"""Converts legacy encodings into Unicode.
TODO: Rm regex dependency
TODO: Add tests
"""
from typing import Optional, Pattern
from unicodedata import normalize
import regex # type: ignore
# pylint: disable=anomalous-backslash-in-string
BETA_REPLACE: list[tuple[str, str]] = [
(r"S|\*[sS]", "Σ"),
(r"B|\*[bB]", "Β"),
(r"G|\*[gG]", "Γ"),
(r"D|\*[dD]", "Δ"),
(r"Z|\*[zZ]", "Ζ"),
(r"Q|\*[qQ]", "Θ"),
(r"K|\*[kK]", "Κ"),
(r"L|\*[lL]", "Λ"),
(r"M|\*[mM]", "Μ"),
(r"N|\*[nN]", "Ν"),
(r"C|\*[cC]", "Ξ"),
(r"P|\*[pP]", "Π"),
(r"R|\*[rR]", "Ρ"),
(r"T|\*[tT]", "Τ"),
(r"Y|\*[yY]", "Ψ"),
(r"X|\*[xX]", "Χ"),
(r"F|\*[fF]", "Φ"),
(r"A|\*[aA]", "Α"),
(r"E|\*[eE]", "Ε"),
(r"H|\*[hH]", "Η"),
(r"I|\*[iI]", "Ι"),
(r"O|\*[oO]", "Ο"),
(r"U|\*[uU]", "Υ"),
(r"W|\*[wW]", "Ω"),
(r"s([ ,.;])", r"ς\1"),
(r"s\Z", r"ς"),
(r"s", "σ"),
(r"b", "β"),
(r"g", "γ"),
(r"d", "δ"),
(r"z", "ζ"),
(r"q", "θ"),
(r"k", "κ"),
(r"l", "λ"),
(r"m", "μ"),
(r"n", "ν"),
(r"c", "ξ"),
(r"p", "π"),
(r"t", "τ"),
(r"y", "ψ"),
(r"x", "χ"),
(r"f", "φ"),
(r"r", "ρ"),
(r"a", "α"),
(r"e", "ε"),
(r"h", "η"),
(r"i", "ι"),
(r"o", "ο"),
(r"u", "υ"),
(r"w", "ω"),
(r"σ3", "\u03f2"),
(r"Σ3", "\u03f9"),
# fixed σ
(r"σ2", "σ"),
# koppa
(r"\*#2", "\u03de"),
(r"#2", "\u03df"),
# koppa (archaic)
(r"\*#3", "\u03d8"),
(r"#3", "\u03d9"),
# sampi
(r"\*#4", "\u03e0"),
(r"#4", "\u03e1"),
# Diacritics
# breathings
(r"\)", "\u0313"),
(r"\(", "\u0314"),
(r"\+", "\u0308"),
# accents
(r"\\", "\u0300"),
(r"\/", "\u0301"),
(r"=", "\u0342"),
# subscript iota
(r"\|", "\u0345"),
# dot below
(r"\?", "\u0323"),
# breve
(r"%27", "\u0306"),
# longa / macron
(r"%26", "\u0304"),
# Punctuation
# middle dot
(r":", "\u00b7"),
(r"'", "\u02bc"),
]
BETA_REORDER: list[tuple[str, str]] = [
# Brings breathings and diairesis first, then accents, then subscript iota
(r"([\\/=])(\|)?([()+])?", r"\3\1\2"),
# Makes sure the upper case marking is followed by the letter and only then
# the diacritics markers come
(r"\A(\*)?([()+])?([\\/=])?(\|)?(\w)", r"\1\5\2\3\4"),
]
[docs]class BetaCodeReplacer:
"""Replace Beta Code with Unicode.
>>> from cltk.alphabet.grc.beta_to_unicode import BetaCodeReplacer
>>> beta_code_replace = BetaCodeReplacer()
>>> beta_code_str = "O(/PWS OU)=N MH\ TAU)TO\ "
>>> beta_code_replace.replace_beta_code(beta_code_str)
'ὅπως οὖν μὴ ταὐτὸ '
>>> beta_code_str = "PROU+POTETAGME/NWN"
>>> beta_code_replace.replace_beta_code(beta_code_str)
'προϋποτεταγμένων'
"""
def __init__(
self,
pattern=Optional[list[tuple[str, str]]],
reorder_pattern=Optional[list[tuple[str, str]]],
):
if not pattern:
pattern = BETA_REPLACE
if not reorder_pattern:
reorder_pattern = BETA_REORDER
self.pattern: list[tuple[Pattern, str]] = [
(regex.compile(beta_regex, flags=regex.VERSION1), repl)
for (beta_regex, repl) in pattern
]
self.reorder_pattern: list[tuple[Pattern, str]] = [
(regex.compile(beta_regex, flags=regex.VERSION1), repl)
for (beta_regex, repl) in reorder_pattern
]
[docs] def replace_beta_code(self, text: str) -> str:
"""Replace method. Note: regex.subn() returns a tuple (new_string,
number_of_subs_made).
>>> from cltk.alphabet.grc.beta_to_unicode import BetaCodeReplacer
>>> beta_code_replace = BetaCodeReplacer()
>>> beta_code_str = r"*XALDAI+KH\\N" # extra slash in ``\\N`` only here for doctest
>>> beta_code_replace.replace_beta_code(beta_code_str)
'Χαλδαϊκὴν'
>>> beta_code_str = "proi+sxome/nwn"
>>> beta_code_replace.replace_beta_code(beta_code_str)
'προϊσχομένων'
"""
# Accounts for cases in which the whole string is upper case, leaving only
# the uppers marked by asterisks
if text.isupper():
text = regex.sub(r"(?<!\*)([A-Z]+)", lambda pat: pat.group(1).lower(), text)
text = text.replace("-", "")
for pattern, repl in self.reorder_pattern:
text = pattern.subn(repl, text)[0]
for pattern, repl in self.pattern:
text = pattern.subn(repl, text)[0]
return normalize("NFC", text)