refactor: move lexer to parser module

src/evaluator/mod.rs

@@ -176,7 +176,6 @@ fn eval_ast_node(env: Rc<Environment>, ast_node: Node) -> Result<Rc<Expression>>
 
 #[cfg(test)]
 mod test {
-    use crate::lexer;
     use crate::parser;
 
     use super::*;
@@ -242,8 +241,7 @@ mod test {
     #[case("(>= 1 2)", "false")]
     fn test_evaluator(#[case] input: &str, #[case] expected: &str) {
         let env = core_environment();
-        let tokens = lexer::read(input).unwrap();
-        let ast = parser::parse(tokens).unwrap();
+        let ast = parser::parse_str(input).unwrap();
         let res = eval(env, ast)
             .unwrap()
             .into_iter()
@@ -260,8 +258,7 @@ mod test {
     #[case("{:a}")]
     fn test_evaluator_fail(#[case] input: &str) {
         let env = core_environment();
-        let tokens = lexer::read(input).unwrap();
-        let ast = parser::parse(tokens).unwrap();
+        let ast = parser::parse_str(input).unwrap();
         let res = eval(env, ast);
 
         assert!(res.is_err())

src/main.rs

@@ -1,7 +1,6 @@
 use std::io::{self, Write};
 
 mod evaluator;
-mod lexer;
 mod parser;
 
 fn main() {
@@ -22,8 +21,7 @@ fn main() {
             break;
         }
 
-        let tokens = lexer::read(&input).unwrap();
-        let ast = parser::parse(tokens).unwrap();
+        let ast = parser::parse_str(&input).unwrap();
         let res = evaluator::eval(env.clone(), ast);
 
         match res {

src/parser/mod.rs

@@ -2,7 +2,8 @@ use std::{collections::HashMap, iter::Peekable, vec::IntoIter};
 
 use anyhow::{bail, Result};
 
-use crate::lexer::Token;
+mod lexer;
+use lexer::Token;
 
 #[derive(Debug, Clone)]
 pub enum Node {
@@ -19,8 +20,8 @@ pub enum Node {
     Map(HashMap<String, Node>),
 }
 
-pub fn parse(tokens: Vec<Token>) -> Result<Vec<Node>> {
-    let mut tokens = tokens.into_iter().peekable();
+pub fn parse_str(input: &str) -> Result<Vec<Node>> {
+    let mut tokens = lexer::read(input)?.into_iter().peekable();
     let mut ast = Vec::new();
 
     while let Some(node) = next_statement(&mut tokens)? {