xquery

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Version: v0.0.0-...-ad5b8c7 Latest Latest
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Published: May 15, 2018 License: MIT

README

xquery

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NOTE: This package is deprecated. Recommends use htmlquery and xmlquery package, get latest version to fixed some issues.

Overview

Golang package, lets you extract data from HTML/XML documents using XPath expression.

List of supported XPath functions you can found here XPath Package.

Installation

go get github.com/antchfx/xquery

HTML Query GoDoc

Extract data from HTML document.

package main

import (
	"github.com/antchfx/xpath"
	"github.com/antchfx/xquery/html"
)

func main() {
	// Load HTML file.
	f, err := os.Open(`./examples/test.html`)
	if err != nil {
		panic(err)
	}
	// Parse HTML document.
	doc, err := htmlquery.Parse(f)
	if err != nil{
		panic(err)
	}

	// Option 1: using xpath's expr to matches nodes.
	expr := xpath.MustCompile("count(//div[@class='article'])")
	fmt.Printf("%f \n", expr.Evaluate(htmlquery.CreateXPathNavigator(doc)).(float64))

	expr = xpath.MustCompile("//a/@href")
	iter := expr.Evaluate(htmlquery.CreateXPathNavigator(doc)).(*xpath.NodeIterator)
	for iter.MoveNext() {
		fmt.Printf("%s \n", iter.Current().Value()) // output href
	}

	// Option 2: using build-in functions Find() to matches nodes.
	for _, n := range htmlquery.Find(doc, "//a/@href") {
		fmt.Printf("%s \n", htmlquery.SelectAttr(n, "href")) // output href
	}
}

XML Query GoDoc

Extract data from XML document.

package main

import (
	"github.com/antchfx/xpath"
	"github.com/antchfx/xquery/xml"
)

func main() {
	// Load XML document from file.
	f, err := os.Open(`./examples/test.xml`)
	if err != nil {
		panic(err)
	}
	// Parse XML document.
	doc, err := xmlquery.Parse(f)
	if err != nil{
		panic(err)
	}

	// Option 1: using xpath's expr to matches nodes.

	// sum all book's price via Evaluate()
	expr, err := xpath.Compile("sum(//book/price)")
	if err != nil {
		panic(err)
	}
	fmt.Printf("total price: %f\n", expr.Evaluate(xmlquery.CreateXPathNavigator(doc)).(float64))

	for _, n := range xmlquery.Find(doc, "//book") {
		fmt.Printf("%s : %s \n", n.SelectAttr("id"), xmlquery.FindOne(n, "title").InnerText())
	}
	
	// Option 2: using build-in functions FindOne() to matches node.
	n := xmlquery.FindOne(doc, "//book[@id='bk104']")
	fmt.Printf("%s \n", n.OutputXML(true))
}

Directories

Path Synopsis
examples
xml
Package htmlquery provides extract data from HTML documents using XPath expression.
Package htmlquery provides extract data from HTML documents using XPath expression.
Package xmlquery provides extract data from XML documents using XPath expression.
Package xmlquery provides extract data from XML documents using XPath expression.

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