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if not modules then modules = { } end modules ['data-vir'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local formatters, validstrings = string.formatters, string.valid
local trace_virtual = false
local report_virtual = logs.reporter("resolvers","virtual")
trackers.register("resolvers.locating", function(v) trace_virtual = v end)
trackers.register("resolvers.virtual", function(v) trace_virtual = v end)
local resolvers = resolvers
local finders, openers, loaders, savers = resolvers.finders, resolvers.openers, resolvers.loaders, resolvers.savers
local data = { }
local n = 0 -- hm, number can be query
local f_virtual = formatters["virtual://%s.%s"]
function savers.virtual(specification,content)
n = n + 1 -- one number for all namespaces
local path = specification.path
local filename = f_virtual(path ~= "" and path or "virtualfile",n)
if trace_virtual then
report_virtual("saver: file %a saved",filename)
end
data[filename] = content
return filename
end
function finders.virtual(specification)
local original = specification.original
local d = data[original]
if d then
if trace_virtual then
report_virtual("finder: file %a found",original)
end
return original
else
if trace_virtual then
report_virtual("finder: unknown file %a",original)
end
return finders.notfound()
end
end
function openers.virtual(specification)
local original = specification.original
local d = data[original]
if d then
if trace_virtual then
report_virtual("opener: file %a opened",original)
end
data[original] = nil -- when we comment this we can have error messages
-- With utf-8 we signal that no regime is to be applied!
-- characters.showstring(d)
return openers.helpers.textopener("virtual",original,d,"utf-8")
else
if trace_virtual then
report_virtual("opener: file %a not found",original)
end
return openers.notfound()
end
end
function loaders.virtual(specification)
local original = specification.original
local d = data[original]
if d then
if trace_virtual then
report_virtual("loader: file %a loaded",original)
end
data[original] = nil
return true, d, #d
end
if trace_virtual then
report_virtual("loader: file %a not loaded",original)
end
return loaders.notfound()
end
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