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Diffstat (limited to 'tex/context/base/node-seq.lua')
| -rw-r--r-- | tex/context/base/node-seq.lua | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/tex/context/base/node-seq.lua b/tex/context/base/node-seq.lua new file mode 100644 index 000000000..3a2cf5b6e --- /dev/null +++ b/tex/context/base/node-seq.lua @@ -0,0 +1,186 @@ +if not modules then modules = { } end modules ['node-seq'] = { + version = 1.001, + comment = "companion to node-ini.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 + +sequencer = sequencer or { } + +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 sequencer.reset() + return { + list = { }, + order = { }, + kind = { }, + askip = { }, + gskip = { }, + } +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,force) + local g = t.list[group] + if g and (force or validaction(action)) 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,force) + local g = t.list[group] + if g and (force or validaction(action)) then + table.remove_value(g,action) + table.insert_after_value(g,where,action) + t.kind[action] = kind + end +end + +function sequencer.enableaction (t,action) t.askip[action] = false end +function sequencer.disableaction(t,action) t.askip[action] = true end +function sequencer.enablegroup (t,group) t.gskip[group] = false end +function sequencer.disablegroup (t,group) t.gskip[group] = true end + +function sequencer.setkind(t,action,kind) + t.kind[action] = kind +end + +function sequencer.removeaction(t,group,action,force) + local g = t.list[group] + if g and (force or validaction(action)) then + table.remove_value(g,action) + end +end + +function sequencer.compile(t,compiler,n) + if type(t) == "string" then + -- already compiled + elseif compiler then + t = compiler(t,n) + else + t = sequencer.tostring(t) + end + return loadstring(t)() +end + +local function localize(str) + return (gsub(str,"%.","_")) +end + +local template = [[ +%s +return function(...) +%s +end]] + +function sequencer.tostring(t) + local list, order, kind, gskip, askip = t.list, t.order, t.kind, t.gskip, t.askip + local vars, calls, args = { }, { }, nil + 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) + vars [#vars +1] = format("local %s = %s", localized, action) + calls[#calls+1] = format(" %s(...) -- %s %i", localized, group, i) + end + end + end + end + return format(template,concat(vars,"\n"),concat(calls,"\n")) +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 sequencer.nodeprocessor(t,n) + local list, order, kind, gskip, askip = t.list, t.order, t.kind, t.gskip, t.askip + local vars, calls, args = { }, { }, nil + if n == 0 then + args = "" + elseif n == 1 then + args = ",one" + elseif n == 2 then + args = ",one,two" + elseif n == 3 then + args = ",one,two,three" + elseif n == 4 then + args = ",one,two,three,four" + elseif n == 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) + vars[#vars+1] = format("local %s = %s",localized,action) + if kind[action] == "nohead" then + calls[#calls+1] = format(" ok = %s(head%s) done = done or ok -- %s %i",localized,args,group,i) + else + calls[#calls+1] = 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 |