🙃

backend/Cargo.lock

@@ -331,6 +331,8 @@ dependencies = [
  "env_logger",
  "futures-util",
  "log",
+ "serde",
+ "serde_json",
  "tokio",
  "tokio-tungstenite",
 ]
@@ -512,6 +514,12 @@ version = "0.1.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56f7d92ca342cea22a06f2121d944b4fd82af56988c270852495420f961d4ace"
 
+[[package]]
+name = "ryu"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
+
 [[package]]
 name = "serde"
 version = "1.0.219"
@@ -532,6 +540,18 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.143"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d401abef1d108fbd9cbaebc3e46611f4b1021f714a0597a71f41ee463f5f4a5a"
+dependencies = [
+ "itoa",
+ "memchr",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.6"

backend/Cargo.toml

@@ -7,5 +7,7 @@ edition = "2024"
 env_logger = "0.11.8"
 futures-util = "0.3.31"
 log = "0.4.27"
+serde = { version = "1.0.219", features = ["derive"] }
+serde_json = "1.0.143"
 tokio = { version = "1.47.1", features = ["rt-multi-thread", "macros", "net", "time"] }
 tokio-tungstenite = "0.27.0"

backend/src/cell.rs

@@ -1,5 +1,7 @@
 use std::collections::HashSet;
 
+use serde::{Deserialize, Serialize};
+
 use crate::evaluator::*;
 
 #[derive(Clone)]
@@ -49,23 +51,24 @@ impl Cell {
     }
 }
 
-#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, Hash, PartialEq, Eq)]
 pub struct CellRef {
-    pub row: i64,
-    pub col: i64,
+    pub row: usize,
+    pub col: usize,
 }
 
 impl CellRef {
+    // Zero indexed
     pub fn new(s: String) -> Result<CellRef, String> {
         let s = s.trim();
-        let mut col: i64 = 0;
+        let mut col: usize = 0;
         let mut i = 0;
 
         // consume leading letters for the column
         for (idx, ch) in s.char_indices() {
             if ch.is_ascii_alphabetic() {
                 let u = ch.to_ascii_uppercase() as u8;
-                let val = (u - b'A' + 1) as i64; // A->1 ... Z->26
+                let val = (u - b'A' + 1) as usize; // A->1 ... Z->26
                 col = col * 26 + val;
                 i = idx + ch.len_utf8();
             } else {
@@ -90,8 +93,11 @@ impl CellRef {
             ));
         }
 
-        if let Ok(row) = row_part.parse::<i64>() {
-            Ok(CellRef { row, col })
+        if let Ok(row) = row_part.parse::<usize>() {
+            Ok(CellRef {
+                row: row - 1,
+                col: col - 1,
+            })
         } else {
             Err(format!("Parse error: invalid row number."))
         }

backend/src/evaluator.rs

@@ -1,7 +1,8 @@
-use crate::cell::{Cell, CellRef};
+use crate::cell::CellRef;
+use crate::grid::Grid;
 use crate::parser::*;
 use crate::tokenizer::Literal;
-use std::collections::{HashMap, HashSet};
+use std::collections::HashSet;
 use std::fmt;
 
 #[derive(Debug, PartialEq, Clone)]
@@ -17,115 +18,58 @@ impl fmt::Display for Eval {
     }
 }
 
-pub struct Evaluator {
-    cells: HashMap<CellRef, Cell>,
+pub fn evaluate(str: String, grid: Option<&Grid>) -> Result<(Eval, HashSet<CellRef>), String> {
+    let (expr, deps) = parse(&str)?;
+
+    match evaluate_expr(&expr, grid) {
+        Ok(it) => Ok((it, deps)),
+        Err(it) => Err(it),
+    }
 }
 
