103 lines
1.4 KiB
Go
103 lines
1.4 KiB
Go
package lastack
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import (
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"github.com/474420502/focus/stack"
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"github.com/davecgh/go-spew/spew"
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)
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type Node struct {
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value interface{}
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down *Node
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}
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type Stack struct {
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top *Node
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size uint
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}
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func assertImplementation() {
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var _ stack.IStack = (*Stack)(nil)
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}
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func New() *Stack {
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s := &Stack{}
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s.size = 0
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return s
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}
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func (as *Stack) Clear() {
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as.size = 0
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as.top = nil
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}
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func (as *Stack) Empty() bool {
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return as.size == 0
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}
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func (as *Stack) Size() uint {
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return as.size
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}
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// String 从左到右 左边第一个表示Top 如链表 a(top)->b->c
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func (as *Stack) String() string {
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content := ""
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cur := as.top
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for ; cur != nil; cur = cur.down {
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content += spew.Sprint(cur.value) + " "
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}
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if len(content) > 0 {
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content = content[0 : len(content)-1]
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} else {
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content = ""
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}
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return content
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}
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func (as *Stack) Values() []interface{} {
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if as.size == 0 {
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return nil
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}
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result := make([]interface{}, as.size, as.size)
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cur := as.top
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n := 0
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for ; cur != nil; cur = cur.down {
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result[n] = cur.value
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n++
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}
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return result
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}
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func (as *Stack) Push(v interface{}) {
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nv := &Node{value: v}
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nv.down = as.top
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as.top = nv
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as.size++
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}
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func (as *Stack) Pop() (interface{}, bool) {
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if as.size == 0 {
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return nil, false
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}
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as.size--
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result := as.top
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as.top = as.top.down
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result.down = nil
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return result.value, true
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}
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func (as *Stack) Peek() (interface{}, bool) {
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if as.size == 0 {
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return nil, false
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}
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return as.top.value, true
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}
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