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