codegenr_lib/helpers/
empty.rs

1use super::handlebars_ext::HandlebarsExt;
2use super::string_ext::StringExt;
3use handlebars::{HelperDef, Renderable};
4use serde_json::Value;
5
6pub const IF_NOT_EMPTY_HELPER: &str = "if_not_empty";
7pub const IF_EMPTY_HELPER: &str = "if_empty";
8
9/// Call the template if a non empty or whitespaces string is passed as parameter, or any other non null value
10/// ```
11/// # use codegenr_lib::helpers::*;
12/// # use serde_json::json;
13/// assert_eq!(
14///   exec_template(json!({}), "{{#if_not_empty 42}}OK{{else}}NOK{{/if_not_empty}}"),
15///   "OK"
16/// );
17/// assert_eq!(
18///   exec_template(json!({}), "{{#if_not_empty \"42\"}}OK{{else}}NOK{{/if_not_empty}}"),
19///   "OK"
20/// );
21/// assert_eq!(
22///   exec_template(json!({}), "{{#if_not_empty \"  \"}}OK{{else}}NOK{{/if_not_empty}}"),
23///   "NOK"
24/// );
25/// assert_eq!(
26///   exec_template(json!({}), "{{#if_not_empty not_existing}}OK{{else}}NOK{{/if_not_empty}}"),
27///   "NOK"
28/// );
29/// assert_eq!(
30///   exec_template(json!({"plop": "plop"}), "{{#if_not_empty plop}}OK{{else}}NOK{{/if_not_empty}}"),
31///   "OK"
32/// );
33/// assert_eq!(
34///   exec_template(json!({"plop": ""}), "{{#if_not_empty plop}}OK{{else}}NOK{{/if_not_empty}}"),
35///   "NOK"
36/// );
37/// assert_eq!(
38///   exec_template(json!({"plop": "plop"}), "{{#if_not_empty not_existing}}OK{{else}}NOK{{/if_not_empty}}"),
39///   "NOK"
40/// );
41/// ```
42pub struct IfNotEmptyHelper;
43
44impl HelperDef for IfNotEmptyHelper {
45  fn call<'reg: 'rc, 'rc>(
46    &self,
47    h: &handlebars::Helper<'reg, 'rc>,
48    handle: &'reg handlebars::Handlebars<'reg>,
49    ctx: &'rc handlebars::Context,
50    render_ctx: &mut handlebars::RenderContext<'reg, 'rc>,
51    out: &mut dyn handlebars::Output,
52  ) -> handlebars::HelperResult {
53    let param0 = h.get_param_as_json_or_fail(0, IF_NOT_EMPTY_HELPER)?;
54    let is_empty = is_json_empty(param0);
55    let temp = if !is_empty { h.template() } else { h.inverse() };
56    match temp {
57      Some(t) => t.render(handle, ctx, render_ctx, out),
58      None => Ok(()),
59    }
60  }
61}
62
63/// Call the template if an empty or whitespaces string is passed as parameter
64/// ```
65/// # use codegenr_lib::helpers::*;
66/// # use serde_json::json;
67/// assert_eq!(
68///   exec_template(json!({"a": 42}), "{{#if_empty a}}OK{{else}}NOK{{/if_empty}}"),
69///   "NOK"
70/// );
71/// assert_eq!(
72///   exec_template(json!({}), "{{#if_empty \"42\"}}OK{{else}}NOK{{/if_empty}}"),
73///   "NOK"
74/// );
75/// assert_eq!(
76///   exec_template(json!({}), "{{#if_empty \"  \"}}OK{{else}}NOK{{/if_empty}}"),
77///   "OK"
78/// );
79/// assert_eq!(
80///   exec_template(json!({}), "{{#if_empty not_existing}}OK{{else}}NOK{{/if_empty}}"),
81///   "OK"
82/// );
83/// assert_eq!(
84///   exec_template(json!({"plop": "plop"}), "{{#if_empty plop}}OK{{else}}NOK{{/if_empty}}"),
85///   "NOK"
86/// );
87/// assert_eq!(
88///   exec_template(json!({"plop": ""}), "{{#if_empty plop}}OK{{else}}NOK{{/if_empty}}"),
89///   "OK"
90/// );
91/// assert_eq!(
92///   exec_template(json!({"plop": "plop"}), "{{#if_empty not_existing}}OK{{else}}NOK{{/if_empty}}"),
93///   "OK"
94/// );
95/// ```
96pub struct IfEmptyHelper;
97
98impl HelperDef for IfEmptyHelper {
99  fn call<'reg: 'rc, 'rc>(
100    &self,
101    h: &handlebars::Helper<'reg, 'rc>,
102    handle: &'reg handlebars::Handlebars<'reg>,
103    ctx: &'rc handlebars::Context,
104    render_ctx: &mut handlebars::RenderContext<'reg, 'rc>,
105    out: &mut dyn handlebars::Output,
106  ) -> handlebars::HelperResult {
107    let param0 = h.get_param_as_json_or_fail(0, IF_EMPTY_HELPER)?;
108    let is_empty = is_json_empty(param0);
109    let temp = if is_empty { h.template() } else { h.inverse() };
110    match temp {
111      Some(t) => t.render(handle, ctx, render_ctx, out),
112      None => Ok(()),
113    }
114  }
115}
116
117fn is_json_empty(param0: &Value) -> bool {
118  match param0 {
119    Value::Null => true,
120    Value::String(s) => s.is_empty_or_whitespaces(),
121    _ => false,
122  }
123}
codegenr_lib/helpers/empty.rs

codegenr_lib/helpers/
empty.rs
