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
|
if not modules then modules = { } end modules ['typo-fln'] = {
version = 1.001,
comment = "companion to typo-fln.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- When I ran into the following experimental code again, I figured that it dated
-- from the early days of mkiv, so I updates it a bit to fit into todays context.
-- In the process I might have messed up things. For instance we had a diffent
-- wrapper then using head and tail.
-- todo: only letters (no punctuation)
-- todo: nuts
local trace_firstlines = false trackers.register("typesetters.firstlines", function(v) trace_firstlines = v end)
local report_firstlines = logs.reporter("nodes","firstlines")
typesetters.firstlines = typesetters.firstlines or { }
local firstlines = typesetters.firstlines
local nodes = nodes
local tasks = nodes.tasks
local getbox = nodes.getbox
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local disc_code = nodecodes.disc
local kern_code = nodecodes.kern
local traverse_id = nodes.traverse_id
local free_node_list = nodes.flush_list
local free_node = nodes.flush_node
local copy_node_list = nodes.copy_list
local insert_node_after = nodes.insert_after
local insert_node_before = nodes.insert_before
local hpack_node_list = nodes.hpack
local remove_node = nodes.remove
local nodepool = nodes.pool
local newpenalty = nodepool.penalty
local newkern = nodepool.kern
local tracerrule = nodes.tracers.pool.nodes.rule
local actions = { }
firstlines.actions = actions
local a_firstline = attributes.private('firstline')
local a_color = attributes.private('color')
local a_transparency = attributes.private('transparency')
local a_colorspace = attributes.private('colormodel')
local texsetattribute = tex.setattribute
local unsetvalue = attributes.unsetvalue
local variables = interfaces.variables
local v_default = variables.default
local v_line = variables.line
local v_word = variables.word
----- is_letter = characters.is_letter
----- categories = characters.categories
local settings = nil
function firstlines.set(specification)
settings = specification or { }
tasks.enableaction("processors","typesetters.firstlines.handler")
if trace_firstlines then
report_firstlines("enabling firstlines")
end
texsetattribute(a_firstline,1)
end
commands.setfirstline = firstlines.set
actions[v_line] = function(head,setting)
-- local attribute = fonts.specifiers.contextnumber(setting.feature) -- was experimental
local dynamic = setting.dynamic
local font = setting.font
local noflines = setting.n or 1
local ma = setting.ma or 0
local ca = setting.ca
local ta = setting.ta
local hangafter = tex.hangafter
local hangindent = tex.hangindent
local parindent = tex.parindent
local nofchars = 0
local n = 0
local temp = copy_node_list(head)
local linebreaks = { }
for g in traverse_id(glyph_code,temp) do
if dynamic > 0 then
g[0] = dynamic
end
g.font = font
end
local start = temp
local list = temp
local prev = temp
for i=1,noflines do
local hsize = tex.hsize - tex.leftskip.width - tex.rightskip.width
if i == 1 then
hsize = hsize - parindent
end
if i <= - hangafter then
hsize = hsize - hangindent
end
while start do
local id = start.id
if id == glyph_code then
n = n + 1
elseif id == disc_code then
-- this could be an option
elseif id == kern_code then -- todo: fontkern
-- this could be an option
elseif n > 0 then
local pack = hpack_node_list(copy_node_list(list,start))
if pack.width > hsize then
free_node_list(pack)
list = prev
break
else
linebreaks[i] = n
prev = start
free_node_list(pack)
nofchars = n
end
end
start = start.next
end
if not linebreaks[i] then
linebreaks[i] = n
end
end
local start = head
local n = 0
for i=1,noflines do
local linebreak = linebreaks[i]
while start and n < nofchars do
local id = start.id
if id == glyph_code then -- or id == disc_code then
if dynamic > 0 then
start[0] = dynamic
end
start.font = font
if ca and ca > 0 then
start[a_colorspace] = ma == 0 and 1 or ma
start[a_color] = ca
end
if ta and ta > 0 then
start[a_transparency] = ta
end
n = n + 1
end
if linebreak == n then
if trace_firstlines then
head, start = insert_node_after(head,start,newpenalty(10000)) -- nobreak
head, start = insert_node_after(head,start,newkern(-65536))
head, start = insert_node_after(head,start,tracerrule(65536,4*65536,2*65536,"darkblue"))
end
head, start = insert_node_after(head,start,newpenalty(-10000)) -- break
break
end
start = start.next
end
end
free_node_list(temp)
return head, true
end
actions[v_word] = function(head,setting)
-- local attribute = fonts.specifiers.contextnumber(setting.feature) -- was experimental
local dynamic = setting.dynamic
local font = setting.font
local words = 0
local nofwords = setting.n or 1
local start = head
local ok = false
local ma = setting.ma or 0
local ca = setting.ca
local ta = setting.ta
while start do
local id = start.id
-- todo: delete disc nodes
if id == glyph_code then
if not ok then
words = words + 1
ok = true
end
if ca and ca > 0 then
start[a_colorspace] = ma == 0 and 1 or ma
start[a_color] = ca
end
if ta and ta > 0 then
start[a_transparency] = ta
end
if dynamic > 0 then
start[0] = dynamic
end
start.font = font
elseif id == disc_code then
-- continue
elseif id == kern_code then -- todo: fontkern
-- continue
else
ok = false
if words == nofwords then
break
end
end
start = start.next
end
return head, true
end
actions[v_default] = actions[v_line]
function firstlines.handler(head)
local start = head
local attr = nil
while start do
attr = start[a_firstline]
if attr then
break
elseif start.id == glyph then
break
else
start = start.next
end
end
if attr then
-- here as we can process nested boxes first so we need to keep state
tasks.disableaction("processors","typesetters.firstlines.handler")
-- texsetattribute(attribute,unsetvalue)
local alternative = settings.alternative or v_default
local action = actions[alternative] or actions[v_default]
if action then
if trace_firstlines then
report_firstlines("processing firstlines, alternative %a",alternative)
end
return action(head,settings)
end
end
return head, false
end
-- goodie
function commands.applytofirstcharacter(box,what)
local tbox = getbox(box) -- assumes hlist
local list = tbox.list
local done = nil
for n in traverse_id(glyph_code,list) do
list = remove_node(list,n)
done = n
break
end
if done then
tbox.list = list
local kind = type(what)
if kind == "string" then
context[what](done)
elseif kind == "function" then
what(done)
else
-- error
end
end
end
|
