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-rw-r--r--otfl-font-ota.lua305
1 files changed, 305 insertions, 0 deletions
diff --git a/otfl-font-ota.lua b/otfl-font-ota.lua
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--- /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