feat: switch glide to govendor. (#186)

* feat: switch glide to govendor.

* fix: testing

vendor/github.com/emirpasic/gods/trees/redblacktree/iterator.go

@@ -0,0 +1,156 @@
+// Copyright (c) 2015, Emir Pasic. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package redblacktree
+
+import "github.com/emirpasic/gods/containers"
+
+func assertIteratorImplementation() {
+	var _ containers.ReverseIteratorWithKey = (*Iterator)(nil)
+}
+
+// Iterator holding the iterator's state
+type Iterator struct {
+	tree     *Tree
+	node     *Node
+	position position
+}
+
+type position byte
+
+const (
+	begin, between, end position = 0, 1, 2
+)
+
+// Iterator returns a stateful iterator whose elements are key/value pairs.
+func (tree *Tree) Iterator() Iterator {
+	return Iterator{tree: tree, node: nil, position: begin}
+}
+
+// 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 key and value can be retrieved by Key() 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.position == end {
+		goto end
+	}
+	if iterator.position == begin {
+		left := iterator.tree.Left()
+		if left == nil {
+			goto end
+		}
+		iterator.node = left
+		goto between
+	}
+	if iterator.node.Right != nil {
+		iterator.node = iterator.node.Right
+		for iterator.node.Left != nil {
+			iterator.node = iterator.node.Left
+		}
+		goto between
+	}
+	if iterator.node.Parent != nil {
+		node := iterator.node
+		for iterator.node.Parent != nil {
+			iterator.node = iterator.node.Parent
+			if iterator.tree.Comparator(node.Key, iterator.node.Key) <= 0 {
+				goto between
+			}
+		}
+	}
+
+end:
+	iterator.node = nil
+	iterator.position = end
+	return false
+
+between:
+	iterator.position = between
+	return true
+}
+
+// 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 key and value can be retrieved by Key() and Value().
+// Modifies the state of the iterator.
+func (iterator *Iterator) Prev() bool {
+	if iterator.position == begin {
+		goto begin
+	}
+	if iterator.position == end {
+		right := iterator.tree.Right()
+		if right == nil {
+			goto begin
+		}
+		iterator.node = right
+		goto between
+	}
+	if iterator.node.Left != nil {
+		iterator.node = iterator.node.Left
+		for iterator.node.Right != nil {
+			iterator.node = iterator.node.Right
+		}
+		goto between
+	}
+	if iterator.node.Parent != nil {
+		node := iterator.node
+		for iterator.node.Parent != nil {
+			iterator.node = iterator.node.Parent
+			if iterator.tree.Comparator(node.Key, iterator.node.Key) >= 0 {
+				goto between
+			}
+		}
+	}
+
+begin:
+	iterator.node = nil
+	iterator.position = begin
+	return false
+
+between:
+	iterator.position = between
+	return true
+}
+
+// Value returns the current element's value.
+// Does not modify the state of the iterator.
+func (iterator *Iterator) Value() interface{} {
+	return iterator.node.Value
+}
+
+// Key returns the current element's key.
+// Does not modify the state of the iterator.
+func (iterator *Iterator) Key() interface{} {
+	return iterator.node.Key
+}
+
+// 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.node = nil
+	iterator.position = begin
+}
+
+// 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.node = nil
+	iterator.position = end
+}
+
+// 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 key and value can be retrieved by Key() 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 key and value can be retrieved by Key() and Value().
+// Modifies the state of the iterator.
+func (iterator *Iterator) Last() bool {
+	iterator.End()
+	return iterator.Prev()
+}

