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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 resolvers = resolvers
local finders, openers, loaders, savers = resolvers.finders, resolvers.openers, resolvers.loaders, resolvers.savers
local checkgarbage = utilities.garbagecollector and utilities.garbagecollector.check
-- the main text reader --
local sequencers = utilities.sequencers
local fileprocessor = nil
local lineprocessor = nil
local textfileactions = sequencers.reset {
arguments = "str,filename",
returnvalues = "str",
results = "str",
}
local textlineactions = sequencers.reset {
arguments = "str,filename,linenumber",
returnvalues = "str",
results = "str",
}
openers.textfileactions = textfileactions
openers.textlineactions = textlineactions
sequencers.appendgroup(textfileactions,"system")
sequencers.appendgroup(textfileactions,"user")
sequencers.appendgroup(textlineactions,"system")
sequencers.appendgroup(textlineactions,"user")
function openers.textopener(tag,filename,file_handle)
if textfileactions.dirty then
fileprocessor = sequencers.compile(textfileactions)
end
local lines
if not file_handle then
lines = io.loaddata(filename)
elseif type(file_handle) == "string" then
lines = file_handle
elseif type(file_handle) == "table" then
lines = file_handle
elseif file_handle then
lines = file_handle:read("*a")
file_handle:close()
end
if type(lines) == "string" then
local kind = unicode.filetype(lines)
if trace_locating then
report_resolvers("%s opener, file '%s' opened using method '%s'",tag,filename,kind)
end
if kind == "utf-16-be" then
lines = unicode.utf16_to_utf8_be(lines)
elseif kind == "utf-16-le" then
lines = unicode.utf16_to_utf8_le(lines)
elseif kind == "utf-32-be" then
lines = unicode.utf32_to_utf8_be(lines)
elseif kind == "utf-32-le" then
lines = unicode.utf32_to_utf8_le(lines)
else -- utf8 or unknown
lines = fileprocessor(lines,filename) or lines
lines = string.splitlines(lines)
end
elseif trace_locating then
report_resolvers("%s opener, file '%s' opened",tag,filename)
end
local t = {
lines = lines,
current = 0,
handle = nil,
noflines = #lines,
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, noflines = self.current, self.noflines
if current >= noflines 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 textlineactions.dirty then
lineprocessor = sequencers.compile(textlineactions)
end
return lineprocessor(line,filename,current) or line
end
end
end
}
return t
end
local data, n, template = { }, 0, "virtual://virtualfile:%s"
-- todo: report statistics
function savers.virtual(content)
n = n + 1
local filename = format(template,n)
if trace_locating then
report_resolvers("%s finder: virtual file '%s' saved",tag,filename)
end
data[filename] = content
return filename
end
function finders.virtual(filename,filetype,specification)
local path = specification and specification.path
local name = path ~= "" and path or filename
local d = data[name]
if d then
if trace_locating then
report_resolvers("virtual finder: file '%s' found",filename)
end
return filename
else
if trace_locating then
report_resolvers("virtual finder: unknown file '%s'",filename)
end
return unpack(finders.notfound)
end
end
function openers.virtual(filename,filetype,specification) -- duplicate ... todo: specification
local path = specification and specification.path
local name = path ~= "" and path or filename
local d = data[name]
if d then
if trace_locating then
report_resolvers("virtual opener, file '%s' opened",filename)
end
data[filename] = nil
return openers.textopener("virtual",filename,d)
else
if trace_locating then
report_resolvers("virtual opener, file '%s' not found",filename)
end
return unpack(openers.notfound)
end
end
function loaders.virtual(filename,filetype,specification)
local path = specification and specification.path
local name = path ~= "" and path or filename
local d = data[name]
if d then
if trace_locating then
report_resolvers("virtual loader, file '%s' loaded",filename)
end
data[filename] = nil
return true, d, #d
end
if trace_locating then
report_resolvers("virtual loader, file '%s' not loaded",filename)
end
return unpack(loaders.notfound)
end
-- could be a finder (beware: the generic finders take a tag!)
function finders.generic(tag,filename,filetype)
local foundname = resolvers.findfile(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
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.textopener(tag,filename,f)
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 checkgarbage then
checkgarbage(#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.loadtexfile(filename, filetype)
-- todo: apply filters
local ok, data, size = resolvers.loadbinfile(filename, filetype)
return data or ""
end
resolvers.texdatablob = resolvers.loadtexfile
-- -- keep this one as reference as it's the first version
--
-- resolvers.filters = resolvers.filters or { }
--
-- local input_translator, utf_translator, user_translator = nil, nil, nil
--
-- function resolvers.filters.install(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.textopener(tag,filename,file_handle)
-- 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
-- local data = file_handle:read("*a")
-- if u > 2 then
-- l = unicode.utf32_to_utf8(data,u==4)
-- elseif u > 1 then
-- l = unicode.utf16_to_utf8(data,u==2)
-- else
-- l = string.splitlines(data)
-- 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, maybe checkgarbage but no #
-- end,
-- handle = function()
-- return file_handle
-- end,
-- noflines = function()
-- t.noflines = io.noflines(file_handle)
-- return t.noflines
-- end
-- }
-- end
-- return t
-- end
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