jdrouet/mrml

use super::MjFontAttributes;
use crate::prelude::json::JsonAttributes;

impl MjFontAttributes {
    pub fn is_empty(&self) -> bool {
        self.name.is_empty() && self.href.is_empty()
    }
}

impl JsonAttributes for MjFontAttributes {
    fn has_attributes(&self) -> bool {
        !self.name.is_empty() || !self.href.is_empty()
    }

    fn try_from_serde<Err: serde::de::Error>(this: Option<Self>) -> Result<Self, Err>
    where
        Self: Sized,
    {
        this.ok_or_else(|| serde::de::Error::missing_field("attributes"))
    }
}

#[cfg(test)]
mod tests {
    use crate::mj_font::{MjFont, MjFontAttributes};

    #[test]
    fn serialize() {
        let elt = MjFont::new(
            MjFontAttributes {
                name: "Comic".to_string(),
                href: "somewhere".to_string(),
            },
            (),
        );
        assert_eq!(
            serde_json::to_string(&elt).unwrap(),
            r#"{"type":"mj-font","attributes":{"name":"Comic","href":"somewhere"}}"#
        );
    }

    #[test]
    fn deserialize() {
        let elt = MjFont::new(
            MjFontAttributes {
                name: "Comic".to_string(),
                href: "somewhere".to_string(),
            },
            (),
        );
        let json = serde_json::to_string(&elt).unwrap();
        let res: MjFont = serde_json::from_str(&json).unwrap();
        assert_eq!(res.name(), elt.name());
        assert_eq!(res.href(), elt.href());
    }

    #[test]
    fn deserialize_missing_field() {
        let json = r#"{"type":"mj-font","attributes":{"name":"Comic"}}"#.to_string();
        assert!(serde_json::from_str::<MjFont>(&json).is_err());
    }
}