diff options
Diffstat (limited to 'tex/context/base/typo-krn.lua')
| -rw-r--r-- | tex/context/base/typo-krn.lua | 529 |
1 files changed, 353 insertions, 176 deletions
diff --git a/tex/context/base/typo-krn.lua b/tex/context/base/typo-krn.lua index 5729c72c0..1616577dc 100644 --- a/tex/context/base/typo-krn.lua +++ b/tex/context/base/typo-krn.lua @@ -11,7 +11,8 @@ if not modules then modules = { } end modules ['typo-krn'] = { local next, type, tonumber = next, type, tonumber local utfchar = utf.char -local nodes, node, fonts = nodes, node, fonts +local nodes = nodes +local fonts = fonts local tasks = nodes.tasks local nuts = nodes.nuts @@ -20,11 +21,10 @@ local nodepool = nuts.pool local tonode = nuts.tonode local tonut = nuts.tonut +-- check what is used + local find_node_tail = nuts.tail local free_node = nuts.free -local free_nodelist = nuts.flush_list -local copy_node = nuts.copy -local copy_nodelist = nuts.copy_list local insert_node_before = nuts.insert_before local insert_node_after = nuts.insert_after local end_of_math = nuts.end_of_math @@ -51,6 +51,7 @@ local nodecodes = nodes.nodecodes local kerncodes = nodes.kerncodes local skipcodes = nodes.skipcodes local disccodes = nodes.disccodes +local listcodes = nodes.listcodes local glyph_code = nodecodes.glyph local kern_code = nodecodes.kern @@ -60,7 +61,12 @@ local hlist_code = nodecodes.hlist local vlist_code = nodecodes.vlist local math_code = nodecodes.math +local box_list_code = listcodes.box +local user_list_code = listcodes.unknown + local discretionary_code = disccodes.discretionary +local automatic_code = disccodes.automatic + local kerning_code = kerncodes.kerning local userkern_code = kerncodes.userkern local userskip_code = skipcodes.userskip @@ -203,20 +209,178 @@ local function spec_injector(fillup,width,stretch,shrink) end end --- needs checking ... base mode / node mode -- also use insert_before/after etc +-- a simple list injector, no components and such .. just disable ligatures in +-- kern mode .. maybe not even hyphenate ... anyway, the next one is for simple +-- sublists .. beware: we can have char -1 + +local function inject_begin(boundary,prev,keeptogether,krn,ok) -- prev is a glyph + local id = getid(boundary) + if id == kern_code then + if getsubtype(boundary) == kerning_code or getattr(boundary,a_fontkern) then + local inject = true + if keeptogether then + local next = getnext(boundary) + if not next or (getid(next) == glyph_code and keeptogether(prev,next)) then + inject = false + end + end + if inject then + -- not yet ok, as injected kerns can be overlays (from node-inj.lua) + setfield(boundary,"subtype",userkern_code) + setfield(boundary,"kern",getfield(boundary,"kern") + quaddata[getfont(prev)]*krn) + return boundary, true + end + end + elseif id == glyph_code then + if keeptogether and keeptogether(boundary,prev) then + -- keep 'm + else + local charone = getchar(prev) + if charone > 0 then + local font = getfont(boundary) + local chartwo = getchar(boundary) + local kerns = chardata[font][charone].kerns + local kern = new_kern((kerns and kerns[chartwo] or 0) + quaddata[font]*krn) + setfield(boundary,"prev",kern) + setfield(kern,"next",boundary) + return kern, true + end + end + end + return boundary, ok +end + +local function inject_end(boundary,next,keeptogether,krn,ok) + local tail = find_node_tail(boundary) + local id = getid(tail) + if id == kern_code then + if getsubtype(tail) == kerning_code or getattr(tail,a_fontkern) then + local inject = true + if keeptogether then + local prev = getprev(tail) + if getid(prev) == glyph_code and keeptogether(prev,two) then + inject = false + end + end + if inject then + -- not yet ok, as injected kerns can be overlays (from node-inj.lua) + setfield(tail,"subtype",userkern_code) + setfield(tail,"kern",getfield(tail,"kern") + quaddata[getfont(next)]*krn) + return boundary, true + end + end + elseif id == glyph_code then + if keeptogether and keeptogether(tail,two) then + -- keep 'm + else + local charone = getchar(tail) + if charone > 0 then + local font = getfont(tail) + local chartwo = getchar(next) + local kerns = chardata[font][charone].kerns + local kern = (kerns and kerns[chartwo] or 0) + quaddata[font]*krn + insert_node_after(boundary,tail,new_kern(kern)) + return boundary, true + end + end + end + return boundary, ok +end + +local function process_list(head,keeptogether,krn,font,okay) + local start = head + local prev = nil + local pid = nil + local kern = 0 + local mark = font and markdata[font] + while start do + local id = getid(start) + if id == glyph_code then + if not font then + font = getfont(start) + mark = markdata[font] + kern = quaddata[font]*krn + end + if prev then + local char = getchar(start) + if mark[char] then + -- skip + elseif pid == kern_code then + if getsubtype(prev) == kerning_code or getattr(prev,a_fontkern) then + local inject = true + if keeptogether then + local prevprev = getprev(prev) + if getid(prevprev) == glyph_code and keeptogether(prevprev,start) then + inject = false + end + end + if inject then + -- not yet ok, as injected kerns can be overlays (from node-inj.lua) + setfield(prev,"subtype",userkern_code) + setfield(prev,"kern",getfield(prev,"kern") + kern) + okay = true + end + end + elseif pid == glyph_code then + if keeptogether and keeptogether(prev,start) then + -- keep 'm + else + local prevchar = getchar(prev) + local kerns = chardata[font][prevchar].kerns + -- if kerns then + -- print("it happens indeed, basemode kerns not yet injected") + -- end + insert_node_before(head,start,new_kern((kerns and kerns[char] or 0) + kern)) + okay = true + end + end + end + end + if start then + prev = start + pid = id + start = getnext(start) + end + end + return head, okay, prev +end -local function do_process(head,force) -- todo: glue so that we can fully stretch +local function closest_bound(b,get) + b = get(b) + if b and getid(b) ~= glue_code then + while b do + if not getattr(b,a_kerns) then + break + elseif getid(b) == glyph_code then + return b, getfont(b) + else + b = get(b) + end + end + end +end + +function kerns.handler(head) + local head = tonut(head) local start = head local done = false local lastfont = nil local keepligature = kerns.keepligature local keeptogether = kerns.keeptogether local fillup = false + local bound = false + local prev = nil + local previd = nil + local prevchar = nil + local prevfont = nil + local prevmark = nil while start do - -- faster to test for attr first - local attr = force or getattr(start,a_kerns) + -- fontkerns don't get the attribute but they always sit between glyphs so + -- are always valid bound .. disc nodes also somtimes don't get them + local id = getid(start) + local attr = getattr(start,a_kerns) if attr and attr > 0 then - setattr(start,a_kerns,unsetvalue) + setattr(start,a_kerns,0) -- unsetvalue) local krn = mapping[attr] if krn == v_max then krn = .25 @@ -224,21 +388,21 @@ local function do_process(head,force) -- todo: glue so that we can fully stretch else fillup = false end - if krn and krn ~= 0 then - local id = getid(start) - if id == glyph_code then -- we could use the subtype ligature - lastfont = getfont(start) - local c = getfield(start,"components") - if not c then - -- fine - elseif keepligature and keepligature(start) then - -- keep 'm - else - c = do_process(c,attr) - local s = start - local p = getprev(s) - local n = getnext(s) - local tail = find_node_tail(c) + if not krn or krn == 0 then + bound = false + elseif id == glyph_code then -- we could use the subtype ligature + local c = getfield(start,"components") + if not c then + -- fine + elseif keepligature and keepligature(start) then + -- keep 'm + c = nil + else + while c do + local s = start + local t = find_node_tail(c) + local p = getprev(s) + local n = getnext(s) if p then setfield(p,"next",c) setfield(c,"prev",p) @@ -246,172 +410,190 @@ local function do_process(head,force) -- todo: glue so that we can fully stretch head = c end if n then - setfield(n,"prev",tail) + setfield(n,"prev",t) + setfield(t,"next",n) end - setfield(tail,"next",n) start = c setfield(s,"components",nil) - -- we now leak nodes ! - -- free_node(s) - done = true + free_node(s) + c = getfield(start,"components") end - local prev = getprev(start) - if not prev then - -- skip - elseif markdata[lastfont][getchar(start)] then - -- skip - else - local pid = getid(prev) - if not pid then - -- nothing - elseif pid == kern_code then - if getsubtype(prev) == kerning_code or getattr(prev,a_fontkern) then - if keeptogether and getid(getprev(prev)) == glyph_code and keeptogether(getprev(prev),start) then -- we could also pass start - -- keep 'm - else - -- not yet ok, as injected kerns can be overlays (from node-inj.lua) - setfield(prev,"subtype",userkern_code) - setfield(prev,"kern",getfield(prev,"kern") + quaddata[lastfont]*krn) -- here - done = true - end - end - elseif pid == glyph_code then - if getfont(prev) == lastfont then - local prevchar, lastchar = getchar(prev), getchar(start) - if keeptogether and keeptogether(prev,start) then - -- keep 'm - else - local kerns = chardata[lastfont][prevchar].kerns - local kern = kerns and kerns[lastchar] or 0 - krn = kern + quaddata[lastfont]*krn -- here - insert_node_before(head,start,kern_injector(fillup,krn)) - done = true - end - else - krn = quaddata[lastfont]*krn -- here - insert_node_before(head,start,kern_injector(fillup,krn)) - done = true - end - elseif pid == disc_code then - -- a bit too complicated, we can best not copy and just calculate - -- but we could have multiple glyphs involved so ... - local disc = prev -- disc - local prv = getprev(disc) - local nxt = getnext(disc) - if getsubtype(disc) == discretionary_code then - -- maybe we should forget about this variant as there is no glue - -- possible .. hardly used so a copy doesn't hurt much - local pre = getfield(disc,"pre") - local post = getfield(disc,"post") - local replace = getfield(disc,"replace") - if pre and prv then -- must pair with getprev(start) - local before = copy_node(prv) - setfield(pre,"prev",before) - setfield(before,"next",pre) - setfield(before,"prev",nil) - pre = do_process(before,attr) - pre = getnext(pre) - setfield(pre,"prev",nil) - setfield(disc,"pre",pre) - free_node(before) - end - if post and nxt then -- must pair with start - local after = copy_node(nxt) - local tail = find_node_tail(post) - setfield(tail,"next",after) - setfield(after,"prev",tail) - setfield(after,"next",nil) - post = do_process(post,attr) - setfield(tail,"next",nil) - setfield(disc,"post",post) - free_node(after) - end - if replace and prv and nxt then -- must pair with start and start.prev - local before = copy_node(prv) - local after = copy_node(nxt) - local tail = find_node_tail(replace) - setfield(replace,"prev",before) - setfield(before,"next",replace) - setfield(before,"prev",nil) - setfield(tail,"next",after) - setfield(after,"prev",tail) - setfield(after,"next",nil) - replace = do_process(before,attr) - replace = getnext(replace) - setfield(replace,"prev",nil) - setfield(getfield(after,"prev"),"next",nil) - setfield(disc,"replace",replace) - free_node(after) - free_node(before) - elseif prv and getid(prv) == glyph_code and getfont(prv) == lastfont then - local prevchar = getchar(prv) - local lastchar = getchar(start) - local kerns = chardata[lastfont][prevchar].kerns - local kern = kerns and kerns[lastchar] or 0 - krn = kern + quaddata[lastfont]*krn -- here - setfield(disc,"replace",kern_injector(false,krn)) -- only kerns permitted, no glue - else - krn = quaddata[lastfont]*krn -- here - setfield(disc,"replace",kern_injector(false,krn)) -- only kerns permitted, no glue - end - else - -- this one happens in most cases: automatic (-), explicit (\-), regular (patterns) - if prv and getid(prv) == glyph_code and getfont(prv) == lastfont then - -- the normal case - local prevchar = getchar(prv) - local lastchar = getchar(start) - local kerns = chardata[lastfont][prevchar].kerns - local kern = kerns and kerns[lastchar] or 0 - krn = kern + quaddata[lastfont]*krn - else - krn = quaddata[lastfont]*krn - end - insert_node_before(head,start,kern_injector(fillup,krn)) + end + local char = getchar(start) + local font = getfont(start) + local mark = markdata[font] + if not bound then + -- yet + elseif mark[char] then + -- skip + elseif previd == kern_code then + if getsubtype(prev) == kerning_code or getattr(prev,a_fontkern) then + local inject = true + if keeptogether then + if previd == glyph_code and keeptogether(prev,start) then + inject = false end end + if inject then + -- not yet ok, as injected kerns can be overlays (from node-inj.lua) + setfield(prev,"subtype",userkern_code) + setfield(prev,"kern",getfield(prev,"kern") + quaddata[font]*krn) + done = true + end end - elseif id == glue_code then - local subtype = getsubtype(start) - if subtype == userskip_code or subtype == xspaceskip_code or subtype == spaceskip_code then - local s = getfield(start,"spec") - local w = getfield(s,"width") - if w > 0 then - local width = w+gluefactor*w*krn - local stretch = getfield(s,"stretch") - local shrink = getfield(s,"shrink") - setfield(start,"spec",spec_injector(fillup,width,stretch*width/w,shrink*width/w)) + elseif previd == glyph_code then + if prevfont == font then + if keeptogether and keeptogether(prev,start) then + -- keep 'm + else + local kerns = chardata[font][prevchar].kerns + local kern = (kerns and kerns[char] or 0) + quaddata[font]*krn + insert_node_before(head,start,kern_injector(fillup,kern)) done = true end + else + insert_node_before(head,start,kern_injector(fillup,quaddata[font]*krn)) + done = true + end + end + prev = start + prevchar = char + prevfont = font + prevmark = mark + previd = id + bound = true + elseif id == disc_code then + local prev, next, pglyph, nglyph -- delayed till needed + local subtype = getsubtype(start) + if subtype == automatic_code then + -- this is