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
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
|
from youseedee import ucd_data
from fontFeatures.shaperLib.Buffer import BufferItem
from .IndicShaperData import (
script_config,
syllable_machine_indic,
IndicPosition,
reassign_category_and_position_indic,
)
from .SyllabicShaper import SyllabicShaper
import unicodedata
DOTTED_CIRCLE = 0x25CC
class IndicShaper(SyllabicShaper):
syllable_machine = syllable_machine_indic
syllable_types = [
"consonant_syllable",
"vowel_syllable",
"standalone_cluster",
"symbol_cluster",
"broken_cluster",
"other",
]
@property
def config(self):
return script_config.get(self.buffer.script, script_config["Invalid"])
def override_features(self, shaper):
shaper.disable_feature("liga")
def consonant_position_from_face(self, consonant):
virama = self.config["virama"]
consonant_item = BufferItem.new_unicode(consonant)
virama_item = BufferItem.new_unicode(virama)
consonant_item.map_to_glyph(self.buffer.font)
virama_item.map_to_glyph(self.buffer.font)
if self.would_substitute("blwf", [virama_item, consonant_item]):
return IndicPosition.BELOW_C
if self.would_substitute("blwf", [consonant_item, virama_item]):
return IndicPosition.BELOW_C
if self.would_substitute("vatu", [virama_item, consonant_item]):
return IndicPosition.BELOW_C
if self.would_substitute("vatu", [consonant_item, virama_item]):
return IndicPosition.BELOW_C
if self.would_substitute("pstf", [virama_item, consonant_item]):
return IndicPosition.POST_C
if self.would_substitute("pstf", [consonant_item, virama_item]):
return IndicPosition.POST_C
if self.would_substitute("pref", [virama_item, consonant_item]):
return IndicPosition.POST_C
if self.would_substitute("pref", [consonant_item, virama_item]):
return IndicPosition.POST_C
return IndicPosition.BASE_C
def initial_reordering_pre(self):
if self.config["base_pos"] == "last": # Not Sinhala
for item in self.buffer.items:
if item.syllabic_position == IndicPosition.BASE_C:
item.syllabic_position = self.consonant_position_from_face(
item.codepoint
)
pass
def reassign_category(self, item):
reassign_category_and_position_indic(item)
def initial_reordering_consonant_syllable(self, start, end):
def cat(i):
return self.buffer.items[i].syllabic_category
def pos(i):
return self.buffer.items[i].syllabic_position
def swap(a, b):
self.buffer.items[b], self.buffer.items[a] = (
self.buffer.items[a],
self.buffer.items[b],
)
def is_joiner(n):
return cat(n) == "ZWJ" or cat(n) == "ZWNJ"
def is_consonant(n):
isc = cat(n)
is_medial = isc == "CM"
return (
isc in ["C", "CS", "Ra", "V", "PLACEHOLDER", "DOTTEDCIRCLE"]
or is_medial
)
if (
self.buffer.script == "Kannada"
and start + 3 <= end
and cat(start) == "Ra"
and cat(start + 1) == "H"
and cat(start + 2) == "ZWJ"
):
swap(start + 1, start + 2)
syllable_index = self.buffer.items[start].syllable_index
base = end
has_reph = False
limit = start
if (
"rphf" in self.plan.fontfeatures.features
and start + 3 <= end
and (
(self.config["reph_mode"] == "implicit" and not is_joiner(start + 2))
or (self.config["reph_mode"] == "explicit" and cat(start + 2) == "ZWJ")
)
):
if self.would_substitute(
"rphf", self.buffer.items[start : start + 2]
) or self.would_substitute("rphf", self.buffer.items[start : start + 3]):
limit = limit + 2
while limit < end and is_joiner(limit):
limit = limit + 1
base = start
has_reph = True
elif self.config["reph_mode"] == "log_repha" and cat(start) == "Repha":
limit = limit + 1
while limit < end and is_joiner(limit):
limit = limit + 1
base = start
has_reph = True
if self.config["base_pos"] == "last":
i = end
seen_below = False
while True:
i = i - 1
if is_consonant(i):
if pos(i) != IndicPosition.BELOW_C and (
pos(i) != IndicPosition.POST_C or seen_below
):
base = i
break
if pos(i) == IndicPosition.BELOW_C:
seen_below = True
base = i
else:
if start < i and cat(i) == "ZWJ" and cat(i - 1) == "H":
break
if i <= limit:
break
elif self.config["base_pos"] == "last_sinhala":
if not has_reph:
base = limit
for i in range(limit, end):
