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|
if not modules then modules = { } end modules ['font-otn'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- this is a context version which can contain experimental code, but when we
-- have serious patches we also need to change the other two font-otn files
-- at some point i might decide to convert the whole list into a table and then
-- run over that instead (but it has some drawbacks as we also need to deal with
-- attributes and such so we need to keep a lot of track - which is why i rejected
-- that method - although it has become a bit easier in the meantime so it might
-- become an alternative (by that time i probably have gone completely lua) .. the
-- usual chicken-egg issues ... maybe mkix as it's no real tex any more then
-- preprocessors = { "nodes" }
-- anchor class : mark, mkmk, curs, mklg (todo)
-- anchor type : mark, basechar, baselig, basemark, centry, cexit, max (todo)
-- this is still somewhat preliminary and it will get better in due time;
-- much functionality could only be implemented thanks to the husayni font
-- of Idris Samawi Hamid to who we dedicate this module.
-- in retrospect it always looks easy but believe it or not, it took a lot
-- of work to get proper open type support done: buggy fonts, fuzzy specs,
-- special made testfonts, many skype sessions between taco, idris and me,
-- torture tests etc etc ... unfortunately the code does not show how much
-- time it took ...
-- todo:
--
-- extension infrastructure (for usage out of context)
-- sorting features according to vendors/renderers
-- alternative loop quitters
-- check cursive and r2l
-- find out where ignore-mark-classes went
-- default features (per language, script)
-- handle positions (we need example fonts)
-- handle gpos_single (we might want an extra width field in glyph nodes because adding kerns might interfere)
-- mark (to mark) code is still not what it should be (too messy but we need some more extreem husayni tests)
-- remove some optimizations (when I have a faster machine)
--
-- beware:
--
-- we do some disc jugling where we need to keep in mind that the
-- pre, post and replace fields can have prev pointers to a nesting
-- node ... i wonder if that is still needed
--
-- not possible:
--
-- \discretionary {alpha-} {betagammadelta}
-- {\discretionary {alphabeta-} {gammadelta}
-- {\discretionary {alphabetagamma-} {delta}
-- {alphabetagammadelta}}}
--[[ldx--
<p>This module is a bit more split up that I'd like but since we also want to test
with plain <l n='tex'/> it has to be so. This module is part of <l n='context'/>
and discussion about improvements and functionality mostly happens on the
<l n='context'/> mailing list.</p>
<p>The specification of OpenType is kind of vague. Apart from a lack of a proper
free specifications there's also the problem that Microsoft and Adobe
may have their own interpretation of how and in what order to apply features.
In general the Microsoft website has more detailed specifications and is a
better reference. There is also some information in the FontForge help files.</p>
<p>Because there is so much possible, fonts might contain bugs and/or be made to
work with certain rederers. These may evolve over time which may have the side
effect that suddenly fonts behave differently.</p>
<p>After a lot of experiments (mostly by Taco, me and Idris) we're now at yet another
implementation. Of course all errors are mine and of course the code can be
improved. There are quite some optimizations going on here and processing speed
is currently acceptable. Not all functions are implemented yet, often because I
lack the fonts for testing. Many scripts are not yet supported either, but I will
look into them as soon as <l n='context'/> users ask for it.</p>
<p>The specification leaves room for interpretation. In case of doubt the microsoft
implementation is the reference as it is the most complete one. As they deal with
lots of scripts and fonts, Kai and Ivo did a lot of testing of the generic code and
their suggestions help improve the code. I'm aware that not all border cases can be
taken care of, unless we accept excessive runtime, and even then the interference
with other mechanisms (like hyphenation) are not trivial.</p>
<p>Glyphs are indexed not by unicode but in their own way. This is because there is no
relationship with unicode at all, apart from the fact that a font might cover certain
ranges of characters. One character can have multiple shapes. However, at the
<l n='tex'/> end we use unicode so and all extra glyphs are mapped into a private
space. This is needed because we need to access them and <l n='tex'/> has to include
then in the output eventually.</p>
<p>The raw table as it coms from <l n='fontforge'/> gets reorganized in to fit out needs.
In <l n='context'/> that table is packed (similar tables are shared) and cached on disk
so that successive runs can use the optimized table (after loading the table is
unpacked). The flattening code used later is a prelude to an even more compact table
format (and as such it keeps evolving).</p>
<p>This module is sparsely documented because it is a moving target. The table format
of the reader changes and we experiment a lot with different methods for supporting
features.</p>
<p>As with the <l n='afm'/> code, we may decide to store more information in the
<l n='otf'/> table.</p>
<p>Incrementing the version number will force a re-cache. We jump the number by one
when there's a fix in the <l n='fontforge'/> library or <l n='lua'/> code that
results in different tables.</p>
--ldx]]--
-- action handler chainproc
--
-- gsub_single ok ok
-- gsub_multiple ok ok
-- gsub_alternate ok ok
-- gsub_ligature ok ok
-- gsub_context ok --
-- gsub_contextchain ok --
-- gsub_reversecontextchain ok --
-- chainsub -- ok
-- reversesub -- ok
-- gpos_mark2base ok ok
-- gpos_mark2ligature ok ok
-- gpos_mark2mark ok ok
-- gpos_cursive ok untested
-- gpos_single ok ok
-- gpos_pair ok ok
-- gpos_context ok --
-- gpos_contextchain ok --
--
-- todo: contextpos and contextsub and class stuff
--
-- actions:
--
-- handler : actions triggered by lookup
-- chainproc : actions triggered by contextual lookup
-- chainmore : multiple substitutions triggered by contextual lookup (e.g. fij -> f + ij)
--
-- remark: the 'not implemented yet' variants will be done when we have fonts that use them
-- We used to have independent hashes for lookups but as the tags are unique
-- we now use only one hash. If needed we can have multiple again but in that
-- case I will probably prefix (i.e. rename) the lookups in the cached font file.
-- Todo: make plugin feature that operates on char/glyphnode arrays
local type, next, tonumber = type, next, tonumber
local random = math.random
local formatters = string.formatters
local logs, trackers, nodes, attributes = logs, trackers, nodes, attributes
local registertracker = trackers.register
local registerdirective = directives.register
local fonts = fonts
local otf = fonts.handlers.otf
local trace_lookups = false registertracker("otf.lookups", function(v) trace_lookups = v end)
local trace_singles = false registertracker("otf.singles", function(v) trace_singles = v end)
local trace_multiples = false registertracker("otf.multiples", function(v) trace_multiples = v end)
local trace_alternatives = false registertracker("otf.alternatives", function(v) trace_alternatives = v end)
local trace_ligatures = false registertracker("otf.ligatures", function(v) trace_ligatures = v end)
local trace_contexts = false registertracker("otf.contexts", function(v) trace_contexts = v end)
local trace_marks = false registertracker("otf.marks", function(v) trace_marks = v end)
local trace_kerns = false registertracker("otf.kerns", function(v) trace_kerns = v end)
local trace_cursive = false registertracker("otf.cursive", function(v) trace_cursive = v end)
local trace_preparing = false registertracker("otf.preparing", function(v) trace_preparing = v end)
local trace_bugs = false registertracker("otf.bugs", function(v) trace_bugs = v end)
local trace_details = false registertracker("otf.details", function(v) trace_details = v end)
local trace_applied = false registertracker("otf.applied", function(v) trace_applied = v end)
local trace_steps = false registertracker("otf.steps", function(v) trace_steps = v end)
local trace_skips = false registertracker("otf.skips", function(v) trace_skips = v end)
local trace_directions = false registertracker("otf.directions", function(v) trace_directions = v end)
local trace_kernruns = false registertracker("otf.kernruns", function(v) trace_kernruns = v end)
local trace_discruns = false registertracker("otf.discruns", function(v) trace_discruns = v end)
local trace_compruns = false registertracker("otf.compruns", function(v) trace_compruns = v end)
local quit_on_no_replacement = true -- maybe per font
local zwnjruns = true
registerdirective("otf.zwnjruns", function(v) zwnjruns = v end)
registerdirective("otf.chain.quitonnoreplacement",function(value) quit_on_no_replacement = value end)
local report_direct = logs.reporter("fonts","otf direct")
local report_subchain = logs.reporter("fonts","otf subchain")
local report_chain = logs.reporter("fonts","otf chain")
local report_process = logs.reporter("fonts","otf process")
local report_prepare = logs.reporter("fonts","otf prepare")
local report_warning = logs.reporter("fonts","otf warning")
local report_run = logs.reporter("fonts","otf run")
registertracker("otf.verbose_chain", function(v) otf.setcontextchain(v and "verbose") end)
registertracker("otf.normal_chain", function(v) otf.setcontextchain(v and "normal") end)
registertracker("otf.replacements", "otf.singles,otf.multiples,otf.alternatives,otf.ligatures")
registertracker("otf.positions","otf.marks,otf.kerns,otf.cursive")
registertracker("otf.actions","otf.replacements,otf.positions")
registertracker("otf.injections","nodes.injections")
registertracker("*otf.sample","otf.steps,otf.actions,otf.analyzing")
local nuts = nodes.nuts
local tonode = nuts.tonode
local tonut = nuts.tonut
local getfield = nuts.getfield
local setfield = nuts.setfield
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getattr = nuts.getattr
local setattr = nuts.setattr
local getprop = nuts.getprop
local setprop = nuts.setprop
local getfont = nuts.getfont
local getsubtype = nuts.getsubtype
local getchar = nuts.getchar
local insert_node_before = nuts.insert_before
local insert_node_after = nuts.insert_after
local delete_node = nuts.delete
local remove_node = nuts.remove
local copy_node = nuts.copy
local copy_node_list = nuts.copy_list
local find_node_tail = nuts.tail
local flush_node_list = nuts.flush_list
local free_node = nuts.free
local end_of_math = nuts.end_of_math
local traverse_nodes = nuts.traverse
local traverse_id = nuts.traverse_id
local setmetatableindex = table.setmetatableindex
local zwnj = 0x200C
local zwj = 0x200D
local wildcard = "*"
local default = "dflt"
local nodecodes = nodes.nodecodes
local whatcodes = nodes.whatcodes
local glyphcodes = nodes.glyphcodes
local disccodes = nodes.disccodes
local glyph_code = nodecodes.glyph
local glue_code = nodecodes.glue
local disc_code = nodecodes.disc
local math_code = nodecodes.math
local dir_code = whatcodes.dir
local localpar_code = whatcodes.localpar
local discretionary_code = disccodes.discretionary
local ligature_code = glyphcodes.ligature
local privateattribute = attributes.private
-- Something is messed up: we have two mark / ligature indices, one at the injection
-- end and one here ... this is based on KE's patches but there is something fishy
-- there as I'm pretty sure that for husayni we need some connection (as it's much
-- more complex than an average font) but I need proper examples of all cases, not
-- of only some.
