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|
if not modules then modules = { } end modules ['cldf-ini'] = {
version = 1.001,
comment = "companion to cldf-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This started as 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.
--
-- maybe optional checking against interface
-- currently no coroutine trickery
-- we could always use prtcatcodes (context.a_b_c) but then we loose protection
-- tflush needs checking ... sort of weird that it's not a table
-- __flushlines is an experiment and rather ugly so it will go away
--
-- tex.print == line with endlinechar appended
local tex = tex
context = context or { }
local context = context
local format, find, gmatch, gsub = string.format, string.find, string.gmatch, string.gsub
local next, type, tostring, tonumber, setmetatable = next, type, tostring, tonumber, setmetatable
local insert, remove, concat = table.insert, table.remove, table.concat
local lpegmatch, lpegC, lpegS, lpegP, lpegCc = lpeg.match, lpeg.C, lpeg.S, lpeg.P, lpeg.Cc
local texsprint = tex.sprint
local textprint = tex.tprint
local texprint = tex.print
local texwrite = tex.write
local texcount = tex.count
local isnode = node.is_node -- after 0.65 just node.type
local writenode = node.write
local copynodelist = node.copy_list
local ctxcatcodes = tex.ctxcatcodes
local prtcatcodes = tex.prtcatcodes
local texcatcodes = tex.texcatcodes
local txtcatcodes = tex.txtcatcodes
local vrbcatcodes = tex.vrbcatcodes
local xmlcatcodes = tex.xmlcatcodes
local flush = texsprint
local flushdirect = texprint
local flushraw = texwrite
local report_context = logs.reporter("cld","tex")
local report_cld = logs.reporter("cld","stack")
local processlines = true -- experiments.register("context.processlines", function(v) processlines = v end)
-- for tracing it's easier to have two stacks
local _stack_f_, _n_f_ = { }, 0
local _stack_n_, _n_n_ = { }, 0
local function _store_f_(ti)
_n_f_ = _n_f_ + 1
_stack_f_[_n_f_] = ti
return _n_f_
end
local function _store_n_(ti)
_n_n_ = _n_n_ + 1
_stack_n_[_n_n_] = ti
return _n_n_
end
local function _flush_f_(n)
local sn = _stack_f_[n]
if not sn then
report_cld("data with id %s cannot be found on stack",n)
else
local tn = type(sn)
if tn == "function" then
if not sn() and texcount["@@trialtypesetting"] == 0 then -- @@trialtypesetting is private!
_stack_f_[n] = nil
else
-- keep, beware, that way the stack can grow
end
else
if texcount["@@trialtypesetting"] == 0 then -- @@trialtypesetting is private!
writenode(sn)
_stack_f_[n] = nil
else
writenode(copynodelist(sn))
-- keep, beware, that way the stack can grow
end
end
end
end
local function _flush_n_(n)
local sn = _stack_n_[n]
if not sn then
report_cld("data with id %s cannot be found on stack",n)
elseif texcount["@@trialtypesetting"] == 0 then -- @@trialtypesetting is private!
writenode(sn)
_stack_n_[n] = nil
else
writenode(copynodelist(sn))
-- keep, beware, that way the stack can grow
end
end
function context.restart()
_stack_f_, _n_f_ = { }, 0
_stack_n_, _n_n_ = { }, 0
end
context._stack_f_ = _stack_f_
context._store_f_ = _store_f_
context._flush_f_ = _flush_f_ _cldf_ = _flush_f_
context._stack_n_ = _stack_n_
context._store_n_ = _store_n_
context._flush_n_ = _flush_n_ _cldn_ = _flush_n_
-- Should we keep the catcodes with the function?
