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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 traverse_nodes = node.traverse
local traverse_id = node.traverse_id
local copy_node = node.copy
local free_nodelist = node.flush_list
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
-- todo: nbsp etc
-- todo: collapse kerns
local function injectspaces(head)
local p
local n = head
while n do
local id = n.id
if id == glue_code then -- todo: check for subtype related to spacing (13/14 but most seems to be 0)
-- if n.spec.width > 0 then -- threshold
if p and p.id == glyph_code then
local g = copy_node(p)
local c = g.components
if c then -- it happens that we copied a ligature
free_nodelist(c)
g.components = nil
g.subtype = 256
end
local a = n[a_characters]
local s = copy_node(n.spec)
g.char, n.spec = 32, s
p.next, g.prev = g, p
g.next, n.prev = n, g
s.width = s.width - g.width
if a then
g[a_characters] = a
end
s[a_characters] = 0
n[a_characters] = 0
end
-- end
elseif id == hlist_code or id == vlist_code then
injectspaces(n.list,attribute)
-- elseif id == kern_code then -- the backend already collapses
-- local first = n
-- while true do
-- local nn = n.next
-- if nn and nn.id == kern_code then
-- -- maybe we should delete kerns but who cares at this stage
-- first.kern = first.kern + nn.kern
-- nn.kern = 0
-- n = nn
-- else
-- break
-- end
-- end
end
p = n
n = n.next
end
return head, true
end
nodes.handlers.accessibility = injectspaces
-- 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(n.char) -- check for unicode
-- end
-- return concat(t,"")
-- end
--
-- local function injectspans(head)
-- for n in traverse_nodes(head) do
-- local id = n.id
-- if id == disc then
-- local r, p = n.replace, 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
-- n[a_hyphenated] = hsh
-- end
-- elseif id == hlist_code or id == vlist_code then
-- injectspans(n.list)
-- end
-- end
-- return head, true
-- end
--
-- nodes.injectspans = injectspans
--
-- tasks.appendaction("processors", "words", "nodes.injectspans")
--
-- local function injectspans(head)
-- for n in traverse_nodes(head) do
-- local id = n.id
-- if id == disc then
-- local a = 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")
-- node.insert_before(head,n,b)
-- node.insert_after(head,n,e)
-- end
-- elseif id == hlist_code or id == vlist_code then
-- injectspans(n.list)
-- end
-- end
-- end
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