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package json
import (
base "src.userspace.com.au/felix/query"
)
// NodeNavigator implements the Nav interface for navigating JSON nodes.
type NodeNavigator struct {
root, cur *Node
}
func (a *NodeNavigator) Current() *Node {
return a.cur
}
func (a *NodeNavigator) NodeType() base.NodeType {
return a.cur.nodeType
}
func (a *NodeNavigator) LocalName() string {
return a.cur.data
}
func (a *NodeNavigator) Prefix() string {
return ""
}
func (a *NodeNavigator) Value() string {
switch a.cur.nodeType {
case base.ElementNode:
return a.cur.data
case base.TextNode:
return a.cur.data
}
return ""
}
func (a *NodeNavigator) Copy() base.Nav {
n := *a
return &n
}
func (a *NodeNavigator) MoveToRoot() {
a.cur = a.root
}
func (a *NodeNavigator) MoveToParent() bool {
if n := a.cur.parent; n != nil {
a.cur = n
return true
}
return false
}
func (x *NodeNavigator) MoveToNextAttribute() bool {
return false
}
func (a *NodeNavigator) MoveToChild() bool {
if n := a.cur.firstChild; n != nil {
a.cur = n
return true
}
return false
}
func (a *NodeNavigator) MoveToFirst() bool {
for n := a.cur.prevSibling; n != nil; n = n.prevSibling {
a.cur = n
}
return true
}
func (a *NodeNavigator) String() string {
return a.Value()
}
func (a *NodeNavigator) MoveToNext() bool {
if n := a.cur.nextSibling; n != nil {
a.cur = n
return true
}
return false
}
func (a *NodeNavigator) MoveToPrevious() bool {
if n := a.cur.prevSibling; n != nil {
a.cur = n
return true
}
return false
}
func (a *NodeNavigator) MoveTo(other base.Nav) bool {
node, ok := other.(*NodeNavigator)
if !ok || node.root != a.root {
return false
}
a.cur = node.cur
return true
}
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