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if not modules then modules = { } end modules ['attr-ini'] = {
version = 1.001,
comment = "companion to attr-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local commands, context, nodes, storage = commands, context, nodes, storage
local next, type = next, type
--[[ldx--
<p>We start with a registration system for atributes so that we can use the
symbolic names later on.</p>
--ldx]]--
attributes = attributes or { }
local attributes = attributes
local sharedstorage = storage.shared
local texgetcount = tex.getcount
local texsetattribute = tex.setattribute
attributes.names = attributes.names or { }
attributes.numbers = attributes.numbers or { }
attributes.list = attributes.list or { }
attributes.states = attributes.states or { }
attributes.handlers = attributes.handlers or { }
attributes.unsetvalue = -0x7FFFFFFF
local names = attributes.names
local numbers = attributes.numbers
local list = attributes.list
storage.register("attributes/names", names, "attributes.names")
storage.register("attributes/numbers", numbers, "attributes.numbers")
storage.register("attributes/list", list, "attributes.list")
function attributes.define(name,number) -- at the tex end
if not numbers[name] then
numbers[name] = number
names[number] = name
list[number] = { }
end
end
--[[ldx--
<p>We reserve this one as we really want it to be always set (faster).</p>
--ldx]]--
names[0], numbers["fontdynamic"] = "fontdynamic", 0
--[[ldx--
<p>We can use the attributes in the range 127-255 (outside user space). These
are only used when no attribute is set at the \TEX\ end which normally
happens in <l n='context'/>.</p>
--ldx]]--
sharedstorage.attributes_last_private = sharedstorage.attributes_last_private or 127
-- to be considered (so that we can use an array access):
--
-- local private = { } attributes.private = private
--
-- setmetatable(private, {
-- __index = function(t,name)
-- local number = sharedstorage.attributes_last_private
-- if number < 1023 then -- texgetcount("minallocatedattribute") - 1
-- number = number + 1
-- sharedstorage.attributes_last_private = number
-- end
-- numbers[name], names[number], list[number] = number, name, { }
-- private[name] = number
-- return number
-- end,
-- __call = function(t,name)
-- return t[name]
-- end
-- } )
function attributes.private(name) -- at the lua end (hidden from user)
local number = numbers[name]
if not number then
local last = sharedstorage.attributes_last_private
if last < 1023 then -- texgetcount("minallocatedattribute") - 1
last = last + 1
sharedstorage.attributes_last_private = last
else
report_attribute("no more room for private attributes")
os.exit()
end
number = last
numbers[name], names[number], list[number] = number, name, { }
end
return number
end
-- tracers
local report_attribute = logs.reporter("attributes")
local function showlist(what,list)
if list then
local a = list.next
local i = 0
while a do
local number, value = a.number, a.value
i = i + 1
report_attribute("%S %2i: attribute %3i, value %4i, name %a",what,i,number,value,names[number])
a = a.next
end
end
end
function attributes.showcurrent()
showlist("current",node.current_attr())
end
function attributes.ofnode(n)
showlist(n,n.attr)
end
-- interface
commands.defineattribute = attributes.define
commands.showattributes = attributes.showcurrent
function commands.getprivateattribute(name)
context(attributes.private(name))
end
-- rather special
local store = { }
function commands.savecurrentattributes(name)
name = name or ""
local n = node.current_attr()
n = n and n.next
local t = { }
while n do
t[n.number] = n.value
n = n.next
end
store[name] = {
attr = t,
font = font.current(),
}
end
function commands.restorecurrentattributes(name)
name = name or ""
local t = store[name]
if t then
local attr = t.attr
local font = t.font
if attr then
for k, v in next, attr do
texsetattribute(k,v)
end
end
if font then
-- tex.font = font
context.getvalue(fonts.hashes.csnames[font]) -- we don't have a direct way yet (will discuss it with taco)
end
end
-- store[name] = nil
end
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