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if not modules then modules = { } end modules ['typo-lin'] = {
version = 1.001,
comment = "companion to typo-lin.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- can become typo-par or so
local trace_anchors = false trackers.register("paragraphs.anchors", function(v) trace_anchors = v end)
local nuts = nodes.nuts
local nodecodes = nodes.nodecodes
local gluecodes = nodes.gluecodes
local listcodes = nodes.listcodes
local whatcodes = nodes.whatsitcodes
local hlist_code = nodecodes.hlist
local glue_code = nodecodes.glue
local whatsit_code = nodecodes.whatsit
local line_code = listcodes.line
local leftskip_code = gluecodes.leftskip
local rightskip_code = gluecodes.rightskip
local textdir_code = whatcodes.textdir
local localpar_code = whatcodes.localpar
local tonut = nodes.tonut
local tonode = nodes.tonode
local traverse_id = nuts.traverse_id
local insert_before = nuts.insert_before
local insert_after = nuts.insert_after
local findtail = nuts.tail
local remove_node = nuts.remove
local hpack_nodes = nuts.hpack
local getsubtype = nuts.getsubtype
local getlist = nuts.getlist
local getid = nuts.getid
local getnext = nuts.getnext
local getfield = nuts.getfield
local setfield = nuts.setfield
local setprop = nuts.setprop
local getprop = nuts.getprop
local nodepool = nuts.pool
local new_glue = nodepool.glue
local new_kern = nodepool.kern
local new_leftskip = nodepool.leftskip
local new_rightskip = nodepool.rightskip
local new_hlist = nodepool.hlist
local new_vlist = nodepool.vlist
local new_rule = nodepool.rule
local texgetcount = tex.getcount
local paragraphs = { }
typesetters.paragraphs = paragraphs
-- also strip disc
-- We only need to normalize the left side because when we mess around
-- we keep the page stream order (and adding content to the right of the
-- line is a no-go for tagged etc. For the same reason we don't use two
-- left anchors (each side fo leftskip) because there can be stretch. But,
-- maybe there are good reasons for having just that anchor (mostly for
-- educational purposes I guess.)
-- At this stage the localpar node is no longer of any use so we remove
-- it (each line has the direction attached). We might at some point also
-- strip the disc nodes as they no longer serve a purpose but that can
-- better be a helper. Anchoring left has advantage of keeping page stream.
-- indent : hlist type 3
-- hangindent : shift and width
-- new_glue(0,65536,65536,2,2) -- hss (or skip -width etc)
-- -- rightskip checking
--
-- local tail = findtail(head)
-- local rightskip = nil
-- local right = new_hlist()
-- local id = getid(tail)
-- if id == glue_code then
-- local subtype = getsubtype(tail)
-- if subtype == rightskip_code then
-- rightskip = tail
-- end
-- end
-- if not rightskip then
-- print("inserting rightskip")
-- rightskip = new_rightskip()
-- insert_after(head,tail,rightskip)
-- tail = rightskip
-- end
-- insert_after(head,tail,right)
--
-- tail = tail,
-- right = {
-- pack = right,
-- head = nil,
-- tail = nil,
-- }
-- todo: see if we can hook into box in buildpagefilter .. saves traverse
function paragraphs.normalize(head,...)
if texgetcount("pagebodymode") > 0 then
-- can be an option, maybe we need a proper state in lua itself
return head, false
end
for line in traverse_id(hlist_code,tonut(head)) do
if getsubtype(line) == line_code then
local head = getlist(line)
local leftskip = nil
local anchor = new_hlist()
local id = getid(head)
local shift = getfield(line,"shift")
local width = getfield(line,"width")
local hsize = tex.hsize
local reverse = getfield(line,"dir") == "TRT" or false
if id == glue_code then
local subtype = getsubtype(head)
if subtype == leftskip_code then
leftskip = head
end
local next = getnext(head)
if next and getsubtype(next) == localpar_code then
head = remove_node(head,next,true)
end
elseif id == whatsit_code then
if getsubtype(head) == localpar_code then
head = remove_node(head,head,true)
end
end
head = insert_before(head,head,anchor)
shift = shift + width - hsize
if reverse then
head = insert_before(head,head,new_kern(shift))
insert_after(head,anchor,new_kern(-shift))
else
head = insert_before(head,head,new_kern(-shift))
end
if not leftskip then
head = insert_before(head,head,new_leftskip(0))
end
setfield(anchor,"attr",getfield(line,"attr"))
-- print(nodes.idstostring(head))
-- print("NORMALIZE",line)
setfield(line,"list",head)
setprop(line,"line",{
reverse = reverse,
width = width,
hsize = hsize,
shift = shift,
head = head,
anchor = {
pack = anchor,
head = nil,
tail = nil,
},
})
end
end
return head, true
end
function paragraphs.addtoline(n,list)
local line = getprop(n,"line")
if line then
if trace_anchors and not line.traced then
line.traced = true
local rule = new_rule(2*65536,2*65536,1*65536)
local list = insert_before(rule,rule,new_kern(-1*65536))
paragraphs.addtoline(n,list)
end
local list = tonut(list)
local what = line.anchor
local tail = what.tail
local blob = new_hlist(list)
if tail then
insert_after(what.head,what.tail,blob)
else
setfield(what.pack,"list",blob)
what.head = blob
end
what.tail = blob
end
end
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