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if not modules then modules = { } end modules ['node-mig'] = {
version = 1.001,
comment = "companion to node-mig.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- todo: insert_after
local format = string.format
local trace_migrations = false trackers.register("nodes.migrations", function(v) trace_migrations = v end)
local report_nodes = logs.reporter("nodes","migrations")
local attributes = attributes
local nodes = nodes
local nuts = nodes.nuts
local tonut = nuts.tonut
local getnext = nuts.getnext
local getid = nuts.getid
local getlist = nuts.getlist
local getprop = nuts.getprop
local setprop = nuts.setprop
local setlink = nuts.setlink
local setlist = nuts.setlist
local setprev = nuts.setprev
local setnext = nuts.setnext
local setboth = nuts.setboth
local remove_node = nuts.remove
local count = nuts.count
local nodecodes = nodes.nodecodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local insert_code = nodecodes.ins
local mark_code = nodecodes.mark
local a_migrated = attributes.private("migrated")
local trialtypesetting = context.trialtypesetting
local migrate_inserts = false
local migrate_marks = false
local t_inserts = 0
local t_marks = 0
local t_sweeps = 0
local function locate(head,first,last)
local current = head
while current do
local id = getid(current)
if id == vlist_code or id == hlist_code then
local list = getlist(current)
if list then
local l
l, first, last = locate(list,first,last)
if l ~= list then
setlist(current,l)
end
end
current = getnext(current)
elseif id == insert_code then
if migrate_inserts then
local insert
head, current, insert = remove_node(head,current)
if first then
setnext(insert)
setlink(last,insert)
else
setboth(insert)
first = insert
end
last = insert
end
elseif id == mark_code then
if migrate_marks then
local mark
head, current, mark = remove_node(head,current)
if first then
setnext(mark)
setlink(last,mark)
else
setboth(mark)
first = mark
end
last = mark
end
else
current = getnext(current)
end
end
return head, first, last
end
function nodes.handlers.migrate(head,where)
if head and not trialtypesetting() then
if trace_migrations then
report_nodes("migration sweep %a",where)
end
local current = head
while current do
local id = getid(current)
if (id == vlist_code or id == hlist_code or id == insert_code) and not getprop(current,"migrated") then
setprop(current,"migrated",true)
local h = getlist(current)
if h then
t_sweeps = t_sweeps + 1
local first, last
while h do
local id = getid(h)
if id == vlist_code or id == hlist_code then
h, first, last = locate(h,first,last)
end
h = getnext(h)
end
if first then
if trace_migrations then
local ni = count(insert_code,first)
local nm = count(mark_code,first)
t_inserts = t_inserts + ni
t_marks = t_marks + nm
report_nodes("sweep %a, container %a, %s inserts and %s marks migrated outwards during %a",
t_sweeps,nodecodes[id],ni,nm,where)
end
local n = getnext(current)
if n then
setlink(last,n)
end
setlink(current,first)
current = last
end
end
end
current = getnext(current)
end
end
return head
end
statistics.register("node migrations", function()
if trace_migrations and t_sweeps > 0 then
return format("%s sweeps, %s inserts moved, %s marks moved",t_sweeps,t_inserts,t_marks)
end
end)
-- Since we started with mkiv we had it as experiment but it is about time
-- to have a more formal interface .. it's still optional due to possible
-- side effects.
local enableaction = nodes.tasks.enableaction
local disableaction = nodes.tasks.disableaction
local migrations = { }
nodes.migrations = migrations
local enabled = false
local function check()
if migrate_marks or migrate_inserts then
if not enabled then
enableaction("mvlbuilders", "nodes.handlers.migrate")
enableaction("processors", "nodes.handlers.migrate")
enabled = true
end
else
if enabled then
disableaction("mvlbuilders", "nodes.handlers.migrate")
disableaction("processors", "nodes.handlers.migrate")
enabled = false
end
end
end
function migrations.setmarks(v)
migrate_marks = v
check()
end
function migrations.setinserts(v)
migrate_inserts = v
check()
end
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