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|
if not modules then modules = { } end modules ['scrp-ini'] = {
version = 1.001,
comment = "companion to scrp-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- We need to rewrite this a bit ... rather old code ... will be done when japanese
-- is finished.
local attributes, nodes, node = attributes, nodes, node
local trace_analyzing = false trackers.register("scripts.analyzing", function(v) trace_analyzing = v end)
local trace_injections = false trackers.register("scripts.injections", function(v) trace_injections = v end)
local trace_splitting = false trackers.register("scripts.splitting", function(v) trace_splitting = v end)
local trace_splitdetail = false trackers.register("scripts.splitting.detail", function(v) trace_splitdetail = v end)
local report_preprocessing = logs.reporter("scripts","preprocessing")
local report_splitting = logs.reporter("scripts","splitting")
local utfbyte, utfsplit = utf.byte, utf.split
local gmatch = string.gmatch
local texsetattribute = tex.setattribute
local nodecodes = nodes.nodecodes
local unsetvalue = attributes.unsetvalue
local implement = interfaces.implement
local glyph_code = nodecodes.glyph
local glue_code = nodecodes.glue
local emwidths = fonts.hashes.emwidths
local exheights = fonts.hashes.exheights
local a_scriptinjection = attributes.private('scriptinjection')
local a_scriptsplitting = attributes.private('scriptsplitting')
local a_scriptstatus = attributes.private('scriptstatus')
local fontdata = fonts.hashes.identifiers
local allocate = utilities.storage.allocate
local setnodecolor = nodes.tracers.colors.set
local setmetatableindex = table.setmetatableindex
local enableaction = nodes.tasks.enableaction
local disableaction = nodes.tasks.disableaction
local nuts = nodes.nuts
local tonut = nuts.tonut
local tonode = nuts.tonode
local getnext = nuts.getnext
local getchar = nuts.getchar
local getfont = nuts.getfont
local getid = nuts.getid
local getattr = nuts.getattr
local setattr = nuts.setattr
local isglyph = nuts.isglyph
local insert_node_after = nuts.insert_after
local first_glyph = nuts.first_glyph
local traverse_id = nuts.traverse_id
local traverse_char = nuts.traverse_char
local nodepool = nuts.pool
local new_glue = nodepool.glue
local new_rule = nodepool.rule
local new_penalty = nodepool.penalty
scripts = scripts or { }
local scripts = scripts
scripts.hash = scripts.hash or { }
local hash = scripts.hash
local handlers = allocate()
scripts.handlers = handlers
local injectors = allocate()
scripts.injectors = handlers
local splitters = allocate()
scripts.splitters = splitters
local hash = { -- we could put these presets in char-def.lua
--
-- half width opening parenthesis
--
[0x0028] = "half_width_open",
[0x005B] = "half_width_open",
[0x007B] = "half_width_open",
[0x2018] = "half_width_open", -- ‘
[0x201C] = "half_width_open", -- “
--
-- full width opening parenthesis
--
[0x3008] = "full_width_open", -- 〈 Left book quote
[0x300A] = "full_width_open", -- 《 Left double book quote
[0x300C] = "full_width_open", -- 「 left quote
[0x300E] = "full_width_open", -- 『 left double quote
[0x3010] = "full_width_open", -- 【 left double book quote
[0x3014] = "full_width_open", -- 〔 left book quote
[0x3016] = "full_width_open", --〖 left double book quote
[0x3018] = "full_width_open", -- left tortoise bracket
[0x301A] = "full_width_open", -- left square bracket
[0x301D] = "full_width_open", -- reverse double prime qm
[0xFF08] = "full_width_open", -- ( left parenthesis
