49 lines
1.7 KiB
Kotlin
49 lines
1.7 KiB
Kotlin
package starter
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import org.w3c.dom.Document
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import org.w3c.dom.NodeList
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import org.xml.sax.InputSource
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import java.io.ByteArrayInputStream
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import java.io.StringWriter
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import javax.xml.parsers.DocumentBuilderFactory
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import javax.xml.transform.OutputKeys
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import javax.xml.transform.TransformerFactory
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import javax.xml.transform.dom.DOMSource
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import javax.xml.transform.stream.StreamResult
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import javax.xml.xpath.XPathConstants
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import javax.xml.xpath.XPathFactory
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/*
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@see https://stackoverflow.com/a/33541820
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*/
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fun prettyPrintXml(xml: String, indent: Int = 4): String {
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// Turn xml string into a document
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val document: Document = DocumentBuilderFactory.newInstance()
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.newDocumentBuilder()
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.parse(InputSource(ByteArrayInputStream(xml.encodeToByteArray())))
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// Remove whitespaces outside tags
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document.normalize()
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val xPath = XPathFactory.newInstance().newXPath()
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val nodeList = xPath.evaluate("//text()[normalize-space()='']",
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document,
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XPathConstants.NODESET) as NodeList
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for (i in 0 until nodeList.length) {
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val node = nodeList.item(i)
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node.parentNode.removeChild(node)
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}
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// Setup pretty print options
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val transformerFactory = TransformerFactory.newInstance()
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transformerFactory.setAttribute("indent-number", indent)
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val transformer = transformerFactory.newTransformer()
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transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8")
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transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes")
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transformer.setOutputProperty(OutputKeys.INDENT, "yes")
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// Return pretty print xml string
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val stringWriter = StringWriter()
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transformer.transform(DOMSource(document), StreamResult(stringWriter))
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return stringWriter.toString()
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} |