use anyhow::Result;
use super::modifier::Modifier;
use super::modifier::ModifierKey;
use super::modifier::invert;
use crate::models::context::ContextModel;
pub struct EmptyModifier;
impl Modifier for EmptyModifier {
fn key(&self) -> ModifierKey {
ModifierKey::Empty
}
fn apply(&self, value: &ContextModel, arg: &str) -> Result<ContextModel> {
let invert_flag = arg == "not";
let result = match value {
ContextModel::String(s) => ContextModel::String(s.is_empty().to_string()),
ContextModel::List(items) => {
let results: Vec<String> = items.iter().map(|i| i.is_empty().to_string()).collect();
ContextModel::List(results)
}
};
if invert_flag {
Ok(invert(result))
} else {
Ok(result)
}
}
}