codegenr 0.0.2

Fast json/yaml/openapi code generator based on handlebars templating.
Documentation 
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use super::handlebars_ext::HandlebarsExt;
use handlebars::{HelperDef, Renderable};

pub const IF_EQUALS_HELPER: &str = "if_equals";
pub const IF_NOT_EQUALS_HELPER: &str = "if_not_equals";

/// Execute template if the first argument is equal to any other argument, otherwise execute the inverse
/// (all arguments are converted to string and case insensitive compared)
/// ```
/// # use codegenr_lib::helpers::*;
/// # use serde_json::json;
/// //assert_eq!(
///   //exec_template(json!({}), r#"{{#if_equals "test" "teSt"}}OK{{else}}{{/if_equals}}"#),
///   //"OK"
/// //);
/// assert_eq!(
///   exec_template(json!({ "a": "42", "b": "42" }), r#"{{#if_equals a ./b }}OK{{else}}{{/if_equals}}"#),
///   "OK"
/// );
/// assert_eq!(
///   exec_template(json!({}), r#"{{#if_equals "test" "NO"}}OK{{else}}NOK{{/if_equals}}"#),
///   "NOK"
/// );
/// assert_eq!(
///   exec_template(json!({}), r#"{{#if_equals "test" "NO" "NO" "test"}}OK{{else}}NOK{{/if_equals}}"#),
///   "OK"
/// );
/// assert_eq!(
///   exec_template(json!({}), r#"{{#if_equals "test" "NO" "NOPE"}}OK{{else}}NOK{{/if_equals}}"#),
///   "NOK"
/// );
/// ```
pub struct IfEqualsHelper;

impl HelperDef for IfEqualsHelper {
  fn call<'reg: 'rc, 'rc>(
    &self,
    h: &handlebars::Helper<'reg, 'rc>,
    handle: &'reg handlebars::Handlebars<'reg>,
    ctx: &'rc handlebars::Context,
    render_ctx: &mut handlebars::RenderContext<'reg, 'rc>,
    out: &mut dyn handlebars::Output,
  ) -> handlebars::HelperResult {
    h.ensure_arguments_count_min(2, IF_EQUALS_HELPER)?;
    let value = h.get_param_as_json_or_fail(0, IF_EQUALS_HELPER)?;

    // todo: insensitive strings compare (when both strings)
    let is_value_found = h.params().iter().skip(1).any(|p| p.value() == value);
    let temp = if is_value_found { h.template() } else { h.inverse() };

    match temp {
      Some(t) => t.render(handle, ctx, render_ctx, out),
      None => Ok(()),
    }
  }
}

/// Execute template if the first argument is not equal to all other arguments, otherwise execute the inverse
/// (all arguments are converted to string and case insensitive compared)
/// ```
/// # use codegenr_lib::helpers::*;
/// # use serde_json::json;
/// //assert_eq!(
///   //exec_template(json!({}), r#"{{#if_not_equals "test" "teSt"}}{{else}}NOK{{/if_not_equals}}"#),
///   //"NOK"
/// //);
/// assert_eq!(
///   exec_template(json!({ "a": "42", "b": "42" }), r#"{{#if_not_equals a ./b }}{{else}}NOK{{/if_not_equals}}"#),
///   "NOK"
/// );
/// assert_eq!(
///   exec_template(json!({}), r#"{{#if_not_equals "test" "NO"}}OK{{else}}NOK{{/if_not_equals}}"#),
///   "OK"
/// );
/// assert_eq!(
///   exec_template(json!({}), r#"{{#if_not_equals "test" "NO" "NO" "test"}}OK{{else}}NOK{{/if_not_equals}}"#),
///   "NOK"
/// );
/// assert_eq!(
///   exec_template(json!({}), r#"{{#if_not_equals "test" "NO" "NOPE"}}OK{{else}}NOK{{/if_not_equals}}"#),
///   "OK"
/// );
/// ```
pub struct IfNotEqualsHelper;

impl HelperDef for IfNotEqualsHelper {
  fn call<'reg: 'rc, 'rc>(
    &self,
    h: &handlebars::Helper<'reg, 'rc>,
    handle: &'reg handlebars::Handlebars<'reg>,
    ctx: &'rc handlebars::Context,
    render_ctx: &mut handlebars::RenderContext<'reg, 'rc>,
    out: &mut dyn handlebars::Output,
  ) -> handlebars::HelperResult {
    h.ensure_arguments_count_min(2, IF_NOT_EQUALS_HELPER)?;
    let value = h.get_param_as_json_or_fail(0, IF_NOT_EQUALS_HELPER)?;

    // todo: insensitive strings compare (when both strings)
    let is_value_found = h.params().iter().skip(1).any(|p| p.value() == value);
    let temp = if !is_value_found { h.template() } else { h.inverse() };

    match temp {
      Some(t) => t.render(handle, ctx, render_ctx, out),
      None => Ok(()),
    }
  }
}