From bf35fd0ae474039791a621b1bfa563c350e8cffd Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Sat, 16 May 2020 22:02:58 -0400
Subject: [PATCH] equals implementation for literal.

---
 src/renderer/parameters_context.rs | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/renderer/parameters_context.rs b/src/renderer/parameters_context.rs
index 128bd21..d694651 100644
--- a/src/renderer/parameters_context.rs
+++ b/src/renderer/parameters_context.rs
@@ -179,8 +179,28 @@ impl Walkable for OwnedLiteral {
 
 impl CompareContextElement for OwnedLiteral {
     fn equals(&self, other: &dyn ContextElement) -> bool {
-        // TODO
-        false
+        // If its an OwnedLiteral then compare them directly,
+        // otherwise defer to the other type's implementation of
+        // CompareContextElement since the end user could add any
+        // type.
+        match other.to_any().downcast_ref::<Self>() {
+            None => other.equals(self),
+            Some(other_literal) => match (self, other_literal) {
+                (OwnedLiteral::LString(self_text), OwnedLiteral::LString(other_text)) => {
+                    self_text == other_text
+                }
+                (OwnedLiteral::LPositiveInteger(self_num), OwnedLiteral::LString(other_text)) => {
+                    &self_num.to_string() == other_text
+                }
+                (OwnedLiteral::LString(self_text), OwnedLiteral::LPositiveInteger(other_num)) => {
+                    self_text == &other_num.to_string()
+                }
+                (
+                    OwnedLiteral::LPositiveInteger(self_num),
+                    OwnedLiteral::LPositiveInteger(other_num),
+                ) => self_num == other_num,
+            },
+        }
     }
 
     fn partial_compare(&self, other: &dyn ContextElement) -> Option<Ordering> {