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extern crate handlebars;
#[macro_use]
extern crate serde_json;
use std::sync::atomic::{AtomicU16, Ordering};
use std::sync::Arc;
use handlebars::{Context, Handlebars, Helper, HelperDef, RenderContext, RenderError, ScopedJson};
#[test]
fn test_subexpression() {
let hbs = Handlebars::new();
let data = json!({"a": 1, "b": 0, "c": 2});
assert_eq!(
hbs.render_template("{{#if (gt a b)}}Success{{else}}Failed{{/if}}", &data)
.unwrap(),
"Success"
);
assert_eq!(
hbs.render_template("{{#if (gt a c)}}Success{{else}}Failed{{/if}}", &data)
.unwrap(),
"Failed"
);
assert_eq!(
hbs.render_template("{{#if (not (gt a c))}}Success{{else}}Failed{{/if}}", &data)
.unwrap(),
"Success"
);
assert_eq!(
hbs.render_template("{{#if (not (gt a b))}}Success{{else}}Failed{{/if}}", &data)
.unwrap(),
"Failed"
);
// no argument provided for not
assert!(hbs
.render_template("{{#if (not)}}Success{{else}}Failed{{/if}}", &data)
.is_err());
// json literal
assert_eq!(
hbs.render_template("{{#if (not true)}}Success{{else}}Failed{{/if}}", &data)
.unwrap(),
"Failed"
);
assert_eq!(
hbs.render_template("{{#if (not false)}}Success{{else}}Failed{{/if}}", &data)
.unwrap(),
"Success"
);
}
#[test]
fn test_strict_mode() {
let mut hbs = Handlebars::new();
hbs.set_strict_mode(true);
let data = json!({"a": 1});
assert!(hbs
.render_template("{{#if (eq a 1)}}Success{{else}}Failed{{/if}}", &data)
.is_ok());
assert!(hbs
.render_template("{{#if (eq z 1)}}Success{{else}}Failed{{/if}}", &data)
.is_err())
}
#[test]
fn invalid_json_path() {
// The data here is not important
let data = &Vec::<()>::new();
let hbs = Handlebars::new();
let error = hbs.render_template("{{x[]@this}}", &data).unwrap_err();
let expected = "Error rendering \"Unnamed template\" line 1, col 1: Helper not defined: \"x\"";
assert_eq!(format!("{}", error), expected);
}
struct MyHelper;
impl HelperDef for MyHelper {
fn call_inner<'reg: 'rc, 'rc>(
&self,
_: &Helper<'reg, 'rc>,
_: &'reg Handlebars,
_: &'rc Context,
_: &mut RenderContext<'reg, 'rc>,
) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
Ok(ScopedJson::Derived(json!({
"a": 1,
"b": 2,
})))
}
}
#[test]
fn test_lookup_with_subexpression() {
let mut registry = Handlebars::new();
registry.register_helper("myhelper", Box::new(MyHelper {}));
registry
.register_template_string("t", "{{ lookup (myhelper) \"a\" }}")
.unwrap();
let result = registry.render("t", &json!({})).unwrap();
assert_eq!("1", result);
}
struct CallCounterHelper {
pub(crate) c: Arc<AtomicU16>,
}
impl HelperDef for CallCounterHelper {
fn call_inner<'reg: 'rc, 'rc>(
&self,
h: &Helper<'reg, 'rc>,
_: &'reg Handlebars,
_: &'rc Context,
_: &mut RenderContext<'reg, 'rc>,
) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
// inc counter
self.c.fetch_add(1, Ordering::SeqCst);
if let Some(_) = h.param(0) {
Ok(json!({
"a": 1,
})
.into())
} else {
Ok(json!(null).into())
}
}
}
#[test]
fn test_helper_call_count() {
let mut registry = Handlebars::new();
let counter = Arc::new(AtomicU16::new(0));
let helper = Box::new(CallCounterHelper { c: counter.clone() });
registry.register_helper("myhelper", helper);
registry
.render_template(
"{{#if (myhelper a)}}something{{else}}nothing{{/if}}",
&json!(null),
) // If returns true
.unwrap();
assert_eq!(1, counter.load(Ordering::SeqCst));
registry
.render_template(
"{{#if (myhelper)}}something{{else}}nothing{{/if}}",
&json!(null),
) // If returns false
.unwrap();
assert_eq!(2, counter.load(Ordering::SeqCst));
}
|
