no need to use Rc in lexer

Author: tiye

Cargo.toml

@@ -46,5 +46,5 @@ bench = true
 debug = true
 
 [[bench]]
-name = "formatting"
+name = "parsing"
 harness = false

benches/parsing.rs

@@ -4,12 +4,12 @@ use std::fs;
 use cirru_parser::parse;
 
 fn criterion_benchmark(c: &mut Criterion) {
-  let large_demo = "/Users/chenyong/repo/calcit-lang/editor/compact.cirru";
+  let large_demo = "/Users/chenyong/repo/calcit-lang/editor/calcit.cirru";
   let content = fs::read_to_string(large_demo).unwrap();
 
   c.bench_function("parse", |b| {
     b.iter(|| {
-      let _ = parse(&content);
+      let _ = parse(&content).expect("parsed");
     })
   });
 }

src/parser.rs

@@ -149,28 +149,28 @@ pub fn lex(initial_code: &str) -> Result<CirruLexItemList, String> {
       },
       CirruLexState::Token => match c {
         ' ' => {
-          acc.push(CirruLexItem::Str(buffer.into()));
+          acc.push(CirruLexItem::Str(buffer));
           state = CirruLexState::Space;
           buffer = String::from("");
         }
         '"' => {
-          acc.push(CirruLexItem::Str(buffer.into()));
+          acc.push(CirruLexItem::Str(buffer));
           state = CirruLexState::Str;
           buffer = String::from("");
         }
         '\n' => {
-          acc.push(CirruLexItem::Str(buffer.into()));
+          acc.push(CirruLexItem::Str(buffer));
           state = CirruLexState::Indent;
           buffer = String::from("");
         }
         '(' => {
-          acc.push(CirruLexItem::Str(buffer.into()));
+          acc.push(CirruLexItem::Str(buffer));
           acc.push(CirruLexItem::Open);
           state = CirruLexState::Space;
           buffer = String::from("")
         }
         ')' => {
-          acc.push(CirruLexItem::Str(buffer.into()));
+          acc.push(CirruLexItem::Str(buffer));
           acc.push(CirruLexItem::Close);
           state = CirruLexState::Space;
           buffer = String::from("")
@@ -182,7 +182,7 @@ pub fn lex(initial_code: &str) -> Result<CirruLexItemList, String> {
       },
       CirruLexState::Str => match c {
         '"' => {
-          acc.push(CirruLexItem::Str(buffer.into()));
+          acc.push(CirruLexItem::Str(buffer));
           state = CirruLexState::Space;
           buffer = String::from("");
         }
@@ -268,7 +268,7 @@ pub fn lex(initial_code: &str) -> Result<CirruLexItemList, String> {
   match state {
     CirruLexState::Space => Ok(acc),
     CirruLexState::Token => {
-      acc.push(CirruLexItem::Str(buffer.into()));
+      acc.push(CirruLexItem::Str(buffer));
       Ok(acc)
     }
     CirruLexState::Escape => Err(String::from("unknown escape")),

src/primes.rs

@@ -1,9 +1,9 @@
 use bincode::{Decode, Encode};
+use std::clone::Clone;
 use std::fmt;
 use std::hash::Hash;
 use std::str;
 use std::sync::Arc;
-use std::{clone::Clone, rc::Rc};
 
 #[cfg(feature = "use-serde")]
 use serde::{
@@ -174,7 +174,7 @@ pub enum CirruLexItem {
   Close,
   // supposed to be enough with indentation of 255
   Indent(u8),
-  Str(Rc<str>),
+  Str(String),
 }
 
 impl From<&str> for CirruLexItem {