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
|
if not modules then modules = { } end modules ['spac-chr'] = {
version = 1.001,
comment = "companion to spac-chr.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local byte, lower = string.byte, string.lower
trace_characters = false trackers.register("typesetters.characters", function(v) trace_characters = v end)
report_characters = logs.reporter("typesetting","characters")
local nodes, node = nodes, node
local set_attribute = node.set_attribute
local insert_node_after = node.insert_after
local remove_node = nodes.remove -- ! nodes
local nodepool = nodes.pool
local tasks = nodes.tasks
local new_penalty = nodepool.penalty
local new_glue = nodepool.glue
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local chardata = characters.data
local typesetters = typesetters
local characters = { }
typesetters.characters = characters
local fontparameters = fonts.hashes.parameters
local fontcharacters = fonts.hashes.characters
local a_character = attributes.private("characters")
local c_zero = byte('0')
local c_period = byte('.')
local function inject_quad_space(unicode,head,current,fraction)
local attr = current.attr
if fraction ~= 0 then
fraction = fraction * fontparameters[current.font].quad
end
head, current = insert_node_after(head,current,new_glue(fraction))
current.attr = attr
set_attribute(current,a_character,unicode)
return head, current
end
local function inject_char_space(unicode,head,current,parent)
local attr = current.attr
local char = fontcharacters[current.font][parent]
head, current = insert_node_after(head,current,new_glue(char and char.width or fontparameters[current.font].space))
current.attr = attr
set_attribute(current,a_character,unicode)
return head, current
end
local function inject_nobreak_space(unicode,head,current,space,spacestretch,spaceshrink)
local attr = current.attr
head, current = insert_node_after(head,current,new_penalty(10000))
head, current = insert_node_after(head,current,new_glue(space,spacestretch,spaceshrink))
current.attr = attr
set_attribute(current,a_character,unicode)
return head, current
end
local methods = {
[0x00A0] = function(head,current) -- nobreakspace
local para = fontparameters[current.font]
return inject_nobreak_space(0x00A0,head,current,para.space,para.spacestretch,para.spaceshrink)
end,
[0x2000] = function(head,current) -- enquad
return inject_quad_space(0x2000,head,current,1/2)
end,
[0x2001] = function(head,current) -- emquad
return inject_quad_space(0x2001,head,current,1)
end,
[0x2002] = function(head,current) -- enspace
return inject_quad_space(0x2002,head,current,1/2)
end,
[0x2003] = function(head,current) -- emspace
return inject_quad_space(0x2003,head,current,1)
end,
[0x2004] = function(head,current) -- threeperemspace
return inject_quad_space(0x2004,head,current,1/3)
end,
[0x2005] = function(head,current) -- fourperemspace
return inject_quad_space(0x2005,head,current,1/4)
end,
[0x2006] = function(head,current) -- sixperemspace
return inject_quad_space(0x2006,head,current,1/6)
end,
[0x2007] = function(head,current) -- figurespace
return inject_char_space(0x2007,head,current,c_zero)
end,
[0x2008] = function(head,current) -- punctuationspace
return inject_char_space(0x2008,head,current,c_period)
end,
[0x2009] = function(head,current) -- breakablethinspace
return inject_quad_space(0x2009,head,current,1/8) -- same as next
end,
[0x200A] = function(head,current) -- hairspace
return inject_quad_space(0x200A,head,current,1/8) -- same as previous (todo)
end,
[0x200B] = function(head,current) -- zerowidthspace
return inject_quad_space(0x200B,head,current,0)
end,
[0x202F] = function(head,current) -- narrownobreakspace
return inject_nobreak_space(0x202F,head,current,fontparameters[current.font].space/8)
end,
[0x205F] = function(head,current) -- math thinspace
return inject_nobreak_space(0x205F,head,current,fontparameters[current.font].space/8)
end,
-- [0xFEFF] = function(head,current) -- zerowidthnobreakspace
-- return head, current
-- end,
}
function characters.handler(head)
local current = head
local done = false
while current do
local next = current.next
if current.id == glyph_code then
local char = current.char
local method = methods[char]
if method then
if trace_characters then
report_characters("replacing character U+%04X (%s)",char,lower(chardata[char].description))
end
head = method(head,current)
head = remove_node(head,current,true)
done = true
end
end
current = next
end
return head, done
end
|