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if not modules then modules = { } end modules ['anch-snc'] = {
version = 1.001,
comment = "companion to anch-snc.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tonumber, next, setmetatable = tonumber, next, setmetatable
local concat, sort, remove, copy = table.concat, table.sort, table.remove, table.copy
local match, find = string.match, string.find
local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
local setmetatableindex = table.setmetatableindex
local P, Cc = lpeg.P, lpeg.Cc
graphics = graphics or { }
local synchronizers = { }
graphics.synchronizers = synchronizers
local p_number = lpegpatterns.cardinal/tonumber
local p_space = lpegpatterns.whitespace^0
local p_tag = P("syncpos:") * p_number * P(":") * p_number
local p_option = p_number * ((P(",") * p_space * P("reset") * Cc(true)) + Cc(false)) -- for now
local list = { }
local kinds = {
above = 1,
continue = 2,
nothing = 3,
normal = 4,
below = 5,
}
local allentries = setmetatableindex(function(t,category)
setmetatable(t,nil)
for tag, pos in next, job.positions.collected do
local c, n = lpegmatch(p_tag,tag)
if c then
local tc = t[c]
if tc then
tc[n] = pos
else
t[c] = { [n] = pos }
end
end
end
for k, list in next, t do
sort(list,function(a,b)
local ap = a.p
local bp = b.p
if ap == bp then
return b.y < a.y
else
return ap < bp
end
end)
list.start = 1
end
setmetatableindex(t,"table")
return t[category]
end)
local lastdone = { }
function synchronizers.collect(category,realpage,region)
local all = allentries[category]
local m = 0
local n = #all
list = { }
if region and region ~= "" then
-- successive can be optimized when we sort by region
local start = 1
local done = false
local last, rtop, rbot
for i=start,n do
local pos = all[i]
local p = pos.p
local r = pos.r
if r == region then
if not done then
local region = job.positions.collected[r]
list.region = region
list.page = region
rtop = (region.y or 0) + (region.h or 0)
rbot = (region.y or 0) - (region.d or 0)
last = { kind = "nothing", top = rtop, bottom = 0, task = 0 }
m = m + 1 ; list[m] = last
done = true
end
local top = pos.y + pos.h
last.bottom = top
local task, reset = lpegmatch(p_option,pos.e)
last = { kind = "normal", top = top, bottom = 0, task = task }
m = m + 1 ; list[m] = last
end
end
if done then
last.bottom = rbot
end
else
local start = all.start or 1
local done = false
local last, rtop, rbot, ptop, pbot
for i=start,n do
local pos = all[i]
local p = pos.p
if p == realpage then
if not done then
local region = job.positions.collected[pos.r]
local page = job.positions.collected["page:"..realpage] or region
list.region = region
list.page = page
rtop = (region.y or 0) + (region.h or 0)
rbot = (region.y or 0) - (region.d or 0)
ptop = (page .y or 0) + (page .h or 0)
pbot = (page .y or 0) - (page .d or 0)
last = { kind = "above", top = ptop, bottom = rtop, task = 0 }
m = m + 1 ; list[m] = last
if i > 1 then
local task, reset = lpegmatch(p_option,all[i-1].e)
last = { kind = "continue", top = rtop, bottom = 0, task = task }
m = m + 1 ; list[m] = last
else
last = { kind = "nothing", top = rtop, bottom = 0, task = 0 }
m = m + 1 ; list[m] = last
end
done = true
end
local top = pos.y + pos.h
last.bottom = top
local task, reset = lpegmatch(p_option,pos.e)
if reset then
local l = list[2]
l.kind = "nothing"
l.task = 0
end
last = { kind = "normal", top = top, bottom = 0, task = task }
m = m + 1 ; list[m] = last
elseif p > realpage then
all.start = i -- tricky, only for page
break
end
end
if done then
last.bottom = rbot
last = { kind = "below", top = rbot, bottom = pbot, task = 0 }
m = m + 1 ; list[m] = last
lastdone[category] = {
{ kind = "above", top = ptop, bottom = rtop, task = 0 },
{ kind = "continue", top = rtop, bottom = rbot, task = list[#list-1].task }, -- lasttask
{ kind = "below", top = rbot, bottom = pbot, task = 0 },
region = list.region,
page = list.page,
}
else
local l = lastdone[category]
if l then
list = copy(l) -- inefficient, maybe metatable for region/page
m = 3
end
end
end
return m
end
function synchronizers.extend()
local n = #list
if n > 0 then
for i=1,n do
local l = list[i]
local k = l.kind
if k == "nothing" then
local ll = list[i+1]
if ll and ll.kind == "normal" then
ll.top = l.top
remove(list,i)
n = #list
break
end
end
end
end
return n
end
function synchronizers.prune()
local n = #list
if n > 0 then
if list[1].kind == "above" then
remove(list,1)
end
if list[1].kind == "nothing" then
remove(list,1)
end
if list[#list].kind == "below" then
remove(list,#list)
end
n = #list
end
return n
end
function synchronizers.collapse()
local n = #list
if n > 0 then
local m = 0
local p = nil
for i=1,n do
local l = list[i]
local t = l.task
if p == t then
list[m].bottom = l.bottom
else
m = m + 1
list[m] = l
end
p = t
end
for i=n,m+1,-1 do
list[i] = nil
end
n = m
end
return n
end
function synchronizers.getsize () return #list end
function synchronizers.gettop (n) return list[n].top end
function synchronizers.getbottom(n) return list[n].bottom end
function synchronizers.getkind (n) return kinds[list[n].kind] end
function synchronizers.gettask (n) return list[n].task end
function synchronizers.getx() return list.page.x or 0 end
function synchronizers.gety() return list.page.y or 0 end
function synchronizers.getw() return list.page.w or 0 end
function synchronizers.geth() return list.page.h or 0 end
function synchronizers.getd() return list.page.d or 0 end
-- function mp.xxOverlayRegion()
-- local r = tokens.getters.macro("m_overlay_region")
-- mp.quoted('"'.. r .. '"')
-- end
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