[0xFF3B] = "full_width_open", -- [ left square brackets
[0xFF5B] = "full_width_open", -- { left curve bracket
--
-- half width closing parenthesis
--
[0x0029] = "half_width_close",
[0x005D] = "half_width_close",
[0x007D] = "half_width_close",
[0x2019] = "half_width_close", -- ’ right quote, right
[0x201D] = "half_width_close", -- ” right double quote
--
-- full width closing parenthesis
--
[0x3009] = "full_width_close", -- 〉 book quote
[0x300B] = "full_width_close", -- 》 double book quote
[0x300D] = "full_width_close", -- 」 right quote, right
[0x300F] = "full_width_close", -- 』 right double quote
[0x3011] = "full_width_close", -- 】 right double book quote
[0x3015] = "full_width_close", -- 〕 right book quote
[0x3017] = "full_width_close", -- 〗 right double book quote
[0x3019] = "full_width_close", -- right tortoise bracket
[0x301B] = "full_width_close", -- right square bracket
[0x301E] = "full_width_close", -- double prime qm
[0x301F] = "full_width_close", -- low double prime qm
[0xFF09] = "full_width_close", -- ) right parenthesis
[0xFF3D] = "full_width_close", -- ] right square brackets
[0xFF5D] = "full_width_close", -- } right curve brackets
--
[0xFF62] = "half_width_open", -- left corner bracket
[0xFF63] = "half_width_close", -- right corner bracket
--
-- vertical opening vertical
--
-- 0xFE35, 0xFE37, 0xFE39, 0xFE3B, 0xFE3D, 0xFE3F, 0xFE41, 0xFE43, 0xFE47,
--
-- vertical closing
--
-- 0xFE36, 0xFE38, 0xFE3A, 0xFE3C, 0xFE3E, 0xFE40, 0xFE42, 0xFE44, 0xFE48,
--
-- half width opening punctuation
--
-- <empty>
--
-- full width opening punctuation
--
-- 0x2236, -- ∶
-- 0xFF0C, -- ,
--
-- half width closing punctuation_hw
--
[0x0021] = "half_width_close", -- !
[0x002C] = "half_width_close", -- ,
[0x002E] = "half_width_close", -- .
[0x003A] = "half_width_close", -- :
[0x003B] = "half_width_close", -- ;
[0x003F] = "half_width_close", -- ?
[0xFF61] = "half_width_close", -- hw full stop
--
-- full width closing punctuation
--
[0x3001] = "full_width_close", -- 、
[0x3002] = "full_width_close", -- 。
[0xFF0C] = "full_width_close", -- ,
[0xFF0E] = "full_width_close", --
--
-- depends on font
--
[0xFF01] = "full_width_close", -- !
[0xFF1F] = "full_width_close", -- ?
--
[0xFF1A] = "full_width_punct", -- :
[0xFF1B] = "full_width_punct", -- ;
--
-- non starter
--
[0x3005] = "non_starter", [0x3041] = "non_starter", [0x3043] = "non_starter", [0x3045] = "non_starter", [0x3047] = "non_starter",
[0x3049] = "non_starter", [0x3063] = "non_starter", [0x3083] = "non_starter", [0x3085] = "non_starter", [0x3087] = "non_starter",
[0x308E] = "non_starter", [0x3095] = "non_starter", [0x3096] = "non_starter", [0x309B] = "non_starter", [0x309C] = "non_starter",
[0x309D] = "non_starter", [0x309E] = "non_starter", [0x30A0] = "non_starter", [0x30A1] = "non_starter", [0x30A3] = "non_starter",
[0x30A5] = "non_starter", [0x30A7] = "non_starter", [0x30A9] = "non_starter", [0x30C3] = "non_starter", [0x30E3] = "non_starter",
[0x30E5] = "non_starter", [0x30E7] = "non_starter", [0x30EE] = "non_starter", [0x30F5] = "non_starter", [0x30F6] = "non_starter",
[0x30FC] = "non_starter", [0x30FD] = "non_starter", [0x30FE] = "non_starter", [0x31F0] = "non_starter", [0x31F1] = "non_starter",
[0x30F2] = "non_starter", [0x30F3] = "non_starter", [0x30F4] = "non_starter", [0x31F5] = "non_starter", [0x31F6] = "non_starter",
[0x30F7] = "non_starter", [0x30F8] = "non_starter", [0x30F9] = "non_starter", [0x31FA] = "non_starter", [0x31FB] = "non_starter",
[0x30FC] = "non_starter", [0x30FD] = "non_starter", [0x30FE] = "non_starter", [0x31FF] = "non_starter",
