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if not modules then modules = { } end modules ['page-lin'] = {
version = 1.001,
comment = "companion to page-lin.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- experimental
local format = string.format
local texsprint, texbox = tex.sprint, tex.box
local ctxcatcodes = tex.ctxcatcodes
nodes = nodes or { }
nodes.lines = nodes.lines or { }
nodes.lines.data = nodes.lines.data or { } -- start step tag
-- if there is demand for it, we can support multiple numbering streams
-- and use more than one attibute
local hlist, vlist, whatsit = node.id('hlist'), node.id('vlist'), node.id('whatsit')
local display_math = attributes.private('display-math')
local line_number = attributes.private('line-number')
local line_reference = attributes.private('line-reference')
local current_list = { }
local cross_references = { }
local chunksize = 250 -- not used in boxed
local has_attribute = node.has_attribute
local traverse_id = node.traverse_id
local traverse = node.traverse
local copy_node = node.copy
local data = nodes.lines.data
nodes.lines.scratchbox = nodes.lines.scratchbox or 0
-- cross referencing
function nodes.lines.number(n)
local cr = cross_references[n] or 0
cross_references[n] = nil
return cr
end
local function resolve(n,m)
while n do
local id = n.id
if id == whatsit then
local a = has_attribute(n,line_reference)
if a then
cross_references[a] = m
end
elseif id == hlist or id == vlist then
resolve(n.list,m)
end
n = n.next
end
end
-- boxed variant
nodes.lines.boxed = { }
function nodes.lines.boxed.register(configuration)
data[#data+1] = configuration
return #data
end
function nodes.lines.boxed.setup(n,configuration)
local d = data[n]
if d then
for k,v in pairs(configuration) do d[k] = v end
else
data[n] = configuration
end
return n
end
local leftskip = nodes.leftskip
local function check_number(n,a) -- move inline
local d = data[a]
if d then
local s = d.start
current_list[#current_list+1] = { n, s }
if d.start % d.step == 0 then
texsprint(ctxcatcodes, format("\\makenumber{%s}{%s}{%s}{%s}{%s}\\endgraf", d.tag or "", s, n.shift, n.width, leftskip(n.list)))
else
texsprint(ctxcatcodes, "\\skipnumber\\endgraf")
end
d.start = s + 1 -- (d.step or 1)
end
end
function nodes.lines.boxed.stage_one(n)
current_list = { }
local head = texbox[n]
if head then
local list = head.list
--~ while list.id == vlist and not list.next do
--~ list = list.list
--~ end
for n in traverse_id(hlist,list) do -- attr test here and quit as soon as zero found
if n.height == 0 and n.depth == 0 then
-- skip funny hlists
else
local a = has_attribute(n.list,line_number)
if a and a > 0 then
if has_attribute(n,display_math) then
if nodes.is_display_math(n) then
check_number(n,a)
end
else
if node.first_character(n.list) then
check_number(n,a)
end
end
end
end
end
end
end
function nodes.lines.boxed.stage_two(n,m)
if #current_list > 0 then
m = m or nodes.lines.scratchbox
local t, i = { }, 0
for l in traverse_id(hlist,texbox[m].list) do
t[#t+1] = copy_node(l)
end
for j=1,#current_list do
local l = current_list[j]
local n, m = l[1], l[2]
i = i + 1
t[i].next = n.list
n.list = t[i]
resolve(n,m)
end
end
end
-- flow variant
--
-- it's too hard to make this one robust, so for the moment it's not
-- available; todo: line refs
if false then
nodes.lines.flowed = { }
function nodes.lines.flowed.prepare(tag)
for i=1,#data do -- ??
texsprint(ctxcatcodes,format("\\ctxlua{nodes.lines.flowed.prepare_a(%s)}\\ctxlua{nodes.lines.flowed.prepare_b(%s)}",i,i))
end
end
function nodes.lines.flowed.prepare_a(i)
local d = data[i]
local p = d.present
if p and p < chunksize then
local b = nodes.lines.scratchbox
texsprint(ctxcatcodes, format("{\\forgetall\\global\\setbox%s=\\vbox{\\unvbox%s\\relax\\offinterlineskip", b, b))
while p < chunksize do
texsprint(ctxcatcodes, format("\\mkmaketextlinenumber{%s}{%s}\\endgraf",d.start,1))
p = p + 1
d.start = d.start + d.step
end
d.present = p
texsprint(ctxcatcodes, "}}")
end
end
function nodes.lines.flowed.prepare_b(i)
local d = data[i]
local b = nodes.lines.scratchbox
local l = texbox[b]
if l then
l = l.list
local n = d.numbers
while l do
if l.id == hlist then
local m = copy_node(l)
m.next = nil
if n then
n.next = m
else
d.numbers = m
end
n = m
end
l = l.next
end
end
tex.box[b] = nil
end
function nodes.lines.flowed.cleanup(i)
if i then
node.flush_list(data[i].numbers)
else
for i=1,#data do
node.flush_list(data[i].numbers)
end
end
end
local function check_number(n,a)
local d = data[a]
if d then
local m = d.numbers
if m then
d.numbers = m.next
m.next = n.list
n.list = m
d.present = d.present - 1
end
end
end
function nodes.lines.flowed.apply(head)
for n in node.traverse(head) do
local id = n.id
if id == hlist then
if n.height == 0 and n.depth == 0 then
-- skip funny hlists
else
local a = has_attribute(n,line_number)
if a and a > 0 then
if has_attribute(n,display_math) then
if nodes.is_display_math(n) then
check_number(n,a)
end
else
check_number(n,a)
end
end
end
end
end
return head, true
end
end
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