lex() function in lexer module

src/lexer/mod.rs

@@ -49,6 +49,10 @@ enum NewlineState { N, Ne, New, Newl, Newli, Newlin, Newline }
 #[derive(Clone, PartialEq, Debug)]
 enum SpaceState { S, Sp, Spa, Spac, Space }
 
+pub fn lex(input: &str) -> Lexer {
+    Lexer::new(&input)
+}
+
 pub struct Lexer {
     input: String,
     begin: usize,

src/main.rs

@@ -2,8 +2,10 @@ mod lexer;
 mod parser;
 mod types;
 
+use lexer::lex;
+
 fn main() {
-    let lexer = lexer::Lexer::new("((abc def + ghi #f))");
+    let lexer = lex("((abc def + ghi #f))");
     for t in lexer {
         println!("token = {:?}", t);
     }