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| author | Elie Roux <elie.roux@telecom-bretagne.eu> | 2013-04-18 18:09:20 +0200 |
|---|---|---|
| committer | Elie Roux <elie.roux@telecom-bretagne.eu> | 2013-04-18 18:09:20 +0200 |
| commit | a9510469b60edeceedf72811e7737ea0f3c56dc5 (patch) | |
| tree | 5c7a80ce3a0c2f1d22c12bff36f84355df554c46 /otfl-font-otn.lua | |
| parent | e67643a60422ed265dc5ad8955a83140598385f1 (diff) | |
| parent | b0c22678d1f776f991ffef67694451b8bb5f9e20 (diff) | |
| download | luaotfload-a9510469b60edeceedf72811e7737ea0f3c56dc5.tar.gz | |
Merge branch 'experimental' of phi-gamma/luaotfload into phi-gamma-experimental
Conflicts:
mkluatexfontdb.lua
otfl-basics-gen.lua
Diffstat (limited to 'otfl-font-otn.lua')
| -rw-r--r-- | otfl-font-otn.lua | 2712 |
1 files changed, 0 insertions, 2712 deletions
diff --git a/otfl-font-otn.lua b/otfl-font-otn.lua deleted file mode 100644 index 8e67597..0000000 --- a/otfl-font-otn.lua +++ /dev/null @@ -1,2712 +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 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: --- --- kerning is probably not yet ok for latin around dics nodes --- 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) - ---[[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>Because there are different interpretations possible, I will extend the code -with more (configureable) variants. I can also add hooks for users so that they can -write their own extensions.</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 chainmore comment --- --- gsub_single ok ok ok --- gsub_multiple ok ok not implemented yet --- gsub_alternate ok ok not implemented yet --- gsub_ligature ok 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 --- remark: we need to check what to do with discretionaries - --- 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. - -local concat, insert, remove = table.concat, table.insert, table.remove -local format, gmatch, gsub, find, match, lower, strip = string.format, string.gmatch, string.gsub, string.find, string.match, string.lower, string.strip -local type, next, tonumber, tostring = type, next, tonumber, tostring -local lpegmatch = lpeg.match -local random = math.random - -local logs, trackers, nodes, attributes = logs, trackers, nodes, attributes - -local registertracker = trackers.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 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") - -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 insert_node_after = node.insert_after -local delete_node = nodes.delete -local copy_node = node.copy -local find_node_tail = node.tail or node.slide -local set_attribute = node.set_attribute -local has_attribute = node.has_attribute -local flush_node_list = node.flush_list - -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 glyph_code = nodecodes.glyph -local glue_code = nodecodes.glue -local disc_code = nodecodes.disc -local whatsit_code = nodecodes.whatsit - -local dir_code = whatcodes.dir -local localpar_code = whatcodes.localpar - -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 bases in 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 state = privateattribute('state') -local markbase = privateattribute('markbase') -local markmark = privateattribute('markmark') -local markdone = privateattribute('markdone') -- assigned at the injection end -local cursbase = privateattribute('cursbase') -local curscurs = privateattribute('curscurs') -local cursdone = privateattribute('cursdone') -local kernpair = privateattribute('kernpair') -local ligacomp = privateattribute('ligacomp') -- assigned here (ideally it should be combined) - -local injections = nodes.injections -local setmark = injections.setmark -local setcursive = injections.setcursive -local setkern = injections.setkern -local setpair = injections.setpair - -local markonce = true -local cursonce = true -local kernonce = true - -local fonthashes = fonts.hashes -local fontdata = fonthashes.identifiers - -local otffeatures = fonts.constructors.newfeatures("otf") -local registerotffeature = otffeatures.register - -local onetimemessage = fonts.loggers.onetimemessage - -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 handlers = { } -local rlmode = 0 -local featurevalue = false - --- we cannot optimize with "start = first_glyph(head)" because then we don't --- know which rlmode we're in which messes up cursive handling later on --- --- head is always a whatsit so we can safely assume that head is not changed - --- 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 function gref(n) - if type(n) == "number" then - local description = descriptions[n] - local name = description and description.name - if name then - return format("U+%05X (%s)",n,name) - else - return format("U+%05X",n) - end - elseif not n then - return "<error in tracing>" - else - 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] = format("U+%05X",ni) - nam[i] = di and di.name or "?" - end - end - return format("%s (%s)",concat(num," "), concat(nam," ")) - end -end - -local function cref(kind,chainname,chainlookupname,lookupname,index) - if index then - return format("feature %s, chain %s, sub %s, lookup %s, index %s",kind,chainname,chainlookupname,lookupname,index) - elseif lookupname then - return format("feature %s, chain %s, sub %s, lookup %s",kind,chainname or "?",chainlookupname or "?",lookupname) - elseif chainlookupname then - return format("feature %s, chain %s, sub %s",kind,chainname or "?",chainlookupname) - elseif chainname then - return format("feature %s, chain %s",kind,chainname) - else - return format("feature %s",kind) - end -end - -local function pref(kind,lookupname) - return format("feature %s, lookup %s",kind,lookupname) -end - --- we can assume that languages that use marks are not hyphenated --- we can also assume that at most one discretionary is present - -local function