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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"
}
-- todo: n1 .. n2 : __concat metatable
local type, tostring = type, tostring
local nodes, node = nodes, node
local utfvalues = utf.values
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local attributelist_code = nodecodes.attributelist -- temporary
local math_code = nodecodes.math
local nuts = nodes.nuts
local tonut = nuts.tonut
local tonode = nuts.tonode
local vianuts = nuts.vianuts
local getbox = nuts.getbox
local getnext = nuts.getnext
local getid = nuts.getid
local getsubtype = nuts.getsubtype
local getlist = nuts.getlist
local getfont = nuts.getfont
local getchar = nuts.getchar
local getattr = nuts.getattr
local setfield = nuts.setfield
local setattr = nuts.setattr
local traverse_nodes = nuts.traverse
local traverse_id = nuts.traverse_id
local free_node = nuts.free
local hpack_nodes = nuts.hpack
local unset_attribute = nuts.unset_attribute
local first_glyph = nuts.first_glyph
local copy_node = nuts.copy
local copy_node_list = nuts.copy_list
local find_tail = nuts.tail
local insert_node_after = nuts.insert_after
local isnode = nuts.is_node
local getbox = nuts.getbox
local nodes_traverse_id = nodes.traverse_id
local nodes_first_glyph = nodes.first_glyph
local nodepool = nuts.pool
local new_glue = nodepool.glue
local new_glyph = nodepool.glyph
local unsetvalue = attributes.unsetvalue
local current_font = font.current
local texsetbox = tex.setbox
local report_error = logs.reporter("node-aux:error")
-- At some point we figured that copying before using was the safest bet
-- when dealing with boxes at the tex end. This is because tex also needs
-- to manage the grouping (i.e. savestack). However, there is an easy
-- solution that keeps the tex end happy as tex.setbox deals with this. The
-- overhead of one temporary list node is neglectable.
--
-- function tex.takebox(id)
-- local box = tex.getbox(id)
-- if box then
-- local copy = node.copy(box)
-- local list = box.list
-- copy.list = list
-- box.list = nil
-- tex.setbox(id,nil)
-- return copy
-- end
-- end
local function takebox(id)
local box = getbox(id)
if box then
local copy = copy_node(box)
local list = getlist(box)
setfield(copy,"list",list)
setfield(box,"list",nil)
texsetbox(id,nil)
return copy
end
end
function nodes.takebox(id)
local b = takebox(id)
if b then
return tonode(b)
end
end
nuts.takebox = takebox
tex.takebox = nodes.takebox -- sometimes more clear
-- so far
local function repackhlist(list,...)
local temp, b = hpack_nodes(list,...)
list = getlist(temp)
setfield(temp,"list",nil)
free_node(temp)
return list, b
end
nuts.repackhlist = repackhlist
function nodes.repackhlist(list,...)
local list, b = repackhlist(tonut(list),...)
return tonode(list), b
end
local function set_attributes(head,attr,value)
for n in traverse_nodes(head) do
setattr(n,attr,value)
local id = getid(n)
if id == hlist_node or id == vlist_node then
set_attributes(getlist(n),attr,value)
end
end
end
local function set_unset_attributes(head,attr,value)
for n in traverse_nodes(head) do
if not getattr(n,attr) then
setattr(n,attr,value)
end
local id = getid(n)
if id == hlist_code or id == vlist_code then
set_unset_attributes(getlist(n),attr,value)
end
end
end
local function unset_attributes(head,attr)
for n in traverse_nodes(head) do
setattr(n,attr,unsetvalue)
local id = getid(n)
if id == hlist_code or id == vlist_code then
unset_attributes(getlist(n),attr)
end
end
end
-- for old times sake
nuts.setattribute = nuts.setattr nodes.setattribute = nodes.setattr
nuts.getattribute = nuts.getattr nodes.getattribute = nodes.getattr
nuts.unsetattribute = nuts.unset_attribute nodes.unsetattribute = nodes.unset_attribute
nuts.has_attribute = nuts.has_attribute nodes.has_attribute = nodes.has_attribute
