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
|
if not modules then modules = { } end modules ['font-imp-math'] = {
version = 1.001,
comment = "companion to font-ini.mkiv and hand-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next, type, tonumber = next, type, tonumber
local fonts = fonts
local helpers = fonts.helpers
local registerotffeature = fonts.handlers.otf.features.register
local setmetatableindex = table.setmetatableindex
local sortedhash = table.sortedhash
local copytable = table.copy
local texconditionals = tex.conditionals
-- tfmdata.properties.mathnolimitsmode = tonumber(value) or 0
-- local splitter = lpeg.splitat(",",tonumber)
-- local lpegmatch = lpeg.match
--
-- local function initialize(tfmdata,value)
-- local mathparameters = tfmdata.mathparameters
-- if mathparameters then
-- local sup, sub
-- if type(value) == "string" then
-- sup, sub = lpegmatch(splitter,value) -- settings_to_array
-- if not sup then
-- sub, sup = 0, 0
-- elseif not sub then
-- sub, sup = sup, 0
-- end
-- elseif type(value) == "number" then
-- sup, sub = 0, value
-- end
-- if sup then
-- mathparameters.NoLimitSupFactor = sup
-- end
-- if sub then
-- mathparameters.NoLimitSubFactor = sub
-- end
-- end
-- end
--
-- registerotffeature {
-- name = "mathnolimitsmode",
-- description = "influence nolimits placement",
-- initializers = {
-- base = initialize,
-- node = initialize,
-- }
-- }
-- this will become a mode in the engine -- done
--
-- local function initialize(tfmdata,value)
-- tfmdata.properties.nostackmath = value and true
-- end
--
-- registerotffeature {
-- name = "nostackmath",
-- description = "disable math stacking mechanism",
-- initializers = {
-- base = initialize,
-- node = initialize,
-- }
-- }
-- A quick and dirty and low level implementation but okay for testing:
function fonts.helpers.mathscriptslots(tfmdata,textcode)
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local rawfeatures = rawresources and rawresources.features
local basesubstitutions = rawfeatures and rawfeatures.gsub
local sequences = basesubstitutions and tfmdata.resources.sequences
if sequences then
local characters = tfmdata.characters
if characters[textcode] then
for s=1,#sequences do
local sequence = sequences[s]
local sfeatures = sequence.features
if sfeatures and sfeatures.ssty then
local steps = sequence.steps
for i=1,#steps do
local coverage = steps[i].coverage
if coverage then
local okay = coverage[textcode]
if okay then
-- can be single or table
return okay
end
end
end
end
end
end
end
end
local function manipulate(tfmdata,value)
-- if texconditionals["c_font_compact"] then
if value then -- so basically always
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local rawfeatures = rawresources and rawresources.features
local basesubstitutions = rawfeatures and rawfeatures.gsub
local sequences = basesubstitutions and tfmdata.resources.sequences
if sequences then
local characters = tfmdata.characters
for s=1,#sequences do
local sequence = sequences[s]
local sfeatures = sequence.features
if sfeatures and sfeatures.ssty then
local steps = sequence.steps
for i=1,#steps do
local coverage = steps[i].coverage
if coverage then
for textcode, v in next, coverage do
local textdata = characters[textcode]
if textdata then
local scriptcode, scriptscriptcode
local sstykind = type(v)
if sstykind == "table" then
scriptcode = v[1]
scriptscriptcode = v[2]
elseif sstykind == "number" then
scriptcode = v
scriptscriptcode = v
else
-- weird
end
if scriptcode then
local scriptdata = characters[scriptcode]
local scriptscriptdata = characters[scriptscriptcode]
if scriptdata and scriptdata ~= textdata then
textdata.smaller = scriptcode
if scriptscriptdata and scriptdata ~= scriptscriptdata then
scriptdata.smaller = scriptscriptcode
end
end
end
end
end
end
end
end
end
end
end
end
local function initialize(tfmdata,value)
-- Here it really gets enabled as the scales are used.
