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if not modules then modules = { } end modules ['data-tex'] = {
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"
}
-- special functions that deal with io
local format, lower = string.format, string.lower
local unpack = unpack or table.unpack
local trace_locating = false trackers.register("resolvers.locating", function(v) trace_locating = v end)
local report_resolvers = logs.new("resolvers")
local finders, openers, loaders = resolvers.finders, resolvers.openers, resolvers.loaders
function finders.generic(tag,filename,filetype)
local foundname = resolvers.find_file(filename,filetype)
if foundname and foundname ~= "" then
if trace_locating then
report_resolvers("%s finder: file '%s' found",tag,filename)
end
return foundname
else
if trace_locating then
report_resolvers("%s finder: unknown file '%s'",tag,filename)
end
return unpack(finders.notfound)
end
end
--~ local lpegmatch = lpeg.match
--~ local getlines = lpeg.Ct(lpeg.patterns.textline)
local input_translator, utf_translator, user_translator = nil, nil, nil
function resolvers.install_text_filter(name,func)
if name == "input" then input_translator = func
elseif name == "utf" then utf_translator = func
elseif name == "user" then user_translator = func end
end
function openers.text_opener(filename,file_handle,tag)
local u = unicode.utftype(file_handle)
local t = { }
if u > 0 then
if trace_locating then
report_resolvers("%s opener, file '%s' opened using method '%s'",tag,filename,unicode.utfname[u])
end
local l
if u > 2 then
l = unicode.utf32_to_utf8(file_handle:read("*a"),u==4)
else
l = unicode.utf16_to_utf8(file_handle:read("*a"),u==2)
end
file_handle:close()
t = {
utftype = u, -- may go away
lines = l,
current = 0, -- line number, not really needed
handle = nil,
noflines = #l,
close = function()
if trace_locating then
report_resolvers("%s closer, file '%s' closed",tag,filename)
end
logs.show_close(filename)
t = nil
end,
reader = function(self)
self = self or t
local current, lines = self.current, self.lines
if current >= #lines then
return nil
else
current = current + 1
self.current = current
local line = lines[current]
if not line then
return nil
elseif line == "" then
return ""
else
if input_translator then
line = input_translator(line)
end
if utf_translator then
line = utf_translator(line)
end
if user_translator then
line = user_translator(line)
end
return line
end
end
end
}
else
if trace_locating then
report_resolvers("%s opener, file '%s' opened",tag,filename)
end
-- todo: file;name -> freeze / eerste regel scannen -> freeze
--~ local data = lpegmatch(getlines,file_handle:read("*a"))
--~ local n = 0
t = {
reader = function() -- self
local line = file_handle:read()
--~ n = n + 1
--~ local line = data[n]
--~ print(line)
if not line then
return nil
elseif line == "" then
return ""
else
if input_translator then
line = input_translator(line)
end
if utf_translator then
line = utf_translator(line)
end
if user_translator then
line = user_translator(line)
end
return line
end
end,
close = function()
if trace_locating then
report_resolvers("%s closer, file '%s' closed",tag,filename)
end
logs.show_close(filename)
file_handle:close()
t = nil
collectgarbage("step") -- saves some memory
end,
handle = function()
return file_handle
end,
noflines = function()
t.noflines = io.noflines(file_handle)
return t.noflines
end
}
end
return t
end
function openers.generic(tag,filename)
if filename and filename ~= "" then
local f = io.open(filename,"r")
if f then
logs.show_open(filename) -- todo
if trace_locating then
report_resolvers("%s opener, file '%s' opened",tag,filename)
end
return openers.text_opener(filename,f,tag)
end
end
if trace_locating then
report_resolvers("%s opener, file '%s' not found",tag,filename)
end
return unpack(openers.notfound)
end
function loaders.generic(tag,filename)
if filename and filename ~= "" then
local f = io.open(filename,"rb")
if f then
logs.show_load(filename)
if trace_locating then
report_resolvers("%s loader, file '%s' loaded",tag,filename)
end
local s = f:read("*a")
if garbagecollector and garbagecollector.check then garbagecollector.check(#s) end
f:close()
if s then
return true, s, #s
end
end
end
if trace_locating then
report_resolvers("%s loader, file '%s' not found",tag,filename)
end
return unpack(loaders.notfound)
end
function finders.tex(filename,filetype)
return finders.generic('tex',filename,filetype)
end
function openers.tex(filename)
return openers.generic('tex',filename)
end
function loaders.tex(filename)
return loaders.generic('tex',filename)
end
function resolvers.findtexfile(filename, filetype)
return resolvers.methodhandler('finders',filename, filetype)
end
function resolvers.opentexfile(filename)
return resolvers.methodhandler('openers',filename)
end
function resolvers.openfile(filename)
local fullname = resolvers.findtexfile(filename)
if fullname and (fullname ~= "") then
return resolvers.opentexfile(fullname)
else
return nil
end
end
function resolvers.texdatablob(filename, filetype)
local ok, data, size = resolvers.loadbinfile(filename, filetype)
return data or ""
end
resolvers.loadtexfile = resolvers.texdatablob
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