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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!
context = context or { }
local format, concat = string.format, table.concat
local next, type = next, type
local texsprint, texiowrite = tex.sprint, texio.write
local flush = texsprint
local cache
local function cached_flush(c,...)
local tt = { ... }
for i=1,#tt do
cache[#cache+1] = tt[i]
end
end
local function writer(k,...)
flush(ctxcatcodes,k)
local t = { ... }
if next(t) then
for i=1,#t do
local ti = t[i]
local typ, force = type(ti), nil
while typ == "function" do
local saved_flush = flush
cache = { }
flush = cached_flush
ti, force = ti()
if force then
typ = false -- force special cases
elseif typ == "nil" then
typ = "string"
ti = concat(cache)
elseif typ == "string" then
ti = concat(cache)
end
flush = saved_flush
end
if ti == nil then
-- next
elseif typ == "string" or typ == "number" then
flush(ctxcatcodes,"{",ti,"}")
elseif typ == "table" then
flush(ctxcatcodes,"[")
local c = concat(ti,",")
if c ~= "" then
flush(ctxcatcodes,c)
else
local done = false
for k, v in next, ti do
if done then
flush(ctxcatcodes,",",k,'=',v)
else
flush(ctxcatcodes,k,'=',v)
done = true
end
end
end
flush(ctxcatcodes,"]")
-- elseif typ == "boolean" then
-- flush(ctxcatcodes,"\n")
elseif ti == true then
flush(ctxcatcodes,"\n")
elseif typ == false then
if force == "direct" then
flush(ctxcatcodes,tostring(ti))
end
else
logs.report("interfaces","error: %s gets a weird argument %s",k,tostring(ti))
end
end
end
end
local function indexer(t,k)
local f = function(...) return writer("\\"..k.." ",...) end -- building the cs here saves time
t[k] = f
return f
end
local function caller(t,f,...)
if f then
flush(ctxcatcodes,format(f,...))
else
flush(ctxcatcodes,"\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 ok then
if trace_cld then
commands.writestatus("cld","begin of file '%s'",filename)
end
ok()
if trace_cld then
commands.writestatus("cld","end of file '%s'",filename)
end
else
commands.writestatus("cld","invalid file '%s'",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-lud.lud 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)
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