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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 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]]--
local nodes = nodes
local context = context
local storage = storage
local commands = commands
local implement = interfaces.implement
attributes = attributes or { }
local attributes = attributes
local sharedstorage = storage.shared
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>private attributes are used by the system and public ones are for users. We use dedicated
ranges of numbers for them. Of course a the <l n='context'/> end a private attribute can be
accessible too, so a private attribute can have a public appearance.</p>
--ldx]]--
sharedstorage.attributes_last_private = sharedstorage.attributes_last_private or 15 -- very private
sharedstorage.attributes_last_public = sharedstorage.attributes_last_public or 1024 -- less private
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
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
function attributes.public(name) -- at the lua end (hidden from user)
local number = numbers[name]
if not number then
local last = sharedstorage.attributes_last_public
if last < 65535 then
last = last + 1
sharedstorage.attributes_last_public = last
else
report_attribute("no more room for public attributes")
os.exit()
end
number = last
numbers[name], names[number], list[number] = number, name, { }
end
return number
end
attributes.system = attributes.private
function attributes.define(name,category)
return (attributes[category or "public"] or attributes["public"])(name)
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 = a.number
local value = 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
-- rather special (can be optimized)
local store = { }
function attributes.save(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 attributes.restore(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
implement {
name = "defineattribute",
arguments = "2 strings",
actions = { attributes.define, context }
}
-- interface
implement {
name = "showattributes",
actions = attributes.showcurrent
}
implement {
name = "savecurrentattributes",
arguments = "string",
actions = attributes.save
}
implement {
name = "restorecurrentattributes",
arguments = "string",
actions = attributes.restore
}
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