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|
use crate::context::Context;
use crate::error::RenderError;
use crate::helpers::{HelperDef, HelperResult};
use crate::json::value::JsonTruthy;
use crate::output::Output;
use crate::registry::Registry;
use crate::render::{Helper, RenderContext, Renderable};
#[derive(Clone, Copy)]
pub struct IfHelper {
positive: bool,
}
impl HelperDef for IfHelper {
fn call<'reg: 'rc, 'rc>(
&self,
h: &Helper<'reg, 'rc>,
r: &'reg Registry<'reg>,
ctx: &'rc Context,
rc: &mut RenderContext<'reg, 'rc>,
out: &mut dyn Output,
) -> HelperResult {
let param = h
.param(0)
.ok_or_else(|| RenderError::new("Param not found for helper \"if\""))?;
let include_zero = h
.hash_get("includeZero")
.and_then(|v| v.value().as_bool())
.unwrap_or(false);
let mut value = param.value().is_truthy(include_zero);
if !self.positive {
value = !value;
}
let tmpl = if value { h.template() } else { h.inverse() };
match tmpl {
Some(ref t) => t.render(r, ctx, rc, out),
None => Ok(()),
}
}
}
pub static IF_HELPER: IfHelper = IfHelper { positive: true };
pub static UNLESS_HELPER: IfHelper = IfHelper { positive: false };
#[cfg(test)]
mod test {
use crate::helpers::WITH_HELPER;
use crate::registry::Registry;
use serde_json::value::Value as Json;
use std::str::FromStr;
#[test]
fn test_if() {
let mut handlebars = Registry::new();
assert!(handlebars
.register_template_string("t0", "{{#if this}}hello{{/if}}")
.is_ok());
assert!(handlebars
.register_template_string("t1", "{{#unless this}}hello{{else}}world{{/unless}}")
.is_ok());
let r0 = handlebars.render("t0", &true);
assert_eq!(r0.ok().unwrap(), "hello".to_string());
let r1 = handlebars.render("t1", &true);
assert_eq!(r1.ok().unwrap(), "world".to_string());
let r2 = handlebars.render("t0", &false);
assert_eq!(r2.ok().unwrap(), "".to_string());
}
#[test]
fn test_if_context() {
let json_str = r#"{"a":{"b":99,"c":{"d": true}}}"#;
let data = Json::from_str(json_str).unwrap();
let mut handlebars = Registry::new();
handlebars.register_helper("with", Box::new(WITH_HELPER));
assert!(handlebars
.register_template_string("t0", "{{#if a.c.d}}hello {{a.b}}{{/if}}")
.is_ok());
assert!(handlebars
.register_template_string(
"t1",
"{{#with a}}{{#if c.d}}hello {{../a.b}}{{/if}}{{/with}}"
)
.is_ok());
let r0 = handlebars.render("t0", &data);
assert_eq!(r0.unwrap(), "hello 99".to_string());
let r1 = handlebars.render("t1", &data);
assert_eq!(r1.unwrap(), "hello 99".to_string());
}
#[test]
fn test_if_include_zero() {
use std::f64;
let handlebars = Registry::new();
assert_eq!(
"0".to_owned(),
handlebars
.render_template("{{#if a}}1{{else}}0{{/if}}", &json!({"a": 0}))
.unwrap()
);
assert_eq!(
"1".to_owned(),
handlebars
.render_template(
"{{#if a includeZero=true}}1{{else}}0{{/if}}",
&json!({"a": 0})
)
.unwrap()
);
assert_eq!(
"0".to_owned(),
handlebars
.render_template(
"{{#if a includeZero=true}}1{{else}}0{{/if}}",
&json!({ "a": f64::NAN })
)
.unwrap()
);
}
#[test]
fn test_invisible_line_stripping() {
let hbs = Registry::new();
assert_eq!(
"yes\n",
hbs.render_template("{{#if a}}\nyes\n{{/if}}\n", &json!({"a": true}))
.unwrap()
);
assert_eq!(
"x\ny",
hbs.render_template("{{#if a}}x{{/if}}\ny", &json!({"a": true}))
.unwrap()
);
assert_eq!(
"y\nz",
hbs.render_template("{{#if a}}\nx\n{{^}}\ny\n{{/if}}\nz", &json!({"a": false}))
.unwrap()
);
}
}
|
