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|
if not modules then modules = { } end modules ['math-noa'] = {
version = 1.001,
comment = "companion to math-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- beware: this is experimental code and there will be a more
-- generic (attribute value driven) interface too but for the
-- moment this is ok
--
-- we will also make dedicated processors (faster)
--
-- beware: names will change as we wil make noads.xxx.handler i.e. xxx
-- subnamespaces
local utf = unicode.utf8
local utfchar, utfbyte = utf.char, utf.byte
local format, rep = string.format, string.rep
local concat = table.concat
local fonts, nodes, node, mathematics = fonts, nodes, node, mathematics
local otf = fonts.handlers.otf
local otffeatures = fonts.constructors.newfeatures("otf")
local registerotffeature = otffeatures.register
local trace_remapping = false trackers.register("math.remapping", function(v) trace_remapping = v end)
local trace_processing = false trackers.register("math.processing", function(v) trace_processing = v end)
local trace_analyzing = false trackers.register("math.analyzing", function(v) trace_analyzing = v end)
local trace_normalizing = false trackers.register("math.normalizing", function(v) trace_normalizing = v end)
local report_processing = logs.reporter("mathematics","processing")
local report_remapping = logs.reporter("mathematics","remapping")
local report_normalizing = logs.reporter("mathematics","normalizing")
local set_attribute = node.set_attribute
local has_attribute = node.has_attribute
local mlist_to_hlist = node.mlist_to_hlist
local font_of_family = node.family_font
local fonthashes = fonts.hashes
local fontdata = fonthashes.identifiers
noads = noads or { } -- todo: only here
local noads = noads
noads.processors = noads.processors or { }
local processors = noads.processors
noads.handlers = noads.handlers or { }
local handlers = noads.handlers
local tasks = nodes.tasks
local nodecodes = nodes.nodecodes
local noadcodes = nodes.noadcodes
local noad_ord = noadcodes.ord
local noad_rel = noadcodes.rel
local noad_punct = noadcodes.punct
local math_noad = nodecodes.noad -- attr nucleus sub sup
local math_accent = nodecodes.accent -- attr nucleus sub sup accent
local math_radical = nodecodes.radical -- attr nucleus sub sup left degree
local math_fraction = nodecodes.fraction -- attr nucleus sub sup left right
local math_box = nodecodes.subbox -- attr list
local math_sub = nodecodes.submlist -- attr list
local math_char = nodecodes.mathchar -- attr fam char
local math_textchar = nodecodes.mathtextchar -- attr fam char
local math_delim = nodecodes.delim -- attr small_fam small_char large_fam large_char
local math_style = nodecodes.style -- attr style
local math_choice = nodecodes.choice -- attr display text script scriptscript
local math_fence = nodecodes.fence -- attr subtype
local left_fence_code = 1
local function process(start,what,n,parent)
if n then n = n + 1 else n = 0 end
while start do
local id = start.id
if trace_processing then
local margin = rep(" ",n or 0)
local detail = tostring(start)
if id == math_noad then
report_processing("%s%s (class: %s)",margin,detail,noadcodes[start.subtype] or "?")
elseif id == math_char then
local char = start.char
local fam = start.fam
local font = font_of_family(fam)
report_processing("%s%s (family: %s, font: %s, char: %s, shape: %s)",margin,detail,fam,font,char,utfchar(char))
else
report_processing("%s%s",margin,detail)
end
end
local proc = what[id]
if proc then
local done, newstart = proc(start,what,n,parent or start.prev)
if newstart then
start = newstart
end
elseif id == math_char or id == math_textchar or id == math_delim then
break
elseif id == math_style then
-- has a next
elseif id == math_noad then
local noad = start.nucleus if noad then process(noad,what,n,start) end -- list
noad = start.sup if noad then process(noad,what,n,start) end -- list
noad = start.sub if noad then process(noad,what,n,start) end -- list
elseif id == math_box or id == math_sub then
local noad = start.list if noad then process(noad,what,n,start) end -- list
elseif id == math_fraction then
local noad = start.num if noad then process(noad,what,n,start) end -- list
noad = start.denom if noad then process(noad,what,n,start) end -- list
noad = start.left if noad then process(noad,what,n,start) end -- delimiter
noad = start.right if noad then process(noad,what,n,start) end -- delimiter
elseif id == math_choice then
local noad = start.display if noad then process(noad,what,n,start) end -- list
