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|
from collections import OrderedDict
from enum import IntEnum
import re
from youseedee import ucd_data
script_config = {
"Invalid": dict(
old_spec=False,
virama=0,
base_pos="last",
reph_pos="before_post",
reph_mode="implicit",
blwf_mode="pre_and_post",
),
"Devanagari": dict(
old_spec=True,
virama=0x094D,
base_pos="last",
reph_pos="before_post",
reph_mode="implicit",
blwf_mode="pre_and_post",
),
"Bengali": dict(
old_spec=True,
virama=0x09CD,
base_pos="last",
reph_pos="after_sub",
reph_mode="implicit",
blwf_mode="pre_and_post",
),
"Gurmukhi": dict(
old_spec=True,
virama=0x0A4D,
base_pos="last",
reph_pos="before_sub",
reph_mode="implicit",
blwf_mode="pre_and_post",
),
"Gujarati": dict(
old_spec=True,
virama=0x0ACD,
base_pos="last",
reph_pos="before_post",
reph_mode="implicit",
blwf_mode="pre_and_post",
),
"Oriya": dict(
old_spec=True,
virama=0x0B4D,
base_pos="last",
reph_pos="after_main",
reph_mode="implicit",
blwf_mode="pre_and_post",
),
"Tamil": dict(
old_spec=True,
virama=0x0BCD,
base_pos="last",
reph_pos="after_post",
reph_mode="implicit",
blwf_mode="pre_and_post",
),
"Telugu": dict(
old_spec=True,
virama=0x0C4D,
base_pos="last",
reph_pos="after_post",
reph_mode="explicit",
blwf_mode="post_only",
),
"Kannada": dict(
old_spec=True,
virama=0x0CCD,
base_pos="last",
reph_pos="after_post",
reph_mode="implicit",
blwf_mode="post_only",
),
"Malayalam": dict(
old_spec=True,
virama=0x0D4D,
base_pos="last",
reph_pos="after_main",
reph_mode="log_repha",
blwf_mode="pre_and_post",
),
"Sinhala": dict(
old_spec=False,
virama=0x0DCA,
base_pos="last_sinhala",
reph_pos="after_post",
reph_mode="explicit",
blwf_mode="pre_and_post",
),
}
# Go from UCD categories to the ones we care about
syllabic_category_map = {
"Other": "X",
"Avagraha": "Symbol",
"Bindu": "SM",
"Brahmi_Joining_Number": "PLACEHOLDER", # Don't care.
"Cantillation_Mark": "A",
"Consonant": "C",
"Consonant_Dead": "C",
"Consonant_Final": "CM",
"Consonant_Head_Letter": "C",
"Consonant_Killer": "M", # U+17CD only.
"Consonant_Medial": "CM",
"Consonant_Placeholder": "PLACEHOLDER",
"Consonant_Preceding_Repha": "Repha",
"Consonant_Prefixed": "X", # Don't care.
"Consonant_Subjoined": "CM",
"Consonant_Succeeding_Repha": "CM",
"Consonant_With_Stacker": "CS",
"Gemination_Mark": "SM", # https://github.com/harfbuzz/harfbuzz/issues/552
"Invisible_Stacker": "Coeng",
"Joiner": "ZWJ",
"Modifying_Letter": "X",
"Non_Joiner": "ZWNJ",
"Nukta": "N",
"Number": "PLACEHOLDER",
"Number_Joiner": "PLACEHOLDER", # Don't care.
"Pure_Killer": "M", # Is like a vowel matra.