-impl Evaluator {
-    pub fn new() -> Evaluator {
-        return Evaluator {
-            cells: HashMap::new(),
-        };
-    }
-
-    pub fn set_cell(&mut self, cell_ref: CellRef, raw_val: String) -> Result<Eval, String> {
-        if self.cells.contains_key(&cell_ref) && self.cells[&cell_ref].raw() == raw_val {
-            return self.get_cell(cell_ref);
-        }
-
-        let eval: Eval;
-        let deps: HashSet<CellRef>;
-
-        if let Some(c) = raw_val.chars().nth(0)
-            && c == '='
-        {
-            (eval, deps) = self.evaluate(raw_val[1..].to_owned())?;
-            // for dep in deps {}
-        } else {
-            match self.evaluate(raw_val.to_owned()) {
-                Ok(e) => {
-                    (eval, deps) = e;
-                }
-                Err(_) => eval = Eval::Literal(Literal::String(raw_val.to_owned())),
+fn evaluate_expr(expr: &Expr, grid: Option<&Grid>) -> Result<Eval, String> {
+    let res = match expr {
+        Expr::Literal(lit) => Eval::Literal(lit.clone()),
+        Expr::CellRef(re) => {
+            if let Some(g) = grid {
+                g.get_cell(re.to_owned())?
+            } else {
+                return Err("Evaluation error: Found cell reference but no grid.".into());
             }
         }
+        Expr::Infix { op, lhs, rhs } => {
+            let lval = evaluate_expr(lhs, grid)?;
+            let rval = evaluate_expr(rhs, grid)?;
 
-        self.cells
-            .insert(cell_ref, Cell::new(eval.clone(), raw_val));
-        Ok(eval)
-    }
-
-    // pub fn get_cell(&mut self, cell_ref: CellRef) -> Result<(String, Eval), String> {
-    pub fn get_cell(&mut self, cell_ref: CellRef) -> Result<Eval, String> {
-        if !self.cells.contains_key(&cell_ref) {
-            return Err(format!("Cell at {:?} not found.", cell_ref));
-        }
-
-        let cell = &self.cells[&cell_ref];
-
-        // Ok((cell.raw(), cell.eval()))
-        Ok(cell.eval())
-    }
-
-    pub fn add_cell_dep(&mut self, cell_ref: CellRef, dep_ref: CellRef) -> Result<(), String> {
-        if !self.cells.contains_key(&cell_ref) {
-            return Err(format!("Cell at {:?} not found.", cell_ref));
-        }
-
-        if let Some(cell) = self.cells.get_mut(&cell_ref) {
-            cell.add_i_dep(dep_ref);
-        }
-
-        Ok(())
-    }
-
-    pub fn evaluate(&mut self, str: String) -> Result<(Eval, HashSet<CellRef>), String> {
-        let (expr, deps) = parse(&str)?;
-
-        match self.evaluate_expr(&expr) {
-            Ok(it) => Ok((it, deps)),
-            Err(it) => Err(it),
-        }
-    }
-
-    fn evaluate_expr(&mut self, expr: &Expr) -> Result<Eval, String> {
-        let res = match expr {
-            Expr::Literal(lit) => Eval::Literal(lit.clone()),
-            Expr::CellRef(re) => self.get_cell(re.to_owned())?,
-            Expr::Infix { op, lhs, rhs } => {
-                let lval = self.evaluate_expr(lhs)?;
-                let rval = self.evaluate_expr(rhs)?;
-
-                match op {
-                    InfixOp::ADD => eval_add(&lval, &rval)?,
-                    InfixOp::SUB => eval_sub(&lval, &rval)?,
-                    InfixOp::MUL => eval_mul(&lval, &rval)?,
-                    InfixOp::DIV => eval_div(&lval, &rval)?,
-                    _ => return Err(format!("Evaluation error: Unsupported operator {:?}", op)),
-                }
+            match op {
+                InfixOp::ADD => eval_add(&lval, &rval)?,
+                InfixOp::SUB => eval_sub(&lval, &rval)?,
+                InfixOp::MUL => eval_mul(&lval, &rval)?,
+                InfixOp::DIV => eval_div(&lval, &rval)?,
+                _ => return Err(format!("Evaluation error: Unsupported operator {:?}", op)),
             }
-            Expr::Prefix { op, expr } => {
-                let val = self.evaluate_expr(expr)?;
+        }
+        Expr::Prefix { op, expr } => {
+            let val = evaluate_expr(expr, grid)?;
 
