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if not modules then modules = { } end modules ['data-tar'] = {
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 format, find, match = string.format, string.find, string.match
local trace_locating = false trackers.register("resolvers.locating", function(v) trace_locating = v end)
local report_tar = logs.reporter("resolvers","tar")
-- We use a url syntax for accessing the tar file itself and file in it:
--
-- tar:///oeps.tar?name=bla/bla.tex
-- tar:///oeps.tar?tree=tex/texmf-local
local resolvers = resolvers
local findfile = resolvers.findfile
local registerfile = resolvers.registerfile
local splitmethod = resolvers.splitmethod
local starttiming = resolvers.starttiming
local stoptiming = resolvers.stoptiming
local urlquery = url.query
--- hm, zip sits in the global namespace, but tar doesn't
local tar = utilities.tar or { }
utilities.tar = tar -- not needed
local archives = tar.archives or { }
tar.archives = archives
local registeredfiles = tar.registeredfiles or { }
tar.registeredfiles = registeredfiles
-- foo.tar.xz : done
-- foo.tar.gz : todo
-- foo.tar : done
local hashtar, fetchtar, wipetar do
local suffix = file.suffix -- hassuffix .. no need to split
local tarfiles = utilities.tar.file
local tarstrings = utilities.tar.string
local hashtarfile = tar.files.hash
local fetchtarfile = tar.files.fetch
local hashtarstring = tar.strings.hash
local fetchtarstring = tar.strings.fetch
local register = resolvers.decompressors.register
hashtar = function(archive,strip)
local a = register(archive)
if a then
return hashtarstring(a,archive)
else
return hashtarfile(archive,archive)
end
end
fetchtar = function(archive,filename,list)
local a = register(archive)
if a then
return fetchtarstring(a,filename,list)
else
return fetchtarfile(archive,filename,list)
end
end
wipetar = resolvers.decompressors.unregister
end
local function validfile(archive,name)
return archive[name]
end
local function openarchive(name)
if not name or name == "" then
return nil
else
local arch = archives[name]
if not arch then
local full = findfile(name) or ""
arch = full ~= "" and hashtar(full,name) or false
archives[name] = arch
end
return arch
end
end
local function closearchive(name)
if not name or (name == "" and archives[name]) then
archives[name] = nil
wipetar(name)
end
end
tar.openarchive = openarchive
tar.closearchive = closearchive
function resolvers.locators.tar(specification)
local archive = specification.filename
local tarfile = archive and archive ~= "" and openarchive(archive)
if trace_locating then
if tarfile then
report_tar("locator: archive %a found",archive)
else
report_tar("locator: archive %a not found",archive)
end
end
end
function resolvers.concatinators.tar(tarfile,path,name) -- ok ?
if not path or path == "" then
return format('%s?name=%s',tarfile,name)
else
return format('%s?name=%s/%s',tarfile,path,name)
end
end
local finders = resolvers.finders
local notfound = finders.notfound
function finders.tar(specification)
local original = specification.original
local archive = specification.filename
if archive then
local query = urlquery(specification.query)
local queryname = query.name
if queryname then
local tfile = openarchive(archive)
if tfile then
if trace_locating then
report_tar("finder: archive %a found",archive)
end
if validfile(tfile,queryname) then
if trace_locating then
report_tar("finder: file %a found",queryname)
end
return specification.original
elseif trace_locating then
report_tar("finder: file %a not found",queryname)
end
elseif trace_locating then
report_tar("finder: unknown archive %a",archive)
end
end
end
if trace_locating then
report_tar("finder: %a not found",original)
end
return notfound()
end
local openers = resolvers.openers
local notfound = openers.notfound
local textopener = openers.helpers.textopener
function openers.tar(specification)
local original = specification.original
local archive = specification.filename
if archive then
local query = urlquery(specification.query)
local queryname = query.name
if queryname then
local tfile = openarchive(archive)
if tfile then
if trace_locating then
report_tar("opener; archive %a opened",archive)
end
local data = fetchtar(archive,queryname,tfile)
if data then
if trace_locating then
report_tar("opener: file %a found",queryname)
end
return textopener('tar',original,data) -- a string handle
elseif trace_locating then
report_tar("opener: file %a not found",queryname)
end
elseif trace_locating then
report_tar("opener: unknown archive %a",archive)
end
end
end
if trace_locating then
report_tar("opener: %a not found",original)
end
return notfound()
end
loaders = resolvers.loaders
local notfound = loaders.notfound
function loaders.tar(specification)
local original = specification.original
local archive = specification.filename
if archive then
local query = urlquery(specification.query)
local queryname = query.name
if queryname then
local tfile = openarchive(archive)
if tfile then
if trace_locating then
report_tar("loader: archive %a opened",archive)
end
local data = fetchtar(archive,queryname,tfile)
if data then
if trace_locating then
report_tar("loader; file %a loaded",original)
end
return true, data, #data
elseif trace_locating then
report_tar("loader: file %a not found",queryname)
end
elseif trace_locating then
report_tar("loader; unknown archive %a",archive)
end
end
end
if trace_locating then
report_tar("loader: %a not found",original)
end
return notfound()
end
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