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73 lines
1.7 KiB
73 lines
1.7 KiB
//
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// DISCLAIMER
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//
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// Copyright 2017 ArangoDB GmbH, Cologne, Germany
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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// Author Ewout Prangsma
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//
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package velocypack
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// builderStack is a stack of positions.
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type builderStack struct {
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stack []ValueLength
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bootstrap [4]ValueLength
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}
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// Push the given value on top of the stack
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func (s *builderStack) Push(v ValueLength) {
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if s.stack == nil {
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s.stack = s.bootstrap[0:1]
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s.stack[0] = v
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} else {
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s.stack = append(s.stack, v)
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}
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}
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// Pop removes the top of the stack.
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func (s *builderStack) Pop() {
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l := len(s.stack)
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if l > 0 {
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s.stack = s.stack[:l-1]
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}
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}
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func (s *builderStack) Clear() {
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s.stack = nil
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}
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// Tos returns the value at the top of the stack.
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// Returns <value at top of stack>, <stack length>
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func (s builderStack) Tos() (ValueLength, int) {
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// _s := *s
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l := len(s.stack)
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if l > 0 {
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return (s.stack)[l-1], l
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}
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return 0, 0
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}
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// IsEmpty returns true if there are no values on the stack.
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func (s builderStack) IsEmpty() bool {
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l := len(s.stack)
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return l == 0
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}
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// Len returns the number of elements of the stack.
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func (s builderStack) Len() int {
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return len(s.stack)
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}
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