removes CssInitialization and JsInitialization and merges/simplifies code

src/Umbraco.Infrastructure/WebAssets/BackOfficeJavaScriptInitializer.cs

@@ -0,0 +1,74 @@
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+using Umbraco.Core.Configuration;
+using Umbraco.Core.IO;
+
+namespace Umbraco.Web.WebAssets
+{
+    /// <summary>
+    /// Creates a JavaScript block to initialize the back office
+    /// </summary>
+    public class BackOfficeJavaScriptInitializer
+    {
+        // deal with javascript functions inside of json (not a supported json syntax)
+        private const string PrefixJavaScriptObject = "@@@@";
+        private static readonly Regex JsFunctionParser = new Regex($"(\"{PrefixJavaScriptObject}(.*?)\")+",
+            RegexOptions.Multiline | RegexOptions.CultureInvariant | RegexOptions.Compiled);
+
+        // replace tokens in the js main
+        private static readonly Regex Token = new Regex("(\"##\\w+?##\")", RegexOptions.Compiled);
+
+
+        /// <summary>
+        /// Gets the JS initialization script to boot the back office application
+        /// </summary>
+        /// <param name="scripts"></param>
+        /// <param name="angularModule">
+        /// The angular module name to boot
+        /// </param>
+        /// <param name="globalSettings"></param>
+        /// <param name="ioHelper"></param>
+        /// <returns></returns>
+        public static string GetJavascriptInitialization(IEnumerable<string> scripts, string angularModule, IGlobalSettings globalSettings, IIOHelper ioHelper)
+        {
+            var jarray = new StringBuilder();
+            jarray.AppendLine("[");
+            var first = true;
+            foreach (var file in scripts)
+            {
+                if (first) first = false;
+                else jarray.AppendLine(",");
+                jarray.Append("\"");
+                jarray.Append(file);
+                jarray.Append("\"");
+
+            }
+            jarray.Append("]");
+
+            return WriteScript(jarray.ToString(), ioHelper.ResolveUrl(globalSettings.UmbracoPath), angularModule);
+        }
+
+        /// <summary>
+        /// Parses the JsResources.Main and replaces the replacement tokens accordingly
+        /// </summary>
+        /// <param name="scripts"></param>
+        /// <param name="umbracoPath"></param>
+        /// <param name="angularModule"></param>
+        /// <returns></returns>
+        internal static string WriteScript(string scripts, string umbracoPath, string angularModule)
+        {
+            var count = 0;
+            var replacements = new[] { scripts, umbracoPath, angularModule };
+            // replace, catering for the special syntax when we have
+            // js function() objects contained in the json
+
+            return Token.Replace(Resources.Main, match =>
+            {
+                var replacement = replacements[count++];
+                return JsFunctionParser.Replace(replacement, "$2");
+            });
+        }
+
+    }
+}