zino-core 0.43.1

Core types and traits for zino.
Documentation 
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use crate::{
    JsonValue,
    datetime::{self, DateTime},
    extension::TomlTableExt,
};
use smallvec::SmallVec;
use toml::Table;

/// Model field translations.
#[derive(Default, Debug, Clone)]
pub struct Translation<'a> {
    /// Mappings.
    mappings: SmallVec<[(&'a str, &'a str); 8]>,
}

impl<'a> Translation<'a> {
    /// Creates a new instance.
    #[inline]
    pub fn new() -> Self {
        Self {
            mappings: SmallVec::new(),
        }
    }

    /// Creates a new instance with the configuration.
    pub fn with_config(config: &'a Table) -> Self {
        let Some(translations) = config.get_array("translations") else {
            return Self::default();
        };
        let mappings = translations
            .iter()
            .filter_map(|v| v.as_array())
            .filter_map(|v| {
                if let [v0, v1, ..] = v.as_slice() {
                    v0.as_str().zip(v1.as_str())
                } else {
                    None
                }
            })
            .collect();
        Self { mappings }
    }

    /// Inserts a mapping.
    #[inline]
    pub fn insert_mapping(&mut self, raw_value: &'a str, mapping_value: &'a str) {
        self.mappings.push((raw_value, mapping_value));
    }

    /// Translates the value.
    pub fn translate(&self, value: &JsonValue) -> Option<JsonValue> {
        match value {
            JsonValue::String(s) if !s.is_empty() => self.mappings.iter().find_map(|(k, v)| {
                if let Some(duration) = k.strip_prefix("$span:") {
                    let Ok(duration) = datetime::parse_duration(duration) else {
                        return None;
                    };
                    let Ok(dt) = s.parse::<DateTime>() else {
                        return None;
                    };
                    (dt.span_between_now() <= duration).then_some((*v).into())
                } else {
                    (k == s).then_some((*v).into())
                }
            }),
            JsonValue::Array(vec) if !vec.is_empty() => {
                let values = vec
                    .iter()
                    .map(|v| self.translate(v).unwrap_or_default())
                    .collect::<Vec<_>>();
                Some(values.into())
            }
            _ => None,
        }
    }

    /// Returns `true` if the translation is ready for use.
    #[inline]
    pub fn is_ready(&self) -> bool {
        !self.mappings.is_empty()
    }
}