if texconditionals["c_font_compact"] then
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local mathconstants = rawresources.mathconstants
if mathconstants then
local parameters = tfmdata.parameters
local properties = tfmdata.properties
parameters.textscale = 1000
parameters.scriptscale = mathconstants.ScriptPercentScaleDown * 10
parameters.scriptscriptscale = mathconstants.ScriptScriptPercentScaleDown * 10
properties.compactmath = true
end
end
end
-- local specification = {
-- name = "compactmath",
-- description = "use one math font",
-- manipulators = {
-- base = manipulate,
-- node = manipulate,
-- },
-- initializers = {
-- base = initialize,
-- node = initialize,
-- }
-- }
registerotffeature {
name = "compactmath",
description = "use one math font",
initializers = {
base = function(...) manipulate(...) initialize(...) end,
node = function(...) manipulate(...) initialize(...) end,
}
}
-- The problem is that the traditional code path doesn't add an italic to the subscript,
-- simply because it assumes that the width has that already subtracted. So, we cannot
-- compensate in the following way. We're stuck with the fact that the texgyre fonts
-- assume a traditional tex engine.
-- local function manipulate(tfmdata,key,value)
-- if value == "correct" then
-- local chardata = characters.data
-- for unicode, data in next, tfmdata.characters do
-- local italic = data.italic
-- if italic then
-- -- todo: only letters
-- data.width = (data.width or 0) + italic
-- local cd = chardata[unicode]
-- if cd then
-- local visual = cd.visual
-- if visual == "it" or visual == "bi" then
-- italic = -italic
-- else
-- italic = 0
-- end
-- else
-- italic = 0
-- end
-- data.italic = italic
-- end
-- end
-- end
-- end
local function initialize(tfmdata,value)
if type(value) == "string" then
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local mathconstants = rawresources.mathconstants
if mathconstants then
local bitmap = tex.stringtocodesbitmap(value,tex.mathcontrolcodes)
-- logs.report("mathfont","setting math control to %08X",bitmap)
tfmdata.properties.mathcontrol = bitmap
end
end
end
registerotffeature {
name = "mathcontrol",
description = "control specific old/new math handling",
initializers = {
base = initialize,
node = initialize,
}
}
local function initialize(tfmdata,value)
if value then
local validlookups, lookuplist = fonts.handlers.otf.collectlookups(tfmdata.shared.rawdata,"flac","math","dflt")
if validlookups then
-- it's quite likely just one step
local characters = tfmdata.characters
local changed = tfmdata.changed
for i=1,#lookuplist do
local lookup = lookuplist[i]
local steps = lookup.steps
local nofsteps = lookup.nofsteps
for i=1,nofsteps do
local coverage = steps[i].coverage
if coverage then
for k, v in next, coverage do
local c = characters[k]
local f = characters[v]
if c and f then
c.flataccent = v
if not f.unicode then
f.unicode = c.unicode
end
end
end
end
end
end
end
end
end
registerotffeature {
name = "flattenaccents",
description = "mapping accents to flat ones",
initializers = {
base = initialize,
node = initialize,
}
}
-- todo: document our privates
-- This horrible hack is needed because when opentype math showed up and math was
-- added to unicode folks had forgotten about different script shapes so we not only
-- have a retrospective variant selector but inconsistent defaults. What a mess it
-- is. So the quick and dirty solution is:
--
-- add copies in private slots
-- use a pseudo feature to access those
-- and optionally afterwards replace the original slots
-- local coverage = { }
--
-- local function initialize(tfmdata,value)
-- if value then
-- if not next(coverage) then
-- for k, char in next, mathematics.alphabets.sr.tf.lcletters do
-- coverage[char] = 0xFE800 + k
-- end
-- for k, char in next, mathematics.alphabets.sr.tf.ucletters do
-- coverage[char] = 0xFE800 + k
-- end
-- fonts.handlers.otf.addfeature {
-- name = "savemathscripts",
-- type = "substitution",
-- data = coverage,
-- }
-- end
-- local characters = tfmdata.characters
-- local descriptions = tfmdata.descriptions
-- for char, private in next, coverage do
-- local data = characters[char]
-- if data and not characters[private] then
-- -- otherwise we need a virtual
-- characters [private] = copytable(data)
-- descriptions[private] = copytable(descriptions[char])
-- end
-- end
-- end
-- end
--
-- registerotffeature {
-- name = "copymathscripts",
-- description = "copy math script",
-- prepend = 1,
-- initializers = {
-- base = initialize,
-- node = initialize,
-- }
-- }
|