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if not modules then modules = { } end modules ['node-aux'] = {
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 nodecodes = nodes.nodecodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local traverse_nodes = node.traverse
local free_node = node.free
local hpack_nodes = node.hpack
local has_attribute = node.has_attribute
local set_attribute = node.set_attribute
local get_attribute = node.get_attribute
local unset_attribute = node.unset_attribute
function nodes.repack_hlist(list,...)
local temp, b = hpack_nodes(list,...)
list = temp.list
temp.list = nil
free_node(temp)
return list, b
end
local function set_attributes(head,attr,value)
for n in traverse_nodes(head) do
set_attribute(n,attr,value)
local id = n.id
if id == hlist_node or id == vlist_node then
set_attributes(n.list,attr,value)
end
end
end
local function set_unset_attributes(head,attr,value)
for n in traverse_nodes(head) do
if not has_attribute(n,attr) then
set_attribute(n,attr,value)
end
local id = n.id
if id == hlist_code or id == vlist_code then
set_unset_attributes(n.list,attr,value)
end
end
end
local function unset_attributes(head,attr)
for n in traverse_nodes(head) do
unset_attribute(n,attr)
local id = n.id
if id == hlist_code or id == vlist_code then
unset_attributes(n.list,attr)
end
end
end
nodes.set_attribute = set_attribute
nodes.unset_attribute = unset_attribute
nodes.has_attribute = has_attribute
nodes.set_attributes = set_attributes
nodes.set_unset_attributes = set_unset_attributes
nodes.unset_attributes = unset_attributes
-- history:
--
-- local function cp_skipable(a,id) -- skipable nodes at the margins during character protrusion
-- return (
-- id ~= glyph_node
-- or id == ins_node
-- or id == mark_node
-- or id == adjust_node
-- or id == penalty_node
-- or (id == glue_node and a.spec.writable)
-- or (id == disc_node and a.pre == nil and a.post == nil and a.replace == nil)
-- or (id == math_node and a.surround == 0)
-- or (id == kern_node and (a.kern == 0 or a.subtype == NORMAL))
-- or (id == hlist_node and a.width == 0 and a.height == 0 and a.depth == 0 and a.list == nil)
-- or (id == whatsit_node and a.subtype ~= pdf_refximage_node and a.subtype ~= pdf_refxform_node)
-- )
-- end
--
-- local function glyph_width(a)
-- local ch = chardata[a.font][a.char]
-- return (ch and ch.width) or 0
-- end
--
-- local function glyph_total(a)
-- local ch = chardata[a.font][a.char]
-- return (ch and (ch.height+ch.depth)) or 0
-- end
--
-- local function non_discardable(a) -- inline
-- return a.id < math_node -- brrrr
-- end
--
-- local function calculate_badness(t,s)
-- if t == 0 then
-- return 0
-- elseif s <= 0 then
-- return INF_BAD
-- else
-- local r
-- if t <= 7230584 then
-- r = t * 297 / s
-- elseif s >= 1663497 then
-- r = t / floor(s / 297)
-- else
-- r = t
-- end
-- r = floor(r)
-- if r > 1290 then
-- return INF_BAD
-- else
-- return floor((r * r * r + 0x20000) / 0x40000) -- 0400000 / 01000000
-- end
-- end
-- end
--
-- left-overs
--
-- local function round_xn_over_d(x, n, d)
-- local positive -- was x >= 0
-- if x >= 0 then
-- positive = true
-- else
-- x = -x
-- positive = false
-- end
-- local t = floor(x % 0x8000) * n -- 0100000
-- local f = floor(t / 0x8000) -- 0100000
-- local u = floor(x / 0x8000) * n + f -- 0100000
-- local v = floor(u % d) * 0x8000 + f -- 0100000
-- if floor(u / d) >= 0x8000 then -- 0100000
-- logs.error("parbuilder",'arith_error')
-- else
-- u = 0x8000 * floor(u / d) + floor(v / d) -- 0100000
-- end
-- v = floor(v % d)
-- if 2*v >= d then
-- u = u + 1
-- end
-- if positive then
-- return u
-- else
-- return -u
-- end
-- end
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