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Copy pathxml.go
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Copy pathxml.go
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214 lines (168 loc) · 3.53 KB
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package parser
import (
"encoding/xml"
"io"
"github.com/ChrisTrenkamp/xsel/node"
"golang.org/x/net/html/charset"
)
const xmlns = "xmlns"
type XmlElement struct {
space, local string
}
func (x XmlElement) Space() string {
return x.space
}
func (x XmlElement) Local() string {
return x.local
}
type XmlNamespace struct {
prefix, value string
}
func (x XmlNamespace) Prefix() string {
return x.prefix
}
func (x XmlNamespace) NamespaceValue() string {
return x.value
}
type XmlAttribute struct {
space, local, value string
}
func (x XmlAttribute) Space() string {
return x.space
}
func (x XmlAttribute) Local() string {
return x.local
}
func (x XmlAttribute) AttributeValue() string {
return x.value
}
type XmlCharData struct {
value string
}
func (x XmlCharData) CharDataValue() string {
return x.value
}
type XmlComment struct {
value string
}
func (x XmlComment) CommentValue() string {
return x.value
}
type XmlProcInst struct {
target, value string
}
func (x XmlProcInst) Target() string {
return x.target
}
func (x XmlProcInst) ProcInstValue() string {
return x.value
}
var emptyXmlAttrs = make([]XmlAttribute, 0)
var emptyXmlNamespaces = make([]XmlNamespace, 0)
type xmlParser struct {
xmlReader *xml.Decoder
namespaces []XmlNamespace
nsPos int
attrs []XmlAttribute
attrPos int
}
func (x *xmlParser) Pull() (node.Node, bool, error) {
if x.nsPos < len(x.namespaces) {
n := x.namespaces[x.nsPos]
x.nsPos++
return n, false, nil
}
if x.attrPos < len(x.attrs) {
a := x.attrs[x.attrPos]
x.attrPos++
return a, false, nil
}
x.attrs = emptyXmlAttrs
x.attrPos = 0
x.namespaces = emptyXmlNamespaces
x.nsPos = 0
tok, err := x.xmlReader.Token()
if err != nil {
return nil, false, err
}
switch n := tok.(type) {
case xml.StartElement:
x.namespaces = createXmlNamespaces(n.Attr)
x.attrs = createXmlAttrs(n.Attr)
return XmlElement{
space: n.Name.Space,
local: n.Name.Local,
}, false, nil
case xml.CharData:
return XmlCharData{
value: (string)(n),
}, false, nil
case xml.Comment:
return XmlComment{
value: (string)(n),
}, false, nil
case xml.ProcInst:
return XmlProcInst{
target: n.Target,
value: string(n.Inst),
}, false, nil
}
//case xml.EndElement:
return nil, true, nil
}
func createXmlNamespaces(attrs []xml.Attr) []XmlNamespace {
ret := make([]XmlNamespace, 0, 1)
ns := XmlNamespace{
prefix: "xml",
value: "http://www.w3.org/XML/1998/namespace",
}
ret = append(ret, ns)
for _, i := range attrs {
if i.Name.Space == "" && i.Name.Local == xmlns {
ns = XmlNamespace{
prefix: "",
value: i.Value,
}
ret = append(ret, ns)
}
if i.Name.Local == xmlns {
ns = XmlNamespace{
prefix: i.Name.Space,
value: i.Value,
}
ret = append(ret, ns)
}
}
return ret
}
func createXmlAttrs(attrs []xml.Attr) []XmlAttribute {
ret := make([]XmlAttribute, 0, len(attrs))
for _, i := range attrs {
if i.Name.Space == xmlns || i.Name.Local == xmlns {
continue
}
next := XmlAttribute{
space: i.Name.Space,
local: i.Name.Local,
value: i.Value,
}
ret = append(ret, next)
}
return ret
}
type XmlParseOptions func(d *xml.Decoder)
// Creates a Parser that reads the given XML document.
func ReadXml(in io.Reader, opts ...XmlParseOptions) Parser {
xmlReader := xml.NewDecoder(in)
xmlReader.CharsetReader = charset.NewReaderLabel
for _, i := range opts {
i(xmlReader)
}
return &xmlParser{
xmlReader: xmlReader,
namespaces: emptyXmlNamespaces,
nsPos: 0,
attrs: emptyXmlAttrs,
attrPos: 0,
}
}