-                match op {
-                    PrefixOp::POS => eval_pos(&val)?,
-                    PrefixOp::NEG => eval_neg(&val)?,
-                    PrefixOp::NOT => eval_not(&val)?,
-                    _ => return Err(format!("Evaluation error: Unsupported operator {:?}", op)),
-                }
+            match op {
+                PrefixOp::POS => eval_pos(&val)?,
+                PrefixOp::NEG => eval_neg(&val)?,
+                PrefixOp::NOT => eval_not(&val)?,
+                // _ => return Err(format!("Evaluation error: Unsupported operator {:?}", op)),
             }
-            Expr::Group(g) => self.evaluate_expr(g)?,
-            it => return Err(format!("Evaluation error: Unsupported expression {:?}", it)),
-        };
+        }
+        Expr::Group(g) => evaluate_expr(g, grid)?,
+        it => return Err(format!("Evaluation error: Unsupported expression {:?}", it)),
+    };
 
-        Ok(res)
-    }
+    Ok(res)
 }
 
 fn eval_add(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
     match (lval, rval) {
         (Eval::Literal(a), Eval::Literal(b)) => {
-            if let Some(res) = eval_numeric_infix(a, b, |x, y| x + y, |x, y| x + y) {
+            if let Some(res) = eval_numeric_infix(a, b, |x, y| x + y) {
                 return Ok(Eval::Literal(res));
             }
 
@@ -144,7 +88,7 @@ fn eval_add(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
 fn eval_sub(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
     match (lval, rval) {
         (Eval::Literal(a), Eval::Literal(b)) => {
-            if let Some(res) = eval_numeric_infix(a, b, |x, y| x - y, |x, y| x - y) {
+            if let Some(res) = eval_numeric_infix(a, b, |x, y| x - y) {
                 return Ok(Eval::Literal(res));
             }
 
@@ -155,7 +99,7 @@ fn eval_sub(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
 fn eval_mul(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
     match (lval, rval) {
         (Eval::Literal(a), Eval::Literal(b)) => {
-            if let Some(res) = eval_numeric_infix(a, b, |x, y| x * y, |x, y| x * y) {
+            if let Some(res) = eval_numeric_infix(a, b, |x, y| x * y) {
                 return Ok(Eval::Literal(res));
             }
 
@@ -166,15 +110,15 @@ fn eval_mul(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
 fn eval_div(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
     match (lval, rval) {
         (Eval::Literal(a), Eval::Literal(b)) => {
-            if let (Literal::Integer(_), Literal::Integer(y)) = (a, b) {
-                if *y == 0 {
+            if let (Literal::Number(_), Literal::Number(y)) = (a, b) {
+                if *y == 0f64 {
                     return Err(
                         "Evaluation error: integers attempted to divide by zero.".to_string()
                     );
                 }
             }
 
-            if let Some(res) = eval_numeric_infix(a, b, |x, y| x / y, |x, y| x / y) {
+            if let Some(res) = eval_numeric_infix(a, b, |x, y| x / y) {
                 return Ok(Eval::Literal(res));
             }
 
@@ -183,41 +127,23 @@ fn eval_div(lval: &Eval, rval: &Eval) -> Result<Eval, String> {
     }
 }
 
-fn eval_numeric_infix<FInt, FDouble>(
-    lhs: &Literal,
-    rhs: &Literal,
-    int_op: FInt,
-    double_op: FDouble,
-) -> Option<Literal>
-where
-    FInt: Fn(i64, i64) -> i64,
-    FDouble: Fn(f64, f64) -> f64,
-{
+fn eval_numeric_infix(lhs: &Literal, rhs: &Literal, op: fn(f64, f64) -> f64) -> Option<Literal> {
     match (lhs, rhs) {
-        (Literal::Integer(a), Literal::Integer(b)) => Some(Literal::Integer(int_op(*a, *b))),
-        (Literal::Double(a), Literal::Double(b)) => Some(Literal::Double(double_op(*a, *b))),
-        (Literal::Integer(a), Literal::Double(b)) => {
-            Some(Literal::Double(double_op(*a as f64, *b)))
-        }
-        (Literal::Double(a), Literal::Integer(b)) => {
-            Some(Literal::Double(double_op(*a, *b as f64)))
-        }
+        (Literal::Number(a), Literal::Number(b)) => Some(Literal::Number(op(*a, *b))),
         _ => None,
     }
 }
 
