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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
local sind, cosd, abs = math.sind, math.cosd, math.abs
local insert, remove = table.insert, table.remove
local unpack = unpack
backends = backends or { }
local backends = backends
local trace_backend = false trackers.register("backend.initializers", function(v) trace_finalizers = v end)
local report = logs.reporter("backend")
local report_backend = logs.reporter("backend","initializing")
local allocate = utilities.storage.allocate
local setmetatableindex = table.setmetatableindex
local setaction = nodes.tasks.setaction
local scanners = tokens.scanners
local scannumber = scanners.number
local scankeyword = scanners.keyword
local scancount = scanners.count
local scanstring = scanners.string
local scanners = interfaces.scanners
local implement = interfaces.implement
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 = ((tonumber(CONTEXTLMTXMODE) or 0) > 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_backend then
if backend.comment then
report_backend("initializing backend %a, %a",what,backend.comment)
else
report_backend("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_backend then
report_backend("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 == interfaces.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
--
local stack = { }
local restore = true -- false
local nodepool = nodes.pool
local savenode = nodepool.save
local restorenode = nodepool.restore
local setmatrixnode = nodepool.setmatrix
updaters.register("backend.update",function()
savenode = nodepool.save
restorenode = nodepool.restore
setmatrixnode = nodepool.setmatrix
end)
local function stopsomething()
local top = remove(stack)
if top == false then
-- not wrapped
elseif top == true then
context(restorenode())
elseif top then
context(setmatrixnode(unpack(top))) -- not really needed anymore
context(restorenode())
else
-- nesting error
end
end
local function startrotation()
local a = scannumber()
if a == 0 then
insert(stack,false)
else
local s, c = sind(a), cosd(a)
if abs(s) < 0.000001 then
s = 0 -- otherwise funny -0.00000
end
if abs(c) < 0.000001 then
c = 0 -- otherwise funny -0.00000
end
context(savenode())
context(setmatrixnode(c,s,-s,c))
insert(stack,restore and { c, -s, s, c } or true)
end
end
implement { name = "startrotation", actions = startrotation }
implement { name = "stoprotation", actions = stopsomething }
local function startscaling() -- at the tex end we use sx and sy instead of rx and ry
local rx, ry = 1, 1
while true do
if scankeyword("rx") then
rx = scannumber()
elseif scankeyword("ry") then
ry = scannumber()
-- elseif scankeyword("revert") then
-- local top = stack[#stack]
-- if top then
-- rx = top[1]
-- ry = top[4]
-- else
-- rx = 1
-- ry = 1
-- end
else
break
end
end
if rx == 1 and ry == 1 then
insert(stack,false)
else
if rx == 0 then
rx = 0.0001
end
if ry == 0 then
ry = 0.0001
end
context(savenode())
context(setmatrixnode(rx,0,0,ry))
insert(stack,restore and { 1/rx, 0, 0, 1/ry } or true)
end
end
implement { name = "startscaling", actions = startscaling }
implement { name = "stopscaling", actions = stopsomething }
local function startmatrix() -- rx sx sy ry -- tx, ty
local rx, sx, sy, ry = 1, 0, 0, 1
while true do
if scankeyword("rx") then rx = scannumber()
elseif scankeyword("ry") then ry = scannumber()
elseif scankeyword("sx") then sx = scannumber()
elseif scankeyword("sy") then sy = scannumber()
else break end
end
if rx == 1 and sx == 0 and sy == 0 and ry == 1 then
insert(stack,false)
else
context(savenode())
context(setmatrixnode(rx,sx,sy,ry))
insert(stack,store and { -rx, -sx, -sy, -ry } or true)
end
end
implement { name = "startmatrix", actions = startmatrix }
implement { name = "stopmatrix", actions = stopsomething }
local function startmirroring()
context(setmatrixnode(-1,0,0,1))
end
implement { name = "startmirroring", actions = startmirroring }
implement { name = "stopmirroring", actions = startmirroring } -- not: stopsomething
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