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if not modules then modules = { } end modules ['page-pst'] = {
version = 1.001,
comment = "companion to page-pst.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- todo: adapt message
local tonumber, next, type = tonumber, next, type
local find, validstring = string.find, string.valid
local context = context
local implement = interfaces.implement
local texgetcount = tex.getcount
local texsetcount = tex.setcount
local sortedkeys = table.sortedkeys
local formatters = string.formatters
local cache = { }
local function flush(page)
local c = cache[page]
if c then
for i=1,#c do
-- characters.showstring(c[i])
context.viafile(c[i],formatters["page.%s"](validstring(page,"nopage")))
end
cache[page] = nil
end
end
local function setnextpage()
local n = next(cache) and sortedkeys(cache)[1]
if not n then
n = 0 -- nothing in the cache
elseif n == 0 then
n = -1 -- generic buffer (0)
elseif n > 0 then
-- upcoming page (realpageno)
end
texsetcount("global","c_page_postponed_blocks_next_page",n)
end
local function flushpostponedblocks(specification)
-- we need to flush previously pending pages as well and the zero
-- slot is the generic one so that one is always flushed
local t = sortedkeys(cache)
local p = tonumber(specification.page) or texgetcount("realpageno") or 0
for i=1,#t do
local ti = t[i]
if ti <= p then
flush(ti)
else
break
end
end
setnextpage()
end
implement {
name = "flushpostponedblocks",
actions = flushpostponedblocks,
arguments = {
{
{ "page" }
}
}
}
local function registerpostponedblock(page)
if type(page) == "string" then
if find(page,"^+") then
page = texgetcount("realpageno") + (tonumber(page) or 1) -- future delta page
else
page = tonumber(page) or 0 -- preferred page or otherwise first possible occasion
end
end
if not page then
page = 0
end
local c = cache[page]
if not c then
c = { }
cache[page] = c
end
c[#c+1] = buffers.raw("postponedblock")
buffers.erase("postponedblock")
if page == 0 then
interfaces.showmessage("layouts",3,#c)
else
interfaces.showmessage("layouts",3,formatters["%s (realpage: %s)"](#c,page))
end
setnextpage()
end
implement {
name = "registerpostponedblock",
actions = registerpostponedblock,
arguments = "string"
}
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