local a_state = privateattribute('state')
local a_cursbase = privateattribute('cursbase') -- to be checked, probably can go
local injections = nodes.injections
local setmark = injections.setmark
local setcursive = injections.setcursive
local setkern = injections.setkern
local setpair = injections.setpair
local resetinjection = injections.reset
local copyinjection = injections.copy
local setligaindex = injections.setligaindex
local getligaindex = injections.getligaindex
local cursonce = true
local fonthashes = fonts.hashes
local fontdata = fonthashes.identifiers
local otffeatures = fonts.constructors.newfeatures("otf")
local registerotffeature = otffeatures.register
local onetimemessage = fonts.loggers.onetimemessage or function() end
otf.defaultnodealternate = "none" -- first last
-- we share some vars here, after all, we have no nested lookups and less code
local tfmdata = false
local characters = false
local descriptions = false
local resources = false
local marks = false
local currentfont = false
local lookuptable = false
local anchorlookups = false
local lookuptypes = false
local lookuptags = false
local handlers = { }
local rlmode = 0
local featurevalue = false
local sweephead = { }
local sweepnode = nil
local sweepprev = nil
local sweepnext = nil
local notmatchpre = { }
local notmatchpost = { }
local notmatchreplace = { }
-- we use this for special testing and documentation
local checkstep = (nodes and nodes.tracers and nodes.tracers.steppers.check) or function() end
local registerstep = (nodes and nodes.tracers and nodes.tracers.steppers.register) or function() end
local registermessage = (nodes and nodes.tracers and nodes.tracers.steppers.message) or function() end
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_direct(...)
end
local function logwarning(...)
report_direct(...)
end
local f_unicode = formatters["%U"]
local f_uniname = formatters["%U (%s)"]
local f_unilist = formatters["% t (% t)"]
local function gref(n) -- currently the same as in font-otb
if type(n) == "number" then
local description = descriptions[n]
local name = description and description.name
if name then
return f_uniname(n,name)
else
return f_unicode(n)
end
elseif n then
local num, nam = { }, { }
for i=1,#n do
local ni = n[i]
if tonumber(ni) then -- later we will start at 2
local di = descriptions[ni]
num[i] = f_unicode(ni)
nam[i] = di and di.name or "-"
end
end
return f_unilist(num,nam)
else
return "<error in node mode tracing>"
end
end
local function cref(kind,chainname,chainlookupname,lookupname,index) -- not in the mood to alias f_
if index then
return formatters["feature %a, chain %a, sub %a, lookup %a, index %a"](kind,chainname,chainlookupname,lookuptags[lookupname],index)
elseif lookupname then
return formatters["feature %a, chain %a, sub %a, lookup %a"](kind,chainname,chainlookupname,lookuptags[lookupname])
elseif chainlookupname then
return formatters["feature %a, chain %a, sub %a"](kind,lookuptags[chainname],lookuptags[chainlookupname])
elseif chainname then
return formatters["feature %a, chain %a"](kind,lookuptags[chainname])
else
return formatters["feature %a"](kind)
end
end
local function pref(kind,lookupname)
return formatters["feature %a, lookup %a"](kind,lookuptags[lookupname])
end
-- We can assume that languages that use marks are not hyphenated. We can also assume
-- that at most one discretionary is present.
-- We do need components in funny kerning mode but maybe I can better reconstruct then
-- as we do have the font components info available; removing components makes the
-- previous code much simpler. Also, later on copying and freeing becomes easier.
-- However, for arabic we need to keep them around for the sake of mark placement
-- and indices.
local function copy_glyph(g) -- next and prev are untouched !
local components = getfield(g,"components")
if components then
setfield(g,"components",nil)
local n = copy_node(g)
copyinjection(n,g) -- we need to preserve the lig indices
setfield(g,"components",components)
return n
else
local n = copy_node(g)
copyinjection(n,g) -- we need to preserve the lig indices
return n
end
end
local function flattendisk(head,disc)
local replace = getfield(disc,"replace")
setfield(disc,"replace",nil)
free_node(disc)
if head == disc then
local next = getnext(disc)
if replace then
if next then
local tail = find_node_tail(replace)
setfield(tail,"next",next)
setfield(next,"prev",tail)
end
return replace, replace
elseif next then
return next, next
else
return -- maybe warning
end
else
local next = getnext(disc)
local prev = getprev(disc)
if replace then
local tail = find_node_tail(replace)
if next then
setfield(tail,"next",next)
setfield(next,"prev",tail)
end
setfield(prev,"next",replace)
setfield(replace,"prev",prev)
return head, replace
else
if next then
setfield(next,"prev",prev)
end
setfield(prev,"next",next)
return head, next
end
end
end
local function appenddisc(disc,list)
local post = getfield(disc,"post")
local replace = getfield(disc,"replace")
local phead = list
local rhead = copy_node_list(list)
local ptail = find_node_tail(post)
local rtail = find_node_tail(replace)
if post then
setfield(ptail,"next",phead)
setfield(phead,"prev",ptail)
else
setfield(disc,"post",phead)
end
if replace then
setfield(rtail,"next",rhead)
setfield(rhead,"prev",rtail)
else
setfield(disc,"replace",rhead)
end
end
-- start is a mark and we need to keep that one
local function markstoligature(kind,lookupname,head,start,stop,char)
if start == stop and getchar(start) == char then
return head, start
else
local prev = getprev(start)
local next = getnext(stop)
setfield(start,"prev",nil)
setfield(stop,"next",nil)
local base = copy_glyph(start)
if head == start then
head = base
end
resetinjection(base)
setfield(base,"char",char)
setfield(base,"subtype",ligature_code)
setfield(base,"components",start)
if prev then
setfield(prev,"next",base)
end
if next then
setfield(next,"prev",base)
end
setfield(base,"next",next)
setfield(base,"prev",prev)
return head, base
end
end
-- The next code is somewhat complicated by the fact that some fonts can have ligatures made
-- from ligatures that themselves have marks. This was identified by Kai in for instance
-- arabtype: KAF LAM SHADDA ALEF FATHA (0x0643 0x0644 0x0651 0x0627 0x064E). This becomes
-- KAF LAM-ALEF with a SHADDA on the first and a FATHA op de second component. In a next
-- iteration this becomes a KAF-LAM-ALEF with a SHADDA on the second and a FATHA on the
-- third component.
local function getcomponentindex(start) -- we could store this offset in the glyph (nofcomponents)
if getid(start) ~= glyph_code then -- and then get rid of all components
return 0
elseif getsubtype(start) == ligature_code then
local i = 0
local components = getfield(start,"components")
while components do
i = i + getcomponentindex(components)
components = getnext(components)
end
return i
elseif not marks[getchar(start)] then
return 1
else
return 0
end
end
local a_noligature = attributes.private("noligature")
local function toligature(kind,lookupname,head,start,stop,char,markflag,discfound) -- brr head
if getattr(start,a_noligature) == 1 then
-- so we can do: e\noligature{ff}e e\noligature{f}fie (we only look at the first)
return head, start
end
if start == stop and getchar(start) == char then
resetinjection(start)
setfield(start,"char",char)
return head, start
end
-- needs testing (side effects):
local components = getfield(start,"components")
if components then
-- we get a double free .. needs checking
-- flush_node_list(components)
end
--
local prev = getprev(start)
local next = getnext(stop)
local comp = start
setfield(start,"prev",nil)
setfield(stop,"next",nil)
local base = copy_glyph(start)
if start == head then
head = base
end
resetinjection(base)
setfield(base,"char",char)
setfield(base,"subtype",ligature_code)
setfield(base,"components",comp) -- start can have components ... do we need to flush?
if prev then
setfield(prev,"next",base)
end
if next then
setfield(next,"prev",base)
end
setfield(base,"prev",prev)
setfield(base,"next",next)
if not discfound then
local deletemarks = markflag ~= "mark"
local components = start
local baseindex = 0
local componentindex = 0
local head = base
local current = base
-- first we loop over the glyphs in start .. stop
while start do
local char = getchar(start)
if not marks[char] then
baseindex = baseindex + componentindex
componentindex = getcomponentindex(start)
elseif not deletemarks then -- quite fishy
setligaindex(start,baseindex + getligaindex(start,componentindex))
if trace_marks then
logwarning("%s: keep mark %s, gets index %s",pref(kind,lookupname),gref(char),getligaindex(start))
end
local n = copy_node(start)
copyinjection(n,start)
head, current = insert_node_after(head,current,n) -- unlikely that mark has components
elseif trace_marks then
logwarning("%s: delete mark %s",pref(kind,lookupname),gref(char))
end
start = getnext(start)
end
-- we can have one accent as part of a lookup and another following
-- local start = components -- was wrong (component scanning was introduced when more complex ligs in devanagari was added)
local start = getnext(current)
while start and getid(start) == glyph_code do
local char = getchar(start)
if marks[char] then
setligaindex(start,baseindex + getligaindex(start,componentindex))
if trace_marks then
logwarning("%s: set mark %s, gets index %s",pref(kind,lookupname),gref(char),getligaindex(start))
end
else
break
end
start = getnext(start)
end
else
-- discfound ... forget about marks .. probably no scripts that hyphenate and have marks
local discprev = getfield(discfound,"prev")
local discnext = getfield(discfound,"next")
if discprev and discnext then
-- we assume normalization in context, and don't care about generic ... especially
-- \- can give problems as there we can have a negative char but that won't match
-- anyway
local pre = getfield(discfound,"pre")
local post = getfield(discfound,"post")
local replace = getfield(discfound,"replace")
if not replace then -- todo: signal simple hyphen
local prev = getfield(base,"prev")
local copied = copy_node_list(comp)
setfield(discnext,"prev",nil) -- also blocks funny assignments
setfield(discprev,"next",nil) -- also blocks funny assignments
if pre then
setfield(discprev,"next",pre)
setfield(pre,"prev",discprev)
end
pre = comp
if post then
local tail = find_node_tail(post)
setfield(tail,"next",discnext)
setfield(discnext,"prev",tail)
setfield(post,"prev",nil)
else
post = discnext
end
setfield(prev,"next",discfound)
setfield(discfound,"prev",prev)
setfield(discfound,"next",next)
setfield(next,"prev",discfound)
setfield(base,"next",nil)
setfield(base,"prev",nil)
setfield(base,"components",copied)
setfield(discfound,"pre",pre)
setfield(discfound,"post",post)
setfield(discfound,"replace",base)
setfield(discfound,"subtype",discretionary_code)
base = prev -- restart
end
end
end
return head, base
end
local function multiple_glyphs(head,start,multiple,ignoremarks)
local nofmultiples = #multiple
if nofmultiples > 0 then
resetinjection(start)
setfield(start,"char",multiple[1])
if nofmultiples > 1 then
local sn = getnext(start)
for k=2,nofmultiples do -- todo: use insert_node
-- untested:
--
-- while ignoremarks and marks[getchar(sn)] then
-- local sn = getnext(sn)
-- end
local n = copy_node(start) -- ignore components
resetinjection(n)
setfield(n,"char",multiple[k])
setfield(n,"prev",start)
setfield(n,"next",sn)
if sn then
setfield(sn,"prev",n)
end
setfield(start,"next",n)
start = n
end
end
return head, start, true
else
if trace_multiples then
logprocess("no multiple for %s",gref(getchar(start)))
end
return head, start, false
end
end
local function get_alternative_glyph(start,alternatives,value,trace_alternatives)
local n = #alternatives
if value == "random" then
local r = random(1,n)
return alternatives[r], trace_alternatives and formatters["value %a, taking %a"](value,r)
elseif value == "first" then
return alternatives[1], trace_alternatives and formatters["value %a, taking %a"](value,1)
elseif value == "last" then
return alternatives[n], trace_alternatives and formatters["value %a, taking %a"](value,n)
else
value = tonumber(value)
if type(value) ~= "number" then
