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if not modules then modules = { } end modules ['back-ini'] = {
version = 1.001,
comment = "companion to back-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
local format = string.format
backends = backends or { }
local backends = backends
local context = context
local trace = false trackers.register("backend", function(v) trace = v end)
local report = logs.reporter("backend")
local allocate = utilities.storage.allocate
local setmetatableindex = table.setmetatableindex
local setaction = nodes.tasks.setaction
local implement = interfaces.implement
local variables = interfaces.variables
local texset = tex.set
local nodeinjections = { }
local codeinjections = { }
local registrations = { }
local tables = allocate()
local function nothing()
return nil
end
backends.nothing = nothing
local function donothing(t,k)
t[k] = nothing
return nothing
end
setmetatableindex(nodeinjections, donothing)
setmetatableindex(codeinjections, donothing)
setmetatableindex(registrations, donothing)
local defaults = {
nodeinjections = nodeinjections,
codeinjections = codeinjections,
registrations = registrations,
tables = tables,
}
backends.defaults = defaults -- so, when not in the specific namespace we need to register here (to be checked)
backends.nodeinjections = { } setmetatableindex(backends.nodeinjections, nodeinjections)
backends.codeinjections = { } setmetatableindex(backends.codeinjections, codeinjections)
backends.registrations = { } setmetatableindex(backends.registrations, registrations)
backends.tables = { } setmetatableindex(backends.tables, tables)
backends.current = "unknown"
local registered = table.setmetatableindex(function(t,k)
local v = {
name = k,
nodeinjections = { },
codeinjections = { },
registrations = { },
tables = { },
}
t[k] = v
return v
end)
backends.registered = registered
-- The binding feature is mostly there to prevent side effects of overloading
-- not so much for performance because there are not that many calls.
function backends.initialize(what)
if type(what) == "string" then
local backend = registered[what]
if backend then
if trace then
report("initializing backend %a",what)
end
for category, default in next, defaults do
local target = backends[category]
local plugin = backend [category]
setmetatableindex(plugin, default)
setmetatableindex(target, plugin)
end
--
backends.current = what
-- delayed / out-of-order locals: like lpdf.* (a few forward references)
updaters.apply("backends." .. what .. ".latebindings")
-- delayed / out-of-order locals: backends.[c|n]odeinjections.* (not all, only critical ones)
updaters.apply("backends.injections.latebindings")
elseif trace then
report("no backend named %a",what)
end
end
end
statistics.register("used backend", function()
local bc = backends.current
return bc ~= "unknown" and bc or nil
end)
-- can best be here
interfaces.implement {
name = "setrealspaces",
arguments = "string",
actions = function(v)
setaction("shipouts","nodes.handlers.accessibility",v == variables.yes)
end
}
-- moved to here
local included = table.setmetatableindex( {
context = true,
id = true,
metadata = true,
date = true,
id = true,
pdf = true,
}, function(t,k)
return true
end)
backends.included = included
-- could also be codeinjections
function backends.getcallbackstate()
return { count = status.late_callbacks or 0 }
end
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