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package jsonquery
import (
"fmt"
"github.com/antchfx/xpath"
)
var _ xpath.NodeNavigator = &NodeNavigator{}
// CreateXPathNavigator creates a new xpath.NodeNavigator for the specified html.Node.
func CreateXPathNavigator(top *Node) *NodeNavigator {
return &NodeNavigator{cur: top, root: top}
}
// Find is like QueryAll but will panics if `expr` cannot be parsed.
func Find(top *Node, expr string) []*Node {
nodes, err := QueryAll(top, expr)
if err != nil {
panic(err)
}
return nodes
}
// FindOne is like Query but will panics if `expr` cannot be parsed.
func FindOne(top *Node, expr string) *Node {
node, err := Query(top, expr)
if err != nil {
panic(err)
}
return node
}
// QueryAll searches the Node that matches by the specified XPath expr.
// Return an error if the expression `expr` cannot be parsed.
func QueryAll(top *Node, expr string) ([]*Node, error) {
exp, err := getQuery(expr)
if err != nil {
return nil, err
}
return QuerySelectorAll(top, exp), nil
}
// Query searches the Node that matches by the specified XPath expr,
// and returns first element of matched.
func Query(top *Node, expr string) (*Node, error) {
exp, err := getQuery(expr)
if err != nil {
return nil, err
}
return QuerySelector(top, exp), nil
}
// QuerySelectorAll searches all of the Node that matches the specified XPath selectors.
func QuerySelectorAll(top *Node, selector *xpath.Expr) []*Node {
t := selector.Select(CreateXPathNavigator(top))
var elems []*Node
for t.MoveNext() {
elems = append(elems, (t.Current().(*NodeNavigator)).cur)
}
return elems
}
// QuerySelector returns the first matched XML Node by the specified XPath selector.
func QuerySelector(top *Node, selector *xpath.Expr) *Node {
t := selector.Select(CreateXPathNavigator(top))
if t.MoveNext() {
return (t.Current().(*NodeNavigator)).cur
}
return nil
}
// NodeNavigator is for navigating JSON document.
type NodeNavigator struct {
root, cur *Node
}
func (a *NodeNavigator) Current() *Node {
return a.cur
}
func (a *NodeNavigator) NodeType() xpath.NodeType {
switch a.cur.Type {
case TextNode:
return xpath.TextNode
case DocumentNode:
return xpath.RootNode
case ElementNode:
return xpath.ElementNode
default:
panic(fmt.Sprintf("unknown node type %v", a.cur.Type))
}
}
func (a *NodeNavigator) LocalName() string {
return a.cur.Data
}
func (a *NodeNavigator) Prefix() string {
return ""
}
func (a *NodeNavigator) Value() string {
switch a.cur.Type {
case ElementNode:
return a.cur.InnerText()
case TextNode:
return a.cur.Data
}
return ""
}
func (a *NodeNavigator) Copy() xpath.NodeNavigator {
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 xpath.NodeNavigator) bool {
node, ok := other.(*NodeNavigator)
if !ok || node.root != a.root {
return false
}
a.cur = node.cur
return true
}
|