return alternatives[1], trace_alternatives and formatters["invalid value %s, taking %a"](value,1)
elseif value > n then
local defaultalt = otf.defaultnodealternate
if defaultalt == "first" then
return alternatives[n], trace_alternatives and formatters["invalid value %s, taking %a"](value,1)
elseif defaultalt == "last" then
return alternatives[1], trace_alternatives and formatters["invalid value %s, taking %a"](value,n)
else
return false, trace_alternatives and formatters["invalid value %a, %s"](value,"out of range")
end
elseif value == 0 then
return getchar(start), trace_alternatives and formatters["invalid value %a, %s"](value,"no change")
elseif value < 1 then
return alternatives[1], trace_alternatives and formatters["invalid value %a, taking %a"](value,1)
else
return alternatives[value], trace_alternatives and formatters["value %a, taking %a"](value,value)
end
end
end
-- handlers
function handlers.gsub_single(head,start,kind,lookupname,replacement)
if trace_singles then
logprocess("%s: replacing %s by single %s",pref(kind,lookupname),gref(getchar(start)),gref(replacement))
end
resetinjection(start)
setfield(start,"char",replacement)
return head, start, true
end
function handlers.gsub_alternate(head,start,kind,lookupname,alternative,sequence)
local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue
local choice, comment = get_alternative_glyph(start,alternative,value,trace_alternatives)
if choice then
if trace_alternatives then
logprocess("%s: replacing %s by alternative %a to %s, %s",pref(kind,lookupname),gref(getchar(start)),choice,gref(choice),comment)
end
resetinjection(start)
setfield(start,"char",choice)
else
if trace_alternatives then
logwarning("%s: no variant %a for %s, %s",pref(kind,lookupname),value,gref(getchar(start)),comment)
end
end
return head, start, true
end
function handlers.gsub_multiple(head,start,kind,lookupname,multiple,sequence)
if trace_multiples then
logprocess("%s: replacing %s by multiple %s",pref(kind,lookupname),gref(getchar(start)),gref(multiple))
end
return multiple_glyphs(head,start,multiple,sequence.flags[1])
end
function handlers.gsub_ligature(head,start,kind,lookupname,ligature,sequence)
local s, stop = getnext(start), nil
local startchar = getchar(start)
if marks[startchar] then
while s do
local id = getid(s)
if id == glyph_code and getfont(s) == currentfont and getsubtype(s)<256 then
local lg = ligature[getchar(s)]
if lg then
stop = s
ligature = lg
s = getnext(s)
else
break
end
else
break
end
end
if stop then
local lig = ligature.ligature
if lig then
if trace_ligatures then
local stopchar = getchar(stop)
head, start = markstoligature(kind,lookupname,head,start,stop,lig)
logprocess("%s: replacing %s upto %s by ligature %s case 1",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(getchar(start)))
else
head, start = markstoligature(kind,lookupname,head,start,stop,lig)
end
return head, start, true, false
else
-- ok, goto next lookup
end
end
else
local skipmark = sequence.flags[1]
local discfound = false
local lastdisc = nil
while s do
local id = getid(s)
if id == glyph_code and getsubtype(s)<256 then -- not needed
if getfont(s) == currentfont then -- also not needed only when mark
local char = getchar(s)
if skipmark and marks[char] then
s = getnext(s)
else -- ligature is a tree
local lg = ligature[char] -- can there be multiple in a row? maybe in a bad font
if lg then
if not discfound and lastdisc then
discfound = lastdisc
lastdisc = nil
end
stop = s -- needed for fake so outside then
ligature = lg
s = getnext(s)
else
break
end
end
else
break
end
elseif id == disc_code then
lastdisc = s
s = getnext(s)
else
break
end
end
local lig = ligature.ligature -- can't we get rid of this .ligature?
if lig then
if stop then
if trace_ligatures then
local stopchar = getchar(stop)
head, start = toligature(kind,lookupname,head,start,stop,lig,skipmark,discfound)
logprocess("%s: replacing %s upto %s by ligature %s case 2",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(getchar(start)))
else
head, start = toligature(kind,lookupname,head,start,stop,lig,skipmark,discfound)
end
else
-- weird but happens (in some arabic font)
resetinjection(start)
setfield(start,"char",lig)
if trace_ligatures then
logprocess("%s: replacing %s by (no real) ligature %s case 3",pref(kind,lookupname),gref(startchar),gref(lig))
end
end
return head, start, true, discfound
else
-- weird but happens, pseudo ligatures ... just the components
end
end
return head, start, false, discfound
end
function handlers.gpos_single(head,start,kind,lookupname,kerns,sequence,injection)
local startchar = getchar(start)
local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns,injection) -- ,characters[startchar])
if trace_kerns then
logprocess("%s: shifting single %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),dx,dy,w,h)
end
return head, start, false
end
function handlers.gpos_pair(head,start,kind,lookupname,kerns,sequence,lookuphash,i,injection)
-- todo: kerns in disc nodes: pre, post, replace -> loop over disc too
-- todo: kerns in components of ligatures
local snext = getnext(start)
if not snext then
return head, start, false
else
local prev = start
local done = false
local factor = tfmdata.parameters.factor
local lookuptype = lookuptypes[lookupname]
while snext and getid(snext) == glyph_code and getfont(snext) == currentfont and getsubtype(snext)<256 do
local nextchar = getchar(snext)
local krn = kerns[nextchar]
if not krn and marks[nextchar] then
prev = snext
snext = getnext(snext)
else
if not krn then
-- skip
elseif type(krn) == "table" then
if lookuptype == "pair" then -- probably not needed
local a, b = krn[2], krn[3]
if a and #a > 0 then
local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a,injection) -- characters[startchar])
if trace_kerns then
local startchar = getchar(start)
logprocess("%s: shifting first of pair %s and %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
if b and #b > 0 then
local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b,injection) -- characters[nextchar])
if trace_kerns then
local startchar = getchar(start)
logprocess("%s: shifting second of pair %s and %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
else -- wrong ... position has different entries
report_process("%s: check this out (old kern stuff)",pref(kind,lookupname))
-- local a, b = krn[2], krn[6]
-- if a and a ~= 0 then
-- local k = setkern(snext,factor,rlmode,a)
-- if trace_kerns then
-- logprocess("%s: inserting first kern %s between %s and %s",pref(kind,lookupname),k,gref(getchar(prev)),gref(nextchar))
-- end
-- end
-- if b and b ~= 0 then
-- logwarning("%s: ignoring second kern xoff %s",pref(kind,lookupname),b*factor)
-- end
end
done = true
elseif krn ~= 0 then
local k = setkern(snext,factor,rlmode,krn,injection)
if trace_kerns then
logprocess("%s: inserting kern %s between %s and %s",pref(kind,lookupname),k,gref(getchar(prev)),gref(nextchar)) -- prev?
end
done = true
end
break
end
end
return head, start, done
end
end
--[[ldx--
<p>We get hits on a mark, but we're not sure if the it has to be applied so
we need to explicitly test for basechar, baselig and basemark entries.</p>
--ldx]]--
function handlers.gpos_mark2base(head,start,kind,lookupname,markanchors,sequence)
local markchar = getchar(start)
if marks[markchar] then
local base = getprev(start) -- [glyph] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
end
end
local baseanchors = descriptions[basechar]
if baseanchors then
baseanchors = baseanchors.anchors
end
if baseanchors then
local baseanchors = baseanchors['basechar']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar])
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%p,%p)",
pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s, no matching anchors for mark %s and base %s",pref(kind,lookupname),gref(markchar),gref(basechar))
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
end
elseif trace_bugs then
logwarning("%s: prev node is no char",pref(kind,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
function handlers.gpos_mark2ligature(head,start,kind,lookupname,markanchors,sequence)
-- check chainpos variant
local markchar = getchar(start)
if marks[markchar] then
local base = getprev(start) -- [glyph] [optional marks] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
end
end
local index = getligaindex(start)
local baseanchors = descriptions[basechar]
if baseanchors then
baseanchors = baseanchors.anchors
if baseanchors then
local baseanchors = baseanchors['baselig']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor, ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
ba = ba[index]
if ba then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar]) -- index
if trace_marks then
logprocess("%s, anchor %s, index %s, bound %s: anchoring mark %s to baselig %s at index %s => (%p,%p)",
pref(kind,lookupname),anchor,index,bound,gref(markchar),gref(basechar),index,dx,dy)
end
return head, start, true
else
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and baselig %s with index %a",pref(kind,lookupname),gref(markchar),gref(basechar),index)
end
end
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and baselig %s",pref(kind,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
end
elseif trace_bugs then
logwarning("%s: prev node is no char",pref(kind,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
function handlers.gpos_mark2mark(head,start,kind,lookupname,markanchors,sequence)
local markchar = getchar(start)
if marks[markchar] then
local base = getprev(start) -- [glyph] [basemark] [start=mark]
local slc = getligaindex(start)
if slc then -- a rather messy loop ... needs checking with husayni
while base do
local blc = getligaindex(base)
if blc and blc ~= slc then
base = getprev(base)
else
break
end
end
end
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then -- subtype test can go
local basechar = getchar(base)
local baseanchors = descriptions[basechar]
if baseanchors then
baseanchors = baseanchors.anchors
if baseanchors then
baseanchors = baseanchors['basemark']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar],true)
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%p,%p)",
pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and basemark %s",pref(kind,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
end
elseif trace_bugs then
logwarning("%s: prev node is no mark",pref(kind,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
function handlers.gpos_cursive(head,start,kind,lookupname,exitanchors,sequence) -- to be checked
local alreadydone = cursonce and getprop(start,a_cursbase)
if not alreadydone then
local done = false
local startchar = getchar(start)
if marks[startchar] then
if trace_cursive then
logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar))
end
else
local nxt = getnext(start)
while not done and nxt and getid(nxt) == glyph_code and getfont(nxt) == currentfont and getsubtype(nxt)<256 do
local nextchar = getchar(nxt)
if marks[nextchar] then
-- should not happen (maybe warning)
nxt = getnext(nxt)
else
local entryanchors = descriptions[nextchar]
if entryanchors then
entryanchors = entryanchors.anchors
if entryanchors then
entryanchors = entryanchors['centry']
if entryanchors then
local al = anchorlookups[lookupname]
for anchor, entry in next, entryanchors do
if al[anchor] then
local exit = exitanchors[anchor]
if exit then
local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar])
if trace_cursive then
logprocess("%s: moving %s to %s cursive (%p,%p) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode)
end
done = true
break
end
end
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar))
onetimemessage(currentfont,startchar,"no entry anchors",report_fonts)
end
break
end
end
end
return head, start, done
else
if trace_cursive and trace_details then
logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(getchar(start)),alreadydone)
end
return head, start, false
end
end
--[[ldx--
<p>I will implement multiple chain replacements once I run into a font that uses
it. It's not that complex to handle.</p>
--ldx]]--
local chainprocs = { }
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_subchain(...)
end
local logwarning = report_subchain
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_chain(...)
