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if not modules then modules = { } end modules ['util-seq'] = {
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"
}
--[[ldx--
<p>Here we implement a mechanism for chaining the special functions
that we use in <l n="context"> to deal with mode list processing. We
assume that namespaces for the functions are used, but for speed we
use locals to refer to them when compiling the chain.</p>
--ldx]]--
-- todo: delayed: i.e. we register them in the right order already but delay usage
local format, gsub, concat, gmatch = string.format, string.gsub, table.concat, string.gmatch
local type, loadstring = type, loadstring
utilities = utilities or { }
local tables = utilities.tables
local sequencers = { }
utilities.sequencers = sequencers
local removevalue, insertaftervalue, insertbeforevalue = tables.removevalue, tables.insertaftervalue, tables.insertbeforevalue
local function validaction(action)
local g = _G
for str in gmatch(action,"[^%.]+") do
g = g[str]
if not g then
return false
end
end
return true
end
function sequencers.reset(t)
local s = {
list = { },
order = { },
kind = { },
askip = { },
gskip = { },
}
if t then
s.arguments = t.arguments
s.returnvalues = t.returnvalues
s.results = t.results
end
s.dirty = true
return s
end
function sequencers.prependgroup(t,group,where)
if t then
local list, order = t.list, t.order
removevalue(order,group)
insertbeforevalue(order,where,group)
list[group] = { }
t.dirty = true
end
end
function sequencers.appendgroup(t,group,where)
if t then
local list, order = t.list, t.order
removevalue(order,group)
insertaftervalue(order,where,group)
list[group] = { }
t.dirty = true
end
end
function sequencers.prependaction(t,group,action,where,kind,force)
if t then
local g = t.list[group]
if g and (force or validaction(action)) then
removevalue(g,action)
insertbeforevalue(g,where,action)
t.kind[action] = kind
t.dirty = true
end
end
end
function sequencers.appendaction(t,group,action,where,kind,force)
if t then
local g = t.list[group]
if g and (force or validaction(action)) then
removevalue(g,action)
insertaftervalue(g,where,action)
t.kind[action] = kind
t.dirty = true
end
end
end
function sequencers.enableaction (t,action) if t then t.dirty = true t.askip[action] = false end end
function sequencers.disableaction(t,action) if t then t.dirty = true t.askip[action] = true end end
function sequencers.enablegroup (t,group) if t then t.dirty = true t.gskip[group] = false end end
function sequencers.disablegroup (t,group) if t then t.dirty = true t.gskip[group] = true end end
function sequencers.setkind(t,action,kind)
if t then
t.kind[action] = kind
t.dirty = true
end
end
function sequencers.removeaction(t,group,action,force)
local g = t and t.list[group]
if g and (force or validaction(action)) then
removevalue(g,action)
t.dirty = true
end
end
local function localize(str)
return (gsub(str,"%.","_"))
end
local function construct(t,nodummy)
local list, order, kind, gskip, askip = t.list, t.order, t.kind, t.gskip, t.askip
local arguments, returnvalues, results = t.arguments or "...", t.returnvalues, t.results
local variables, calls, n = { }, { }, 0
for i=1,#order do
local group = order[i]
if not gskip[group] then
local actions = list[group]
for i=1,#actions do
local action = actions[i]
if not askip[action] then
local localized = localize(action)
n = n + 1
variables[n] = format("local %s = %s",localized,action)
if not returnvalues then
calls[n] = format("%s(%s)",localized,arguments)
elseif n == 1 then
calls[n] = format("local %s = %s(%s)",returnvalues,localized,arguments)
else
calls[n] = format("%s = %s(%s)",returnvalues,localized,arguments)
end
end
end
end
end
t.dirty = false
if nodummy and #calls == 0 then
return nil
else
variables = concat(variables,"\n")
calls = concat(calls,"\n")
if results then
return format("%s\nreturn function(%s)\n%s\nreturn %s\nend",variables,arguments,calls,results)
else
return format("%s\nreturn function(%s)\n%s\nend",variables,arguments,calls)
end
end
end
sequencers.tostring = construct
sequencers.localize = localize
function sequencers.compile(t,compiler,n)
if not t or type(t) == "string" then
-- already compiled
elseif compiler then
t = compiler(t,n)
else
t = construct(t)
end
return loadstring(t)()
end
-- we used to deal with tail as well but now that the lists are always
-- double linked and the kernel function no longer expect tail as
-- argument we stick to head and done (done can probably also go
-- as luatex deals with return values efficiently now .. in the
-- past there was some copying involved, but no longer)
local template = [[
%s
return function(head%s)
local ok, done = false, false
%s
return head, done
end]]
function sequencers.nodeprocessor(t,nofarguments) -- todo: handle 'kind' in plug into tostring
local list, order, kind, gskip, askip = t.list, t.order, t.kind, t.gskip, t.askip
local vars, calls, args, n = { }, { }, nil, 0
if nofarguments == 0 then
args = ""
elseif nofarguments == 1 then
args = ",one"
elseif nofarguments == 2 then
args = ",one,two"
elseif nofarguments == 3 then
args = ",one,two,three"
elseif nofarguments == 4 then
args = ",one,two,three,four"
elseif nofarguments == 5 then
args = ",one,two,three,four,five"
else
args = ",..."
end
for i=1,#order do
local group = order[i]
if not gskip[group] then
local actions = list[group]
for i=1,#actions do
local action = actions[i]
if not askip[action] then
local localized = localize(action)
n = n + 1
vars[n] = format("local %s = %s",localized,action)
-- only difference with tostring is kind and rets (why no return)
if kind[action] == "nohead" then
calls[n] = format(" ok = %s(head%s) done = done or ok -- %s %i",localized,args,group,i)
else
calls[n] = format(" head, ok = %s(head%s) done = done or ok -- %s %i",localized,args,group,i)
end
end
end
end
end
local processor = format(template,concat(vars,"\n"),args,concat(calls,"\n"))
-- print(processor)
return processor
end
|
