtype",discretionary_code) - base = prev -- restart - end - end - end - return head, base -end - -local function multiple_glyphs(head,start,multiple,ignoremarks) - local nofmultiples = #multiple - if nofmultiples > 0 then - resetinjection(start) - setfield(start,"char",multiple[1]) - if nofmultiples > 1 then - local sn = getnext(start) - for k=2,nofmultiples do -- todo: use insert_node --- untested: --- --- while ignoremarks and marks[getchar(sn)] then --- local sn = getnext(sn) --- end - local n = copy_node(start) -- ignore components - resetinjection(n) - setfield(n,"char",multiple[k]) - setfield(n,"prev",start) - setfield(n,"next",sn) - if sn then - setfield(sn,"prev",n) - end - setfield(start,"next",n) - start = n - end - end - return head, start, true - else - if trace_multiples then - logprocess("no multiple for %s",gref(getchar(start))) - end - return head, start, false - end -end - -local function get_alternative_glyph(start,alternatives,value,trace_alternatives) - local n = #alternatives - if value == "random" then - local r = random(1,n) - return alternatives[r], trace_alternatives and formatters["value %a, taking %a"](value,r) - elseif value == "first" then - return alternatives[1], trace_alternatives and formatters["value %a, taking %a"](value,1) - elseif value == "last" then - return alternatives[n], trace_alternatives and formatters["value %a, taking %a"](value,n) - else - value = tonumber(value) - if type(value) ~= "number" then - return alternatives[1], trace_alternatives and formatters["invalid value %s, taking %a"](value,1) - elseif value > n then - local defaultalt = otf.defaultnodealternate - if defaultalt == "first" then - return alternatives[n], trace_alternatives and formatters["invalid value %s, taking %a"](value,1) - elseif defaultalt == "last" then - return alternatives[1], trace_alternatives and formatters["invalid value %s, taking %a"](value,n) - else - return false, trace_alternatives and formatters["invalid value %a, %s"](value,"out of range") - end - elseif value == 0 then - return getchar(start), trace_alternatives and formatters["invalid value %a, %s"](value,"no change") - elseif value < 1 then - return alternatives[1], trace_alternatives and formatters["invalid value %a, taking %a"](value,1) - else - return alternatives[value], trace_alternatives and formatters["value %a, taking %a"](value,value) - end - end -end - --- handlers - -function handlers.gsub_single(head,start,kind,lookupname,replacement) - if trace_singles then - logprocess("%s: replacing %s by single %s",pref(kind,lookupname),gref(getchar(start)),gref(replacement)) - end - resetinjection(start) - setfield(start,"char",replacement) - return head, start, true -end - -function handlers.gsub_alternate(head,start,kind,lookupname,alternative,sequence) - local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue - local choice, comment = get_alternative_glyph(start,alternative,value,trace_alternatives) - if choice then - if trace_alternatives then - logprocess("%s: replacing %s by alternative %a to %s, %s",pref(kind,lookupname),gref(getchar(start)),choice,gref(choice),comment) - end - resetinjection(start) - setfield(start,"char",choice) - else - if trace_alternatives then - logwarning("%s: no variant %a for %s, %s",pref(kind,lookupname),value,gref(getchar(start)),comment) - end - end - return head, start, true -end - -function handlers.gsub_multiple(head,start,kind,lookupname,multiple,sequence) - if trace_multiples then - logprocess("%s: replacing %s by multiple %s",pref(kind,lookupname),gref(getchar(start)),gref(multiple)) - end - return multiple_glyphs(head,start,multiple,sequence.flags[1]) -end - -function handlers.gsub_ligature(head,start,kind,lookupname,ligature,sequence) - local s, stop = getnext(start), nil - local startchar = getchar(start) - if marks[startchar] then - while s do - local id = getid(s) - if id == glyph_code and getfont(s) == currentfont and getsubtype(s)<256 then - local lg = ligature[getchar(s)] - if lg then - stop = s - ligature = lg - s = getnext(s) - else - break - end - else - break - end - end - if stop then - local lig = ligature.ligature - if lig then - if trace_ligatures then - local stopchar = getchar(stop) - head, start = markstoligature(kind,lookupname,head,start,stop,lig) - logprocess("%s: replacing %s upto %s by ligature %s case 1",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(getchar(start))) - else - head, start = markstoligature(kind,lookupname,head,start,stop,lig) - end - return head, start, true, false - else - -- ok, goto next lookup - end - end - else - local skipmark = sequence.flags[1] - local discfound = false - local lastdisc = nil - while s do - local id = getid(s) - if id == glyph_code and getsubtype(s)<256 then -- not needed - if getfont(s) == currentfont then -- also not needed only when mark - local char = getchar(s) - if skipmark and marks[char] then - s = getnext(s) - else -- ligature is a tree - local lg = ligature[char] -- can there be multiple in a row? maybe in a bad font - if lg then - if not discfound and lastdisc then - discfound = lastdisc - lastdisc = nil - end - stop = s -- needed for fake so outside then - ligature = lg - s = getnext(s) - else - break - end - end - else - break - end - elseif id == disc_code then - lastdisc = s - s = getnext(s) - else - break - end - end - local lig = ligature.ligature -- can't we get rid of this .ligature? - if lig then - if stop then - if trace_ligatures then - local stopchar = getchar(stop) - head, start = toligature(kind,lookupname,head,start,stop,lig,skipmark,discfound) - logprocess("%s: replacing %s upto %s by ligature %s case 2",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(getchar(start))) - else - head, start = toligature(kind,lookupname,head,start,stop,lig,skipmark,discfound) - end - else - -- weird but happens (in some arabic font) - resetinjection(start) - setfield(start,"char",lig) - if trace_ligatures then - logprocess("%s: replacing %s by (no real) ligature %s case 3",pref(kind,lookupname),gref(startchar),gref(lig)) - end - end - return head, start, true, discfound - else - -- weird but happens, pseudo ligatures ... just the components - end - end - return head, start, false, discfound -end - -function handlers.gpos_single(head,start,kind,lookupname,kerns,sequence,injection) - local startchar = getchar(start) - local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns,injection) -- ,characters[startchar]) - if trace_kerns then - logprocess("%s: shifting single %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),dx,dy,w,h) - end - return head, start, false -end - -function handlers.gpos_pair(head,start,kind,lookupname,kerns,sequence,lookuphash,i,injection) - -- todo: kerns in disc nodes: pre, post, replace -> loop over disc too - -- todo: kerns in components of ligatures - local snext = getnext(start) - if not snext then - return head, start, false - else - local prev = start - local done = false - local factor = tfmdata.parameters.factor - local lookuptype = lookuptypes[lookupname] - while snext and getid(snext) == glyph_code and getfont(snext) == currentfont and getsubtype(snext)<256 do - local nextchar = getchar(snext) - local krn = kerns[nextchar] - if not krn and marks[nextchar] then - prev = snext - snext = getnext(snext) - else - if not krn then - -- skip - elseif type(krn) == "table" then - if lookuptype == "pair" then -- probably not needed - local a, b = krn[2], krn[3] - if a and #a > 0 then - local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a,injection) -- characters[startchar]) - if trace_kerns then - local startchar = getchar(start) - logprocess("%s: shifting first of pair %s and %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h) - end - end - if b and #b > 0 then - local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b,injection) -- characters[nextchar]) - if trace_kerns then - local startchar = getchar(start) - logprocess("%s: shifting second of pair %s and %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h) - end - end - else -- wrong ... position has different entries - report_process("%s: check this out (old kern stuff)",pref(kind,lookupname)) - -- local a, b = krn[2], krn[6] - -- if a and a ~= 0 then - -- local k = setkern(snext,factor,rlmode,a) - -- if trace_kerns then - -- logprocess("%s: inserting first kern %s between %s and %s",pref(kind,lookupname),k,gref(getchar(prev)),gref(nextchar)) - -- end - -- end - -- if b and b ~= 0 then - -- logwarning("%s: ignoring second kern xoff %s",pref(kind,lookupname),b*factor) - -- end - end - done = true - elseif krn ~= 0 then - local k = setkern(snext,factor,rlmode,krn,injection) - if trace_kerns then - logprocess("%s: inserting kern %s between %s and %s",pref(kind,lookupname),k,gref(getchar(prev)),gref(nextchar)) -- prev? - end - done = true - end - break - end - end - return head, start, done - end -end - ---[[ldx-- -<p>We get hits on a mark, but we're not sure if the it has to be applied so -we need to explicitly test for basechar, baselig and basemark entries.</p> ---ldx]]-- - -function handlers.gpos_mark2base(head,start,kind,lookupname,markanchors,sequence) - local markchar = getchar(start) - if marks[markchar] then - local base = getprev(start) -- [glyph] [start=mark] - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - local basechar = getchar(base) - if marks[basechar] then - while true do - base = getprev(base) - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - basechar = getchar(base) - if not marks[basechar] then - break - end - else - if trace_bugs then - logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar)) - end - return head, start, false - end - end - end - local baseanchors = descriptions[basechar] - if baseanchors then - baseanchors = baseanchors.anchors - end - if baseanchors then - local baseanchors = baseanchors['basechar'] - if baseanchors then - local al = anchorlookups[lookupname] - for anchor,ba in next, baseanchors do - if al[anchor] then - local ma = markanchors[anchor] - if ma then - local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar]) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%p,%p)", - pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return head, start, true - end - end - end - if trace_bugs then - logwarning("%s, no matching anchors for mark %s and base %s",pref(kind,lookupname),gref(markchar),gref(basechar)) - end - end - elseif trace_bugs then - -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar)) - onetimemessage(currentfont,basechar,"no base anchors",report_fonts) - end - elseif trace_bugs then - logwarning("%s: prev node is no char",pref(kind,lookupname)) - end - elseif trace_bugs then - logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar)) - end - return head, start, false -end - -function