xml stream parser

xml-stream-parser is xml parser for GO. It is efficient to parse large xml data with streaming fashion.

Usage

<?xml version="1.0" encoding="UTF-8"?>
<bookstorenumber="2"loc="273456">
<book>
<title>The Iliad and The Odyssey</title>
<price>12.95</price>
<comments>
<userCommentrating="4">Best translation I've read.</userComment>
<userCommentrating="2">I like other versions better.</userComment>
</comments>
</book>
<book>
<title>Anthology of World Literature</title>
<price>24.95</price>
<comments>
<userCommentrating="3">Needs more modern literature.</userComment>
<userCommentrating="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")
forxml:=rangeparser.Stream() {
fmt.Println(xml.Childs["title"][0].InnerText)
ifxml.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

forxml:=rangeparser.Stream() {
ifxml.Err!=nil {
// handle error
}
}

Progress of parsing

// total byte read to calculate the progress of parsingparser.TotalReadSize

Xpath query provides alternative to default fast access for different usecases

parser:=xmlparser.NewXMLParser(bufreader, "bookstore").EnableXpath()
forxml:=rangep.Stream() {
// select books xml.SelectElements("//book")
xml.SelectElements("./book")
xml.SelectElements("book")
// select titlesxml.SelectElements("./book/title")
// select book with price condition
xml.SelectElements("//book[price>=20.95]"))
//comments with rating 4xml.SelectElements("//book/comments/userComment[@rating='4']")
}
// for evaluate function or reuse existing xpath expression// sum of all the book priceexpr, 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