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96 lines
2.5 KiB
96 lines
2.5 KiB
4 years ago
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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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/**
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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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function XMLWriter(contentWriter) {
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this.cw = contentWriter;
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this.stack = [];
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}
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function attrString(attrs) {
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if (!attrs) {
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return '';
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}
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const ret = [];
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Object.keys(attrs).forEach(k => {
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const v = attrs[k];
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ret.push(k + '="' + v + '"');
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});
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return ret.length === 0 ? '' : ' ' + ret.join(' ');
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}
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XMLWriter.prototype.indent = function(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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XMLWriter.prototype.openTag = function(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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XMLWriter.prototype.closeTag = function(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 ' +
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name +
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' when ' +
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stashed +
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' 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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XMLWriter.prototype.inlineTag = function(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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XMLWriter.prototype.closeAll = function() {
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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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module.exports = XMLWriter;
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