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
|
if not modules then modules = { } end modules ['font-gbn'] = {
version = 1.001,
comment = "companion to luatex-*.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- generic [base|node] mode handler
if context then
texio.write_nl("fatal error: this module is not for context")
os.exit()
end
local fonts = fonts
local nodes = nodes
local nuts = nodes.nuts -- context abstraction of direct nodes
local traverse_id = nuts.traverse_id
local remove_node = nuts.remove
local free_node = nuts.free
local glyph_code = nodes.nodecodes.glyph
local disc_code = nodes.nodecodes.disc
local tonode = nuts.tonode
local tonut = nuts.tonut
local getfont = nuts.getfont
local getchar = nuts.getchar
local getid = nuts.getid
local getboth = nuts.getboth
local getprev = nuts.getprev
local getnext = nuts.getnext
local getdisc = nuts.getdisc
local setchar = nuts.setchar
local setlink = nuts.setlink
local setprev = nuts.setprev
-- from now on we apply ligaturing and kerning here because it might interfere with complex
-- opentype discretionary handling where the base ligature pass expect some weird extra
-- pointers (which then confuse the tail slider that has some checking built in)
local n_ligaturing = node.ligaturing
local n_kerning = node.kerning
local ligaturing = nuts.ligaturing
local kerning = nuts.kerning
local basemodepass = true
local function l_warning() texio.write_nl("warning: node.ligaturing called directly") l_warning = nil end
local function k_warning() texio.write_nl("warning: node.kerning called directly") k_warning = nil end
function node.ligaturing(...)
if basemodepass and l_warning then
l_warning()
end
return n_ligaturing(...)
end
function node.kerning(...)
if basemodepass and k_warning then
k_warning()
end
return n_kerning(...)
end
function nodes.handlers.setbasemodepass(v)
basemodepass = v
end
function nodes.handlers.nodepass(head)
local fontdata = fonts.hashes.identifiers
if fontdata then
local nuthead = tonut(head)
local usedfonts = { }
local basefonts = { }
local prevfont = nil
local basefont = nil
local variants = nil
local redundant = nil
for n in traverse_id(glyph_code,nuthead) do
local font = getfont(n)
if font ~= prevfont then
if basefont then
basefont[2] = getprev(n)
end
prevfont = font
local used = usedfonts[font]
if not used then
local tfmdata = fontdata[font] --
if tfmdata then
local shared = tfmdata.shared -- we need to check shared, only when same features
if shared then
local processors = shared.processes
if processors and #processors > 0 then
usedfonts[font] = processors
elseif basemodepass then
basefont = { n, nil }
basefonts[#basefonts+1] = basefont
end
end
local resources = tfmdata.resources
variants = resources and resources.variants
variants = variants and next(variants) and variants or false
end
else
local tfmdata = fontdata[prevfont]
if tfmdata then
local resources = tfmdata.resources
variants = resources and resources.variants
variants = variants and next(variants) and variants or false
end
end
end
if variants then
local char = getchar(n)
if char >= 0xFE00 and (char <= 0xFE0F or (char >= 0xE0100 and char <= 0xE01EF)) then
local hash = variants[char]
if hash then
local p = getprev(n)
if p and getid(p) == glyph_code then
local variant = hash[getchar(p)]
if variant then
setchar(p,variant)
end
end
end
-- per generic user request we always remove selectors
if not redundant then
redundant = { n }
else
redundant[#redundant+1] = n
end
end
end
end
local nofbasefonts = #basefonts
if redundant then
for i=1,#redundant do
local r = redundant[i]
local p, n = getboth(r)
if r == nuthead then
nuthead = n
setprev(n)
else
setlink(p,n)
end
if nofbasefonts > 0 then
for i=1,nofbasefonts do
local bi = basefonts[i]
if r == bi[1] then
bi[1] = n
end
if r == bi[2] then
bi[2] = n
end
end
end
free_node(r)
end
end
for d in traverse_id(disc_code,nuthead) do
local _, _, r = getdisc(d)
if r then
for n in traverse_id(glyph_code,r) do
local font = getfont(n)
if font ~= prevfont then
prevfont = font
local used = usedfonts[font]
if not used then
local tfmdata = fontdata[font] --
if tfmdata then
local shared = tfmdata.shared -- we need to check shared, only when same features
if shared then
local processors = shared.processes
if processors and #processors > 0 then
usedfonts[font] = processors
end
end
end
end
end
end
end
end
if next(usedfonts) then
for font, processors in next, usedfonts do
for i=1,#processors do
head = processors[i](head,font,0) or head
end
end
end
if basemodepass and nofbasefonts > 0 then
for i=1,nofbasefonts do
local range = basefonts[i]
local start = range[1]
local stop = range[2]
if start then
local front = nuthead == start
local prev, next
if stop then
next = getnext(stop)
start, stop = ligaturing(start,stop)
start, stop = kerning(start,stop)
else
prev = getprev(start)
start = ligaturing(start)
start = kerning(start)
end
if prev then
setlink(prev,start)
end
if next then
setlink(stop,next)
end
if front and nuthead ~= start then
head = tonode(start)
end
end
end
end
return head, true
else
return head, false
end
end
function nodes.handlers.basepass(head)
if not basemodepass then
head = n_ligaturing(head)
head = n_kerning(head)
end
return head, true
end
local nodepass = nodes.handlers.nodepass
local basepass = nodes.handlers.basepass
local injectpass = nodes.injections.handler
local protectpass = nodes.handlers.protectglyphs
function nodes.simple_font_handler(head)
if head then
head = nodepass(head)
head = injectpass(head)
if not basemodepass then
head = basepass(head)
end
protectpass(head)
return head, true
else
return head, false
end
end
|
