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Diffstat (limited to 'lualibs-util-sta.lua')
| -rw-r--r-- | lualibs-util-sta.lua | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/lualibs-util-sta.lua b/lualibs-util-sta.lua new file mode 100644 index 0000000..1a61ec4 --- /dev/null +++ b/lualibs-util-sta.lua @@ -0,0 +1,342 @@ +if not modules then modules = { } end modules ['util-sta'] = { + version = 1.001, + comment = "companion to util-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local insert, remove, fastcopy, concat = table.insert, table.remove, table.fastcopy, table.concat +local format = string.format +local select, tostring = select, tostring + +local trace_stacker = false trackers.register("stacker.resolve", function(v) trace_stacker = v end) + +local stacker = stacker or { } + +utilities.stacker = stacker + +local function start(s,t,first,last) + if s.mode == "switch" then + local n = tostring(t[last]) + if trace_stacker then + s.report("start: %s",n) + end + return n + else + local r = { } + for i=first,last do + r[#r+1] = tostring(t[i]) + end + local n = concat(r," ") + if trace_stacker then + s.report("start: %s",n) + end + return n + end +end + +local function stop(s,t,first,last) + if s.mode == "switch" then + local n = tostring(false) + if trace_stacker then + s.report("stop: %s",n) + end + return n + else + local r = { } + for i=last,first,-1 do + r[#r+1] = tostring(false) + end + local n = concat(r," ") + if trace_stacker then + s.report("stop: %s",n) + end + return n + end +end + +local function change(s,t1,first1,last1,t2,first2,last2) + if s.mode == "switch" then + local n = tostring(t2[last2]) + if trace_stacker then + s.report("change: %s",n) + end + return n + else + local r = { } + for i=last1,first1,-1 do + r[#r+1] = tostring(false) + end + local n = concat(r," ") + for i=first2,last2 do + r[#r+1] = tostring(t2[i]) + end + if trace_stacker then + s.report("change: %s",n) + end + return n + end +end + +function stacker.new(name) + + local s + + local stack = { } + local list = { } + local ids = { } + local hash = { } + + local hashing = true + + local function push(...) + for i=1,select("#",...) do + insert(stack,(select(i,...))) -- watch the () + end + if hashing then + local c = concat(stack,"|") + local n = hash[c] + if not n then + n = #list+1 + hash[c] = n + list[n] = fastcopy(stack) + end + insert(ids,n) + return n + else + local n = #list+1 + list[n] = fastcopy(stack) + insert(ids,n) + return n + end + end + + local function pop() + remove(stack) + remove(ids) + return ids[#ids] or s.unset or -1 + end + + local function clean() + if #stack == 0 then + if trace_stacker then + s.report("%s list entries, %s stack entries",#list,#stack) + end + end + end + + local tops = { } + local top, switch + + local function resolve_begin(mode) + if mode then + switch = mode == "switch" + else + switch = s.mode == "switch" + end + top = { switch = switch } + insert(tops,top) + end + + local function resolve_step(ti) -- keep track of changes outside function ! + -- todo: optimize for n=1 etc + local result = nil + local noftop = #top + if ti > 0 then + local current = list[ti] + if current then + local noflist = #current + local nofsame = 0 + if noflist > noftop then + for i=1,noflist do + if current[i] == top[i] then + nofsame = i + else + break + end + end + else + for i=1,noflist do + if current[i] == top[i] then + nofsame = i + else + break + end + end + end + local plus = nofsame + 1 + if plus <= noftop then + if plus <= noflist then + if switch then + result = s.change(s,top,plus,noftop,current,nofsame,noflist) + else + result = s.change(s,top,plus,noftop,current,plus,noflist) + end + else + if switch then + result = s.change(s,top,plus,noftop,current,nofsame,noflist) + else + result = s.stop(s,top,plus,noftop) + end + end + elseif plus <= noflist then + if switch then + result = s.start(s,current,nofsame,noflist) + else + result = s.start(s,current,plus,noflist) + end + end + top = current + else + if 1 <= noftop then + result = s.stop(s,top,1,noftop) + end + top = { } + end + return result + else + if 1 <= noftop then + result = s.stop(s,top,1,noftop) + end + top = { } + return result + end + end + + local function resolve_end() + -- resolve_step(s.unset) + local noftop = #top + if noftop > 0 then + local result = s.stop(s,top,1,#top) + remove(tops) + top = tops[#tops] + switch = top and top.switch + return result + end + end + + local function resolve(t) + resolve_begin() + for i=1,#t do + resolve_step(t[i]) + end + resolve_end() + end + + local report = logs.reporter("stacker",name or nil) + + s = { + name = name or "unknown", + unset = -1, + report = report, + start = start, + stop = stop, + change = change, + push = push, + pop = pop, + clean = clean, + resolve = resolve, + resolve_begin = resolve_begin, + resolve_step = resolve_step, + resolve_end = resolve_end, + } + + return s -- we can overload functions + +end + +-- local s = utilities.stacker.new("demo") +-- +-- local unset = s.unset +-- local push = s.push +-- local pop = s.pop +-- +-- local t = { +-- unset, +-- unset, +-- push("a"), -- a +-- push("b","c"), -- a b c +-- pop(), -- a b +-- push("d"), -- a b d +-- pop(), -- a b +-- unset, +-- pop(), -- a +-- pop(), -- b +-- unset, +-- unset, +-- } +-- +-- s.resolve(t) + +-- demostacker = utilities.stacker.new("demos") +-- +-- local whatever = { +-- one = "1 0 0 RG 1 0 0 rg", +-- two = "1 1 0 RG 1 1 0 rg", +-- [false] = "0 G 0 g", +-- } +-- +-- local concat = table.concat +-- +-- local pdfliteral = nodes.pool.pdfliteral +-- +-- function demostacker.start(s,t,first,last) +-- local n = whatever[t[last]] +-- -- s.report("start: %s",n) +-- return pdfliteral(n) +-- end +-- +-- function demostacker.stop(s,t,first,last) +-- local n = whatever[false] +-- -- s.report("stop: %s",n) +-- return pdfliteral(n) +-- end +-- +-- function demostacker.change(s,t1,first1,last1,t2,first2,last2) +-- local n = whatever[t2[last2]] +-- -- s.report("change: %s",n) +-- return pdfliteral(n) +-- end +-- +-- demostacker.mode = "switch" +-- +-- local whatever = { +-- one = "/OC /test1 BDC", +-- two = "/OC /test2 BDC", +-- [false] = "EMC", +-- } +-- +-- demostacker = utilities.stacker.new("demos") +-- +-- function demostacker.start(s,t,first,last) +-- local r = { } +-- for i=first,last do +-- r[#r+1] = whatever[t[i]] +-- end +-- -- s.report("start: %s",concat(r," ")) +-- return pdfliteral(concat(r," ")) +-- end +-- +-- function demostacker.stop(s,t,first,last) +-- local r = { } +-- for i=last,first,-1 do +-- r[#r+1] = whatever[false] +-- end +-- -- s.report("stop: %s",concat(r," ")) +-- return pdfliteral(concat(r," ")) +-- end +-- +-- function demostacker.change(s,t1,first1,last1,t2,first2,last2) +-- local r = { } +-- for i=last1,first1,-1 do +-- r[#r+1] = whatever[false] +-- end +-- for i=first2,last2 do +-- r[#r+1] = whatever[t2[i]] +-- end +-- -- s.report("change: %s",concat(r," ")) +-- return pdfliteral(concat(r," ")) +-- end +-- +-- demostacker.mode = "stack" |