--
-- hyphenation
--
[0x2026] = "hyphen", -- … ellipsis
[0x2014] = "hyphen", -- — hyphen
--
[0x1361] = "ethiopic_word",
[0x1362] = "ethiopic_sentence",
--
}
local function provide(t,k)
local v
if not tonumber(k) then v = false
elseif (k >= 0x03040 and k <= 0x030FF)
or (k >= 0x031F0 and k <= 0x031FF)
or (k >= 0x032D0 and k <= 0x032FE)
or (k >= 0x0FF00 and k <= 0x0FFEF) then v = "katakana"
elseif (k >= 0x03400 and k <= 0x04DFF)
or (k >= 0x04E00 and k <= 0x09FFF)
or (k >= 0x0F900 and k <= 0x0FAFF)
or (k >= 0x20000 and k <= 0x2A6DF)
or (k >= 0x2F800 and k <= 0x2FA1F) then v = "chinese"
elseif (k >= 0x0AC00 and k <= 0x0D7A3) then v = "korean"
elseif (k >= 0x01100 and k <= 0x0115F) then v = "jamo_initial"
elseif (k >= 0x01160 and k <= 0x011A7) then v = "jamo_medial"
elseif (k >= 0x011A8 and k <= 0x011FF) then v = "jamo_final"
elseif (k >= 0x01200 and k <= 0x0139F) then v = "ethiopic_syllable"
else v = false
end
t[k] = v
return v
end
setmetatableindex(hash,provide) -- should come from char-def
scripts.hash = hash
local numbertodataset = allocate()
local numbertohandler = allocate()
--~ storage.register("scripts/hash", hash, "scripts.hash")
scripts.numbertodataset = numbertodataset
scripts.numbertohandler = numbertohandler
local defaults = {
inter_char_shrink_factor = 0,
inter_char_shrink_factor = 0,
inter_char_stretch_factor = 0,
inter_char_half_shrink_factor = 0,
inter_char_half_stretch_factor = 0,
inter_char_quarter_shrink_factor = 0,
inter_char_quarter_stretch_factor = 0,
inter_char_hangul_penalty = 0,
inter_word_stretch_factor = 0,
}
scripts.defaults = defaults -- so we can add more
function scripts.installmethod(handler)
local name = handler.name
handlers[name] = handler
local attributes = { }
local datasets = handler.datasets
if not datasets or not datasets.default then
report_preprocessing("missing (default) dataset in script %a",name)
datasets.default = { } -- slower but an error anyway
end
for k, v in next, datasets do
setmetatableindex(v,defaults)
end
setmetatable(attributes, {
__index = function(t,k)
local v = datasets[k] or datasets.default
local a = unsetvalue
if v then
v.name = name -- for tracing
a = #numbertodataset + 1
numbertodataset[a] = v
numbertohandler[a] = handler
end
t[k] = a
return a
end
} )
handler.attributes = attributes
end
function scripts.installdataset(specification) -- global overload
local method = specification.method
local name = specification.name
local dataset = specification.dataset
if method and name and dataset then
local parent = specification.parent or ""
local handler = handlers[method]
if handler then
local datasets = handler.datasets
if datasets then
local defaultset = datasets.default
if defaultset then
if parent ~= "" then
local p = datasets[parent]
if p then
defaultset = p
else
report_preprocessing("dataset, unknown parent %a for method %a",parent,method)
end
end
setmetatable(dataset,defaultset)
local existing = datasets[name]
if existing then
for k, v in next, existing do
existing[k] = dataset
end
else
datasets[name] = dataset
end
else
report_preprocessing("dataset, no default for method %a",method)
end
else
report_preprocessing("dataset, no datasets for method %a",method)
end
else
report_preprocessing("dataset, no method %a",method)
end
else
report_preprocessing("dataset, invalid specification") -- maybe report table
end
end
local injectorenabled = false
local splitterenabled = false
function scripts.set(name,method,preset)
local handler = handlers[method]
if handler then
if handler.injector then
if not injectorenabled then
