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if not modules then modules = { } end modules ['data-tex'] = {
version = 1.001,
comment = "companion to luat-lib.tex",
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 trace_locating = false trackers.register("resolvers.locating", function(v) trace_locating = v end)
local texiowrite_nl = (texio and texio.write_nl) or print
local texiowrite = (texio and texio.write) or print
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
logs.report("fileio",'+ finder: %s, file: %s', tag,filename)
end
return foundname
else
if trace_locating then
logs.report("fileio",'- finder: %s, file: %s', tag,filename)
end
return unpack(finders.notfound)
end
end
--~ local getlines = lpeg.Ct(lpeg.linebyline)
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
logs.report("fileio",'+ opener: %s (%s), file: %s',tag,unicode.utfname[u],filename)
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
logs.report("fileio",'= closer: %s (%s), file: %s',tag,unicode.utfname[u],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
logs.report("fileio",'+ opener: %s, file: %s',tag,filename)
end
-- todo: file;name -> freeze / eerste regel scannen -> freeze
--~ local data = getlines:match(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
logs.report("fileio",'= closer: %s, file: %s',tag,filename)
end
logs.show_close(filename)
file_handle:close()
t = nil
collectgarbage("step")
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)
return openers.text_opener(filename,f,tag)
end
end
if trace_locating then
logs.report("fileio",'- opener: %s, file: %s',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
logs.report("fileio",'+ loader: %s, file: %s',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
logs.report("fileio",'- loader: %s, file: %s',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',file.collapse_path(filename), filetype)
end
function resolvers.opentexfile(filename)
return resolvers.methodhandler('openers',file.collapse_path(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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