fuelprices/vendor/github.com/antchfx/xmlquery/README.md

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xmlquery
====
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Overview
===
xmlquery is an XPath query package for XML document, lets you extract data or evaluate from XML documents by an XPath expression.
Change Logs
===
**2018-12-23**
* added XML output will including comment node. [#9](https://github.com/antchfx/xmlquery/issues/9)
**2018-12-03**
* added support attribute name with namespace prefix and XML output. [#6](https://github.com/antchfx/xmlquery/issues/6)
Installation
====
> $ go get github.com/antchfx/xmlquery
Getting Started
===
#### Parse a XML from URL.
```go
doc, err := xmlquery.LoadURL("http://www.example.com/sitemap.xml")
```
#### Parse a XML from string.
```go
s := `<?xml version="1.0" encoding="utf-8"?><rss version="2.0"></rss>`
doc, err := xmlquery.Parse(strings.NewReader(s))
```
#### Parse a XML from io.Reader.
```go
f, err := os.Open("../books.xml")
doc, err := xmlquery.Parse(f)
```
#### Find authors of all books in the bookstore.
```go
list := xmlquery.Find(doc, "//book//author")
// or
list := xmlquery.Find(doc, "//author")
```
#### Find the second book.
```go
book := xmlquery.FindOne(doc, "//book[2]")
```
#### Find all book elements and only get `id` attribute self. (New Feature)
```go
list := xmlquery.Find(doc,"//book/@id")
```
#### Find all books with id is bk104.
```go
list := xmlquery.Find(doc, "//book[@id='bk104']")
```
#### Find all books that price less than 5.
```go
list := xmlquery.Find(doc, "//book[price<5]")
```
#### Evaluate the total price of all books.
```go
expr, err := xpath.Compile("sum(//book/price)")
price := expr.Evaluate(xmlquery.CreateXPathNavigator(doc)).(float64)
fmt.Printf("total price: %f\n", price)
```
#### Evaluate the number of all books element.
```go
expr, err := xpath.Compile("count(//book)")
price := expr.Evaluate(xmlquery.CreateXPathNavigator(doc)).(float64)
```
#### Create XML document.
```go
doc := &xmlquery.Node{
Type: xmlquery.DeclarationNode,
Data: "xml",
Attr: []xml.Attr{
xml.Attr{Name: xml.Name{Local: "version"}, Value: "1.0"},
},
}
root := &xmlquery.Node{
Data: "rss",
Type: xmlquery.ElementNode,
}
doc.FirstChild = root
channel := &xmlquery.Node{
Data: "channel",
Type: xmlquery.ElementNode,
}
root.FirstChild = channel
title := &xmlquery.Node{
Data: "title",
Type: xmlquery.ElementNode,
}
title_text := &xmlquery.Node{
Data: "W3Schools Home Page",
Type: xmlquery.TextNode,
}
title.FirstChild = title_text
channel.FirstChild = title
fmt.Println(doc.OutputXML(true))
// <?xml version="1.0"?><rss><channel><title>W3Schools Home Page</title></channel></rss>
```
Quick Tutorial
===
```go
import (
"github.com/antchfx/xmlquery"
)
func main(){
s := `<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
<channel>
<title>W3Schools Home Page</title>
<link>https://www.w3schools.com</link>
<description>Free web building tutorials</description>
<item>
<title>RSS Tutorial</title>
<link>https://www.w3schools.com/xml/xml_rss.asp</link>
<description>New RSS tutorial on W3Schools</description>
</item>
<item>
<title>XML Tutorial</title>
<link>https://www.w3schools.com/xml</link>
<description>New XML tutorial on W3Schools</description>
</item>
</channel>
</rss>`
doc, err := xmlquery.Parse(strings.NewReader(s))
if err != nil {
panic(err)
}
channel := xmlquery.FindOne(doc, "//channel")
if n := channel.SelectElement("title"); n != nil {
fmt.Printf("title: %s\n", n.InnerText())
}
if n := channel.SelectElement("link"); n != nil {
fmt.Printf("link: %s\n", n.InnerText())
}
for i, n := range xmlquery.Find(doc, "//item/title") {
fmt.Printf("#%d %s\n", i, n.InnerText())
}
}
```
List of supported XPath query packages
===
|Name |Description |
|--------------------------|----------------|
|[htmlquery](https://github.com/antchfx/htmlquery) | XPath query package for the HTML document|
|[xmlquery](https://github.com/antchfx/xmlquery) | XPath query package for the XML document|
|[jsonquery](https://github.com/antchfx/jsonquery) | XPath query package for the JSON document|
Questions
===
Please let me know if you have any questions