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::dimensions::numeral::helpers::numeral_data;
use crate::dimensions::time_grain::Grain;
use crate::pattern::{dim, predicate, regex};
use crate::types::{DimensionKind, Rule, TokenData};

use super::DurationData;

fn is_natural(td: &TokenData) -> bool {
    matches!(td, TokenData::Numeral(d) if d.value > 0.0 && d.value.fract()==0.0)
}

pub fn rules() -> Vec<Rule> {
    vec![
        Rule {
            name: "half an hour".to_string(),
            pattern: vec![regex("(1/2|en halv) timme")],
            production: Box::new(|_| {
                Some(TokenData::Duration(DurationData::new(30, Grain::Minute)))
            }),
        },
        Rule {
            name: "<integer> more <unit-of-duration>".to_string(),
            pattern: vec![
                predicate(is_natural),
                dim(DimensionKind::TimeGrain),
                regex("fler|mer"),
            ],
            production: Box::new(|n| {
                let v = numeral_data(&n[0].token_data)?.value as i64;
                let g = match &n[1].token_data {
                    TokenData::TimeGrain(g) => *g,
                    _ => return None,
                };
                Some(TokenData::Duration(DurationData::new(v, g)))
            }),
        },
        Rule {
            name: "number.number hours".to_string(),
            pattern: vec![regex("(\\d+)\\,(\\d+)"), regex("timm(e|ar)?")],
            production: Box::new(|n| {
                let m = match &n[0].token_data {
                    TokenData::RegexMatch(m) => m,
                    _ => return None,
                };
                let hh: i64 = m.group(1)?.parse().ok()?;
                let frac = m.group(2)?;
                let num: i64 = frac.parse().ok()?;
                let den: i64 = 10_i64.pow(frac.len() as u32);
                Some(TokenData::Duration(DurationData::new(
                    60_i64
                        .checked_mul(hh)?
                        .checked_add(num.checked_mul(60)?.checked_div(den)?)?,
                    Grain::Minute,
                )))
            }),
        },
        Rule {
            name: "<integer> and an half hours".to_string(),
            pattern: vec![predicate(is_natural), regex("och (en )?halv timme?")],
            production: Box::new(|n| {
                let v = numeral_data(&n[0].token_data)?.value as i64;
                Some(TokenData::Duration(DurationData::new(
                    60_i64.checked_mul(v)?.checked_add(30)?,
                    Grain::Minute,
                )))
            }),
        },
        Rule {
            name: "a <unit-of-duration>".to_string(),
            pattern: vec![regex("en|ett?"), dim(DimensionKind::TimeGrain)],
            production: Box::new(|n| {
                let g = match &n[1].token_data {
                    TokenData::TimeGrain(g) => *g,
                    _ => return None,
                };
                Some(TokenData::Duration(DurationData::new(1, g)))
            }),
        },
        Rule {
            name: "about <duration>".to_string(),
            pattern: vec![
                regex("(omkring|cirka|ca\\.?|c:a|runt|ungefär)"),
                dim(DimensionKind::Duration),
            ],
            production: Box::new(|n| Some(n[1].token_data.clone())),
        },
        Rule {
            name: "exactly <duration>".to_string(),
            pattern: vec![regex("(precis|exakt)"), dim(DimensionKind::Duration)],
            production: Box::new(|n| Some(n[1].token_data.clone())),
        },
    ]
}