handlers.gpos_mark2ligature(head,start,kind,lookupname,markanchors,sequence) - -- check chainpos variant - local markchar = getchar(start) - if marks[markchar] then - local base = getprev(start) -- [glyph] [optional marks] [start=mark] - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - local basechar = getchar(base) - if marks[basechar] then - while true do - base = getprev(base) - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - basechar = getchar(base) - if not marks[basechar] then - break - end - else - if trace_bugs then - logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar)) - end - return head, start, false - end - end - end - local index = getligaindex(start) - local baseanchors = descriptions[basechar] - if baseanchors then - baseanchors = baseanchors.anchors - if baseanchors then - local baseanchors = baseanchors['baselig'] - if baseanchors then - local al = anchorlookups[lookupname] - for anchor, ba in next, baseanchors do - if al[anchor] then - local ma = markanchors[anchor] - if ma then - ba = ba[index] - if ba then - local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar]) -- index - if trace_marks then - logprocess("%s, anchor %s, index %s, bound %s: anchoring mark %s to baselig %s at index %s => (%p,%p)", - pref(kind,lookupname),anchor,index,bound,gref(markchar),gref(basechar),index,dx,dy) - end - return head, start, true - else - if trace_bugs then - logwarning("%s: no matching anchors for mark %s and baselig %s with index %a",pref(kind,lookupname),gref(markchar),gref(basechar),index) - end - end - end - end - end - if trace_bugs then - logwarning("%s: no matching anchors for mark %s and baselig %s",pref(kind,lookupname),gref(markchar),gref(basechar)) - end - end - end - elseif trace_bugs then - -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar)) - onetimemessage(currentfont,basechar,"no base anchors",report_fonts) - end - elseif trace_bugs then - logwarning("%s: prev node is no char",pref(kind,lookupname)) - end - elseif trace_bugs then - logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar)) - end - return head, start, false -end - -function handlers.gpos_mark2mark(head,start,kind,lookupname,markanchors,sequence) - local markchar = getchar(start) - if marks[markchar] then - local base = getprev(start) -- [glyph] [basemark] [start=mark] - local slc = getligaindex(start) - if slc then -- a rather messy loop ... needs checking with husayni - while base do - local blc = getligaindex(base) - if blc and blc ~= slc then - base = getprev(base) - else - break - end - end - end - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then -- subtype test can go - local basechar = getchar(base) - local baseanchors = descriptions[basechar] - if baseanchors then - baseanchors = baseanchors.anchors - if baseanchors then - baseanchors = baseanchors['basemark'] - if baseanchors then - local al = anchorlookups[lookupname] - for anchor,ba in next, baseanchors do - if al[anchor] then - local ma = markanchors[anchor] - if ma then - local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar],true) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%p,%p)", - pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return head, start, true - end - end - end - if trace_bugs then - logwarning("%s: no matching anchors for mark %s and basemark %s",pref(kind,lookupname),gref(markchar),gref(basechar)) - end - end - end - elseif trace_bugs then - -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar)) - onetimemessage(currentfont,basechar,"no base anchors",report_fonts) - end - elseif trace_bugs then - logwarning("%s: prev node is no mark",pref(kind,lookupname)) - end - elseif trace_bugs then - logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar)) - end - return head, start, false -end - -function handlers.gpos_cursive(head,start,kind,lookupname,exitanchors,sequence) -- to be checked - local alreadydone = cursonce and getprop(start,a_cursbase) - if not alreadydone then - local done = false - local startchar = getchar(start) - if marks[startchar] then - if trace_cursive then - logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar)) - end - else - local nxt = getnext(start) - while not done and nxt and getid(nxt) == glyph_code and getfont(nxt) == currentfont and getsubtype(nxt)<256 do - local nextchar = getchar(nxt) - if marks[nextchar] then - -- should not happen (maybe warning) - nxt = getnext(nxt) - else - local entryanchors = descriptions[nextchar] - if entryanchors then - entryanchors = entryanchors.anchors - if entryanchors then - entryanchors = entryanchors['centry'] - if entryanchors then - local al = anchorlookups[lookupname] - for anchor, entry in next, entryanchors do - if al[anchor] then - local exit = exitanchors[anchor] - if exit then - local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar]) - if trace_cursive then - logprocess("%s: moving %s to %s cursive (%p,%p) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode) - end - done = true - break - end - end - end - end - end - elseif trace_bugs then - -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar)) - onetimemessage(currentfont,startchar,"no entry anchors",report_fonts) - end - break - end - end - end - return head, start, done - else - if trace_cursive and trace_details then - logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(getchar(start)),alreadydone) - end - return head, start, false - end -end - ---[[ldx-- -<p>I will implement multiple chain replacements once I run into a font that uses -it. It's not that complex to handle.</p> ---ldx]]-- - -local chainprocs = { } - -local function logprocess(...) - if trace_steps then - registermessage(...) - end - report_subchain(...) -end - -local logwarning = report_subchain - -local function logprocess(...) - if trace_steps then - registermessage(...) - end - report_chain(...) -end - -local logwarning = report_chain - --- We could share functions but that would lead to extra function calls with many --- arguments, redundant tests and confusing messages. - -function chainprocs.chainsub(head,start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname) - logwarning("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname)) - return head, 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. - -function chainprocs.reversesub(head,start,stop,kind,chainname,currentcontext,lookuphash,replacements) - local char = getchar(start) - local replacement = replacements[char] - if replacement then - if trace_singles then - logprocess("%s: single reverse replacement of %s by %s",cref(kind,chainname),gref(char),gref(replacement)) - end - resetinjection(start) - setfield(start,"char",replacement) - return head, start, true - else - return head, start, false - end -end - ---[[ldx-- -<p>This chain stuff is somewhat tricky since we can have a sequence of actions to be -applied: single, alternate, multiple or ligature where ligature can be an invalid -one in the sense that it will replace multiple by one but not neccessary one that -looks like the combination (i.e. it is the counterpart of multiple then). For -example, the following is valid:</p> - -<typing> -<line>xxxabcdexxx [single a->A][multiple b->BCD][ligature cde->E] xxxABCDExxx</line> -</typing> - -<p>Therefore we we don't really do the replacement here already unless we have the -single lookup case. The efficiency of the replacements can be improved by deleting -as less as needed but that would also make the code even more messy.</p> ---ldx]]-- - --- local function delete_till_stop(head,start,stop,ignoremarks) -- keeps start --- local n = 1 --- if start == stop then --- -- done --- elseif ignoremarks then --- repeat -- start x x m x x stop => start m --- local next = getnext(start) --- if not marks[getchar(next)] then --- local components = getfield(next,"components") --- if components then -- probably not needed --- flush_node_list(components) --- end --- head = delete_node(head,next) --- end --- n = n + 1 --- until next == stop --- else -- start x x x stop => start --- repeat --- local next = getnext(start) --- local components = getfield(next,"components") --- if components then -- probably not needed --- flush_node_list(components) --- end --- head = delete_node(head,next) --- n = n + 1 --- until next == stop --- end --- return head, n --- end - ---[[ldx-- -<p>Here we replace start by a single variant.</p> ---ldx]]-- - -function chainprocs.gsub_single(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex) - -- todo: marks ? - local current = start - local subtables = currentlookup.subtables - if #subtables > 1 then - logwarning("todo: check if we need to loop over the replacements: % t",subtables) - end - while current do - if getid(current) == glyph_code then - local currentchar = getchar(current) - local lookupname = subtables[1] -- only 1 - local replacement = lookuphash[lookupname] - if not replacement then - if trace_bugs then - logwarning("%s: no single hits",cref(kind,chainname,chainlookupname,lookupname,chainindex)) - end - else - replacement = replacement[currentchar] - if not replacement or replacement == "" then - if trace_bugs then - logwarning("%s: no single for %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar)) - end - else - if trace_singles then - logprocess("%s: replacing single %s by %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar),gref(replacement)) - end - resetinjection(current) - setfield(current,"char",replacement) - end - end - return head, start, true - elseif current == stop then - break - else - current = getnext(current) - end - end - return head, start, false -end - ---[[ldx-- -<p>Here we replace start by a sequence of new glyphs.