local catcodestack = { }
local currentcatcodes = ctxcatcodes
local contentcatcodes = ctxcatcodes
local catcodes = {
ctx = ctxcatcodes, ctxcatcodes = ctxcatcodes, context = ctxcatcodes,
prt = prtcatcodes, prtcatcodes = prtcatcodes, protect = prtcatcodes,
tex = texcatcodes, texcatcodes = texcatcodes, plain = texcatcodes,
txt = txtcatcodes, txtcatcodes = txtcatcodes, text = txtcatcodes,
vrb = vrbcatcodes, vrbcatcodes = vrbcatcodes, verbatim = vrbcatcodes,
xml = xmlcatcodes, xmlcatcodes = xmlcatcodes,
}
local function pushcatcodes(c)
insert(catcodestack,currentcatcodes)
currentcatcodes = (c and catcodes[c] or tonumber(c)) or currentcatcodes
contentcatcodes = currentcatcodes
end
local function popcatcodes()
currentcatcodes = remove(catcodestack) or currentcatcodes
contentcatcodes = currentcatcodes
end
context.pushcatcodes = pushcatcodes
context.popcatcodes = popcatcodes
-- -- --
--~ local capture = (
--~ space^0 * newline^2 * lpeg.Cc("") / texprint +
--~ space^0 * newline * space^0 * lpeg.Cc(" ") / texsprint +
--~ content / texsprint
--~ )^0
local newline = lpeg.patterns.newline
local space = lpeg.patterns.spacer
local spacing = newline * space^0
local content = lpegC((1-spacing)^1) -- texsprint
local emptyline = space^0 * newline^2 -- texprint("")
local endofline = space^0 * newline * space^0 -- texsprint(" ")
local simpleline = endofline * lpegP(-1) --
local verbose = lpegC((1-space-newline)^1)
local beginstripper = (lpegS(" \t")^1 * newline^1) / ""
local endstripper = beginstripper * lpegP(-1)
local justaspace = space * lpegCc("")
local justanewline = newline * lpegCc("")
local function n_content(s)
flush(contentcatcodes,s)
end
local function n_verbose(s)
flush(vrbcatcodes,s)
end
local function n_endofline()
flush(currentcatcodes," \r")
end
local function n_emptyline()
flushdirect(currentcatcodes,"\r")
end
local function n_simpleline()
flush(currentcatcodes," \r")
end
local n_exception = ""
-- better a table specification
function context.newtexthandler(specification) -- can also be used for verbose
specification = specification or { }
--
local s_catcodes = specification.catcodes
--
local f_before = specification.before
local f_after = specification.after
--
local f_endofline = specification.endofline or n_endofline
local f_emptyline = specification.emptyline or n_emptyline
local f_simpleline = specification.simpleline or n_simpleline
local f_content = specification.content or n_content
local f_space = specification.space
--
local p_exception = specification.exception
--
if s_catcodes then
f_content = function(s)
flush(s_catcodes,s)
end
end
--
local pattern
if f_space then
if p_exception then
local content = lpegC((1-spacing-p_exception)^1)
pattern =
(
justaspace / f_space
+ justanewline / f_endofline
+ p_exception
+ content / f_content
)^0
else
local content = lpegC((1-space-endofline)^1)
pattern =
(
justaspace / f_space
+ justanewline / f_endofline
+ content / f_content
)^0
end
else
if p_exception then
local content = lpegC((1-spacing-p_exception)^1)
pattern =
simpleline / f_simpleline
+
(
emptyline / f_emptyline
+ endofline / f_endofline
+ p_exception
+ content / f_content
)^0
else
local content = lpegC((1-spacing)^1)
pattern =
simpleline / f_simpleline
+
(
emptyline / f_emptyline
+ endofline / f_endofline
+ content / f_content
)^0
end
end
--
if f_before then
pattern = (P(true) / f_before) * pattern
end
--
if f_after then
pattern = pattern * (P(true) / f_after)
end
--
return function(str) return lpegmatch(pattern,str) end, pattern
end
function context.newverbosehandler(specification) -- a special variant for e.g. cdata in lxml-tex
specification = specification or { }
--
local f_line = specification.line or function() flushdirect("\r") end
local f_space = specification.space or function() flush(" ") end
local f_content = specification.content or n_verbose
local f_before = specification.before
local f_after = specification.after
--
local pattern =
justanewline / f_line -- so we get call{}
