pull interpreter value out into its own file

rust/rox/src/interpreter.rs

@@ -3,6 +3,7 @@ use thiserror::Error;
 use crate::{
     expression::Expression,
     token::{Literal, Token, TokenType},
+    value::Value,
 };
 
 #[derive(Error, Debug)]
@@ -15,35 +16,6 @@ pub enum InterpreterError {
     BinaryOperatorUnknown(usize, String),
 }
 
-#[derive(Clone, Debug, PartialEq)]
-pub enum Value {
-    String(String),
-    Number(f64),
-    Boolean(bool),
-    Nil,
-}
-
-impl Value {
-    fn is_truthy(&self) -> bool {
-        match self {
-            Value::Nil => false,
-            Value::Boolean(b) => *b,
-            _ => true,
-        }
-    }
-}
-
-impl From<Literal> for Value {
-    fn from(value: Literal) -> Self {
-        match value {
-            Literal::String(x) => Value::String(x),
-            Literal::Number(x) => Value::Number(x),
-            Literal::Boolean(x) => Value::Boolean(x),
-            Literal::Nil => Value::Nil,
-        }
-    }
-}
-
 /// Try to evaluate an expression and return its result.
 pub fn evaluate(expression: Expression) -> Result<Value, InterpreterError> {
     match expression {