end
local logwarning = report_chain
-- We could share functions but that would lead to extra function calls with many
-- arguments, redundant tests and confusing messages.
function chainprocs.chainsub(head,start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname)
logwarning("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
return head, start, false
end
-- The reversesub is a special case, which is why we need to store the replacements
-- in a bit weird way. There is no lookup and the replacement comes from the lookup
-- itself. It is meant mostly for dealing with Urdu.
function chainprocs.reversesub(head,start,stop,kind,chainname,currentcontext,lookuphash,replacements)
local char = getchar(start)
local replacement = replacements[char]
if replacement then
if trace_singles then
logprocess("%s: single reverse replacement of %s by %s",cref(kind,chainname),gref(char),gref(replacement))
end
resetinjection(start)
setfield(start,"char",replacement)
return head, start, true
else
return head, start, false
end
end
--[[ldx--
<p>This chain stuff is somewhat tricky since we can have a sequence of actions to be
applied: single, alternate, multiple or ligature where ligature can be an invalid
one in the sense that it will replace multiple by one but not neccessary one that
looks like the combination (i.e. it is the counterpart of multiple then). For
example, the following is valid:</p>
<typing>
<line>xxxabcdexxx [single a->A][multiple b->BCD][ligature cde->E] xxxABCDExxx</line>
</typing>
<p>Therefore we we don't really do the replacement here already unless we have the
single lookup case. The efficiency of the replacements can be improved by deleting
as less as needed but that would also make the code even more messy.</p>
--ldx]]--
-- local function delete_till_stop(head,start,stop,ignoremarks) -- keeps start
-- local n = 1
-- if start == stop then
-- -- done
-- elseif ignoremarks then
-- repeat -- start x x m x x stop => start m
-- local next = getnext(start)
-- if not marks[getchar(next)] then
-- local components = getfield(next,"components")
-- if components then -- probably not needed
-- flush_node_list(components)
-- end
-- head = delete_node(head,next)
-- end
-- n = n + 1
-- until next == stop
-- else -- start x x x stop => start
-- repeat
-- local next = getnext(start)
-- local components = getfield(next,"components")
-- if components then -- probably not needed
-- flush_node_list(components)
-- end
-- head = delete_node(head,next)
-- n = n + 1
-- until next == stop
-- end
-- return head, n
-- end
--[[ldx--
<p>Here we replace start by a single variant.</p>
--ldx]]--
function chainprocs.gsub_single(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex)
-- todo: marks ?
local current = start
local subtables = currentlookup.subtables
if #subtables > 1 then
logwarning("todo: check if we need to loop over the replacements: % t",subtables)
end
while current do
if getid(current) == glyph_code then
local currentchar = getchar(current)
local lookupname = subtables[1] -- only 1
local replacement = lookuphash[lookupname]
if not replacement then
if trace_bugs then
logwarning("%s: no single hits",cref(kind,chainname,chainlookupname,lookupname,chainindex))
end
else
replacement = replacement[currentchar]
if not replacement or replacement == "" then
if trace_bugs then
logwarning("%s: no single for %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar))
end
else
if trace_singles then
logprocess("%s: replacing single %s by %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar),gref(replacement))
end
resetinjection(current)
setfield(current,"char",replacement)
end
end
return head, start, true
elseif current == stop then
break
else
current = getnext(current)
end
end
return head, start, false
end
--[[ldx--
<p>Here we replace start by a sequence of new glyphs.</p>
--ldx]]--
function chainprocs.gsub_multiple(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
-- local head, n = delete_till_stop(head,start,stop)
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local replacements = lookuphash[lookupname]
if not replacements then
if trace_bugs then
logwarning("%s: no multiple hits",cref(kind,chainname,chainlookupname,lookupname))
end
else
replacements = replacements[startchar]
if not replacements or replacement == "" then
if trace_bugs then
logwarning("%s: no multiple for %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar))
end
else
if trace_multiples then
logprocess("%s: replacing %s by multiple characters %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar),gref(replacements))
end
return multiple_glyphs(head,start,replacements,currentlookup.flags[1])
end
end
return head, start, false
end
--[[ldx--
<p>Here we replace start by new glyph. First we delete the rest of the match.</p>
--ldx]]--
-- char_1 mark_1 -> char_x mark_1 (ignore marks)
-- char_1 mark_1 -> char_x
-- to be checked: do we always have just one glyph?
-- we can also have alternates for marks
-- marks come last anyway
-- are there cases where we need to delete the mark
function chainprocs.gsub_alternate(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local current = start
local subtables = currentlookup.subtables
local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue
while current do
if getid(current) == glyph_code then -- is this check needed?
local currentchar = getchar(current)
local lookupname = subtables[1]
local alternatives = lookuphash[lookupname]
if not alternatives then
if trace_bugs then
logwarning("%s: no alternative hit",cref(kind,chainname,chainlookupname,lookupname))
end
else
alternatives = alternatives[currentchar]
if alternatives then
local choice, comment = get_alternative_glyph(current,alternatives,value,trace_alternatives)
if choice then
if trace_alternatives then
logprocess("%s: replacing %s by alternative %a to %s, %s",cref(kind,chainname,chainlookupname,lookupname),gref(char),choice,gref(choice),comment)
end
resetinjection(start)
setfield(start,"char",choice)
else
if trace_alternatives then
logwarning("%s: no variant %a for %s, %s",cref(kind,chainname,chainlookupname,lookupname),value,gref(char),comment)
end
end
elseif trace_bugs then
logwarning("%s: no alternative for %s, %s",cref(kind,chainname,chainlookupname,lookupname),gref(currentchar),comment)
end
end
return head, start, true
elseif current == stop then
break
else
current = getnext(current)
end
end
return head, start, false
end
--[[ldx--
<p>When we replace ligatures we use a helper that handles the marks. I might change
this function (move code inline and handle the marks by a separate function). We
assume rather stupid ligatures (no complex disc nodes).</p>
--ldx]]--
function chainprocs.gsub_ligature(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex)
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local ligatures = lookuphash[lookupname]
if not ligatures then
if trace_bugs then
logwarning("%s: no ligature hits",cref(kind,chainname,chainlookupname,lookupname,chainindex))
end
else
ligatures = ligatures[startchar]
if not ligatures then
if trace_bugs then
logwarning("%s: no ligatures starting with %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar))
end
else
local s = getnext(start)
local discfound = false
local last = stop
local nofreplacements = 1
local skipmark = currentlookup.flags[1]
while s do
local id = getid(s)
if id == disc_code then
if not discfound then
discfound = s
end
if s == stop then
break -- okay? or before the disc
else
s = getnext(s)
end
else
local schar = getchar(s)
if skipmark and marks[schar] then -- marks
s = getnext(s)
else
local lg = ligatures[schar]
if lg then
ligatures, last, nofreplacements = lg, s, nofreplacements + 1
if s == stop then
break
else
s = getnext(s)
end
else
break
end
end
end
end
local l2 = ligatures.ligature
if l2 then
if chainindex then
stop = last
end
if trace_ligatures then
if start == stop then
logprocess("%s: replacing character %s by ligature %s case 3",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(l2))
else
logprocess("%s: replacing character %s upto %s by ligature %s case 4",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(getchar(stop)),gref(l2))
end
end
head, start = toligature(kind,lookupname,head,start,stop,l2,currentlookup.flags[1],discfound)
return head, start, true, nofreplacements, discfound
elseif trace_bugs then
if start == stop then
logwarning("%s: replacing character %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar))
else
logwarning("%s: replacing character %s upto %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(getchar(stop)))
end
end
end
end
return head, start, false, 0, false
end
function chainprocs.gpos_single(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence)
-- untested .. needs checking for the new model
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local kerns = lookuphash[lookupname]
if kerns then
kerns = kerns[startchar] -- needed ?
if kerns then
local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns) -- ,characters[startchar])
if trace_kerns then
logprocess("%s: shifting single %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),dx,dy,w,h)
end
end
end
return head, start, false
end
function chainprocs.gpos_pair(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence)
local snext = getnext(start)
if snext then
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local kerns = lookuphash[lookupname]
if kerns then
kerns = kerns[startchar]
if kerns then
local lookuptype = lookuptypes[lookupname]
local prev, done = start, false
local factor = tfmdata.parameters.factor
while snext and getid(snext) == glyph_code and getfont(snext) == currentfont and getsubtype(snext)<256 do
local nextchar = getchar(snext)
local krn = kerns[nextchar]
if not krn and marks[nextchar] then
prev = snext
snext = getnext(snext)
else
if not krn then
-- skip
elseif type(krn) == "table" then
if lookuptype == "pair" then
local a, b = krn[2], krn[3]
if a and #a > 0 then
local startchar = getchar(start)
local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a) -- ,characters[startchar])
if trace_kerns then
logprocess("%s: shifting first of pair %s and %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
if b and #b > 0 then
local startchar = getchar(start)
local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b) -- ,characters[nextchar])
if trace_kerns then
logprocess("%s: shifting second of pair %s and %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
else
report_process("%s: check this out (old kern stuff)",cref(kind,chainname,chainlookupname))
-- local a, b = krn[2], krn[6]
-- if a and a ~= 0 then
-- local k = setkern(snext,factor,rlmode,a)
-- if trace_kerns then
-- logprocess("%s: inserting first kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(getchar(prev)),gref(nextchar))
-- end
-- end
-- if b and b ~= 0 then
-- logwarning("%s: ignoring second kern xoff %s",cref(kind,chainname,chainlookupname),b*factor)
-- end
end
done = true
elseif krn ~= 0 then
local k = setkern(snext,factor,rlmode,krn)
if trace_kerns then
logprocess("%s: inserting kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(getchar(prev)),gref(nextchar))
end
done = true
end
break
end
end
return head, start, done
end
end
end
return head, start, false
end
function chainprocs.gpos_mark2base(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local markchar = getchar(start)
if marks[markchar] then
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local markanchors = lookuphash[lookupname]
if markanchors then
markanchors = markanchors[markchar]
end
if markanchors then
local base = getprev(start) -- [glyph] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
end
end
local baseanchors = descriptions[basechar].anchors
if baseanchors then
local baseanchors = baseanchors['basechar']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar])
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%p,%p)",
cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s, no matching anchors for mark %s and base %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
logwarning("%s: prev node is no char",cref(kind,chainname,chainlookupname,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
end
return head, start, false
end
function chainprocs.gpos_mark2ligature(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local markchar = getchar(start)
if marks[markchar] then
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local markanchors = lookuphash[lookupname]
if markanchors then
markanchors = markanchors[markchar]
end
if markanchors then
local base = getprev(start) -- [glyph] [optional marks] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",cref(kind,chainname,chainlookupname,lookupname),markchar)
end
return head, start, false
end
end
end
-- todo: like marks a ligatures hash
local index = getligaindex(start)
local baseanchors = descriptions[basechar].anchors
if baseanchors then
local baseanchors = baseanchors['baselig']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
ba = ba[index]
if ba then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar])
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to baselig %s at index %s => (%p,%p)",
cref(kind,chainname,chainlookupname,lookupname),anchor,a or bound,gref(markchar),gref(basechar),index,dx,dy)
end
return head, start, true
end
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and baselig %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
logwarning("feature %s, lookup %s: prev node is no char",kind,lookupname)
end
elseif trace_bugs then
logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
end
return head, start, false
end
function chainprocs.gpos_mark2mark(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local markchar = getchar(start)
if marks[markchar] then
-- local markanchors = descriptions[markchar].anchors markanchors = markanchors and markanchors.mark
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local markanchors = lookuphash[lookupname]
if markanchors then
markanchors = markanchors[markchar]
end
if markanchors then
local base = getprev(start) -- [glyph] [basemark] [start=mark]
local slc = getligaindex(start)
if slc then -- a rather messy loop ... needs checking with husayni
while base do
local blc = getligaindex(base)
if blc and blc ~= slc then
base = getprev(base)
else
break
end
end
end
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then -- subtype test can go
local basechar = getchar(base)
local baseanchors = descriptions[basechar].anchors
if baseanchors then
baseanchors = baseanchors['basemark']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar],true)
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%p,%p)",
cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and basemark %s",gref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
logwarning("%s: prev node is no mark",cref(kind,chainname,chainlookupname,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
end
return head, start, false
end
function chainprocs.gpos_cursive(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local alreadydone = cursonce and getprop(start,a_cursbase)
if not alreadydone then
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local exitanchors = lookuphash[lookupname]
if exitanchors then
exitanchors = exitanchors[startchar]
end
if exitanchors then
local done = false
if marks[startchar] then
if trace_cursive then
logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar))
end
else
local nxt = getnext(start)
while not done and nxt and getid(nxt) == glyph_code and getfont(nxt) == currentfont and getsubtype(nxt)<256 do
local nextchar = getchar(nxt)
if marks[nextchar] then
-- should not happen (maybe warning)
nxt = getnext(nxt)
else
local entryanchors = descriptions[nextchar]
if entryanchors then
entryanchors = entryanchors.anchors
if entryanchors then
entryanchors = entryanchors['centry']
if entryanchors then
local al = anchorlookups[lookupname]
for anchor, entry in next, entryanchors do
if al[anchor] then
local exit = exitanchors[anchor]
if exit then
local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar])
if trace_cursive then
logprocess("%s: moving %s to %s cursive (%p,%p) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode)
end
done = true
break
end
end
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar))
onetimemessage(currentfont,startchar,"no entry anchors",report_fonts)
end
break
end
end
end
return head, start, done
else
if trace_cursive and trace_details then
logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(getchar(start)),alreadydone)
end
return head, start, false
end
end
return head, start, false
end
-- what pointer to return, spec says stop
-- to be discussed ... is bidi changer a space?