vendor/github.com/emirpasic/gods/trees/redblacktree/redblacktree.go

@@ -0,0 +1,522 @@
+// Copyright (c) 2015, Emir Pasic. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package redblacktree implements a red-black tree.
+//
+// Used by TreeSet and TreeMap.
+//
+// Structure is not thread safe.
+//
+// References: http://en.wikipedia.org/wiki/Red%E2%80%93black_tree
+package redblacktree
+
+import (
+	"fmt"
+	"github.com/emirpasic/gods/trees"
+	"github.com/emirpasic/gods/utils"
+)
+
+func assertTreeImplementation() {
+	var _ trees.Tree = (*Tree)(nil)
+}
+
+type color bool
+
+const (
+	black, red color = true, false
+)
+
+// Tree holds elements of the red-black tree
+type Tree struct {
+	Root       *Node
+	size       int
+	Comparator utils.Comparator
+}
+
+// Node is a single element within the tree
+type Node struct {
+	Key    interface{}
+	Value  interface{}
+	color  color
+	Left   *Node
+	Right  *Node
+	Parent *Node
+}
+
+// NewWith instantiates a red-black tree with the custom comparator.
+func NewWith(comparator utils.Comparator) *Tree {
+	return &Tree{Comparator: comparator}
+}
+
+// NewWithIntComparator instantiates a red-black tree with the IntComparator, i.e. keys are of type int.
+func NewWithIntComparator() *Tree {
+	return &Tree{Comparator: utils.IntComparator}
+}
+
+// NewWithStringComparator instantiates a red-black tree with the StringComparator, i.e. keys are of type string.
+func NewWithStringComparator() *Tree {
+	return &Tree{Comparator: utils.StringComparator}
+}
+
+// Put inserts node into the tree.
+// Key should adhere to the comparator's type assertion, otherwise method panics.
+func (tree *Tree) Put(key interface{}, value interface{}) {
+	insertedNode := &Node{Key: key, Value: value, color: red}
+	if tree.Root == nil {
+		tree.Root = insertedNode
+	} else {
+		node := tree.Root
+		loop := true
+		for loop {
+			compare := tree.Comparator(key, node.Key)
+			switch {
+			case compare == 0:
+				node.Key = key
+				node.Value = value
+				return
+			case compare < 0:
+				if node.Left == nil {
+					node.Left = insertedNode
+					loop = false
+				} else {
+					node = node.Left
+				}
+			case compare > 0:
+				if node.Right == nil {
+					node.Right = insertedNode
+					loop = false
+				} else {
+					node = node.Right
+				}
+			}
+		}
+		insertedNode.Parent = node
+	}
+	tree.insertCase1(insertedNode)
+	tree.size++
+}
+
+// Get searches the node in the tree by key and returns its value or nil if key is not found in tree.
+// Second return parameter is true if key was found, otherwise false.
+// Key should adhere to the comparator's type assertion, otherwise method panics.
+func (tree *Tree) Get(key interface{}) (value interface{}, found bool) {
+	node := tree.lookup(key)
+	if node != nil {
+		return node.Value, true
+	}
+	return nil, false
+}
+
+// Remove remove the node from the tree by key.
+// Key should adhere to the comparator's type assertion, otherwise method panics.
+func (tree *Tree) Remove(key interface{}) {
+	var child *Node
+	node := tree.lookup(key)
+	if node == nil {
+		return
+	}
+	if node.Left != nil && node.Right != nil {
+		pred := node.Left.maximumNode()
+		node.Key = pred.Key
+		node.Value = pred.Value
+		node = pred
+	}
+	if node.Left == nil || node.Right == nil {
+		if node.Right == nil {
+			child = node.Left
+		} else {
+			child = node.Right
+		}
+		if node.color == black {
+			node.color = nodeColor(child)
+			tree.deleteCase1(node)
+		}
+		tree.replaceNode(node, child)
+		if node.Parent == nil && child != nil {
+			child.color = black
+		}
+	}
+	tree.size--
+}
+
+// Empty returns true if tree does not contain any nodes
+func (tree *Tree) Empty() bool {
+	return tree.size == 0
+}
+
+// Size returns number of nodes in the tree.
+func (tree *Tree) Size() int {
+	return tree.size
+}
+
+// Keys returns all keys in-order
+func (tree *Tree) Keys() []interface{} {
+	keys := make([]interface{}, tree.size)
+	it := tree.Iterator()
+	for i := 0; it.Next(); i++ {
+		keys[i] = it.Key()
+	}
+	return keys
+}
+
+// Values returns all values in-order based on the key.
+func (tree *Tree) Values() []interface{} {
+	values := make([]interface{}, tree.size)
+	it := tree.Iterator()
+	for i := 0; it.Next(); i++ {
+		values[i] = it.Value()
+	}
+	return values
+}
+
+// Left returns the left-most (min) node or nil if tree is empty.
+func (tree *Tree) Left() *Node {
+	var parent *Node
+	current := tree.Root
+	for current != nil {
