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if not modules then modules = { } end modules ['typo-chr'] = {
version = 1.001,
comment = "companion to typo-bld.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- local nodecodes = nodes.nodecodes
-- local whatsitcodes = nodes.whatsitcodes
-- local glyph_code = nodecodes.glyph
-- local whatsit_code = nodecodes.whatsit
-- local user_code = whatsitcodes.userdefined
--
-- local stringusernode = nodes.pool.userstring
--
-- local nuts = nodes.nuts
-- local pool = nuts.pool
--
-- local tonut = nuts.tonut
-- local tonode = nuts.tonode
-- local getid = nuts.getid
-- local getprev = nuts.getprev
-- local getsubtype = nuts.getsubtype
-- local getchar = nuts.getchar
-- local getfield = nuts.getfield
--
-- local remove_node = nuts.remove
-- local traverse_by_id = nuts.traverse_id
--
-- local signal = pool.userids.signal
--
-- local is_punctuation = characters.is_punctuation
--
-- local actions = {
-- removepunctuation = function(head,n)
-- local prev = getprev(n)
-- if prev then
-- if getid(prev) == glyph_code then
-- if is_punctuation[getchar(prev)] then
-- head = remove_node(head,prev,true)
-- end
-- end
-- end
-- return head
-- end
-- }
--
-- -- we can also use properties .. todo (saves pass)
--
-- typesetters.signals = { }
--
-- function typesetters.signals.handler(head)
-- local h = tonut(head)
-- local done = false
-- for n in traverse_by_id(whatsit_code,h) do
-- if getsubtype(n) == user_code and getfield(n,"user_id") == signal and getfield(n,"type") == 115 then
-- local action = actions[getfield(n,"value")]
-- if action then
-- h = action(h,n)
-- end
-- h = remove_node(h,n,true)
-- done = true
-- end
-- end
-- if done then
-- return tonode(h), true
-- else
-- return head
-- end
-- end
--
-- local enabled = false
--
-- local function signal(what)
-- if not enabled then
-- nodes.tasks.prependaction("processors","normalizers", "typesetters.signals.handler")
-- enabled = true
-- end
-- context(stringusernode(signal,what))
-- end
--
-- interfaces.implement {
-- name = "signal",
-- actions = signal,
-- arguments = "string",
-- }
local insert, remove = table.insert, table.remove
local context = context
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local localpar_code = nodecodes.localpar
local texnest = tex.nest
local flush_node = node.flush_node
local flush_list = node.flush_list
local settexattribute = tex.setattribute
local punctuation = characters.is_punctuation
local variables = interfaces.variables
local v_all = variables.all
local v_reset = variables.reset
local a_marked = attributes.numbers['marked']
local lastmarked = 0
local marked = {
[v_all] = 1,
[""] = 1,
[v_reset] = attributes.unsetvalue,
}
local stack = { }
local function pickup()
local list = texnest[texnest.ptr]
if list then
local tail = list.tail
if tail and tail.id == glyph_code and punctuation[tail.char] then
local prev = tail.prev
list.tail = prev
if prev then
prev.next = nil
end
list.tail = prev
tail.prev = nil
return tail
end
end
end
local actions = {
remove = function(specification)
local n = pickup()
if n then
flush_node(n)
end
end,
push = function(specification)
local n = pickup()
if n then
insert(stack,n or false)
end
end,
pop = function(specification)
local n = remove(stack)
if n then
context(n)
end
end,
}
local function pickuppunctuation(specification)
local action = actions[specification.action or "remove"]
if action then
action(specification)
end
end
-- I played with nested marked content but it makes no sense and gives
-- complex code. Also, it's never needed so why bother.
local function pickup(head,tail,str)
local attr = marked[str]
local last = tail
if last[a_marked] == attr then
local first = last
while true do
local prev = first.prev
if prev and prev[a_marked] == attr then
local id = prev.id
if id == localpar_code then
break
else
first = prev
end
else
break
end
end
return first, last
end
end
local actions = {
remove = function(specification)
local list = texnest[texnest.ptr]
if list then
local head = list.head
local tail = list.tail
local first, last = pickup(head,tail,specification.mark)
if first then
if first == head then
list.head = nil
list.tail = nil
else
local prev = first.prev
list.tail = prev
prev.next = nil
end
flush_list(first)
end
end
end,
}
local function pickupmarkedcontent(specification)
local action = actions[specification.action or "remove"]
if action then
action(specification)
end
end
local function markcontent(str)
local currentmarked = marked[str or v_all]
if not currentmarked then
lastmarked = lastmarked + 1
currentmarked = lastmarked
marked[str] = currentmarked
end
settexattribute(a_marked,currentmarked)
end
interfaces.implement {
name = "pickuppunctuation",
actions = pickuppunctuation,
arguments = {
{
{ "action" }
}
}
}
interfaces.implement {
name = "pickupmarkedcontent",
actions = pickupmarkedcontent,
arguments = {
{
{ "action" },
{ "mark" }
}
}
}
interfaces.implement {
name = "markcontent",
actions = markcontent,
arguments = "string",
}
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