enableaction("processors","scripts.injectors.handler")
injectorenabled = true
end
texsetattribute(a_scriptinjection,handler.attributes[preset] or unsetvalue)
end
if handler.splitter then
if not splitterenabled then
enableaction("processors","scripts.splitters.handler")
splitterenabled = true
end
texsetattribute(a_scriptsplitting,handler.attributes[preset] or unsetvalue)
end
if handler.initializer then
handler.initializer(handler)
handler.initializer = nil
end
else
texsetattribute(a_scriptinjection,unsetvalue)
texsetattribute(a_scriptsplitting,unsetvalue)
end
end
function scripts.reset()
texsetattribute(a_scriptinjection,unsetvalue)
texsetattribute(a_scriptsplitting,unsetvalue)
end
-- the following tables will become a proper installer (move to cjk/eth)
--
-- 0=gray 1=red 2=green 3=blue 4=yellow 5=magenta 6=cyan 7=x-yellow 8=x-magenta 9=x-cyan
local scriptcolors = allocate { -- todo: just named colors
korean = "trace:0",
chinese = "trace:0",
katakana = "trace:0",
hiragana = "trace:0",
full_width_open = "trace:1",
full_width_close = "trace:2",
half_width_open = "trace:3",
half_width_close = "trace:4",
full_width_punct = "trace:5",
hyphen = "trace:5",
non_starter = "trace:6",
jamo_initial = "trace:7",
jamo_medial = "trace:8",
jamo_final = "trace:9",
ethiopic_syllable = "trace:1",
ethiopic_word = "trace:2",
ethiopic_sentence = "trace:3",
}
scripts.colors = scriptcolors
local numbertocategory = allocate { -- rather bound to cjk ... will be generalized
"korean",
"chinese",
"katakana",
"hiragana",
"full_width_open",
"full_width_close",
"half_width_open",
"half_width_close",
"full_width_punct",
"hyphen",
"non_starter",
"jamo_initial",
"jamo_medial",
"jamo_final",
"ethiopic_syllable",
"ethiopic_word",
"ethiopic_sentence",
}
local categorytonumber = allocate(table.swapped(numbertocategory)) -- could be one table
scripts.categorytonumber = categorytonumber
scripts.numbertocategory = numbertocategory
local function colorize(start,stop)
for n in traverse_id(glyph_code,start) do
local kind = numbertocategory[getattr(n,a_scriptstatus)]
if kind then
local ac = scriptcolors[kind]
if ac then
setnodecolor(n,ac)
end
end
if n == stop then
break
end
end
end
local function traced_process(head,first,last,process,a)
if start ~= last then
local f, l = first, last
local name = numbertodataset[a]
name = name and name.name or "?"
report_preprocessing("before %s: %s",name,nodes.tosequence(f,l))
process(head,first,last)
report_preprocessing("after %s: %s", name,nodes.tosequence(f,l))
end
end
-- eventually we might end up with more extensive parsing
-- todo: pass t[start..stop] == original
--
-- one of the time consuming functions:
-- we can have a fonts.hashes.originals
function scripts.injectors.handler(head)
head = tonut(head)
local start = first_glyph(head) -- we already have glyphs here (subtype 1)
if not start then
return tonode(head), false
else
local last_a, normal_process, lastfont, originals = nil, nil, nil, nil
local done, first, last, ok = false, nil, nil, false
while start do
local char, id = isglyph(start)
if char then
local a = getattr(start,a_scriptinjection)
if a then
if a ~= last_a then
if first then
if ok then
if trace_analyzing then
colorize(first,last)
end
if trace_injections then
traced_process(head,first,last,normal_process,last_a)
else
normal_process(head,first,last)
end
ok, done = false, true
end
first, last = nil, nil
end
last_a = a
local handler = numbertohandler[a]
normal_process = handler.injector
end
if normal_process then
-- wrong: originals are indices !
