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if not modules then modules = { } end modules ['spac-brk'] = {
version = 1.001,
comment = "companion to spac-brk.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next, type, tonumber, tostring = next, type, tonumber, tostring
local settings_to_array = utilities.parsers.settings_to_array
local settings_to_hash = utilities.parsers.settings_to_hash
local nuts = nodes.nuts
local tonut = nodes.tonut
local newrule = nuts.pool.virtualrule
local insertbefore = nuts.insertbefore
local insertafter = nuts.insertafter
local hpack_string = nuts.typesetters.tohpack
local getwidth = nuts.getwidth
local getid = nuts.getid
local getprev = nuts.getprev
local getnext = nuts.getnext
local setwhd = nuts.setwhd
local getlist = nuts.getlist
local setoffsets = nuts.setoffsets
local setcolor = nodes.tracers.colors.set
local settransparency = nodes.tracers.transparencies.set
local texgetnest = tex.getnest
local texgetcount = tex.getcount
local nodecodes = nodes.nodecodes
local penalty_code = nodecodes.penalty
local glue_code = nodecodes.glue
local disc_code = nodecodes.disc
local math_code = nodecodes.math
local breakcodes = tex.breakcodes
local registercallback = callback.register
local c_tracinglousiness = tex.iscount("tracinglousiness")
local alignments = { }
typesetters.alignments = alignments
typesetters = typesetters or { }
local breakpoints = typesetters.breakpoints or { }
typesetters.breakpoints = breakpoints
local width = 65536 / 2
local height = 9 * 65536
local depth = 3 * 65536
local xoffset = 1 * 65536
local yoffset = -3 * 65536
local serial = false
local usedfont = false
local nestlevel = false
local overload = false
local order = 0
local report = logs.reporter("linebreaks")
local actions = {
[breakcodes.initialize] = function()
if texgetnest("ptr") == nestlevel then
usedfont = nodes.visualizers.getusedfont()
serial = false
order = order + 1
end
end,
[breakcodes.start] = function(pass)
if texgetnest("ptr") == nestlevel then
if pass == 2 then
serial = { }
end
end
end,
[breakcodes.report] = function(pass,currentserial,previousserial,line,kind,class,demerits,breakpoint,short,glue)
if serial and breakpoint and texgetnest("ptr") == nestlevel then
local s = {
serial = currentserial,
demerits = demerits,
breakpoint = breakpoint,
}
serial[currentserial] = s
local found = overload and overload[currentserial]
if found then
report("pass %i, overloading serial %i.%i demerits from %i to %i",2,order,currentserial,demerits,found)
return found
end
end
return demerits
end,
[breakcodes.collect] = function()
if serial and texgetnest("ptr") == nestlevel and texgetcount(c_tracinglousiness) >= 1 then
for currentserial=1,#serial do
local data = serial[currentserial]
local breakpoint = data.breakpoint
local current = tonut(breakpoint)
while current do
local id = getid(current)
if id == penalty_code or id == glue_code or id == kern_code or id == math_code then
current = getprev(current)
else
break
end
end
if current then
local rule = newrule(width,height,depth,currentserial)
data.rule = rule
insertafter(current,current,rule)
end
end
end
end,
[breakcodes.wrapup] = function()
if serial and texgetnest("ptr") == nestlevel then
local n = #serial
local trace = texgetcount(c_tracinglousiness)
if trace >= 2 then
report("%i demerits in set %i",n,order)
end
for currentserial=1,n do
local data = serial[currentserial]
local demerits = data.demerits
if trace >= 1 then
local rule = data.rule
if rule then
local tag = tostring(order).."."..tostring(currentserial)
local text = hpack_string(tag,usedfont)
local size = getwidth(text)
setwhd(text,0,0,0)
setoffsets(text,-size-xoffset,yoffset)
insertafter(rule,rule,text)
end
end
serial[currentserial] = demerits
if trace >= 2 then
report("% 4i : %8i",currentserial,demerits)
end
end
overload = false
registercallback("show_break")
end
end,
}
local function action(what,...)
local action = actions[what]
if action then
return action(...)
end
end
local function show(str)
nestlevel = texgetnest("ptr")
if str and str ~= "" then
if type(str) == "table" then
overload = str
else
overload = settings_to_hash(str)
for k, v in next, overload do
overload[tonumber(k)] = tonumber(v) or -1
end
end
else
overload = false
end
registercallback("show_break", action)
end
local function last()
return serial or { }
end
typesetters.breakpoints.show = show
typesetters.breakpoints.last = last
-- interface
local context = context
local scaninteger = tokens.scanners.integer
local function feedback()
local l = last()
local n = #l
if n > 0 then
local t = { n }
local m = 1
for i=1,#l do
m = m + 1 ; t[m] = i
m = m + 1 ; t[m] = l[i]
end
context("% t",t)
end
end
interfaces.implement {
name = "lousiness",
public = true,
protected = true,
usage = "value",
actions = function(what)
if what == "value" then
feedback()
else
local n = scaninteger()
local t = { }
for i=1,n do
t[scaninteger()] = scaninteger()
end
show(t)
end
end,
}
interfaces.implement {
name = "silliness",
public = true,
protected = true,
usage = "value",
actions = function(what)
if what == "value" then
feedback()
else
show { [scaninteger()] = 0 }
end
end,
}
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