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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
|
if not modules then modules = { } end modules ['typo-brk'] = {
version = 1.001,
comment = "companion to typo-brk.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- this code dates from the beginning and is kind of experimental; it
-- will be optimized and improved soon
local next, type, tonumber = next, type, tonumber
local utfbyte, utfchar = utf.byte, utf.char
local format = string.format
local trace_breakpoints = false trackers.register("typesetters.breakpoints", function(v) trace_breakpoints = v end)
local report_breakpoints = logs.reporter("typesetting","breakpoints")
local nodes, node = nodes, node
local settings_to_array = utilities.parsers.settings_to_array
local nuts = nodes.nuts
local tonut = nuts.tonut
local tonode = nuts.tonode
local getnext = nuts.getnext
local getprev = nuts.getprev
local getsubtype = nuts.getsubtype
local getchar = nuts.getchar
local getfont = nuts.getfont
local getid = nuts.getid
local getfield = nuts.getfield
local setfield = nuts.setfield
local getattr = nuts.getattr
local setattr = nuts.setattr
local copy_node = nuts.copy
local copy_nodelist = nuts.copy_list
local free_node = nuts.free
local insert_node_before = nuts.insert_before
local insert_node_after = nuts.insert_after
local remove_node = nuts.remove
local tonodes = nuts.tonodes
local texsetattribute = tex.setattribute
local unsetvalue = attributes.unsetvalue
local nodepool = nuts.pool
local tasks = nodes.tasks
local v_reset = interfaces.variables.reset
local implement = interfaces.implement
local new_penalty = nodepool.penalty
local new_glue = nodepool.glue
local new_disc = nodepool.disc
local nodecodes = nodes.nodecodes
local kerncodes = nodes.kerncodes
local glyph_code = nodecodes.glyph
local kern_code = nodecodes.kern
local kerning_code = kerncodes.kerning
local typesetters = typesetters
typesetters.breakpoints = typesetters.breakpoints or {}
local breakpoints = typesetters.breakpoints
breakpoints.mapping = breakpoints.mapping or { }
breakpoints.numbers = breakpoints.numbers or { }
breakpoints.methods = breakpoints.methods or { }
local methods = breakpoints.methods
local a_breakpoints = attributes.private("breakpoint")
storage.register("typesetters/breakpoints/mapping", breakpoints.mapping, "typesetters.breakpoints.mapping")
local mapping = breakpoints.mapping
local numbers = breakpoints.mapping
for i=1,#mapping do
local m = mapping[i]
numbers[m.name] = m
end
local function insert_break(head,start,before,after)
insert_node_before(head,start,new_penalty(before))
insert_node_before(head,start,new_glue(0))
insert_node_after(head,start,new_glue(0))
insert_node_after(head,start,new_penalty(after))
end
methods[1] = function(head,start)
if getprev(start) and getnext(start) then
insert_break(head,start,10000,0)
end
return head, start
end
methods[2] = function(head,start) -- ( => (-
if getprev(start) and getnext(start) then
local tmp
head, start, tmp = remove_node(head,start)
head, start = insert_node_before(head,start,new_disc())
-- setfield(start,"attr",copy_nodelist(getfield(tmp,"attr"))) -- just a copy will do
setfield(start,"attr",getfield(tmp,"attr"))
setfield(start,"replace",tmp)
local tmp = copy_node(tmp)
local hyphen = copy_node(tmp)
setfield(hyphen,"char",languages.prehyphenchar(getfield(tmp,"lang")))
setfield(tmp,"next",hyphen)
setfield(hyphen,"prev",tmp)
setfield(start,"post",tmp)
insert_break(head,start,10000,10000)
end
return head, start
end
methods[3] = function(head,start) -- ) => -)
if getprev(start) and getnext(start) then
local tmp
head, start, tmp = remove_node(head,start)
head, start = insert_node_before(head,start,new_disc())
-- setfield(start,"attr",copy_nodelist(getfield(tmp,"attr"))) -- just a copy will do
setfield(start,"attr",getfield(tmp,"attr"))
setfield(start,"replace",tmp)
local tmp = copy_node(tmp)
local hyphen = copy_node(tmp)
setfield(hyphen,"char",languages.prehyphenchar(getfield(tmp,"lang")))
setfield(tmp,"prev",hyphen)
setfield(hyphen,"next",tmp)
setfield(start,"pre",hyphen)
insert_break(head,start,10000,10000)
end
return head, start
end
methods[4] = function(head,start) -- - => - - -
if getprev(start) and getnext(start) then
local tmp
head, start, tmp = remove_node(head,start)
head, start = insert_node_before(head,start,new_disc())
-- setfield(start,"attr",copy_nodelist(getfield(tmp,"attr"))) -- just a copy will do
setfield(start,"attr",getfield(tmp,"attr"))
