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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"
}
--[[ldx--
<p>This module provides a (multipass) container for arbitrary data. It
replaces the twopass data mechanism.</p>
--ldx]]--
local tonumber = tonumber
local context, commands = context, commands
local trace_datasets = false trackers.register("job.datasets" , function(v) trace_datasets = v end)
local trace_pagestates = false trackers.register("job.pagestates", function(v) trace_pagestates = v end)
local report_dataset = logs.reporter("dataset")
local report_pagestate = logs.reporter("pagestate")
local allocate = utilities.storage.allocate
local settings_to_hash = utilities.parsers.settings_to_hash
local format = string.format
local texcount = tex.count
local v_yes = interfaces.variables.yes
local new_latelua = nodes.pool.latelua
local collected = allocate()
local tobesaved = allocate()
local datasets = {
collected = collected,
tobesaved = tobesaved,
}
job.datasets = datasets
local function initializer()
collected = datasets.collected
tobesaved = datasets.tobesaved
end
job.register('job.datasets.collected', tobesaved, initializer, nil)
local sets = { }
table.setmetatableindex(tobesaved, function(t,k)
local v = { }
t[k] = v
return v
end)
table.setmetatableindex(sets, function(t,k)
local v = {
index = 0,
order = 0,
}
t[k] = v
return v
end)
local function setdata(settings)
local name = settings.name
local tag = settings.tag
local data = settings.data
local list = tobesaved[name]
data = settings_to_hash(data) or { }
if not tag then
tag = #list + 1
else
tag = tonumber(tag) or tag -- autonumber saves keys
end
list[tag] = data
if settings.delay == v_yes then
local set = sets[name]
local index = set.index + 1
set.index = index
data.index = index
data.order = index
data.realpage = texcount.realpageno
if trace_datasets then
report_dataset("delayed: name %s, tag %s, index %s",name,tag,index)
end
elseif trace_datasets then
report_dataset("immediate: name %s, tag %s",name,tag)
end
return name, tag, data
end
datasets.setdata = setdata
function datasets.extend(name,tag)
local set = sets[name]
local order = set.order + 1
local realpage = texcount.realpageno
set.order = order
local t = tobesaved[name][tag]
t.realpage = realpage
t.order = order
if trace_datasets then
report_dataset("flushed: name %s, tag %s, page %s, index %s, order",name,tag,t.index or 0,order,realpage)
end
end
function datasets.getdata(name,tag,key,default)
local t = collected[name]
if t then
t = t[tag] or t[tonumber(tag)]
if t then
if key then
return t[key] or default
else
return t
end
elseif trace_datasets then
report_dataset("unknown: name %s, tag %s",name,tag)
end
elseif trace_datasets then
report_dataset("unknown: name %s",name)
end
return default
end
function commands.setdataset(settings)
local name, tag, data = setdata(settings)
if settings.delay ~= v_yes then
--
elseif type(tag) == "number" then
context(new_latelua(format("job.datasets.extend(%q,%i)",name,tag)))
else
context(new_latelua(format("job.datasets.extend(%q,%q)",name,tag)))
end
end
function commands.datasetvariable(name,tag,key)
local t = collected[name]
t = t and (t[tag] or t[tonumber(tag)])
if t then
local s = t[key]
if s then
context(s)
end
end
end
--[[ldx--
<p>We also provide an efficient variant for page states.</p>
--ldx]]--
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, function(t,k)
local v = { }
t[k] = v
return v
end)
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 = texcount.realpageno
local data = realpage
list[tag] = data
if trace_pagestates then
report_pagestate("setting: name %s, tag %s, preset %s",name,tag,realpage)
end
return name, tag, data
end
pagestates.setstate = setstate
function pagestates.extend(name,tag)
local realpage = texcount.realpageno
if trace_pagestates then
report_pagestate("synchronizing: name %s, tag %s, preset %s",name,tag,realpage)
end
tobesaved[name][tag] = realpage
end
function pagestates.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("unknown: name %s, tag %s",name,tag)
end
elseif trace_pagestates then
report_pagestate("unknown: name %s",name)
end
return default
end
function commands.setpagestate(settings)
local name, tag, data = setstate(settings)
if type(tag) == "number" then
context(new_latelua(format("job.pagestates.extend(%q,%i)",name,tag)))
else
context(new_latelua(format("job.pagestates.extend(%q,%q)",name,tag)))
end
end
function commands.pagestaterealpage(name,tag)
local t = collected[name]
t = t and (t[tag] or t[tonumber(tag)])
if t then
context(t)
end
end
function commands.setpagestaterealpageno(name,tag)
local t = collected[name]
t = t and (t[tag] or t[tonumber(tag)])
if t then
texcount.realpagestateno = t
else
texcount.realpagestateno = texcount.realpageno
end
end
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