boa_engine 0.17.0

Boa is a Javascript lexer, parser and compiler written in Rust. Currently, it has support for some of the language.
Documentation 
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use std::fmt::Display;

use crate::builtins::intl::options::OptionTypeParsable;

#[derive(Debug, Clone, Copy, Default)]
pub(crate) enum Granularity {
    #[default]
    Grapheme,
    Word,
    Sentence,
}

impl Display for Granularity {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Grapheme => "grapheme",
            Self::Word => "word",
            Self::Sentence => "sentence",
        }
        .fmt(f)
    }
}

#[derive(Debug)]
pub(crate) struct ParseGranularityError;

impl Display for ParseGranularityError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str("provided string was not `grapheme`, `word` or `sentence`")
    }
}

impl std::str::FromStr for Granularity {
    type Err = ParseGranularityError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "grapheme" => Ok(Self::Grapheme),
            "word" => Ok(Self::Word),
            "sentence" => Ok(Self::Sentence),
            _ => Err(ParseGranularityError),
        }
    }
}

impl OptionTypeParsable for Granularity {}