diff --git a/src/ast.rs b/src/ast.rs
index ab81e03..8b70dd9 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -32,7 +32,7 @@ impl std::fmt::Debug for Span {
 }
 
 #[rustfmt::skip]
-#[derive(Clone, PartialEq, Serialize, Deserialize, Debug, strum::EnumString, strum::Display)]
+#[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug, strum::EnumString, strum::Display)]
 pub enum BinOp {
     #[strum(serialize = "+") ] Plus,
     #[strum(serialize = "-") ] Minus,
@@ -49,13 +49,13 @@ pub enum BinOp {
     #[strum(serialize = "=~")] RegexMatch,
 }
 
-#[derive(Clone, PartialEq, Serialize, Deserialize, Debug, strum::EnumString, strum::Display)]
+#[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug, strum::EnumString, strum::Display)]
 pub enum UnaryOp {
     #[strum(serialize = "!")]
     Not,
 }
 
-#[derive(Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SimplExpr {
     Literal(Span, DynVal),
     VarRef(Span, String),
diff --git a/src/dynval.rs b/src/dynval.rs
index 5a38635..62b2de4 100644
--- a/src/dynval.rs
+++ b/src/dynval.rs
@@ -23,7 +23,7 @@ impl ConversionError {
     }
 }
 
-#[derive(Clone, Deserialize, Serialize, Default)]
+#[derive(Clone, Deserialize, Serialize, Default, Eq)]
 pub struct DynVal(pub String, pub Option<Span>);
 
 impl MaybeSpanned for DynVal {
diff --git a/src/lib.rs b/src/lib.rs
index 617a06b..991b775 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,6 +6,12 @@ pub mod dynval;
 pub mod error;
 pub mod eval;
 pub mod parser;
+use ast::SimplExpr;
 use lalrpop_util::lalrpop_mod;
 
 lalrpop_mod!(pub simplexpr_parser);
+
+pub fn parse_string(s: &str) -> Result<SimplExpr, error::Error> {
+    parser::parse_string(s)
+}
+pub use ast::Span;
diff --git a/src/parser/lexer.rs b/src/parser/lexer.rs
index ab73f36..7d49959 100644
--- a/src/parser/lexer.rs
+++ b/src/parser/lexer.rs
@@ -1,7 +1,7 @@
 use logos::Logos;
 
 #[rustfmt::skip]
-#[derive(Logos, Debug, PartialEq, Eq, Clone, strum::Display)]
+#[derive(Logos, Debug, PartialEq, Eq, Clone, strum::Display, strum::EnumString)]
 pub enum Token {
     #[strum(serialize = "+") ] #[token("+") ] Plus,
     #[strum(serialize = "-") ] #[token("-") ] Minus,