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
|
if not modules then modules = { } end modules ['typo-spa'] = {
version = 1.001,
comment = "companion to typo-spa.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local utf = unicode.utf8
local next, type = next, type
local utfchar = utf.char
local trace_hspacing = false trackers.register("nodes.hspacing", function(v) trace_hspacing = v end)
local has_attribute = node.has_attribute
local unset_attribute = node.unset_attribute
local insert_node_before = node.insert_before
local insert_node_after = node.insert_after
local remove_node = nodes.remove
local make_penalty_node = nodes.penalty
local make_glue_node = nodes.glue
local glyph = node.id("glyph")
local fontdata = fonts.ids
spacings = spacings or { }
spacings.mapping = spacings.mapping or { }
spacings.enabled = false
spacings.attribute = attributes.private("spacing")
storage.register("spacings/mapping", spacings.mapping, "spacings.mapping")
function spacings.setspacing(id,char,left,right,alternative)
local mapping = spacings.mapping[id]
if not mapping then
mapping = { }
spacings.mapping[id] = mapping
end
local map = mapping[char]
if not map then
map = { }
mapping[char] = map
end
map.left, map.right, map.alternative = left, right, alternative
end
function spacings.process(namespace,attribute,head)
local done, mapping = false, spacings.mapping
local start = head
-- head is always begin of par (whatsit), so we have at least two prev nodes
-- penalty followed by glue
while start do
if start.id == glyph then
local attr = has_attribute(start,attribute)
if attr and attr > 0 then
local map = mapping[attr]
if map then
map = map[start.char]
unset_attribute(start,attribute)
if map then
local left, right, alternative = map.left, map.right, map.alternative
local quad = fontdata[start.font].parameters.quad
local prev = start.prev
if left and left ~= 0 and prev then
local ok = false
if alternative == 1 then
local somespace = nodes.somespace(prev,true)
if somespace then
local prevprev = prev.prev
local somepenalty = nodes.somepenalty(prevprev,10000)
if somepenalty then
if trace_hspacing then
logs.report("spacing","removing penalty and space before %s", utfchar(start.char))
end
head, _ = remove_node(head,prev,true)
head, _ = remove_node(head,prevprev,true)
else
local somespace = nodes.somespace(prev,true)
if somespace then
if trace_hspacing then
logs.report("spacing","removing space before %s", utfchar(start.char))
end
head, _ = remove_node(head,prev,true)
end
end
end
ok = true
else
ok = not (nodes.somespace(prev,true) and nodes.somepenalty(prev.prev,true)) or nodes.somespace(prev,true)
end
if ok then
if trace_hspacing then
logs.report("spacing","inserting penalty and space before %s", utfchar(start.char))
end
insert_node_before(head,start,make_penalty_node(10000))
insert_node_before(head,start,make_glue_node(tex.scale(quad,left)))
done = true
end
end
local next = start.next
if right and right ~= 0 and next then
local ok = false
if alternative == 1 then
local somepenalty = nodes.somepenalty(next,10000)
if somepenalty then
local nextnext = next.next
local somespace = nodes.somespace(nextnext,true)
if somespace then
if trace_hspacing then
logs.report("spacing","removing penalty and space after %s", utfchar(start.char))
end
head, _ = remove_node(head,next,true)
head, _ = remove_node(head,nextnext,true)
end
else
local somespace = nodes.somespace(next,true)
if somespace then
if trace_hspacing then
logs.report("spacing","removing space after %s", utfchar(start.char))
end
head, _ = remove_node(head,next,true)
end
end
ok = true
else
ok = not (nodes.somepenalty(next,10000) and nodes.somespace(next.next,true)) or nodes.somespace(next,true)
end
if ok then
if trace_hspacing then
logs.report("spacing","inserting penalty and space after %s", utfchar(start.char))
end
insert_node_after(head,start,make_glue_node(tex.scale(quad,right)))
insert_node_after(head,start,make_penalty_node(10000))
done = true
end
end
end
end
end
end
start = start.next
end
return head, done
end
lists.handle_spacing = nodes.install_attribute_handler {
name = "spacing",
namespace = spacings,
processor = spacings.process,
}
|