 fn eval_pos(val: &Eval) -> Result<Eval, String> {
     match val {
-        Eval::Literal(Literal::Integer(it)) => Ok(Eval::Literal(Literal::Integer(*it))),
-        Eval::Literal(Literal::Double(it)) => Ok(Eval::Literal(Literal::Double(*it))),
+        Eval::Literal(Literal::Number(it)) => Ok(Eval::Literal(Literal::Number(*it))),
         _ => Err("Evaluation error: expected numeric type for POS function.".to_string()),
     }
 }
 
 fn eval_neg(val: &Eval) -> Result<Eval, String> {
     match val {
-        Eval::Literal(Literal::Integer(it)) => Ok(Eval::Literal(Literal::Integer(-it))),
-        Eval::Literal(Literal::Double(it)) => Ok(Eval::Literal(Literal::Double(-it))),
+        Eval::Literal(Literal::Number(it)) => Ok(Eval::Literal(Literal::Number(-it))),
         _ => Err("Evaluation error: expected numeric type for NEG function.".to_string()),
     }
 }

backend/src/grid.rs

@@ -0,0 +1,72 @@
+use std::collections::{HashMap, HashSet};
+
+use crate::{
+    cell::{Cell, CellRef},
+    evaluator::{Eval, evaluate},
+    tokenizer::Literal,
+};
+
+pub struct Grid {
+    cells: HashMap<CellRef, Cell>,
+}
+
+impl Grid {
+    pub fn new() -> Grid {
+        return Grid {
+            cells: HashMap::new(),
+        };
+    }
+}
+
+impl Grid {
+    pub fn set_cell(&mut self, cell_ref: CellRef, raw_val: String) -> Result<Eval, String> {
+        if self.cells.contains_key(&cell_ref) && self.cells[&cell_ref].raw() == raw_val {
+            return self.get_cell(cell_ref);
+        }
+
+        let eval: Eval;
+        let deps: HashSet<CellRef>;
+
+        if let Some(c) = raw_val.chars().nth(0)
+            && c == '='
+        {
+            (eval, deps) = evaluate(raw_val[1..].to_owned(), Some(&self))?;
+            // for dep in deps {}
+        } else {
+            match evaluate(raw_val.to_owned(), Some(&self)) {
+                Ok(e) => {
+                    (eval, deps) = e;
+                }
+                Err(_) => eval = Eval::Literal(Literal::String(raw_val.to_owned())),
+            }
+        }
+
+        self.cells
+            .insert(cell_ref, Cell::new(eval.clone(), raw_val));
+        Ok(eval)
+    }
+
+    // pub fn get_cell(&mut self, cell_ref: CellRef) -> Result<(String, Eval), String> {
+    pub fn get_cell(&self, cell_ref: CellRef) -> Result<Eval, String> {
+        if !self.cells.contains_key(&cell_ref) {
+            return Err(format!("Cell at {:?} not found.", cell_ref));
+        }
+
+        let cell = &self.cells[&cell_ref];
+
+        // Ok((cell.raw(), cell.eval()))
+        Ok(cell.eval())
+    }
+
+    pub fn add_cell_dep(&mut self, cell_ref: CellRef, dep_ref: CellRef) -> Result<(), String> {
+        if !self.cells.contains_key(&cell_ref) {
+            return Err(format!("Cell at {:?} not found.", cell_ref));
+        }
+
+        if let Some(cell) = self.cells.get_mut(&cell_ref) {
+            cell.add_i_dep(dep_ref);
+        }
+
+        Ok(())
+    }
+}

backend/src/main.rs

@@ -1,28 +1,24 @@
 mod cell;
 mod evaluator;
+mod grid;
+mod messages;
 mod parser;
 mod tokenizer;
 
-use futures_util::{SinkExt, StreamExt, TryStreamExt, future};
+use futures_util::{SinkExt, StreamExt, TryStreamExt};
 use log::info;
 use std::{env, io::Error};
 use tokio::net::{TcpListener, TcpStream};
 
-use crate::{cell::CellRef, evaluator::Evaluator};
+use crate::{
+    evaluator::Eval,
+    grid::Grid,
+    messages::{LeadMsg, MsgType},
+};
 
