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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
if not modules then modules = { } end modules ['lang-dis'] = {
version = 1.001,
comment = "companion to lang-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local concat = table.concat
local nodes = nodes
local tasks = nodes.tasks
local nuts = nodes.nuts
local nodepool = nuts.pool
local tonode = nuts.tonode
local tonut = nuts.tonut
local getfield = nuts.getfield
local setfield = nuts.setfield
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getfont = nuts.getfont
local getattr = nuts.getattr
local getsubtype = nuts.getsubtype
local getchar = nuts.getchar
local copy_node = nuts.copy
local free_node = nuts.free
local remove_node = nuts.remove
local traverse_id = nuts.traverse_id
local traverse_nodes = nuts.traverse
local nodecodes = nodes.nodecodes
local disccodes = nodes.disccodes
local disc_code = nodecodes.disc
local glyph_code = nodecodes.glyph
local discretionary_code = disccodes.discretionary
local a_visualize = attributes.private("visualizediscretionary")
local setattribute = tex.setattribute
local getlanguagedata = languages.getdata
local expanders = {
[disccodes.discretionary] = function(d,template)
-- \discretionary
return template
end,
[disccodes.explicit] = function(d,template)
-- \-
local pre = getfield(d,"pre")
if pre and getid(pre) == glyph_code and getchar(pre) <= 0 then
setfield(d,"pre",nil)
end
local post = getfield(d,"post")
if post and getid(post) == glyph_code and getchar(post) <= 0 then
setfield(d,"post",nil)
end
-- setfield(d,"subtype",discretionary_code) -- to be checked
return template
end,
[disccodes.automatic] = function(d,template)
-- following a - : the pre and post chars are already appended and set
-- so we have pre=preex and post=postex .. however, the previous
-- hyphen is already injected ... downside: the font handler sees this
-- so this is another argument for doing a hyphenation pass in context
if getfield(d,"pre") then
-- we have a preex characters and want that one to replace the
-- character in front which is the trigger
if not template then
-- can there be font kerns already?
template = getprev(d)
if template and getid(template) ~= glyph_code then
template = getnext(d)
if template and getid(template) ~= glyph_code then
template = nil
end
end
end
if template then
local pseudohead = getprev(template)
if pseudohead then
while template ~= d do
pseudohead, template, removed = remove_node(pseudohead,template)
setfield(d,"replace",removed)
-- break ?
end
else
-- can't happen
end
setfield(d,"subtype",discretionary_code)
else
-- print("lone regular discretionary ignored")
end
end
return template
end,
[disccodes.regular] = function(d,template)
-- simple
if not template then
-- can there be font kerns already?
template = getprev(d)
if template and getid(template) ~= glyph_code then
template = getnext(d)
if template and getid(template) ~= glyph_code then
template = nil
end
end
end
if template then
local language = template and getfield(template,"lang")
local data = getlanguagedata(language)
local prechar = data.prehyphenchar
local postchar = data.posthyphenchar
if prechar and prechar > 0 then
local c = copy_node(template)
setfield(c,"char",prechar)
setfield(d,"pre",c)
end
if postchar and postchar > 0 then
local c = copy_node(template)
setfield(c,"char",postchar)
setfield(d,"post",c)
end
setfield(d,"subtype",discretionary_code)
else
-- print("lone regular discretionary ignored")
end
return template
end,
[disccodes.first] = function()
-- forget about them
end,
[disccodes.second] = function()
-- forget about them
end,
}
languages.expanders = expanders
function languages.expand(d,template,subtype)
if not subtype then
subtype = getsubtype(d)
end
if subtype ~= discretionary_code then
return expanders[subtype](d,template)
end
end
local setlistcolor = nodes.tracers.colors.setlist
function languages.visualizediscretionaries(head)
for d in traverse_id(disc_code,tonut(head)) do
if getattr(d,a_visualize) then
local pre = getfield(d,"pre")
local post = getfield(d,"post")
local replace = getfield(d,"replace")
if pre then
setlistcolor(pre,"darkred")
end
if post then
setlistcolor(post,"darkgreen")
end
if replace then
setlistcolor(replace,"darkblue")
end
end
end
end
local enabled = false
function languages.showdiscretionaries(v)
if v == false then
setattribute(a_visualize,unsetvalue)
else -- also nil
if not enabled then
nodes.tasks.enableaction("processors","languages.visualizediscretionaries")
enabled = true
end
setattribute(a_visualize,1)
end
end
interfaces.implement {
name = "showdiscretionaries",
actions = languages.showdiscretionaries
}
local toutf = nodes.listtoutf
function languages.serializediscretionary(d) -- will move to tracer
return string.formatters["{%s}{%s}{%s}"](
toutf(getfield(d,"pre")) or "",
toutf(getfield(d,"post")) or "",
toutf(getfield(d,"replace")) or ""
)
end
|
