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if not modules then modules = { } end modules ['node-acc'] = {
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 tasks = nodes.tasks
local nuts = nodes.nuts
local tonut = nodes.tonut
local tonode = nodes.tonode
local getid = nuts.getid
local getfield = nuts.getfield
local getattr = nuts.getattr
local getlist = nuts.getlist
local getchar = nuts.getchar
local getnext = nuts.getnext
local setfield = nuts.setfield
local setattr = nuts.setattr
local setlink = nuts.setlink
local setchar = nuts.setchar
local setsubtype = nuts.setsubtype
local traverse_nodes = nuts.traverse
local traverse_id = nuts.traverse_id
local copy_node = nuts.copy
local free_nodelist = nuts.flush_list
local insert_after = nuts.insert_after
local glue_code = nodecodes.glue
local kern_code = nodecodes.kern
local glyph_code = nodecodes.glyph
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local a_characters = attributes.private("characters")
local threshold = 65536 -- not used
local nofreplaced = 0
-- todo: nbsp etc
-- todo: collapse kerns
-- p_id
local function injectspaces(head)
local p, p_id
local n = head
while n do
local id = getid(n)
if id == glue_code then -- todo: check for subtype related to spacing (13/14 but most seems to be 0)
-- if getfield(n,."width") > 0 then -- threshold
-- if p and p_id == glyph_code then
if p and getid(p) == glyph_code then
local g = copy_node(p)
local c = getfield(g,"components")
if c then -- it happens that we copied a ligature
free_nodelist(c)
setfield(g,"components",nil)
setsubtype(g,256)
end
local a = getattr(n,a_characters)
setchar(g,32)
setlink(p,g)
setlink(g,n)
-- we could cache as we now create many nodes
setfield(n,"width",getfield(n,"width") - getfield(g,"width"))
if a then
setattr(g,a_characters,a)
end
setattr(n,a_characters,0)
nofreplaced = nofreplaced + 1
end
-- end
elseif id == hlist_code or id == vlist_code then
injectspaces(getlist(n),attribute)
-- elseif id == kern_code then -- the backend already collapses
-- local first = n
-- while true do
-- local nn = getnext(n)
-- if nn and getid(nn) == kern_code then
-- -- maybe we should delete kerns but who cares at this stage
-- setfield(first,"kern",getfield(first,"kern") + getfield(nn,"kern")
-- setfield(nn,"kern",0)
-- n = nn
-- else
-- break
-- end
-- end
end
p_id = id
p = n
n = getnext(n)
end
return head, true -- always done anyway
end
nodes.handlers.accessibility = function(head)
local head, done = injectspaces(tonut(head))
return tonode(head), done
end
statistics.register("inserted spaces in output",function()
if nofreplaced > 0 then
return nofreplaced
end
end)
-- todo:
-- local a_hyphenated = attributes.private('hyphenated')
--
-- local hyphenated, codes = { }, { }
--
-- local function compact(n)
-- local t = { }
-- for n in traverse_id(glyph_code,n) do
-- t[#t+1] = utfchar(getchar(n)) -- check for unicode
-- end
-- return concat(t,"")
-- end
--
-- local function injectspans(head)
-- local done = false
-- for n in traverse_nodes(tonuts(head)) do
-- local id = getid(n)
-- if id == disc then
-- local r = getfield(n,"replace")
-- local p = getfield(n,"pre")
-- if r and p then
-- local str = compact(r)
-- local hsh = hyphenated[str]
-- if not hsh then
-- hsh = #codes + 1
-- hyphenated[str] = hsh
-- codes[hsh] = str
-- end
-- setattr(n,a_hyphenated,hsh)
-- done = true
-- end
-- elseif id == hlist_code or id == vlist_code then
-- injectspans(getlist(n))
-- end
-- end
-- return tonodes(head), done
-- end
--
-- nodes.injectspans = injectspans
--
-- tasks.appendaction("processors", "words", "nodes.injectspans")
--
-- local function injectspans(head)
-- local done = false
-- for n in traverse_nodes(tonut(head)) do
-- local id = getid(n)
-- if id == disc then
-- local a = getattr(n,a_hyphenated)
-- if a then
-- local str = codes[a]
-- local b = new_pdfliteral(format("/Span << /ActualText %s >> BDC", lpdf.tosixteen(str)))
-- local e = new_pdfliteral("EMC")
-- insert_before(head,n,b)
-- insert_after(head,n,e)
-- done = true
-- end
-- elseif id == hlist_code or id == vlist_code then
-- injectspans(getlist(n))
-- end
-- end
-- return tonodes(head), done
-- end
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