-- elseif char == zwnj and sequence[n][32] then -- brrr
-- somehow l or f is global
-- we don't need to pass the currentcontext, saves a bit
-- make a slow variant then can be activated but with more tracing
local function show_skip(kind,chainname,char,ck,class)
if ck[9] then
logwarning("%s: skipping char %s, class %a, rule %a, lookuptype %a, %a => %a",cref(kind,chainname),gref(char),class,ck[1],ck[2],ck[9],ck[10])
else
logwarning("%s: skipping char %s, class %a, rule %a, lookuptype %a",cref(kind,chainname),gref(char),class,ck[1],ck[2])
end
end
-- A previous version had disc collapsing code in the (single sub) handler plus some
-- checking in the main loop, but that left the pre/post sequences undone. The best
-- solution is to add some checking there and backtrack when a replace/post matches
-- but it takes a bit of work to figure out an efficient way (this is what the sweep*
-- names refer to). I might look into that variant one day again as it can replace
-- some other code too. In that approach we can have a special version for gub and pos
-- which gains some speed. This method does the test and passes info to the handlers
-- (sweepnode, sweepmode, sweepprev, sweepnext, etc). Here collapsing is handled in the
-- main loop which also makes code elsewhere simpler (i.e. no need for the other special
-- runners and disc code in ligature building). I also experimented with pushing preceding
-- glyphs sequences in the replace/pre fields beforehand which saves checking afterwards
-- but at the cost of duplicate glyphs (memory) but it's too much overhead (runtime).
--
-- In the meantime Kai had moved the code from the single chain into a more general handler
-- and this one (renamed to chaindisk) is used now. I optimized the code a bit and brought
-- it in sycn with the other code. Hopefully I didn't introduce errors. Note: this somewhat
-- complex approach is meant for fonts that implement (for instance) ligatures by character
-- replacement which to some extend is not that suitable for hyphenation. I also use some
-- helpers. This method passes some states but reparses the list. There is room for a bit of
-- speed up but that will be done in the context version. (In fact a partial rewrite of all
-- code can bring some more efficientry.)
--
-- I didn't test it with extremes but successive disc nodes still can give issues but in
-- order to handle that we need more complex code which also slows down even more. The main
-- loop variant could deal with that: test, collapse, backtrack.
local function chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,chainindex,sequence,chainproc)
if not start then
return head, start, false
end
local startishead = start == head
local seq = ck[3]
local f = ck[4]
local l = ck[5]
local s = #seq
local done = false
local sweepnode = sweepnode
local sweeptype = sweeptype
local sweepoverflow = false
local checkdisc = getprev(head) -- hm bad name head
local keepdisc = not sweepnode
local lookaheaddisc = nil
local backtrackdisc = nil
local current = start
local last = start
local prev = getprev(start)
-- fishy: so we can overflow and then go on in the sweep?
local i = f
while i <= l do
local id = getid(current)
if id == glyph_code then
i = i + 1
last = current
current = getnext(current)
elseif id == disc_code then
if keepdisc then
keepdisc = false
if notmatchpre[current] ~= notmatchreplace[current] then
lookaheaddisc = current
end
local replace = getfield(current,"replace")
while replace and i <= l do
if getid(replace) == glyph_code then
i = i + 1
end
replace = getnext(replace)
end
last = current
current = getnext(c)
else
head, current = flattendisk(head,current)
end
else
last = current
current = getnext(current)
end
if current then
-- go on
elseif sweepoverflow then
-- we already are folling up on sweepnode
break
elseif sweeptype == "post" or sweeptype == "replace" then
current = getnext(sweepnode)
if current then
sweeptype = nil
sweepoverflow = true
else
break
end
end
end
if sweepoverflow then
local prev = current and getprev(current)
if not current or prev ~= sweepnode then
local head = getnext(sweepnode)
local tail = nil
if prev then
tail = prev
setfield(current,"prev",sweepnode)
else
tail = find_node_tail(head)
end
setfield(sweepnode,"next",current)
setfield(head,"prev",nil)
setfield(tail,"next",nil)
appenddisc(sweepnode,head)
end
end
if l < s then
local i = l
local t = sweeptype == "post" or sweeptype == "replace"
while current and i < s do
local id = getid(current)
if id == glyph_code then
i = i + 1
current = getnext(current)
elseif id == disc_code then
if keepdisc then
keepdisc = false
if notmatchpre[current] ~= notmatchreplace[current] then
lookaheaddisc = current
end
local replace = getfield(c,"replace")
while replace and i < s do
if getid(replace) == glyph_code then
i = i + 1
end
replace = getnext(replace)
end
current = getnext(current)
elseif notmatchpre[current] ~= notmatchreplace[current] then
head, current = flattendisk(head,current)
else
current = getnext(current) -- HH
end
else
current = getnext(current)
end
if not current and t then
current = getnext(sweepnode)
if current then
sweeptype = nil
end
end
end
end
if f > 1 then
local current = prev
local i = f
local t = sweeptype == "pre" or sweeptype == "replace"
if not current and t and current == checkdisk then
current = getprev(sweepnode)
end
while current and i > 1 do -- missing getprev added / moved outside
local id = getid(current)
if id == glyph_code then
i = i - 1
elseif id == disc_code then
if keepdisc then
keepdisc = false
if notmatchpost[current] ~= notmatchreplace[current] then
backtrackdisc = current
end
local replace = getfield(current,"replace")
while replace and i > 1 do
if getid(replace) == glyph_code then
i = i - 1
end
replace = getnext(replace)
end
elseif notmatchpost[current] ~= notmatchreplace[current] then
head, current = flattendisk(head,current)
end
end
current = getprev(current)
if t and current == checkdisk then
current = getprev(sweepnode)
end
end
end
local ok = false
if lookaheaddisc then
local cf = start
local cl = getprev(lookaheaddisc)
local cprev = getprev(start)
local insertedmarks = 0
while cprev and getid(cf) == glyph_code and getfont(cf) == currentfont and getsubtype(cf) < 256 and marks[getchar(cf)] do
insertedmarks = insertedmarks + 1
cf = cprev
startishead = cf == head
cprev = getprev(cprev)
end
setfield(lookaheaddisc,"prev",cprev)
if cprev then
setfield(cprev,"next",lookaheaddisc)
end
setfield(cf,"prev",nil)
setfield(cl,"next",nil)
if startishead then
head = lookaheaddisc
end
local replace = getfield(lookaheaddisc,"replace")
local pre = getfield(lookaheaddisc,"pre")
local new = copy_node_list(cf)
local cnew = new
for i=1,insertedmarks do
cnew = getnext(cnew)
end
local clast = cnew
for i=f,l do
clast = getnext(clast)
end
if not notmatchpre[lookaheaddisc] then
cf, start, ok = chainproc(cf,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if not notmatchreplace[lookaheaddisc] then
new, cnew, ok = chainproc(new,cnew,clast,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if pre then
setfield(cl,"next",pre)
setfield(pre,"prev",cl)
end
if replace then
local tail = find_node_tail(new)
setfield(tail,"next",replace)
setfield(replace,"prev",tail)
end
setfield(lookaheaddisc,"pre",cf) -- also updates tail
setfield(lookaheaddisc,"replace",new) -- also updates tail
start = getprev(lookaheaddisc)
sweephead[cf] = getnext(clast)
sweephead[new] = getnext(last)
elseif backtrackdisc then
local cf = getnext(backtrackdisc)
local cl = start
local cnext = getnext(start)
local insertedmarks = 0
while cnext and getid(cnext) == glyph_code and getfont(cnext) == currentfont and getsubtype(cnext) < 256 and marks[getchar(cnext)] do
insertedmarks = insertedmarks + 1
cl = cnext
cnext = getnext(cnext)
end
if cnext then
setfield(cnext,"prev",backtrackdisc)
end
setfield(backtrackdisc,"next",cnext)
setfield(cf,"prev",nil)
setfield(cl,"next",nil)
local replace = getfield(backtrackdisc,"replace")
local post = getfield(backtrackdisc,"post")
local new = copy_node_list(cf)
local cnew = find_node_tail(new)
for i=1,insertedmarks do
cnew = getprev(cnew)
end
local clast = cnew
for i=f,l do
clast = getnext(clast)
end
if not notmatchpost[backtrackdisc] then
cf, start, ok = chainproc(cf,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if not notmatchreplace[backtrackdisc] then
new, cnew, ok = chainproc(new,cnew,clast,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if post then
local tail = find_node_tail(post)
setfield(tail,"next",cf)
setfield(cf,"prev",tail)
else
post = cf
end
if replace then
local tail = find_node_tail(replace)
setfield(tail,"next",new)
setfield(new,"prev",tail)
else
replace = new
end
setfield(backtrackdisc,"post",post) -- also updates tail
setfield(backtrackdisc,"replace",replace) -- also updates tail
start = getprev(backtrackdisc)
sweephead[post] = getnext(clast)
sweephead[replace] = getnext(last)
else
head, start, ok = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
return head, start, ok
end
local function normal_handle_contextchain(head,start,kind,chainname,contexts,sequence,lookuphash)
local sweepnode = sweepnode
local sweeptype = sweeptype
local diskseen = false
local checkdisc = getprev(head)
local flags = sequence.flags
local done = false
local skipmark = flags[1]
local skipligature = flags[2]
local skipbase = flags[3]
local markclass = sequence.markclass
local skipped = false
for k=1,#contexts do -- i've only seen ccmp having > 1 (e.g. dejavu)
local match = true
local current = start
local last = start
local ck = contexts[k]
local seq = ck[3]
local s = #seq
-- f..l = mid string
if s == 1 then
-- never happens
match = getid(current) == glyph_code and getfont(current) == currentfont and getsubtype(current)<256 and seq[1][getchar(current)]
else
-- maybe we need a better space check (maybe check for glue or category or combination)
-- we cannot optimize for n=2 because there can be disc nodes
local f = ck[4]
local l = ck[5]
-- current match
if f == 1 and f == l then -- current only
-- already a hit
-- match = true
else -- before/current/after | before/current | current/after
-- no need to test first hit (to be optimized)
if f == l then -- new, else last out of sync (f is > 1)
-- match = true
else
local discfound = nil
local n = f + 1
last = getnext(last)
