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if not modules then modules = { } end modules ['node-seq'] = {
version = 1.001,
comment = "companion to node-ini.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- we assume namespace usage, i.e. unique names for functions
local format, concat = string.format, table.concat
sequencer = sequencer or { }
function sequencer.reset()
return {
list = { },
order = { },
kind = { },
}
end
function sequencer.prependgroup(t,group,where)
local list, order = t.list, t.order
table.remove_value(order,group)
table.insert_before_value(order,where,group)
list[group] = { }
end
function sequencer.appendgroup(t,group,where)
local list, order = t.list, t.order
table.remove_value(order,group)
table.insert_after_value(order,where,group)
list[group] = { }
end
function sequencer.prependaction(t,group,action,where,kind)
local g = t.list[group]
if g then
table.remove_value(g,action)
table.insert_before_value(g,where,action)
t.kind[action] = kind
end
end
function sequencer.appendaction(t,group,action,where,kind)
local g = t.list[group]
if g then
table.remove_value(g,action)
table.insert_after_value(g,where,action)
t.kind[action] = kind
end
end
function sequencer.setkind(t,action,kind)
t.kind[action] = kind
end
function sequencer.removeaction(t,group,action)
local g = t.list[group]
if g then
table.remove_value(g,action)
end
end
function sequencer.compile(t,compiler)
if type(t) == "string" then
-- already compiled
elseif compiler then
t = compiler(t)
else
t = sequencer.tostring(t)
end
return loadstring(t)()
end
local function localize(str)
return str:gsub("%.","_")
end
local template = [[
%s
return function(...)
%s
end]]
function sequencer.tostring(t)
local list, order, kind, vars, calls = t.list, t.order, t.kind, { }, { }
for i=1,#order do
local group = order[i]
local actions = list[group]
for i=1,#actions do
local action = actions[i]
local localized = localize(action)
vars [#vars +1] = format("local %s = %s", localized, action)
calls[#calls+1] = format(" %s(...) -- %s %i", localized, group, i)
end
end
return template:format(concat(vars,"\n"),concat(calls,"\n"))
end
local template = [[
%s
return function(head,tail)
local ok, done = false, false
%s
return head, tail, done
end]]
function sequencer.nodeprocessor(t)
local list, order, kind, vars, calls = t.list, t.order, t.kind, { }, { }
for i=1,#order do
local group = order[i]
local actions = list[group]
for i=1,#actions do
local action = actions[i]
local localized = localize(action)
vars[#vars+1] = format("local %s = %s",localized,action)
if kind[action] == "nohead" then
calls[#calls+1] = format(" ok = %s(head,tail) done = done or ok -- %s %i",localized,group,i)
elseif kind[action] == "notail" then
calls[#calls+1] = format(" head, ok = %s(head,tail) done = done or ok -- %s %i",localized,group,i)
else
calls[#calls+1] = format(" head, tail, ok = %s(head,tail) done = done or ok -- %s %i",localized,group,i)
end
end
end
return template:format(concat(vars,"\n"),concat(calls,"\n"))
end
--~ hans = {}
--~ taco = {}
--~ function hans.a(head,tail) print("a",head,tail) return head,tail,true end
--~ function hans.b(head,tail) print("b",head,tail) return head,tail,true end
--~ function hans.c(head,tail) print("c",head,tail) return head,tail,true end
--~ function hans.x(head,tail) print("x",head,tail) return head,tail,true end
--~ function taco.i(head,tail) print("i",head,tail) return head,tail,true end
--~ function taco.j(head,tail) print("j",head,tail) return head,tail,true end
--~ t = sequencer.reset()
--~ sequencer.appendgroup(t,"hans")
--~ sequencer.appendgroup(t,"taco")
--~ sequencer.prependaction(t,"hans","hans.a")
--~ sequencer.appendaction (t,"hans","hans.b")
--~ sequencer.appendaction (t,"hans","hans.x")
--~ sequencer.prependaction(t,"hans","hans.c","hans.b")
--~ sequencer.prependaction(t,"taco","taco.i")
--~ sequencer.prependaction(t,"taco","taco.j")
--~ sequencer.removeaction(t,"hans","hans.x")
--~ sequencer.setkind(t,"hans.b","notail")
--~ sequencer.setkind(t,"taco.j","nohead")
--~ print(sequencer.tostring(t))
--~ s = sequencer.compile(t,sequencer.nodeprocessor)
--~ print(sequencer.nodeprocessor(t))
--~ print(s("head","tail"))
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