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
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
|
#!/usr/bin/env texlua
-----------------------------------------------------------------------
-- FILE: luaotfload-auxiliary.lua
-- DESCRIPTION: part of luaotfload
-- REQUIREMENTS: luaotfload 2.2
-- AUTHOR: Khaled Hosny, Élie Roux, Philipp Gesang
-- VERSION: 1.0
-- CREATED: 2013-05-01 14:40:50+0200
-----------------------------------------------------------------------
--
--- this file addresses issue #24
--- https://github.com/lualatex/luaotfload/issues/24#
luaotfload = luaotfload or {}
luaotfload.aux = luaotfload.aux or { }
config = config or { }
config.luaotfload = config.luaotfload or { }
local aux = luaotfload.aux
local log = luaotfload.log
local identifiers = fonts.hashes.identifiers
local fontid = font.id
local texsprint = tex.sprint
local utf8 = unicode.utf8
local stringlower = string.lower
local stringformat = string.format
local stringgsub = string.gsub
local stringbyte = string.byte
-----------------------------------------------------------------------
--- font patches
-----------------------------------------------------------------------
--[[doc--
This sets two dimensions apparently relied upon by the unicode-math
package.
--doc]]--
local set_sscale_dimens = function (fontdata)
local mathconstants = fontdata.MathConstants
local parameters = fontdata.parameters
if mathconstants then
parameters[10] = mathconstants.ScriptPercentScaleDown or 70
parameters[11] = mathconstants.ScriptScriptPercentScaleDown or 50
end
return fontdata
end
luatexbase.add_to_callback(
"luaotfload.patch_font",
set_sscale_dimens,
"luaotfload.aux.set_sscale_dimens")
--- fontobj -> int
local lookup_units = function (fontdata)
local metadata = fontdata.shared and fontdata.shared.rawdata.metadata
if metadata and metadata.units_per_em then
return metadata.units_per_em
elseif fontdata.parameters and fontdata.parameters.units then
return fontdata.parameters.units
elseif fontdata.units then --- v1.x
return fontdata.units
end
return 1000
end
--[[doc--
This callback corrects some values of the Cambria font.
--doc]]--
local patch_cambria_domh = function (fontdata)
local mathconstants = fontdata.MathConstants
if mathconstants and fontdata.psname == "CambriaMath" then
--- my test Cambria has 2048
local units_per_em = fontdata.units_per_em or lookup_units(fontdata)
local sz = fontdata.parameters.size or fontdata.size
local mh = 2800 / units_per_em * sz
if mathconstants.DisplayOperatorMinHeight < mh then
mathconstants.DisplayOperatorMinHeight = mh
end
end
end
luatexbase.add_to_callback(
"luaotfload.patch_font",
patch_cambria_domh,
"luaotfload.aux.patch_cambria_domh")
--[[doc--
Comment from fontspec:
“Here we patch fonts tfm table to emulate \XeTeX's \cs{fontdimen8},
which stores the caps-height of the font. (Cf.\ \cs{fontdimen5} which
stores the x-height.)
Falls back to measuring the glyph if the font doesn't contain the
necessary information.
This needs to be extended for fonts that don't contain an `X'.”
--doc]]--
local set_capheight = function (fontdata)
local shared = fontdata.shared
local parameters = fontdata.parameters
local capheight
if shared then
local units_per_em = parameters.units
local size = parameters.size
local os2_capheight = shared.rawdata.metadata.pfminfo.os2_capheight
if os2_capheight > 0 then
capheight = os2_capheight / units_per_em * size
else
local X8 = stringbyte"X"
if fontdata.characters[X8] then
capheight = fontdata.characters[X8].height
else
capheight = parameters.ascender / units_per_em * size
end
end
else
local X8 = stringbyte"X"
if fontdata.characters[X8] then
capheight = fontdata.characters[X8].height
end
end
if capheight then
--- is this legit? afaics there’s nothing else on the
--- array part of that table
fontdata.parameters[8] = capheight
end
end
luatexbase.add_to_callback(
"luaotfload.patch_font",
set_capheight,
"luaotfload.aux.set_capheight")
-----------------------------------------------------------------------
--- glyphs
-----------------------------------------------------------------------
--- int -> int -> bool
local font_has_glyph = function (font_id, codepoint)
local fontdata = fonts.hashes.identifiers[font_id]
if fontdata then
if fontdata.characters[codepoint] ~= nil then return true end
end
return false
end
aux.font_has_glyph = font_has_glyph
--- int -> bool
local current_font_has_glyph = function (codepoint)
return font_has_glyph (font.current(), codepoint)
end
aux.current_font_has_glyph = current_font_has_glyph
local do_if_glyph_else = function (chr, positive, negative)
local codepoint = tonumber(chr)
if not codepoint then codepoint = utf8.byte(chr) end
if current_font_has_glyph(codepoint) then
tex.sprint(positive)
else
tex.sprint(negative)
end
end
aux.do_if_glyph_else = do_if_glyph_else
--[[doc--
This one is approximately “name_to_slot” from the microtype package;
note that it is all about Adobe Glyph names and glyph slots in the
font. The names and values may diverge from actual Unicode.
http://www.adobe.com/devnet/opentype/archives/glyph.html
--doc]]--
--- string -> (int | false)
local slot_of_name = function (glyphname)
local fontdata = identifiers[font.current()]
if fontdata then
local unicode = fontdata.resources.unicodes[glyphname]
if unicode and type(unicode) == "number" then
return unicode
else
return unicode[1] --- for multiple components
end
end
return false
end
aux.slot_of_name = slot_of_name
--[[doc--
Inverse of above; not authoritative as to my knowledge the official
inverse of the AGL is the AGLFN. Maybe this whole issue should be
dealt with in a separate package that loads char-def.lua and thereby
solves the problem for the next couple decades.
