Method undo_commit

chrs-lib/src/data/mod.rs:271–304

(&mut self, commit: &MoveCommit)

    }

    pub fn undo_commit(&mut self, commit: &MoveCommit) {
        let pcolor = commit.m.p.get_color();

        use MoveType::*;
        match commit.m.move_type {
            Normal => self.undo_normal(&commit),
            DoublePush => self.undo_double_push(&commit),
            EnPassant => self.undo_en_passant(&commit),
            Castle(castle_type) => self.undo_castle(&commit, castle_type),
            Promotion(prom) => {
                if let Some(prom) = prom {
                    self.undo_promotion(&commit, prom);
                } else {
                    log::error!("Promotion Move has no promotion piece assigned to it");
                    panic!();
                }
            }
        }

        if pcolor == Color::Black {
            self.fullmove_number -= 1;
        }
        if let Some(t) = commit.ep_target {
            self.set_ep_target(t);
        } else {
            self.clear_ep_target();
        }
        let oldcastleflags = self.castle_flags.0 ^ commit.castledelta.0;
        update_castle(self.castle_flags.raw(), &mut self.hash);
        update_castle(oldcastleflags, &mut self.hash);
        self.castle_flags = CastleFlags(oldcastleflags);
        self.halfmove_clock -= 1;
        self.toggle_active_color();
    }

    fn undo_normal(&mut self, commit: &MoveCommit) {
        self.move_piece(commit.m.p, commit.m.to, commit.m.from);