local font = getfont(start)
if font ~= lastfont then
originals = fontdata[font].resources
if resources then
originals = resources.originals
else
originals = nil -- can't happen
end
lastfont = font
end
if originals and type(originals) == "number" then
char = originals[char] or char
end
local h = hash[char]
if h then
setattr(start,a_scriptstatus,categorytonumber[h])
if not first then
first, last = start, start
else
last = start
end
-- if cjk == "chinese" or cjk == "korean" then -- we need to prevent too much ( ) processing
ok = true
-- end
elseif first then
if ok then
if trace_analyzing then
colorize(first,last)
end
if trace_injections then
traced_process(head,first,last,normal_process,last_a)
else
normal_process(head,first,last)
end
ok, done = false, true
end
first, last = nil, nil
end
end
elseif first then
if ok then
if trace_analyzing then
colorize(first,last)
end
if trace_injections then
traced_process(head,first,last,normal_process,last_a)
else
normal_process(head,first,last)
end
ok, done = false, true
end
first, last = nil, nil
end
elseif id == glue_code then
if ok then
-- continue
elseif first then
-- no chinese or korean
first, last = nil, nil
end
elseif first then
if ok then
-- some chinese or korean
if trace_analyzing then
colorize(first,last)
end
if trace_injections then
traced_process(head,first,last,normal_process,last_a)
else
normal_process(head,first,last)
end
first, last, ok, done = nil, nil, false, true
elseif first then
first, last = nil, nil
end
end
start = getnext(start)
end
if ok then
if trace_analyzing then
colorize(first,last)
end
if trace_injections then
traced_process(head,first,last,normal_process,last_a)
else
normal_process(head,first,last)
end
done = true
end
return tonode(head), done
end
end
-- kind of experimental .. might move to it's own module
-- function scripts.splitters.handler(head)
-- return head, false
-- end
local function addwords(tree,data)
if not tree then
tree = { }
end
for word in gmatch(data,"%S+") do
local root = tree
local list = utfsplit(word,true)
for i=1,#list do
local l = utfbyte(list[i])
local r = root[l]
if not r then
r = { }
root[l] = r
end
if i == #list then
r.final = word -- true -- could be something else, like word in case of tracing
else
root = r
end
end
end
return tree
end
local loaded = { }
function splitters.load(handler,files)
local files = handler.files
local tree = handler.tree or { }
handler.tree = tree
if not files then
return
elseif type(files) == "string" then
files = { files }
handler.files = files
end
if trace_splitting then
report_splitting("loading splitter data for language/script %a",handler.name)
end
loaded[handler.name or "unknown"] = (loaded[handler.name or "unknown"] or 0) + 1
statistics.starttiming(loaded)
for i=1,#files do
local filename = files[i]
local fullname = resolvers.findfile(filename)
if fullname == "" then
fullname = resolvers.findfile(filename .. ".gz")
end
if fullname ~= "" then
if trace_splitting then
report_splitting("loading file %a",fullname)
end
local suffix, gzipped = gzip.suffix(fullname)
if suffix == "lua" then
local specification = table.load(fullname,gzipped and gzip.load)
if specification then
local lists = specification.lists
if lists then
for i=1,#lists do
local entry = lists[i]
local data = entry.data
if data then
if entry.compression == "zlib" then
data = zlib.decompress(data)
if entry.length and entry.length ~= #data then
report_splitting("compression error in file %a",fullname)
end
end
if data then
addwords(tree,data)
end
end
end
end
end
else
local data = gzipped and io.loadgzip(fullname) or io.loaddata(fullname)
if data then
addwords(tree,data)
end
end
else
report_splitting("unknown file %a",filename)
end
end
statistics.stoptiming(loaded)
return tree
end
statistics.register("loaded split lists", function()
if next(loaded) then
return string.format("%s, load time: %s",table.sequenced(loaded),statistics.elapsedtime(loaded))
end
end)
-- function splitters.addlist(name,filename)
-- local handler = scripts.handlers[name]
-- if handler and filename then
-- local files = handler.files
-- if not files then
-- files = { }