while n <= l do
if not last and (sweeptype == "post" or sweeptype == "replace") then
last = getnext(sweepnode)
sweeptype = nil
end
if last then
local id = getid(last)
if id == glyph_code then
if getfont(last) == currentfont and getsubtype(last)<256 then
local char = getchar(last)
local ccd = descriptions[char]
if ccd then
local class = ccd.class or "base"
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
skipped = true
if trace_skips then
show_skip(kind,chainname,char,ck,class)
end
last = getnext(last)
elseif seq[n][char] then
if n < l then
last = getnext(last)
end
n = n + 1
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
elseif id == disc_code then
diskseen = true
discfound = last
notmatchpre[last] = nil
notmatchpost[last] = true
notmatchreplace[last] = nil
local pre = getfield(last,"pre")
local replace = getfield(last,"replace")
if pre then
local n = n
while pre do
if seq[n][getchar(pre)] then
n = n + 1
pre = getnext(pre)
if n > l then
break
end
else
notmatchpre[last] = true
break
end
end
if n <= l then
notmatchpre[last] = true
end
else
notmatchpre[last] = true
end
if replace then
-- so far we never entered this branch
while replace do
if seq[n][getchar(replace)] then
n = n + 1
replace = getnext(replace)
if n > l then
break
end
else
notmatchreplace[last] = true
match = not notmatchpre[last]
break
end
end
match = not notmatchpre[last]
end
last = getnext(last)
else
match = false
break
end
else
match = false
break
end
end
end
end
-- before
if match and f > 1 then
local prev = getprev(start)
if prev then
if prev == checkdisc and (sweeptype == "pre" or sweeptype == "replace") then
prev = getprev(sweepnode)
-- sweeptype = nil
end
if prev then
local discfound = nil
local n = f - 1
while n >= 1 do
if prev then
local id = getid(prev)
if id == glyph_code then
if getfont(prev) == currentfont and getsubtype(prev)<256 then -- normal char
local char = getchar(prev)
local ccd = descriptions[char]
if ccd then
local class = ccd.class
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
skipped = true
if trace_skips then
show_skip(kind,chainname,char,ck,class)
end
elseif seq[n][char] then
n = n -1
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpost[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpost[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpost[discfound]
else
match = false
end
break
end
elseif id == disc_code then
-- the special case: f i where i becomes dottless i ..
diskseen = true
discfound = prev
notmatchpre[prev] = true
notmatchpost[prev] = nil
notmatchreplace[prev] = nil
local pre = getfield(prev,"pre")
local post = getfield(prev,"post")
local replace = getfield(prev,"replace")
if pre ~= start and post ~= start and replace ~= start then
if post then
local n = n
local posttail = find_node_tail(post)
while posttail do
if seq[n][getchar(posttail)] then
n = n - 1
if posttail == post then
break
else
posttail = getprev(posttail)
if n < 1 then
break
end
end
else
notmatchpost[prev] = true
break
end
end
if n >= 1 then
notmatchpost[prev] = true
end
else
notmatchpost[prev] = true
end
if replace then
-- we seldom enter this branch (e.g. on brill efficient)
local replacetail = find_node_tail(replace)
while replacetail do
if seq[n][getchar(replacetail)] then
n = n - 1
if replacetail == replace then
break
else
replacetail = getprev(replacetail)
if n < 1 then
break
end
end
else
notmatchreplace[prev] = true
match = not notmatchpost[prev]
break
end
end
if not match then
break
end
else
-- skip 'm
end
else
-- skip 'm
end
elseif seq[n][32] then
n = n -1
else
match = false
break
end
prev = getprev(prev)
elseif seq[n][32] then -- somewhat special, as zapfino can have many preceding spaces
n = n - 1
else
match = false
break
end
end
else
match = false
end
else
match = false
end
end
-- after
if match and s > l then
local current = last and getnext(last)
if not current then
if sweeptype == "post" or sweeptype == "replace" then
current = getnext(sweepnode)
-- sweeptype = nil
end
end
if current then
local discfound = nil
-- removed optimization for s-l == 1, we have to deal with marks anyway
local n = l + 1
while n <= s do
if current then
local id = getid(current)
if id == glyph_code then
if getfont(current) == currentfont and getsubtype(current)<256 then -- normal char
local char = getchar(current)
local ccd = descriptions[char]
if ccd then
local class = ccd.class
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
skipped = true
if trace_skips then
show_skip(kind,chainname,char,ck,class)
end
elseif seq[n][char] then
n = n + 1
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
elseif id == disc_code then
diskseen = true
discfound = current
notmatchpre[current] = nil
notmatchpost[current] = true
notmatchreplace[current] = nil
local pre = getfield(current,"pre")
local replace = getfield(current,"replace")
if pre then
local n = n
while pre do
if seq[n][getchar(pre)] then
n = n + 1
pre = getnext(pre)
if n > s then
break
end
else
notmatchpre[current] = true
break
end
end
if n <= s then
notmatchpre[current] = true
end
else
notmatchpre[current] = true
end
if replace then
-- so far we never entered this branch
while replace do
if seq[n][getchar(replace)] then
n = n + 1
replace = getnext(replace)
if n > s then
break
end
else
notmatchreplace[current] = true
match = notmatchpre[current]
break
end
end
if not match then
break
end
else
-- skip 'm
end
elseif seq[n][32] then -- brrr
n = n + 1
else
match = false
break
end
current = getnext(current)
elseif seq[n][32] then
n = n + 1
else
match = false
break
end
end
else
match = false
end
end
end
if match then
-- can lookups be of a different type ?
local diskchain = diskseen or sweepnode
if trace_contexts then
local rule, lookuptype, f, l = ck[1], ck[2], ck[4], ck[5]
local char = getchar(start)
if ck[9] then
logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %a, %a => %a",
cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype,ck[9],ck[10])
else
logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %a",
cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype)
end
end
local chainlookups = ck[6]
if chainlookups then
local nofchainlookups = #chainlookups
-- we can speed this up if needed
if nofchainlookups == 1 then
local chainlookupname = chainlookups[1]
local chainlookup = lookuptable[chainlookupname]
if chainlookup then
local chainproc = chainprocs[chainlookup.type]
if chainproc then
local ok
if diskchain then
head, start, ok = chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence,chainproc)
else
head, start, ok = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if ok then
done = true
end
else
logprocess("%s: %s is not yet supported",cref(kind,chainname,chainlookupname),chainlookup.type)
end
else -- shouldn't happen
logprocess("%s is not yet supported",cref(kind,chainname,chainlookupname))
end
else
local i = 1
while start and true do
if skipped then
while true do -- todo: use properties
local char = getchar(start)
local ccd = descriptions[char]
if ccd then
local class = ccd.class or "base"
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
start = getnext(start)
else
break
end
else
break
end
end
end
-- see remark in ms standard under : LookupType 5: Contextual Substitution Subtable
local chainlookupname = chainlookups[i]
local chainlookup = lookuptable[chainlookupname]
if not chainlookup then
-- we just advance
i = i + 1
else
local chainproc = chainprocs[chainlookup.type]
if not chainproc then
-- actually an error
logprocess("%s: %s is not yet supported",cref(kind,chainname,chainlookupname),chainlookup.type)
i = i + 1
else
local ok, n
if diskchain then
head, start, ok = chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence,chainproc)
else
head, start, ok, n = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,i,sequence)
end
-- messy since last can be changed !
if ok then
done = true
if n and n > 1 then
-- we have a ligature (cf the spec we advance one but we really need to test it
-- as there are fonts out there that are fuzzy and have too many lookups:
--
-- U+1105 U+119E U+1105 U+119E : sourcehansansklight: script=hang ccmp=yes
--
if i + n > nofchainlookups then
-- if trace_contexts then
-- logprocess("%s: quitting lookups",cref(kind,chainname))
-- end
break
else
-- we need to carry one
end
end
end
i = i + 1
end
end
if i > nofchainlookups or not start then
break
elseif start then
start = getnext(start)
end
end
end
else
local replacements = ck[7]
if replacements then
head, start, done = chainprocs.reversesub(head,start,last,kind,chainname,ck,lookuphash,replacements) -- sequence
else
done = quit_on_no_replacement -- can be meant to be skipped / quite inconsistent in fonts
if trace_contexts then
logprocess("%s: skipping match",cref(kind,chainname))
end
end
end
if done then
break -- out of contexts (new, needs checking)
end
end
end
if diskseen then -- maybe move up so that we can turn checking on/off
notmatchpre = { }
notmatchpost = { }
notmatchreplace = { }
end
return head, start, done
end
-- Because we want to keep this elsewhere (an because speed is less an issue) we
-- pass the font id so that the verbose variant can access the relevant helper tables.
local verbose_handle_contextchain = function(font,...)
logwarning("no verbose handler installed, reverting to 'normal'")
otf.setcontextchain()
return normal_handle_contextchain(...)
end
otf.chainhandlers = {
normal = normal_handle_contextchain,
verbose = verbose_handle_contextchain,
}
function otf.setcontextchain(method)
if not method or method == "normal" or not otf.chainhandlers[method] then
if handlers.contextchain then -- no need for a message while making the format
logwarning("installing normal contextchain handler")
end
handlers.contextchain = normal_handle_contextchain
else
logwarning("installing contextchain handler %a",method)
local handler = otf.chainhandlers[method]
handlers.contextchain = function(...)
return handler(currentfont,...) -- hm, get rid of ...
end
end
handlers.gsub_context = handlers.contextchain
handlers.gsub_contextchain = handlers.contextchain
handlers.gsub_reversecontextchain = handlers.contextchain
handlers.gpos_contextchain = handlers.contextchain
handlers.gpos_context = handlers.contextchain
end
otf.setcontextchain()
local missing = { } -- we only report once
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_process(...)