kind of special, as we have already injected the + -- previous kern + local prev = getprev(start) + local pglyph = prev and getid(prev) == glyph_code + languages.expand(start,pglyph and prev) + -- we can have a different start now + elseif subtype ~= discretionary_code then + prev = getprev(start) + pglyph = prev and getid(prev) == glyph_code + languages.expand(start,pglyph and prev) + end + local pre = getfield(start,"pre") + local post = getfield(start,"post") + local replace = getfield(start,"replace") + -- we really need to reasign the fields as luatex keeps track of + -- the tail in a temp preceding head .. kind of messy so we might + -- want to come up with a better solution some day like a real + -- pretail etc fields in a disc node + -- + -- maybe i'll merge the now split functions + if pre then + local okay = false + if not prev then + prev = prev or getprev(start) + pglyph = prev and getid(prev) == glyph_code + end + if pglyph then + pre, okay = inject_begin(pre,prev,keeptogether,krn,okay) + end + pre, okay = process_list(pre,keeptogether,krn,false,okay) + if okay then + setfield(start,"pre",pre) + done = true + end + end + if post then + local okay = false + if not next then + next = getnext(start) + nglyph = next and getid(next) == glyph_code + end + if nglyph then + post, okay = inject_end(post,next,keeptogether,krn,okay) end - elseif id == kern_code then - -- if getsubtype(start) == kerning_code then -- handle with glyphs - -- local sk = getfield(start,"kern") - -- if sk > 0 then - -- setfield(start,"kern",sk*krn) - -- done = true - -- end - -- end - elseif lastfont and (id == hlist_code or id == vlist_code) then -- todo: lookahead - local p = getprev(start) - if p and getid(p) ~= glue_code then - insert_node_before(head,start,kern_injector(fillup,quaddata[lastfont]*krn)) + post, okay = process_list(post,keeptogether,krn,false,okay) + if okay then + setfield(start,"post",post) done = true end - local n = getnext(start) - if n and getid(n) ~= glue_code then - insert_node_after(head,start,kern_injector(fillup,quaddata[lastfont]*krn)) + end + if replace then + local okay = false + if not prev then + prev = prev or getprev(start) + pglyph = prev and getid(prev) == glyph_code + end + if pglyph then + replace, okay = inject_begin(replace,prev,keeptogether,krn,okay) + end + if not next then + next = getnext(start) + nglyph = next and getid(next) == glyph_code + end + if nglyph then + replace, okay = inject_end(replace,next,keeptogether,krn,okay) + end + replace, okay = process_list(replace,keeptogether,krn,false,okay) + if okay then + setfield(start,"replace",replace) done = true end - elseif id == math_code then - start = end_of_math(start) + elseif prevfont then + setfield(start,"replace",new_kern(quaddata[prevfont]*krn)) + done = true end + bound = false + elseif id == kern_code then + bound = getsubtype(start) == kerning_code or getattr(start,a_fontkern) + prev = start + previd = id + elseif id == glue_code then + local subtype = getsubtype(start) + if subtype == userskip_code or subtype == xspaceskip_code or subtype == spaceskip_code then + local s = getfield(start,"spec") + local w = getfield(s,"width") + if w > 0 then + local width = w+gluefactor*w*krn + local stretch = getfield(s,"stretch") + local shrink = getfield(s,"shrink") + setfield(start,"spec",spec_injector(fillup,width,stretch*width/w,shrink*width/w)) + done = true + end + end + bound = false + elseif id == hlist_code or id == vlist_code then + local subtype = getsubtype(start) + if subtype == user_list_code or subtype == box_list_code then + -- special case + local b, f = closest_bound(start,getprev) + if b then + insert_node_before(head,start,kern_injector(fillup,quaddata[f]*krn)) + done = true + end + local b, f = closest_bound(start,getnext) + if b then + insert_node_after(head,start,kern_injector(fillup,quaddata[f]*krn)) + done = true + end + end + bound = false + elseif id == math_code then + start = end_of_math(start) + bound = false end - end - if start then + if start then + start = getnext(start) + end + elseif id == kern_code then + bound = getsubtype(start) == kerning_code or getattr(start,a_fontkern) + prev = start + previd = id + start = getnext(start) + else + bound = false start = getnext(start) end end - return head, done + return tonode(head), done end local enabled = false @@ -438,11 +620,6 @@ function kerns.set(factor) return factor end -function kerns.handler(head) - local head, done = do_process(tonut(head)) -- no direct map, because else fourth argument is tail == true - return tonode(head), done -end - -- interface commands.setcharacterkerning = kerns.set |