From 525ca2c8cb41fca31841d690a04686fc9d83e69b Mon Sep 17 00:00:00 2001
From: Scott Richmond <kredati@users.noreply.github.com>
Date: Sun, 8 Dec 2024 00:02:01 -0500
Subject: [PATCH] type alias for Context

---
 src/vm.rs | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/vm.rs b/src/vm.rs
index 207e688..fcdedc6 100644
--- a/src/vm.rs
+++ b/src/vm.rs
@@ -41,6 +41,8 @@ pub struct LudusError {
 //     }
 // }
 
+type Context<'src> = Vec<(String, Value<'src>)>;
+
 pub fn match_eq<T, U>(x: T, y: T, z: U) -> Option<U>
 where
     T: PartialEq,
@@ -55,8 +57,8 @@ where
 pub fn match_pattern<'src, 'a>(
     patt: &Pattern,
     val: &Value<'src>,
-    ctx: &'a mut Vec<(String, Value<'src>)>,
-) -> Option<&'a mut Vec<(String, Value<'src>)>> {
+    ctx: &'a mut Context<'src>,
+) -> Option<&'a mut Context<'src>> {
     match (patt, val) {
         (Pattern::Nil, Value::Nil) => Some(ctx),
         (Pattern::Placeholder, _) => Some(ctx),
@@ -197,8 +199,8 @@ pub fn match_pattern<'src, 'a>(
 
 pub fn match_clauses<'src>(
     value: &Value<'src>,
-    clauses: &'src Vec<MatchClause>,
-    ctx: &mut Vec<(String, Value<'src>)>,
+    clauses: &'src [MatchClause],
+    ctx: &mut Context<'src>,
 ) -> Result<Value<'src>, LudusError> {
     let to = ctx.len();
     for MatchClause { patt, body, guard } in clauses.iter() {
@@ -234,7 +236,7 @@ pub fn match_clauses<'src>(
 pub fn apply<'src>(
     callee: Value<'src>,
     caller: Value<'src>,
-    ctx: &mut Vec<(String, Value<'src>)>,
+    ctx: &mut Context<'src>,
 ) -> Result<Value<'src>, LudusError> {
     match (callee, caller) {
         (Value::Keyword(kw), Value::Dict(dict)) => {
@@ -304,7 +306,7 @@ pub fn apply<'src>(
 
 pub fn eval<'src, 'a>(
     ast: &'src Ast,
-    ctx: &'a mut Vec<(String, Value<'src>)>,
+    ctx: &'a mut Context<'src>,
 ) -> Result<Value<'src>, LudusError> {
     match ast {
         Ast::Nil => Ok(Value::Nil),