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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 disccodes = nodes.disccodes
local tasks = nodes.tasks
local handlers = nodes.handlers
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local disc_code = nodecodes.disc
local whatsit_code = nodecodes.whatsit
local fulldisc_code = disccodes.discretionary
local texgetbox = tex.getbox
local implement = interfaces.implement
local nuts = nodes.nuts
local tonut = nuts.tonut
local tonode = nuts.tonode
local remove_node = nuts.remove
local traverse_nodes = nuts.traverse
local getfield = nuts.getfield
local setfield = nuts.setfield
local setlink = nuts.setlink
local setprev = nuts.setprev
local setnext = nuts.setnext
local getid = nuts.getid
local getdisc = nuts.getdisc
local getboth = nuts.getboth
local getnext = nuts.getnext
local getlist = nuts.getlist
local getsubtype = nuts.getsubtype
local setlist = nuts.setlist
local removables = {
[whatsitcodes.open] = true,
[whatsitcodes.close] = true,
[whatsitcodes.write] = true,
[whatsitcodes.savepos] = true,
[whatsitcodes.latelua] = true,
[whatsitcodes.pdfdest] = true,
}
-- About 10% of the nodes make no sense for the backend. By (at least)
-- removing the replace disc nodes, we can omit extensive checking in
-- the finalizer code (e.g. colors in disc nodes). Removing more nodes
-- (like marks) is not saving much and removing empty boxes is even
-- dangerous because we can rely on dimensions (e.g. in references).
local wipedisc = false -- we can use them in the export ... can be option
local function cleanup_redundant(head) -- better name is: flatten_page
local start = head
while start do
local id = getid(start)
if id == disc_code then
if getsubtype(start) == fulldisc_code then
local _, _, replace, _, _ tail = getdisc(start,true)
if replace then
local prev, next = getboth(start)
setfield(start,"replace",nil)
if start == head then
remove_node(head,start,true)
head = replace
else
remove_node(head,start,true)
end
if next then
setlink(tail,next)
end
if prev then
setlink(prev,replace)
else
setprev(replace) -- to be sure
end
start = next
elseif wipedisc then
-- pre and post can have values
head, start = remove_node(head,start,true)
else
start = getnext(start)
end
else
start = getnext(start)
end
elseif id == hlist_code or id == vlist_code then
local sl = getlist(start)
if sl then
local rl = cleanup_redundant(sl)
if rl ~= sl then
setlist(start,rl)
end
end
start = getnext(start)
else
start = getnext(start)
end
end
return head
end
local function cleanup_flushed(head) -- rough
local start = head
while start do
local id = getid(start)
if id == whatsit_code then
if removables[getsubtype(start)] then
head, start = remove_node(head,start,true)
else
start = getnext(start)
end
elseif id == hlist_code or id == vlist_code then
local sl = getlist(start)
if sl then
local rl = cleanup_flushed(sl)
if rl ~= sl then
setlist(start,rl)
end
end
start = getnext(start)
else
start = getnext(start)
end
end
return head
end
function handlers.cleanuppage(head)
return tonode(cleanup_redundant(tonut(head))), true
end
function handlers.cleanupbox(head)
return tonode(cleanup_flushed(tonut(head))), true
end
local actions = tasks.actions("shipouts") -- no extra arguments
function handlers.finalize(head) -- problem, attr loaded before node, todo ...
return actions(head)
end
-- handlers.finalize = actions
-- interface
implement { name = "cleanupbox", actions = { texgetbox, cleanup_flushed }, arguments = "integer" }
implement { name = "finalizebox", actions = { texgetbox, actions }, arguments = "integer" }
-- 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(tonut(head)) do
local id = getid(n)
local dn = data[nodecodes[id]] -- we could use id and then later convert to nodecodes
dn[subcategory] = dn[subcategory] + 1
if id == hlist_code or id == vlist_code then
count(getlist(n),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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