- refactor all iterators and enumerables into separate files

stacks/arraystack/arraystack.go

@@ -33,15 +33,13 @@ package arraystack
 
 import (
 	"fmt"
-	"github.com/emirpasic/gods/containers"
 	"github.com/emirpasic/gods/lists/arraylist"
 	"github.com/emirpasic/gods/stacks"
 	"strings"
 )
 
-func assertInterfaceImplementation() {
+func assertStackImplementation() {
 	var _ stacks.Stack = (*Stack)(nil)
-	var _ containers.ReverseIteratorWithIndex = (*Iterator)(nil)
 }
 
 // Stack holds elements in an array-list
@@ -98,79 +96,6 @@ func (stack *Stack) Values() []interface{} {
 	return elements
 }
 
-// Iterator returns a stateful iterator whose values can be fetched by an index.
-type Iterator struct {
-	stack *Stack
-	index int
-}
-
-// Iterator returns a stateful iterator whose values can be fetched by an index.
-func (stack *Stack) Iterator() Iterator {
-	return Iterator{stack: stack, index: -1}
-}
-
-// Next moves the iterator to the next element and returns true if there was a next element in the container.
-// If Next() returns true, then next element's index and value can be retrieved by Index() and Value().
-// If Next() was called for the first time, then it will point the iterator to the first element if it exists.
-// Modifies the state of the iterator.
-func (iterator *Iterator) Next() bool {
-	if iterator.index < iterator.stack.Size() {
-		iterator.index++
-	}
-	return iterator.stack.withinRange(iterator.index)
-}
-
-// Prev moves the iterator to the previous element and returns true if there was a previous element in the container.
-// If Prev() returns true, then previous element's index and value can be retrieved by Index() and Value().
-// Modifies the state of the iterator.
-func (iterator *Iterator) Prev() bool {
-	if iterator.index >= 0 {
-		iterator.index--
-	}
-	return iterator.stack.withinRange(iterator.index)
-}
-
-// Value returns the current element's value.
-// Does not modify the state of the iterator.
-func (iterator *Iterator) Value() interface{} {
-	value, _ := iterator.stack.list.Get(iterator.stack.list.Size() - iterator.index - 1) // in reverse (LIFO)
-	return value
-}
-
-// Index returns the current element's index.
-// Does not modify the state of the iterator.
-func (iterator *Iterator) Index() int {
-	return iterator.index
-}
-
-// Begin resets the iterator to its initial state (one-before-first)
-// Call Next() to fetch the first element if any.
-func (iterator *Iterator) Begin() {
-	iterator.index = -1
-}
-
-// End moves the iterator past the last element (one-past-the-end).
-// Call Prev() to fetch the last element if any.
-func (iterator *Iterator) End() {
-	iterator.index = iterator.stack.Size()
-}
-
-// First moves the iterator to the first element and returns true if there was a first element in the container.
-// If First() returns true, then first element's index and value can be retrieved by Index() and Value().
-// Modifies the state of the iterator.
-func (iterator *Iterator) First() bool {
-	iterator.Begin()
-	return iterator.Next()
-}
-
-// Last moves the iterator to the last element and returns true if there was a last element in the container.
-// If Last() returns true, then last element's index and value can be retrieved by Index() and Value().
-// Modifies the state of the iterator.
-func (iterator *Iterator) Last() bool {
-	iterator.End()
-	return iterator.Prev()
-}
-
 // String returns a string representation of container
 func (stack *Stack) String() string {
 	str := "ArrayStack\n"