371 lines
8.3 KiB
Go
371 lines
8.3 KiB
Go
// This work is subject to the CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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// license. Its contents can be found at:
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// http://creativecommons.org/publicdomain/zero/1.0/
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package xmlx
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import (
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"bytes"
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"encoding/xml"
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"fmt"
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"strconv"
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)
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const (
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NT_ROOT = iota
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NT_DIRECTIVE
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NT_PROCINST
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NT_COMMENT
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NT_ELEMENT
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)
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type Attr struct {
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Name xml.Name // Attribute namespace and name.
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Value string // Attribute value.
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}
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type Node struct {
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Type byte // Node type.
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Name xml.Name // Node namespace and name.
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Children []*Node // Child nodes.
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Attributes []*Attr // Node attributes.
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Parent *Node // Parent node.
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Value string // Node value.
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Target string // procinst field.
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}
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func NewNode(tid byte) *Node {
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n := new(Node)
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n.Type = tid
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n.Children = make([]*Node, 0, 10)
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n.Attributes = make([]*Attr, 0, 10)
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return n
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}
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// This wraps the standard xml.Unmarshal function and supplies this particular
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// node as the content to be unmarshalled.
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func (this *Node) Unmarshal(obj interface{}) error {
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return xml.Unmarshal(bytes.NewBuffer(this.Bytes()), obj)
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}
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// Get node value as string
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func (this *Node) S(namespace, name string) string {
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if node := rec_SelectNode(this, namespace, name); node != nil {
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return node.Value
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}
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return ""
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}
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// Get node value as int
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func (this *Node) I(namespace, name string) int {
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if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
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n, _ := strconv.Atoi(node.Value)
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return n
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}
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return 0
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}
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// Get node value as int64
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func (this *Node) I64(namespace, name string) int64 {
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if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
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n, _ := strconv.Atoi64(node.Value)
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return n
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}
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return 0
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}
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// Get node value as uint
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func (this *Node) U(namespace, name string) uint {
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if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
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n, _ := strconv.Atoui(node.Value)
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return n
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}
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return 0
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}
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// Get node value as uint64
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func (this *Node) U64(namespace, name string) uint64 {
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if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
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n, _ := strconv.Atoui64(node.Value)
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return n
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}
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return 0
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}
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// Get node value as float32
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func (this *Node) F32(namespace, name string) float32 {
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if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
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n, _ := strconv.Atof32(node.Value)
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return n
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}
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return 0
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}
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// Get node value as float64
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func (this *Node) F64(namespace, name string) float64 {
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if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
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n, _ := strconv.Atof64(node.Value)
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return n
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}
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return 0
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}
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// Get node value as bool
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func (this *Node) B(namespace, name string) bool {
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if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
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n, _ := strconv.Atob(node.Value)
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return n
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}
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return false
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}
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// Get attribute value as string
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func (this *Node) As(namespace, name string) string {
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for _, v := range this.Attributes {
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if (namespace == "*" || namespace == v.Name.Space) && name == v.Name.Local {
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return v.Value
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}
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}
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return ""
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}
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// Get attribute value as int
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func (this *Node) Ai(namespace, name string) int {
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if s := this.As(namespace, name); s != "" {
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n, _ := strconv.Atoi(s)
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return n
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}
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return 0
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}
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// Get attribute value as uint
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func (this *Node) Au(namespace, name string) uint {
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if s := this.As(namespace, name); s != "" {
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n, _ := strconv.Atoui(s)
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return n
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}
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return 0
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}
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// Get attribute value as uint64
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func (this *Node) Au64(namespace, name string) uint64 {
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if s := this.As(namespace, name); s != "" {
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n, _ := strconv.Atoui64(s)
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return n
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}
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return 0
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}
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// Get attribute value as int64
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func (this *Node) Ai64(namespace, name string) int64 {
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if s := this.As(namespace, name); s != "" {
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n, _ := strconv.Atoi64(s)
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return n
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}
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return 0
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}
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// Get attribute value as float32
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func (this *Node) Af32(namespace, name string) float32 {
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if s := this.As(namespace, name); s != "" {
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n, _ := strconv.Atof32(s)
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return n
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}
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return 0
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}
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// Get attribute value as float64
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func (this *Node) Af64(namespace, name string) float64 {
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if s := this.As(namespace, name); s != "" {
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n, _ := strconv.Atof64(s)
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return n
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}
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return 0
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}
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// Get attribute value as bool
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func (this *Node) Ab(namespace, name string) bool {
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if s := this.As(namespace, name); s != "" {
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n, _ := strconv.Atob(s)
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return n
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}
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return false
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}
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// Returns true if this node has the specified attribute. False otherwise.