 #[tokio::main]
 async fn main() -> Result<(), Error> {
     env_logger::init();
-    // let mut input = String::new();
-    // io::stdin().read_line(&mut input).expect("Expected input.");
-
-    // let mut ast = parser::parse(&input).unwrap();
-    // println!("{}", ast.pretty());
-    let mut evaluator = Evaluator::new();
-    // // println!("{}", evaluator.evaluate(input).unwrap());
-    // let a1 = CellRef { row: 1, col: 2 };
-    // evaluator.set_cell(a1, input).unwrap();
-    // println!("{:?}", evaluator.get_cell(a1).unwrap());
 
     let addr = env::args()
         .nth(1)
@@ -38,78 +34,8 @@ async fn main() -> Result<(), Error> {
     }
 
     Ok(())
-
-    // println!("CMDS : set <cell_ref>, get <cell_ref>");
-    // loop {
-    //     let mut input = String::new();
-    //     io::stdin().read_line(&mut input).expect("Expected input.");
-    //
-    //     let cmds = ["set", "get"];
-    //     let cmd = &input[0..3];
-    //     if !cmds.iter().any(|c| c == &cmd) {
-    //         println!("{} is an invalid command!", cmd);
-    //         println!("CMDS : set <cell_ref>, get <cell_ref>");
-    //         continue;
-    //     }
-    //
-    //     let rest = &input[4..];
-    //     let mut parts = rest.splitn(2, char::is_whitespace);
-    //
-    //     let raw_ref = parts.next().unwrap_or("").trim(); // cell reference
-    //     let raw_str = parts.next().unwrap_or("").trim(); // rest of the string (value)
-    //     // println!("{} {}", raw_ref, raw_str);
-    //
-    //     if let Ok(cell_ref) = CellRef::new(raw_ref.to_owned()) {
-    //         match cmd {
-    //             "set" => match evaluator.set_cell(cell_ref, raw_str.to_owned()) {
-    //                 Ok(_) => println!("Successfully set cell {} to {}.", raw_ref, raw_str),
-    //                 Err(e) => println!("{}", e),
-    //             },
-    //             "get" => match evaluator.get_cell(cell_ref) {
-    //                 Ok(res) => println!("{:?}", res),
-    //                 Err(e) => println!("{}", e),
-    //             },
-    //             _ => {
-    //                 panic!("Impossible.");
-    //             }
-    //         }
-    //     } else {
-    //         println!("{} is an invalid cell reference!", raw_ref);
-    //         continue;
-    //     }
-    // }
 }
 
-// async fn accept_connection(stream: TcpStream) {
-//     let addr = stream
-//         .peer_addr()
-//         .expect("connected streams should have a peer address");
-//     info!("Peer address: {}", addr);
-//
-//     let ws_stream = tokio_tungstenite::accept_async(stream)
-//         .await
-//         .expect("Error during the websocket handshake occurred");
-//
-//     info!("New WebSocket connection: {}", addr);
-//
-//     let (mut write, mut read) = ws_stream.split();
-//
-//     // We should not forward messages other than text or binary.
-//     while let Some(msg) = read.try_next().await.unwrap_or(None) {
-//         if msg.is_text() || msg.is_binary() {
-//             if let Err(e) = write
-//                 .send(format!("This is a message {}!", msg.to_text().unwrap_or("")).into())
-//                 .await
-//             {
-//                 eprintln!("send error: {}", e);
-//                 break;
-//             }
-//         }
-//     }
-//
-//     info!("Disconnected from {}", addr);
-// }
-
 async fn accept_connection(stream: TcpStream) {
     let addr = stream
         .peer_addr()
@@ -125,56 +51,51 @@ async fn accept_connection(stream: TcpStream) {
     let (mut write, mut read) = ws_stream.split();
 
     // Each connection gets its own evaluator
-    let mut evaluator = Evaluator::new();
+    let mut grid = Grid::new();
 
     while let Some(msg) = read.try_next().await.unwrap_or(None) {
         if msg.is_text() {
-            let input = msg.to_text().unwrap_or("").trim().to_string();
+            let input = msg.to_text().unwrap();
 
