From 73be31dd27be4d5aa4b0c0d02828c099f49fb2c7 Mon Sep 17 00:00:00 2001
From: c0repwn3r <core@coredoes.dev>
Date: Sun, 12 Feb 2023 22:19:20 -0500
Subject: [PATCH] fail miserably at parsing fen (i have failed in the same way
 like 7! times now)

---
 src/board.rs      | 40 ++++++++++++++++++++++++++++++++++++++--
 src/boardfield.rs |  2 +-
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/src/board.rs b/src/board.rs
index 1811844..c947204 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -90,7 +90,41 @@ impl Board {
         let mut piecelist = Vec::new();
         let mut bitfield = Boardfield::new();
 
+        let mut rank = 0;
+        let mut file = 0;
 
+        // parse component 1: piece data
+        for char in components[0].chars() {
+            match char {
+                'r' | 'n' | 'b' | 'q' | 'k' | 'p' | 'R' | 'N' | 'B' | 'Q' | 'K' | 'P' => {
+                    piecelist.push(create_fen_piece(char, 8 - rank, file)?);
+                    bitfield.set_pos(((8 - rank) + file * 8) - 1, create_bitfield_piece(char)?);
+                    file += 1;
+                },
+                _ if char.is_numeric() => {
+                    let num = char.to_digit(10).unwrap() as usize;
+
+                    if !(1..=8).contains(&num) {
+                        return Err(FENParseError::CannotSkipToOutsideOfBoard {got: num, which_is: num})
+                    }
+
+                    if file + num > 8 {
+                        return Err(FENParseError::CannotSkipToOutsideOfBoard {got: num, which_is: file + num})
+                    }
+
+                    file += num;
+                },
+                '/' => {
+                    if rank == 8 {
+                        return Err(FENParseError::CannotSkipToOutsideOfBoard { got: 1, which_is: file + 1 })
+                    }
+
+                    rank += 1;
+                    file = 0;
+                }
+                _ => return Err(FENParseError::InvalidPieceCharacter {got: char})
+            }
+        }
 
         Ok(Self {
             bitfield,
@@ -133,14 +167,16 @@ fn create_bitfield_piece(c: char) -> Result<u8, FENParseError> {
         'n' => Ok(PieceColor::Black as u8 | PieceType::Knight as u8),
         'b' => Ok(PieceColor::Black as u8 | PieceType::Bishop as u8),
         'q' => Ok(PieceColor::Black as u8 | PieceType::Queen as u8),
-        'k' => Ok(PieceColor::Black as u8 | PieceType::Knight as u8),
+        'k' => Ok(PieceColor::Black as u8 | PieceType::King as u8),
         'p' => Ok(PieceColor::Black as u8 | PieceType::Pawn as u8),
+
         'R' => Ok(PieceColor::White as u8 | PieceType::Rook as u8),
         'N' => Ok(PieceColor::White as u8 | PieceType::Knight as u8),
         'B' => Ok(PieceColor::White as u8 | PieceType::Bishop as u8),
         'Q' => Ok(PieceColor::White as u8 | PieceType::Queen as u8),
-        'K' => Ok(PieceColor::White as u8 | PieceType::Knight as u8),
+        'K' => Ok(PieceColor::White as u8 | PieceType::King as u8),
         'P' => Ok(PieceColor::White as u8 | PieceType::Pawn as u8),
+
         _ => Err(FENParseError::InvalidPieceCharacter { got: c })
     }
 }
diff --git a/src/boardfield.rs b/src/boardfield.rs
index b1ca6d8..c26b0b0 100644
--- a/src/boardfield.rs
+++ b/src/boardfield.rs
@@ -101,7 +101,7 @@ impl BoardfieldOps for Boardfield {
 
     fn set_pos(&mut self, boardloc: usize, piece: u8) {
         if boardloc > 63 {
-            panic!("boardloc out of range");
+            panic!("boardloc out of range {}", boardloc);
         }
 
         let field = self[boardloc / 2];