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func (this *Node) HasAttr(namespace, name string) bool {
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for _, v := range this.Attributes {
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if namespace != "*" && namespace != v.Name.Space {
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continue
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}
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if name == "*" || name == v.Name.Local {
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return true
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}
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}
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return false
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}
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// Select single node by name
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func (this *Node) SelectNode(namespace, name string) *Node {
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return rec_SelectNode(this, namespace, name)
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}
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func rec_SelectNode(cn *Node, namespace, name string) *Node {
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if (namespace == "*" || cn.Name.Space == namespace) && (name == "*" || cn.Name.Local == name) {
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return cn
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}
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var tn *Node
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for _, v := range cn.Children {
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if tn = rec_SelectNode(v, namespace, name); tn != nil {
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return tn
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}
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}
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return nil
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}
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// Select multiple nodes by name
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func (this *Node) SelectNodes(namespace, name string) []*Node {
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list := make([]*Node, 0, 16)
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rec_SelectNodes(this, namespace, name, &list)
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return list
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}
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func rec_SelectNodes(cn *Node, namespace, name string, list *[]*Node) {
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if (namespace == "*" || cn.Name.Space == namespace) && (name == "*" || cn.Name.Local == name) {
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*list = append(*list, cn)
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return
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}
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for _, v := range cn.Children {
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rec_SelectNodes(v, namespace, name, list)
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}
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}
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// Convert node to appropriate []byte representation based on it's @Type.
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// Note that NT_ROOT is a special-case empty node used as the root for a
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// Document. This one has no representation by itself. It merely forwards the
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// String() call to it's child nodes.
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func (this *Node) Bytes() (b []byte) {
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switch this.Type {
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case NT_PROCINST:
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b = this.printProcInst()
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case NT_COMMENT:
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b = this.printComment()
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case NT_DIRECTIVE:
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b = this.printDirective()
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case NT_ELEMENT:
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b = this.printElement()
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case NT_ROOT:
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b = this.printRoot()
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}
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return
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}
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// Convert node to appropriate string representation based on it's @Type.
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// Note that NT_ROOT is a special-case empty node used as the root for a
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// Document. This one has no representation by itself. It merely forwards the
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// String() call to it's child nodes.
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func (this *Node) String() (s string) {
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return string(this.Bytes())
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}
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func (this *Node) printRoot() []byte {
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var b bytes.Buffer
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for _, v := range this.Children {
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b.Write(v.Bytes())
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}
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return b.Bytes()
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}
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func (this *Node) printProcInst() []byte {
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return []byte("<?" + this.Target + " " + this.Value + "?>")
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}
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func (this *Node) printComment() []byte {
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return []byte("<!-- " + this.Value + " -->")
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}
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func (this *Node) printDirective() []byte {
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return []byte("<!" + this.Value + "!>")
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}
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func (this *Node) printElement() []byte {
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var b bytes.Buffer
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if len(this.Name.Space) > 0 {
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b.WriteRune('<')
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b.WriteString(this.Name.Space)
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b.WriteRune(':')
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b.WriteString(this.Name.Local)
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} else {
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b.WriteRune('<')
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b.WriteString(this.Name.Local)
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}
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for _, v := range this.Attributes {
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if len(v.Name.Space) > 0 {
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b.WriteString(fmt.Sprintf(` %s:%s="%s"`, v.Name.Space, v.Name.Local, v.Value))
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} else {
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b.WriteString(fmt.Sprintf(` %s="%s"`, v.Name.Local, v.Value))
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}
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}
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if len(this.Children) == 0 && len(this.Value) == 0 {
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b.WriteString(" />")
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return b.Bytes()
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}
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b.WriteRune('>')
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for _, v := range this.Children {
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b.Write(v.Bytes())
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}
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b.WriteString(this.Value)
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if len(this.Name.Space) > 0 {
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b.WriteString("</")
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b.WriteString(this.Name.Space)
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b.WriteRune(':')
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b.WriteString(this.Name.Local)
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b.WriteRune('>')
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} else {
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b.WriteString("</")
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b.WriteString(this.Name.Local)
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b.WriteRune('>')
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}
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return b.Bytes()
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}
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// Add a child node
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func (this *Node) AddChild(t *Node) {
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if t.Parent != nil {
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t.Parent.RemoveChild(t)
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}
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t.Parent = this
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this.Children = append(this.Children, t)
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}
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// Remove a child node
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func (this *Node) RemoveChild(t *Node) {
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p := -1
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for i, v := range this.Children {
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if v == t {
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p = i
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break
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}
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}
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if p == -1 {
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return
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}
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copy(this.Children[p:], this.Children[p+1:])
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this.Children = this.Children[0 : len(this.Children)-1]
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t.Parent = nil
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}
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