added basic datatypes

src/interpreter/value/function.rs

@@ -0,0 +1,2 @@
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Function;

src/interpreter/value/list.rs

@@ -0,0 +1,2 @@
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct List;

src/interpreter/value/mod.rs

@@ -0,0 +1,25 @@
+mod function;
+mod list;
+mod string;
+
+pub use function::Function;
+pub use list::List;
+pub use string::Str;
+
+use std::{collections::BTreeMap, rc::Rc};
+
+pub type OrderedF64 = ordered_float::OrderedFloat<f64>;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Value<'s> {
+    List(List),
+    Vector(Rc<Vec<Self>>),
+    Map(Rc<BTreeMap<Self, Self>>),
+    Symbol(Str<'s>),
+    Keyword(Str<'s>),
+    Number(OrderedF64),
+    String(Str<'s>),
+    Function(Function),
+    Macro(Function),
+}
+

src/interpreter/value/string.rs

@@ -0,0 +1,48 @@
+use std::{rc::Rc, ops::Deref, fmt::Display};
+
+#[derive(Debug, Clone)]
+pub enum Str<'a> {
+    Borrowed(&'a str),
+    Shared(Rc<str>),
+}
+
+impl<'a> From<&'a str> for Str<'a> {
+    fn from(x: &'a str) -> Self {
+        Self::Borrowed(x)
+    }
+}
+
+impl<'a> From<Rc<str>> for Str<'a> {
+    fn from(x: Rc<str>) -> Self {
+        Self::Shared(x)
+    }
+}
+
+impl<'a> Deref for Str<'a> {
+    type Target = str;
+
+    fn deref(&self) -> &Self::Target {
+        match self {
+            Self::Borrowed(b) => b,
+            Self::Shared(s) => s,
+        }
+    }
+}
+
+impl<'a> PartialEq for Str<'a> {
+    fn eq(&self, other: &Self) -> bool {
+        **self == **other
+    }
+}
+
+impl<'a> Eq for Str<'a> {}
+
+impl<'a> Display for Str<'a> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Str::Borrowed(b) => *b,
+            Str::Shared(s) => s,
+        }
+        .fmt(f)
+    }
+}