diff options
Diffstat (limited to 'otfl-font-ota.lua')
| -rw-r--r-- | otfl-font-ota.lua | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/otfl-font-ota.lua b/otfl-font-ota.lua new file mode 100644 index 0000000..c6a5b29 --- /dev/null +++ b/otfl-font-ota.lua @@ -0,0 +1,305 @@ +if not modules then modules = { } end modules ['font-ota'] = { + version = 1.001, + comment = "companion to font-otf.lua (analysing)", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- this might become scrp-*.lua + +local type, tostring, match, format, concat = type, tostring, string.match, string.format, table.concat + +if not trackers then trackers = { register = function() end } end + +local trace_analyzing = false trackers.register("otf.analyzing", function(v) trace_analyzing = v end) +local trace_cjk = false trackers.register("cjk.injections", function(v) trace_cjk = v end) + +trackers.register("cjk.analyzing","otf.analyzing") + +fonts = fonts or { } +fonts.analyzers = fonts.analyzers or { } +fonts.analyzers.initializers = fonts.analyzers.initializers or { node = { otf = { } } } +fonts.analyzers.methods = fonts.analyzers.methods or { node = { otf = { } } } + +local otf = fonts.otf +local tfm = fonts.tfm + +local initializers = fonts.analyzers.initializers +local methods = fonts.analyzers.methods + +local glyph = node.id('glyph') +local glue = node.id('glue') +local penalty = node.id('penalty') + +local set_attribute = node.set_attribute +local has_attribute = node.has_attribute +local traverse_id = node.traverse_id +local remove_node = nodes.remove + +local fontdata = fonts.ids +local state = attributes.private('state') + +local fcs = (fonts.color and fonts.color.set) or function() end +local fcr = (fonts.color and fonts.color.reset) or function() end + +local a_to_script = otf.a_to_script +local a_to_language = otf.a_to_language + +local remove_node = node.remove +local delete_node = nodes.delete +local insert_node_after = node.insert_after +local insert_node_before = node.insert_before +local traverse_node_list = node.traverse + +-- in the future we will use language/script attributes instead of the +-- font related value, but then we also need dynamic features which is +-- somewhat slower; and .. we need a chain of them + + +function fonts.initializers.node.otf.analyze(tfmdata,value,attr) + if attr and attr > 0 then + script, language = a_to_script[attr], a_to_language[attr] + else + script, language = tfmdata.script, tfmdata.language + end + local action = initializers[script] + if action then + if type(action) == "function" then + return action(tfmdata,value) + else + local action = action[language] + if action then + return action(tfmdata,value) + end + end + end + return nil +end + +function fonts.methods.node.otf.analyze(head,font,attr) + local tfmdata = fontdata[font] + local script, language + if attr and attr > 0 then + script, language = a_to_script[attr], a_to_language[attr] + else + script, language = tfmdata.script, tfmdata.language + end + local action = methods[script] + if action then + if type(action) == "function" then + return action(head,font,attr) + else + action = action[language] + if action then + return action(head,font,attr) + end + end + end + return head, false +end + +otf.features.register("analyze",true) -- we always analyze +table.insert(fonts.triggers,"analyze") -- we need a proper function for doing this + +-- latin + +fonts.analyzers.methods.latn = fonts.analyzers.aux.setstate + +-- this info eventually will go into char-def + +local zwnj = 0x200C +local zwj = 0x200D + +local isol = { + [0x0600] = true, [0x0601] = true, [0x0602] = true, [0x0603] = true, + [0x0608] = true, [0x060B] = true, [0x0621] = true, [0x0674] = true, + [0x06DD] = true, [zwnj] = true, +} + +local