markstoligature(kind,lookupname,start,stop,char) - local n = copy_node(start) - local keep = start - local current - current, start = insert_node_after(start,start,n) - local snext = stop.next - current.next = snext - if snext then - snext.prev = current - end - start.prev, stop.next = nil, nil - current.char, current.subtype, current.components = char, ligature_code, start - return keep -end - -local function toligature(kind,lookupname,start,stop,char,markflag,discfound) -- brr head - if start == stop then - start.char = char - return start - elseif discfound then - -- print("start->stop",nodes.tosequence(start,stop)) - local components = start.components - if components then - flush_node_list(components) - start.components = nil - end - local lignode = copy_node(start) - lignode.font = start.font - lignode.char = char - lignode.subtype = ligature_code - local next = stop.next - local prev = start.prev - stop.next = nil - start.prev = nil - lignode.components = start - -- print("lignode",nodes.tosequence(lignode)) - -- print("components",nodes.tosequence(lignode.components)) - prev.next = lignode - if next then - next.prev = lignode - end - lignode.next = next - lignode.prev = prev - -- print("start->end",nodes.tosequence(start)) - return lignode - else - -- start is the ligature - local deletemarks = markflag ~= "mark" - local n = copy_node(start) - local current - current, start = insert_node_after(start,start,n) - local snext = stop.next - current.next = snext - if snext then - snext.prev = current - end - start.prev = nil - stop.next = nil - current.char = char - current.subtype = ligature_code - current.components = start - local head = current - -- this is messy ... we should get rid of the components eventually - local i = 0 -- is index of base - while start do - if not marks[start.char] then - i = i + 1 - elseif not deletemarks then -- quite fishy - set_attribute(start,ligacomp,i) - if trace_marks then - logwarning("%s: keep mark %s, gets index %s",pref(kind,lookupname),gref(start.char),i) - end - head, current = insert_node_after(head,current,copy_node(start)) - end - start = start.next - end - start = current.next - while start and start.id == glyph_code do - if marks[start.char] then - set_attribute(start,ligacomp,i) - if trace_marks then - logwarning("%s: keep mark %s, gets index %s",pref(kind,lookupname),gref(start.char),i) - end - else - break - end - start = start.next - end - -- - -- 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 - -- - -- flush_node_list(head.components) - return head - end -end - -function handlers.gsub_single(start,kind,lookupname,replacement) - if trace_singles then - logprocess("%s: replacing %s by single %s",pref(kind,lookupname),gref(start.char),gref(replacement)) - end - start.char = replacement - return start, true -end - -local function get_alternative_glyph(start,alternatives,value) - -- needs checking: (global value, brrr) - local choice = nil - local n = #alternatives - local char = start.char - -- - if value == "random" then - local r = random(1,n) - value, choice = format("random, choice %s",r), alternatives[r] - elseif value == "first" then - value, choice = format("first, choice %s",1), alternatives[1] - elseif value == "last" then - value, choice = format("last, choice %s",n), alternatives[n] - else - value = tonumber(value) - if type(value) ~= "number" then - value, choice = "default, choice 1", alternatives[1] - elseif value > n then - local defaultalt = otf.defaultnodealternate - if defaultalt == "first" then - value, choice = format("no %s variants, taking %s",value,n), alternatives[n] - elseif defaultalt == "last" then - value, choice = format("no %s variants, taking %s",value,1), alternatives[1] - else - value, choice = format("no %s variants, ignoring",value), false - end - elseif value == 0 then - value, choice = format("choice %s (no change)",value), char - elseif value < 1 then - value, choice = format("no %s variants, taking %s",value,1), alternatives[1] - else - value, choice = format("choice %s",value), alternatives[value] - end - end - return choice -end - -local function multiple_glyphs(start,multiple) -- marks ? - local nofmultiples = #multiple - if nofmultiples > 0 then - start.char = multiple[1] - if nofmultiples > 1 then - local sn = start.next - for k=2,nofmultiples do -- todo: use insert_node - local n = copy_node(start) - n.char = multiple[k] - n.next = sn - n.prev = start - if sn then - sn.prev = n - end - start.next = n - start = n - end - end - return start, true - else - if trace_multiples then - logprocess("no multiple for %s",gref(start.char)) - end - return start, false - end -end - -function handlers.gsub_alternate(start,kind,lookupname,alternative,sequence) - local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue - local choice = get_alternative_glyph(start,alternative,value) - if choice then - if trace_alternatives then - logprocess("%s: replacing %s by alternative %s (%s)",pref(kind,lookupname),gref(char),gref(choice),choice) - end - start.char = choice - else - if trace_alternatives then - logwarning("%s: no variant %s for %s",pref(kind,lookupname),tostring(value),gref(char)) - end - end - return start, true -end - -function handlers.gsub_multiple(start,kind,lookupname,multiple) - if trace_multiples then - logprocess("%s: replacing %s by multiple %s",pref(kind,lookupname),gref(start.char),gref(multiple)) - end - return multiple_glyphs(start,multiple) -end - -function handlers.gsub_ligature(start,kind,lookupname,ligature,sequence) - local s, stop, discfound = start.next, nil, false - local startchar = start.char - if marks[startchar] then - while s do - local id = s.id - if id == glyph_code and s.subtype<256 and s.font == currentfont then - local lg = ligature[s.char] - if lg then - stop = s - ligature = lg - s = s.next - else - break - end - else - break - end - end - if stop then - local lig = ligature.ligature - if lig then - if trace_ligatures then - local stopchar = stop.char - start = markstoligature(kind,lookupname,start,stop,lig) - logprocess("%s: replacing %s upto %s by ligature %s",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(start.char)) - else - start = markstoligature(kind,lookupname,start,stop,lig) - end - return start, true - else - -- ok, goto next lookup - end - end - else - local skipmark = sequence.flags[1] - while s do - local id = s.id - if id == glyph_code and s.subtype<256 then - if s.font == currentfont then - local char = s.char - if skipmark and marks[char] then - s = s.next - else - local lg = ligature[char] - if lg then - stop = s - ligature = lg - s = s.next - else - break - end - end - else - break - end - elseif id == disc_code then - discfound = true - s = s.next - else - break - end - end - if stop then - local lig = ligature.ligature - if lig then - if trace_ligatures then - local stopchar = stop.char - start = toligature(kind,lookupname,start,stop,lig,skipmark,discfound) - logprocess("%s: replacing %s upto %s by ligature %s",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(start.char)) - else - start = toligature(kind,lookupname,start,stop,lig,skipmark,discfound) - end - return start, true - else - -- ok, goto next lookup - end - end - end - return start, false -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(start,kind,lookupname,markanchors,sequence) - local markchar = start.char - if marks[markchar] then - local base = start.prev -- [glyph] [start=mark] - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - local basechar = base.char - if marks[basechar] then - while true do - base = base.prev - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - basechar = base.char - 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 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) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%s,%s)", - pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return 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 - else -- if 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 start, false -end - -function handlers.gpos_mark2ligature(start,kind,lookupname,markanchors,sequence) - -- check chainpos variant - local markchar = start.char - if marks[markchar] then - local base = start.prev -- [glyph] [optional marks] [start=mark] - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - local basechar = base.char - if marks[basechar] then - while true do - base = base.prev - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - basechar = base.char - 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 start, false - end - end - end - local index = has_attribute(start,ligacomp) - 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) -- index - if trace_marks then - logprocess("%s, anchor %s, index %s, bound %s: anchoring mark %s to baselig %s at index %s => (%s,%s)", - pref(kind,lookupname),anchor,index,bound,gref(markchar),gref(basechar),index,dx,dy) - end - return start, true - 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 - else -- if 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 start, false -end - -function handlers.gpos_mark2mark(start,kind,lookupname,markanchors,sequence) - local markchar = start.char - if marks[markchar] then - local base = start.prev -- [glyph] [basemark] [start=mark] - -- while base and has_attribute(base,ligacomp) and has_attribute(base,ligacomp) ~= has_attribute(start,ligacomp) do - -- base = base.prev -- KE: prevents mkmk for marks on different components of a ligature - -- end - local slc = has_attribute(start,ligacomp) - if slc then -- a rather messy loop ... needs checking with husayni - while base do - local blc = has_attribute(base,ligacomp) - if blc and blc ~= slc then - base = base.prev - else - break - end - end - end - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then -- subtype test can go - local basechar = base.char - 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) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%s,%s)", - pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return 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 - else -- if 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 start,false -end - -function handlers.gpos_cursive(start,kind,lookupname,exitanchors,sequence) -- to be checked - local alreadydone = cursonce and has_attribute(start,cursbase) - if not alreadydone then - local done = false - local startchar = start.char - if marks[startchar] then - if trace_cursive then - logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar)) - end - else - local nxt = start.next - while not done and nxt and nxt.id == glyph_code and nxt.subtype<256 and nxt.font == currentfont do - local nextchar = nxt.char - if marks[nextchar] then - -- should not happen (maybe warning) - nxt = nxt.next - 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 (%s,%s) 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 - else -- if 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 start, done - else - if trace_cursive and trace_details then - logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(start.char),alreadydone) - end - return start, false - end -end - -function handlers.gpos_single(start,kind,lookupname,kerns,sequence) - local startchar = start.char - 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 (%s,%s) and correction (%s,%s)",pref(kind,lookupname),gref(startchar),dx,dy,w,h) - end - return start, false -end - -function handlers.gpos_pair(start,kind,lookupname,kerns,sequence) - -- todo: kerns in disc nodes: pre, post, replace -> loop over disc too - -- todo: kerns in components of ligatures - local snext = start.next - if not snext then - return start, false - else - local prev, done = start, false - local factor = tfmdata.parameters.factor - local lookuptype = lookuptypes[lookupname] - while snext and snext.id == glyph_code