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if not modules then modules = { } end modules ['node-dir'] = {
version = 1.001,
comment = "companion to node-ini.mkiv",
author = "Taco Hoekwater and Hans Hagen",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is experimental code, so when I change it I need to check other modules
-- too.
--
-- Local par nodes are somewhat special. They start a paragraph and then register
-- the par direction. But they can also show op mid paragraph in which case they
-- register boxes and penalties. In that case the direction should not be affected.
--
-- We can assume that when hpack and prelinebreak filters are called, a local par
-- still sits at the head, but after a linebreak pass this node can be after the
-- leftskip (when present).
local nodes = nodes
local nuts = nodes.nuts
local nodecodes = nodes.nodecodes
local localpar_code = nodecodes.localpar
local getid = nuts.getid
local getsubtype = nuts.getsubtype
local getdirection = nuts.getdirection
local dirvalues = nodes.dirvalues
local lefttoright = dirvalues.lefttoright
local righttoleft = dirvalues.righttoleft
local localparnewgraf_code = 0
local function newstack(head,direction)
local stack = { }
local top = 0
if head and getid(head) == localpar_code and getsubtype(head) == localparnewgraf_code then
direction = getdirection(head)
end
if not direction then
direction = lefttoright
elseif direction == "TLT" then
direction = lefttoright
elseif direction == "TRT" then
direction = righttoleft
end
local function update(node)
local dir, pop = getdirection(node)
if not pop then
top = top + 1
stack[top] = dir
return dir
elseif top == 0 then
return direction
elseif top == 1 then
top = 0
return direction
else
top = top - 1
return stack[top]
end
end
return direction, update
end
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