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if not modules then modules = { } end modules ['node-pro'] = {
version = 1.001,
comment = "companion to node-ini.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local utf = unicode.utf8
local format, concat = string.format, table.concat
local trace_callbacks = false trackers.register("nodes.callbacks", function(v) trace_callbacks = v end)
local glyph = node.id('glyph')
local free_node = node.free
local first_character = node.first_character
nodes.processors = nodes.processors or { }
-- 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
lists = lists or { }
chars = chars or { }
words = words or { } -- not used yet
local actions = tasks.actions("processors",2) -- head, where, boolean
local n = 0
local function reconstruct(head)
local t = { }
local h = head
while h do
local id = h.id
if id == glyph then
t[#t+1] = utf.char(h.char)
else
t[#t+1] = "[]"
end
h = h.next
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
texio.write_nl(format("%s %s: %s, group: %s, nodes: %s -> %s, string: %s",what,n,state,groupcode,before,after,reconstruct(head)))
else
texio.write_nl(format("%s %s: %s, group: %s, nodes: %s -> %s",what,n,state,groupcode,before,after))
end
end
nodes.processors.enabled = true -- thsi will become a proper state (like trackers)
function nodes.processors.pre_linebreak_filter(head,groupcode)
local first, found = first_character(head)
if found then
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("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)
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
function nodes.processors.hpack_filter(head,groupcode)
local first, found = first_character(head)
if found then
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("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)
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
callback.register('pre_linebreak_filter', nodes.processors.pre_linebreak_filter)
callback.register('hpack_filter' , nodes.processors.hpack_filter)
local actions = tasks.actions("finalizers",2) -- head, where, boolean
-- beware, these are packaged boxes so no first_character test
-- maybe some day a hash with valid groupcodes
--
-- beware, much can pass twice, for instance vadjust passes two times
function nodes.processors.post_linebreak_filter(head,groupcode)
--~ local first, found = first_character(head)
--~ if found then
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("finalizer","changed",head,groupcode,before,after,true)
else
tracer("finalizer","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
--~ elseif trace_callbacks then
--~ local n = nodes.count(head,false)
--~ tracer("finalizer","no chars",head,groupcode,n,n)
--~ end
--~ return true
end
callback.register('post_linebreak_filter', nodes.processors.post_linebreak_filter)
statistics.register("h-node processing time", function()
if statistics.elapsedindeed(nodes) then
return format("%s seconds including kernel", statistics.elapsedtime(nodes))
end
end)
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