and snext.subtype<256 and snext.font == currentfont do - local nextchar = snext.char - local krn = kerns[nextchar] - if not krn and marks[nextchar] then - prev = snext - snext = snext.next - else - local krn = kerns[nextchar] - 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 startchar = start.char - 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 (%s,%s) and correction (%s,%s)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h) - end - end - if b and #b > 0 then - local startchar = start.char - 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 (%s,%s) and correction (%s,%s)",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(prev.char),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) - if trace_kerns then - logprocess("%s: inserting kern %s between %s and %s",pref(kind,lookupname),k,gref(prev.char),gref(nextchar)) - end - done = true - end - break - end - end - return start, done - 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 chainmores = { } -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(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname) - logwarning("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname)) - return start, false -end - -function chainmores.chainsub(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname,n) - logprocess("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname)) - return 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(start,stop,kind,chainname,currentcontext,lookuphash,replacements) - local char = start.char - 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 - start.char = replacement - return start, true - else - return 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(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 = start.next - if not marks[next.char] then - delete_node(start,next) - end - n = n + 1 - until next == stop - else -- start x x x stop => start - repeat - local next = start.next - delete_node(start,next) - n = n + 1 - until next == stop - end - return n -end - ---[[ldx-- -<p>Here we replace start by a single variant, First we delete the rest of the -match.</p> ---ldx]]-- - -function chainprocs.gsub_single(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: %s",concat(subtables," ")) - end - while current do - if current.id == glyph_code then - local currentchar = current.char - 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 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 - current.char = replacement - end - end - return start, true - elseif current == stop then - break - else - current = current.next - end - end - return start, false -end - -chainmores.gsub_single = chainprocs.gsub_single - ---[[ldx-- -<p>Here we replace start by a sequence of new glyphs. First we delete the rest of -the match.</p> ---ldx]]-- - -function chainprocs.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - delete_till_stop(start,stop) -- we could pass ignoremarks as #3 .. - local startchar = start.char - 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 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(start,replacements) - end - end - return start, false -end - --- function chainmores.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n) --- logprocess("%s: gsub_multiple not yet supported",cref(kind,chainname,chainlookupname)) --- return start, false --- end - -chainmores.gsub_multiple = chainprocs.gsub_multiple - ---[[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(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 current.id == glyph_code then -- is this check needed? - local currentchar = current.char - 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 = get_alternative_glyph(current,alternatives,value) - if choice then - if trace_alternatives then - logprocess("%s: replacing %s by alternative %s (%s)",cref(kind,chainname,chainlookupname,lookupname),gref(char),gref(choice),choice) - end - start.char = choice - else - if trace_alternatives then - logwarning("%s: no variant %s for %s",cref(kind,chainname,chainlookupname,lookupname),tostring(value),gref(char)) - end - end - elseif trace_bugs then - logwarning("%s: no alternative for %s",cref(kind,chainname,chainlookupname,lookupname),gref(currentchar)) - end - end - return start, true - elseif current == stop then - break - else - current = current.next - end - end - return start, false -end - --- function chainmores.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n) --- logprocess("%s: gsub_alternate not yet supported",cref(kind,chainname,chainlookupname)) --- return start, false --- end - -chainmores.gsub_alternate = chainprocs.gsub_alternate - ---[[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(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex) - local startchar = start.char - 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, discfound, last, nofreplacements = start.next, false, stop, 0 - while s do - local id = s.id - if id == disc_code then - s = s.next - discfound = true - else - local schar = s.char - if marks[schar] then -- marks - s = s.next - else - local lg = ligatures[schar] - if lg then - ligatures, last, nofreplacements = lg, s, nofreplacements + 1 - if s == stop then - break - else - s = s.next - 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",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(l2)) - else - logprocess("%s: replacing character %s upto %s by ligature %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(stop.char),gref(l2)) - end - end - start = toligature(kind,lookupname,start,stop,l2,currentlookup.flags[1],discfound) - return start, true, nofreplacements - 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(stop.char)) - end - end - end - end - return start, false, 0 -end - -chainmores.gsub_ligature = chainprocs.gsub_ligature - -function chainprocs.gpos_mark2base(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local markchar = start.char - 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 = start.prev -- [glyph] [start=mark] - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - local basechar = base.char - if marks[basechar] then - while true do - base = base.prev - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - basechar = base.char - 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 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) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%s,%s)", - cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return 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 start, false -end - -function chainprocs.gpos_mark2ligature(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local markchar = start.char - 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 = start.prev -- [glyph] [optional marks] [start=mark] - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - local basechar = base.char - if marks[basechar] then - while true do - base = base.prev - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then - basechar = base.char - 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 start, false - end - end - end - -- todo: like marks a ligatures hash - local index = has_attribute(start,ligacomp) - 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) -- index - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to baselig %s at index %s => (%s,%s)", - cref(kind,chainname,chainlookupname,lookupname),anchor,a or bound,gref(markchar),gref(basechar),index,dx,dy) - end - return 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 start, false -end - -function chainprocs.gpos_mark2mark(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local markchar = start.char - if marks[markchar] then ---~ local alreadydone = markonce and has_attribute(start,markmark) ---~ if not alreadydone 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 = start.prev -- [glyph] [basemark] [start=mark] - -- while (base and has_attribute(base,ligacomp) and has_attribute(base,ligacomp) ~= has_attribute(start,ligacomp)) do - -- base = base.prev -- KE: prevents mkmk for marks on different components of a ligature - -- end - local slc = has_attribute(start,ligacomp) - if slc then -- a rather messy loop ... needs checking with husayni - while base do - local blc = has_attribute(base,ligacomp) - if blc and blc ~= slc then - base = base.prev - else - break - end - end - end - if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then -- subtype test can go - local basechar = base.char - 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) - if trace_marks then - logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%s,%s)", - cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy) - end - return 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_marks and trace_details then ---~ logprocess("%s, mark %s is already bound (n=%s), ignoring mark2mark",pref(kind,lookupname),gref(markchar),alreadydone) ---~ end - elseif trace_bugs then - logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar)) - end - return start, false -end - --- ! ! ! untested ! ! ! - -function chainprocs.gpos_cursive(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname) - local alreadydone = cursonce and has_attribute(start,cursbase) - if not alreadydone then - local startchar = start.char - 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 = start.next - while not done and nxt and nxt.id == glyph_code and nxt.subtype<256 and nxt.font == currentfont do - local nextchar = nxt.char - if marks[nextchar] then - -- should not happen (maybe warning) - nxt = nxt.next - 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 (%s,%s) 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 - else -- if 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 start, done - else - if trace_cursive and trace_details then - logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(start.char),alreadydone) - end - return start, false - end - end - return start, false -end - -function chainprocs.gpos_single(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence) - -- untested .. needs checking for the new model - local startchar = start.char - 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 (%s,%s) and correction (%s,%s)",cref(kind,chainname,chainlookupname),gref(startchar),dx,dy,w,h) - end - end - end - return start, false -end - --- when machines become faster i will make a shared function - -function chainprocs.gpos_pair(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence) --- logwarning("%s: gpos_pair not yet supported",cref(kind,chainname,chainlookupname)) - local snext = start.next - if snext then - local startchar = start.char - 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 snext.id == glyph_code and snext.subtype<256 and snext.font == currentfont do - local nextchar = snext.char - local krn = kerns[nextchar] - if not krn and marks[nextchar] then - prev = snext - snext = snext.next - 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 = start.char - 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 (%s,%s) and correction (%s,%s)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h) - end - end - if b and #b > 0 then - local startchar = start.char - 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 (%s,%s) and correction (%s,%s)",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(prev.char),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(prev.char),gref(nextchar)) - end - done = true - end - break - end - end - return start, done - end - end - end - return 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 (%s) in rule %s, lookuptype %s (%s=>%s)",cref(kind,chainname),gref(char),class,ck[1],ck[2],ck[9],ck[10]) - else - logwarning("%s: skipping char %s (%s) in rule %s, lookuptype %s",cref(kind,chainname),gref(char),class,ck[1],ck[2]) - end -end - -local function