add simple 'sys' to make using as node library easier

example of such usage in node_example.js

Author: fcheslack

lib/citeprocnode.js

@@ -14,9 +14,51 @@ var fs = require('fs');
 var log = require('npmlog');
 var _ = require('underscore')._;
 var Promise = require('bluebird');
+let jsonWalker = require("./json_walker.js");
 
 //var sampleCites = require('../test/loadcitesnode.js');
 
+exports.simpleSys = function(){
+    this.items = {};
+    this.locales = {};
+};
+
+exports.simpleSys.prototype.retrieveLocale = function(locale){
+    return this.locales[locale];
+};
+
+exports.simpleSys.prototype.retrieveItem = function(itemID){
+    return this.items[itemID];
+};
+
+exports.simpleSys.prototype.addLocale = function(localeCode, localeString){
+    let localeObject;
+    try {
+        localeObject = JSON.parse(localeString);
+    } catch(e) {
+        let localeDoc = jsonWalker.MakeDoc(localeString);
+        localeObject = jsonWalker.JsonWalker.walkLocaleToObj(localeDoc);
+        localeDoc.defaultView.close();
+    }
+    this.locales[localeCode] = localeObject;
+};
+
+exports.simpleSys.prototype.newEngine = function(styleString, locale, forceLang){
+    let sys = this;
+    let styleObject;
+    try {
+        styleObject = JSON.parse(styleString);
+    } catch(e) {
+        let styleDoc = jsonWalker.MakeDoc(styleString);
+        styleObject = jsonWalker.JsonWalker.walkStyleToObj(styleDoc).obj;
+        styleDoc.defaultView.close();
+    }
+    
+    let CSL = require("./citeproc.js").CSL;
+    let cslEngine = new CSL.Engine(sys, styleObject, locale);
+    return cslEngine;
+};
+
 exports.prepareData = function(postObj, citations){
     log.verbose("citeprocnode.prepareData");
     // Get items object for this request from post body

node_example.js

@@ -0,0 +1,30 @@
+var fs = require('fs');
+var citeprocnode = require("./lib/citeprocnode.js");
+
+var sys = new citeprocnode.simpleSys();
+var enUS = fs.readFileSync('./csl-locales/locales-en-US.xml', 'utf8');
+sys.addLocale('en-US', enUS);
+var styleString = fs.readFileSync('./csl/ieee.csl', 'utf8');
+var engine = sys.newEngine(styleString, 'en-US', null);
+
+var items = {"14058/RN9M5BF3":{"accessed":{"month":"9","year":"2010","day":"10"},"id":"14058/RN9M5BF3","author":[{"given":"Adel","family":"Hendaoui"},{"given":"Moez","family":"Limayem"},{"given":"Craig W.","family":"Thompson"}],"title":"3D Social Virtual Worlds: <i>Research Issues and Challenges</i>","type":"article-journal","versionNumber":6816},"14058/NSBERGDK":{"accessed":{"month":"9","year":"2010","day":"10"},"issued":{"month":"6","year":"2009"},"event-place":"Istanbul","type":"paper-conference","DOI":"10.1109/DEST.2009.5276761","page-first":"151","id":"14058/NSBERGDK","title-short":"3D virtual worlds as collaborative communities enriching human endeavours","publisher-place":"Istanbul","author":[{"given":"C.","family":"Dreher"},{"given":"T.","family":"Reiners"},{"given":"N.","family":"Dreher"},{"given":"H.","family":"Dreher"}],"title":"3D virtual worlds as collaborative communities enriching human endeavours: Innovative applications in e-Learning","shortTitle":"3D virtual worlds as collaborative communities enriching human endeavours","page":"151-156","event":"2009 3rd IEEE International Conference on Digital Ecosystems and Technologies (DEST)","URL":"http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5276761","versionNumber":1}};
+
+sys.items = items;
+
+var clusters = [
+    {
+        citationItems: ["14058/RN9M5BF3"],
+        properties: {
+            note:0
+        }
+    },
+    {
+        citationItems: ["14058/NSBERGDK"],
+        properties: {
+            note:0
+        }
+    },
+];
+
+engine.updateItems(Object.keys(items));
+var bib = engine.makeBibliography();