duckling 0.4.0

A Rust port of Facebook's Duckling library for parsing natural language into structured data
Documentation 
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use crate::pattern::{dim, regex};
use crate::types::{DimensionKind, Rule, TokenData};

use super::{DistanceData, DistanceUnit};

fn distance_data(td: &TokenData) -> Option<&DistanceData> {
    if let TokenData::Distance(d) = td {
        Some(d)
    } else {
        None
    }
}

pub fn rules() -> Vec<Rule> {
    vec![
        Rule {
            name: "<latent dist> km".to_string(),
            pattern: vec![dim(DimensionKind::Distance), regex("k(ilo)?m?(eter)?")],
            production: Box::new(|n| {
                let d = distance_data(&n[0].token_data)?;
                Some(TokenData::Distance(
                    d.clone().with_unit(DistanceUnit::Kilometre),
                ))
            }),
        },
        Rule {
            name: "<dist> meter".to_string(),
            pattern: vec![dim(DimensionKind::Distance), regex("m(eter)?")],
            production: Box::new(|n| {
                let d = distance_data(&n[0].token_data)?;
                Some(TokenData::Distance(
                    d.clone().with_unit(DistanceUnit::Metre),
                ))
            }),
        },
        Rule {
            name: "<dist> centimeters".to_string(),
            pattern: vec![dim(DimensionKind::Distance), regex("cm|centimeter")],
            production: Box::new(|n| {
                let d = distance_data(&n[0].token_data)?;
                Some(TokenData::Distance(
                    d.clone().with_unit(DistanceUnit::Centimetre),
                ))
            }),
        },
        Rule {
            name: "<dist> mils".to_string(),
            pattern: vec![dim(DimensionKind::Distance), regex("mils?")],
            production: Box::new(|n| {
                let d = distance_data(&n[0].token_data)?;
                let x = d.value?;
                Some(TokenData::Distance(DistanceData::new(
                    x * 10.0,
                    DistanceUnit::Kilometre,
                )))
            }),
        },
    ]
}