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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 utfchar = utf.char
local format, concat = string.format, table.concat
local trace_callbacks = false trackers.register("nodes.callbacks", function(v) trace_callbacks = v end)
local report_nodes = logs.reporter("nodes","processors")
local nodes = nodes
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local tasks = nodes.tasks
local nuts = nodes.nuts
local first_glyph = nodes.first_glyph
local has_glyph = nodes.has_glyph
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 getid = nuts.getid
local getchar = nuts.getchar
local getnext = nuts.getnext
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 id = getid(h)
if id == glyph_code then -- todo: disc etc
t[n] = utfchar(getchar(h))
else
t[n] = "[]"
end
h = getnext(h)
end
return concat(t)
end
local function 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
processors.tracer = tracer
end
processors.enabled = true -- this will become a proper state (like trackers)
function processors.pre_linebreak_filter(head,groupcode) -- ,size,packtype,direction
-- local first, found = first_glyph(head) -- they really need to be glyphs
local found = 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 enabled = true
function processors.hpack_filter(head,groupcode,size,packtype,direction)
if enabled then
-- local first, found = first_glyph(head) -- they really need to be glyphs
local found = 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("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)
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
end
return true
end
do
local setfield = nodes.setfield
local hpack = nodes.hpack
function nodes.fasthpack(...) -- todo: pass explicit arguments
enabled = false
local hp, b = hpack(...)
setfield(hp,"prev",nil)
setfield(hp,"next",nil)
enabled = true
return hp, b
end
end
do
local setfield = nuts.setfield
local hpack = nuts.hpack
function nuts.fasthpack(...) -- todo: pass explicit arguments
enabled = false
local hp, b = hpack(...)
setfield(hp,"prev",nil)
setfield(hp,"next",nil)
enabled = true
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)")
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)")
statistics.register("h-node processing time", function()
return statistics.elapsedseconds(nodes,"including kernel") -- hm, ok here?
end)
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