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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 nuts = nodes.nuts
local tonut = nuts.tonut
local getfield = nuts.getfield
local setfield = nuts.setfield
local getlist = nuts.getlist
local getattr = nuts.getattr
local setattr = nuts.setattr
local setlist = nuts.setlist
local traverse_id = nuts.traverse_id
local get_list_dimensions = nuts.dimensions
local linked_nodes = nuts.linked
local copy_node = nuts.copy
local tracedrule = nodes.tracers.pool.nuts.rule
local nodepool = nuts.pool
local new_rule = nodepool.rule
local new_hlist = nodepool.hlist
local new_glue = nodepool.glue
local new_kern = nodepool.kern
local hlist_code = nodes.nodecodes.hlist
local texsetattribute = 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")
texsetattribute(a_justification,n or 1)
function typesetters.checkers.set(n)
texsetattribute(a_justification,n or 1)
end
end
local function reset()
texsetattribute(a_justification,unsetvalue)
end
checkers.set = set
checkers.reset = reset
interfaces.implement {
name = "showjustification",
actions = set
}
trackers.register("visualizers.justification", function(v)
if v then
set(1)
else
reset()
end
end)
function checkers.handler(head)
for current in traverse_id(hlist_code,tonut(head)) do
if getattr(current,a_justification) == 1 then
setattr(current,a_justification,0) -- kind of reset
local width = getfield(current,"width")
if width > 0 then
local list = getlist(current)
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 = tracedrule(delta,naturalheight,naturaldepth,getfield(list,"glue_set") == 1 and "trace:dr" or "trace:db")
setfield(current,"list",linked_nodes(list,new_hlist(rule)))
elseif delta <= min_threshold then
local alignstate = getattr(list,a_alignstate)
if alignstate == 1 then
local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dc")
setfield(current,"list",linked_nodes(new_hlist(rule),list))
elseif alignstate == 2 then
local lrule = tracedrule(-delta/2,naturalheight,naturaldepth,"trace:dy")
local rrule = copy_node(lrule)
setfield(current,"list",linked_nodes(new_hlist(lrule),list,new_kern(delta/2),new_hlist(rrule)))
elseif alignstate == 3 then
local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dm")
setfield(current,"list",linked_nodes(list,new_kern(delta),new_hlist(rule)))
else
local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dg")
setfield(current,"list",linked_nodes(list,new_kern(delta),new_hlist(rule)))
end
end
end
end
end
end
return head
end
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