moved AST into seperate file

src/ast.rs

@@ -0,0 +1,50 @@
+use std::ops::Range;
+
+use crate::lexer::Spanned;
+
+#[derive(Clone, Debug)]
+pub struct Tuple<'a>(pub Vec<Spanned<Symbol<'a>>>);
+
+#[derive(Clone, Debug)]
+pub enum Symbol<'a> {
+    Epsilon,
+    Ident(&'a str),
+}
+
+#[derive(Clone, Debug)]
+pub enum Dest<'a> {
+    Ident(&'a str),
+    Function(Spanned<&'a str>, Spanned<Tuple<'a>>),
+}
+
+#[derive(Clone, Debug)]
+pub enum Item<'a> {
+    Symbol(Symbol<'a>),
+    Tuple(Tuple<'a>),
+    List(List<'a>),
+}
+
+#[derive(Clone, Debug)]
+pub enum Regex<'a>{
+    Terminal(&'a str),
+    Match{
+        complement: bool,
+        patterns: Vec<Range<char>>
+    },
+    Concat(Vec<Regex<'a>>),
+    Star(Box<Regex<'a>>),
+    Plus(Box<Regex<'a>>),
+    Union(Vec<Regex<'a>>),
+    Intersection(Vec<Regex<'a>>),
+    Complement(Box<Regex<'a>>),
+}
+
+#[derive(Clone, Debug)]
+pub struct List<'a>(pub Vec<Spanned<Item<'a>>>);
+
+#[derive(Clone, Debug)]
+pub enum TopLevel<'a> {
+    Assignment(Spanned<Dest<'a>>, Spanned<Item<'a>>),
+    ProductionRule(Spanned<Symbol<'a>>, Spanned<Symbol<'a>>),
+    Table(),
+}