noad = start.text if noad then process(noad,what,n,start) end -- list
noad = start.script if noad then process(noad,what,n,start) end -- list
noad = start.scriptscript if noad then process(noad,what,n,start) end -- list
elseif id == math_fence then
local noad = start.delim if noad then process(noad,what,n,start) end -- delimiter
elseif id == math_radical then
local noad = start.nucleus if noad then process(noad,what,n,start) end -- list
noad = start.sup if noad then process(noad,what,n,start) end -- list
noad = start.sub if noad then process(noad,what,n,start) end -- list
noad = start.left if noad then process(noad,what,n,start) end -- delimiter
noad = start.degree if noad then process(noad,what,n,start) end -- list
elseif id == math_accent then
local noad = start.nucleus if noad then process(noad,what,n,start) end -- list
noad = start.sup if noad then process(noad,what,n,start) end -- list
noad = start.sub if noad then process(noad,what,n,start) end -- list
noad = start.accent if noad then process(noad,what,n,start) end -- list
noad = start.bot_accent if noad then process(noad,what,n,start) end -- list
else
-- glue, penalty, etc
end
start = start.next
end
end
noads.process = process
-- character remapping
local mathalphabet = attributes.private("mathalphabet")
local mathgreek = attributes.private("mathgreek")
processors.relocate = { }
local function report_remap(tag,id,old,new,extra)
report_remapping("remapping %s in font %s from U+%05X (%s) to U+%05X (%s)%s",tag,id,old,utfchar(old),new,utfchar(new),extra or "")
end
local remapalphabets = mathematics.remapalphabets
local setnodecolor = nodes.tracers.colors.set
-- we can have a global famdata == fonts.famdata
--~ This does not work out well, as there are no fallbacks. Ok, we could
--~ define a poor mans simplify mechanism.
--~
--~ local function checked(pointer)
--~ local char = pointer.char
--~ local fam = pointer.fam
--~ local id = font_of_family(fam)
--~ local tfmdata = fontdata[id]
--~ local tc = tfmdata and tfmdata.characters
--~ if not tc[char] then
--~ local specials = characters.data[char].specials
--~ if specials and (specials[1] == "char" or specials[1] == "font") then
--~ newchar = specials[#specials]
--~ if trace_remapping then
--~ report_remap("fallback",id,char,newchar)
--~ end
--~ if trace_analyzing then
--~ setnodecolor(pointer,"font:isol")
--~ end
--~ pointer.char = newchar
--~ return true
--~ end
--~ end
--~ end
local current_id, current_characters
processors.relocate[math_char] = function(pointer)
local g = has_attribute(pointer,mathgreek) or 0
local a = has_attribute(pointer,mathalphabet) or 0
if a > 0 or g > 0 then
if a > 0 then
set_attribute(pointer,mathgreek,0)
end
if g > 0 then
set_attribute(pointer,mathalphabet,0)
end
local char = pointer.char
local newchar = remapalphabets(char,a,g)
if newchar then
local fam = pointer.fam
local id = font_of_family(fam)
--
local tfmdata = fontdata[id]
if tfmdata and tfmdata.characters[newchar] then
-- -- to be tested:
-- if id ~= current_id then
-- current_id = id
-- current_characters = fontdata[id].characters
-- end
-- if current_characters and current_characters[newchar] then
if trace_remapping then
report_remap("char",id,char,newchar)
end
if trace_analyzing then
setnodecolor(pointer,"font:isol")
end
pointer.char = newchar
return true
elseif trace_remapping then
report_remap("char",id,char,newchar," fails")
end
else
-- return checked(pointer)
end
else
-- return checked(pointer)
end
if trace_analyzing then
setnodecolor(pointer,"font:medi")
end
end
processors.relocate[math_textchar] = function(pointer)
if trace_analyzing then
setnodecolor(pointer,"font:init")
end
end
processors.relocate[math_delim] = function(pointer)
if trace_analyzing then
setnodecolor(pointer,"font:fina")
end
end
function handlers.relocate(head,style,penalties)
process(head,processors.relocate)
return true
end
-- some resize options (this works ok because the content is
-- empty and no larger next will be forced)
--
-- beware: we don't use \delcode but \Udelcode and as such have
-- no large_fam; also, we need to check for subtype and/or
-- small_fam not being 0 because \. sits in 0,0 by default
--
-- todo: just replace the character by an ord noad
-- and remove the right delimiter as well
local mathsize = attributes.private("mathsize")
local resize = { } processors.resize = resize
resize[math_fence] = function(pointer)
if pointer.subtype == left_fence_code then
local a = has_attribute(pointer,mathsize)
if a and a > 0 then
set_attribute(pointer,mathsize,0)
