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use serde_json::value::Value as Json;
use crate::context::Context;
use crate::error::RenderError;
use crate::helpers::HelperDef;
use crate::json::value::ScopedJson;
use crate::registry::Registry;
use crate::render::{Helper, RenderContext};
#[derive(Clone, Copy)]
pub struct LookupHelper;
impl HelperDef for LookupHelper {
fn call_inner<'reg: 'rc, 'rc>(
&self,
h: &Helper<'reg, 'rc>,
r: &'reg Registry<'reg>,
_: &'rc Context,
_: &mut RenderContext<'reg, 'rc>,
) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
let collection_value = h
.param(0)
.ok_or_else(|| RenderError::new("Param not found for helper \"lookup\""))?;
let index = h
.param(1)
.ok_or_else(|| RenderError::new("Insufficient params for helper \"lookup\""))?;
let value = match *collection_value.value() {
Json::Array(ref v) => index
.value()
.as_u64()
.and_then(|u| v.get(u as usize))
.unwrap_or(&Json::Null),
Json::Object(ref m) => index
.value()
.as_str()
.and_then(|k| m.get(k))
.unwrap_or(&Json::Null),
_ => &Json::Null,
};
if r.strict_mode() && value.is_null() {
Err(RenderError::strict_error(None))
} else {
Ok(value.clone().into())
}
}
}
pub static LOOKUP_HELPER: LookupHelper = LookupHelper;
#[cfg(test)]
mod test {
use crate::registry::Registry;
#[test]
fn test_lookup() {
let mut handlebars = Registry::new();
assert!(handlebars
.register_template_string("t0", "{{#each v1}}{{lookup ../v2 @index}}{{/each}}")
.is_ok());
assert!(handlebars
.register_template_string("t1", "{{#each v1}}{{lookup ../v2 1}}{{/each}}")
.is_ok());
assert!(handlebars
.register_template_string("t2", "{{lookup kk \"a\"}}")
.is_ok());
let m = json!({"v1": [1,2,3], "v2": [9,8,7]});
let m2 = json!({
"kk": {"a": "world"}
});
let r0 = handlebars.render("t0", &m);
assert_eq!(r0.ok().unwrap(), "987".to_string());
let r1 = handlebars.render("t1", &m);
assert_eq!(r1.ok().unwrap(), "888".to_string());
let r2 = handlebars.render("t2", &m2);
assert_eq!(r2.ok().unwrap(), "world".to_string());
}
#[test]
fn test_strict_lookup() {
let mut hbs = Registry::new();
assert_eq!(
hbs.render_template("{{lookup kk 1}}", &json!({"kk": []}))
.unwrap(),
""
);
hbs.set_strict_mode(true);
assert!(hbs
.render_template("{{lookup kk 1}}", &json!({"kk": []}))
.is_err());
}
}
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