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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
context = context or { }
local format, concat = string.format, table.concat
local next, type = next, type
local texsprint, texiowrite, ctxcatcodes = tex.sprint, texio.write, tex.ctxcatcodes
local flush = texsprint or function(cct,...) print(table.concat{...}) end
local _stack_, _n_ = { }, 0
local function _store_(ti)
_n_ = _n_ + 1
_stack_[_n_] = ti
return _n_
end
local function _flush_(n)
if not _stack_[n]() then
_stack_[n] = nil
else
-- keep, beware, that way the stack can grow
end
end
context._stack_ = _stack_
context._store_ = _store_
context._flush_ = _flush_
function tex.fprint(...) -- goodie
texsprint(ctxcatcodes,format(...))
end
function context.trace(intercept)
local normalflush = flush
flush = function(c,...)
trace_context(concat({...}))
if not intercept then
normalflush(c,...)
end
end
context.trace = function() end
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)
local trace_context = logs.new("context")
local function writer(k,...)
if k then
flush(ctxcatcodes,k)
local t = { ... }
local nt = #t
if nt > 0 then
for i=1,nt do
local ti = t[i]
local typ = type(ti)
if ti == nil then
-- next
elseif typ == "function" then
flush(ctxcatcodes,"{\\mkivflush{" .. _store_(ti) .. "}}")
elseif typ == "string" or typ == "number" then
flush(ctxcatcodes,"{",ti,"}")
elseif typ == "table" then
local tn = #ti
if tn > 0 then
for j=1,tn do
local tj = ti[j]
if type(tj) == "function" then
ti[j] = "\\mkivflush{" .. _store_(tj) .. "}"
end
end
flush(ctxcatcodes,"[",concat(ti,","),"]")
else
flush(ctxcatcodes,"[")
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
flush(ctxcatcodes,"]")
end
-- 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
elseif typ == "thread" then
trace_context("coroutines not supported as we cannot yeild across boundaries")
else
trace_context("error: %s gets a weird argument %s",k,tostring(ti))
end
end
end
end
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 a then
flush(ctxcatcodes,format(f,a,...))
elseif type(f) == "function" then
flush(ctxcatcodes,"{\\mkivflush{" .. _store_(f) .. "}}")
elseif f then
flush(ctxcatcodes,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 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)
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