end
local logwarning = report_process
local function report_missing_cache(typ,lookup)
local f = missing[currentfont] if not f then f = { } missing[currentfont] = f end
local t = f[typ] if not t then t = { } f[typ] = t end
if not t[lookup] then
t[lookup] = true
logwarning("missing cache for lookup %a, type %a, font %a, name %a",lookup,typ,currentfont,tfmdata.properties.fullname)
end
end
local resolved = { } -- we only resolve a font,script,language pair once
-- todo: pass all these 'locals' in a table
local lookuphashes = { }
setmetatableindex(lookuphashes, function(t,font)
local lookuphash = fontdata[font].resources.lookuphash
if not lookuphash or not next(lookuphash) then
lookuphash = false
end
t[font] = lookuphash
return lookuphash
end)
-- fonts.hashes.lookups = lookuphashes
local autofeatures = fonts.analyzers.features -- was: constants
local function initialize(sequence,script,language,enabled)
local features = sequence.features
if features then
local order = sequence.order
if order then
for i=1,#order do --
local kind = order[i] --
local valid = enabled[kind]
if valid then
local scripts = features[kind] --
local languages = scripts[script] or scripts[wildcard]
if languages and (languages[language] or languages[wildcard]) then
return { valid, autofeatures[kind] or false, sequence, kind }
end
end
end
else
-- can't happen
end
end
return false
end
function otf.dataset(tfmdata,font) -- generic variant, overloaded in context
local shared = tfmdata.shared
local properties = tfmdata.properties
local language = properties.language or "dflt"
local script = properties.script or "dflt"
local enabled = shared.features
local res = resolved[font]
if not res then
res = { }
resolved[font] = res
end
local rs = res[script]
if not rs then
rs = { }
res[script] = rs
end
local rl = rs[language]
if not rl then
rl = {
-- indexed but we can also add specific data by key
}
rs[language] = rl
local sequences = tfmdata.resources.sequences
for s=1,#sequences do
local v = enabled and initialize(sequences[s],script,language,enabled)
if v then
rl[#rl+1] = v
end
end
end
return rl
end
-- assumptions:
--
-- * languages that use complex disc nodes
local function kernrun(disc,run)
--
-- we catch <font 1><disc font 2>
--
if trace_kernruns then
report_run("kern") -- will be more detailed
end
--
local prev = getprev(disc) -- todo, keep these in the main loop
local next = getnext(disc) -- todo, keep these in the main loop
--
local pre = getfield(disc,"pre")
local post = getfield(disc,"post")
local replace = getfield(disc,"replace")
--
local prevmarks = prev
--
-- can be optional, because why on earth do we get a disc after a mark (okay, maybe when a ccmp
-- has happened but then it should be in the disc so basically this test indicates an error)
--
while prevmarks and getid(prevmarks) == glyph_code and marks[getchar(prevmarks)] and getfont(prevmarks) == currentfont and getsubtype(prevmarks) < 256 do
prevmarks = getprev(prevmarks)
end
--
if prev and (pre or replace) and not (getid(prev) == glyph_code and getfont(prev) == currentfont and getsubtype(prev)<256) then
prev = false
end
if next and (post or replace) and not (getid(next) == glyph_code and getfont(next) == currentfont and getsubtype(next)<256) then
next = false
end
--
if not pre then
-- go on
elseif prev then
local nest = getprev(pre)
setfield(pre,"prev",prev)
setfield(prev,"next",pre)
run(prevmarks,"preinjections")
setfield(pre,"prev",nest)
setfield(prev,"next",disc)
else
run(pre,"preinjections")
end
--
if not post then
-- go on
elseif next then
local tail = find_node_tail(post)
setfield(tail,"next",next)
setfield(next,"prev",tail)
run(post,"postinjections",next)
setfield(tail,"next",nil)
setfield(next,"prev",disc)
else
run(post,"postinjections")
end
--
if not replace and prev and next then
-- this should be already done by discfound
setfield(prev,"next",next)
setfield(next,"prev",prev)
run(prevmarks,"injections",next)
setfield(prev,"next",disc)
setfield(next,"prev",disc)
elseif prev and next then
local tail = find_node_tail(replace)
local nest = getprev(replace)
setfield(replace,"prev",prev)
setfield(prev,"next",replace)
setfield(tail,"next",next)
setfield(next,"prev",tail)
run(prevmarks,"replaceinjections",next)
setfield(replace,"prev",nest)
setfield(prev,"next",disc)
setfield(tail,"next",nil)
setfield(next,"prev",disc)
elseif prev then
local nest = getprev(replace)
setfield(replace,"prev",prev)
setfield(prev,"next",replace)
run(prevmarks,"replaceinjections")
setfield(replace,"prev",nest)
setfield(prev,"next",disc)
elseif next then
local tail = find_node_tail(replace)
setfield(tail,"next",next)
setfield(next,"prev",tail)
run(replace,"replaceinjections",next)
setfield(tail,"next",nil)
setfield(next,"prev",disc)
else
run(replace,"replaceinjections")
end
end
-- the if new test might be dangerous as luatex will check / set some tail stuff
-- in a temp node
local function comprun(disc,run)
if trace_compruns then
report_run("comp: %s",languages.serializediscretionary(disc))
end
--
local pre = getfield(disc,"pre")
if pre then
sweepnode = disc
sweeptype = "pre" -- in alternative code preinjections is used (also used then for proeprties, saves a variable)
local new, done = run(pre)
if done then
setfield(disc,"pre",new)
end
end
--
local post = getfield(disc,"post")
if post then
sweepnode = disc
sweeptype = "post"
local new, done = run(post)
if done then
setfield(disc,"post",new)
end
end
--
local replace = getfield(disc,"replace")
if replace then
sweepnode = disc
sweeptype = "replace"
local new, done = run(replace)
if done then
setfield(disc,"replace",new)
end
end
sweepnode = nil
sweeptype = nil
end
local function testrun(disc,trun,crun) -- use helper
local next = getnext(disc)
if next then
local replace = getfield(disc,"replace")
if replace then
local prev = getprev(disc)
if prev then
-- only look ahead
local tail = find_node_tail(replace)
-- local nest = getprev(replace)
setfield(tail,"next",next)
setfield(next,"prev",tail)
if trun(replace,next) then
setfield(disc,"replace",nil) -- beware, side effects of nest so first
setfield(prev,"next",replace)
setfield(replace,"prev",prev)
setfield(next,"prev",tail)
setfield(tail,"next",next)
setfield(disc,"prev",nil)
setfield(disc,"next",nil)
flush_node_list(disc)
return replace -- restart
else
setfield(tail,"next",nil)
setfield(next,"prev",disc)
end
else
-- weird case
end
else
-- no need
end
else
-- weird case
end
comprun(disc,crun)
return next
end
local function discrun(disc,drun,krun)
local next = getnext(disc)
local prev = getprev(disc)
if trace_discruns then
report_run("disc") -- will be more detailed
end
if next and prev then
setfield(prev,"next",next)
-- setfield(next,"prev",prev)
drun(prev)
setfield(prev,"next",disc)
-- setfield(next,"prev",disc)
end
--
local pre = getfield(disc,"pre")
if not pre then
-- go on
elseif prev then
local nest = getprev(pre)
setfield(pre,"prev",prev)
setfield(prev,"next",pre)
krun(prev,"preinjections")
setfield(pre,"prev",nest)
setfield(prev,"next",disc)
else
krun(pre,"preinjections")
end
return next
end
-- todo: maybe run lr and rl stretches
local function featuresprocessor(head,font,attr)
local lookuphash = lookuphashes[font] -- we can also check sequences here
if not lookuphash then
return head, false
end
head = tonut(head)
if trace_steps then
checkstep(head)
end
tfmdata = fontdata[font]
descriptions = tfmdata.descriptions
characters = tfmdata.characters
resources = tfmdata.resources
marks = resources.marks
anchorlookups = resources.lookup_to_anchor
lookuptable = resources.lookups
lookuptypes = resources.lookuptypes
lookuptags = resources.lookuptags
currentfont = font
rlmode = 0
sweephead = { }
local sequences = resources.sequences
local done = false
local datasets = otf.dataset(tfmdata,font,attr)
local dirstack = { } -- could move outside function
-- We could work on sub start-stop ranges instead but I wonder if there is that
-- much speed gain (experiments showed that it made not much sense) and we need
-- to keep track of directions anyway. Also at some point I want to play with
-- font interactions and then we do need the full sweeps.
-- Keeping track of the headnode is needed for devanagari (I generalized it a bit
-- so that multiple cases are also covered.)
-- We don't goto the next node of a disc node is created so that we can then treat
-- the pre, post and replace. It's abit of a hack but works out ok for most cases.
-- there can be less subtype and attr checking in the comprun etc helpers
for s=1,#datasets do
local dataset = datasets[s]
featurevalue = dataset[1] -- todo: pass to function instead of using a global
local attribute = dataset[2]
local sequence = dataset[3] -- sequences[s] -- also dataset[5]
local kind = dataset[4]
----- chain = dataset[5] -- sequence.chain or 0
local rlparmode = 0
local topstack = 0
local success = false
local typ = sequence.type
local gpossing = typ == "gpos_single" or typ == "gpos_pair" -- maybe all of them
local subtables = sequence.subtables
local handler = handlers[typ]
if typ == "gsub_reversecontextchain" then -- chain < 0
-- this is a limited case, no special treatments like 'init' etc
-- we need to get rid of this slide! probably no longer needed in latest luatex
local start = find_node_tail(head) -- slow (we can store tail because there's always a skip at the end): todo
while start do
local id = getid(start)
if id == glyph_code then
if getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = a == attr
else
a = true
end
if a then
local char = getchar(start)
for i=1,#subtables do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- todo: disc?
head, start, success = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if success then
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
if start then start = getprev(start) end
else
start = getprev(start)
end
else
start = getprev(start)
end
else
start = getprev(start)
end
end
else
local ns = #subtables
local start = head -- local ?
rlmode = 0 -- to be checked ?
if ns == 1 then -- happens often
local lookupname = subtables[1]
local lookupcache = lookuphash[lookupname]
if not lookupcache then -- also check for empty cache
report_missing_cache(typ,lookupname)
else
local function c_run(head) -- no need to check for 256 and attr probably also the same
local done = false
local start = sweephead[head]
if start then
sweephead[head] = nil
else
start = head
end
while start do
local id = getid(start)
if id ~= glyph_code then
-- very unlikely
start = getnext(start)
elseif getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local lookupmatch = lookupcache[getchar(start)]
if lookupmatch then
-- sequence kan weg
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,1)
if ok then
done = true
end
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
return head, false
end
end
if done then
success = true -- needed in this subrun?
end
return head, done
end
local function t_run(start,stop)
while start ~= stop do
local id = getid(start)
if id == glyph_code and getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local lookupmatch = lookupcache[getchar(start)]
if lookupmatch then -- hm, hyphens can match (tlig) so we need to really check
-- if we need more than ligatures we can outline the code and use functions
local s = getnext(start)
local l = nil
while s do
local lg = lookupmatch[getchar(s)]
if lg then
l = lg
s = getnext(s)
else
break
end
end
if l and l.ligature then
return true
end
end
end
start = getnext(start)
else
break
end
end
end
local function d_run(prev) -- we can assume that prev and next are glyphs
local a = getattr(prev,0)
if a then
a = (a == attr) and (not attribute or getprop(prev,a_state) == attribute)
else
a = not attribute or getprop(prev,a_state) == attribute
end
if a then
local lookupmatch = lookupcache[getchar(prev)]
if lookupmatch then
-- sequence kan weg
local h, d, ok = handler(head,prev,kind,lookupname,lookupmatch,sequence,lookuphash,1)
if ok then
done = true
success = true
end
end
end
end
local function k_run(sub,injection,last)
local a = getattr(sub,0)
if a then
a = (a == attr) and (not attribute or getprop(sub,a_state) == attribute)
else
a = not attribute or getprop(sub,a_state) == attribute
end
if a then
-- sequence kan weg
for n in traverse_nodes(sub) do -- only gpos
if n == last then
break
end
local id = getid(n)
if id == glyph_code then
local lookupmatch = lookupcache[getchar(n)]
if lookupmatch then
local h, d, ok = handler(sub,n,kind,lookupname,lookupmatch,sequence,lookuphash,1,injection)
if ok then
done = true
success = true
end
end
else
-- message
end
end
end
end
while start do
local id = getid(start)
if id == glyph_code then
if getfont(start) == font and getsubtype(start) < 256 then -- why a 256 test ...
