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if not modules then modules = { } end modules ['grph-mem'] = {
version = 1.001,
comment = "companion to grph-inc.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- very experimental and likely to change
--
-- \startluacode
-- figures.setmemstream("whatever",io.loaddata("t:/sources/cow.pdf"))
-- \stopluacode
--
-- \externalfigure[memstream:///t:/sources/cow.pdf]
-- \externalfigure[memstream:///whatever]
local gsub = string.gsub
local report = logs.reporter("memstream")
local trace = false trackers.register ("graphics.memstreams", function(v) trace = v end)
local data = { }
local function setmemstream(name,stream,once)
if once and data[name] then
if trace then
report("not overloading %a",name) --
end
return data[name]
end
local kind = figures.guessfromstring(stream)
local identifier = false
if kind == "pdf" then
identifier = pdfe.new(stream,#stream,name)
if not identifier then
report("no valid pdf stream %a",name)
elseif trace then
report("setting %a with identifier %a",name,identifier)
end
else
identifier = "m_k_i_v_memstream_" .. name .. "." .. kind
io.savedata(identifier,stream)
end
if not identifier then
identifier = "invalid-memstream"
end
data[name] = identifier
return identifier
end
resolvers.setmemstream = setmemstream
function resolvers.finders.memstream(specification)
local name = specification.path
local identifier = data[name]
if identifier then
if trace then
report("reusing %a with identifier %a",name,identifier)
end
return identifier
end
local stream = io.loaddata(name)
if stream and stream ~= "" then
return setmemstream(name,stream)
end
if trace then
report("no valid memstream %a",name)
end
return resolvers.finders.notfound()
end
local flush = { }
function resolvers.resetmemstream(name,afterpage)
if afterpage then
flush[#flush+1] = name
end
end
luatex.registerpageactions(function()
if #flush > 0 then
for i=1,#flush do
local identifier = data[name]
if identifier then
os.remove(identifier)
data[name] = nil
end
end
flush = { }
end
end)
figures.identifiers.list[#figures.identifiers.list+1] = function(specification)
local name = specification.request.name
if name then
local base = gsub(name,"^memstream:///","")
if base ~= name then
local identifier = data[base]
if identifier then
if trace then
report("requested %a has identifier %s",name,identifier)
end
specification.status.status = 1
specification.used.fullname = name
else
if trace then
report("requested %a is not found",name)
end
end
end
end
end
figures.setmemstream = resolvers.setmemstream
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