nuts.firstglyph = nuts.first_glyph nodes.firstglyph = nodes.first_glyph
nuts.setattributes = set_attributes nodes.setattributes = vianuts(set_attributes)
nuts.setunsetattributes = set_unset_attributes nodes.setunsetattributes = vianuts(set_unset_attributes)
nuts.unsetattributes = unset_attributes nodes.unsetattributes = vianuts(unset_attributes)
-- history:
--
-- function nodes.is_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 getfield(a,"pre") == nil and getfield(a,"post") == nil and getfield(a,"replace") == nil)
-- or (id == math_node and getfield(a,"surround") == 0)
-- or (id == kern_node and (getfield(a,"kern") == 0 or getsubtype(subtype) == NORMAL))
-- or (id == hlist_node and getfield(a,"width") == 0 and getfield(a,"height") == 0 and getfield(a,"depth") == 0 and getlist(a) == nil)
-- or (id == whatsit_node and getsubtype(a) ~= pdf_refximage_node and getsubtype(a) ~= pdf_refxform_node)
-- )
-- end
--
-- local function glyph_width(a)
-- local ch = chardata[getfont(a)][getchar(a)]
-- return (ch and ch.width) or 0
-- end
--
-- local function glyph_total(a)
-- local ch = chardata[getfont(a)][getchar(a)]
-- return (ch and (ch.height+ch.depth)) or 0
-- end
--
-- local function non_discardable(a) -- inline
-- return getid(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
-- report_parbuilders('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
--
-- if not node.end_of_math then
-- function node.end_of_math(n)
-- for n in traverse_id(math_code,getnext(next)) do
-- return n
-- end
-- end
-- end
--
-- nodes.endofmath = node.end_of_math
--
-- local function firstline(n)
-- while n do
-- local id = getid(n)
-- if id == hlist_code then
-- if getsubtype(n) == line_code then
-- return n
-- else
-- return firstline(getlist(n))
-- end
-- elseif id == vlist_code then
-- return firstline(getlist(n))
-- end
-- n = getnext(n)
-- end
-- end
--
-- nodes.firstline = firstline
function nuts.firstcharacter(n,untagged) -- tagged == subtype > 255
if untagged then
return first_glyph(n)
else
for g in traverse_id(glyph_code,n) do
return g
end
end
end
-- function nodes.firstcharacter(n,untagged) -- tagged == subtype > 255
-- if untagged then
-- return nodes_first_glyph(n)
-- else
-- for g in nodes_traverse_id(glyph_code,n) do
-- return g
-- end
-- end
-- end
local function firstcharinbox(n)
local l = getlist(getbox(n))
if l then
for g in traverse_id(glyph_code,l) do
return getchar(g)
end
end
return 0
end
nuts .firstcharinbox = firstcharinbox
nodes.firstcharinbox = firstcharinbox
nodes.firstcharacter = vianuts(firstcharacter)
function commands.buildtextaccent(n)
local char = firstcharinbox(n)
if char > 0 then
-- context.accent(false,char)
context([[\accent%s\relax]],char)
end
end
-- this depends on fonts, so we have a funny dependency ... will be
-- sorted out .. we could make tonodes a plugin into this
local function tonodes(str,fnt,attr) -- (str,template_glyph) -- moved from blob-ini
if not str or str == "" then
return
end
local head, tail, space, fnt, template = nil, nil, nil, nil, nil
if not fnt then
fnt = current_font()
elseif type(fnt) ~= "number" and getid(fnt) == glyph_code then -- so it has to be a real node
fnt, template = nil, tonut(fnt)
end
for s in utfvalues(str) do
local n
if s == 32 then
if space then
n = copy_node(space)
elseif fonts then -- depedency
local parameters = fonts.hashes.identifiers[fnt].parameters
space = new_glue(parameters.space,parameters.space_stretch,parameters.space_shrink)
n = space
end
elseif template then
n = copy_node(template)
setvalue(n,"char",s)
else
n = new_glyph(fnt,s)
end
if attr then -- normally false when template
setfield(n,"attr",copy_node_list(attr))
end
if head then
insert_node_after(head,tail,n)
else
head = n
end
tail = n
end
return head, tail
end
nuts.tonodes = tonodes
nodes.tonodes = function(str,fnt,attr)
local head, tail = tonodes(str,fnt,attr)