+ verbose / f_content
+ justaspace / f_space -- so we get call{}
--
if specification.strip then
pattern = beginstripper^0 * (endstripper + pattern)^0
else
pattern = pattern^0
end
--
if f_before then
pattern = (lpegP(true) / f_before) * pattern
end
--
if f_after then
pattern = pattern * (lpegP(true) / f_after)
end
--
return function(str) return lpegmatch(pattern,str) end, pattern
end
local flushlines = context.newtexthandler {
content = n_content,
endofline = n_endofline,
emptyline = n_emptyline,
simpleline = n_simpleline,
}
context.__flushlines = flushlines -- maybe context.helpers.flushtexlines
context.__flush = flush
context.__flushdirect = flushdirect
-- The next variant is only used in rare cases (buffer to mp):
local printlines_ctx = (
(newline) / function() texprint("") end +
(1-newline)^1 / function(s) texprint(ctxcatcodes,s) end * newline^-1
)^0
local printlines_raw = (
(newline) / function() texprint("") end +
(1-newline)^1 / function(s) texprint(s) end * newline^-1
)^0
function context.printlines(str,raw) -- todo: see if via file is useable
if raw then
lpegmatch(printlines_raw,str)
else
lpegmatch(printlines_ctx,str)
end
end
-- This is the most reliable way to deal with nested buffers and other
-- catcode sensitive data.
local methodhandler = resolvers.methodhandler
function context.viafile(data)
if data and data ~= "" then
local filename = resolvers.savers.byscheme("virtual","viafile",data)
-- context.startregime { "utf" }
context.input(filename)
-- context.stopregime()
end
end
-- -- --
local function writer(parent,command,first,...) -- already optimized before call
local t = { first, ... }
flush(currentcatcodes,command) -- todo: ctx|prt|texcatcodes
local direct = false
for i=1,#t do
local ti = t[i]
local typ = type(ti)
if direct then
if typ == "string" or typ == "number" then
flush(currentcatcodes,ti)
else -- node.write
report_context("error: invalid use of direct in '%s', only strings and numbers can be flushed directly, not '%s'",command,typ)
end
direct = false
elseif ti == nil then
-- nothing
elseif ti == "" then
flush(currentcatcodes,"{}")
elseif typ == "string" then
-- is processelines seen ?
if processlines and find(ti,"[\n\r]") then -- we can check for ti == "\n"
flush(currentcatcodes,"{")
local flushlines = parent.__flushlines or flushlines
flushlines(ti)
flush(currentcatcodes,"}")
elseif currentcatcodes == contentcatcodes then
flush(currentcatcodes,"{",ti,"}")
else
flush(currentcatcodes,"{")
flush(contentcatcodes,ti)
flush(currentcatcodes,"}")
end
elseif typ == "number" then
-- numbers never have funny catcodes
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,"[\\cldf{",_store_f_(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] = "\\cldf{" .. _store_f_(tj) .. "}"
end
end
flush(currentcatcodes,"[",concat(ti,","),"]")
end
elseif typ == "function" then
flush(currentcatcodes,"{\\cldf{",_store_f_(ti),"}}") -- todo: ctx|prt|texcatcodes
elseif typ == "boolean" then
if ti then
flushdirect(currentcatcodes,"\r")
else
direct = true
end
elseif typ == "thread" then
report_context("coroutines not supported as we cannot yield across boundaries")
elseif isnode(ti) then -- slow
flush(currentcatcodes,"{\\cldn{",_store_n_(ti),"}}")
else
report_context("error: '%s' gets a weird argument '%s'",command,tostring(ti))
end
end
end
local generics = { } context.generics = generics
local function indexer(parent,k)
local c = "\\" .. tostring(generics[k] or k)
local f = function(first,...)
if first == nil then
flush(currentcatcodes,c)
else
return writer(parent,c,first,...)
end
end
parent[k] = f
return f
end
-- Potential optimization: after the first call we know if there will be an
-- argument. Of course there is the side effect that for instance abuse like
-- context.NC(str) fails as well as optional arguments. So, we don't do this
-- in practice. We just keep the next trick commented. The gain on some
-- 100000 calls is not that large: 0.100 => 0.95 which is neglectable.
