com.eidu.content.learningpackages.util.XmlUtil.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of learning-packages Show documentation

Support for reading EIDU learning packages

The newest version!

package com.eidu.content.learningpackages.util

import org.w3c.dom.Document
import org.w3c.dom.Node
import org.w3c.dom.NodeList
import javax.xml.parsers.DocumentBuilderFactory
import javax.xml.xpath.XPathConstants
import javax.xml.xpath.XPathFactory

private val documentBuilderFactory by lazy { DocumentBuilderFactory.newInstance() }
private val xpath by lazy { XPathFactory.newInstance().newXPath() }

fun parseXml(xml: String): Document =
    xml.byteInputStream().use { documentBuilderFactory.newDocumentBuilder().parse(it) }

fun Document.getStrings(expression: String): Sequence {
    val nodes = xpath.evaluate(expression, this, XPathConstants.NODESET) as NodeList
    return nodes.asSequence().map { it.textContent }
}

fun NodeList.asSequence(): Sequence = sequence {
    for (i in 0 until length)
        yield(item(i))
}