return tonode(head), tonode(tail)
end
-- local function link(list,currentfont,currentattr,head,tail)
-- for i=1,#list do
-- local n = list[i]
-- if n then
-- local tn = isnode(n)
-- if not tn then
-- local tn = type(n)
-- if tn == "number" then
-- if not currentfont then
-- currentfont = current_font()
-- end
-- local h, t = tonodes(tostring(n),currentfont,currentattr)
-- if not h then
-- -- skip
-- elseif not head then
-- head = h
-- tail = t
-- else
-- setfield(tail,"next",h)
-- setfield(h,"prev",t)
-- tail = t
-- end
-- elseif tn == "string" then
-- if #tn > 0 then
-- if not currentfont then
-- currentfont = current_font()
-- end
-- local h, t = tonodes(n,currentfont,currentattr)
-- if not h then
-- -- skip
-- elseif not head then
-- head, tail = h, t
-- else
-- setfield(tail,"next",h)
-- setfield(h,"prev",t)
-- tail = t
-- end
-- end
-- elseif tn == "table" then
-- if #tn > 0 then
-- if not currentfont then
-- currentfont = current_font()
-- end
-- head, tail = link(n,currentfont,currentattr,head,tail)
-- end
-- end
-- elseif not head then
-- head = n
-- tail = find_tail(n)
-- elseif getid(n) == attributelist_code then
-- -- weird case
-- report_error("weird node type in list at index %s:",i)
-- for i=1,#list do
-- local l = list[i]
-- report_error("%3i: %s %S",i,getid(l) == attributelist_code and "!" or ">",l)
-- end
-- os.exit()
-- else
-- setfield(tail,"next",n)
-- setfield(n,"prev",tail)
-- if getnext(n) then
-- tail = find_tail(n)
-- else
-- tail = n
-- end
-- end
-- else
-- -- permitting nil is convenient
-- end
-- end
-- return head, tail
-- end
local function link(list,currentfont,currentattr,head,tail) -- an oldie, might be replaced
for i=1,#list do
local n = list[i]
if n then
local tn = type(n)
if tn == "string" then
if #tn > 0 then
if not currentfont then
currentfont = current_font()
end
local h, t = tonodes(n,currentfont,currentattr)
if not h then
-- skip
elseif not head then
head, tail = h, t
else
setfield(tail,"next",h)
setfield(h,"prev",t)
tail = t
end
end
elseif tn == "table" then
if #tn > 0 then
if not currentfont then
currentfont = current_font()
end
head, tail = link(n,currentfont,currentattr,head,tail)
end
elseif not head then
head = n
tail = find_tail(n)
elseif getid(n) == attributelist_code then
-- weird case
report_error("weird node type in list at index %s:",i)
for i=1,#list do
local l = list[i]
report_error("%3i: %s %S",i,getid(l) == attributelist_code and "!" or ">",l)
end
os.exit()
else
setfield(tail,"next",n)
setfield(n,"prev",tail)
if getnext(n) then
tail = find_tail(n)
else
tail = n
end
end
else
-- permitting nil is convenient
end
end
return head, tail
end
nuts.link = link
nodes.link = function(list,currentfont,currentattr,head,tail)
local head, tail = link(list,currentfont,currentattr,tonut(head),tonut(tail))
return tonode(head), tonode(tail)
end
local function locate(start,wantedid,wantedsubtype)
for n in traverse_nodes(start) do
local id = getid(n)
if id == wantedid then
if not wantedsubtype or getsubtype(n) == wantedsubtype then
return n
end
elseif id == hlist_code or id == vlist_code then
local found = locate(getlist(n),wantedid,wantedsubtype)
if found then
return found
end
end
end
end
nuts.locate = locate
nodes.locate = function(start,wantedid,wantedsubtype)
local found = locate(tonut(start),wantedid,wantedsubtype)
return found and tonode(found)
end
-- I have no use for this yet:
--
-- \skip0=10pt plus 2pt minus 2pt
-- \cldcontext{"\letterpercent p",tex.stretch_amount(tex.skip[0],1000)} -- 14.30887pt
--
-- local gluespec_code = nodes.nodecodes.gluespec
--
-- function tex.badness_to_ratio(badness)
-- return (badness/100)^(1/3)
-- end
--
-- function tex.stretch_amount(skip,badness) -- node no nut
-- if skip.id == gluespec_code then
-- return skip.width + (badness and (badness/100)^(1/3) or 1) * skip.stretch
-- else
-- return 0
-- end
-- end
|