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if not modules then modules = { } end modules ['font-nod'] = {
version = 1.001,
optimize = true,
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"
}
--[[ldx--
<p>This is rather experimental. We need more control and some of this
might become a runtime module instead. This module will be cleaned up!</p>
--ldx]]--
local utfchar = utf.char
local concat, fastcopy = table.concat, table.fastcopy
local match, rep = string.match, string.rep
fonts = fonts or { }
nodes = nodes or { }
local fonts = fonts
local nodes = nodes
local context = context
local tracers = nodes.tracers or { }
nodes.tracers = tracers
local tasks = nodes.tasks or { }
nodes.tasks = tasks
local handlers = nodes.handlers or { }
nodes.handlers = handlers
local nuts = nodes.nuts
local tonut = nuts.tonut
local tonode = nuts.tonode
local injections = nodes.injections or { }
nodes.injections = injections
local step_tracers = tracers.steppers or { }
tracers.steppers = step_tracers
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local disc_code = nodecodes.disc
local glue_code = nodecodes.glue
local kern_code = nodecodes.kern
local dir_code = nodecodes.dir
local par_code = nodecodes.par
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getfont = nuts.getfont
local getsubtype = nuts.getsubtype
local getlist = nuts.getlist
local getdisc = nuts.getdisc
local getreplace = nuts.getreplace
local isglyph = nuts.isglyph
local getkern = nuts.getkern
local getdirection = nuts.getdirection
local getwidth = nuts.getwidth
local setbox = nuts.setbox
local setchar = nuts.setchar
local setsubtype = nuts.setsubtype
local copy_node_list = nuts.copylist
local hpacknodelist = nuts.hpack
local flushnodelist = nuts.flushlist
local protectglyphs = nuts.protectglyphs
local startofpar = nuts.startofpar
local nextnode = nuts.traversers.node
local nextglyph = nuts.traversers.glyph
local nodepool = nuts.pool
local new_glyph = nodepool.glyph
local formatters = string.formatters
local formatter = string.formatter
local hashes = fonts.hashes
local fontidentifiers = hashes.identifiers
local fontdescriptions = hashes.descriptions
local fontcharacters = hashes.characters
local fontproperties = hashes.properties
local fontparameters = hashes.parameters
local properties = nodes.properties.data
local function freeze(h,where)
for n in nextnode, h do -- todo: disc but not traced anyway
local p = properties[n]
if p then
local i = p.injections if i then p.injections = fastcopy(i) end
-- local i = r.preinjections if i then p.preinjections = fastcopy(i) end
-- local i = r.postinjections if i then p.postinjections = fastcopy(i) end
-- local i = r.replaceinjections if i then p.replaceinjections = fastcopy(i) end
-- only injections
end
end
end
local f_unicode = formatters["%U"]
local f_badcode = formatters["{%i}"]
local stack = { }
function tracers.start(tag)
stack[#stack+1] = tag
local tracer = tracers[tag]
if tracer and tracer.start then
tracer.start()
end
end
function tracers.stop()
local tracer = stack[#stack]
if tracer and tracer.stop then
tracer.stop()
end
stack[#stack] = nil
end
-- experimental
local collection, collecting, messages = { }, false, { }
function step_tracers.start()
collecting = true
end
function step_tracers.stop()
collecting = false
end
function step_tracers.reset()
for i=1,#collection do
local c = collection[i]
if c then
flushnodelist(c)
end
end
collection, messages = { }, { }
end
function step_tracers.nofsteps()
return context(#collection)
end
function step_tracers.glyphs(n,i)
local c = collection[i]
if c then
local c = copy_node_list(c)
local b = hpacknodelist(c) -- multiple arguments
setbox(n,b)
end
end
function step_tracers.features()
local f = collection[1]
for n, char, font in nextglyph, f do
local tfmdata = fontidentifiers[font]
local features = tfmdata.resources.features
local result_1 = { }
local result_2 = { }
local gpos = features and features.gpos or { }
local gsub = features and features.gsub or { }
for feature, value in table.sortedhash(tfmdata.shared.features) do
if feature == "number" or feature == "features" then
value = false
elseif type(value) == "boolean" then
if value then
value = "yes"
else
value = false
end
else
-- use value
end
if value then
if gpos[feature] or gsub[feature] or feature == "language" or feature == "script" then
result_1[#result_1+1] = formatters["%s=%s"](feature,value)
else
result_2[#result_2+1] = formatters["%s=%s"](feature,value)
end
end
end
if #result_1 > 0 then
context("{\\bf[basic:} %, t{\\bf]} ",result_1)
else
context("{\\bf[}no basic features{\\bf]} ")
end
if #result_2 > 0 then
context("{\\bf[extra:} %, t{\\bf]}",result_2)
else
context("{\\bf[}no extra features{\\bf]}")
end
return
end
end
function tracers.fontchar(font,char)
local n = new_glyph(font,char)
setsubtype(n,256)
context(tonode(n))
end
function step_tracers.font(command)
local c = collection[1]
for n, char, font in nextglyph, c do
local name = file.basename(fontproperties[font].filename or "unknown")
local size = fontparameters[font].size or 0
if command then
context[command](font,name,size) -- size in sp
else
context("[%s: %s @ %p]",font,name,size)
end
return
end
end
local colors = {
pre = { "darkred" },
post = { "darkgreen" },
replace = { "darkblue" },
}
function step_tracers.codes(i,command,space)
local c = collection[i]
local function showchar(c,f)
if command then
local d = fontdescriptions[f]
local d = d and d[c]
context[command](f,c,d and d.class or "")
else
context("[%s:U+%X]",f,c)
end
end
local function showdisc(d,w,what)
if w then
context.startcolor(colors[what])
context("%s:",what)
for c, id in nextnode, w do
if id == glyph_code then
local c, f = isglyph(c)
showchar(c,f)
else
context("[%s]",nodecodes[id])
end
end
context[space]()
context.stopcolor()
end
end
while c do
local char, id = isglyph(c)
if char then
showchar(char,id)
elseif id == dir_code or (id == par_code and startofpar(c)) then
context("[%s]",getdirection(c) or "?")