normal_handle_contextchain(start,kind,chainname,contexts,sequence,lookuphash) - -- local rule, lookuptype, sequence, f, l, lookups = ck[1], ck[2] ,ck[3], ck[4], ck[5], ck[6] - local flags = sequence.flags - local done = false - local skipmark = flags[1] - local skipligature = flags[2] - local skipbase = flags[3] - local someskip = skipmark or skipligature or skipbase -- could be stored in flags for a fast test (hm, flags could be false !) - local markclass = sequence.markclass -- todo, first we need a proper test - local skipped = false - for k=1,#contexts do - 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 = current.id == glyph_code and current.subtype<256 and current.font == currentfont and seq[1][current.char] - 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, l = ck[4], 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 n = f + 1 - last = last.next - while n <= l do - if last then - local id = last.id - if id == glyph_code then - if last.subtype<256 and last.font == currentfont then - local char = last.char - 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 - last = last.next - elseif seq[n][char] then - if n < l then - last = last.next - end - n = n + 1 - else - match = false - break - end - else - match = false - break - end - else - match = false - break - end - elseif id == disc_code then - last = last.next - else - match = false - break - end - else - match = false - break - end - end - end - end - -- before - if match and f > 1 then - local prev = start.prev - if prev then - local n = f-1 - while n >= 1 do - if prev then - local id = prev.id - if id == glyph_code then - if prev.subtype<256 and prev.font == currentfont then -- normal char - local char = prev.char - 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 - match = false - break - end - else - match = false - break - end - else - match = false - break - end - elseif id == disc_code then - -- skip 'm - elseif seq[n][32] then - n = n -1 - else - match = false - break - end - prev = prev.prev - elseif seq[n][32] then -- somehat special, as zapfino can have many preceding spaces - n = n -1 - else - match = false - break - end - end - elseif f == 2 then - match = seq[1][32] - else - for n=f-1,1 do - if not seq[n][32] then - match = false - break - end - end - end - end - -- after - if match and s > l then - local current = last and last.next - if current then - -- 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 = current.id - if id == glyph_code then - if current.subtype<256 and current.font == currentfont then -- normal char - local char = current.char - 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 - match = false - break - end - else - match = false - break - end - else - match = false - break - end - elseif id == disc_code then - -- skip 'm - elseif seq[n][32] then -- brrr - n = n + 1 - else - match = false - break - end - current = current.next - elseif seq[n][32] then - n = n + 1 - else - match = false - break - end - end - elseif s-l == 1 then - match = seq[s][32] - else - for n=l+1,s do - if not seq[n][32] then - match = false - break - end - end - end - end - end - if match then - -- ck == currentcontext - if trace_contexts then - local rule, lookuptype, f, l = ck[1], ck[2], ck[4], ck[5] - local char = start.char - if ck[9] then - logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %s (%s=>%s)", - 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 %s", - 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 cp = chainprocs[chainlookup.type] - if cp then - start, done = cp(start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence) - 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 - repeat - if skipped then - while true do - local char = start.char - 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 - start = start.next - else - break - end - else - break - end - end - end - local chainlookupname = chainlookups[i] - local chainlookup = lookuptable[chainlookupname] -- can be false (n matches, <n replacement) - local cp = chainlookup and chainmores[chainlookup.type] - if cp then - local ok, n - start, ok, n = cp(start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,i,sequence) - -- messy since last can be changed ! - if ok then - done = true - -- skip next one(s) if ligature - i = i + (n or 1) - else - i = i + 1 - end - else - -- is valid - -- logprocess("%s: multiple subchains for %s are not yet supported",cref(kind,chainname,chainlookupname),chainlookup and chainlookup.type or "?") - i = i + 1 - end - start = start.next - until i > nofchainlookups - end - else - local replacements = ck[7] - if replacements then - start, done = chainprocs.reversesub(start,last,kind,chainname,ck,lookuphash,replacements) -- sequence - else - done = true -- can be meant to be skipped - if trace_contexts then - logprocess("%s: skipping match",cref(kind,chainname)) - end - end - end - end - end - return 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 '%s'",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 %s of type %s in font %s (%s)",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 special_attributes = { - init = 1, - medi = 2, - fina = 3, - isol = 4 -} - -local function initialize(sequence,script,language,enabled) - local features = sequence.features - if features then - for kind, scripts in next, features do - local valid = enabled[kind] - if valid then - local languages = scripts[script] or scripts[wildcard] - if languages and (languages[language] or languages[wildcard]) then - return { valid, special_attributes[kind] or false, sequence.chain or 0, kind, sequence } - end - end - end - end - return false -end - -function otf.dataset(tfmdata,sequences,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 = { } - rs[language] = rl - setmetatableindex(rl, function(t,k) - local v = enabled and initialize(sequences[k],script,language,enabled) - t[k] = v - return v - end) - end - return rl -end - --- elseif