-            let cmds = ["set", "get"];
-            let cmd = &input[0..3.min(input.len())]; // avoid panic on short strings
+            if let Ok(req) = serde_json::from_str::<LeadMsg>(&input) {
+                match req.msg_type {
+                    MsgType::Set => {
+                        let Some(cell_ref) = req.cell else { continue };
+                        let Some(raw) = req.raw else { continue };
 
-            if !cmds.iter().any(|c| c == &cmd) {
-                let _ = write
-                    .send(format!("ERR invalid command: {}", input).into())
-                    .await;
-                continue;
-            }
-
-            let rest = input[4..].trim();
-            let mut parts = rest.splitn(2, char::is_whitespace);
-
-            let raw_ref = parts.next().unwrap_or("").trim(); // cell reference
-            let raw_str = parts.next().unwrap_or("").trim(); // rest (value)
-
-            if let Ok(cell_ref) = CellRef::new(raw_ref.to_owned()) {
-                match cmd {
-                    "set" => match evaluator.set_cell(cell_ref.clone(), raw_str.to_owned()) {
-                        Ok(eval) => {
-                            let _ = write.send(format!("{} {}", raw_ref, eval).into()).await;
+                        match grid.set_cell(cell_ref.clone(), raw.to_owned()) {
+                            Ok(eval) => match eval {
+                                Eval::Literal(lit) => {
+                                    let res = LeadMsg {
+                                        msg_type: MsgType::Set,
+                                        cell: Some(cell_ref),
+                                        raw: Some(raw.to_string()),
+                                        eval: Some(lit),
+                                    };
+                                    let _ = write
+                                        .send(serde_json::to_string(&res).unwrap().into())
+                                        .await;
+                                }
+                            },
+                            Err(e) => {
+                                let res = LeadMsg {
+                                    msg_type: MsgType::Error,
+                                    cell: Some(cell_ref),
+                                    raw: Some(e.to_string()),
+                                    eval: None,
+                                };
+                                let _ = write
+                                    .send(serde_json::to_string(&res).unwrap().into())
+                                    .await;
+                            }
                         }
-                        Err(e) => {
-                            let _ = write.send(format!("ERR {}", e).into()).await;
-                        }
-                    },
-                    "get" => match evaluator.get_cell(cell_ref.clone()) {
-                        Ok(res) => {
-                            let _ = write
-                                .send(format!("{} {}", raw_ref, res.to_string()).into())
-                                .await;
-                        }
-                        Err(e) => {
-                            let _ = write.send(format!("ERR {}", e).into()).await;
-                        }
-                    },
+                    }
                     _ => {
-                        let _ = write.send("ERR impossible".into()).await;
+                        continue; // handle other cases
                     }
                 }
             } else {
-                let _ = write
-                    .send(format!("ERR invalid cell reference: {}", raw_ref).into())
-                    .await;
+                continue;
             }
         }
     }

backend/src/messages.rs

@@ -0,0 +1,19 @@
+use serde::{Deserialize, Serialize};
+
+use crate::{cell::CellRef, tokenizer::Literal};
+
+#[derive(Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum MsgType {
+    Set,
+    Get,
+    Error,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct LeadMsg {
+    pub msg_type: MsgType,
+    pub cell: Option<CellRef>,
+    pub raw: Option<String>,
+    pub eval: Option<Literal>,
+}

backend/src/parser.rs

@@ -169,11 +169,9 @@ pub fn _parse(
 ) -> Result<Expr, String> {
     let mut lhs = match input.next() {
         Token::Literal(it) => Expr::Literal(it),
-        Token::Identifier(id) if id == "true" => Expr::Literal(Literal::Boolean(true)),
-        Token::Identifier(id) if id == "false" => Expr::Literal(Literal::Boolean(false)),
-        Token::Paren('(') => {
+        Token::OpenParen => {
             let lhs = _parse(input, 0, deps)?;
-            if input.next() != Token::Paren(')') {
+            if input.next() != Token::CloseParen {
                 return Err(format!("Parse error: expected closing paren."));
             }
             Expr::Group(Box::new(lhs))
@@ -194,14 +192,14 @@ pub fn _parse(
             }
         }
         Token::Identifier(id) => match input.peek() {
-            Token::Paren('(') => {
+            Token::OpenParen => {
                 input.next();
 
                 let mut args: Vec<Expr> = Vec::new();
                 loop {
                     let nxt = input.peek();
 
