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from youseedee import ucd_data, database
from .SyllabicShaper import SyllabicShaper
from .IndicShaperData import make_syllable_machine
import unicodedata
from collections import OrderedDict
states = OrderedDict(
h="H | HVM | Sk",
consonant_modifiers="CMAbv* CMBlw* ((h B | SUB) CMAbv? CMBlw*)*",
medial_consonants="MPre? MAbv? MBlw? MPst?",
dependent_vowels="VPre* VAbv* VBlw* VPst*",
vowel_modifiers="HVM? VMPre* VMAbv* VMBlw* VMPst*",
final_consonants="FAbv* FBlw* FPst*",
final_modifiers="FMAbv* FMBlw* | FMPst?",
complex_syllable_start="(R | CS)? (B | GB)",
complex_syllable_middle="consonant_modifiers medial_consonants dependent_vowels vowel_modifiers (Sk B)*",
complex_syllable_tail="complex_syllable_middle final_consonants final_modifiers",
number_joiner_terminated_cluster_tail="(HN N)* HN",
numeral_cluster_tail="(HN N)+",
symbol_cluster_tail="SMAbv+ SMBlw* | SMBlw+",
virama_terminated_cluster="complex_syllable_start consonant_modifiers h",
sakot_terminated_cluster="complex_syllable_start complex_syllable_middle Sk",
standard_cluster="complex_syllable_start complex_syllable_tail",
broken_cluster="R? (complex_syllable_tail | number_joiner_terminated_cluster_tail | numeral_cluster_tail | symbol_cluster_tail)",
number_joiner_terminated_cluster="N number_joiner_terminated_cluster_tail",
numeral_cluster="N numeral_cluster_tail?",
symbol_cluster="(S | GB) symbol_cluster_tail?",
hieroglyph_cluster="SB+ | SB* G SE* (J SE* (G SE*)?)*",
independent_cluster="O",
)
use_categories = set([x[2] for x in database["USECategory.txt"]["data"]])
class USEShaper(SyllabicShaper):
basic_features = ["rkrf", "abvf", "blwf", "half", "pstf", "vatu", "cjct"]
topographical_features = ["isol", "init", "medi", "fina"]
other_features = ["abvs", "blws", "haln", "pres", "psts"]
repha = "R"
syllable_machine = make_syllable_machine(
states, additional_categories=use_categories
)
syllable_types = [
"independent_cluster",
"virama_terminated_cluster",
"sakot_terminated_cluster",
"standard_cluster",
"number_joiner_terminated_cluster",
"numeral_cluster",
"symbol_cluster",
"hieroglyph_cluster",
"broken_cluster",
"other",
]
def collect_features(self, shaper):
shaper.add_pause(self.setup_syllables)
# Default glyph pre-processing
shaper.add_features("locl", "ccmp", "nukt", "akhn")
shaper.add_pause(self.clear_substitution)
shaper.add_features("rphf")
shaper.add_pause(self.record_rphf_use)
shaper.add_pause(self.clear_substitution)
shaper.add_features("pref")
shaper.add_pause(self.record_pref_use)
shaper.add_features(*self.basic_features)
shaper.add_pause(self.initial_reordering)
# shaper.add_pause(self.clear_syllables)
shaper.add_features(*self.topographical_features)
shaper.add_pause()
shaper.add_features(*self.other_features)
def assign_category(self, item):
item.syllabic_category = ucd_data(item.codepoint).get("USE_Category", "X")
# Separate positional categories are not used, it's all in the syllabic_category
item.positional_category = "x"
def cat(self, i):
return self.buffer.items[i].syllabic_category
def setup_syllables(self, shaper):
super().setup_syllables(shaper)
self.setup_rphf_mask()
self.setup_topographical_masks()
def setup_rphf_mask(self):
for index, syll_type, start, end in self.iterate_syllables():
if self.cat(start) == "R":
limit = 1
else:
limit = min(3, end - start)
for i in range(start, end):
self.buffer.items[i].feature_masks["rphf"] = i > start + limit
def clear_substitution(self, shaper):
for i in self.buffer.items:
i.substituted = False
def record_pref_use(self, shaper):
for i in self.buffer.items:
if i.substituted:
i.syllabic_category = "VPre"
def record_rphf_use(self, shaper):
for i in self.buffer.items:
if i.substituted:
i.syllabic_category = "R"
def is_post_base(self, i):
return self.cat(i) in [
"FAbv",
"FBlw",
"FPst",
"MAbv",
"MBlw",
"MPst",
"MPre",
"VAbv",
"VBlw",
"VPst",
"VPre",
"VMAbv",
"VMBlw",
"VMPst",
"VMPre",
]
def is_halant(self, i):
return self.cat(i) in ["H", "HVM"] and not self.buffer.items[i].ligated
def reorder_syllable(self, start, end):
if self.cat(start) == "R":
for i in range(start + 1, end):
post_base = self.is_post_base(i) or self.is_halant(i)
if post_base or i == end - 1:
if post_base:
i -= 1
self.buffer.merge_clusters(start, i + 1)
self.buffer.move_item(src=start, dest=i)
break
j = start
for i in range(start, end):
if self.is_halant(i):
j = i + 1
if self.cat(i) in ["VPre", "VMPre"] and j < i: # XXX Only first ligcomp
self.buffer.merge_clusters(j, i + 1)
self.buffer.move_item(src=i, dest=j)
initial_reordering_syllable = {
"virama_terminated_cluster": reorder_syllable,
"sakot_terminated_cluster": reorder_syllable,
"standard_cluster": reorder_syllable,
"broken_cluster": reorder_syllable,
}
def setup_topographical_masks(self):
# Right now we don't actually send joining scripts through the USE
pass
def normalize_unicode_buffer(self):
unicodes = [item.codepoint for item in self.buffer.items]
newunicodes = []
for cp in unicodes:
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)
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