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use crate::{
error::HelperError,
helper::{Helper, HelperValue},
parser::ast::Node,
render::{Context, Render, Type},
};
pub struct Lookup;
impl Helper for Lookup {
fn call<'render, 'call>(
&self,
_rc: &mut Render<'render>,
ctx: &Context<'call>,
_template: Option<&'render Node<'render>>,
) -> HelperValue {
ctx.arity(2..2)?;
let target = ctx.get(0).unwrap();
let field = ctx.try_get(1, &[Type::String]).unwrap().as_str().unwrap();
if let Some(result) = ctx.lookup(&target, field).cloned() {
Ok(Some(result))
} else {
Err(HelperError::LookupField(
ctx.name().to_string(),
field.to_string(),
))
}
}
}