1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
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 tracedrule = tracers.rule
local new_rule = nodes.pool.rule
local new_hlist = nodes.pool.hlist
local new_glue = nodes.pool.glue
local new_kern = nodes.pool.kern
local get_list_dimensions = node.dimensions
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
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 = tracedrule(delta,naturalheight,naturaldepth,list.glue_set == 1 and "trace:dr"or "trace:db")
current.list = list .. new_hlist(rule)
elseif delta <= min_threshold then
local alignstate = list[a_alignstate]
if alignstate == 1 then
local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dc")
current.list = new_hlist(rule) .. list
elseif alignstate == 2 then
local rule = tracedrule(-delta/2,naturalheight,naturaldepth,"trace:dy")
current.list = new_hlist(rule^1) .. list .. new_kern(delta/2) .. new_hlist(rule)
elseif alignstate == 3 then
local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dm")
current.list = list .. new_kern(delta) .. new_hlist(rule)
else
local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dg")
current.list = list .. new_kern(delta) .. new_hlist(rule)
end
end
end
end
end
end
return head
end
|