isol_fina = { + [0x0622] = true, [0x0623] = true, [0x0624] = true, [0x0625] = true, + [0x0627] = true, [0x0629] = true, [0x062F] = true, [0x0630] = true, + [0x0631] = true, [0x0632] = true, [0x0648] = true, [0x0671] = true, + [0x0672] = true, [0x0673] = true, [0x0675] = true, [0x0676] = true, + [0x0677] = true, [0x0688] = true, [0x0689] = true, [0x068A] = true, + [0x068B] = true, [0x068C] = true, [0x068D] = true, [0x068E] = true, + [0x068F] = true, [0x0690] = true, [0x0691] = true, [0x0692] = true, + [0x0693] = true, [0x0694] = true, [0x0695] = true, [0x0696] = true, + [0x0697] = true, [0x0698] = true, [0x0699] = true, [0x06C0] = true, + [0x06C3] = true, [0x06C4] = true, [0x06C5] = true, [0x06C6] = true, + [0x06C7] = true, [0x06C8] = true, [0x06C9] = true, [0x06CA] = true, + [0x06CB] = true, [0x06CD] = true, [0x06CF] = true, [0x06D2] = true, + [0x06D3] = true, [0x06D5] = true, [0x06EE] = true, [0x06EF] = true, + [0x0759] = true, [0x075A] = true, [0x075B] = true, [0x076B] = true, + [0x076C] = true, [0x0771] = true, [0x0773] = true, [0x0774] = true, + [0x0778] = true, [0x0779] = true, +} + +local isol_fina_medi_init = { + [0x0626] = true, [0x0628] = true, [0x062A] = true, [0x062B] = true, + [0x062C] = true, [0x062D] = true, [0x062E] = true, [0x0633] = true, + [0x0634] = true, [0x0635] = true, [0x0636] = true, [0x0637] = true, + [0x0638] = true, [0x0639] = true, [0x063A] = true, [0x063B] = true, + [0x063C] = true, [0x063D] = true, [0x063E] = true, [0x063F] = true, + [0x0640] = true, [0x0641] = true, [0x0642] = true, [0x0643] = true, + [0x0644] = true, [0x0645] = true, [0x0646] = true, [0x0647] = true, + [0x0649] = true, [0x064A] = true, [0x066E] = true, [0x066F] = true, + [0x0678] = true, [0x0679] = true, [0x067A] = true, [0x067B] = true, + [0x067C] = true, [0x067D] = true, [0x067E] = true, [0x067F] = true, + [0x0680] = true, [0x0681] = true, [0x0682] = true, [0x0683] = true, + [0x0684] = true, [0x0685] = true, [0x0686] = true, [0x0687] = true, + [0x069A] = true, [0x069B] = true, [0x069C] = true, [0x069D] = true, + [0x069E] = true, [0x069F] = true, [0x06A0] = true, [0x06A1] = true, + [0x06A2] = true, [0x06A3] = true, [0x06A4] = true, [0x06A5] = true, + [0x06A6] = true, [0x06A7] = true, [0x06A8] = true, [0x06A9] = true, + [0x06AA] = true, [0x06AB] = true, [0x06AC] = true, [0x06AD] = true, + [0x06AE] = true, [0x06AF] = true, [0x06B0] = true, [0x06B1] = true, + [0x06B2] = true, [0x06B3] = true, [0x06B4] = true, [0x06B5] = true, + [0x06B6] = true, [0x06B7] = true, [0x06B8] = true, [0x06B9] = true, + [0x06BA] = true, [0x06BB] = true, [0x06BC] = true, [0x06BD] = true, + [0x06BE] = true, [0x06BF] = true, [0x06C1] = true, [0x06C2] = true, + [0x06CC] = true, [0x06CE] = true, [0x06D0] = true, [0x06D1] = true, + [0x06FA] = true, [0x06FB] = true, [0x06FC] = true, [0x06FF] = true, + [0x0750] = true, [0x0751] = true, [0x0752] = true, [0x0753] = true, + [0x0754] = true, [0x0755] = true, [0x0756] = true, [0x0757] = true, + [0x0758] = true, [0x075C] = true, [0x075D] = true, [0x075E] = true, + [0x075F] = true, [0x0760] = true, [0x0761] = true, [0x0762] = true, + [0x0763] = true, [0x0764] = true, [0x0765] = true, [0x0766] = true, + [0x0767] = true, [0x0768] = true, [0x0769] = true, [0x076A] = true, + [0x076D] = true, [0x076E] = true, [0x076F] = true, [0x0770] = true, + [0x0772] = true, [0x0775] = true, [0x0776] = true, [0x0777] = true, + [0x077A] = true, [0x077B] = true, [0x077C] = true, [0x077D] = true, + [0x077E] = true, [0x077F] = true, [zwj] = true, +} + +local arab_warned = { } + +-- todo: gref + +local function warning(current,what) + local char = current.char + if not arab_warned[char] then + log.report("analyze","arab: character %s (U+%04X) has no %s class", char, char, what) + arab_warned[char] = true + end +end + +function fonts.analyzers.methods.nocolor(head,font,attr) + for n in traverse_node_list(head,glyph) do + if not font or n.font == font then + fcr(n) + end + end + return head, true +end + +otf.remove_joiners = false -- true -- for idris who want it as option + +local function finish(first,last) + if last then + if first == last then + local fc = first.char + if isol_fina_medi_init[fc] or isol_fina[fc] then + set_attribute(first,state,4) -- isol + if trace_analyzing then fcs(first,"font:isol") end + else + warning(first,"isol") + set_attribute(first,state,0) -- error + if trace_analyzing then fcr(first) end + end + else + local lc = last.char + if isol_fina_medi_init[lc] or isol_fina[lc] then -- why isol here ? + -- if laststate == 1 or laststate == 2 or laststate == 4 then + set_attribute(last,state,3) -- fina + if trace_analyzing then fcs(last,"font:fina") end + else + warning(last,"fina") + set_attribute(last,state,0) -- error + if trace_analyzing then fcr(last) end + end + end + first, last = nil, nil + elseif first then + -- first and last are either both set so we never com here + local fc = first.char + if isol_fina_medi_init[fc] or isol_fina[fc] then + set_attribute(first,state,4) -- isol + if trace_analyzing then fcs(first,"font:isol") end + else + warning(first,"isol") + set_attribute(first,state,0) -- error + if trace_analyzing then fcr(first) end + end + first = nil + end + return first, last +end + +function fonts.analyzers.methods.arab(head,font,attr) -- maybe make a special version with no trace + local tfmdata = fontdata[font] +--~ local marks = tfmdata.shared.otfdata.luatex.marks + local marks = tfmdata.marks + local first, last, current, done = nil, nil, head, false + local removejoiners = otf.remove_joiners + local joiners = { } + while current do + if current.id == glyph and current.subtype<256 and current.font == font and not has_attribute(current,state) then + done = true + local char = current.char + if removejoiners and char == zwj or char == zwnj then + joiners[#joiners+1] = current + end + if marks[char] then + set_attribute(current,state,5) -- mark + if trace_analyzing then fcs(current,"font:mark") end + elseif isol[char] then -- can be zwj or zwnj too + first, last = finish(first,last) + set_attribute(current,state,4) -- isol + if trace_analyzing then fcs(current,"font:isol") end + first, last = nil, nil + elseif not first then + if isol_fina_medi_init[char] then + set_attribute(current,state,1) -- init + if trace_analyzing then fcs(current,"font:init") end + first, last = first or current, current + elseif isol_fina[char] then + set_attribute(current,state,4) -- isol + if trace_analyzing then fcs(current,"font:isol") end + first, last = nil, nil + else -- no arab + first, last = finish(first,last) + end + elseif isol_fina_medi_init[char] then + first, last = first or current, current + set_attribute(current,state,2) -- medi + if trace_analyzing then fcs(current,"font:medi") end + elseif isol_fina[char] then + if not has_attribute(last,state,1) then + -- tricky, we need to check what last may be ! + set_attribute(last,state,2) -- medi + if trace_analyzing then fcs(last,"font:medi") end + end + set_attribute(current,state,3) -- fina + if trace_analyzing then fcs(current,"font:fina") end + first, last = nil, nil + elseif char >= 0x0600 and char <= 0x06FF then + if trace_analyzing then fcs(current,"font:rest") end + first, last = finish(first,last) + else --no + first, last = finish(first,last) + end + else + first, last = finish(first,last) + end + current = current.next + end + first, last = finish(first,last) + if removejoiners then + for i=1,#joiners do + head = delete_node(head,joiners[i]) -- was remove so no free + end + end + return head, done +end |