local d = pointer.delim
local df = d.small_fam
local id = font_of_family(df)
if id > 0 then
local ch = d.small_char
d.small_char = mathematics.big(fontdata[id],ch,a)
end
end
end
end
function handlers.resize(head,style,penalties)
process(head,resize)
return true
end
-- respacing
local mathpunctuation = attributes.private("mathpunctuation")
local respace = { } processors.respace = respace
local chardata = characters.data
-- only [nd,ll,ul][po][nd,ll,ul]
respace[math_noad] = function(pointer)
if pointer.subtype == noad_ord then
local a = has_attribute(pointer,mathpunctuation)
if a and a > 0 then
set_attribute(pointer,mathpunctuation,0)
local current_nucleus = pointer.nucleus
if current_nucleus.id == math_char then
local current_char = current_nucleus.char
local fc = chardata[current_char]
fc = fc and fc.category
if fc == "nd" or fc == "ll" or fc == "lu" then
local next_noad = pointer.next
if next_noad and next_noad.id == math_noad and next_noad.subtype == noad_punct then
local next_nucleus = next_noad.nucleus
if next_nucleus.id == math_char then
local next_char = next_nucleus.char
local nc = chardata[next_char]
nc = nc and nc.category
if nc == "po" then
local last_noad = next_noad.next
if last_noad and last_noad.id == math_noad and last_noad.subtype == noad_ord then
local last_nucleus = last_noad.nucleus
if last_nucleus.id == math_char then
local last_char = last_nucleus.char
local lc = chardata[last_char]
lc = lc and lc.category
if lc == "nd" or lc == "ll" or lc == "lu" then
local ord = node.new(math_noad) -- todo: pool
ord.subtype, ord.nucleus, ord.sub, ord.sup, ord.attr = noad_ord, next_noad.nucleus, next_noad.sub, next_noad.sup, next_noad.attr
-- next_noad.nucleus, next_noad.sub, next_noad.sup, next_noad.attr = nil, nil, nil, nil
next_noad.nucleus, next_noad.sub, next_noad.sup = nil, nil, nil -- else crash with attributes ref count
--~ next_noad.attr = nil
ord.next = last_noad
pointer.next = ord
node.free(next_noad)
end
end
end
end
end
end
end
end
end
end
end
function handlers.respace(head,style,penalties)
process(head,respace)
return true
end
-- The following code is dedicated to Luigi Scarso who pointed me
-- to the fact that \not= is not producing valid pdf-a code.
-- The code does not solve this for virtual characters but it does
-- a decent job on collapsing so that fonts that have the right
-- glyph will have a decent unicode point.
local collapse = { } processors.collapse = collapse
local mathpairs = characters.mathpairs
collapse[math_noad] = function(pointer)
if pointer.subtype == noad_rel then
local current_nucleus = pointer.nucleus
if current_nucleus.id == math_char then
local current_char = current_nucleus.char
local mathpair = mathpairs[current_char]
if mathpair then
local next_noad = pointer.next
if next_noad and next_noad.id == math_noad and next_noad.subtype == noad_rel then
local next_nucleus = next_noad.nucleus
if next_nucleus.id == math_char then
local next_char = next_nucleus.char
local newchar = mathpair[next_char]
if newchar then
local fam = current_nucleus.fam
local id = font_of_family(fam)
local tfmdata = fontdata[id]
if tfmdata and tfmdata.characters[newchar] then
-- print("!!!!!",current_char,next_char,newchar)
current_nucleus.char = newchar
local next_next_noad = next_noad.next
if next_next_noad then
pointer.next = next_next_noad
next_next_noad.prev = pointer
else
pointer.next = nil
end
node.free(next_noad)
end
end
end
end
end
end
end
end
function noads.handlers.collapse(head,style,penalties)
process(head,collapse)
return true
end
-- normalize scripts
local unscript = { } noads.processors.unscript = unscript
local superscripts = characters.superscripts
local subscripts = characters.subscripts
local replaced = { }
local function replace(pointer)
local next = pointer.next
local start_super, stop_super, start_sub, stop_sub
local mode = "unset"
while next and next.id == math_noad do
local nextnucleus = next.nucleus
if nextnucleus and nextnucleus.id == math_char and not next.sub and not next.sup then
local char = nextnucleus.char
local s = superscripts[char]
if s then
if not start_super then
start_super = next
mode = "super"
elseif mode == "sub" then
break
end
stop_super = next
next = next.next
nextnucleus.char = s
replaced[char] = (replaced[char] or 0) + 1
if trace_normalizing then
report_normalizing("superscript: U+05X (%s) => U+05X (%s)",char,utfchar(char),s,utfchar(s))
end
else
local s = subscripts[char]
if s then
if not start_sub then
start_sub = next
mode = "sub"
elseif mode == "super" then
break
end
