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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"
}
local tostring, tonumber, type = tostring, tonumber, type
local char, find = string.char, string.find
local trace_locating = false trackers.register("resolvers.locating", function(v) trace_locating = v end)
local report_tex = logs.reporter("resolvers","tex")
local sequencers = utilities.sequencers
local utffiletype = utf.filetype
local setmetatableindex = table.setmetatableindex
local loaddata = io.loaddata
----- readall = io.readall
local resolvers = resolvers
local methodhandler = resolvers.methodhandler
local loadbinfile = resolvers.loadbinfile
local pushinputname = resolvers.pushinputname
local popinputname = resolvers.popinputname
-- local fileprocessor = nil
-- local lineprocessor = nil
local textfileactions = sequencers.new {
arguments = "str,filename,coding",
returnvalues = "str",
results = "str",
}
local textlineactions = sequencers.new {
arguments = "str,filename,linenumber,noflines,coding",
returnvalues = "str",
results = "str",
}
local helpers = resolvers.openers.helpers
local appendgroup = sequencers.appendgroup
local appendaction = sequencers.appendaction
helpers.textfileactions = textfileactions
helpers.textlineactions = textlineactions
appendgroup(textfileactions,"before") -- user
appendgroup(textfileactions,"system") -- private
appendgroup(textfileactions,"after" ) -- user
appendgroup(textlineactions,"before") -- user
appendgroup(textlineactions,"system") -- private
appendgroup(textlineactions,"after" ) -- user
local ctrl_d = char( 4) -- unix
local ctrl_z = char(26) -- windows
----------------------------------------
local lpegmatch = lpeg.match
local newline = lpeg.patterns.newline
local tsplitat = lpeg.tsplitat
local linesplitters = {
tsplitat(newline), -- default since we started
tsplitat(lpeg.S(" ")^0 * newline),
tsplitat(lpeg.S(" \t")^0 * newline),
tsplitat(lpeg.S(" \f\t")^0 * newline), -- saves a bit of space at the cost of runtime
-- tsplitat(lpeg.S(" \v\f\t")^0 * newline),
-- tsplitat(lpeg.R("\0\31")^0 * newline),
}
local linesplitter = linesplitters[1]
directives.register("system.linesplitmethod",function(v)
linesplitter = linesplitters[tonumber(v) or 1] or linesplitters[1]
end)
local function splitlines(str)
return lpegmatch(linesplitter,str)
end
-- not really a bottleneck, but it might become:
--
-- local splitlines = string.splitlines or function(str)
-- return lpegmatch(linesplitter,str)
-- end
--
-- directives.register("system.linesplitmethod",function(v)
-- linesplitter = linesplitters[tonumber(v) or 1] or linesplitters[1]
-- splitlines = function(str)
-- return lpegmatch(linesplitter,str)
-- end
-- end)
-----------------------------------------
local wideutfcoding = {
["utf-16-be"] = utf.utf16_to_utf8_be_t,
["utf-16-le"] = utf.utf16_to_utf8_le_t,
["utf-32-be"] = utf.utf32_to_utf8_be_t,
["utf-32-le"] = utf.utf32_to_utf8_le_t,
}
local function textopener(tag,filename,filehandle,coding)
local lines
local t_filehandle = type(filehandle)
if not filehandle then
lines = loaddata(filename)
elseif t_filehandle == "string" then
lines = filehandle
elseif t_filehandle == "table" then
lines = filehandle
else
lines = filehandle:read("*a") -- readall(filehandle) ... but never that large files anyway
-- lines = readall(filehandle)
filehandle:close()
end
if type(lines) == "string" then
local coding = coding or utffiletype(lines) -- so we can signal no regime
if trace_locating then
report_tex("%a opener: %a opened using method %a",tag,filename,coding)
end
local wideutf = wideutfcoding[coding]
if wideutf then
lines = wideutf(lines)
else -- utf8 or unknown (could be a mkvi file)
local runner = textfileactions.runner
if runner then
lines = runner(lines,filename,coding) or lines
end
lines = splitlines(lines)
end
elseif trace_locating then
report_tex("%a opener: %a opened",tag,filename)
end
local noflines = #lines
if lines[noflines] == "" then -- maybe some special check is needed
lines[noflines] = nil
end
pushinputname(filename)
local currentline, noflines = 0, noflines
local t = {
filename = filename,
noflines = noflines,
-- currentline = 0,
close = function()
local usedname = popinputname() -- should match filename
if trace_locating then
report_tex("%a closer: %a closed",tag,filename)
end
t = nil
end,
reader = function(self)
self = self or t
-- local currentline, noflines = self.currentline, self.noflines
if currentline >= noflines then
return nil
else
currentline = currentline + 1
-- self.currentline = currentline
local content = lines[currentline]
if content == "" then
return ""
-- elseif content == ctrl_d or ctrl_z then
-- return nil -- we need this as \endinput does not work in prints
elseif content then
local runner = textlineactions.runner
if runner then
return runner(content,filename,currentline,noflines,coding) or content
else
return content
end
else
return nil
end
end
end
}
setmetatableindex(t,function(t,k)
if k == "currentline" then
return currentline
else
-- no such key
end
end)
return t
end
helpers.settextopener(textopener) -- can only be done once
function resolvers.findtexfile(filename,filetype)
return methodhandler('finders',filename,filetype)
end
function resolvers.opentexfile(filename)
return methodhandler('openers',filename)
end
function resolvers.openfile(filename)
local fullname = methodhandler('finders',filename)
return fullname and fullname ~= "" and methodhandler('openers',fullname) or nil
end
function resolvers.loadtexfile(filename,filetype)
-- todo: optionally apply filters
local ok, data, size = loadbinfile(filename, filetype)
return data or ""
end
resolvers.texdatablob = resolvers.loadtexfile
local function installhandler(namespace,what,where,func)
if not func then
where, func = "after", where
end
if where == "before" or where == "after" then
appendaction(namespace,where,func)
else
report_tex("installing input %a handlers in %a is not possible",what,tostring(where))
end
end
function resolvers.installinputlinehandler(...) installhandler(textlineactions,"line",...) end
function resolvers.installinputfilehandler(...) installhandler(textfileactions,"file",...) end
-- local basename = file.basename
-- resolvers.installinputlinehandler(function(str,filename,linenumber,noflines)
-- report_tex("[lc] file %a, line %a of %a, length %a",basename(filename),linenumber,noflines,#str)
-- end)
-- resolvers.installinputfilehandler(function(str,filename)
-- report_tex("[fc] file %a, length %a",basename(filename),#str)
-- end)
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