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if not modules then modules = { } end modules ['mult-cld'] = {
version = 1.001,
comment = "companion to mult-cld.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is an experiment: generating context code at the lua end. After all
-- it is surprisingly simple to implement due to metatables. I was wondering
-- if there was a more natural way to deal with commands at the lua end.
-- Of course it's a bit slower but often more readable when mixed with lua
-- code. It can also be handy when generating documents from databases or
-- when constructing large tables or so.
--
-- Todo: optional checking against interface
-- Todo: coroutine trickery
-- tflush needs checking ... sort of weird that it's not a table
context = context or { }
local context = context
local format, concat = string.format, table.concat
local next, type, tostring = next, type, tostring
local insert, remove = table.insert, table.remove
local tex = tex
local texsprint = tex.sprint
local textprint = tex.tprint
local texprint = tex.print
local texiowrite = texio.write
local texcount = tex.count
local ctxcatcodes = tex.ctxcatcodes
local prtcatcodes = tex.prtcatcodes
local vrbcatcodes = tex.vrbcatcodes
local flush = texsprint
local report_cld = logs.new("cld")
local _stack_, _n_ = { }, 0
local function _store_(ti)
_n_ = _n_ + 1
_stack_[_n_] = ti
return _n_
end
local function _flush_(n)
local sn = _stack_[n]
if not sn then
report_cld("data with id %s cannot be found on stack",n)
elseif not sn() and texcount.trialtypesettingmode == 0 then
_stack_[n] = nil
else
-- keep, beware, that way the stack can grow
end
end
context._stack_ = _stack_
context._store_ = _store_
context._flush_ = _flush_
-- Should we keep the catcodes with the function?
local catcodestack = { }
local currentcatcodes = ctxcatcodes
function context.pushcatcodes(c)
insert(catcodestack,currentcatcodes)
currentcatcodes = c
end
function context.popcatcodes()
currentcatcodes = remove(catcodestack) or currentcatcodes
end
function context.unprotect()
insert(catcodestack,currentcatcodes)
currentcatcodes = prtcatcodes
end
function context.protect()
currentcatcodes = remove(catcodestack) or currentcatcodes
end
function tex.fprint(...) -- goodie
texsprint(currentcatcodes,format(...))
end
--~ function context.direct(...)
--~ context.flush(...)
--~ end
--~ function context.verbose(...)
--~ context.flush(vrbcatcodes,...)
--~ end
local trace_context = logs.new("context") -- here
function context.trace(intercept)
local normalflush = flush
flush = function(...)
trace_context(concat({...},"",2))
if not intercept then
normalflush(...)
end
end
context.trace = function() end
end
function context.getflush()
return flush
end
function context.setflush(newflush)
local oldflush = flush
flush = newflush or flush
return oldflush
end
trackers.register("context.flush", function(v) if v then context.trace() end end)
trackers.register("context.intercept", function(v) if v then context.trace(true) end end)
--~ context.trace()
-- beware, we had command as part of the flush and made it "" afterwards so that we could
-- keep it there (...,command,...) but that really confuses the tex machinery
local function writer(command,first,...) -- 5% faster than just ... and separate flush of command
if not command then
-- error
elseif not first then
flush(currentcatcodes,command)
else
local t = { first, ... }
flush(currentcatcodes,command)
for i=1,#t do
local ti = t[i]
local typ = type(ti)
if ti == nil then
-- nothing
elseif typ == "string" then
if ti == "" then
flush(currentcatcodes,"{}")
else
flush(currentcatcodes,"{",ti,"}")
end
elseif typ == "number" then
flush(currentcatcodes,"{",ti,"}")
elseif typ == "table" then
local tn = #ti
if tn == 0 then
local done = false
for k, v in next, ti do
if done then
if v == "" then
flush(currentcatcodes,",",k,'=')
else
flush(currentcatcodes,",",k,'=',v)
end
else
if v == "" then
flush(currentcatcodes,"[",k,'=')
else
flush(currentcatcodes,"[",k,'=',v)
end
done = true
end
end
flush(currentcatcodes,"]")
elseif tn == 1 then -- some 20% faster than the next loop
local tj = ti[1]
if type(tj) == "function" then
flush(currentcatcodes,"[\\mkivflush{",_store_(tj),"}]")
else
flush(currentcatcodes,"[",tj,"]")
end
else -- is concat really faster than flushes here? probably needed anyway (print artifacts)
for j=1,tn do
local tj = ti[j]
if type(tj) == "function" then
ti[j] = "\\mkivflush{" .. _store_(tj) .. "}"
end
end
flush(currentcatcodes,"[",concat(ti,","),"]")
end
elseif typ == "function" then
flush(currentcatcodes,"{\\mkivflush{",_store_(ti),"}}")
-- elseif typ == "boolean" then
-- flush(currentcatcodes,"\n")
elseif ti == true then
flush(currentcatcodes,"\n")
elseif typ == false then
-- if force == "direct" then
flush(currentcatcodes,tostring(ti))
-- end
elseif typ == "thread" then
trace_context("coroutines not supported as we cannot yield across boundaries")
else
trace_context("error: %s gets a weird argument %s",command,tostring(ti))
end
end
end
end
--~ experiments.register("context.writer",function()
--~ writer = newwriter
--~ end)
local function indexer(t,k)
local c = "\\" .. k .. " "
local f = function(...) return writer(c,...) end
t[k] = f
return f
end
local function caller(t,f,a,...)
