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stack.go
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stack.go
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package jsonpath
// Integer Stack
type intStack struct {
values []int
}
func newIntStack() *intStack {
return &intStack{
values: make([]int, 0, 100),
}
}
func (s *intStack) len() int {
return len(s.values)
}
func (s *intStack) push(r int) {
s.values = append(s.values, r)
}
func (s *intStack) pop() (int, bool) {
if s.len() == 0 {
return 0, false
}
v, _ := s.peek()
s.values = s.values[:len(s.values)-1]
return v, true
}
func (s *intStack) peek() (int, bool) {
if s.len() == 0 {
return 0, false
}
v := s.values[len(s.values)-1]
return v, true
}
// Interface Stack
type stack struct {
values []interface{}
}
func newStack() *stack {
return &stack{
values: make([]interface{}, 0, 100),
}
}
func (s *stack) len() int {
return len(s.values)
}
func (s *stack) push(r interface{}) {
s.values = append(s.values, r)
}
func (s *stack) pop() (interface{}, bool) {
if s.len() == 0 {
return nil, false
}
v, _ := s.peek()
s.values = s.values[:len(s.values)-1]
return v, true
}
func (s *stack) peek() (interface{}, bool) {
if s.len() == 0 {
return nil, false
}
v := s.values[len(s.values)-1]
return v, true
}
func (s *stack) clone() *stack {
d := stack{
values: make([]interface{}, s.len()),
}
copy(d.values, s.values)
return &d
}
func (s *stack) toArray() []interface{} {
return s.values
}