+		parent = current
+		current = current.Left
+	}
+	return parent
+}
+
+// Right returns the right-most (max) node or nil if tree is empty.
+func (tree *Tree) Right() *Node {
+	var parent *Node
+	current := tree.Root
+	for current != nil {
+		parent = current
+		current = current.Right
+	}
+	return parent
+}
+
+// Floor Finds floor node of the input key, return the floor node or nil if no ceiling is found.
+// Second return parameter is true if floor was found, otherwise false.
+//
+// Floor node is defined as the largest node that is smaller than or equal to the given node.
+// A floor node may not be found, either because the tree is empty, or because
+// all nodes in the tree is larger than the given node.
+//
+// Key should adhere to the comparator's type assertion, otherwise method panics.
+func (tree *Tree) Floor(key interface{}) (floor *Node, found bool) {
+	found = false
+	node := tree.Root
+	for node != nil {
+		compare := tree.Comparator(key, node.Key)
+		switch {
+		case compare == 0:
+			return node, true
+		case compare < 0:
+			node = node.Left
+		case compare > 0:
+			floor, found = node, true
+			node = node.Right
+		}
+	}
+	if found {
+		return floor, true
+	}
+	return nil, false
+}
+
+// Ceiling finds ceiling node of the input key, return the ceiling node or nil if no ceiling is found.
+// Second return parameter is true if ceiling was found, otherwise false.
+//
+// Ceiling node is defined as the smallest node that is larger than or equal to the given node.
+// A ceiling node may not be found, either because the tree is empty, or because
+// all nodes in the tree is smaller than the given node.
+//
+// Key should adhere to the comparator's type assertion, otherwise method panics.
+func (tree *Tree) Ceiling(key interface{}) (ceiling *Node, found bool) {
+	found = false
+	node := tree.Root
+	for node != nil {
+		compare := tree.Comparator(key, node.Key)
+		switch {
+		case compare == 0:
+			return node, true
+		case compare < 0:
+			ceiling, found = node, true
+			node = node.Left
+		case compare > 0:
+			node = node.Right
+		}
+	}
+	if found {
+		return ceiling, true
+	}
+	return nil, false
+}
+
+// Clear removes all nodes from the tree.
+func (tree *Tree) Clear() {
+	tree.Root = nil
+	tree.size = 0
+}
+
+// String returns a string representation of container
+func (tree *Tree) String() string {
+	str := "RedBlackTree\n"
+	if !tree.Empty() {
+		output(tree.Root, "", true, &str)
+	}
+	return str
+}
+
+func (node *Node) String() string {
+	return fmt.Sprintf("%v", node.Key)
+}
+
+func output(node *Node, prefix string, isTail bool, str *string) {
+	if node.Right != nil {
+		newPrefix := prefix
+		if isTail {
+			newPrefix += "│   "
+		} else {
+			newPrefix += "    "
+		}
+		output(node.Right, newPrefix, false, str)
+	}
+	*str += prefix
+	if isTail {
+		*str += "└── "
+	} else {
+		*str += "┌── "
+	}
+	*str += node.String() + "\n"
+	if node.Left != nil {
+		newPrefix := prefix
+		if isTail {
+			newPrefix += "    "
+		} else {
+			newPrefix += "│   "
+		}
+		output(node.Left, newPrefix, true, str)
+	}
+}
+
+func (tree *Tree) lookup(key interface{}) *Node {
+	node := tree.Root
+	for node != nil {
+		compare := tree.Comparator(key, node.Key)
+		switch {
+		case compare == 0:
+			return node
+		case compare < 0:
+			node = node.Left
+		case compare > 0:
+			node = node.Right
+		}
+	}
+	return nil
+}
+
+func (node *Node) grandparent() *Node {
+	if node != nil && node.Parent != nil {
+		return node.Parent.Parent
+	}
+	return nil
+}
+
+func (node *Node) uncle() *Node {
+	if node == nil || node.Parent == nil || node.Parent.Parent == nil {
+		return nil
+	}
+	return node.Parent.sibling()
+}
+
+func (node *Node) sibling() *Node {
+	if node == nil || node.Parent == nil {
+		return nil
+	}
+	if node == node.Parent.Left {
+		return node.Parent.Right
+	}
+	return node.Parent.Left
+}
+
+func (tree *Tree) rotateLeft(node *Node) {
+	right := node.Right
+	tree.replaceNode(node, right)
+	node.Right = right.Left
+	if right.Left != nil {
+		right.Left.Parent = node
+	}
+	right.Left = node
+	node.Parent = right
+}
+
+func (tree *Tree) rotateRight(node *Node) {
+	left := node.Left
+	tree.replaceNode(node, left)
+	node.Left = left.Right
+	if left.Right != nil {
+		left.Right.Parent = node
+	}
+	left.Right = node
+	node.Parent = left
+}
+
+func (tree *Tree) replaceNode(old *Node, new *Node) {
+	if old.Parent == nil {
+		tree.Root = new
+	} else {
+		if old == old.Parent.Left {