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local char = getchar(start)
local lookupmatch = lookupcache[char]
if lookupmatch then
-- sequence kan weg
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,1)
if ok then
success = true
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
start = getnext(start)
end
elseif id == disc_code then
if gpossing then
kernrun(start,k_run)
start = getnext(start)
elseif typ == "gsub_ligature" then
start = testrun(start,t_run,c_run)
else
comprun(start,c_run)
start = getnext(start)
end
elseif id == math_code then
start = getnext(end_of_math(start))
else
start = getnext(start)
end
end
end
else
local function c_run(head)
local done = false
local start = sweephead[head]
if start then
sweephead[head] = nil
else
start = head
end
while start do
local id = getid(start)
if id ~= glyph_code then
-- very unlikely
start = getnext(start)
elseif getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local char = getchar(start)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- we could move all code inline but that makes things even more unreadable
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if ok then
done = true
break
elseif not start then
-- don't ask why ... shouldn't happen
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
return head, false
end
end
if done then
success = true
end
return head, done
end
local function d_run(prev)
local a = getattr(prev,0)
if a then
a = (a == attr) and (not attribute or getprop(prev,a_state) == attribute)
else
a = not attribute or getprop(prev,a_state) == attribute
end
if a then
-- brr prev can be disc
local char = getchar(prev)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- we could move all code inline but that makes things even more unreadable
local h, d, ok = handler(head,prev,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if ok then
done = true
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
end
end
local function k_run(sub,injection,last)
local a = getattr(sub,0)
if a then
a = (a == attr) and (not attribute or getprop(sub,a_state) == attribute)
else
a = not attribute or getprop(sub,a_state) == attribute
end
if a then
for n in traverse_nodes(sub) do -- only gpos
if n == last then
break
end
local id = getid(n)
if id == glyph_code then
local char = getchar(n)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
local h, d, ok = handler(head,n,kind,lookupname,lookupmatch,sequence,lookuphash,i,injection)
if ok then
done = true
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
else
-- message
end
end
end
end
local function t_run(start,stop)
while start ~= stop do
local id = getid(start)
if id == glyph_code and getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local char = getchar(start)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- if we need more than ligatures we can outline the code and use functions
local s = getnext(start)
local l = nil
while s do
local lg = lookupmatch[getchar(s)]
if lg then
l = lg
s = getnext(s)
else
break
end
end
if l and l.ligature then
return true
end
end
else
report_missing_cache(typ,lookupname)
end
end
end
start = getnext(start)
else
break
end
end
end
while start do
local id = getid(start)
if id == glyph_code then
if getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local char = getchar(start)
local lookupmatch = lookupcache[char]
if lookupmatch then
-- we could move all code inline but that makes things even more unreadable
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if ok then
success = true
break
elseif not start then
-- don't ask why ... shouldn't happen
break
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
else
report_missing_cache(typ,lookupname)
end
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
start = getnext(start)
end
elseif id == disc_code then
if gpossing then
kernrun(start,k_run)
start = getnext(start)
elseif typ == "gsub_ligature" then
start = testrun(start,t_run,c_run)
else
comprun(start,c_run)
start = getnext(start)
end
elseif id == math_code then
start = getnext(end_of_math(start))
else
start = getnext(start)
end
end
end
end
if success then
done = true
end
if trace_steps then -- ?
registerstep(head)
end
end
head = tonode(head)
return head, done
end
-- this might move to the loader
local function generic(lookupdata,lookupname,unicode,lookuphash)
local target = lookuphash[lookupname]
if target then
target[unicode] = lookupdata
else
lookuphash[lookupname] = { [unicode] = lookupdata }
end
end
local function ligature(lookupdata,lookupname,unicode,lookuphash)
local target = lookuphash[lookupname]
if not target then
target = { }
lookuphash[lookupname] = target
end
for i=1,#lookupdata do
local li = lookupdata[i]
local tu = target[li]
if not tu then
tu = { }
target[li] = tu
end
target = tu
end
target.ligature = unicode
end
local function pair(lookupdata,lookupname,unicode,lookuphash)
local target = lookuphash[lookupname]
if not target then
target = { }
lookuphash[lookupname] = target
end
local others = target[unicode]
local paired = lookupdata[1]
if others then
others[paired] = lookupdata
else
others = { [paired] = lookupdata }
target[unicode] = others
end
end
local action = {
substitution = generic,
multiple = generic,
alternate = generic,
position = generic,
ligature = ligature,
pair = pair,
kern = pair,
}
local function prepare_lookups(tfmdata)
local rawdata = tfmdata.shared.rawdata
local resources = rawdata.resources
local lookuphash = resources.lookuphash
local anchor_to_lookup = resources.anchor_to_lookup
local lookup_to_anchor = resources.lookup_to_anchor
local lookuptypes = resources.lookuptypes
local characters = tfmdata.characters
local descriptions = tfmdata.descriptions
local duplicates = resources.duplicates
-- we cannot free the entries in the descriptions as sometimes we access
-- then directly (for instance anchors) ... selectively freeing does save
-- much memory as it's only a reference to a table and the slot in the
-- description hash is not freed anyway
-- we can delay this using metatables so that we don't make the hashes for
-- features we don't use but then we need to loop over the characters
-- many times so we gain nothing
for unicode, character in next, characters do -- we cannot loop over descriptions !
local description = descriptions[unicode]
if description then
local lookups = description.slookups
if lookups then
for lookupname, lookupdata in next, lookups do
action[lookuptypes[lookupname]](lookupdata,lookupname,unicode,lookuphash,duplicates)
end
end
local lookups = description.mlookups
if lookups then
for lookupname, lookuplist in next, lookups do
local lookuptype = lookuptypes[lookupname]
for l=1,#lookuplist do
local lookupdata = lookuplist[l]
action[lookuptype](lookupdata,lookupname,unicode,lookuphash,duplicates)
end
end
end
local list = description.kerns
if list then
for lookup, krn in next, list do -- ref to glyph, saves lookup
local target = lookuphash[lookup]
if target then
target[unicode] = krn
else
lookuphash[lookup] = { [unicode] = krn }
end
end
end
local list = description.anchors
if list then
for typ, anchors in next, list do -- types
if typ == "mark" or typ == "cexit" then -- or entry?
for name, anchor in next, anchors do
local lookups = anchor_to_lookup[name]
if lookups then
for lookup in next, lookups do
local target = lookuphash[lookup]
if target then
target[unicode] = anchors
else
lookuphash[lookup] = { [unicode] = anchors }
end
end
end
end
end
end
end
end
end
end
-- so far
local function split(replacement,original)
local result = { }
for i=1,#replacement do
result[original[i]] = replacement[i]
end
return result
end
local valid = {
coverage = { chainsub = true, chainpos = true, contextsub = true },
reversecoverage = { reversesub = true },
glyphs = { chainsub = true, chainpos = true },
}
local function prepare_contextchains(tfmdata)
local rawdata = tfmdata.shared.rawdata
local resources = rawdata.resources
local lookuphash = resources.lookuphash
local lookuptags = resources.lookuptags
local lookups = rawdata.lookups
if lookups then
for lookupname, lookupdata in next, rawdata.lookups do
local lookuptype = lookupdata.type
if lookuptype then
local rules = lookupdata.rules
if rules then
local format = lookupdata.format
local validformat = valid[format]
if not validformat then
report_prepare("unsupported format %a",format)
elseif not validformat[lookuptype] then
-- todo: dejavu-serif has one (but i need to see what use it has)
report_prepare("unsupported format %a, lookuptype %a, lookupname %a",format,lookuptype,lookuptags[lookupname])
else
local contexts = lookuphash[lookupname]
if not contexts then
contexts = { }
lookuphash[lookupname] = contexts
end
local t, nt = { }, 0
for nofrules=1,#rules do
local rule = rules[nofrules]
local current = rule.current
local before = rule.before
local after = rule.after
local replacements = rule.replacements
local sequence = { }
local nofsequences = 0
-- Eventually we can store start, stop and sequence in the cached file
-- but then less sharing takes place so best not do that without a lot
-- of profiling so let's forget about it.
if before then
for n=1,#before do
nofsequences = nofsequences + 1
sequence[nofsequences] = before[n]
end
end
local start = nofsequences + 1
for n=1,#current do
nofsequences = nofsequences + 1
sequence[nofsequences] = current[n]
end
local stop = nofsequences
if after then
for n=1,#after do
nofsequences = nofsequences + 1
sequence[nofsequences] = after[n]
end
end
if sequence[1] then
-- Replacements only happen with reverse lookups as they are single only. We
-- could pack them into current (replacement value instead of true) and then
-- use sequence[start] instead but it's somewhat ugly.
nt = nt + 1
t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups, replacements }
for unic in next, sequence[start] do
local cu = contexts[unic]
if not cu then
contexts[unic] = t
end
end
end
end
end
else
-- no rules
end
else
report_prepare("missing lookuptype for lookupname %a",lookuptags[lookupname])
end
end
end
end
-- we can consider lookuphash == false (initialized but empty) vs lookuphash == table
local function featuresinitializer(tfmdata,value)
if true then -- value then
-- beware we need to use the topmost properties table
local rawdata = tfmdata.shared.rawdata
local properties = rawdata.properties
if not properties.initialized then
local starttime = trace_preparing and os.clock()
local resources = rawdata.resources
resources.lookuphash = resources.lookuphash or { }
prepare_contextchains(tfmdata)
prepare_lookups(tfmdata)
properties.initialized = true
if trace_preparing then
report_prepare("preparation time is %0.3f seconds for %a",os.clock()-starttime,tfmdata.properties.fullname)
end
end
end
end
registerotffeature {
name = "features",
description = "features",
default = true,
initializers = {
position = 1,
node = featuresinitializer,
},
processors = {
node = featuresprocessor,
}
}
-- This can be used for extra handlers, but should be used with care!
otf.handlers = handlers
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