elseif id == disc_code then
local pre, post, replace = getdisc(c)
if pre or post or replace then
context("[")
context[space]()
showdisc(c,pre,"pre")
showdisc(c,post,"post")
showdisc(c,replace,"replace")
context[space]()
context("]")
else
context("[disc]")
end
else
context("[%s]",nodecodes[id])
end
c = getnext(c)
end
end
function step_tracers.messages(i,command,split)
local list = messages[i] -- or { "no messages" }
if list then
for i=1,#list do
local l = list[i]
if not command then
context("(%s)",l)
elseif split then
local a, b = match(l,"^(.-)%s*:%s*(.*)$")
context[command](a or l or "",b or "")
else
context[command](l)
end
end
end
end
-- hooks into the node list processor (see otf)
function step_tracers.check(head)
if collecting then
step_tracers.reset()
local n = copy_node_list(head)
freeze(n,"check")
injections.keepcounts() -- one-time
local l = injections.handler(n,"trace")
if l then -- hm, can be false
n = l
end
protectglyphs(n)
collection[1] = n
end
end
function step_tracers.register(head)
if collecting then
local nc = #collection+1
if messages[nc] then
local n = copy_node_list(head)
freeze(n,"register")
injections.keepcounts() -- one-time
local l = injections.handler(n,"trace")
if l then -- hm, can be false
n = l
end
protectglyphs(n)
collection[nc] = n
end
end
end
function step_tracers.message(str,...)
str = formatter(str,...)
if collecting then
local n = #collection + 1
local m = messages[n]
if not m then m = { } messages[n] = m end
m[#m+1] = str
end
return str -- saves an intermediate var in the caller
end
--
local threshold = 65536 -- 1pt
local function toutf(list,result,nofresult,stopcriterium,nostrip)
if list then
for n, id in nextnode, tonut(list) do
if id == glyph_code then
local c, f = isglyph(n)
if c > 0 then
local fc = fontcharacters[f]
if fc then
local fcc = fc[c]
if fcc then
local u = fcc.unicode
if not u then
nofresult = nofresult + 1
result[nofresult] = utfchar(c)
elseif type(u) == "table" then
for i=1,#u do
nofresult = nofresult + 1
result[nofresult] = utfchar(u[i])
end
else
nofresult = nofresult + 1
result[nofresult] = utfchar(u)
end
else
nofresult = nofresult + 1
result[nofresult] = utfchar(c)
end
else
nofresult = nofresult + 1
result[nofresult] = f_unicode(c)
end
else
nofresult = nofresult + 1
result[nofresult] = f_badcode(c)
end
elseif id == disc_code then
local replace = getreplace(n)
result, nofresult = toutf(replace,result,nofresult,false,true) -- needed?
elseif id == hlist_code or id == vlist_code then
-- if nofresult > 0 and result[nofresult] ~= " " then
-- nofresult = nofresult + 1
-- result[nofresult] = " "
-- end
result, nofresult = toutf(getlist(n),result,nofresult,false,true)
elseif id == glue_code then
if nofresult > 0 and result[nofresult] ~= " " and getwidth(n) > threshold then
nofresult = nofresult + 1
result[nofresult] = " "
end
elseif id == kern_code then
if nofresult > 0 and result[nofresult] ~= " " and getkern(n) > threshold then
nofresult = nofresult + 1
result[nofresult] = " "
end
end
if n == stopcriterium then
break
end
end
end
if not nostrip and nofresult > 0 and result[nofresult] == " " then
result[nofresult] = nil
nofresult = nofresult - 1
end
return result, nofresult
end
function nodes.toutf(list,stopcriterium)
local result, nofresult = toutf(list,{},0,stopcriterium)
return concat(result)
end
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