use std::collections::BTreeMap;
use std::iter::FromIterator;
use registry::Registry;
use render::{RenderError, RenderContext, Directive, Evaluable, Renderable};
pub fn expand_partial(d: &Directive,
r: &Registry,
rc: &mut RenderContext)
-> Result<(), RenderError> {
if let Some(t) = d.template() {
try!(t.eval(r, rc));
}
if rc.is_current_template(d.name()) {
return Err(RenderError::new("Cannot include self in >"));
}
let tname = d.name();
let partial = rc.get_partial(tname);
let render_template = partial.as_ref().or(r.get_template(tname)).or(d.template());
match render_template {
Some(t) => {
let context_param = d.params().get(0).and_then(|p| p.path());
let old_path = context_param.map(|p| {
let old_path = rc.get_path().clone();
rc.promote_local_vars();
let new_path = format!("{}/{}", old_path, p);
rc.set_path(new_path);
old_path
});
if let Some(t) = d.template() {
rc.set_partial("@partial-block".to_string(), t.clone());
}
let hash = d.hash();
let r = if hash.is_empty() {
t.render(r, rc)
} else {
let hash_ctx = BTreeMap::from_iter(hash.iter()
.map(|(k, v)| {
(k.clone(), v.value().clone())
}));
let mut local_rc = rc.derive();
{
let mut ctx_ref = local_rc.context_mut();
*ctx_ref = ctx_ref.extend(&hash_ctx);
}
t.render(r, &mut local_rc)
};
if let Some(path) = old_path {
rc.set_path(path);
rc.demote_local_vars();
}
r
}
None => Ok(()),
}
}
#[cfg(test)]
mod test {
use registry::Registry;
#[test]
fn test() {
let mut handlebars = Registry::new();
assert!(handlebars.register_template_string("t0", "{{> t1}}").is_ok());
assert!(handlebars.register_template_string("t1", "{{this}}").is_ok());
assert!(handlebars.register_template_string("t2", "{{#> t99}}not there{{/t99}}").is_ok());
assert!(handlebars.register_template_string("t3", "{{#*inline \"t31\"}}{{this}}{{/inline}}{{> t31}}").is_ok());
assert!(handlebars.register_template_string("t4", "{{#> t5}}{{#*inline \"nav\"}}navbar{{/inline}}{{/t5}}").is_ok());
assert!(handlebars.register_template_string("t5", "include {{> nav}}").is_ok());
assert!(handlebars.register_template_string("t6", "{{> t1 a}}").is_ok());
assert!(handlebars.register_template_string("t7", "{{#*inline \"t71\"}}{{a}}{{/inline}}{{> t71 a=\"world\"}}").is_ok());
assert!(handlebars.register_template_string("t8", "{{a}}").is_ok());
assert!(handlebars.register_template_string("t9", "{{> t8 a=2}}").is_ok());
assert_eq!(handlebars.render("t0", &1).ok().unwrap(), "1".to_string());
assert_eq!(handlebars.render("t2", &1).ok().unwrap(),
"not there".to_string());
assert_eq!(handlebars.render("t3", &1).ok().unwrap(), "1".to_string());
assert_eq!(handlebars.render("t4", &1).ok().unwrap(),
"include navbar".to_string());
assert_eq!(handlebars.render("t6", &btreemap!{"a".to_string() => "2".to_string()})
.ok()
.unwrap(),
"2".to_string());
assert_eq!(handlebars.render("t7", &1).ok().unwrap(),
"world".to_string());
assert_eq!(handlebars.render("t9", &1).ok().unwrap(), "2".to_string());
}
#[test]
fn test_include_partial_block() {
let t0 = "hello {{> @partial-block}}";
let t1 = "{{#> t0}}inner {{this}}{{/t0}}";
let mut handlebars = Registry::new();
assert!(handlebars.register_template_string("t0", t0).is_ok());
assert!(handlebars.register_template_string("t1", t1).is_ok());
let r0 = handlebars.render("t1", &true);
assert_eq!(r0.ok().unwrap(), "hello inner true".to_string());
}
}