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if not modules then modules = { } end modules ['node-tst'] = {
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"
}
local nodes, node = nodes, node
local chardata = characters.data
local nodecodes = nodes.nodecodes
local skipcodes = nodes.skipcodes
local glue_code = nodecodes.glue
local penalty_code = nodecodes.penalty
local kern_code = nodecodes.kern
local glyph_code = nodecodes.glyph
local whatsit_code = nodecodes.whatsit
local hlist_code = nodecodes.hlist
local leftskip_code = skipcodes.leftskip
local rightskip_code = skipcodes.rightskip
local abovedisplayshortskip_code = skipcodes.abovedisplayshortskip
local belowdisplayshortskip_code = skipcodes.belowdisplayshortskip
local nuts = nodes.nuts
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getchar = nuts.getchar
local getsubtype = nuts.getsubtype
local getkern = nuts.getkern
local getpenalty = nuts.getpenalty
local getwidth = nuts.getwidth
local find_node_tail = nuts.tail
function nuts.leftmarginwidth(n) -- todo: three values
while n do
local id = getid(n)
if id == glue_code then
return getsubtype(n) == leftskip_code and getwidth(n) or 0
elseif id == whatsit_code then
n = getnext(n)
elseif id == hlist_code then
return getwidth(n)
else
break
end
end
return 0
end
function nuts.rightmarginwidth(n)
if n then
n = find_node_tail(n)
while n do
local id = getid(n)
if id == glue_code then
return getsubtype(n) == rightskip_code and getwidth(n) or 0
elseif id == whatsit_code then
n = getprev(n)
else
break
end
end
end
return false
end
function nuts.somespace(n,all)
if n then
local id = getid(n)
if id == glue_code then
return (all or (getwidth(n) ~= 0)) and glue_code -- temp: or 0
elseif id == kern_code then
return (all or (getkern(n) ~= 0)) and kern
elseif id == glyph_code then
local category = chardata[getchar(n)].category
-- maybe more category checks are needed
return (category == "zs") and glyph_code
end
end
return false
end
function nuts.somepenalty(n,value)
if n then
local id = getid(n)
if id == penalty_code then
if value then
return getpenalty(n) == value
else
return true
end
end
end
return false
end
function nuts.is_display_math(head)
local n = getprev(head)
while n do
local id = getid(n)
if id == penalty_code then
elseif id == glue_code then
if getsubtype(n) == abovedisplayshortskip_code then
return true
end
else
break
end
n = getprev(n)
end
n = getnext(head)
while n do
local id = getid(n)
if id == penalty_code then
elseif id == glue_code then
if getsubtype(n) == belowdisplayshortskip_code then
return true
end
else
break
end
n = getnext(n)
end
return false
end
nodes.leftmarginwidth = nodes.vianuts(nuts.leftmarginwidth)
nodes.rightmarginwidth = nodes.vianuts(nuts.rightmarginwidth)
nodes.somespace = nodes.vianuts(nuts.somespace)
nodes.somepenalty = nodes.vianuts(nuts.somepenalty)
nodes.is_display_math = nodes.vianuts(nuts.is_display_math)
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