xml-stream-parser is xml parser for GO. It is efficient to parse large xml data with streaming fashion.
<?xml version="1.0" encoding="UTF-8"?>
<bookstore number="2" loc="273456">
<book>
<title>The Iliad and The Odyssey</title>
<price>12.95</price>
<comments>
<userComment rating="4">Best translation I've read.</userComment>
<userComment rating="2">I like other versions better.</userComment>
</comments>
</book>
<book>
<title>Anthology of World Literature</title>
<price>24.95</price>
<comments>
<userComment rating="3">Needs more modern literature.</userComment>
<userComment rating="4">Excellent overview of world literature.</userComment>
</comments>
</book>
<journal>
<title>Journal of XML parsing</title>
<issue>1</issue>
</journal>
</bookstore>Stream over books and journals
f, _ := os.Open("input.xml")
br := bufio.NewReaderSize(f,65536)
parser := xmlparser.NewXMLParser(br, "book", "journal")
for xml := range parser.Stream() {
fmt.Println(xml.Childs["title"][0].InnerText)
if xml.Name == "book" {
fmt.Println(xml.Childs["comments"][0].Childs["userComment"][0].Attrs["rating"])
fmt.Println(xml.Childs["comments"][0].Childs["userComment"][0].InnerText)
}
}Skip tags for speed
parser := xmlparser.NewXMLParser(br, "book").SkipElements([]string{"price", "comments"})Attributes only
parser := xmlparser.NewXMLParser(br, "bookstore", "book").ParseAttributesOnly("bookstore")Error handlings
for xml := range parser.Stream() {
if xml.Err !=nil {
// handle error
}
}Progress of parsing
// total byte read to calculate the progress of parsing
parser.TotalReadSizeXpath query provides alternative to default fast access for different usecases
parser := xmlparser.NewXMLParser(bufreader, "bookstore").EnableXpath()
for xml := range p.Stream() {
// select books
xml.SelectElements("//book")
xml.SelectElements("./book")
xml.SelectElements("book")
// select titles
xml.SelectElements("./book/title")
// select book with price condition
xml.SelectElements("//book[price>=20.95]"))
//comments with rating 4
xml.SelectElements("//book/comments/userComment[@rating='4']")
}
// for evaluate function or reuse existing xpath expression
// sum of all the book price
expr, err := p.CompileXpath("sum(//book/price)")
price := expr.Evaluate(p.CreateXPathNavigator(xml)).(float64)xpath functionality implemented via xpath library check more examples in its documentation
If you interested check also json parser which works similarly
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