stop_sub = next
next = next.next
nextnucleus.char = s
replaced[char] = (replaced[char] or 0) + 1
if trace_normalizing then
report_normalizing("subscript: U+05X (%s) => U+05X (%s)",char,utfchar(char),s,utfchar(s))
end
else
break
end
end
else
break
end
end
if start_super then
if start_super == stop_super then
pointer.sup = start_super.nucleus
else
local list = node.new(math_sub) -- todo attr
list.head = start_super
pointer.sup = list
end
if mode == "super" then
pointer.next = stop_super.next
end
stop_super.next = nil
end
if start_sub then
if start_sub == stop_sub then
pointer.sub = start_sub.nucleus
else
local list = node.new(math_sub) -- todo attr
list.head = start_sub
pointer.sub = list
end
if mode == "sub" then
pointer.next = stop_sub.next
end
stop_sub.next = nil
end
end
unscript[math_noad] = replace
-- unscript[math_accent] = replace
-- unscript[math_radical] = replace
-- unscript[math_fraction] = replace
function handlers.unscript(head,style,penalties)
process(head,unscript)
return true
end
statistics.register("math script replacements", function()
if next(replaced) then
local n, t = 0, { }
for k, v in table.sortedpairs(replaced) do
n = n + v
t[#t+1] = format("U+%05X:%s",k,utfchar(k))
end
return format("%s (n=%s)",concat(t," "),n)
end
end)
-- math alternates: (in xits lgf: $ABC$ $\cal ABC$ $\mathalternate{cal}\cal ABC$)
local function initializemathalternates(tfmdata)
local goodies = tfmdata.goodies
if goodies then
local shared = tfmdata.shared
for i=1,#goodies do
-- first one counts
-- we can consider sharing the attributes ... todo (only once scan)
local mathgoodies = goodies[i].mathematics
local alternates = mathgoodies and mathgoodies.alternates
if alternates then
local lastattribute, attributes = 0, { }
for k, v in next, alternates do
lastattribute = lastattribute + 1
v.attribute = lastattribute
attributes[lastattribute] = v
end
shared.mathalternates = alternates -- to be checked if shared is ok here
shared.mathalternatesattributes = attributes -- to be checked if shared is ok here
return
end
end
end
end
registerotffeature {
name = "mathalternates",
description = "additional math alternative shapes",
initializers = {
base = initializemathalternates,
node = initializemathalternates,
}
}
local getalternate = otf.getalternate
local mathalternate = attributes.private("mathalternate")
local alternate = { } -- processors.alternate = alternate
function mathematics.setalternate(fam,tag)
local id = font_of_family(fam)
local tfmdata = fontdata[id]
local mathalternates = tfmdata.shared.mathalternates
if mathalternates then
local m = mathalternates[tag]
tex.attribute[mathalternate] = m and m.attribute or attributes.unsetvalue
end
end
alternate[math_char] = function(pointer)
local a = has_attribute(pointer,mathalternate)
if a and a > 0 then
set_attribute(pointer,mathalternate,0)
local tfmdata = fontdata[font_of_family(pointer.fam)] -- we can also have a famdata
local mathalternatesattributes = tfmdata.shared.mathalternatesattributes
if mathalternatesattributes then
local what = mathalternatesattributes[a]
local alt = getalternate(tfmdata,pointer.char,what.feature,what.value)
if alt then
pointer.char = alt
end
end
end
end
function handlers.check(head,style,penalties)
process(head,alternate)
return true
end
-- the normal builder
function builders.kernel.mlist_to_hlist(head,style,penalties)
return mlist_to_hlist(head,style,penalties), true
end
--~ function builders.kernel.mlist_to_hlist(head,style,penalties)
--~ print("!!!!!!! BEFORE",penalties)
--~ for n in node.traverse(head) do print(n) end
--~ print("!!!!!!!")
--~ head = mlist_to_hlist(head,style,penalties)
--~ print("!!!!!!! AFTER")
--~ for n in node.traverse(head) do print(n) end
--~ print("!!!!!!!")
--~ return head, true
--~ end
tasks.new {
name = "math",
arguments = 2,
sequence = {
"before",
"normalizers",
"builders",
"after",
}
}
tasks.freezegroup("math", "normalizers") -- experimental
tasks.freezegroup("math", "builders") -- experimental
local actions = tasks.actions("math") -- head, style, penalties
local starttiming, stoptiming = statistics.starttiming, statistics.stoptiming
function processors.mlist_to_hlist(head,style,penalties)
starttiming(noads)
local head, done = actions(head,style,penalties)
stoptiming(noads)
return head, done
end
callbacks.register('mlist_to_hlist',processors.mlist_to_hlist,"preprocessing math list")
-- tracing
statistics.register("math processing time", function()
return statistics.elapsedseconds(noads)
end)
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