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from pathlib import Path
from typing import Iterable
from typing import List
from typing import Union
from typeguard import check_argument_types
from espnet2.text.abs_tokenizer import AbsTokenizer
class CharTokenizer(AbsTokenizer):
def __init__(
self,
non_linguistic_symbols: Union[Path, str, Iterable[str]] = None,
space_symbol: str = "<space>",
remove_non_linguistic_symbols: bool = False,
):
assert check_argument_types()
self.space_symbol = space_symbol
if non_linguistic_symbols is None:
self.non_linguistic_symbols = set()
elif isinstance(non_linguistic_symbols, (Path, str)):
non_linguistic_symbols = Path(non_linguistic_symbols)
with non_linguistic_symbols.open("r", encoding="utf-8") as f:
self.non_linguistic_symbols = set(line.rstrip() for line in f)
else:
self.non_linguistic_symbols = set(non_linguistic_symbols)
self.remove_non_linguistic_symbols = remove_non_linguistic_symbols
def __repr__(self):
return (
f"{self.__class__.__name__}("
f'space_symbol="{self.space_symbol}"'
f'non_linguistic_symbols="{self.non_linguistic_symbols}"'
f")"
)
def text2tokens(self, line: str) -> List[str]:
tokens = []
while len(line) != 0:
for w in self.non_linguistic_symbols:
if line.startswith(w):
if not self.remove_non_linguistic_symbols:
tokens.append(line[: len(w)])
line = line[len(w) :]
break
else:
t = line[0]
if t == " ":
t = "<space>"
tokens.append(t)
line = line[1:]
return tokens
def tokens2text(self, tokens: Iterable[str]) -> str:
tokens = [t if t != self.space_symbol else " " for t in tokens]
return "".join(tokens)
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