Struct IfEmptyHelper

pub struct IfEmptyHelper;

Call the template if an empty or whitespaces string is passed as parameter

assert_eq!(
  exec_template(json!({"a": 42}), "{{#if_empty a}}OK{{else}}NOK{{/if_empty}}"),
  "NOK"
);
assert_eq!(
  exec_template(json!({}), "{{#if_empty \"42\"}}OK{{else}}NOK{{/if_empty}}"),
  "NOK"
);
assert_eq!(
  exec_template(json!({}), "{{#if_empty \"  \"}}OK{{else}}NOK{{/if_empty}}"),
  "OK"
);
assert_eq!(
  exec_template(json!({}), "{{#if_empty not_existing}}OK{{else}}NOK{{/if_empty}}"),
  "OK"
);
assert_eq!(
  exec_template(json!({"plop": "plop"}), "{{#if_empty plop}}OK{{else}}NOK{{/if_empty}}"),
  "NOK"
);
assert_eq!(
  exec_template(json!({"plop": ""}), "{{#if_empty plop}}OK{{else}}NOK{{/if_empty}}"),
  "OK"
);
assert_eq!(
  exec_template(json!({"plop": "plop"}), "{{#if_empty not_existing}}OK{{else}}NOK{{/if_empty}}"),
  "OK"
);

Trait Implementations

impl HelperDef for IfEmptyHelper

fn call<'reg: 'rc, 'rc>( &self, h: &Helper<'reg, 'rc>, handle: &'reg Handlebars<'reg>, ctx: &'rc Context, render_ctx: &mut RenderContext<'reg, 'rc>, out: &mut dyn Output, ) -> HelperResult

A complex version of helper interface.

fn call_inner<'reg, 'rc>( &self, _: &Helper<'reg, 'rc>, _: &'reg Registry<'reg>, _: &'rc Context, _: &mut RenderContext<'reg, 'rc>, ) -> Result<ScopedJson<'reg, 'rc>, RenderError>

where 'reg: 'rc,

A simplified api to define helper