+			old.Parent.Left = new
+		} else {
+			old.Parent.Right = new
+		}
+	}
+	if new != nil {
+		new.Parent = old.Parent
+	}
+}
+
+func (tree *Tree) insertCase1(node *Node) {
+	if node.Parent == nil {
+		node.color = black
+	} else {
+		tree.insertCase2(node)
+	}
+}
+
+func (tree *Tree) insertCase2(node *Node) {
+	if nodeColor(node.Parent) == black {
+		return
+	}
+	tree.insertCase3(node)
+}
+
+func (tree *Tree) insertCase3(node *Node) {
+	uncle := node.uncle()
+	if nodeColor(uncle) == red {
+		node.Parent.color = black
+		uncle.color = black
+		node.grandparent().color = red
+		tree.insertCase1(node.grandparent())
+	} else {
+		tree.insertCase4(node)
+	}
+}
+
+func (tree *Tree) insertCase4(node *Node) {
+	grandparent := node.grandparent()
+	if node == node.Parent.Right && node.Parent == grandparent.Left {
+		tree.rotateLeft(node.Parent)
+		node = node.Left
+	} else if node == node.Parent.Left && node.Parent == grandparent.Right {
+		tree.rotateRight(node.Parent)
+		node = node.Right
+	}
+	tree.insertCase5(node)
+}
+
+func (tree *Tree) insertCase5(node *Node) {
+	node.Parent.color = black
+	grandparent := node.grandparent()
+	grandparent.color = red
+	if node == node.Parent.Left && node.Parent == grandparent.Left {
+		tree.rotateRight(grandparent)
+	} else if node == node.Parent.Right && node.Parent == grandparent.Right {
+		tree.rotateLeft(grandparent)
+	}
+}
+
+func (node *Node) maximumNode() *Node {
+	if node == nil {
+		return nil
+	}
+	for node.Right != nil {
+		node = node.Right
+	}
+	return node
+}
+
+func (tree *Tree) deleteCase1(node *Node) {
+	if node.Parent == nil {
+		return
+	}
+	tree.deleteCase2(node)
+}
+
+func (tree *Tree) deleteCase2(node *Node) {
+	sibling := node.sibling()
+	if nodeColor(sibling) == red {
+		node.Parent.color = red
+		sibling.color = black
+		if node == node.Parent.Left {
+			tree.rotateLeft(node.Parent)
+		} else {
+			tree.rotateRight(node.Parent)
+		}
+	}
+	tree.deleteCase3(node)
+}
+
+func (tree *Tree) deleteCase3(node *Node) {
+	sibling := node.sibling()
+	if nodeColor(node.Parent) == black &&
+		nodeColor(sibling) == black &&
+		nodeColor(sibling.Left) == black &&
+		nodeColor(sibling.Right) == black {
+		sibling.color = red
+		tree.deleteCase1(node.Parent)
+	} else {
+		tree.deleteCase4(node)
+	}
+}
+
+func (tree *Tree) deleteCase4(node *Node) {
+	sibling := node.sibling()
+	if nodeColor(node.Parent) == red &&
+		nodeColor(sibling) == black &&
+		nodeColor(sibling.Left) == black &&
+		nodeColor(sibling.Right) == black {
+		sibling.color = red
+		node.Parent.color = black
+	} else {
+		tree.deleteCase5(node)
+	}
+}
+
+func (tree *Tree) deleteCase5(node *Node) {
+	sibling := node.sibling()
+	if node == node.Parent.Left &&
+		nodeColor(sibling) == black &&
+		nodeColor(sibling.Left) == red &&
+		nodeColor(sibling.Right) == black {
+		sibling.color = red
+		sibling.Left.color = black
+		tree.rotateRight(sibling)
+	} else if node == node.Parent.Right &&
+		nodeColor(sibling) == black &&
+		nodeColor(sibling.Right) == red &&
+		nodeColor(sibling.Left) == black {
+		sibling.color = red
+		sibling.Right.color = black
+		tree.rotateLeft(sibling)
+	}
+	tree.deleteCase6(node)
+}
+
+func (tree *Tree) deleteCase6(node *Node) {
+	sibling := node.sibling()
+	sibling.color = nodeColor(node.Parent)
+	node.Parent.color = black
+	if node == node.Parent.Left && nodeColor(sibling.Right) == red {
+		sibling.Right.color = black
+		tree.rotateLeft(node.Parent)
+	} else if nodeColor(sibling.Left) == red {
+		sibling.Left.color = black
+		tree.rotateRight(node.Parent)
+	}
+}
+
+func nodeColor(node *Node) color {
+	if node == nil {
+		return black
+	}
+	return node.color
+}

vendor/github.com/emirpasic/gods/trees/trees.go

@@ -0,0 +1,21 @@
+// Copyright (c) 2015, Emir Pasic. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package trees provides an abstract Tree interface.
+//
+// In computer science, a tree is a widely used abstract data type (ADT) or data structure implementing this ADT that simulates a hierarchical tree structure, with a root value and subtrees of children with a parent node, represented as a set of linked nodes.
+//
+// Reference: https://en.wikipedia.org/wiki/Tree_%28data_structure%29
+package trees
+
+import "github.com/emirpasic/gods/containers"
+
+// Tree interface that all trees implement
+type Tree interface {
+	containers.Container
+	// Empty() bool
+	// Size() int
+	// Clear()
+	// Values() []interface{}
+}