Remove RValue from ParametersContext so I can re-use it for calculated values from math.

src/renderer/parameters_context.rs

@@ -24,7 +24,7 @@ use std::collections::HashMap;
 #[derive(Debug)]
 pub struct ParametersContext<'a> {
     parent: Option<&'a ParametersContext<'a>>,
-    params: HashMap<&'a str, (&'a RValue<'a>, Option<BreadcrumbTreeElement<'a>>)>,
+    params: HashMap<&'a str, Option<BreadcrumbTreeElement<'a>>>,
 }
 
 impl<'a> ParametersContext<'a> {
@@ -42,26 +42,25 @@ impl<'a> ParametersContext<'a> {
         // then those are resolved at the time of access rather than
         // the time of assignment, so we leave them into their
         // original IntoContextElement state.
-        let rendered_params: HashMap<&'a str, (&'a RValue<'a>, Option<BreadcrumbTreeElement<'a>>)> =
-            params
-                .iter()
-                .map(|kvpair| {
-                    let k = kvpair.key;
-                    let v: Option<BreadcrumbTreeElement<'a>> = match &kvpair.value {
-                        RValue::RVLiteral(_owned_literal) => {
-                            Some(BreadcrumbTreeElement::from_borrowed(&kvpair.value))
-                        }
-                        RValue::RVPath(_path) => kvpair
-                            .value
-                            .into_context_element(renderer, breadcrumbs)
-                            .map(std::convert::From::from),
-                        RValue::RVTemplate(_template) => {
-                            Some(BreadcrumbTreeElement::from_borrowed(&kvpair.value))
-                        }
-                    };
-                    (k, (&kvpair.value, v))
-                })
-                .collect();
+        let rendered_params: HashMap<&'a str, Option<BreadcrumbTreeElement<'a>>> = params
+            .iter()
+            .map(|kvpair| {
+                let k = kvpair.key;
+                let v: Option<BreadcrumbTreeElement<'a>> = match &kvpair.value {
+                    RValue::RVLiteral(_owned_literal) => {
+                        Some(BreadcrumbTreeElement::from_borrowed(&kvpair.value))
+                    }
+                    RValue::RVPath(_path) => kvpair
+                        .value
+                        .into_context_element(renderer, breadcrumbs)
+                        .map(std::convert::From::from),
+                    RValue::RVTemplate(_template) => {
+                        Some(BreadcrumbTreeElement::from_borrowed(&kvpair.value))
+                    }
+                };
+                (k, v)
+            })
+            .collect();
 
         ParametersContext {
             parent: parent,
@@ -90,7 +89,7 @@ impl<'a> IntoContextElement for ParametersContext<'a> {
 
 impl<'a> Walkable for ParametersContext<'a> {
     fn walk(&self, segment: &str) -> Result<&dyn IntoContextElement, WalkError> {
-        match self.params.get(segment).map(|(_rvalue, bte)| bte) {
+        match self.params.get(segment) {
             Some(Some(bte)) => Ok(bte.borrow()),
             Some(None) => Err(WalkError::CantWalk),
             None => self

src/renderer/renderer.rs

@@ -668,7 +668,9 @@ impl<'a> DustRenderer<'a> {
                     Some(_) => {
                         // TODO: math with body, calculate the value and use it like a select block
                         // Calculate the value
+                        let calculated_value = self.perform_math_operation(breadcrumbs, &param_map);
                         // Generate a ParametersContext with the result of the math operation as key
+
                         // calculate are_any_checks_true
                         // Generate a SelectContext
                         // render_maybe_body