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if not modules then modules = { } end modules ['node-tra'] = {
version = 1.001,
comment = "companion to node-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.</p>
--ldx]]--
local utf = unicode.utf8
local format, match, concat, utfchar = string.format, string.match, table.concat, utf.char
local ctxcatcodes = tex.ctxcatcodes
fonts = fonts or { }
fonts.tfm = fonts.tfm or { }
fonts.ids = fonts.ids or { }
nodes = nodes or { }
nodes.tracers = nodes.tracers or { }
nodes.tracers.characters = nodes.tracers.characters or { }
nodes.tracers.steppers = nodes.tracers.steppers or { }
local glyph = node.id('glyph')
local disc = node.id('disc')
local glue = node.id('glue')
local kern = node.id('kern')
local whatsit = node.id('whatsit')
local copy_node_list = node.copy_list
local hpack_node_list = node.hpack
local free_node_list = node.flush_list
local first_character = node.first_character
local node_type = node.type
local traverse_nodes = node.traverse
local texsprint = tex.sprint
local fontdata = fonts.ids
function nodes.tracers.characters.collect(head,list,tag,n)
n = n or 0
local ok, fn = false, nil
while head do
local id = head.id
if id == glyph then
local f = head.font
if f ~= fn then
ok, fn = false, f
end
local c = head.char
local i = fontdata[f].indices[c] or 0
if not ok then
ok = true
n = n + 1
list[n] = list[n] or { }
list[n][tag] = { }
end
local l = list[n][tag]
l[#l+1] = { c, f, i }
elseif id == disc then
-- skip
else
ok = false
end
head = head.next
end
end
function nodes.tracers.characters.equal(ta, tb)
if #ta ~= #tb then
return false
else
for i=1,#ta do
local a, b = ta[i], tb[i]
if a[1] ~= b[1] or a[2] ~= b[2] or a[3] ~= b[3] then
return false
end
end
end
return true
end
function nodes.tracers.characters.string(t)
local tt = { }
for i=1,#t do
tt[i] = utfchar(t[i][1])
end
return concat(tt,"")
end
function nodes.tracers.characters.unicodes(t,decimal)
local tt = { }
for i=1,#t do
local n = t[i][1]
if n == 0 then
tt[i] = "-"
elseif decimal then
tt[i] = n
else
tt[i] = format("U+%04X",n)
end
end
return concat(tt," ")
end
function nodes.tracers.characters.indices(t,decimal)
local tt = { }
for i=1,#t do
local n = t[i][3]
if n == 0 then
tt[i] = "-"
elseif decimal then
tt[i] = n
else
tt[i] = format("U+%04X",n)
end
end
return concat(tt," ")
end
function nodes.tracers.characters.start()
local npc = nodes.process_characters
local list = { }
function nodes.process_characters(head)
local n = #list
nodes.tracers.characters.collect(head,list,'before',n)
local h, d = npc(head)
nodes.tracers.characters.collect(head,list,'after',n)
if #list > n then
list[#list+1] = { }
end
return h, d
end
function nodes.tracers.characters.stop()
tracers.list['characters'] = list
lmx.set('title', 'ConTeXt Character Processing Information')
lmx.set('color-background-one', lmx.get('color-background-yellow'))
lmx.set('color-background-two', lmx.get('color-background-purple'))
lmx.show('context-characters.lmx')
lmx.restore()
nodes.process_characters = npc
tasks.restart("processors", "characters")
end
tasks.restart("processors", "characters")
end
local stack = { }
function nodes.tracers.start(tag)
stack[#stack+1] = tag
local tracer = nodes.tracers[tag]
if tracer and tracer.start then
tracer.start()
end
end
function nodes.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 nodes.tracers.steppers.start()
collecting = true
end
function nodes.tracers.steppers.stop()
collecting = false
end
function nodes.tracers.steppers.reset()
for i=1,#collection do
local c = collection[i]
if c then
free_node_list(c)
end
end
collection, messages = { }, { }
end
function nodes.tracers.steppers.nofsteps()
return tex.write(#collection)
end
function nodes.tracers.steppers.glyphs(n,i)
local c = collection[i]
if c then
tex.box[n] = hpack_node_list(copy_node_list(c))
end
end
function nodes.tracers.steppers.features()
-- local f = first_character(collection[1])
-- if f then -- something fishy with first_character
local f = collection[1]
while f do
if f.id == glyph then
local tfmdata, t = fontdata[f.font], { }
for feature, value in table.sortedpairs(tfmdata.shared.features) do
