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if not modules then modules = { } end modules ['core-dat'] = {
version = 1.001,
comment = "companion to core-dat.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This module provides a (multipass) container for arbitrary data. It replaces the
-- twopass data mechanism.
local tonumber = tonumber
local context = context
local ctx_latelua = context.latelua
local trace_pagestates = false trackers.register("job.pagestates", function(v) trace_pagestates = v end)
local report_pagestate = logs.reporter("pagestate")
local allocate = utilities.storage.allocate
local texgetcount = tex.getcount
local texsetcount = tex.setcount
local new_latelua = nodes.pool.latelua
local implement = interfaces.implement
local getnamespace = interfaces.getnamespace
local c_realpageno = tex.iscount("realpageno")
local c_realpagestateno = tex.iscount("realpagestateno")
local collected = allocate()
local tobesaved = allocate()
local pagestates = {
collected = collected,
tobesaved = tobesaved,
}
job.pagestates = pagestates
local function initializer()
collected = pagestates.collected
tobesaved = pagestates.tobesaved
end
job.register("job.pagestates.collected", tobesaved, initializer, nil)
table.setmetatableindex(tobesaved, "table")
local function setstate(settings)
local name = settings.name
local tag = settings.tag
local list = tobesaved[name]
if not tag then
tag = #list + 1
else
tag = tonumber(tag) or tag -- autonumber saves keys
end
local realpage = texgetcount(c_realpageno)
local data = realpage
list[tag] = data
if trace_pagestates then
report_pagestate("action %a, name %a, tag %a, preset %a","set",name,tag,realpage)
end
return name, tag, data
end
local function extend(name,tag)
local realpage = texgetcount(c_realpageno)
if trace_pagestates then
report_pagestate("action %a, name %a, tag %a, preset %a","synchronize",name,tag,realpage)
end
tobesaved[name][tag] = realpage
end
local function realpage(name,tag,default)
local t = collected[name]
if t then
t = t[tag] or t[tonumber(tag)]
if t then
return tonumber(t or default)
elseif trace_pagestates then
report_pagestate("error: unknown dataset, name %a, tag %a",name,tag)
end
elseif trace_pagestates then
report_pagestate("error: unknown dataset, name %a, tag %a",name) -- nil
end
return default
end
local function realpageorder(name,tag)
local t = collected[name]
if t then
local p = t[tag]
if p then
local n = 1
for i=tag-1,1,-1 do
if t[i] == p then
n = n +1
end
end
return n
end
end
return 0
end
pagestates.setstate = setstate
pagestates.extend = extend
pagestates.realpage = realpage
pagestates.realpageorder = realpageorder
function pagestates.countervalue(name)
return name and texgetcount(getnamespace("pagestatecounter") .. name) or 0
end
local function setpagestate(settings)
local name, tag = setstate(settings)
-- context(new_latelua(function() extend(name,tag) end))
ctx_latelua(function() extend(name,tag) end)
end
local function setpagestaterealpageno(name,tag)
local t = collected[name]
t = t and (t[tag] or t[tonumber(tag)])
texsetcount("realpagestateno",t or texgetcount(c_realpageno))
end
implement {
name = "setpagestate",
actions = setpagestate,
arguments = {
{
{ "name" },
{ "tag" },
{ "delay" },
}
}
}
implement {
name = "pagestaterealpage",
actions = { realpage, context },
arguments = "2 strings",
}
implement {
name = "setpagestaterealpageno",
actions = setpagestaterealpageno,
arguments = "2 strings",
}
implement {
name = "pagestaterealpageorder",
actions = { realpageorder, context },
arguments = { "string", "integer" }
}
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