--
-- local function constructor(parent,k,c,first,...)
-- if first == nil then
-- local f = function()
-- flush(currentcatcodes,c)
-- end
-- parent[k] = f
-- return f()
-- else
-- local f = function(...)
-- return writer(parent,c,...)
-- end
-- parent[k] = f
-- return f(first,...)
-- end
-- end
--
-- local function indexer(parent,k)
-- local c = "\\" .. tostring(generics[k] or k)
-- local f = function(...)
-- return constructor(parent,k,c,...)
-- end
-- parent[k] = f
-- return f
-- end
-- only for internal usage:
function context.constructcsonly(k) -- not much faster than the next but more mem efficient
local c = "\\" .. tostring(generics[k] or k)
rawset(context, k, function()
flush(prtcatcodes,c)
end)
end
function context.constructcs(k)
local c = "\\" .. tostring(generics[k] or k)
rawset(context, k, function(first,...)
if first == nil then
flush(prtcatcodes,c)
else
return writer(context,c,first,...)
end
end)
end
local function caller(parent,f,a,...)
if not parent then
-- so we don't need to test in the calling (slower but often no issue)
elseif f ~= nil then
local typ = type(f)
if typ == "string" then
if a then
flush(contentcatcodes,format(f,a,...)) -- was currentcatcodes
elseif processlines and find(f,"[\n\r]") then
local flushlines = parent.__flushlines or flushlines
flushlines(f)
else
flush(contentcatcodes,f)
end
elseif typ == "number" then
if a then
flush(currentcatcodes,f,a,...)
else
flush(currentcatcodes,f)
end
elseif typ == "function" then
-- ignored: a ...
flush(currentcatcodes,"{\\cldf{",_store_f_(f),"}}") -- todo: ctx|prt|texcatcodes
elseif typ == "boolean" then
if f then
if a ~= nil then
local flushlines = parent.__flushlines or flushlines
flushlines(f)
-- ignore ... maybe some day
else
flushdirect(currentcatcodes,"\r")
end
else
if a ~= nil then
-- no command, same as context(a,...)
writer(parent,"",a,...)
else
-- ignored
end
end
elseif typ == "thread" then
report_context("coroutines not supported as we cannot yield across boundaries")
elseif isnode(f) then -- slow
-- writenode(f)
flush(currentcatcodes,"\\cldn{",_store_n_(f),"}")
else
report_context("error: 'context' gets a weird argument '%s'",tostring(f))
end
end
end
local defaultcaller = caller
setmetatable(context, { __index = indexer, __call = caller } )
-- now we tweak unprotect and protect
function context.unprotect()
-- at the lua end
insert(catcodestack,currentcatcodes)
currentcatcodes = prtcatcodes
contentcatcodes = currentcatcodes
-- at the tex end
flush("\\unprotect")
end
function context.protect()
-- at the tex end
flush("\\protect")
-- at the lua end
currentcatcodes = remove(catcodestack) or currentcatcodes
contentcatcodes = currentcatcodes
end
function context.sprint(...) -- takes catcodes as first argument
flush(...)
end
function context.fprint(catcodes,fmt,first,...)
if type(catcodes) == "number" then
if first then
flush(catcodes,format(fmt,first,...))
else
flush(catcodes,fmt)
end
else
if fmt then
flush(format(catodes,fmt,first,...))
else
flush(catcodes)
end
end
end
function tex.fprint(fmt,first,...) -- goodie
if first then
flush(currentcatcodes,format(fmt,first,...))
else
flush(currentcatcodes,fmt)
end
end
-- logging
local trace_stack = { }
local normalflush = flush
local normalflushdirect = flushdirect
local normalflushraw = flushraw
local normalwriter = writer
local currenttrace = nil
local nofwriters = 0
local nofflushes = 0
statistics.register("traced context", function()
if nofwriters > 0 or nofflushes > 0 then
return format("writers: %s, flushes: %s, maxstack: %s",nofwriters,nofflushes,_n_f_)
end
end)
local tracedwriter = function(parent,...) -- also catcodes ?
