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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, tostring, type = tonumber, tostring, type
local context = context
local trace_datasets = false trackers.register("job.datasets" , function(v) trace_datasets = v end)
local report_dataset = logs.reporter("dataset")
local allocate = utilities.storage.allocate
local settings_to_hash = utilities.parsers.settings_to_hash
local texgetcount = tex.getcount
local texsetcount = tex.setcount
local v_yes = interfaces.variables.yes
local new_latelua = nodes.pool.latelua
local implement = interfaces.implement
local c_realpageno = tex.iscount("realpageno")
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]
if settings.convert and type(data) == "string" then
data = settings_to_hash(data)
end
if type(data) ~= "table" then
data = { data = data }
end
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 = texgetcount(c_realpageno)
if trace_datasets then
report_dataset("action %a, name %a, tag %a, index %a","assign delayed",name,tag,index)
end
elseif trace_datasets then
report_dataset("action %a, name %a, tag %a","assign immediate",name,tag)
end
return name, tag, data
end
datasets.setdata = setdata
function datasets.extend(name,tag)
if type(name) == "table" then
name, tag = name.name, name.tag
end
local set = sets[name]
local order = set.order + 1
local realpage = texgetcount(c_realpageno)
set.order = order
local t = tobesaved[name][tag]
t.realpage = realpage
t.order = order
if trace_datasets then
report_dataset("action %a, name %a, tag %a, page %a, index %a","flush by order",name,tag,t.index or 0,order,realpage)
end
end
function datasets.getdata(name,tag,key,default)
local t = collected[name]
if t == nil then
if trace_datasets then
report_dataset("error: unknown dataset, name %a",name)
end
elseif type(t) ~= "table" then
return t
else
t = t[tag] or t[tonumber(tag)]
if not t then
if trace_datasets then
report_dataset("error: unknown dataset, name %a, tag %a",name,tag)
end
elseif key then
return t[key] or default
else
return t
end
end
return default
end
local function setdataset(settings)
settings.convert = true
local name, tag = setdata(settings)
if settings.delay ~= v_yes then
--
else
context(new_latelua { action = job.datasets.extend, name = name, tag = tag })
end
end
local cache = table.setmetatableindex(function(t,k)
local v = table.load(k..".tuc")
if v then
v = v.job
if v then
v = v.datasets
if v then
v = v.collected
end
end
end
if not v then
v = { }
if trace_datasets then
report_dataset("error: unknown dataset job %a",k)
end
end
t[k] = v
return v
end)
local function datasetvariable(name,tag,key,cache)
local t = (cache or collected)[name]
if t == nil then
if trace_datasets then
report_dataset("error: unknown dataset, name %a, tag %a, not passed to tex",name) -- no tag
end
elseif type(t) ~= "table" then
context(tostring(t))
else
t = t and (t[tag] or t[tonumber(tag)])
if not t then
if trace_datasets then
report_dataset("error: unknown dataset, name %a, tag %a, not passed to tex",name,tag)
end
elseif type(t) == "table" then
local s = t[key]
if type(s) ~= "table" then
context(tostring(s))
elseif trace_datasets then
report_dataset("error: unknown dataset, name %a, tag %a, not passed to tex",name,tag)
end
end
end
end
local function datasetvariablefromjob(jobnname,name,tag,key)
datasetvariable(name,tag,key,cache[jobnname])
end
implement {
name = "setdataset",
actions = setdataset,
arguments = {
{
{ "name" },
{ "tag" },
{ "delay" },
{ "data" },
}
}
}
implement {
name = "datasetvariable",
actions = datasetvariable,
arguments = "3 strings",
}
implement {
name = "datasetvariablefromjob",
arguments = { "string", "string", "string", "string" },
actions = datasetvariablefromjob
}
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