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if not modules then modules = { } end modules ['node-pro'] = {
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"
}
local trace_callbacks = false trackers .register("nodes.callbacks", function(v) trace_callbacks = v end)
local force_processors = false directives.register("nodes.processors.force", function(v) force_processors = v end)
local report_nodes = logs.reporter("nodes","processors")
local nodes = nodes
local tasks = nodes.tasks
local nuts = nodes.nuts
nodes.processors = nodes.processors or { }
local processors = nodes.processors
-- vbox: grouptype: vbox vtop output split_off split_keep | box_type: exactly|aditional
-- hbox: grouptype: hbox adjusted_hbox(=hbox_in_vmode) | box_type: exactly|aditional
local actions = tasks.actions("processors")
do
local tonut = nuts.tonut
local isglyph = nuts.isglyph
local getnext = nuts.getnext
local utfchar = utf.char
local concat = table.concat
local n = 0
local function reconstruct(head) -- we probably have a better one
local t, n, h = { }, 0, tonut(head)
while h do
n = n + 1
local char, id = isglyph(h)
if char then -- todo: disc etc
t[n] = utfchar(char)
else
t[n] = "[]"
end
h = getnext(h)
end
return concat(t)
end
function processors.tracer(what,state,head,groupcode,before,after,show)
if not groupcode then
groupcode = "unknown"
elseif groupcode == "" then
groupcode = "mvl"
end
n = n + 1
if show then
report_nodes("%s: location %a, state %a, group %a, # before %a, # after %s, stream: %s",what,n,state,groupcode,before,after,reconstruct(head))
else
report_nodes("%s: location %a, state %a, group %a, # before %a, # after %s",what,n,state,groupcode,before,after)
end
end
end
local tracer = processors.tracer
processors.enabled = true -- this will become a proper state (like trackers)
do
local has_glyph = nodes.has_glyph
function processors.pre_linebreak_filter(head,groupcode) -- ,size,packtype,direction
local found = force_processors or has_glyph(head)
if found then
if trace_callbacks then
local before = nodes.count(head,true)
local head, done = actions(head,groupcode) -- ,size,packtype,direction
local after = nodes.count(head,true)
if done then
tracer("pre_linebreak","changed",head,groupcode,before,after,true)
else
tracer("pre_linebreak","unchanged",head,groupcode,before,after,true)
end
return done and head or true
else
local head, done = actions(head,groupcode) -- ,size,packtype,direction
return done and head or true
end
elseif trace_callbacks then
local n = nodes.count(head,false)
tracer("pre_linebreak","no chars",head,groupcode,n,n)
end
return true
end
local function hpack_filter(head,groupcode,size,packtype,direction,attributes)
local found = force_processors or has_glyph(head)
if found then
if trace_callbacks then
local before = nodes.count(head,true)
local head, done = actions(head,groupcode,size,packtype,direction,attributes)
local after = nodes.count(head,true)
if done then
tracer("hpack","changed",head,groupcode,before,after,true)
else
tracer("hpack","unchanged",head,groupcode,before,after,true)
end
return done and head or true
else
local head, done = actions(head,groupcode,size,packtype,direction,attributes)
return done and head or true
end
elseif trace_callbacks then
local n = nodes.count(head,false)
tracer("hpack","no chars",head,groupcode,n,n)
end
return true
end
processors.hpack_filter = hpack_filter
do
local setfield = nodes.setfield
local hpack = nodes.hpack
function nodes.fullhpack(head,...)
local ok = hpack_filter(head)
if not done or done == true then
ok = head
end
local hp, b = hpack(ok,...)
setfield(hp,"prev",nil)
setfield(hp,"next",nil)
return hp, b
end
end
do
local setboth = nuts.setboth
local hpack = nuts.hpack
function nuts.fullhpack(head,...)
local ok = hpack_filter(tonode(head))
if not done or done == true then
ok = head
else
ok = tonut(ok)
end
local hp, b = hpack(...)
setboth(hp)
return hp, b
end
end
callbacks.register('pre_linebreak_filter', processors.pre_linebreak_filter, "all kind of horizontal manipulations (before par break)")
callbacks.register('hpack_filter' , processors.hpack_filter, "all kind of horizontal manipulations (before hbox creation)")
end
do
local actions = tasks.actions("finalizers") -- head, where
-- beware, these are packaged boxes so no first_glyph test
-- maybe some day a hash with valid groupcodes
--
-- beware, much can pass twice, for instance vadjust passes two times
--
-- something weird here .. group mvl when making a vbox
function processors.post_linebreak_filter(head,groupcode)
if trace_callbacks then
local before = nodes.count(head,true)
local head, done = actions(head,groupcode)
local after = nodes.count(head,true)
if done then
tracer("post_linebreak","changed",head,groupcode,before,after,true)
else
tracer("post_linebreak","unchanged",head,groupcode,before,after,true)
end
return done and head or true
else
local head, done = actions(head,groupcode)
return done and head or true
end
end
callbacks.register('post_linebreak_filter', processors.post_linebreak_filter,"all kind of horizontal manipulations (after par break)")
end
do
local texnest = tex.nest
local getlist = nodes.getlist
local setlist = nodes.setlist
local getsubtype = nodes.getsubtype
local line_code = nodes.listcodes.line
local actions = tasks.actions("contributers")
function processors.contribute_filter(groupcode)
if groupcode == "box" then -- "pre_box"
local whatever = texnest[texnest.ptr]
if whatever then
local line = whatever.tail
if line and getsubtype(line) == line_code then
local head = getlist(line)
if head then
local okay, done = actions(head,groupcode,line)
if okay and okay ~= head then
setlist(line,okay)
end
end
end
end
end
end
callbacks.register('contribute_filter', processors.contribute_filter,"things done with lines")
end
statistics.register("h-node processing time", function()
return statistics.elapsedseconds(nodes,"including kernel") -- hm, ok here?
end)
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