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* xml-beautify - pretty-print text in XML formats.
*
* Copyright (c) 2018 Tom Misawa, riversun.org@gmail.com
*
* MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
* Usage:
*
* const resultXmlText = new XmlBeautify().beautify(textInput.value,
* {
* indent: ' ', //indent pattern like white spaces
* useSelfClosingElement: true //true:use self-closing element when empty element.
* });
*
* How "useSelfClosingElement" property works.
*
* useSelfClosingElement:true
* <foo></foo> ==> <foo/>
*
* useSelfClosingElement:false
* <foo></foo> ==> <foo></foo>
*
*/
const ELEMENT_NODE = 1;
const ATTRIBUTE_NODE = 2;
const TEXT_NODE = 3;
const CDATA_SECTION_NODE = 4;
const PROCESSING_INSTRUCTION_NODE = 7;
const COMMENT_NODE = 8;
const DOCUMENT_NODE = 9;
const DOCUMENT_TYPE_NODE = 10;
const DOCUMENT_FRAGMENT_NODE = 11;
export default class XmlBeautify {
constructor(option) {
const opt = option || {};
this.userExternalParser = false;
if (opt.parser) {
this.userExternalParser = true;
this.parser = new opt.parser();
} else {
this.parser = new DOMParser();
}
}
hasXmlDef(xmlText) {
return xmlText.indexOf('<?xml') >= 0;
}
getEncoding(xmlText) {
const me = this;
Iif (!me.hasXmlDef(xmlText)) {
return null;
}
const encodingStartPos = xmlText.toLowerCase().indexOf('encoding="') + 'encoding="'.length;
const encodingEndPos = xmlText.indexOf('"?>');
const encoding = xmlText.substr(encodingStartPos, encodingEndPos - encodingStartPos);
return encoding;
}
/**
* Returns Array of ELEMENT_NODE-child
* @param element
* @returns {*[]}
* @private
*/
_children(element) {
const _ret = [];
const numOfChildNodes = element.childNodes.length;
for (let i = 0; i < numOfChildNodes; i++) {
if (element.childNodes[i].nodeType === ELEMENT_NODE) {
_ret.push(element.childNodes[i]);
}
}
return _ret;
}
beautify(xmlText, data) {
const me = this;
const doc = me.parser.parseFromString(xmlText, 'text/xml');
let indent = ' ';
const encoding = 'UTF-8';
let useSelfClosingElement = false;
if (data) {
if (data.indent) {
indent = data.indent;
}
if (data.useSelfClosingElement == true) {
useSelfClosingElement = data.useSelfClosingElement;
}
}
let xmlHeader = null;
Eif (me.hasXmlDef(xmlText)) {
const encoding = me.getEncoding(xmlText);
xmlHeader = '<?xml version="1.0" encoding="' + encoding + '"?>';
}
const buildInfo = {
indentText: indent,
xmlText: '',
useSelfClosingElement: useSelfClosingElement,
indentLevel: 0
}
if (me.userExternalParser) {
me._parseInternally(this._children(doc)[0], buildInfo);
} else {
me._parseInternally(doc.children[0], buildInfo);
}
let resultXml = '';
Eif (xmlHeader) {
resultXml += xmlHeader + '\n';
}
resultXml += buildInfo.xmlText;
return resultXml;
};
_parseInternally(element, buildInfo) {
const me = this;
let elementTextContent = element.textContent;
const blankReplacedElementContent = elementTextContent.replace(/ /g, '').replace(/\r?\n/g, '').replace(/\n/g, '').replace(/\t/g, '');
if (blankReplacedElementContent.length == 0) {
elementTextContent = '';
}
let elementHasNoChildren;
if (me.userExternalParser) {
elementHasNoChildren = !(me._children(element).length > 0);
} else {
elementHasNoChildren = !(element.children.length > 0);
}
const elementHasValueOrChildren = (elementTextContent && elementTextContent.length > 0);
const elementHasItsValue = elementHasNoChildren && elementHasValueOrChildren;
const isEmptyElement = elementHasNoChildren && !elementHasValueOrChildren;
const useSelfClosingElement = buildInfo.useSelfClosingElement;
const startTagPrefix = '<';
const startTagSuffix = '>';
const startTagSuffixEmpty = ' />';
const endTagPrefix = '</';
const endTagSuffix = '>';
let valueOfElement = '';
if (elementHasItsValue) {
const { hasCDATAChild, content } = me._getFirstCDATAChild(element);
if (hasCDATAChild) {
valueOfElement += content;
} else {
valueOfElement += elementTextContent;
}
}
let indentText = '';
for (let idx = 0; idx < buildInfo.indentLevel; idx++) {
indentText += buildInfo.indentText;
}
buildInfo.xmlText += indentText;
buildInfo.xmlText += startTagPrefix + element.tagName
//add attributes
for (let i = 0; i < element.attributes.length; i++) {
const attr = element.attributes[i];
buildInfo.xmlText += ' ' + attr.name + '=' + '"' + attr.textContent + '"';
}
if (isEmptyElement && useSelfClosingElement) {
buildInfo.xmlText += startTagSuffixEmpty;
} else {
buildInfo.xmlText += startTagSuffix;
}
if (elementHasItsValue) {
buildInfo.xmlText += valueOfElement;
} else {
if (isEmptyElement && !useSelfClosingElement) {
} else {
buildInfo.xmlText += '\n';
}
}
buildInfo.indentLevel++;
let lengOfChildren;
if (me.userExternalParser) {
lengOfChildren = me._children(element).length;
} else {
lengOfChildren = element.children.length;
}
for (let i = 0; i < lengOfChildren; i++) {
let child;
if (me.userExternalParser) {
child = me._children(element)[i];
} else {
child = element.children[i];
}
me._parseInternally(child, buildInfo);
}
buildInfo.indentLevel--;
if (isEmptyElement) {
if (useSelfClosingElement) {
} else {
const endTag = endTagPrefix + element.tagName + endTagSuffix;
buildInfo.xmlText += endTag;
buildInfo.xmlText += '\n';
}
} else {
const endTag = endTagPrefix + element.tagName + endTagSuffix;
if (!(elementHasNoChildren && elementHasValueOrChildren)) {
buildInfo.xmlText += indentText;
}
buildInfo.xmlText += endTag;
buildInfo.xmlText += '\n';
}
};
/**
* Return the CDATA section in the first child element of element.
* If not exists, returns { hasCDATAChild:false }
* @param element
* @returns {*}
* @private
*/
_getFirstCDATAChild(element) {
const numOfChildNodes = element.childNodes.length;// numOfChildNodes should be 1
let textContent = ``;
let hasCDATA = false;
for (let i = 0; i < numOfChildNodes; i++) {
if (element.childNodes[i].nodeType === TEXT_NODE) {
const data = element.childNodes[i].data;
const blankReplacedElementContent = data.replace(/ /g, '').replace(/\r?\n/g, '').replace(/\n/g, '').replace(/\t/g, '');
if (blankReplacedElementContent.length > 0) {
textContent += element.childNodes[i].data;
}
} else Eif (element.childNodes[i].nodeType === CDATA_SECTION_NODE) {
const data = element.childNodes[i].data;
textContent += '<![CDATA[';
textContent += data;
textContent += ']]>';
hasCDATA = true;
}
}
if (hasCDATA) {
return { hasCDATAChild: true, content: textContent };
}
return { hasCDATAChild: false };
}
}
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