"Register_Shifter": "RS",
"Syllable_Modifier": "SM",
"Tone_Letter": "X",
"Tone_Mark": "N",
"Virama": "H",
"Visarga": "SM",
"Vowel": "V",
"Vowel_Dependent": "M",
"Vowel_Independent": "V",
# The following come from reassignment
"Symbol": "Symbol",
"Ra": "Ra",
"Dotted_Circle": "DOTTEDCIRCLE",
}
## Set up the state machine for syllable matching and syllabic
## categories using composed regular expressions
states = OrderedDict(
c="C|Ra",
n="(ZWNJ?RS)?(N N?)?",
z="ZWJ|ZWNJ",
reph="Ra H|Repha",
cn="c ZWJ?n?",
forced_rakar="ZWJ H ZWJ Ra",
symbol="Symbol N?",
matra_group="z*M N?(H|forced_rakar)?",
syllable_tail="(z?SM SM?ZWNJ?)?A*",
halant_group="z?H(ZWJ N?)?",
final_halant_group="halant_group|H ZWNJ",
medial_group="CM?",
halant_or_matra_group="final_halant_group|matra_group*",
complex_syllable_tail="(halant_group cn)*medial_group halant_or_matra_group syllable_tail",
consonant_syllable="((Repha|CS)?cn complex_syllable_tail)",
vowel_syllable="(reph?V n?(complex_syllable_tail|ZWJ))",
standalone_cluster="((Repha|CS)?PLACEHOLDER|reph?DOTTEDCIRCLE)n? complex_syllable_tail",
symbol_cluster="symbol syllable_tail",
broken_cluster="reph? n? complex_syllable_tail",
)
def make_syllable_machine(states, additional_categories=[]):
categories = set(syllabic_category_map.values()) | set(additional_categories)
syllable_machine = {}
tail = r"\([^\)]+\)=\d+"
for value in categories:
syllable_machine[value] = f"<{value}>" + tail
syllable_machine["other"] = r"<[^\>]+>" + tail
for category, definition in states.items():
# Recursively replace any known states with their definitions:
states = (
"\\b("
+ "|".join(sorted(syllable_machine.keys(), key=len, reverse=True))
+ ")\\b"
)
definition = re.sub(
states, lambda match: "(" + syllable_machine[match[1]] + ")", definition
)
definition = definition.replace(" ", "")
syllable_machine[category] = definition
return syllable_machine
syllable_machine_indic = make_syllable_machine(states)
class IndicPosition(IntEnum):
START = 0
RA_TO_BECOME_REPH = 1
PRE_M = 2
PRE_C = 3
BASE_C = 4
AFTER_MAIN = 5
ABOVE_C = 6
BEFORE_SUB = 7
BELOW_C = 8
AFTER_SUB = 9
BEFORE_POST = 10
POST_C = 11
AFTER_POST = 12
FINAL_C = 13
SMVD = 14
END = 15
def is_ra(u):
return u in [
0x0930,
0x09B0,
0x09F0,
0x0A30,
0x0AB0,
0x0B30,
0x0BB0,
0x0C30,
0x0CB0,
0x0D30,
0x0DBB,
0x179A,
]
def IndicPositionalCategory2IndicPosition(ipc):
if ipc == "Left":
return IndicPosition.PRE_C
if ipc == "Top":
return IndicPosition.ABOVE_C
if ipc == "Bottom":
return IndicPosition.BELOW_C
if ipc == "Right":
return IndicPosition.POST_C
if ipc == "Bottom_And_Right":
return IndicPosition.POST_C
if ipc == "Left_And_Right":
return IndicPosition.POST_C
if ipc == "Top_And_Bottom_And_Left":
return IndicPosition.POST_C
if ipc == "Top_And_Bottom":
return IndicPosition.BELOW_C
if ipc == "Top_And_Bottom_And_Left":
return IndicPosition.BELOW_C
if ipc == "Top_And_Bottom_And_Right":
return IndicPosition.POST_C
if ipc == "Top_And_Left":
return IndicPosition.ABOVE_C
if ipc == "Top_And_Left_And_Right":
return IndicPosition.POST_C
if ipc == "Top_And_Right":
return IndicPosition.POST_C
if ipc == "Overstruck":
return IndicPosition.AFTER_MAIN
if ipc == "Visual_Order_Left":
return IndicPosition.PRE_M
return IndicPosition.END
matra_pos_left = {"Default": IndicPosition.PRE_M}
