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index.js
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index.js
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require("inflector"); // modifies global string object
var et = require('elementtree');
var ElementTree = et.ElementTree;
var element = et.Element;
var subElement = et.SubElement;
/**
* This function merges two objects. Pretty simple stuff.
*/
function merge(obj1, obj2) {
var obj3 = {};
for (var attr1 in obj1) {
obj3[attr1] = obj1[attr1];
}
for (var attr2 in obj2) {
obj3[attr2] = obj2[attr2];
}
return obj3;
}
/**
* This function pads a number so that it is two digits
*/
function zeroPadTen(val) {
if (val < 10) {
return "0" + val;
}
return val;
}
/**
* This is our main EasyXml object which gets exported as a module
*/
var EasyXml = function() {
var self = this;
/**
* Default configuration object
*/
self.config = {
singularizeChildren: true,
underscoreAttributes: true,
rootElement: 'response',
dateFormat: 'ISO', // ISO = ISO8601, SQL = MySQL Timestamp, JS = (new Date).toString()
manifest: false,
indent: 4
};
/**
* Public
* Merges in the provided config object with the defaults
*/
self.configure = function(config) {
// should be merge, otherwise we lose defaults
self.config = merge(self.config, config);
};
/**
* Public
* Takes an object and returns an XML string
*/
self.render = function(object, rootElementOverride) {
var xml = element(rootElementOverride || self.config.rootElement);
parseChildElement(xml, object);
return new ElementTree(xml).write({
xml_declaration: self.config.manifest,
indent: self.config.indent
});
};
/**
* Recursive, Private
* Takes an object and attaches it to the XML doc
*/
function parseChildElement(parentXmlNode, parentObjectNode) {
for (var key in parentObjectNode) {
if (parentObjectNode.hasOwnProperty(key)) {
var child = parentObjectNode[key];
var el = null;
if (self.config.underscoreAttributes && key.charAt(0) === '_') {
// Attribute
if (typeof child === 'string' || typeof child === 'number') {
parentXmlNode.set(key.substring(1), child);
} else {
throw new Error(key + "contained non_string_attribute");
}
} else if (child === null) {
// Null data, send an empty tag
el = subElement(parentXmlNode, key);
} else if (typeof child === 'object' && child.constructor && child.constructor.name && child.constructor.name === 'Date') {
// Date
el = subElement(parentXmlNode, key);
if (self.config.dateFormat === 'ISO') {
// ISO: YYYY-MM-DDTHH:MM:SS.mmmZ
el.text = child.toISOString();
} else if (self.config.dateFormat === 'SQL') {
// SQL: YYYY-MM-DD HH:MM:SS
var yyyy = child.getFullYear();
var mm = zeroPadTen(child.getMonth() + 1);
var dd = zeroPadTen(child.getDate());
var hh = zeroPadTen(child.getHours());
var min = zeroPadTen(child.getMinutes());
var ss = zeroPadTen(child.getSeconds());
el.text = yyyy + '-' + mm + '-' + dd + ' ' + hh + ':' + min + ':' + ss;
} else if (self.config.dateFormat === 'JS') {
// JavaScript date format
el.text = child.toString();
} else {
throw new Error(key + "contained unknown_date_format");
}
} else if (typeof child === 'object' && child.constructor && child.constructor.name && child.constructor.name === 'Array') {
// Array
el = subElement(parentXmlNode, key);
var subElementName = key.singular();
for (var key2 in child) {
if (child.hasOwnProperty(key2)) {
var el2 = subElement(el, subElementName);
parseChildElement(el2, child[key2]);
}
}
} else if (typeof child === 'object') {
// Object, go deeper
el = subElement(parentXmlNode, key);
parseChildElement(el, child);
} else if (typeof child === 'number') {
// It's a number
el = subElement(parentXmlNode, key);
el.text = child.toString();
} else if (typeof child === 'string') {
// It's a string
el = subElement(parentXmlNode, key);
el.text = child;
} else if (typeof child === 'boolean') {
// It's a true or a false
el = subElement(parentXmlNode, key);
el.text = child.toString();
} else {
throw new Error(key + " contained unknown_data_type: " + typeof child);
}
}
}
}
};
module.exports = new EasyXml();