-                    if nxt == Token::Paren(')') {
+                    if nxt == Token::CloseParen {
                         input.next();
                         break;
                     } else if nxt != Token::Comma && args.len() != 0 {
@@ -286,6 +284,5 @@ pub fn _parse(
         }
     }
 
-
     Ok(lhs)
 }

backend/src/tokenizer.rs

@@ -1,7 +1,9 @@
-#[derive(Debug, Clone, PartialEq)]
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(tag = "type", content = "value")]
 pub enum Literal {
-    Integer(i64),
-    Double(f64),
+    Number(f64),
     Boolean(bool),
     String(String),
 }
@@ -11,7 +13,8 @@ pub enum Token {
     Identifier(String), // Could be a function
     Literal(Literal),
     Operator(char),
-    Paren(char),
+    OpenParen,
+    CloseParen,
     Comma,
     Eof,
 }
@@ -39,29 +42,38 @@ impl Tokenizer {
                         break;
                     }
                 }
-                tokens.push(Token::Identifier(ident));
+                let res = match ident.as_str() {
+                    "true" => Token::Literal(Literal::Boolean(true)),
+                    "false" => Token::Literal(Literal::Boolean(false)),
+                    it => Token::Identifier(it.into()),
+                };
+
+                tokens.push(res);
             } else if c.is_ascii_digit() {
                 // parse number
                 let mut number = String::new();
                 let mut is_decimal = false;
+                let mut is_exp = false;
 
                 while let Some(&ch) = chars.peek() {
                     if ch.is_ascii_digit() {
                         number.push(ch);
                         chars.next();
-                    } else if ch == '.' && !is_decimal {
+                    } else if ch == '.' && !is_decimal && !is_exp {
                         is_decimal = true;
                         number.push(ch);
                         chars.next();
+                    } else if ch == 'e' && !is_decimal && !is_exp {
+                        is_exp = true;
+                        number.push(ch);
+                        chars.next();
                     } else {
                         break;
                     }
                 }
-                if is_decimal {
-                    tokens.push(Token::Literal(Literal::Double(number.parse().unwrap())))
-                } else {
-                    tokens.push(Token::Literal(Literal::Integer(number.parse().unwrap())))
-                };
+
+                // TODO: REMOVE UNWRAP
+                tokens.push(Token::Literal(Literal::Number(number.parse().unwrap())));
             } else if c == '"' || c == '\'' {
                 // parse string literal
                 let mut string = String::new();
@@ -89,7 +101,11 @@ impl Tokenizer {
                 tokens.push(Token::Operator(c));
                 chars.next();
             } else if "()".contains(c) {
-                tokens.push(Token::Paren(c));
+                if c == '(' {
+                    tokens.push(Token::OpenParen);
+                } else {
+                    tokens.push(Token::CloseParen);
+                }
                 chars.next();
             } else if c == ',' {
                 tokens.push(Token::Comma);
@@ -116,20 +132,140 @@ mod tests {
     use super::*;
 
