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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
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 lmtx_mode = nil
local function lmtxmode()
if lmtx_mode == nil then
lmtx_mode = CONTEXTLMTXMODE > 0 and drivers and drivers.lmtxversion
end
return lmtx_mode
end
codeinjections.lmtxmode = lmtxmode
function backends.install(what)
if type(what) == "string" then
local backend = backends[what]
if backend then
if trace then
if backend.comment then
report("initializing backend %a, %a",what,backend.comment)
else
report("initializing backend %a",what)
end
end
backends.current = what
for category, default in next, defaults do
local target = backends[category]
local plugin = backend [category]
setmetatableindex(plugin, default)
setmetatableindex(target, plugin)
end
elseif trace then
report("no backend named %a",what)
end
end
end
statistics.register("used backend", function()
local bc = backends.current
if bc ~= "unknown" then
local lmtx = lmtxmode()
local cmnt = backends[bc].comment or "no comment"
if lmtx then
return format("lmtx version %0.2f, %s (%s)",lmtx,bc,cmnt)
else
return format("%s (%s)",bc,cmnt)
end
else
return nil
end
end)
local comment = { "comment", "" }
tables.vfspecials = allocate {
red = comment,
green = comment,
blue = comment,
black = comment,
startslant = comment,
stopslant = comment,
}
-- 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
function backends.timestamp()
return os.date("%Y-%m-%dT%X") .. os.timezone(true)
end
-- Also here:
local paper_width = 0
local paper_height = 0
function codeinjections.setpagedimensions(paperwidth,paperheight)
if paperwidth then
paper_width = paperwidth
end
if paperheight then
paper_height = paperheight
end
if not lmtxmode() then
texset("global","pageheight",paper_height)
texset("global","pagewidth", paper_width)
end
return paper_width, paper_height
end
function codeinjections.getpagedimensions()
return paper_width, paper_height
end
implement {
name = "shipoutoffset",
actions = function()
context(lmtxmode() and "0pt" or "-1in") -- the old tex offset
end
}
-- could also be codeinjections
function backends.noflatelua()
return status.late_callbacks or 0
end
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