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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 glue = node.id("glue")
local penalty = node.id("penalty")
local kern = node.id("kern")
local glyph = node.id("glyph")
local whatsit = node.id("whatsit")
local hlist = node.id("hlist")
local find_node_tail = node.tail or node.slide
local chardata = characters.data
function nodes.the_left_margin(n) -- todo: three values
while n do
local id = n.id
if id == glue then
if n.subtype == 8 then -- 7 in c/web source
return n.spec.width
else
return 0
end
elseif id == whatsit then
n = n.next
elseif id == hlist then
return n.width
else
break
end
end
return 0
end
function nodes.the_right_margin(n)
if n then
n = find_node_tail(n)
while n do
local id = n.id
if id == glue then
if n.subtype == 9 then -- 8 in the c/web source
return n.spec.width
else
return 0
end
elseif id == whatsit then
n = n.prev
else
break
end
end
end
return false
end
function nodes.somespace(n,all)
if n then
local id = n.id
if id == glue then
return (all or (n.spec.width ~= 0)) and glue
elseif id == kern then
return (all or (n.kern ~= 0)) and kern
elseif id == glyph then
local category = chardata[n.char].category
-- maybe more category checks are needed
return (category == "zs") and glyph
end
end
return false
end
function nodes.somepenalty(n,value)
if n then
local id = n.id
if id == penalty then
if value then
return n.penalty == value
else
return true
end
end
end
return false
end
function nodes.is_display_math(head)
local n = head.prev
while n do
local id = n.id
if id == penalty then
elseif id == glue then
if n.subtype == 6 then -- above_display_short_skip
return true
end
else
break
end
n = n.prev
end
n = head.next
while n do
local id = n.id
if id == penalty then
elseif id == glue then
if n.subtype == 7 then -- below_display_short_skip
return true
end
else
break
end
n = n.next
end
return false
end
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