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if not modules then modules = { } end modules ['node-shp'] = {
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 nodes, node = nodes, node
local next, type = next, type
local format = string.format
local concat, sortedpairs = table.concat, table.sortedpairs
local setmetatableindex = table.setmetatableindex
local nodecodes = nodes.nodecodes
local whatsitcodes = nodes.whatsitcodes
local tasks = nodes.tasks
local handlers = nodes.handlers
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local disc_code = nodecodes.disc
local mark_code = nodecodes.mark
local kern_code = nodecodes.kern
local glue_code = nodecodes.glue
local whatsit_code = nodecodes.whatsit
local texgetbox = tex.getbox
local free_node = node.free
local remove_node = node.remove
local traverse_nodes = node.traverse
local removables = {
[whatsitcodes.open] = true,
[whatsitcodes.close] = true,
[whatsitcodes.write] = true,
[whatsitcodes.pdfdest] = true,
[whatsitcodes.pdfsavepos] = true,
[whatsitcodes.latelua] = true,
}
local function cleanup_redundant(head)
local start = head
while start do
local id = start.id
if id == disc_code then
head, start = remove_node(head,start,true)
-- elseif id == glue_code then
-- if start.writable then
-- start = start.next
-- elseif some_complex_check_on_glue_spec then
-- head, start = remove_node(head,start,true)
-- else
-- start = start.next
-- end
elseif id == kern_code then
if start.kern == 0 then
head, start = remove_node(head,start,true)
else
start = start.next
end
elseif id == mark_code then
head, start = remove_node(head,start,true)
elseif id == hlist_code or id == vlist_code then
local sl = start.list
if sl then
start.list = cleanup_redundant(sl)
start = start.next
else
head, start = remove_node(head,start,true)
end
else
start = start.next
end
end
return head
end
local function cleanup_flushed(head) -- rough
local start = head
while start do
local id = start.id
if id == whatsit_code and removables[start.subtype] then
head, start = remove_node(head,start,true)
elseif id == hlist_code or id == vlist_code then
local sl = start.list
if sl then
start.list = cleanup_flushed(sl)
start = start.next
else
head, start = remove_node(head,start,true)
end
else
start = start.next
end
end
return head
end
function handlers.cleanuppage(head)
-- about 10% of the nodes make no sense for the backend
return cleanup_redundant(head), true
end
function handlers.cleanupbox(head)
return cleanup_flushed(head), true
end
directives.register("backend.cleanup", function()
tasks.enableaction("shipouts","nodes.handlers.cleanuppage")
end)
local actions = tasks.actions("shipouts") -- no extra arguments
function handlers.finalize(head) -- problem, attr loaded before node, todo ...
return actions(head)
end
function commands.cleanupbox(n)
cleanup_flushed(texgetbox(n))
end
-- handlers.finalize = actions
-- interface
function commands.finalizebox(n)
actions(texgetbox(n))
end
-- just in case we want to optimize lookups:
local frequencies = { }
nodes.tracers.frequencies = frequencies
local data = { }
local done = false
setmetatableindex(data,function(t,k)
local v = { }
setmetatableindex(v,function(t,k)
local v = { }
t[k] = v
setmetatableindex(v,function(t,k)
t[k] = 0
return 0
end)
return v
end)
t[k] = v
return v
end)
local function count(head,data,subcategory)
-- no components, pre, post, replace .. can maybe an option .. but
-- we use this for optimization so it makes sense to look the the
-- main node only
for n in traverse_nodes(head) do
local id = n.id
local dn = data[nodecodes[n.id]]
dn[subcategory] = dn[subcategory] + 1
if id == hlist_code or id == vlist_code then
count(n.list,data,subcategory)
end
end
end
local function register(category,subcategory)
return function(head)
done = true
count(head,data[category],subcategory)
return head, false
end
end
frequencies.register = register
frequencies.filename = nil
trackers.register("nodes.frequencies",function(v)
if type(v) == "string" then
frequencies.filename = v
end
handlers.frequencies_shipouts_before = register("shipouts", "begin")
handlers.frequencies_shipouts_after = register("shipouts", "end")
handlers.frequencies_processors_before = register("processors", "begin")
handlers.frequencies_processors_after = register("processors", "end")
tasks.prependaction("shipouts", "before", "nodes.handlers.frequencies_shipouts_before")
tasks.appendaction ("shipouts", "after", "nodes.handlers.frequencies_shipouts_after")
tasks.prependaction("processors", "before", "nodes.handlers.frequencies_processors_before")
tasks.appendaction ("processors", "after", "nodes.handlers.frequencies_processors_after")
end)
statistics.register("node frequencies", function()
if done then
local filename = frequencies.filename or (tex.jobname .. "-frequencies.lua")
io.savedata(filename,table.serialize(data,true))
return format("saved in %q",filename)
end
end)
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