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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
if not modules then modules = { } end modules ['typo-lbx'] = {
version = 1.001,
optimize = true,
comment = "companion to typo-lbx.mkxl",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tostring = tostring
local nuts = nodes.nuts
local left_box_code = nodes.listcodes.left
local right_box_code = nodes.listcodes.right
local hlist_code = nodes.nodecodes.hlist
local getlist = nuts.getlist
local getprev = nuts.getprev
local getnext = nuts.getnext
local getattribute = nuts.getattribute
local gettail = nuts.tail
local getwidth = nuts.getwidth
local setlist = nuts.setlist
local setoffsets = nuts.setoffsets
local flushlist = nuts.flushlist
local takebox = nuts.takebox
local setbox = nuts.setbox
local copynode = nuts.copynode
local rangedimensions = nuts.rangedimensions
local traverse_list = nuts.traversers.list
local expandmacro = token.expandmacro
local dimension_value = tokens.values.dimension
local integer_value = tokens.values.integer
local implement = interfaces.implement
typesetters = typesetters or { }
local typesetters = typesetters
typesetters.localboxes = typesetters.localboxes or { }
local localboxes = typesetters.localboxes
local a_localboxes = attributes.private("localboxes")
local starttiming = statistics.starttiming
local stoptiming = statistics.stoptiming
do
local lb_attribute = 0
local lb_linenumber = 0
local lb_width = 0
local lb_offset = 0
local lb_leftskip = 0
local lb_rightskip = 0
local lb_lefthang = 0
local lb_righthang = 0
local lb_indent = 0
local lb_parfillleftskip = 0
local lb_parfillrightskip = 0
local lb_overshoot = 0
implement { name = "localboxattribute", public = true, usage = "value", actions = function() return integer_value, lb_attribute end }
implement { name = "localboxlinenumber", public = true, usage = "value", actions = function() return integer_value, lb_linenumber end }
implement { name = "localboxwidth", public = true, usage = "value", actions = function() return dimension_value, lb_width end }
implement { name = "localboxoffset", public = true, usage = "value", actions = function() return dimension_value, lb_offset end }
implement { name = "localboxleftskip", public = true, usage = "value", actions = function() return dimension_value, lb_leftskip end }
implement { name = "localboxrightskip", public = true, usage = "value", actions = function() return dimension_value, lb_rightskip end }
implement { name = "localboxlefthang", public = true, usage = "value", actions = function() return dimension_value, lb_lefthang end }
implement { name = "localboxrighthang", public = true, usage = "value", actions = function() return dimension_value, lb_righthang end }
implement { name = "localboxindent", public = true, usage = "value", actions = function() return dimension_value, lb_indent end }
implement { name = "localboxparfillleftskip", public = true, usage = "value", actions = function() return dimension_value, lb_parfillleftskip end }
implement { name = "localboxparfillrightskip", public = true, usage = "value", actions = function() return dimension_value, lb_parfillrightskip end }
implement { name = "localboxovershoot", public = true, usage = "value", actions = function() return dimension_value, lb_overshoot end }
local function action(current,where)
-- We can have nested leftboxes!
local l = getlist(current)
setlist(current)
local h = copynode(current)
setlist(h,l)
setbox("localboxcontentbox",h)
expandmacro("localboxcommand") -- no longer pass arguments
local b = takebox("localboxcontentbox")
setlist(current,b)
if where == "left" then
local w = getwidth(b)
setoffsets(b,lb_width - lb_offset - w)
else
setoffsets(b,lb_offset - lb_width)
end
end
local function processleftbox(box,width)
local list = getlist(box)
if not width then
width = 0
end
for current, id, subtype in traverse_list, list do
if id == hlist_code then
local a = getattribute(current,a_localboxes)
if a then
lb_attribute = a
lb_width = width + rangedimensions(box,list,getprev(current))
action(current,"left")
end
if subtype == left_box_code then
processleftbox(current,width + rangedimensions(box,list,getprev(current)))
end
end
end
end
local function processrightbox(box,width)
local list = getlist(box)
local tail = gettail(list)
if not width then
width = 0
end
for current, id, subtype in traverse_list, list do
if id == hlist_code then
local a = getattribute(current,a_localboxes)
if a then
lb_attribute = a
lb_width = width + rangedimensions(box,list,getnext(current),tail)
action(current,"right")
end
if subtype == right_box_code then
processrightbox(current,width + rangedimensions(box,getnext(current),tail))
end
end
end
end
local function processlocalboxes(line, leftbox, rightbox, linenumber, leftskip, rightskip, lefthang, righthang, indent, parfillleftskip, parfillrightskip, overshoot)
--
lb_attribute = 0
lb_linenumber = linenumber
lb_width = 0
-- lb_offset = 0
lb_leftskip = leftskip
lb_rightskip = rightskip
lb_lefthang = lefthang
lb_righthang = righthang
lb_indent = indent
lb_parfillleftskip = parfillleftskip
lb_parfillrightskip = parfillrightskip
lb_overshoot = overshoot
--
-- for now we always anchor
--
if leftbox then
lb_offset = leftskip + lefthang + indent + parfillleftskip + getwidth(leftbox)
processleftbox(leftbox)
end
if rightbox then
lb_offset = rightskip + righthang + parfillrightskip + getwidth(rightbox) - overshoot
processrightbox(rightbox)
end
end
typesetters.localboxes.handler = processlocalboxes
end
local localboxactions = nodes.tasks.actions("localboxes")
function builders.local_box_filter(...)
starttiming(builders)
localboxactions(...)
stoptiming(builders)
end
-- we register the function elsewhere
callbacks.register("local_box_filter", builders.local_box_filter, "process local boxes")
|
