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if not modules then modules = { } end modules ['data-met'] = {
version = 1.100,
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 find, format = string.find, string.format
local sequenced = table.sequenced
local addurlscheme, urlhashed = url.addscheme, url.hashed
local trace_locating = false
trackers.register("resolvers.locating", function(v) trace_methods = v end)
trackers.register("resolvers.methods", function(v) trace_methods = v end)
--~ trace_methods = true
local report_methods = logs.reporter("resolvers","methods")
local allocate = utilities.storage.allocate
local resolvers = resolvers
local registered = { }
local function splitmethod(filename) -- todo: filetype in specification
if not filename then
return { scheme = "unknown", original = filename }
end
if type(filename) == "table" then
return filename -- already split
end
filename = file.collapsepath(filename)
if not find(filename,"://") then
return { scheme = "file", path = filename, original = filename, filename = filename }
end
local specification = url.hashed(filename)
if not specification.scheme or specification.scheme == "" then
return { scheme = "file", path = filename, original = filename, filename = filename }
else
return specification
end
end
resolvers.splitmethod = splitmethod -- bad name but ok
-- the second argument is always analyzed (saves time later on) and the original
-- gets passed as original but also as argument
local function methodhandler(what,first,...) -- filename can be nil or false
local method = registered[what]
if method then
local how, namespace = method.how, method.namespace
if how == "uri" or how == "url" then
local specification = splitmethod(first)
local scheme = specification.scheme
local resolver = namespace and namespace[scheme]
if resolver then
if trace_methods then
report_methods("resolver: method=%s, how=%s, scheme=%s, argument=%s",what,how,scheme,first)
end
return resolver(specification,...)
else
resolver = namespace.default or namespace.file
if resolver then
if trace_methods then
report_methods("resolver: method=%s, how=%s, default, argument=%s",what,how,first)
end
return resolver(specification,...)
elseif trace_methods then
report_methods("resolver: method=%s, how=%s, no handler",what,how)
end
end
elseif how == "tag" then
local resolver = namespace and namespace[first]
if resolver then
if trace_methods then
report_methods("resolver: method=%s, how=%s, tag=%s",what,how,first)
end
return resolver(...)
else
resolver = namespace.default or namespace.file
if resolver then
if trace_methods then
report_methods("resolver: method=%s, how=%s, default",what,how)
end
return resolver(...)
elseif trace_methods then
report_methods("resolver: method=%s, how=%s, unknown",what,how)
end
end
end
else
report_methods("resolver: method=%s, unknown",what)
end
end
resolvers.methodhandler = methodhandler
function resolvers.registermethod(name,namespace,how)
registered[name] = { how = how or "tag", namespace = namespace }
namespace["byscheme"] = function(scheme,filename,...)
if scheme == "file" then
return methodhandler(name,filename,...)
else
return methodhandler(name,addurlscheme(filename,scheme),...)
end
end
end
local concatinators = allocate { notfound = file.join } -- concatinate paths
local locators = allocate { notfound = function() end } -- locate databases
local hashers = allocate { notfound = function() end } -- load databases
local generators = allocate { notfound = function() end } -- generate databases
resolvers.concatinators = concatinators
resolvers.locators = locators
resolvers.hashers = hashers
resolvers.generators = generators
local registermethod = resolvers.registermethod
registermethod("concatinators",concatinators,"tag")
registermethod("locators", locators, "uri")
registermethod("hashers", hashers, "uri")
registermethod("generators", generators, "uri")
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