nofwriters = nofwriters + 1
local savedflush = flush
local savedflushdirect = flushdirect -- unlikely to be used here
local t, n = { "w : - : " }, 1
local traced = function(normal,catcodes,...) -- todo: check for catcodes
local s = concat({...})
s = gsub(s,"\r","<<newline>>") -- unlikely
n = n + 1
t[n] = s
normal(catcodes,...)
end
flush = function(...) traced(normalflush, ...) end
flushdirect = function(...) traced(normalflushdirect,...) end
normalwriter(parent,...)
flush = savedflush
flushdirect = savedflushdirect
currenttrace(concat(t))
end
-- we could reuse collapsed
local traced = function(normal,one,two,...)
nofflushes = nofflushes + 1
if two then
-- only catcodes if 'one' is number
normal(one,two,...)
local catcodes = type(one) == "number" and one
local arguments = catcodes and { two, ... } or { one, two, ... }
local collapsed, c = { format("f : %s : ", catcodes or '-') }, 1
for i=1,#arguments do
local argument = arguments[i]
local argtype = type(argument)
c = c + 1
if argtype == "string" then
collapsed[c] = gsub(argument,"\r","<<newline>>")
elseif argtype == "number" then
collapsed[c] = argument
else
collapsed[c] = format("<<%s>>",tostring(argument))
end
end
currenttrace(concat(collapsed))
else
-- no catcodes
normal(one)
local argtype = type(one)
if argtype == "string" then
currenttrace(format("f : - : %s",gsub(one,"\r","<<newline>>")))
elseif argtype == "number" then
currenttrace(format("f : - : %s",one))
else
currenttrace(format("f : - : <<%s>>",tostring(one)))
end
end
end
local tracedflush = function(...) traced(normalflush, ...) end
local tracedflushdirect = function(...) traced(normalflushdirect,...) end
local function pushlogger(trace)
trace = trace or report_context
insert(trace_stack,currenttrace)
currenttrace = trace
--
flush = tracedflush
flushdirect = tracedflushdirect
writer = tracedwriter
--
context.__flush = flush
context.__flushdirect = flushdirect
--
return flush, writer, flushdirect
end
local function poplogger()
currenttrace = remove(trace_stack)
if not currenttrace then
flush = normalflush
flushdirect = normalflushdirect
writer = normalwriter
--
context.__flush = flush
context.__flushdirect = flushdirect
end
return flush, writer, flushdirect
end
local function settracing(v)
if v then
return pushlogger(report_context)
else
return poplogger()
end
end
-- todo: share flushers so that we can define in other files
trackers.register("context.trace",settracing)
context.pushlogger = pushlogger
context.poplogger = poplogger
context.settracing = settracing
-- -- untested, no time now:
--
-- local tracestack, tracestacktop = { }, false
--
-- function context.pushtracing(v)
-- insert(tracestack,tracestacktop)
-- if type(v) == "function" then
-- pushlogger(v)
-- v = true
-- else
-- pushlogger()
-- end
-- tracestacktop = v
-- settracing(v)
-- end
--
-- function context.poptracing()
-- poplogger()
-- tracestacktop = remove(tracestack) or false
-- settracing(tracestacktop)
-- end
function context.getlogger()
return flush, writer, flush_direct
end
local trace_cld = false trackers.register("context.files", function(v) trace_cld = v end)
function context.runfile(filename)
local foundname = resolvers.findtexfile(file.addsuffix(filename,"cld")) or ""
if foundname ~= "" then
local ok = dofile(foundname)
if type(ok) == "function" then
if trace_cld then
report_context("begin of file '%s' (function call)",foundname)
end
ok()
if trace_cld then
report_context("end of file '%s' (function call)",foundname)
end
elseif ok then
report_context("file '%s' is processed and returns true",foundname)
else
report_context("file '%s' is processed and returns nothing",foundname)
end
else
report_context("unknown file '%s'",filename)
end
end
-- some functions
function context.direct(first,...)