if not t then
-- so we don't need to test in the calling (slower but often no issue)
elseif a then
flush(currentcatcodes,format(f,a,...))
elseif type(f) == "function" then
flush(currentcatcodes,"{\\mkivflush{" .. _store_(f) .. "}}")
elseif f then
flush(currentcatcodes,f)
else
flush(currentcatcodes,"\n")
end
end
setmetatable(context, { __index = indexer, __call = caller } )
-- the only non macro:
local trace_cld = false
function context.runfile(filename)
filename = resolvers.findtexfile(filename) or ""
if filename ~= "" then
local ok = dofile(filename)
if type(ok) == "function" then
if trace_cld then
commands.writestatus("cld","begin of file '%s' (function call)",filename)
end
ok()
if trace_cld then
commands.writestatus("cld","end of file '%s' (function call)",filename)
end
elseif ok then
commands.writestatus("cld","file '%s' is processed and returns true",filename)
else
commands.writestatus("cld","file '%s' is processed and returns nothing",filename)
end
else
commands.writestatus("cld","unknown file '%s'",filename)
end
end
-- tracking is using the regular mechanism; we need to define
-- these 'macro' functions explictly as otherwise they are are
-- delayed (as all commands print back to tex, so that tracing
-- would be enabled afterwards)
trackers.register("cld.print", function(v)
trace_cld = v
if v then
flush = function(c,...)
texiowrite(...)
texsprint(c,...)
end
else
flush = texsprint
end
end)
function context.enabletrackers (str) trackers.enable (str) end
function context.disabletrackers(str) trackers.disable(str) end
-- see demo-cld.cld for an example
-- context.starttext(true)
-- context.chapter({ "label" }, "title", true)
-- context.chapter(function() return { "label" } end, "title", true)
--
-- context.startchapter({ title = "test" }, { more = "oeps" }, true)
--
-- context.bTABLE(true)
-- for i=1,10 do
-- context.bTR()
-- for i=1,10 do
-- context.bTD()
-- context("%#2i",math.random(99))
-- context.eTD()
-- end
-- context.eTR(true)
-- end
-- context.eTABLE(true)
--
-- context.stopchapter(true)
--
-- context.stoptext(true)
--~ Not that useful yet. Maybe something like this when the main loop
--~ is a coroutine. It also does not help taking care of nested calls.
--~ Even worse, it interferes with other mechanisms usign context calls.
--~
--~ local create, yield, resume = coroutine.create, coroutine.yield, coroutine.resume
--~ local getflush, setflush = context.getflush, context.setflush
--~ local texsprint, ctxcatcodes = tex.sprint, tex.ctxcatcodes
--~
--~ function context.direct(f)
--~ local routine = create(f)
--~ local oldflush = getflush()
--~ function newflush(...)
--~ oldflush(...)
--~ yield(true)
--~ end
--~ setflush(newflush)
--~
--~ -- local function resumecontext()
--~ -- local done = resume(routine)
--~ -- if not done then
--~ -- return
--~ -- end
--~ -- resumecontext() -- stack overflow ... no tail recursion
--~ -- end
--~ -- context.resume = resumecontext
--~ -- texsprint(ctxcatcodes,"\\ctxlua{context.resume()}")
--~
--~ local function resumecontext()
--~ local done = resume(routine)
--~ if not done then
--~ return
--~ end
--~ -- texsprint(ctxcatcodes,"\\exitloop")
--~ texsprint(ctxcatcodes,"\\ctxlua{context.resume()}") -- can be simple macro call
--~ end
--~ context.resume = resumecontext
--~ -- texsprint(ctxcatcodes,"\\doloop{\\ctxlua{context.resume()}}") -- can be fast loop at the tex end
--~ texsprint(ctxcatcodes,"\\ctxlua{context.resume()}")
--~
--~ end
--~
--~ function something()
--~ context("\\setbox0")
--~ context("\\hbox{hans hagen xx}")
--~ context("\\the\\wd0/\\box0")
--~ end
--~
--~ context.direct(something)
-- this might be generalized: register some primitives as: accepting this or that
-- we can also speed this up
function context.char(k)
if type(k) == "table" then
for i=1,#k do
context(format([[\char%s\relax]],k[i]))
end
elseif k then
context(format([[\char%s\relax]],k))
end
end
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