id == glue_code then --- if p[5] then -- chain --- local pc = pp[32] --- if pc then --- start, ok = start, false -- p[1](start,kind,p[2],pc,p[3],p[4]) --- if ok then --- done = true --- end --- if start then start = start.next end --- else --- start = start.next --- end --- else --- start = start.next --- end - -local function featuresprocessor(head,font,attr) - - local lookuphash = lookuphashes[font] -- we can also check sequences here - - if not lookuphash then - return head, false - end - - 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 - - currentfont = font - rlmode = 0 - - local sequences = resources.sequences - local done = false - local datasets = otf.dataset(tfmdata,sequences,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. - - for s=1,#sequences do - local dataset = datasets[s] - if dataset then - featurevalue = dataset[1] -- todo: pass to function instead of using a global - if featurevalue then - local sequence = sequences[s] -- also dataset[5] - local rlparmode = 0 - local topstack = 0 - local success = false - local attribute = dataset[2] - local chain = dataset[3] -- sequence.chain or 0 - local typ = sequence.type - local subtables = sequence.subtables - if chain < 0 then - -- this is a limited case, no special treatments like 'init' etc - local handler = handlers[typ] - -- 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 = start.id - if id == glyph_code then - if start.subtype<256 and start.font == font then - local a = has_attribute(start,0) - if a then - a = a == attr - else - a = true - end - if a then - for i=1,#subtables do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local lookupmatch = lookupcache[start.char] - if lookupmatch then - start, success = handler(start,dataset[4],lookupname,lookupmatch,sequence,lookuphash,i) - if success then - break - end - end - else - report_missing_cache(typ,lookupname) - end - end - if start then start = start.prev end - else - start = start.prev - end - else - start = start.prev - end - else - start = start.prev - end - end - else - local handler = handlers[typ] - 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 - while start do - local id = start.id - if id == glyph_code then - if start.subtype<256 and start.font == font then - local a = has_attribute(start,0) - if a then - a = (a == attr) and (not attribute or has_attribute(start,state,attribute)) - else - a = not attribute or has_attribute(start,state,attribute) - end - if a then - local lookupmatch = lookupcache[start.char] - if lookupmatch then - -- sequence kan weg - local ok - start, ok = handler(start,dataset[4],lookupname,lookupmatch,sequence,lookuphash,1) - if ok then - success = true - end - end - if start then start = start.next end - else - start = start.next - end - else - start = start.next - end - elseif id == whatsit_code then -- will be function - local subtype = start.subtype - if subtype == dir_code then - local dir = start.dir - if dir == "+TRT" or dir == "+TLT" then - topstack = topstack + 1 - dirstack[topstack] = dir - elseif dir == "-TRT" or dir == "-TLT" then - topstack = topstack - 1 - end - local newdir = dirstack[topstack] - if newdir == "+TRT" then - rlmode = -1 - elseif newdir == "+TLT" then - rlmode = 1 - else - rlmode = rlparmode - end - if trace_directions then - report_process("directions after txtdir %s: txtdir=%s:%s, parmode=%s, txtmode=%s",dir,topstack,newdir or "unset",rlparmode,rlmode) - end - elseif subtype == localpar_code then - local dir = start.dir - if dir == "TRT" then - rlparmode = -1 - elseif dir == "TLT" then - rlparmode = 1 - else - rlparmode = 0 - end - rlmode = rlparmode - if trace_directions then - report_process("directions after pardir %s: parmode=%s, txtmode=%s",dir,rlparmode,rlmode) - end - end - start = start.next - else - start = start.next - end - end - end - else - while start do - local id = start.id - if id == glyph_code then - if start.subtype<256 and start.font == font then - local a = has_attribute(start,0) - if a then - a = (a == attr) and (not attribute or has_attribute(start,state,attribute)) - else - a = not attribute or has_attribute(start,state,attribute) - end - if a then - for i=1,ns do - local lookupname = subtables[i] - local lookupcache = lookuphash[lookupname] - if lookupcache then - local lookupmatch = lookupcache[start.char] - if lookupmatch then - -- we could move all code inline but that makes things even more unreadable - local ok - start, ok = handler(start,dataset[4],lookupname,lookupmatch,sequence,lookuphash,i) - if ok then - success = true - break - end - end - else - report_missing_cache(typ,lookupname) - end - end - if start then start = start.next end - else - start = start.next - end - else - start = start.next - end - elseif id == whatsit_code then - local subtype = start.subtype - if subtype == dir_code then - local dir = start.dir - if dir == "+TRT" or dir == "+TLT" then - topstack = topstack + 1 - dirstack[topstack] = dir - elseif dir == "-TRT" or dir == "-TLT" then - topstack = topstack - 1 - end - local newdir = dirstack[topstack] - if newdir == "+TRT" then - rlmode = -1 - elseif newdir == "+TLT" then - rlmode = 1 - else - rlmode = rlparmode - end - if trace_directions then - report_process("directions after txtdir %s: txtdir=%s:%s, parmode=%s, txtmode=%s",dir,topstack,newdir or "unset",rlparmode,rlmode) - end - elseif subtype == localpar_code then - local dir = start.dir - if dir == "TRT" then - rlparmode = -1 - elseif dir == "TLT" then - rlparmode = 1 - else - rlparmode = 0 - end - rlmode = rlparmode - if trace_directions then - report_process("directions after pardir %s: parmode=%s, txtmode=%s",dir,rlparmode,rlmode) - end - end - start = start.next - else - start = start.next - end - end - end - end - if success then - done = true - end - if trace_steps then -- ? - registerstep(head) - end - end - end - end - return head, done -end - -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 