setfield(start,"pre",copy_node(tmp))
setfield(start,"post",copy_node(tmp))
setfield(start,"replace",tmp)
insert_break(head,start,10000,10000)
end
return head, start
end
methods[5] = function(head,start,settings) -- x => p q r
if getprev(start) and getnext(start) then
local tmp
head, start, tmp = remove_node(head,start)
head, start = insert_node_before(head,start,new_disc())
local attr = getfield(tmp,"attr")
local font = getfont(tmp)
local left = settings.left
local right = settings.right
local middle = settings.middle
if left then
setfield(start,"pre",(tonodes(tostring(left),font,attr))) -- was right
end
if right then
setfield(start,"post",(tonodes(tostring(right),font,attr))) -- was left
end
if middle then
setfield(start,"replace",(tonodes(tostring(middle),font,attr)))
end
-- setfield(start,"attr",copy_nodelist(attr)) -- todo: critical only -- just a copy will do
setfield(start,"attr",attr) -- todo: critical only -- just a copy will do
free_node(tmp)
insert_break(head,start,10000,10000)
end
return head, start
end
function breakpoints.handler(head)
head = tonut(head)
local done, numbers = false, languages.numbers
local start, n = head, 0
while start do
local id = getid(start)
if id == glyph_code then
local attr = getattr(start,a_breakpoints)
if attr and attr > 0 then
setattr(start,a_breakpoints,unsetvalue) -- maybe test for subtype > 256 (faster)
-- look ahead and back n chars
local data = mapping[attr]
if data then
local map = data.characters
local cmap = map[getchar(start)]
if cmap then
local lang = getfield(start,"lang")
-- we do a sanity check for language
local smap = lang and lang >= 0 and lang < 0x7FFF and (cmap[numbers[lang]] or cmap[""])
if smap then
if n >= smap.nleft then
local m = smap.nright
local next = getnext(start)
while next do -- gamble on same attribute (not that important actually)
local id = getid(next)
if id == glyph_code then -- gamble on same attribute (not that important actually)
if map[getchar(next)] then
break
elseif m == 1 then
local method = methods[smap.type]
if method then
head, start = method(head,start,smap)
done = true
end
break
else
m = m - 1
next = getnext(next)
end
elseif id == kern_code and getsubtype(next) == kerning_code then
next = getnext(next)
-- ignore intercharacter kerning, will go way
else
-- we can do clever and set n and jump ahead but ... not now
break
end
end
end
n = 0
else
n = n + 1
end
else
n = n + 1
end
else
n = 0
end
else
-- n = n + 1 -- if we want single char handling (|-|) then we will use grouping and then we need this
end
elseif id == kern_code and getsubtype(start) == kerning_code then
-- ignore intercharacter kerning, will go way
else
n = 0
end
start = getnext(start)
end
return tonode(head), done
end
local enabled = false
function breakpoints.define(name)
local data = numbers[name]
if data then
-- error
else
local number = #mapping + 1
local data = {
name = name,
number = number,
characters = { },
}
mapping[number] = data
numbers[name] = data
end
end
function breakpoints.setreplacement(name,char,language,settings)
char = utfbyte(char)
local data = numbers[name]
if data then
local characters = data.characters
local cmap = characters[char]
if not cmap then
cmap = { }
characters[char] = cmap
end
local left, right, middle = settings.left, settings.right, settings.middle
cmap[language or ""] = {
type = tonumber(settings.type) or 1,
nleft = tonumber(settings.nleft) or 1,
nright = tonumber(settings.nright) or 1,
left = left ~= "" and left or nil,
right = right ~= "" and right or nil,
middle = middle ~= "" and middle or nil,
} -- was { type or 1, before or 1, after or 1 }
end
end
function breakpoints.set(n)
if n == v_reset then
n = unsetvalue
else
n = mapping[n]
if not n then
n = unsetvalue
else
if not enabled then
if trace_breakpoints then
report_breakpoints("enabling breakpoints handler")
end
tasks.enableaction("processors","typesetters.breakpoints.handler")
end
n = n.number
end
end
texsetattribute(a_breakpoints,n)
end
-- function breakpoints.enable()
-- tasks.enableaction("processors","typesetters.breakpoints.handler")
-- end
-- interface
implement {
name = "definebreakpoints",
actions = breakpoints.define,
arguments = "string"
}
implement {
name = "definebreakpoint",
actions = breakpoints.setreplacement,
arguments = {
"string",
"string",
"string",
{
{ "type", "integer" },
{ "nleft" },
{ "nright" },
{ "right" },
{ "left" },
{ "middle" },
}
}
}
implement {
name = "setbreakpoints",
actions = breakpoints.set,
arguments = "string"
}
|