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
|
from .IndicShaperData import IndicPosition, make_syllable_machine
from .SyllabicShaper import SyllabicShaper
import unicodedata
from youseedee import ucd_data
from collections import OrderedDict
khmer_category_reassignments = {
0x179A: "Ra",
0x17CC: "Robatic",
0x17C9: "Robatic",
0x17CA: "Robatic",
0x17C6: "Xgroup",
0x17CB: "Xgroup",
0x17CD: "Xgroup",
0x17CE: "Xgroup",
0x17CF: "Xgroup",
0x17D0: "Xgroup",
0x17D1: "Xgroup",
0x17C7: "Ygroup",
0x17C8: "Ygroup",
0x17DD: "Ygroup",
0x17D3: "Ygroup",
}
states = OrderedDict(
c="(C | Ra | V)",
cn="c ((ZWJ|ZWNJ)? Robatic)?",
joiner="(ZWJ | ZWNJ)",
xgroup="(joiner* Xgroup)*",
ygroup="Ygroup*",
matra_group="VPre? xgroup VBlw? xgroup (joiner? VAbv)? xgroup VPst?",
syllable_tail="xgroup matra_group xgroup (Coeng c)? ygroup",
broken_cluster="(Coeng cn)* (Coeng | syllable_tail)",
consonant_syllable="(cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster",
)
class KhmerShaper(SyllabicShaper):
repha = "Repha"
syllable_machine = make_syllable_machine(
states,
additional_categories=[
"Ra",
"Robatic",
"Xgroup",
"Ygroup",
"VPre",
"VBlw",
"VAbv",
"VPst",
],
)
syllable_types = ["consonant_syllable", "broken_cluster", "other"]
def collect_features(self, shaper):
shaper.add_pause(self.setup_syllables)
shaper.add_pause(self.initial_reordering)
shaper.add_features("locl", "ccmp")
shaper.add_features("pref", "blwf", "abvf", "pstf", "cfar")
shaper.add_pause() # Clear syllables
shaper.add_features("pres", "blws", "abvs", "psts")
def override_features(self, shaper):
shaper.add_features("clig")
shaper.disable_feature("liga")
def reassign_category(self, item):
cp = item.codepoint
if cp in khmer_category_reassignments:
item.syllabic_category = khmer_category_reassignments[cp]
if item.syllabic_category == "M":
if item.syllabic_position == IndicPosition.PRE_C:
item.syllabic_category = "VPre"
elif item.syllabic_position == IndicPosition.ABOVE_C:
item.syllabic_category = "VAbv"
elif item.syllabic_position == IndicPosition.BELOW_C:
item.syllabic_category = "VBlw"
elif item.syllabic_position == IndicPosition.POST_C:
item.syllabic_category = "VPst"
def initial_reordering_consonant_syllable(self, start, end):
def cat(i):
return self.buffer.items[i].syllabic_category
def mask_disallow(places, *feats):
for p in places:
for f in feats:
self.buffer.items[p].feature_masks[f] = True
def mask_allow(places, *feats):
for p in places:
for f in feats:
self.buffer.items[p].feature_masks[f] = False
mask_allow(range(start + 1, end), "blwf", "advf", "pstf")
mask_disallow(range(start, end), "cfar")
num_coengs = 0
for i in range(start + 1, end):
if cat(i) == "Coeng" and num_coengs <= 2 and i + 1 < end:
num_coengs += 1
if cat(i + 1) == "Ra":
mask_allow([i, i + 1], "pref")
# Move the Coeng,Ro sequence to the start.
# XXX merge_clusters
ro = self.buffer.items.pop(i + 1)
coeng = self.buffer.items.pop(i)
self.buffer.items = (
self.buffer.items[:start]
+ [coeng, ro]
+ self.buffer.items[start:]
)
mask_allow(range(i + 2, end), "cfar")
num_coengs = 2
elif cat(i) == "VPre":
# XXX merge_clusters
vpre = self.buffer.items.pop(i)
self.buffer.items = (
self.buffer.items[:start] + [vpre] + self.buffer.items[start:]
)
initial_reordering_syllable = {
"broken_cluster": initial_reordering_consonant_syllable,
"consonant_syllable": initial_reordering_consonant_syllable,
}
def normalize_unicode_buffer(self):
unicodes = [item.codepoint for item in self.buffer.items]
newunicodes = []
for cp in unicodes:
if cp in [0x17BE, 0x17BF, 0x17C0, 0x17C4, 0x17C5]:
newunicodes.extend([0x17C1, 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 composed != unicodedata.normalize("NFD", s):
assert len(s) == 1
newunicodes[ix] = ord(s)
del newunicodes[ix + 1]
continue
else:
newstring = newstring + chr(a)
ix = ix + 1
self.buffer.store_unicode(newstring)
|