     #[test]
-    fn test_tokenizer() {
-        let raw = "hello hello 1.23 this 5 (1+2)";
-        let expected: Vec<Token> = vec![
-            Token::Identifier("hello".to_string()),
-            Token::Identifier("hello".to_string()),
-            Token::Literal(Literal::Double(1.23)),
-            Token::Identifier("this".to_string()),
-            Token::Literal(Literal::Integer(5)),
-            Token::Paren('('),
-            Token::Literal(Literal::Integer(1)),
+    fn test_single_token() {
+        assert_eq!(
+            Tokenizer::new("1").unwrap().tokens,
+            Vec::from([Token::Literal(Literal::Number(1.0))])
+        );
+        assert_eq!(
+            Tokenizer::new("2.0").unwrap().tokens,
+            Vec::from([Token::Literal(Literal::Number(2.0))])
+        );
+        assert_eq!(
+            Tokenizer::new("\"hello\"").unwrap().tokens,
+            Vec::from([Token::Literal(Literal::String("hello".into()))])
+        );
+        assert_eq!(
+            Tokenizer::new("\'hello\'").unwrap().tokens,
+            Vec::from([Token::Literal(Literal::String("hello".into()))])
+        );
+        assert_eq!(
+            Tokenizer::new("hello").unwrap().tokens,
+            Vec::from([Token::Identifier("hello".into())])
+        );
+        assert_eq!(
+            Tokenizer::new("+").unwrap().tokens,
+            Vec::from([Token::Operator('+')])
+        );
+        assert_eq!(
+            Tokenizer::new(",").unwrap().tokens,
+            Vec::from([Token::Comma])
+        );
+        assert_eq!(
+            Tokenizer::new(")").unwrap().tokens,
+            Vec::from([Token::CloseParen])
+        );
+        assert_eq!(
+            Tokenizer::new("(").unwrap().tokens,
+            Vec::from([Token::OpenParen])
+        );
+    }
+
+    #[test]
+    fn test_token_punctuation() {
+        let mut exp = Vec::from([
+            Token::Comma,
+            Token::CloseParen,
+            Token::Comma,
+            Token::OpenParen,
+        ]);
+        exp.reverse();
+
+        assert_eq!(Tokenizer::new(", ) , (").unwrap().tokens, exp);
+    }
+
+    #[test]
+    fn test_token_operators() {
+        let mut exp = Vec::from([
             Token::Operator('+'),
-            Token::Literal(Literal::Integer(2)),
-            Token::Paren(')'),
+            Token::Operator('-'),
+            Token::Operator('*'),
+            Token::Operator('/'),
+            Token::Operator('^'),
+            Token::Operator('!'),
+            Token::Operator('%'),
+            Token::Operator('&'),
+            Token::Operator('|'),
+        ]);
+        exp.reverse();
+
+        assert_eq!(Tokenizer::new("+-*/^!%&|").unwrap().tokens, exp);
+    }
+
+    #[test]
+    fn test_token_string() {
+        let raw = "\"hello\" \'world\'";
+        let mut expected: Vec<Token> = vec![
+            Token::Literal(Literal::String("hello".into())),
+            Token::Literal(Literal::String("world".into())),
         ];
+        expected.reverse();
+        let t = Tokenizer::new(&raw).unwrap();
+        assert_eq!(t.tokens, expected);
+    }
+
+    #[test]
+    fn test_token_number() {
+        let raw = "123 4.56";
+        let mut expected: Vec<Token> = vec![
+            Token::Literal(Literal::Number(123.0)),
+            Token::Literal(Literal::Number(4.56)),
+        ];
+        expected.reverse();
+        let t = Tokenizer::new(&raw).unwrap();
+        assert_eq!(t.tokens, expected);
+    }
+
+    #[test]
+    fn test_token_boolean() {
+        let raw = "false true";
+        let mut expected: Vec<Token> = vec![
+            Token::Literal(Literal::Boolean(false)),
+            Token::Literal(Literal::Boolean(true)),
+        ];
+        expected.reverse();
+        let t = Tokenizer::new(&raw).unwrap();
+        assert_eq!(t.tokens, expected);
+    }
+
+    #[test]
+    fn test_token_identifier() {
+        let raw = "hello test";
+        let mut expected: Vec<Token> = vec![
+            Token::Identifier("hello".to_string()),
+            Token::Identifier("test".to_string()),
+        ];
+        expected.reverse();
+        let t = Tokenizer::new(&raw).unwrap();
+        assert_eq!(t.tokens, expected);
+    }
+
+    #[test]
+    fn test_token_mix() {
+        let raw = "hello test 1.23 this 5 (1+2)";
+        let mut expected: Vec<Token> = vec![
+            Token::Identifier("hello".to_string()),
+            Token::Identifier("test".to_string()),
+            Token::Literal(Literal::Number(1.23)),
+            Token::Identifier("this".to_string()),
+            Token::Literal(Literal::Number(5.0)),
+            Token::OpenParen,
+            Token::Literal(Literal::Number(1.0)),
+            Token::Operator('+'),
+            Token::Literal(Literal::Number(2.0)),
+            Token::CloseParen,
+        ];
+        expected.reverse();
         let t = Tokenizer::new(&raw).unwrap();
         assert_eq!(t.tokens, expected);
     }