http://partners.adobe.com/public/developer/en/opentype/aglfn13.txt
--doc]]--
local indices
--- int -> (string | false)
local name_of_slot = function (codepoint)
if not indices then --- this will load the glyph list
local unicodes = fonts.encodings.agl.unicodes
indices = table.swapped(unicodes)
end
local glyphname = indices[codepoint]
if glyphname then
return glyphname
end
return false
end
aux.name_of_slot = name_of_slot
-----------------------------------------------------------------------
--- features / scripts / languages
-----------------------------------------------------------------------
--- lots of arrowcode ahead
--[[doc--
This function, modeled after “check_script()” from fontspec, returns
true if in the given font, the script “asked_script” is accounted for in at
least one feature.
--doc]]--
--- int -> string -> bool
local provides_script = function (font_id, asked_script)
asked_script = stringlower(asked_script)
if font_id and font_id > 0 then
local fontdata = identifiers[font_id].shared.rawdata
if fontdata then
local fontname = fontdata.metadata.fontname
local features = fontdata.resources.features
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
for feature, data in next, featuredata do
if data[asked_script] then
log(stringformat(
"font no %d (%s) defines feature %s for script %s",
font_id, fontname, feature, asked_script))
return true
end
end
end
log(stringformat(
"font no %d (%s) defines no feature for script %s",
font_id, fontname, asked_script))
end
end
log(stringformat("no font with id %d", font_id))
return false
end
aux.provides_script = provides_script
--[[doc--
This function, modeled after “check_language()” from fontspec, returns
true if in the given font, the language with tage “asked_language” is
accounted for in the script with tag “asked_script” in at least one
feature.
--doc]]--
--- int -> string -> string -> bool
local provides_language = function (font_id, asked_script, asked_language)
asked_script = stringlower(asked_script)
asked_language = stringlower(asked_language)
if font_id and font_id > 0 then
local fontdata = identifiers[font_id].shared.rawdata
if fontdata then
local fontname = fontdata.metadata.fontname
local features = fontdata.resources.features
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
for feature, data in next, featuredata do
local scriptdata = data[asked_script]
if scriptdata and scriptdata[asked_language] then
log(stringformat("font no %d (%s) defines feature %s "
.. "for script %s with language %s",
font_id, fontname, feature,
asked_script, asked_language))
return true
end
end
end
log(stringformat(
"font no %d (%s) defines no feature for script %s with language %s",
font_id, fontname, asked_script, asked_language))
end
end
log(stringformat("no font with id %d", font_id))
return false
end
aux.provides_language = provides_language
--[[doc--
We strip the syntax elements from feature definitions (shouldn’t
actually be there in the first place, but who cares ...)
--doc]]--
local lpeg = require"lpeg"
local C, P, S = lpeg.C, lpeg.P, lpeg.S
local lpegmatch = lpeg.match
local sign = S"+-"
local rhs = P"=" * P(1)^0 * P(-1)
local strip_garbage = sign^-1 * C((1 - rhs)^1)
--s = "+foo" --> foo
--ss = "-bar" --> bar
--sss = "baz" --> baz
--t = "foo=bar" --> foo
--tt = "+bar=baz" --> bar
--ttt = "-baz=true" --> baz
--
--print(lpeg.match(strip_garbage, s))
--print(lpeg.match(strip_garbage, ss))
--print(lpeg.match(strip_garbage, sss))
--print(lpeg.match(strip_garbage, t))
--print(lpeg.match(strip_garbage, tt))
--print(lpeg.match(strip_garbage, ttt))
--[[doc--
This function, modeled after “check_feature()” from fontspec, returns
true if in the given font, the language with tag “asked_language” is
accounted for in the script with tag “asked_script” in feature
“asked_feature”.
--doc]]--
--- int -> string -> string -> string -> bool
local provides_feature = function (font_id, asked_script,
asked_language, asked_feature)
asked_script = stringlower(asked_script)
asked_language = stringlower(asked_language)
asked_feature = lpegmatch(strip_garbage, asked_feature)
if font_id and font_id > 0 then
local fontdata = identifiers[font_id].shared.rawdata
if fontdata then
local features = fontdata.resources.features
local fontname = fontdata.metadata.fontname
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
local feature = featuredata[asked_feature]
if feature then
local scriptdata = feature[asked_script]
if scriptdata and scriptdata[asked_language] then
log(stringformat("font no %d (%s) defines feature %s "
.. "for script %s with language %s",
font_id, fontname, asked_feature,
asked_script, asked_language))
return true
end
end
end
log(stringformat(
"font no %d (%s) does not define feature %s for script %s with language %s",
font_id, fontname, asked_feature, asked_script, asked_language))
end
end
log(stringformat("no font with id %d", font_id))
return false
end
aux.provides_feature = provides_feature
-----------------------------------------------------------------------
--- font dimensions
-----------------------------------------------------------------------
--- string -> string -> int
local get_math_dimension = function (csname, dimenname)
local fontdata = identifiers[fontid(csname)]
local mathdata = fontdata.mathparameters
if mathdata then return mathdata[dimenname] or 0 end
return 0
end
aux.get_math_dimension = get_math_dimension
--- string -> string -> unit
local sprint_math_dimension = function (csname, dimenname)
local dim = get_math_dimension(csname, dimenname)
texsprint(luatexbase.catcodetables["latex-package"], dim)
texsprint(luatexbase.catcodetables["latex-package"], "sp")
end
aux.sprint_math_dimension = sprint_math_dimension
-- vim:tw=71:sw=2:ts=2:expandtab
|