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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 report = logs.reporter("memstream")
local data = { }
local trace = false
function resolvers.finders.memstream(specification)
local original = specification.original
local identifier = data[original]
if identifier then
if trace then
report("reusing %a",identifier)
end
return identifier
end
local stream = io.loaddata(specification.path)
if not stream or stream == "" then
return resolvers.finders.notfound()
end
local memstream = { epdf.openMemStream(stream,#stream,original) }
local identifier = memstream[2]
if not identifier then
report("invalid %a",name)
identifier = "invalid-memstream"
elseif trace then
report("using %a",identifier)
end
data[original] = identifier
return identifier
end
function resolvers.setmemstream(name,stream)
local original = "memstream:///" .. name
local memstream = { epdf.openMemStream(stream,#stream,original) }
local identifier = memstream[2]
if not identifier then
report("invalid %a",name)
identifier = "invalid-memstream"
elseif trace then
report("setting %a",identifier)
end
data[original] = identifier
end
figures.identifiers.list[#figures.identifiers.list+1] = function(specification)
local name = specification.request.name
if name and data[name] then
specification.status.status = 1
specification.used.fullname = name
end
end
figures.setmemstream = resolvers.setmemstream
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