if first ~= nil then
return writer(context,"",first,...)
end
end
-- context.delayed (todo: lines)
local delayed = { } context.delayed = delayed -- maybe also store them
local function indexer(parent,k)
local f = function(...)
local a = { ... }
return function()
return context[k](unpack(a))
end
end
parent[k] = f
return f
end
local function caller(parent,...) -- todo: nodes
local a = { ... }
return function()
return context(unpack(a))
end
end
setmetatable(delayed, { __index = indexer, __call = caller } )
-- context.nested (todo: lines)
local nested = { } context.nested = nested
local function indexer(parent,k)
local f = function(...)
local t, savedflush, n = { }, flush, 0
flush = function(c,f,s,...) -- catcodes are ignored
n = n + 1
t[n] = s and concat{f,s,...} or f -- optimized for #args == 1
end
context[k](...)
flush = savedflush
return concat(t)
end
parent[k] = f
return f
end
local function caller(parent,...)
local t, savedflush, n = { }, flush, 0
flush = function(c,f,s,...) -- catcodes are ignored
n = n + 1
t[n] = s and concat{f,s,...} or f -- optimized for #args == 1
end
context(...)
flush = savedflush
return concat(t)
end
setmetatable(nested, { __index = indexer, __call = caller } )
-- verbatim
local verbatim = { } context.verbatim = verbatim
local function indexer(parent,k)
local command = context[k]
local f = function(...)
local savedcatcodes = contentcatcodes
contentcatcodes = vrbcatcodes
command(...)
contentcatcodes = savedcatcodes
end
parent[k] = f
return f
end
local function caller(parent,...)
local savedcatcodes = contentcatcodes
contentcatcodes = vrbcatcodes
defaultcaller(parent,...)
contentcatcodes = savedcatcodes
end
setmetatable(verbatim, { __index = indexer, __call = caller } )
-- metafun (this will move to another file)
local metafun = { } context.metafun = metafun
local mpdrawing = "\\MPdrawing"
local function caller(parent,f,a,...)
if not parent then
-- skip
elseif f then
local typ = type(f)
if typ == "string" then
if a then
flush(currentcatcodes,mpdrawing,"{",format(f,a,...),"}")
else
flush(currentcatcodes,mpdrawing,"{",f,"}")
end
elseif typ == "number" then
if a then
flush(currentcatcodes,mpdrawing,"{",f,a,...,"}")
else
flush(currentcatcodes,mpdrawing,"{",f,"}")
end
elseif typ == "function" then
-- ignored: a ...
flush(currentcatcodes,mpdrawing,"{\\cldf{",store_(f),"}}")
elseif typ == "boolean" then
-- ignored: a ...
if f then
flush(currentcatcodes,mpdrawing,"{^^M}")
else
report_context("warning: 'metafun' gets argument 'false' which is currently unsupported")
end
else
report_context("error: 'metafun' gets a weird argument '%s'",tostring(f))
end
end
end
setmetatable(metafun, { __call = caller } )
function metafun.start()
context.resetMPdrawing()
end
function metafun.stop()
context.MPdrawingdonetrue()
context.getMPdrawing()
end
function metafun.color(name)
return format([[\MPcolor{%s}]],name)
end
-- metafun.delayed
local delayed = { } metafun.delayed = delayed
local function indexer(parent,k)
local f = function(...)
local a = { ... }
return function()
return metafun[k](unpack(a))
end
end
parent[k] = f
return f
end
local function caller(parent,...)
local a = { ... }
return function()
return metafun(unpack(a))
end
end
setmetatable(delayed, { __index = indexer, __call = caller } )
-- helpers:
-- we could have faster calls here
function context.concat(t,separator)
local done = false
for i=1,#t do
local ti = t[i]
if ti ~= "" then
if done then
context(separator)
end
context(ti)
done = true
end
end
end
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