if is_consonant(i):
if limit < i and cat(i - 1) == "ZWJ":
break
else:
base = i
for i in range(base + 1, end):
if is_consonant(i):
self.buffer.items[i].syllabic_position = IndicPosition.BELOW_C
if has_reph and base == start and limit - base <= 2:
has_reph = False
self.plan.msg(
"Base consonant for syllable %i is %s"
% (syllable_index, self.buffer.items[base].glyph)
)
for i in range(start, base):
self.buffer.items[i].syllabic_position = min(IndicPosition.PRE_C, pos(i))
if base < end:
self.buffer.items[i].syllabic_position = IndicPosition.BASE_C
# Mark final consonants
for i in range(base + 1, end):
if cat(i) == "M":
for j in range(i, end):
if is_consonant(j):
self.buffer.items[j].syllabic_position = IndicPosition.FINAL_C
break
break
if has_reph:
self.buffer.items[start].syllabic_category = IndicPosition.RA_TO_BECOME_REPH
if self.config["old_spec"]:
disallow_double_halants = self.buffer.script == "Kannada"
for i in range(base + 1, end):
if cat(i) == "H":
j = end - 1
while j > i:
if is_consonant(j) or (
disallow_double_halants and cat(j) == "H"
):
break
j = j - 1
if cat(j) != "H" and j > i:
self.buffer.items.insert(j, self.buffer.items.pop(i))
self.plan.msg("Moved double halant", self.buffer)
break
last_pos = IndicPosition.START
for i in range(start, end):
if cat(i) in ["ZWJ", "ZWNJ", "N", "RS", "CM", "H"]:
self.buffer.items[i].syllabic_position = last_pos
if cat(i) == "H" and pos(i) == IndicPosition.PRE_M:
for j in range(i, start, -1):
if pos(j - 1) != IndicPosition.PRE_M:
self.buffer.items[i].syllabic_position = pos(j - 1)
break
elif pos(i) != IndicPosition.SMVD:
last_pos = pos(i)
last = base
for i in range(base + 1, end):
if is_consonant(i):
for j in range(last + 1, i):
if pos(j) < IndicPosition.SMVD:
self.buffer.items[j].syllabic_position = pos(i)
last = i
elif cat(i) == "M":
last = i
# As with Harfbuzz, temporarily abuse syllable index
for i in range(start, end):
self.buffer.items[i].syllable_index = start - i
# REORDER
self.buffer.items[start:end] = sorted(
self.buffer.items[start:end], key=lambda x: x.syllabic_position
)
base = end
for i in range(start, end):
if pos(i) == IndicPosition.BASE_C:
base = i
break
if self.config["old_spec"] or end - start > 127:
# Merge clusters
pass
else:
for i in range(base, end):
if self.buffer.items[i].syllable_index != 255:
max_i = i
j = start + self.buffer.items[i].syllable_index
while j != i:
max_i = max(max_i, j)
next_i = start + self.buffer.items[j].syllable_index
self.buffer.items[j].syllable_index = 255
j = next_i
if i != max_i:
# Merge clusters
pass
for i in range(start, end):
self.buffer.items[i].syllable_index = syllable_index
self.plan.msg("After initial reordering", self.buffer)
# Set up masks now. Note that these masks have the opposite
# value to Harfbuzz - i.e. False means "not masked"
rphf_mask = False
for i in range(start, end):
if pos(i) != IndicPosition.RA_TO_BECOME_REPH:
rphf_mask = True
self.buffer.items[i].feature_masks["rphf"] = rphf_mask
self.buffer.items[i].feature_masks["half"] = i > base
if (
not self.config["old_spec"]
and self.config["blwf_mode"] == "pre_and_post"
):
self.buffer.items[i].feature_masks["blwf"] = i > base
self.buffer.items[i].feature_masks["blwf"] = i < base
self.buffer.items[i].feature_masks["abvf"] = i < base
self.buffer.items[i].feature_masks["pstf"] = i < base
# We are not supporting old spec eyelash ra
# pref substitutes pairwise
pref_len = 2
i = base + 1
for j in range(0, i):
self.buffer.items[j].feature_masks["pref"] = True
while i < end - pref_len:
if self.would_substitute(
"pref", [self.buffer.items[i], self.buffer.items[i + 1]]
):
self.buffer.items[i].feature_masks["pref"] = False
self.buffer.items[i + 1].feature_masks["pref"] = False
i = i + 2
else:
self.buffer.items[i].feature_masks["pref"] = True
i = i + 1
# ZWJ/ZWNJ
for i in range(start + 1, end):
if cat(i) in ["ZWJ", "ZWNJ"]:
non_joiner = cat(i) == "ZWNJ"
j = i
while True:
j = j - 1
if non_joiner:
self.buffer.items[j].feature_masks["half"] = True
if not (j > start and not is_consonant(j)):