-- elseif type(files) == "string" then
-- files = { files }
-- end
-- handler.files = files
-- if type(filename) == "string" then
-- filename = utilities.parsers.settings_to_array(filename)
-- end
-- if type(filename) == "table" then
-- for i=1,#filename do
-- files[#files+1] = filenames[i]
-- end
-- end
-- end
-- end
--
-- commands.setscriptsplitterlist = splitters.addlist
local categories = characters.categories or { }
-- local function hit(root,head)
-- local current = getnext(head)
-- local lastrun = false
-- local lastfinal = false
-- while current and getid(current) == glyph_code do
-- local char = getchar(current)
-- local newroot = root[char]
-- if newroot then
-- local final = newroot.final
-- if final then
-- lastrun = current
-- lastfinal = final
-- end
-- root = newroot
-- elseif categories[char] == "mn" then
-- -- continue
-- else
-- return lastrun, lastfinal
-- end
-- current = getnext(current)
-- end
-- if lastrun then
-- return lastrun, lastfinal
-- end
-- end
local function hit(root,head)
local current = getnext(head)
local lastrun = false
local lastfinal = false
while current do
local char = isglyph(current)
if char then
local newroot = root[char]
if newroot then
local final = newroot.final
if final then
lastrun = current
lastfinal = final
end
root = newroot
elseif categories[char] == "mn" then
-- continue
else
return lastrun, lastfinal
end
else
break
end
end
if lastrun then
return lastrun, lastfinal
end
end
local tree, attr, proc
function splitters.handler(head) -- todo: also first_glyph test
head = tonut(head)
local current = head
local done = false
while current do
if getid(current) == glyph_code then
local a = getattr(current,a_scriptsplitting)
if a then
if a ~= attr then
local handler = numbertohandler[a]
tree = handler.tree or { }
attr = a
proc = handler.splitter
end
if proc then
local root = tree[getchar(current)]
if root then
-- we don't check for attributes in the hitter (yet)
local last, final = hit(root,current)
if last then
local next = getnext(last)
if next then
local nextchar = isglyph(next)
if not nextchar then
-- we're done
elseif tree[nextchar] then
if trace_splitdetail then
if type(final) == "string" then
report_splitting("advance %s processing between <%s> and <%c>","with",final,nextchar)
else
report_splitting("advance %s processing between <%c> and <%c>","with",char,nextchar)
end
end
head, current = proc(handler,head,current,last,1)
done = true
else
if trace_splitdetail then
-- could be punctuation
if type(final) == "string" then
report_splitting("advance %s processing between <%s> and <%c>","without",final,nextchar)
else
report_splitting("advance %s processing between <%c> and <%c>","without",char,nextchar)
end
end
head, current = proc(handler,head,current,last,2)
done = true
end
end
end
end
end
end
end
current = getnext(current)
end
return tonode(head), done
end
local function marker(head,current,font,color) -- could become: nodes.tracers.marker
local ex = exheights[font]
local em = emwidths [font]
head, current = insert_node_after(head,current,new_penalty(10000))
head, current = insert_node_after(head,current,new_glue(-0.05*em))
head, current = insert_node_after(head,current,new_rule(0.05*em,1.5*ex,0.5*ex))
setnodecolor(current,color)
return head, current
end
local last_a, last_f, last_s, last_q
function splitters.insertafter(handler,head,first,last,detail)
local a = getattr(first,a_scriptsplitting)
local f = getfont(first)
if a ~= last_a or f ~= last_f then
last_s = emwidths[f] * numbertodataset[a].inter_word_stretch_factor
last_a = a
last_f = f
end
if trace_splitting then
head, last = marker(head,last,f,detail == 2 and "trace:r" or "trace:g")
end
if ignore then
return head, last
else
return insert_node_after(head,last,new_glue(0,last_s))
end
end
-- word-xx.lua:
--
-- return {
-- comment = "test",
-- copyright = "not relevant",
-- language = "en",
-- timestamp = "2013-05-20 14:15:21",
-- version = "1.00",
-- lists = {
-- {
