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