</p> ---ldx]]-- - -function chainprocs.gsub_multiple(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - -- local head, n = delete_till_stop(head,start,stop) - local startchar = getchar(start) - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local replacements = lookuphash[lookupname] - if not replacements then - if trace_bugs then - logwarning("%s: no multiple hits",cref(kind,chainname,chainlookupname,lookupname)) - end - else - replacements = replacements[startchar] - if not replacements or replacement == "" then - if trace_bugs then - logwarning("%s: no multiple for %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar)) - end - else - if trace_multiples then - logprocess("%s: replacing %s by multiple characters %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar),gref(replacements)) - end - return multiple_glyphs(head,start,replacements,currentlookup.flags[1]) - end - end - return head, start, false -end - ---[[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(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local current = start - local subtables = currentlookup.subtables - local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue - while current do - if getid(current) == glyph_code then -- is this check needed? - local currentchar = getchar(current) - local lookupname = subtables[1] - local alternatives = lookuphash[lookupname] - if not alternatives then - if trace_bugs then - logwarning("%s: no alternative hit",cref(kind,chainname,chainlookupname,lookupname)) - end - else - alternatives = alternatives[currentchar] - if alternatives then - local choice, comment = get_alternative_glyph(current,alternatives,value,trace_alternatives) - if choice then - if trace_alternatives then - logprocess("%s: replacing %s by alternative %a to %s, %s",cref(kind,chainname,chainlookupname,lookupname),gref(char),choice,gref(choice),comment) - end - resetinjection(start) - setfield(start,"char",choice) - else - if trace_alternatives then - logwarning("%s: no variant %a for %s, %s",cref(kind,chainname,chainlookupname,lookupname),value,gref(char),comment) - end - end - elseif trace_bugs then - logwarning("%s: no alternative for %s, %s",cref(kind,chainname,chainlookupname,lookupname),gref(currentchar),comment) - end - end - return head, start, true - elseif current == stop then - break - else - current = getnext(current) - end - end - return head, start, false -end - ---[[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 -assume rather stupid ligatures (no complex disc nodes).</p> ---ldx]]-- - -function chainprocs.gsub_ligature(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex) - local startchar = getchar(start) - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local ligatures = lookuphash[lookupname] - if not ligatures then - if trace_bugs then - logwarning("%s: no ligature hits",cref(kind,chainname,chainlookupname,lookupname,chainindex)) - end - else - ligatures = ligatures[startchar] - if not ligatures then - if trace_bugs then - logwarning("%s: no ligatures starting with %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar)) - end - else - local s = getnext(start) - local discfound = false - local last = stop - local nofreplacements = 1 - local skipmark = currentlookup.flags[1] - while s do - local id = getid(s) - if id == disc_code then - if not discfound then - discfound = s - end - if s == stop then - break -- okay? or before the disc - else - s = getnext(s) - end - else - local schar = getchar(s) - if skipmark and marks[schar] then -- marks - s = getnext(s) - else - local lg = ligatures[schar] - if lg then - ligatures, last, nofreplacements = lg, s, nofreplacements + 1 - if s == stop then - break - else - s = getnext(s) - end - else - break - end - end - end - end - local l2 = ligatures.ligature - if l2 then - if chainindex then - stop = last - end - if trace_ligatures then - if start == stop then - logprocess("%s: replacing character %s by ligature %s case 3",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(l2)) - else - logprocess("%s: replacing character %s upto %s by ligature %s case 4",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(getchar(stop)),gref(l2)) - end - end - head, start = toligature(kind,lookupname,head,start,stop,l2,currentlookup.flags[1],discfound) - return head, start, true, nofreplacements, discfound - elseif trace_bugs then - if start == stop then - logwarning("%s: replacing character %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar)) - else - logwarning("%s: replacing character %s upto %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(getchar(stop))) - end - end - end - end - return head, start, false, 0, false -end - -function chainprocs.gpos_single(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence) - -- untested .. needs checking for the new model - local startchar = getchar(start) - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local kerns = lookuphash[lookupname] - if kerns then - kerns = kerns[startchar] -- needed ? - if kerns then - local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns) -- ,characters[startchar]) - if trace_kerns then - logprocess("%s: shifting single %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),dx,dy,w,h) - end - end - end - return head, start, false -end - -function chainprocs.gpos_pair(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence) - local snext = getnext(start) - if snext then - local startchar = getchar(start) - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local kerns = lookuphash[lookupname] - if kerns then - kerns = kerns[startchar] - if kerns then - local lookuptype = lookuptypes[lookupname] - local prev, done = start, false - local factor = tfmdata.parameters.factor - while snext and getid(snext) == glyph_code and getfont(snext) == currentfont and getsubtype(snext)<256 do - local nextchar = getchar(snext) - local krn = kerns[nextchar] - if not krn and marks[nextchar] then - prev = snext - snext = getnext(snext) - else - if not krn then - -- skip - elseif type(krn) == "table" then - if lookuptype == "pair" then - local a, b = krn[2], krn[3] - if a and #a > 0 then - local startchar = getchar(start) - local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a) -- ,characters[startchar]) - if trace_kerns then - logprocess("%s: shifting first of pair %s and %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h) - end - end - if b and #b > 0 then - local startchar = getchar(start) - local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b) -- ,characters[nextchar]) - if trace_kerns then - logprocess("%s: shifting second of pair %s and %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h) - end - end - else - report_process("%s: check this out (old kern stuff)",cref(kind,chainname,chainlookupname)) - -- local a, b = krn[2], krn[6] - -- if a and a ~= 0 then - -- local k = setkern(snext,factor,rlmode,a) - -- if trace_kerns then - -- logprocess("%s: inserting first kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(getchar(prev)),gref(nextchar)) - -- end - -- end - -- if b and b ~= 0 then - -- logwarning("%s: ignoring second kern xoff %s",cref(kind,chainname,chainlookupname),b*factor) - -- end - end - done = true - elseif krn ~= 0 then - local k = setkern(snext,factor,rlmode,krn) - if trace_kerns then - logprocess("%s: inserting kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(getchar(prev)),gref(nextchar)) - end - done = true - end - break - end - end - return head, start, done - end - end - end - return head, start, false -end - -function chainprocs.gpos_mark2base(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local markchar = getchar(start) - if marks[markchar] then - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local markanchors = lookuphash[lookupname] - if markanchors then - markanchors = markanchors[markchar] - end - if markanchors then - local base = getprev(start) -- [glyph] [start=mark] - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - local basechar = getchar(base) - if marks[basechar] then - while true do - base = getprev(base) - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - basechar = getchar(base) - if not marks[basechar] then - break - end - else - if trace_bugs then - logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar)) - end - return head, start, false - end - end - end - local baseanchors = descriptions[basechar].anchors - if baseanchors then - local baseanchors = baseanchors['basechar'] - if baseanchors then - local al = anchorlookups[lookupname] - for anchor,ba in next, baseanchors do - if al[anchor] then - local ma = markanchors[anchor] - if ma then - local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar]) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%p,%p)", - cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return head, start, true - end - end - end - if trace_bugs then - logwarning("%s, no matching anchors for mark %s and base %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar)) - end - end - end - elseif trace_bugs then - logwarning("%s: prev node is no char",cref(kind,chainname,chainlookupname,lookupname)) - end - elseif trace_bugs then - logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar)) - end - elseif trace_bugs then - logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar)) - end - return head, start, false -end - -function chainprocs.gpos_mark2ligature(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local markchar = getchar(start) - if marks[markchar] then - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local markanchors = lookuphash[lookupname] - if markanchors then - markanchors = markanchors[markchar] - end - if markanchors then - local base = getprev(start) -- [glyph] [optional marks] [start=mark] - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - local basechar = getchar(base) - if marks[basechar] then - while true do - base = getprev(base) - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then - basechar = getchar(base) - if not marks[basechar] then - break - end - else - if trace_bugs then - logwarning("%s: no base for mark %s",cref(kind,chainname,chainlookupname,lookupname),markchar) - end - return head, start, false - end - end - end - -- todo: like marks a ligatures hash - local index = getligaindex(start) - local baseanchors = descriptions[basechar].anchors - if baseanchors then - local baseanchors = baseanchors['baselig'] - if baseanchors then - local al = anchorlookups[lookupname] - for anchor,ba in next, baseanchors do - if al[anchor] then - local ma = markanchors[anchor] - if ma then - ba = ba[index] - if ba then - local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar]) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to baselig %s at index %s => (%p,%p)", - cref(kind,chainname,chainlookupname,lookupname),anchor,a or bound,gref(markchar),gref(basechar),index,dx,dy) - end - return head, start, true - end - end - end - end - if trace_bugs then - logwarning("%s: no matching anchors for mark %s and baselig %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar)) - end - end - end - elseif trace_bugs then - logwarning("feature %s, lookup %s: prev node is no char",kind,lookupname) - end - elseif trace_bugs then - logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar)) - end - elseif trace_bugs then - logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar)) - end - return head, start, false -end - -function chainprocs.gpos_mark2mark(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local markchar = getchar(start) - if marks[markchar] then - -- local markanchors = descriptions[markchar].anchors markanchors = markanchors and markanchors.mark - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local markanchors = lookuphash[lookupname] - if markanchors then - markanchors = markanchors[markchar] - end - if markanchors then - local base = getprev(start) -- [glyph] [basemark] [start=mark] - local slc = getligaindex(start) - if slc then -- a rather messy loop ... needs checking with husayni - while base do - local blc = getligaindex(base) - if blc and blc ~= slc then - base = getprev(base) - else - break - end - end - end - if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then -- subtype test can go - local basechar = getchar(base) - local baseanchors = descriptions[basechar].anchors - if baseanchors then - baseanchors = baseanchors['basemark'] - if baseanchors then - local al = anchorlookups[lookupname] - for anchor,ba in next, baseanchors do - if al[anchor] then - local ma = markanchors[anchor] - if ma then - local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar],true) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%p,%p)", - cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return head, start, true - end - end - end - if trace_bugs then - logwarning("%s: no matching anchors for mark %s and basemark %s",gref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar)) - end - end - end - elseif trace_bugs then - logwarning("%s: prev node is no mark",cref(kind,chainname,chainlookupname,lookupname)) - end - elseif trace_bugs then - logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar)) - end - elseif trace_bugs then - logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar)) - end - return head, start, false -end - -function chainprocs.gpos_cursive(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local alreadydone = cursonce and getprop(start,a_cursbase) - if not alreadydone then - local startchar = getchar(start) - local subtables = currentlookup.subtables - local lookupname = subtables[1] - local exitanchors = lookuphash[lookupname] - if exitanchors then - exitanchors = exitanchors[startchar] - end - if exitanchors then - local done = false - if marks[startchar] then - if trace_cursive then - logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar)) - end - else - local nxt = getnext(start) - while not done and nxt and getid(nxt) == glyph_code and getfont(nxt) == currentfont and getsubtype(nxt)<256 do - local nextchar = getchar(nxt) - if marks[nextchar] then - -- should not happen (maybe warning) - nxt = getnext(nxt) - else - local entryanchors = descriptions[nextchar] - if entryanchors then - entryanchors = entryanchors.anchors - if entryanchors then - entryanchors = entryanchors['centry'] - if entryanchors then - local al = anchorlookups[lookupname] - for anchor, entry in next, entryanchors do - if al[anchor] then - local exit = exitanchors[anchor] - if exit then - local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar]) - if trace_cursive then - logprocess("%s: moving %s to %s cursive (%p,%p) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode) - end - done = true - break - end - end - end - end - end - elseif trace_bugs then - -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar)) - onetimemessage(currentfont,startchar,"no entry anchors",report_fonts) - end - break - end - end - end - return head, start, done - else - if trace_cursive and trace_details then - logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(getchar(start)),alreadydone) - end - return head, start, false - end - end - return head, start, false -end - --- what pointer to return, spec says stop --- to be discussed ... is bidi changer a space? --- elseif char == zwnj and sequence[n][32] then -- brrr - --- somehow l or f is global --- we don't need to pass the currentcontext, saves a bit --- make a slow variant then can be activated but with more tracing - -local function show_skip(kind,chainname,char,ck,class) - if ck[9] then - logwarning("%s: skipping char %s, class %a, rule %a, lookuptype %a, %a => %a",cref(kind,chainname),gref(char),class,ck[1],ck[2],ck[9],ck[10]) - else - logwarning("%s: skipping char %s, class %a, rule %a, lookuptype %a",cref(kind,chainname),gref(char),class,ck[1],ck[2]) - end -end - --- A previous version had disc collapsing code in the (single sub) handler plus some --- checking in the main loop, but that left the pre/post sequences undone. The best --- solution is to add some checking there and backtrack when a replace/post matches --- but it takes a bit of work to figure out an efficient way (this is what the sweep* --- names refer to). I might look into that variant one day again as it can replace --- some other code too. In that approach we can have a special version for gub and pos --- which gains some speed. This method does the test and passes info to the handlers --- (sweepnode, sweepmode, sweepprev, sweepnext, etc). Here collapsing is handled in the --- main loop which also makes code elsewhere simpler (i.e. no need for the other special --- runners and disc code in ligature building). I also experimented with pushing preceding --- glyphs sequences in the replace/pre fields beforehand which saves checking afterwards --- but at the cost of duplicate glyphs (memory) but it's too much overhead (runtime). --- --- In the meantime Kai had moved the code from the single chain into a more general handler --- and this one (renamed to chaindisk) is used now. I optimized the code a bit and brought --- it in sycn with the other code. Hopefully I didn't introduce errors. Note: this somewhat --- complex approach is meant for fonts that implement (for instance) ligatures by character --- replacement which to some extend is not that suitable for hyphenation. I also use some --- helpers. This method passes some states but reparses the list. There is room for a bit of --- speed up but that will be done in the context version. (In fact a partial rewrite of all --- code can bring some more efficientry.) --- --- I didn't test it with extremes but successive disc nodes still can give issues but in --- order to handle that we need more complex code which also slows down even more. The main --- loop variant could deal with that: test, collapse, backtrack. - -local function chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,chainindex,sequence,chainproc) - - if not start then - return head, start, false - end - - local startishead = start == head - local seq = ck[3] - local f = ck[4] - local l = ck[5] - local s = #seq - local done = false - local sweepnode = sweepnode - local sweeptype = sweeptype - local sweepoverflow = false - local checkdisc = getprev(head) -- hm bad name head - local keepdisc = not sweepnode - local lookaheaddisc = nil - local backtrackdisc = nil - local current = start - local last = start - local prev = getprev(start) - - -- fishy: so we can overflow and then go on in the sweep? - - local i = f - while i <= l do - local id = getid(current) - if id == glyph_code then - i = i + 1 - last = current - current = getnext(current) - elseif id == disc_code then - if keepdisc then - keepdisc = false - if notmatchpre[current] ~= notmatchreplace[current] then - lookaheaddisc = current - end - local replace = getfield(current,"replace") - while replace and i <= l do - if getid(replace) == glyph_code then - i = i + 1 - end - replace = getnext(replace) - end - last = current - current = getnext(c) - else - head, current = flattendisk(head,current) - end - else - last = current - current = getnext(current) - end - if current then - -- go on - elseif sweepoverflow then - -- we already are folling up on sweepnode - break - elseif sweeptype == "post" or sweeptype == "replace" then - current = getnext(sweepnode) - if current then - sweeptype = nil - sweepoverflow = true - else - break - end - end - end - - if sweepoverflow then - local prev = current and getprev(current) - if not current or prev ~= sweepnode then - local head = getnext(sweepnode) - local tail = nil - if prev then - tail = prev - setfield(current,"prev",sweepnode) - else - tail = find_node_tail(head) - end - setfield(sweepnode,"next",current) - setfield(head,"prev",nil) - setfield(tail,"next",nil) - appenddisc(sweepnode,head) - end - end - - if l < s then - local i = l - local t = sweeptype == "post" or sweeptype == "replace" - while current and i < s do - local id = getid(current) - if id == glyph_code then - i = i + 1 - current = getnext(current) - elseif id == disc_code then - if keepdisc then - keepdisc = false - if notmatchpre[current] ~= notmatchreplace[current] then - lookaheaddisc = current - end - local replace = getfield(c,"replace") - while replace and i < s do - if getid(replace) == glyph_code then - i = i + 1 - end - replace = getnext(replace) - end - current = getnext(current) - elseif notmatchpre[current] ~= notmatchreplace[current] then - head, current = flattendisk(head,current) - else - current = getnext(current) -- HH - end - else - current = getnext(current) - end - if not current and t then - current = getnext(sweepnode) - if current then - sweeptype = nil - end - end - end - end - - if f > 1 then - local current = prev - local i = f - local t = sweeptype == "pre" or sweeptype == "replace" - if not current and t and current == checkdisk then - current = getprev(sweepnode) - end - while current and i > 1 do -- missing getprev added / moved outside - local id = getid(current) - if id == glyph_code then - i = i - 1 - elseif id == disc_code then - if keepdisc then - keepdisc = false - if notmatchpost[current] ~= notmatchreplace[current] then - backtrackdisc = current - end - local replace = getfield(current,"replace") - while replace and i > 1 do - if getid(replace) == glyph_code then - i = i - 1 - end - replace = getnext(replace) - end - elseif notmatchpost[current] ~= notmatchreplace[current] then - head, current = flattendisk(head,current) - end - end - current = getprev(current) - if t and current == checkdisk then - current = getprev(sweepnode) - end - end - end - - local ok = false - if lookaheaddisc then - - local cf = start - local cl = getprev(lookaheaddisc) - local cprev = getprev(start) - local insertedmarks = 0 - - while cprev and getid(cf) == glyph_code and getfont(cf) == currentfont and getsubtype(cf) < 256 and marks[getchar(cf)] do - insertedmarks = insertedmarks + 1 - cf = cprev - startishead = cf == head - cprev = getprev(cprev) - end - - setfield(lookaheaddisc,"prev",cprev) - if cprev then - setfield(cprev,"next",lookaheaddisc) - end - setfield(cf,"prev",nil) - setfield(cl,"next",nil) - if startishead then - head = lookaheaddisc - end - - local replace = getfield(lookaheaddisc,"replace") - local pre = getfield(lookaheaddisc,"pre") - local new = copy_node_list(cf) - local cnew = new - for i=1,insertedmarks do - cnew = getnext(cnew) - end - local clast = cnew - for i=f,l do - clast = getnext(clast) - end - if not notmatchpre[lookaheaddisc] then - cf, start, ok = chainproc(cf,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence) - end - if not notmatchreplace[lookaheaddisc] then - new, cnew, ok = chainproc(new,cnew,clast,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence) - end - if pre then - setfield(cl,"next",pre) - setfield(pre,"prev",cl) - end - if replace then - local tail = find_node_tail(new) - setfield(tail,"next",replace) - setfield(replace,"prev",tail) - end - setfield(lookaheaddisc,"pre",cf) -- also updates tail - setfield(lookaheaddisc,"replace",new) -- also updates tail - - start = getprev(lookaheaddisc) - sweephead[cf] = getnext(clast) - sweephead[new] = getnext(last) - - elseif backtrackdisc then - - local cf = getnext(backtrackdisc) - local cl = start - local cnext = getnext(start) - local insertedmarks = 0 - - while cnext and getid(cnext) == glyph_code and getfont(cnext) == currentfont and getsubtype(cnext) < 256 and marks[getchar(cnext)] do - insertedmarks = insertedmarks + 1 - cl = cnext - cnext = getnext(cnext) - end - if cnext then - setfield(cnext,"prev",backtrackdisc) - end - setfield(backtrackdisc,"next",cnext) - setfield(cf,"prev",nil) - setfield(cl,"next",nil) - local replace = getfield(backtrackdisc,"replace") - local post = getfield(backtrackdisc,"post") - local new = copy_node_list(cf) - local cnew = find_node_tail(new) - for i=1,insertedmarks do - cnew = getprev(cnew) - end - local clast = cnew - for i=f,l do - clast = getnext(clast) - end - if not notmatchpost[backtrackdisc] then - cf, start, ok = chainproc(cf,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence) - end - if not notmatchreplace[backtrackdisc] then - new, cnew, ok = chainproc(new,cnew,clast,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence) - end - if post then - local tail = find_node_tail(post) - setfield(tail,"next",cf) - setfield(cf,"prev",tail) - else - post = cf - end - if replace then - local tail = find_node_tail(replace) - setfield(tail,"next",new) - setfield(new,"prev",tail) - else - replace = new - end - setfield(backtrackdisc,"post",post) -- also updates tail - setfield(backtrackdisc,"replace",replace) -- also updates tail - start = getprev(backtrackdisc) - sweephead[post] = getnext(clast) - sweephead[replace] = getnext(last) - - else - - head, start, ok = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence) - - end - - return head, start, ok -end - -local function normal_handle_contextchain(head,start,kind,chainname,contexts,sequence,lookuphash) - local sweepnode = sweepnode - local sweeptype = sweeptype - local diskseen = false - local checkdisc = getprev(head) - local flags = sequence.flags - local done = false - local skipmark = flags[1] - local skipligature = flags[2] - local skipbase = flags[3] - local markclass = sequence.markclass - local skipped = false - - for k=1,#contexts do -- i've only seen ccmp having > 1 (e.g. dejavu) - local match = true - local current = start - local last = start - local ck = contexts[k] - local seq = ck[3] - local s = #seq - -- f..l = mid string - if s == 1 then - -- never happens - match = getid(current) == glyph_code and getfont(current) == currentfont and getsubtype(current)<256 and seq[1][getchar(current)] - else - -- maybe we need a better space check (maybe check for glue or category or combination) - -- we cannot optimize for n=2 because there can be disc nodes - local f = ck[4] - local l = ck[5] - -- current match - if f == 1 and f == l then -- current only - -- already a hit - -- match = true - else -- before/current/after | before/current | current/after - -- no need to test first hit (to be optimized) - if f == l then -- new, else last out of sync (f is > 1) - -- match = true - else - local discfound = nil - local n = f + 1 - last = getnext(last) - while n <= l do - if not last and (sweeptype == "post" or sweeptype == "replace") then - last = getnext(sweepnode) - sweeptype = nil - end - if last then - local id = getid(last) - if id == glyph_code then - if getfont(last) == currentfont and getsubtype(last)<256 then - local char = getchar(last) - local ccd = descriptions[char] - if ccd then - local class = ccd.class or "base" - if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then - skipped = true - if trace_skips then - show_skip(kind,chainname,char,ck,class) - end - last = getnext(last) - elseif seq[n][char] then - if n < l then - last = getnext(last) - end - n = n + 1 - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpre[discfound] - else - match = false - end - break - end - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpre[discfound] - else - match = false - end - break - end - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpre[discfound] - else - match = false - end - break - end - elseif id == disc_code then - diskseen = true - discfound = last - notmatchpre[last] = nil - notmatchpost[last] = true - notmatchreplace[last] = nil - local pre = getfield(last,"pre") - local replace = getfield(last,"replace") - if pre then - local n = n - while pre do - if seq[n][getchar(pre)] then - n = n + 1 - pre = getnext(pre) - if n > l then - break - end - else - notmatchpre[last] = true - break - end - end - if n <= l then - notmatchpre[last] = true - end - else - notmatchpre[last] = true - end - if replace then - -- so far we never entered this branch - while replace do - if seq[n][getchar(replace)] then - n = n + 1 - replace = getnext(replace) - if n > l then - break - end - else - notmatchreplace[last] = true - match = not notmatchpre[last] - break - end - end - match = not notmatchpre[last] - end - last = getnext(last) - else - match = false - break - end - else - match = false - break - end - end - end - end - -- before - if match and f > 1 then - local prev = getprev(start) - if prev then - if prev == checkdisc and (sweeptype == "pre" or sweeptype == "replace") then - prev = getprev(sweepnode) - -- sweeptype = nil - end - if prev then - local discfound = nil - local n = f - 1 - while n >= 1 do - if prev then - local id = getid(prev) - if id == glyph_code then - if getfont(prev) == currentfont and getsubtype(prev)<256 then -- normal char - local char = getchar(prev) - local ccd = descriptions[char] - if ccd then - local class = ccd.class - if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then - skipped = true - if trace_skips then - show_skip(kind,chainname,char,ck,class) - end - elseif seq[n][char] then - n = n -1 - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpost[discfound] - else - match = false - end - break - end - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpost[discfound] - else - match = false - end - break - end - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpost[discfound] - else - match = false - end - break - end - elseif id == disc_code then - -- the special case: f i where i becomes dottless i .. - diskseen = true - discfound = prev - notmatchpre[prev] = true - notmatchpost[prev] = nil - notmatchreplace[prev] = nil - local pre = getfield(prev,"pre") - local post = getfield(prev,"post") - local replace = getfield(prev,"replace") - if pre ~= start and post ~= start and replace ~= start then - if post then - local n = n - local posttail = find_node_tail(post) - while posttail do - if seq[n][getchar(posttail)] then - n = n - 1 - if posttail == post then - break - else - posttail = getprev(posttail) - if n < 1 then - break - end - end - else - notmatchpost[prev] = true - break - end - end - if n >= 1 then - notmatchpost[prev] = true - end - else - notmatchpost[prev] = true - end - if replace then - -- we seldom enter this branch (e.g. on brill efficient) - local replacetail = find_node_tail(replace) - while replacetail do - if seq[n][getchar(replacetail)] then - n = n - 1 - if replacetail == replace then - break - else - replacetail = getprev(replacetail) - if n < 1 then - break - end - end - else - notmatchreplace[prev] = true - match = not notmatchpost[prev] - break - end - end - if not match then - break - end - else - -- skip 'm - end - else - -- skip 'm - end - elseif seq[n][32] then - n = n -1 - else - match = false - break - end - prev = getprev(prev) - elseif seq[n][32] then -- somewhat special, as zapfino can have many preceding spaces - n = n - 1 - else - match = false - break - end - end - else - match = false - end - else - match = false - end - end - -- after - if match and s > l then - local current = last and getnext(last) - if not current then - if sweeptype == "post" or sweeptype == "replace" then - current = getnext(sweepnode) - -- sweeptype = nil - end - end - if current then - local discfound = nil - -- removed optimization for s-l == 1, we have to deal with marks anyway - local n = l + 1 - while n <= s do - if current then - local id = getid(current) - if id == glyph_code then - if getfont(current) == currentfont and getsubtype(current)<256 then -- normal char - local char = getchar(current) - local ccd = descriptions[char] - if ccd then - local class = ccd.class - if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then - skipped = true - if trace_skips then - show_skip(kind,chainname,char,ck,class) - end - elseif seq[n][char] then - n = n + 1 - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpre[discfound] - else - match = false - end - break - end - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpre[discfound] - else - match = false - end - break - end - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpre[discfound] - else - match = false - end - break - end - elseif id == disc_code then - diskseen = true - discfound = current - notmatchpre[current] = nil - notmatchpost[current] = true - notmatchreplace[current] = nil - local pre = getfield(current,"pre") - local replace = getfield(current,"replace") - if pre then - local n = n - while pre do - if seq[n][getchar(pre)] then - n = n + 1 - pre = getnext(pre) - if n > s then - break - end - else - notmatchpre[current] = true - break - end - end - if n <= s then - notmatchpre[current] = true - end - else - notmatchpre[current] = true - end - if replace then - -- so far we never entered this branch - while replace do - if seq[n][getchar(replace)] then - n = n + 1 - replace = getnext(replace) - if n > s then - break - end - else - notmatchreplace[current] = true - match = notmatchpre[current] - break - end - end - if not match then - break - end - else - -- skip 'm - end - elseif seq[n][32] then -- brrr - n = n + 1 - else - match = false - break - end - current = getnext(current) - elseif seq[n][32] then - n = n + 1 - else - match = false - break - end - end - else - match = false - end - end - end - if match then - -- can lookups be of a different type ? - local diskchain = diskseen or sweepnode - if trace_contexts then - local rule, lookuptype, f, l = ck[1], ck[2], ck[4], ck[5] - local char = getchar(start) - if ck[9] then - logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %a, %a => %a", - cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype,ck[9],ck[10]) - else - logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %a", - cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype) - end - end - local chainlookups = ck[6] - if chainlookups then - local nofchainlookups = #chainlookups - -- we can speed this up if needed - if nofchainlookups == 1 then - local chainlookupname = chainlookups[1] - local chainlookup = lookuptable[chainlookupname] - if chainlookup then - local chainproc = chainprocs[chainlookup.type] - if chainproc then - local ok - if diskchain then - head, start, ok = chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence,chainproc) - else - head, start, ok = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence) - end - if ok then - done = true - end - else - logprocess("%s: %s is not yet supported",cref(kind,chainname,chainlookupname),chainlookup.type) - end - else -- shouldn't happen - logprocess("%s is not yet supported",cref(kind,chainname,chainlookupname)) - end - else - local i = 1 - while start and true do - if skipped then - while true do -- todo: use properties - local char = getchar(start) - local ccd = descriptions[char] - if ccd then - local class = ccd.class or "base" - if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then - start = getnext(start) - else - break - end - else - break - end - end - end - -- see remark in ms standard under : LookupType 5: Contextual Substitution Subtable - local chainlookupname = chainlookups[i] - local chainlookup = lookuptable[chainlookupname] - if not chainlookup then - -- we just advance - i = i + 1 - else - local chainproc = chainprocs[chainlookup.type] - if not chainproc then - -- actually an error - logprocess("%s: %s is not yet supported",cref(kind,chainname,chainlookupname),chainlookup.type) - i = i + 1 - else - local ok, n - if diskchain then - head, start, ok = chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence,chainproc) - else - head, start, ok, n = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,i,sequence) - end - -- messy since last can be changed ! - if ok then - done = true - if n and n > 1 then - -- we have a ligature (cf the spec we advance one but we really need to test it - -- as there are fonts out there that are fuzzy and have too many lookups: - -- - -- U+1105 U+119E U+1105 U+119E : sourcehansansklight: script=hang ccmp=yes - -- - if i + n > nofchainlookups then - -- if trace_contexts then - -- logprocess("%s: quitting lookups",cref(kind,chainname)) - -- end - break - else - -- we need to carry one - end - end - end - i = i + 1 - end - end - if i > nofchainlookups or not start then - break - elseif start then - start = getnext(start) - end - end - end - else - local replacements = ck[7] - if replacements then - head, start, done = chainprocs.reversesub(head,start,last,kind,chainname,ck,lookuphash,replacements) -- sequence - else - done = quit_on_no_replacement -- can be meant to be skipped / quite inconsistent in fonts - if trace_contexts then - logprocess("%s: skipping match",cref(kind,chainname)) - end - end - end - if done then - break -- out of contexts (new, needs checking) - end - end - end - if diskseen then -- maybe move up so that we can turn checking on/off - notmatchpre = { } - notmatchpost = { } - notmatchreplace = { } - end - return head, start, done -end - --- Because we want to keep this elsewhere (an because speed is less an issue) we --- pass the font id so that the verbose variant can access the relevant helper tables. - -local verbose_handle_contextchain = function(font,...) - logwarning("no verbose handler installed, reverting to 'normal'") - otf.setcontextchain() - return normal_handle_contextchain(...) -end - -otf.chainhandlers = { - normal = normal_handle_contextchain, - verbose = verbose_handle_contextchain, -} - -function otf.setcontextchain(method) - if not method or method == "normal" or not otf.chainhandlers[method] then - if handlers.contextchain then -- no need for a message while making the format - logwarning("installing normal contextchain handler") - end - handlers.contextchain = normal_handle_contextchain - else - logwarning("installing contextchain handler %a",method) - local handler = otf.chainhandlers[method] - handlers.contextchain = function(...) - return handler(currentfont,...) -- hm, get rid of ... - end - end - handlers.gsub_context = handlers.contextchain - handlers.gsub_contextchain = handlers.contextchain - handlers.gsub_reversecontextchain = handlers.contextchain - handlers.gpos_contextchain = handlers.contextchain - handlers.gpos_context = handlers.contextchain -end - -otf.setcontextchain() - -local missing = { } -- we only report once - -local function logprocess(...) - if trace_steps then - registermessage(...) - end - report_process(...) -end - -local logwarning = report_process - -local function report_missing_cache(typ,lookup) - local f = missing[currentfont] if not f then f = { } missing[currentfont] = f end - local t = f[typ] if not t then t = { } f[typ] = t end - if not t[lookup] then - t[lookup] = true - logwarning("missing cache for lookup %a, type %a, font %a, name %a",lookup,typ,currentfont,tfmdata.properties.fullname) - end -end - -local resolved = { } -- we only resolve a font,script,language pair once - --- todo: pass all these 'locals' in a table - -local lookuphashes = { } - -setmetatableindex(lookuphashes, function(t,font) - local lookuphash = fontdata[font].resources.lookuphash - if not lookuphash or not next(lookuphash) then - lookuphash = false - end - t[font] = lookuphash - return lookuphash -end) - --- fonts.hashes.lookups = lookuphashes - -local autofeatures = fonts.analyzers.features -- was: constants - -local function initialize(sequence,script,language,enabled) - local features = sequence.features - if features then - local order = sequence.order - if order then - for i=1,#order do -- - local kind = order[i] -- - local valid = enabled[kind] - if valid then - local scripts = features[kind] -- - local languages = scripts[script] or scripts[wildcard] - if languages and (languages[language] or languages[wildcard]) then - return { valid, autofeatures[kind] or false, sequence, kind } - end - end - end - else - -- can't happen - end - end - return false -end - -function otf.dataset(tfmdata,font) -- generic variant, overloaded in context - local shared = tfmdata.shared - local properties = tfmdata.properties - local language = properties.language or "dflt" - local script = properties.script or "dflt" - local enabled = shared.features - local res = resolved[font] - if not res then - res = { } - resolved[font] = res - end - local rs = res[script] - if not rs then - rs = { } - res[script] = rs - end - local rl = rs[language] - if not rl then - rl = { - -- indexed but we can also add specific data by key - } - rs[language] = rl - local sequences = tfmdata.resources.sequences - for s=1,#sequences do - local v = enabled and initialize(sequences[s],script,language,enabled) - if v then - rl[#rl+1] = v - end - end - end - return rl -end - --- assumptions: --- --- * languages that use complex disc nodes - -local function kernrun(disc,run) - -- - -- we catch <font 1><disc font 2> - -- - if trace_kernruns then - report_run("kern") -- will be more detailed - end - -- - local prev = getprev(disc) -- todo, keep these in the main loop - local next = getnext(disc) -- todo, keep these in the main loop - -- - local pre = getfield(disc,"pre") - local post = getfield(disc,"post") - local replace = getfield(disc,"replace") - -- - local prevmarks = prev - -- - -- can be optional, because why on earth do we get a disc after a mark (okay, maybe when a ccmp - -- has happened but then it should be in the disc so basically this test indicates an error) - -- - while prevmarks and getid(prevmarks) == glyph_code and marks[getchar(prevmarks)] and getfont(prevmarks) == currentfont and getsubtype(prevmarks) < 256 do - prevmarks = getprev(prevmarks) - end - -- - if prev and (pre or replace) and not (getid(prev) == glyph_code and getfont(prev) == currentfont and getsubtype(prev)<256) then - prev = false - end - if next and (post or replace) and not (getid(next) == glyph_code and getfont(next) == currentfont and getsubtype(next)<256) then - next = false - end - -- - if not pre then - -- go on - elseif prev then - local nest = getprev(pre) - setfield(pre,"prev",prev) - setfield(prev,"next",pre) - run(prevmarks,"preinjections") - setfield(pre,"prev",nest) - setfield(prev,"next",disc) - else - run(pre,"preinjections") - end - -- - if not post then - -- go on - elseif next then - local tail = find_node_tail(post) - setfield(tail,"next",next) - setfield(next,"prev",tail) - run(post,"postinjections",next) - setfield(tail,"next",nil) - setfield(next,"prev",disc) - else - run(post,"postinjections") - end - -- - if not replace and prev and next then - -- this should be already done by discfound - setfield(prev,"next",next) - setfield(next,"prev",prev) - run(prevmarks,"injections",next) - setfield(prev,"next",disc) - setfield(next,"prev",disc) - elseif prev and next then - local tail = find_node_tail(replace) - local nest = getprev(replace) - setfield(replace,"prev",prev) - setfield(prev,"next",replace) - setfield(tail,"next",next) - setfield(next,"prev",tail) - run(prevmarks,"replaceinjections",next) - setfield(replace,"prev",nest) - setfield(prev,"next",disc) - setfield(tail,"next",nil) - setfield(next,"prev",disc) - elseif prev then - local nest = getprev(replace) - setfield(replace,"prev",prev) - setfield(prev,"next",replace) - run(prevmarks,"replaceinjections") - setfield(replace,"prev",nest) - setfield(prev,"next",disc) - elseif next then - local tail = find_node_tail(replace) - setfield(tail,"next",next) - setfield(next,"prev",tail) - run(replace,"replaceinjections",next) - setfield(tail,"next",nil) - setfield(next,"prev",disc) - else - run(replace,"replaceinjections") - end -end - --- the if new test might be dangerous as luatex will check / set some tail stuff --- in a temp node - -local function comprun(disc,run) - if trace_compruns then - report_run("comp: %s",languages.serializediscretionary(disc)) - end - -- - local pre = getfield(disc,"pre") - if pre then - sweepnode = disc - sweeptype = "pre" -- in alternative code preinjections is used (also used then for proeprties, saves a variable) - local new, done = run(pre) - if done then - setfield(disc,"pre",new) - end - end - -- - local post = getfield(disc,"post") - if post then - sweepnode = disc - sweeptype = "post" - local new, done = run(post) - if done then - setfield(disc,"post",new) - end - end - -- - local replace = getfield(disc,"replace") - if replace then - sweepnode = disc - sweeptype = "replace" - local new, done = run(replace) - if done then - setfield(disc,"replace",new) - end - end - sweepnode = nil - sweeptype = nil -end - -local function testrun(disc,trun,crun) -- use helper - local next = getnext(disc) - if next then - local replace = getfield(disc,"replace") - if replace then - local prev = getprev(disc) - if prev then - -- only look ahead - local tail = find_node_tail(replace) - -- local nest = getprev(replace) - setfield(tail,"next",next) - setfield(next,"prev",tail) - if trun(replace,next) then - setfield(disc,"replace",nil) -- beware, side effects of nest so first - setfield(prev,"next",replace) - setfield(replace,"prev",prev) - setfield(next,"prev",tail) - setfield(tail,"next",next) - setfield(disc,"prev",nil) - setfield(disc,"next",nil) - flush_node_list(disc) - return replace -- restart - else - setfield(tail,"next",nil) - setfield(next,"prev",disc) - end - else - -- weird case - end - else - -- no need - end - else - -- weird case - end - comprun(disc,crun) - return next -end - -local function discrun(disc,drun,krun) - local next = getnext(disc) - local prev = getprev(disc) - if trace_discruns then - report_run("disc") -- will be more detailed - end - if next and prev then - setfield(prev,"next",next) - -- setfield(next,"prev",prev) - drun(prev) - setfield(prev,"next",disc) - -- setfield(next,"prev",disc) - end - -- - local pre = getfield(disc,"pre") - if not pre then - -- go on - elseif prev then - local nest = getprev(pre) - setfield(pre,"prev",prev) - setfield(prev,"next",pre) - krun(prev,"preinjections") - setfield(pre,"prev",nest) - setfield(prev,"next",disc) - else - krun(pre,"preinjections") - end - return next -end - --- todo: maybe run lr and rl stretches - -local function featuresprocessor(head,font,attr) - - local lookuphash = lookuphashes[font] -- we can also check sequences here - - if not lookuphash then - return head, false - end - - head = tonut(head) - - if trace_steps then - checkstep(head) - end - - tfmdata = fontdata[font] - descriptions = tfmdata.descriptions - characters = tfmdata.characters - resources = tfmdata.resources - - marks = resources.marks - anchorlookups = resources.lookup_to_anchor - lookuptable = resources.lookups - lookuptypes = resources.lookuptypes - lookuptags = resources.lookuptags - - currentfont = font - rlmode = 0 - sweephead = { } - - local sequences = resources.sequences - local done = false - local datasets = otf.dataset(tfmdata,font,attr) - - local dirstack = { } -- could move outside function - - -- We could work on sub start-stop ranges instead but I wonder if there is that - -- much speed gain (experiments showed that it made not much sense) and we need - -- to keep track of directions anyway. Also at some point I want to play with - -- font interactions and then we do need the full sweeps. - - -- Keeping track of the headnode is needed for devanagari (I generalized it a bit - -- so that multiple cases are also covered.) - - -- We don't goto the next node of a disc node is created so that we can then treat - -- the pre, post and replace. It's abit of a hack but works out ok for most cases. - - -- there can be less subtype and attr checking in the comprun etc helpers - - for s=1,#datasets do - local dataset = datasets[s] - featurevalue = dataset[1] -- todo: pass to function instead of using a global - local attribute = dataset[2] - local sequence = dataset[3] -- sequences[s] -- also dataset[5] - local kind = dataset[4] - ----- chain = dataset[5] -- sequence.chain or 0 - local rlparmode = 0 - local topstack = 0 - local success = false - local typ = sequence.type - local gpossing = typ == "gpos_single" or typ == "gpos_pair" -- maybe all of them - local subtables = sequence.subtables - local handler = handlers[typ] - if typ == "gsub_reversecontextchain" then -- chain < 0 - -- this is a limited case, no special treatments like 'init' etc - -- we need to get rid of this slide! probably no longer needed in latest luatex - local start = find_node_tail(head) -- slow (we can store tail because there's always a skip at the end): todo - while start do - local id = getid(start) - if id == glyph_code then - if getfont(start) == font and getsubtype(start) < 256 then - local a = getattr(start,0) - if a then - a = a == attr - else - a = true - end - if a then - local char = getchar(start) - for i=1,#subtables do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local lookupmatch = lookupcache[char] - if lookupmatch then - -- todo: disc? - head, start, success = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i) - if success then - break - end - end - else - report_missing_cache(typ,lookupname) - end - end - if start then start = getprev(start) end - else - start = getprev(start) - end - else - start = getprev(start) - end - else - start = getprev(start) - end - end - else - local ns = #subtables - local start = head -- local ? - rlmode = 0 -- to be checked ? - if ns == 1 then -- happens often - local lookupname = subtables[1] - local lookupcache = lookuphash[lookupname] - if not lookupcache then -- also check for empty cache - report_missing_cache(typ,lookupname) - else - - local function c_run(head) -- no need to check for 256 and attr probably also the same - local done = false - local start = sweephead[head] - if start then - sweephead[head] = nil - else - start = head - end - while start do - local id = getid(start) - if id ~= glyph_code then - -- very unlikely - start = getnext(start) - elseif getfont(start) == font and getsubtype(start) < 256 then - local a = getattr(start,0) - if a then - a = (a == attr) and (not attribute or getprop(start,a_state) == attribute) - else - a = not attribute or getprop(start,a_state) == attribute - end - if a then - local lookupmatch = lookupcache[getchar(start)] - if lookupmatch then - -- sequence kan weg - local ok - head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,1) - if ok then - done = true - end - end - if start then start = getnext(start) end - else - start = getnext(start) - end - else - return head, false - end - end - if done then - success = true -- needed in this subrun? - end - return head, done - end - - local function t_run(start,stop) - while start ~= stop do - local id = getid(start) - if id == glyph_code and getfont(start) == font and getsubtype(start) < 256 then - local a = getattr(start,0) - if a then - a = (a == attr) and (not attribute or getprop(start,a_state) == attribute) - else - a = not attribute or getprop(start,a_state) == attribute - end - if a then - local lookupmatch = lookupcache[getchar(start)] - if lookupmatch then -- hm, hyphens can match (tlig) so we need to really check - -- if we need more than ligatures we can outline the code and use functions - local s = getnext(start) - local l = nil - while s do - local lg = lookupmatch[getchar(s)] - if lg then - l = lg - s = getnext(s) - else - break - end - end - if l and l.ligature then - return true - end - end - end - start = getnext(start) - else - break - end - end - end - - local function d_run(prev) -- we can assume that prev and next are glyphs - local a = getattr(prev,0) - if a then - a = (a == attr) and (not attribute or getprop(prev,a_state) == attribute) - else - a = not attribute or getprop(prev,a_state) == attribute - end - if a then - local lookupmatch = lookupcache[getchar(prev)] - if lookupmatch then - -- sequence kan weg - local h, d, ok = handler(head,prev,kind,lookupname,lookupmatch,sequence,lookuphash,1) - if ok then - done = true - success = true - end - end - end - end - - local function k_run(sub,injection,last) - local a = getattr(sub,0) - if a then - a = (a == attr) and (not attribute or getprop(sub,a_state) == attribute) - else - a = not attribute or getprop(sub,a_state) == attribute - end - if a then - -- sequence kan weg - for n in traverse_nodes(sub) do -- only gpos - if n == last then - break - end - local id = getid(n) - if id == glyph_code then - local lookupmatch = lookupcache[getchar(n)] - if lookupmatch then - local h, d, ok = handler(sub,n,kind,lookupname,lookupmatch,sequence,lookuphash,1,injection) - if ok then - done = true - success = true - end - end - else - -- message - end - end - end - end - - while start do - local id = getid(start) - if id == glyph_code then - if getfont(start) == font and getsubtype(start) < 256 then -- why a 256 test ... - local a = getattr(start,0) - if a then - a = (a == attr) and (not attribute or getprop(start,a_state) == attribute) - else - a = not attribute or getprop(start,a_state) == attribute - end - if a then - local char = getchar(start) - local lookupmatch = lookupcache[char] - if lookupmatch then - -- sequence kan weg - local ok - head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,1) - if ok then - success = true - elseif gpossing and zwnjruns and char == zwnj then - discrun(start,d_run) - end - elseif gpossing and zwnjruns and char == zwnj then - discrun(start,d_run) - end - if start then start = getnext(start) end - else - start = getnext(start) - end - else - start = getnext(start) - end - elseif id == disc_code then - if gpossing then - kernrun(start,k_run) - start = getnext(start) - elseif typ == "gsub_ligature" then - start = testrun(start,t_run,c_run) - else - comprun(start,c_run) - start = getnext(start) - end - elseif id == math_code then - start = getnext(end_of_math(start)) - else - start = getnext(start) - end - end - end - - else - - local function c_run(head) - local done = false - local start = sweephead[head] - if start then - sweephead[head] = nil - else - start = head - end - while start do - local id = getid(start) - if id ~= glyph_code then - -- very unlikely - start = getnext(start) - elseif getfont(start) == font and getsubtype(start) < 256 then - local a = getattr(start,0) - if a then - a = (a == attr) and (not attribute or getprop(start,a_state) == attribute) - else - a = not attribute or getprop(start,a_state) == attribute - end - if a then - local char = getchar(start) - for i=1,ns do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local lookupmatch = lookupcache[char] - if lookupmatch then - -- we could move all code inline but that makes things even more unreadable - local ok - head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i) - if ok then - done = true - break - elseif not start then - -- don't ask why ... shouldn't happen - break - end - end - else - report_missing_cache(typ,lookupname) - end - end - if start then start = getnext(start) end - else - start = getnext(start) - end - else - return head, false - end - end - if done then - success = true - end - return head, done - end - - local function d_run(prev) - local a = getattr(prev,0) - if a then - a = (a == attr) and (not attribute or getprop(prev,a_state) == attribute) - else - a = not attribute or getprop(prev,a_state) == attribute - end - if a then - -- brr prev can be disc - local char = getchar(prev) - for i=1,ns do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local lookupmatch = lookupcache[char] - if lookupmatch then - -- we could move all code inline but that makes