matra_pos_right = {
# Telu and Knda need special cases
"Devanagari": IndicPosition.AFTER_SUB,
"Bengali": IndicPosition.AFTER_POST,
"Gurmukhi": IndicPosition.AFTER_POST,
"Gujarati": IndicPosition.AFTER_POST,
"Oriya": IndicPosition.AFTER_POST,
"Tamil": IndicPosition.AFTER_POST,
"Malayalam": IndicPosition.AFTER_POST,
"Default": IndicPosition.AFTER_SUB,
}
matra_pos_top = {
"Devanagari": IndicPosition.AFTER_SUB,
"Gurmukhi": IndicPosition.AFTER_POST,
"Gujarati": IndicPosition.AFTER_SUB,
"Oriya": IndicPosition.AFTER_MAIN,
"Tamil": IndicPosition.AFTER_SUB,
"Telugu": IndicPosition.BEFORE_SUB,
"Kannada": IndicPosition.BEFORE_SUB,
"Sinhala": IndicPosition.AFTER_SUB,
"Default": IndicPosition.AFTER_SUB,
}
matra_pos_bottom = {
"Devanagari": IndicPosition.AFTER_SUB,
"Bengali": IndicPosition.AFTER_SUB,
"Gurmukhi": IndicPosition.AFTER_POST,
"Gujarati": IndicPosition.AFTER_POST,
"Oriya": IndicPosition.AFTER_SUB,
"Tamil": IndicPosition.AFTER_POST,
"Telugu": IndicPosition.BEFORE_SUB,
"Malayalam": IndicPosition.AFTER_POST,
"Sinhala": IndicPosition.AFTER_SUB,
"Default": IndicPosition.AFTER_SUB,
}
def set_matra_position(item):
script = ucd_data(item.codepoint)["Script"]
u = item.codepoint
if item.syllabic_position == IndicPosition.PRE_C:
selector = matra_pos_left
elif item.syllabic_position == IndicPosition.POST_C:
selector = matra_pos_right
if script == "Telugu":
if u <= 0x0C42:
item.syllabic_position = IndicPosition.BEFORE_SUB
else:
item.syllabic_position = IndicPosition.AFTER_SUB
return
if script == "Kannada":
if u < 0x0CC3 or u > 0xCD6:
item.syllabic_position = IndicPosition.BEFORE_SUB
else:
item.syllabic_position = IndicPosition.AFTER_SUB
return
elif item.syllabic_position == IndicPosition.ABOVE_C:
selector = matra_pos_top
elif item.syllabic_position == IndicPosition.BELOW_C:
selector = matra_pos_bottom
else:
return
item.syllabic_position = selector.get(script, selector["Default"])
def reassign_category_and_position_indic(item):
cp = item.codepoint
if 0x0953 <= cp <= 0x0954:
item.syllabic_category = "SM"
elif 0x0A72 <= cp <= 0x0A73 or 0x1CF5 <= cp <= 0x1CF6:
item.syllabic_category = "C"
elif 0x1CE2 <= cp <= 0x1CE8 or cp == 0x1CED:
item.syllabic_category = "A"
elif 0xA8F2 <= cp <= 0xA8F7 or 0x1CE9 <= cp <= 0x1CEC or 0x1CEE <= cp <= 0x1CF1:
item.syllabic_category = "Symbol"
elif cp == 0x0A51: # https://github.com/harfbuzz/harfbuzz/issues/524
item.syllabic_category = "M"
item.syllabic_position = IndicPosition.BELOW_C
elif cp == 0x11301 or cp == 0x11303:
item.syllabic_category = "SM"
elif cp == 0x1133B or cp == 0x1133C:
item.syllabic_category = "N"
elif cp == 0x0AFB:
item.syllabic_category = "N"
elif cp == 0x0980 or cp == 0x09FC or cp == 0x0C80 or cp == 0x2010 or cp == 0x2011:
item.syllabic_category = "PLACEHOLDER"
elif cp == 0x25CC:
item.syllabic_category = "DOTTEDCIRCLE"
isc = item.syllabic_category
is_medial = isc == "CM"
is_consonant = (
isc in ["C", "CS", "Ra", "V", "PLACEHOLDER", "DOTTEDCIRCLE"] or is_medial
)
if is_consonant:
item.syllabic_position = IndicPosition.BASE_C
if is_ra(cp):
item.syllabic_category = "Ra"
elif isc == "M":
set_matra_position(item)
elif isc in ["SM", "A", "Symbol"]:
item.syllabic_position = IndicPosition.SMVD
if cp == 0x0B01:
item.syllabic_position = IndicPosition.BEFORE_SUB
|