break
initial_reordering_syllable = {
"standalone_cluster": initial_reordering_consonant_syllable,
"consonant_syllable": initial_reordering_consonant_syllable,
}
def final_reordering_syllable(self, start, end):
def cat(i):
return self.buffer.items[i].syllabic_category
def pos(i):
return self.buffer.items[i].syllabic_position
def swap(a, b):
self.buffer.items[b], self.buffer.items[a] = (
self.buffer.items[a],
self.buffer.items[b],
)
def is_joiner(n):
return cat(n) == "ZWJ" or cat(n) == "ZWNJ"
def is_halant(n):
return cat(n) == "H"
def is_consonant(n):
isc = cat(n)
is_medial = isc == "CM"
return (
isc in ["C", "CS", "Ra", "V", "PLACEHOLDER", "DOTTEDCIRCLE"]
or is_medial
)
virama = self.config["virama"]
virama_item = BufferItem.new_unicode(virama)
virama_item.map_to_glyph(self.buffer.font)
if virama_item.glyph != ".notdef":
for i in range(start, end):
if (
self.buffer.items[i].glyph == virama_item.glyph
and self.buffer.items[i].ligated
and self.buffer.items[i].multiplied
):
self.buffer.items[i].syllabic_category = "H"
self.buffer.items[i].ligated = False
self.buffer.items[i].multiplied = False
try_pref = any(
[
"pref" in item.feature_masks and item.feature_masks["pref"] is False
for item in self.buffer.items
]
)
base = start
while base < end:
if pos(base) >= IndicPosition.BASE_C:
if try_pref and base + 1 < end:
for i in range(base + 1, end):
item = self.buffer.items[i]
if not item.feature_masks.get("pref", True):
if not (
item.substituted
and (item.ligated and not item.multiplied)
):
base = i
while base < end and is_halant(base):
base = base + 1
self.buffer.items[
base
].syllabic_positional_category = IndicPosition.BASE_C
try_pref = False
break
if self.buffer.script == "Malayalam":
i = base + 1
while i < end:
while i < end and is_joiner(i):
i = i + 1
if i == end or not is_halant(i):
break
i = i + 1
while i < end and is_joiner(i):
i = i + 1
if (
i < end
and is_consonant(i)
and pos(i) == IndicPosition.BELOW_C
):
base = i
self.buffer.items[
base
].syllabic_positional_category = IndicPosition.BASE_C
i = i + 1
if start < base and pos(base) > IndicPosition.BASE_C:
base = base - 1
break
base = base + 1
if base == end and start < base and cat(base - i) == "ZWJ":
base = base - 1
if base < end:
while start < base and cat(base) in ["N", "H"]:
base = base - 1
# Reorder matras
if start + 1 < end and start < base:
new_pos = base - 1
if base == end:
new_pos = base - 2
# XXX
for i in range(start, end):
self.buffer.items[i].feature_masks["init"] = True
if pos(start) == IndicPosition.PRE_M:
reverse_map = {k: v for k, v in self.buffer.font.unicode_map.items()}
if start == 0 or ucd_data(
reverse_map.get(self.buffer.items[start - 1].glyph, 0)
)["General_Category"] not in [
"Cf",
"Cn",
"Co",
"Cs",
"Ll",
"Lm",
"Lo",
"Lt",
"Lu",
"Mc",
"Me",
"Mn",
]:
self.buffer.items[start].feature_masks["init"] = False
def normalize_unicode_buffer(self):
unicodes = [item.codepoint for item in self.buffer.items]
newunicodes = []
for cp in unicodes:
if cp in [0x0931, 0x09DC, 0x09DD, 0x0B94]:
newunicodes.append(cp)
elif cp in [0x0DDA, 0x0DDC, 0x0DDD, 0x0DDE]: # Sinhala split matras
glyph = BufferItem.new_unicode(cp)
glyph.map_to_glyph(self.buffer.font)
if self.would_substitute("pstf", [glyph]):
newunicodes.extend([0x0DD9, cp])
else:
newunicodes.append(cp)
else:
newunicodes.extend(
[ord(x) for x in unicodedata.normalize("NFD", chr(cp))]
)
# Now recompose
newstring = ""
ix = 0
while ix < len(newunicodes):
a = newunicodes[ix]
if ix + 1 == len(newunicodes):
newstring = newstring + chr(a)
break
b = newunicodes[ix + 1]
s = chr(a) + chr(b)
# composed = unicodedata.normalize("NFC", s)
if ucd_data(a)["General_Category"][0] == "M":
newstring = newstring + chr(a)
ix = ix + 1
continue
elif a == 0x9AF and b == 0x9BC:
newstring = newstring + chr(0x9DF)
ix = ix + 2
continue
# elif composed != unicodedata.normalize("NFD", s):
# assert(len(s) == 1)
# newunicodes[ix] = ord(x)
# del newunicodes[ix+1]
# continue
else:
newstring = newstring + chr(a)
ix = ix + 1
self.buffer.store_unicode(newstring)
|
