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xml-writer.js
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Tue, Mar 4, 10:26

xml-writer.js
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'use strict';
/*
Copyright 2012-2015, Yahoo Inc.
Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
*/
const INDENT = ' ';
function attrString(attrs) {
return Object.entries(attrs || {})
.map(([k, v]) => ` ${k}="${v}"`)
.join('');
}
/**
* a utility class to produce well-formed, indented XML
* @param {ContentWriter} contentWriter the content writer that this utility wraps
* @constructor
*/
class XMLWriter {
constructor(contentWriter) {
this.cw = contentWriter;
this.stack = [];
}
indent(str) {
return this.stack.map(() => INDENT).join('') + str;
}
/**
* writes the opening XML tag with the supplied attributes
* @param {String} name tag name
* @param {Object} [attrs=null] attrs attributes for the tag
*/
openTag(name, attrs) {
const str = this.indent(`<${name + attrString(attrs)}>`);
this.cw.println(str);
this.stack.push(name);
}
/**
* closes an open XML tag.
* @param {String} name - tag name to close. This must match the writer's
* notion of the tag that is currently open.
*/
closeTag(name) {
if (this.stack.length === 0) {
throw new Error(`Attempt to close tag ${name} when not opened`);
}
const stashed = this.stack.pop();
const str = `</${name}>`;
if (stashed !== name) {
throw new Error(
`Attempt to close tag ${name} when ${stashed} was the one open`
);
}
this.cw.println(this.indent(str));
}
/**
* writes a tag and its value opening and closing it at the same time
* @param {String} name tag name
* @param {Object} [attrs=null] attrs tag attributes
* @param {String} [content=null] content optional tag content
*/
inlineTag(name, attrs, content) {
let str = '<' + name + attrString(attrs);
if (content) {
str += `>${content}</${name}>`;
} else {
str += '/>';
}
str = this.indent(str);
this.cw.println(str);
}
/**
* closes all open tags and ends the document
*/
closeAll() {
this.stack
.slice()
.reverse()
.forEach(name => {
this.closeTag(name);
});
}
}
module.exports = XMLWriter;

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