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if not modules then modules = { } end modules ['trac-jus'] = {
version = 1.001,
comment = "companion to trac-jus.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local checkers = typesetters.checkers or { }
typesetters.checkers = checkers
----- report_justification = logs.reporter("visualize","justification")
local a_alignstate = attributes.private("alignstate")
local a_justification = attributes.private("justification")
local tracers = nodes.tracers
local setcolor = tracers.colors.set
local settransparency = tracers.transparencies.set
local new_rule = nodes.pool.rule
local new_glue = nodes.pool.glue
local new_kern = nodes.pool.kern
local concat_nodes = nodes.concat
local hpack_nodes = node.hpack
local copy_node = node.copy
local get_list_dimensions = node.dimensions
local hlist_code = nodes.nodecodes.hlist
local tex_set_attribute = tex.setattribute
local unsetvalue = attributes.unsetvalue
local min_threshold = 0
local max_threshold = 0
local function set(n)
nodes.tasks.enableaction("mvlbuilders", "typesetters.checkers.handler")
nodes.tasks.enableaction("vboxbuilders","typesetters.checkers.handler")
tex_set_attribute(a_justification,n or 1)
function typesetters.checkers.set(n)
tex_set_attribute(a_justification,n or 1)
end
end
local function reset()
tex_set_attribute(a_justification,unsetvalue)
end
checkers.set = set
checkers.reset = reset
function commands.showjustification(n)
set(n)
end
trackers.register("visualizers.justification", function(v)
if v then
set(1)
else
reset()
end
end)
function checkers.handler(head)
for current in node.traverse_id(hlist_code,head) do
if current[a_justification] == 1 then
current[a_justification] = 0
local width = current.width
if width > 0 then
local list = current.list
if list then
local naturalwidth, naturalheight, naturaldepth = get_list_dimensions(list)
local delta = naturalwidth - width
if naturalwidth == 0 or delta == 0 then
-- special box
elseif delta >= max_threshold then
local rule = new_rule(delta,naturalheight,naturaldepth)
list = hpack_nodes(list,width,"exactly")
if list.glue_set == 1 then
setcolor(rule,"trace:dr")
settransparency(rule,"trace:dr")
else
setcolor(rule,"trace:db")
settransparency(rule,"trace:db")
end
rule = hpack_nodes(rule)
rule.width = 0
rule.height = 0
rule.depth = 0
current.list = concat_nodes { list, rule }
-- current.list = concat_nodes { list, new_kern(-naturalwidth+width), rule }
elseif delta <= min_threshold then
local alignstate = list[a_alignstate]
if alignstate == 1 then
local rule = new_rule(-delta,naturalheight,naturaldepth)
setcolor(rule,"trace:dc")
settransparency(rule,"trace:dc")
rule = hpack_nodes(rule)
rule.height = 0
rule.depth = 0
rule.width = 0
current.list = nodes.concat { rule, list }
elseif alignstate == 2 then
local rule = new_rule(-delta/2,naturalheight,naturaldepth)
setcolor(rule,"trace:dy")
settransparency(rule,"trace:dy")
rule = hpack_nodes(rule)
rule.width = 0
rule.height = 0
rule.depth = 0
current.list = concat_nodes { copy_node(rule), list, new_kern(delta/2), rule }
elseif alignstate == 3 then
local rule = new_rule(-delta,naturalheight,naturaldepth)
setcolor(rule,"trace:dm")
settransparency(rule,"trace:dm")
rule = hpack_nodes(rule)
rule.height = 0
rule.depth = 0
current.list = concat_nodes { list, new_kern(delta), rule }
else
local rule = new_rule(-delta,naturalheight,naturaldepth)
setcolor(rule,"trace:dg")
settransparency(rule,"trace:dg")
rule = hpack_nodes(rule)
rule.height = 0
rule.depth = 0
rule.width = 0
current.list = concat_nodes { list, new_kern(delta), rule }
end
end
end
end
end
end
return head
end
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