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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 trace_numbers = false trackers.register("lines.numbers", function(v) trace_numbers = v end)
local report_lines = logs.new("lines")
local format = string.format
local texsprint, texwrite, texbox = tex.sprint, tex.write, tex.box
local ctxcatcodes = tex.ctxcatcodes
local variables = interfaces.variables
nodes = nodes or { }
nodes.lines = nodes.lines or { }
nodes.lines.data = nodes.lines.data or { } -- start step tag
storage.register("lines/data", nodes.lines.data, "nodes.lines.data")
-- 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 hpack_node = node.hpack
local insert_node_after = node.insert_after
local insert_node_before = node.insert_before
local whatsit = node.id("whatsit")
local data = nodes.lines.data
local last = #data
nodes.lines.scratchbox = nodes.lines.scratchbox or 0
-- cross referencing
function nodes.lines.number(n)
n = tonumber(n)
local cr = cross_references[n] or 0
cross_references[n] = nil
return cr
end
local function resolve(n,m) -- we can now check the 'line' flag (todo)
while n do
local id = n.id
if id == whatsit then -- why whatsit
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
function nodes.lines.finalize(t)
local getnumber = nodes.lines.number
for _,p in next, t do
for _,r in next, p do
if r.metadata.kind == "line" then
local e = r.entries
local u = r.userdata
e.linenumber = getnumber(e.text or 0) -- we can nil e.text
e.conversion = u and u.conversion
r.userdata = nil -- hack
end
end
end
end
local filters = jobreferences.filters
local helpers = structure.helpers
jobreferences.registerfinalizer(nodes.lines.finalize)
filters.line = filters.line or { }
function filters.line.default(data)
-- helpers.title(data.entries.linenumber or "?",data.metadata)
texsprint(ctxcatcodes,format("\\convertnumber{%s}{%s}",data.entries.conversion or "numbers",data.entries.linenumber or "0"))
end
function filters.line.page(data,prefixspec,pagespec) -- redundant
helpers.prefixpage(data,prefixspec,pagespec)
end
function filters.line.linenumber(data) -- raw
texwrite(data.entries.linenumber or "0")
end
-- boxed variant, todo: use number mechanism
nodes.lines.boxed = { }
-- todo: cache setups, and free id no longer used
-- use interfaces.cachesetup(t)
function nodes.lines.boxed.register(configuration)
last = last + 1
data[last] = configuration
if trace_numbers then
report_lines("registering setup %s",last)
end
return last
end
function nodes.lines.boxed.setup(n,configuration)
local d = data[n]
if d then
if trace_numbers then
report_lines("updating setup %s",n)
end
for k,v in next, configuration do
d[k] = v
end
else
if trace_numbers then
report_lines("registering setup %s (br)",n)
end
data[n] = configuration
end
return n
end
local the_left_margin = nodes.the_left_margin
local function check_number(n,a,skip) -- move inline
local d = data[a]
if d then
local s = d.start or 1
current_list[#current_list+1] = { n, s }
if not skip and s % d.step == 0 then
local tag = d.tag or ""
texsprint(ctxcatcodes, format("\\makenumber{%s}{%s}{%s}{%s}{%s}{%s}\\endgraf",tag,s,n.shift,n.width,the_left_margin(n.list),n.dir))
if trace_numbers then
report_lines("making number %s for setup %s: %s (%s)",#current_list,a,s,d.continue or "no")
end
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
local last_a, skip = nil, false
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 last_a ~= a then
if data[a].method == variables.next then
skip = true
end
last_a = a
end
if has_attribute(n,display_math) then
if nodes.is_display_math(n) then
check_number(n,a,skip)
end
else
-- the following test fails somehow (change in luatex?)
-- if node.first_character(n.list) then
check_number(n,a,skip)
-- end
end
skip = false
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 i=1,#current_list do
local li = current_list[i]
local n, m, ti = li[1], li[2], t[i]
ti.next, n.list = n.list, ti
resolve(n,m)
end
end
end
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