Fied evaluator bug

src/board.rs

@@ -1,4 +1,4 @@
-use std::fmt::Display;
+use std::{fmt::Display, num::NonZeroU8};
 use termion::color;
 
 use crate::{Player, Symb};
@@ -47,6 +47,7 @@ impl Display for Board {
 	}
 }
 
+#[allow(dead_code)]
 impl Board {
 	pub fn new(current_player: Player) -> Self {
 		Self {
@@ -56,6 +57,14 @@ impl Board {
 		}
 	}
 
+	pub fn iter(&self) -> impl Iterator<Item = &Option<(Symb, Player)>> {
+		self.board.iter()
+	}
+
+	pub fn get(&self, idx: usize) -> Option<&Option<(Symb, Player)>> {
+		self.board.get(idx)
+	}
+
 	pub fn current_player(&self) -> Player {
 		self.current_player
 	}
@@ -68,6 +77,18 @@ impl Board {
 		self.board.len()
 	}
 
+	pub fn contains(&self, s: Symb) -> bool {
+		for i in &self.board {
+			if let Some(i) = i {
+				if i.0 == s {
+					return true;
+				}
+			}
+		}
+
+		false
+	}
+
 	// Place the marked symbol at the given position.
 	// Returns true for valid moves and false otherwise.
 	pub fn play(&mut self, cursor: usize, symb: Symb) -> bool {
@@ -75,13 +96,9 @@ impl Board {
 			Some(_) => return false,
 			None => {
 				// Check for duplicate symbols
-				for i in &self.board {
-					if let Some(i) = i {
-						if i.0 == symb {
+				if self.contains(symb) {
 					return false;
 				}
-					}
-				}
 
 				// Check syntax
 				match symb {
@@ -91,7 +108,7 @@ impl Board {
 						}
 
 						let r = &self.board[cursor + 1];
-						if r.is_some_and(|(s, _)| s.is_binop()) {
+						if r.is_some_and(|(s, _)| s.is_op() && !s.is_minus()) {
 							return false;
 						}
 					}
@@ -117,9 +134,7 @@ impl Board {
 							return false;
 						}
 
-						if l.is_some_and(|s| s.is_binop() || s.is_minus())
-							|| r.is_some_and(|s| s.is_binop())
-						{
+						if l.is_some_and(|s| s.is_op()) {
 							return false;
 						}
 					}
@@ -192,13 +207,21 @@ impl Board {
 
 		tokens.push(Token::Number(current_num * current_sgn));
 
-		for op in [Token::OpMult, Token::OpDiv, Token::OpAdd, Token::OpSub] {
+		let mut priority_level = 0;
+		let mut did_something;
+		while tokens.len() > 1 {
+			did_something = false;
 			for i in 0..tokens.len() {
-				if tokens[i] == op {
+				if match priority_level {
+					0 => matches!(tokens[i], Token::OpMult | Token::OpDiv),
+					1 => matches!(tokens[i], Token::OpAdd | Token::OpSub),
+					_ => false,
+				} {
+					did_something = true;
 					let l = &tokens[i - 1];
 					let r = &tokens[i + 1];
 
-					let v = match op {
+					let v = match tokens[i] {
 						Token::OpAdd => l.val() + r.val(),
 						Token::OpDiv => l.val() / r.val(),
 						Token::OpSub => l.val() - r.val(),
@@ -212,8 +235,63 @@ impl Board {
 					break;
 				}
 			}
+
+			if !did_something {
+				priority_level += 1;
+			}
 		}
 
-		return Some(tokens[0].val());
+		Some(tokens[0].val())
+	}
+
+	/// Hacky method to parse a board from a string
+	pub fn from_string(s: &str, current_player: Player) -> Option<Self> {
+		if s.len() != 11 {
+			return None;
+		}
+
+		let x = s
+			.chars()
+			.filter_map(|c| {
+				let symb = match c {
+					'+' => Symb::Plus,
+					'-' => Symb::Minus,
+					'*' => Symb::Times,
+					'/' => Symb::Div,
+					'0' => Symb::Zero,
+					'1' => Symb::Number(NonZeroU8::new(1).unwrap()),
+					'2' => Symb::Number(NonZeroU8::new(2).unwrap()),
+					'3' => Symb::Number(NonZeroU8::new(3).unwrap()),
+					'4' => Symb::Number(NonZeroU8::new(4).unwrap()),
+					'5' => Symb::Number(NonZeroU8::new(5).unwrap()),
+					'6' => Symb::Number(NonZeroU8::new(6).unwrap()),
+					'7' => Symb::Number(NonZeroU8::new(7).unwrap()),
+					'8' => Symb::Number(NonZeroU8::new(8).unwrap()),
+					'9' => Symb::Number(NonZeroU8::new(9).unwrap()),
+					'_' => return Some(None),
+					_ => return None,
+				};
+				Some(Some((symb, current_player)))
+			})
+			.collect::<Vec<_>>();
+
+		if x.len() != 11 {
+			return None;
+		}
+
+		let mut free_spots = 11;
+		let mut board = [None; 11];
+		for i in 0..x.len() {
+			board[i] = x[i];
+			if x[i].is_some() {
+				free_spots -= 1;
+			}
+		}
+
+		Some(Self {
+			board,
+			free_spots,
+			current_player,
+		})
 	}
 }