-- -- data = "we thrive information in thick worlds because of our marvelous and everyday capacity to select edit single out structure highlight group pair merge harmonize synthesize focus organize condense reduce boil down choose categorize catalog classify list abstract scan look into idealize isolate discriminate distinguish screen pigeonhole pick over sort integrate blend inspect filter lump skip smooth chunk average approximate cluster aggregate outline summarize itemize review dip into flip through browse glance into leaf through skim refine enumerate glean synopsize winnow the wheat from the chaff and separate the sheep from the goats",
-- data = "abstract aggregate and approximate average because blend boil browse capacity catalog categorize chaff choose chunk classify cluster condense dip discriminate distinguish down edit enumerate everyday filter flip focus from glance glean goats group harmonize highlight idealize in information inspect integrate into isolate itemize leaf list look lump marvelous merge of organize our out outline over pair pick pigeonhole reduce refine review scan screen select separate sheep single skim skip smooth sort structure summarize synopsize synthesize the thick thrive through to we wheat winnow worlds",
-- },
-- },
-- }
scripts.installmethod {
name = "test",
splitter = splitters.insertafter,
initializer = splitters.load,
files = {
-- "scrp-imp-word-test.lua",
"word-xx.lua",
},
datasets = {
default = {
inter_word_stretch_factor = 0.25, -- of quad
},
},
}
-- new plugin:
local registercontext = fonts.specifiers.registercontext
local mergecontext = fonts.specifiers.mergecontext
local otfscripts = characters.otfscripts
local report_scripts = logs.reporter("scripts","auto feature")
local trace_scripts = false trackers.register("scripts.autofeature",function(v) trace_scripts = v end)
local autofontfeature = scripts.autofontfeature or { }
scripts.autofontfeature = autofontfeature
local cache_yes = { }
local cache_nop = { }
setmetatableindex(cache_yes,function(t,k) local v = { } t[k] = v return v end)
setmetatableindex(cache_nop,function(t,k) local v = { } t[k] = v return v end)
-- beware: we need to tag a done (otherwise too many extra instances ... but how
-- often unpack? wait till we have a bitmap
--
-- we can consider merging this in handlers.characters(head) at some point as there
-- already check for the dynamic attribute so it saves a pass, however, then we also
-- need to check for a_scriptinjection there which nils the benefit
--
-- we can consider cheating: set all glyphs in a word as the first one but it's not
-- playing nice
function autofontfeature.handler(head)
for n in traverse_char(tonut(head)) do
-- if getattr(n,a_scriptinjection) then
-- -- already tagged by script feature, maybe some day adapt
-- else
local char = getchar(n)
local script = otfscripts[char]
if script then
local dynamic = getattr(n,0) or 0
local font = getfont(n)
if dynamic > 0 then
local slot = cache_yes[font]
local attr = slot[script]
if not attr then
attr = mergecontext(dynamic,name,2)
slot[script] = attr
if trace_scripts then
report_scripts("script: %s, trigger %C, dynamic: %a, variant: %a",script,char,attr,"extended")
end
end
if attr ~= 0 then
n[0] = attr
-- maybe set scriptinjection when associated
end
else
local slot = cache_nop[font]
local attr = slot[script]
if not attr then
attr = registercontext(font,script,2)
slot[script] = attr
if trace_scripts then
report_scripts("script: %s, trigger %C, dynamic: %s, variant: %a",script,char,attr,"normal")
end
end
if attr ~= 0 then
setattr(n,0,attr)
-- maybe set scriptinjection when associated
end
end
end
-- end
end
return head
end
function autofontfeature.enable()
report_scripts("globally enabled")
enableaction("processors","scripts.autofontfeature.handler")
end
function autofontfeature.disable()
report_scripts("globally disabled")
disableaction("processors","scripts.autofontfeature.handler")
end
implement {
name = "enableautofontscript",
actions = autofontfeature.enable
}
implement {
name = "disableautofontscript",
actions = autofontfeature.disable }
implement {
name = "setscript",
actions = scripts.set,
arguments = { "string", "string", "string" }
}
implement {
name = "resetscript",
actions = scripts.reset
}
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