refactored to correctly use module structure

stack.go

@@ -1,39 +0,0 @@
-/*   SHS: Syntactically Homogeneous Shell
- *   Copyright (C) 2019  Aidan Hahn
- *
- *   This program is free software: you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation, either version 3 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License
- *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package shs
-
-type TokenStack struct {
-    buffer []*Token
-    capacity int
-}
-
-func (s *TokenStack) Push(v *Token) {
-    s.capacity++
-    s.buffer = append(s.buffer, v)
-}
-
-func (s *TokenStack) Pop() *Token {
-    if s.capacity <= 0 {
-        return nil
-    }
-
-    s.capacity--
-    res := s.buffer[len(s.buffer) - 1]
-    s.buffer = s.buffer[:len(s.buffer) - 1]
-    return res
-}