Moved ParametersContext to its own file.

src/renderer/parameters_context.rs

@@ -0,0 +1,28 @@
+use crate::parser::KVPair;
+use crate::parser::RValue;
+use crate::renderer::context_element::ContextElement;
+use std::collections::HashMap;
+
+#[derive(Clone, Debug)]
+pub struct ParametersContext<'a> {
+    params: HashMap<&'a str, &'a RValue<'a>>,
+    breadcrumbs: &'a Vec<&'a dyn ContextElement>,
+}
+
+impl<'a> ParametersContext<'a> {
+    pub fn new(
+        breadcrumbs: &'a Vec<&'a dyn ContextElement>,
+        params: &'a Vec<KVPair<'a>>,
+    ) -> ParametersContext<'a> {
+        let param_map = params
+            .iter()
+            .map(|pair: &KVPair<'a>| (pair.key, &pair.value))
+            .collect();
+        ParametersContext {
+            params: param_map,
+            breadcrumbs: breadcrumbs,
+        }
+    }
+}
+
+impl<'a> ContextElement for ParametersContext<'a> {}