things even more unreadable - local h, d, ok = handler(head,prev,kind,lookupname,lookupmatch,sequence,lookuphash,i) - if ok then - done = true - break - end - end - else - report_missing_cache(typ,lookupname) - end - end - end - end - - local function k_run(sub,injection,last) - local a = getattr(sub,0) - if a then - a = (a == attr) and (not attribute or getprop(sub,a_state) == attribute) - else - a = not attribute or getprop(sub,a_state) == attribute - end - if a then - for n in traverse_nodes(sub) do -- only gpos - if n == last then - break - end - local id = getid(n) - if id == glyph_code then - local char = getchar(n) - for i=1,ns do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local lookupmatch = lookupcache[char] - if lookupmatch then - local h, d, ok = handler(head,n,kind,lookupname,lookupmatch,sequence,lookuphash,i,injection) - if ok then - done = true - break - end - end - else - report_missing_cache(typ,lookupname) - end - end - else - -- message - end - end - end - end - - local function t_run(start,stop) - while start ~= stop do - local id = getid(start) - if id == glyph_code and getfont(start) == font and getsubtype(start) < 256 then - local a = getattr(start,0) - if a then - a = (a == attr) and (not attribute or getprop(start,a_state) == attribute) - else - a = not attribute or getprop(start,a_state) == attribute - end - if a then - local char = getchar(start) - for i=1,ns do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local lookupmatch = lookupcache[char] - if lookupmatch then - -- if we need more than ligatures we can outline the code and use functions - local s = getnext(start) - local l = nil - while s do - local lg = lookupmatch[getchar(s)] - if lg then - l = lg - s = getnext(s) - else - break - end - end - if l and l.ligature then - return true - end - end - else - report_missing_cache(typ,lookupname) - end - end - end - start = getnext(start) - else - break - end - end - end - - while start do - local id = getid(start) - if id == glyph_code then - if getfont(start) == font and getsubtype(start) < 256 then - local a = getattr(start,0) - if a then - a = (a == attr) and (not attribute or getprop(start,a_state) == attribute) - else - a = not attribute or getprop(start,a_state) == attribute - end - if a then - for i=1,ns do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local char = getchar(start) - local lookupmatch = lookupcache[char] - if lookupmatch then - -- we could move all code inline but that makes things even more unreadable - local ok - head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i) - if ok then - success = true - break - elseif not start then - -- don't ask why ... shouldn't happen - break - elseif gpossing and zwnjruns and char == zwnj then - discrun(start,d_run) - end - elseif gpossing and zwnjruns and char == zwnj then - discrun(start,d_run) - end - else - report_missing_cache(typ,lookupname) - end - end - if start then start = getnext(start) end - else - start = getnext(start) - end - else - start = getnext(start) - end - elseif id == disc_code then - if gpossing then - kernrun(start,k_run) - start = getnext(start) - elseif typ == "gsub_ligature" then - start = testrun(start,t_run,c_run) - else - comprun(start,c_run) - start = getnext(start) - end - elseif id == math_code then - start = getnext(end_of_math(start)) - else - start = getnext(start) - end - end - end - end - if success then - done = true - end - if trace_steps then -- ? - registerstep(head) - end - - end - - head = tonode(head) - - return head, done -end - --- this might move to the loader - -local function generic(lookupdata,lookupname,unicode,lookuphash) - local target = lookuphash[lookupname] - if target then - target[unicode] = lookupdata - else - lookuphash[lookupname] = { [unicode] = lookupdata } - end -end - -local function ligature(lookupdata,lookupname,unicode,lookuphash) - local target = lookuphash[lookupname] - if not target then - target = { } - lookuphash[lookupname] = target - end - for i=1,#lookupdata do - local li = lookupdata[i] - local tu = target[li] - if not tu then - tu = { } - target[li] = tu - end - target = tu - end - target.ligature = unicode -end - -local function pair(lookupdata,lookupname,unicode,lookuphash) - local target = lookuphash[lookupname] - if not target then - target = { } - lookuphash[lookupname] = target - end - local others = target[unicode] - local paired = lookupdata[1] - if others then - others[paired] = lookupdata - else - others = { [paired] = lookupdata } - target[unicode] = others - end -end - -local action = { - substitution = generic, - multiple = generic, - alternate = generic, - position = generic, - ligature = ligature, - pair = pair, - kern = pair, -} - -local function prepare_lookups(tfmdata) - - local rawdata = tfmdata.shared.rawdata - local resources = rawdata.resources - local lookuphash = resources.lookuphash - local anchor_to_lookup = resources.anchor_to_lookup - local lookup_to_anchor = resources.lookup_to_anchor - local lookuptypes = resources.lookuptypes - local characters = tfmdata.characters - local descriptions = tfmdata.descriptions - local duplicates = resources.duplicates - - -- we cannot free the entries in the descriptions as sometimes we access - -- then directly (for instance anchors) ... selectively freeing does save - -- much memory as it's only a reference to a table and the slot in the - -- description hash is not freed anyway - - -- we can delay this using metatables so that we don't make the hashes for - -- features we don't use but then we need to loop over the characters - -- many times so we gain nothing - - for unicode, character in next, characters do -- we cannot loop over descriptions ! - - local description = descriptions[unicode] - - if description then - - local lookups = description.slookups - if lookups then - for lookupname, lookupdata in next, lookups do - action[lookuptypes[lookupname]](lookupdata,lookupname,unicode,lookuphash,duplicates) - end - end - - local lookups = description.mlookups - if lookups then - for lookupname, lookuplist in next, lookups do - local lookuptype = lookuptypes[lookupname] - for l=1,#lookuplist do - local lookupdata = lookuplist[l] - action[lookuptype](lookupdata,lookupname,unicode,lookuphash,duplicates) - end - end - end - - local list = description.kerns - if list then - for lookup, krn in next, list do -- ref to glyph, saves lookup - local target = lookuphash[lookup] - if target then - target[unicode] = krn - else - lookuphash[lookup] = { [unicode] = krn } - end - end - end - - local list = description.anchors - if list then - for typ, anchors in next, list do -- types - if typ == "mark" or typ == "cexit" then -- or entry? - for name, anchor in next, anchors do - local lookups = anchor_to_lookup[name] - if lookups then - for lookup in next, lookups do - local target = lookuphash[lookup] - if target then - target[unicode] = anchors - else - lookuphash[lookup] = { [unicode] = anchors } - end - end - end - end - end - end - end - - end - - end - -end - --- so far - -local function split(replacement,original) - local result = { } - for i=1,#replacement do - result[original[i]] = replacement[i] - end - return result -end - -local valid = { - coverage = { chainsub = true, chainpos = true, contextsub = true }, - reversecoverage = { reversesub = true }, - glyphs = { chainsub = true, chainpos = true }, -} - -local function prepare_contextchains(tfmdata) - local rawdata = tfmdata.shared.rawdata - local resources = rawdata.resources - local lookuphash = resources.lookuphash - local lookuptags = resources.lookuptags - local lookups = rawdata.lookups - if lookups then - for lookupname, lookupdata in next, rawdata.lookups do - local lookuptype = lookupdata.type - if lookuptype then - local rules = lookupdata.rules - if rules then - local format = lookupdata.format - local validformat = valid[format] - if not validformat then - report_prepare("unsupported format %a",format) - elseif not validformat[lookuptype] then - -- todo: dejavu-serif has one (but i need to see what use it has) - report_prepare("unsupported format %a, lookuptype %a, lookupname %a",format,lookuptype,lookuptags[lookupname]) - else - local contexts = lookuphash[lookupname] - if not contexts then - contexts = { } - lookuphash[lookupname] = contexts - end - local t, nt = { }, 0 - for nofrules=1,#rules do - local rule = rules[nofrules] - local current = rule.current - local before = rule.before - local after = rule.after - local replacements = rule.replacements - local sequence = { } - local nofsequences = 0 - -- Eventually we can store start, stop and sequence in the cached file - -- but then less sharing takes place so best not do that without a lot - -- of profiling so let's forget about it. - if before then - for n=1,#before do - nofsequences = nofsequences + 1 - sequence[nofsequences] = before[n] - end - end - local start = nofsequences + 1 - for n=1,#current do - nofsequences = nofsequences + 1 - sequence[nofsequences] = current[n] - end - local stop = nofsequences - if after then - for n=1,#after do - nofsequences = nofsequences + 1 - sequence[nofsequences] = after[n] - end - end - if sequence[1] then - -- Replacements only happen with reverse lookups as they are single only. We - -- could pack them into current (replacement value instead of true) and then - -- use sequence[start] instead but it's somewhat ugly. - nt = nt + 1 - t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups, replacements } - for unic in next, sequence[start] do - local cu = contexts[unic] - if not cu then - contexts[unic] = t - end - end - end - end - end - else - -- no rules - end - else - report_prepare("missing lookuptype for lookupname %a",lookuptags[lookupname]) - end - end - end -end - --- we can consider lookuphash == false (initialized but empty) vs lookuphash == table - -local function featuresinitializer(tfmdata,value) - if true then -- value then - -- beware we need to use the topmost properties table - local rawdata = tfmdata.shared.rawdata - local properties = rawdata.properties - if not properties.initialized then - local starttime = trace_preparing and os.clock() - local resources = rawdata.resources - resources.lookuphash = resources.lookuphash or { } - prepare_contextchains(tfmdata) - prepare_lookups(tfmdata) - properties.initialized = true - if trace_preparing then - report_prepare("preparation time is %0.3f seconds for %a",os.clock()-starttime,tfmdata.properties.fullname) - end - end - end -end - -registerotffeature { - name = "features", - description = "features", - default = true, - initializers = { - position = 1, - node = featuresinitializer, - }, - processors = { - node = featuresprocessor, - } -} - --- This can be used for extra handlers, but should be used with care! - -otf.handlers = handlers |