if feature == "number" or feature == "features" then
-- private
elseif type(value) == "boolean" then
if value then
t[#t+1] = format("%s=yes",feature)
else
-- skip
end
else
t[#t+1] = format("%s=%s",feature,value)
end
end
if #t > 0 then
texsprint(ctxcatcodes,concat(t,", "))
else
texsprint(ctxcatcodes,"no features")
end
return
end
f = f.next
end
end
function nodes.tracers.fontchar(font,char)
local n = nodes.glyph()
n.font, n.char, n.subtype = font, char, 256
node.write(n)
end
function nodes.tracers.steppers.codes(i,command)
local c = collection[i]
while c do
local id = c.id
if id == glyph then
if command then
texsprint(ctxcatcodes,format("%s{%s}{%s}",command,c.font,c.char))
else
texsprint(ctxcatcodes,format("[%s:U+%04X]",c.font,c.char))
end
elseif id == whatsit and (c.subtype == 6 or c.subtype == 7) then
texsprint(ctxcatcodes,format("[%s]",c.dir))
else
texsprint(ctxcatcodes,format("[%s]",node_type(id)))
end
c = c.next
end
end
function nodes.tracers.steppers.messages(i,command,split)
local list = messages[i] -- or { "no messages" }
if list then
for i=1,#list do
local l = list[i]
if split then
local a, b = match(l,"^(.-)%s*:%s*(.*)$")
texsprint(ctxcatcodes,format("%s{%s}{%s}",command,a or l,b or ""))
else
texsprint(ctxcatcodes,format("%s{%s}",command,l))
end
end
end
end
-- hooks into the node list processor (see otf)
function nodes.tracers.steppers.check(head)
if collecting then
nodes.tracers.steppers.reset()
local n = copy_node_list(head)
nodes.inject_kerns(n,nil,"trace",true)
nodes.protect_glyphs(n) -- can be option
collection[1] = n
end
end
function nodes.tracers.steppers.register(head)
if collecting then
local nc = #collection+1
if messages[nc] then
local n = copy_node_list(head)
nodes.inject_kerns(n,nil,"trace",true)
nodes.protect_glyphs(n) -- can be option
collection[nc] = n
end
end
end
function nodes.tracers.steppers.message(str,...)
str = format(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
-- this will be reorganized:
function nodes.show_list(head, message)
if message then
texio.write_nl(message)
end
for n in traverse(head) do
texio.write_nl(tostring(n))
end
end
function nodes.check_glyphs(head,message)
local t = { }
for g in traverse_id(glyph,head) do
t[#t+1] = format("U+%04X:%s",g.char,g.subtype)
end
if #t > 0 then
logs.report(message or "nodes","%s glyphs: %s",#t,concat(t," "))
end
return false
end
function nodes.tosequence(start,stop,compact)
if start then
local t = { }
while start do
if start.id == glyph then
local c = start.char
if compact then
if start.components then
t[#t+1] = nodes.tosequence(start.components,nil,compact)
else
t[#t+1] = format("%s",utfchar(c))
end
else
t[#t+1] = format("U+%04X:%s",c,utfchar(c))
end
else
if compact then
t[#t+1] = "[]"
else
t[#t+1] = match(tostring(start),": (%S+)")
end
end
if start == stop then
break
else
start = start.next
end
end
if compact then
return concat(t)
else
return concat(t," ")
end
else
return "[empty]"
end
end
function nodes.report(t,done)
if done then
if status.output_active then
logs.report("nodes","output, changed, %s nodes",nodes.count(t))
else
texio.write("nodes","normal, changed, %s nodes",nodes.count(t))
end
else
if status.output_active then
logs.report("nodes","output, unchanged, %s nodes",nodes.count(t))
else
texio.write("nodes","normal, unchanged, %s nodes",nodes.count(t))
end
end
end
function nodes.pack_list(head)
local t = { }
for n in traverse(head) do
t[#t+1] = tostring(n)
end
return t
end
function nodes.ids_to_string(head,tail)
local t, last_id, last_n = { }, nil, 0
for n in traverse_nodes(head,tail) do
local id = n.id
if not last_id then
last_id, last_n = id, 1
elseif last_id == id then
last_n = last_n + 1
else
if last_n > 1 then
t[#t+1] = format("[%s*%s]",last_n,node_type(last_id) or "?")
else
t[#t+1] = format("[%s]",node_type(last_id) or "?")
end
last_id, last_n = id, 1
end
end
if not last_id then
t[#t+1] = "no nodes"
elseif last_n > 1 then
t[#t+1] = format("[%s*%s]",last_n,node_type(last_id) or "?")
else
t[#t+1] = format("[%s]",node_type(last_id) or "?")
end
return concat(t," ")
end
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