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if not modules then modules = { } end modules ['strc-itm'] = {
version = 1.001,
comment = "companion to strc-itm.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local allocate = utilities.storage.allocate
local implement = interfaces.implement
local texsetcount = tex.setcount
local texsetdimen = tex.setdimen
local itemgroups = structures.itemgroups
local collected = allocate()
local tobesaved = allocate()
itemgroups.collected = collected
itemgroups.tobesaved = tobesaved
local function initializer()
collected = itemgroups.collected
tobesaved = itemgroups.tobesaved
end
if job then
job.register("structures.itemgroups.collected", tobesaved, initializer)
end
local c_strc_itemgroups_max_items = tex.iscount("c_strc_itemgroups_max_items")
local d_strc_itemgroups_max_width = tex.isdimen("d_strc_itemgroups_max_width")
-- We keep the counter at the Lua end so we can group the items within
-- an itemgroup which in turn makes for less passes when one itemgroup
-- entry is added or removed.
local counts = table.setmetatableindex("number")
local trialtypesetting = context.trialtypesetting
local function analyzeitemgroup(name,level)
local n = counts[name]
if level == 1 then
n = n + 1
counts[name] = n
end
local items = 0
local width = 0
local itemgroup = collected[name]
if itemgroup then
local entry = itemgroup[n]
if entry then
local l = entry[level]
if l then
items = l[1] or 0
width = l[2] or 0
end
end
end
texsetcount(c_strc_itemgroups_max_items,items)
texsetdimen(d_strc_itemgroups_max_width,width)
end
local function registeritemgroup(name,level,nofitems,maxwidth)
local n = counts[name]
if not trialtypesetting() then
local itemgroup = tobesaved[name]
if not itemgroup then
itemgroup = { }
tobesaved[name] = itemgroup
end
local entry = itemgroup[n]
if not entry then
entry = { }
itemgroup[n] = entry
end
entry[level] = { nofitems, maxwidth }
elseif level == 1 then
counts[name] = n - 1
end
end
implement {
name = "analyzeitemgroup",
actions = analyzeitemgroup,
arguments = { "string", "integer" }
}
implement {
name = "registeritemgroup",
actions = registeritemgroup,
arguments = { "string", "integer", "integer", "dimen" }
}
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