action = { - - substitution = generic, - multiple = generic, - alternate = generic, - position = generic, - - ligature = function(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, - - pair = function(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 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 - - -- 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 - - 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) - 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) - 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 - -local function split(replacement,original) - local result = { } - for i=1,#replacement do - result[original[i]] = replacement[i] - end - return result -end - --- not shared as we hook into lookups now - ---~ local function uncover_1(covers,result) -- multiple covers ---~ local nofresults = #result ---~ for n=1,#covers do ---~ nofresults = nofresults + 1 ---~ local u = { } ---~ local c = covers[n] ---~ for i=1,#c do ---~ u[c[i]] = true ---~ end ---~ result[nofresults] = u ---~ end ---~ end - ---~ local function uncover_2(covers,result) -- single covers (turned into multiple with n=1) ---~ local nofresults = #result ---~ for n=1,#covers do ---~ nofresults = nofresults + 1 ---~ result[nofresults] = { [covers[n]] = true } ---~ end ---~ end - ---~ local function uncover_1(covers,result) -- multiple covers ---~ local nofresults = #result ---~ for n=1,#covers do ---~ nofresults = nofresults + 1 ---~ result[nofresults] = covers[n] ---~ end ---~ end - ---~ local function prepare_contextchains(tfmdata) ---~ local rawdata = tfmdata.shared.rawdata ---~ local resources = rawdata.resources ---~ local lookuphash = resources.lookuphash ---~ local lookups = rawdata.lookups ---~ if lookups then ---~ for lookupname, lookupdata in next, rawdata.lookups do ---~ local lookuptype = lookupdata.type ---~ if not lookuptype then ---~ report_prepare("missing lookuptype for %s",lookupname) ---~ else -- => lookuphash[lookupname][unicode] ---~ local rules = lookupdata.rules ---~ if rules then ---~ local fmt = lookupdata.format ---~ -- if fmt == "coverage" then ---~ if fmt == "coverage" or fmt == "glyphs" then ---~ if lookuptype ~= "chainsub" and lookuptype ~= "chainpos" then ---~ -- todo: dejavu-serif has one (but i need to see what use it has) ---~ report_prepare("unsupported coverage %s for %s",lookuptype,lookupname) ---~ else ---~ local contexts = lookuphash[lookupname] ---~ if not contexts then ---~ contexts = { } ---~ lookuphash[lookupname] = contexts ---~ end ---~ local t, nt = { }, 0 ---~ for nofrules=1,#rules do -- does #rules>1 happen often? ---~ local rule = rules[nofrules] ---~ local current = rule.current ---~ local before = rule.before ---~ local after = rule.after ---~ local sequence = { } ---~ if before then ---~ uncover_1(before,sequence) ---~ end ---~ local start = #sequence + 1 ---~ uncover_1(current,sequence) ---~ local stop = #sequence ---~ if after then ---~ uncover_1(after,sequence) ---~ end ---~ if sequence[1] then ---~ nt = nt + 1 ---~ t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups } ---~ for unic, _ in next, sequence[start] do ---~ local cu = contexts[unic] ---~ if not cu then ---~ contexts[unic] = t ---~ end ---~ end ---~ end ---~ end ---~ end ---~ elseif fmt == "reversecoverage" then -- we could combine both branches (only dufference is replacements) ---~ if lookuptype ~= "reversesub" then ---~ report_prepare("unsupported reverse coverage %s for %s",lookuptype,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 = { } ---~ if before then ---~ uncover_1(before,sequence) ---~ end ---~ local start = #sequence + 1 ---~ uncover_1(current,sequence) ---~ local stop = #sequence ---~ if after then ---~ uncover_1(after,sequence) ---~ end ---~ if sequence[1] then ---~ 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 ---~ -- elseif fmt == "glyphs" then --maybe just make then before = { fore } and share with coverage ---~ -- if lookuptype ~= "chainsub" and lookuptype ~= "chainpos" then ---~ -- report_prepare("unsupported coverage %s for %s",lookuptype,lookupname) ---~ -- else ---~ -- local contexts = lookuphash[lookupname] ---~ -- if not contexts then ---~ -- contexts = { } ---~ -- lookuphash[lookupname] = contexts ---~ -- end ---~ -- local t, nt = { }, 0 ---~ -- for nofrules=1,#rules do -- we can make glyphs a special case (less tables) ---~ -- local rule = rules[nofrules] ---~ -- local current = rule.names ---~ -- local before = rule.fore ---~ -- local after = rule.back ---~ -- local sequence = { } ---~ -- if before then ---~ -- uncover_1(before,sequence) ---~ -- end ---~ -- local start = #sequence + 1 ---~ -- uncover_1(current,sequence) ---~ -- local stop = #sequence ---~ -- if after then ---~ -- uncover_1(after,sequence) ---~ -- end ---~ -- if sequence then ---~ -- nt = nt + 1 ---~ -- t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups } ---~ -- for unic, _ in next, sequence[start] do ---~ -- local cu = contexts[unic] ---~ -- if not cu then ---~ -- contexts[unic] = t ---~ -- end ---~ -- end ---~ -- end ---~ -- end ---~ -- end ---~ end ---~ end ---~ end ---~ end ---~ end ---~ 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 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 %s",format) - elseif not validformat[lookuptype] then - -- todo: dejavu-serif has one (but i need to see what use it has) - report_prepare("unsupported %s %s for %s",format,lookuptype,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 - -- Wventually 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 %s",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 %s",os.clock()-starttime,tfmdata.properties.fullname or "?") - end - end - end -end - -registerotffeature { - name = "features", - description = "features", - default = true, - initializers = { - position = 1, - node = featuresinitializer, - }, - processors = { - node = featuresprocessor, - } -} |