fix: register elements from embedded templates (#56)

Make the tns-xml-loader parse Angular templates from TypeScript files.

fixes #55

Author: sis0k0

Diff for: tns-xml-loader.js

@@ -20,25 +20,59 @@ if (!global[ELEMENT_REGISTRY]) {
     };
 }
 
-module.exports = function (source, map) {
+function parseResource(source, map) {
     this.cacheable();
 
-    var loader = this;
+    let templateSource;
+    try {
+        templateSource = getTemplateSource(this.resourcePath, source);
+    } catch(e) {
+        this.emitWarning(e.message);
+        return this.callback(null, source, map);
+    }
+
+    if (templateSource === "") {
+        return this.callback(null, source, map);
+    }
 
     var parser = new htmlparser.Parser({
         onopentag: function (name, attribs) {
             // kebab-case to CamelCase
             var elementName = name.split("-").map(function (s) { return s[0].toUpperCase() + s.substring(1); }).join("");
+
             // Module path from element name
             var modulePath = MODULES[elementName] || UI_PATH +
                 (elementName.toLowerCase().indexOf("layout") !== -1 ? "layouts/" : "") +
                 elementName.split(/(?=[A-Z])/).join("-").toLowerCase();
+
             // Update ELEMENT_REGISTRY
             global[ELEMENT_REGISTRY][modulePath] = elementName;
         }
     }, { decodeEntities: true, lowerCaseTags: false });
-    parser.write(source);
+
+    parser.write(templateSource);
     parser.end();
 
-    this.callback(null, source, map);
-};
+    return this.callback(null, source, map);
+}
+
+function getTemplateSource(path, source) {
+    if (isTemplate(path)) {
+        return source;
+    } else if (isComponent(path)) {
+        const templateMatcher = /template\s*:\s*([`'"])((.|\n)*?)\1/;
+        return templateMatcher.test(source) ? source.replace(templateMatcher, "$2") : "";
+    } else {
+        throw new Error(`The NativeScript XML loader must be used with HTML, XML or TypeScript files`);
+    }
+}
+
+function isComponent(resource) {
+    return /\.ts$/i.test(resource);
+}
+
+function isTemplate(resource) {
+    return /\.html$|\.xml$/i.test(resource);
+}
+
+module.exports = parseResource;

Diff for: webpack.common.js.angular.template

@@ -47,7 +47,7 @@ module.exports = function (platform, destinationApp) {
         ]),
 
         // Exclude explicitly required but never declared in XML elements. 
-        // Loader nativescript-dev-webpack/tns-xml-loader should be added for *.xml/html files.
+        // Loader nativescript-dev-webpack/tns-xml-loader should be added for *.xml/html and *.ts files.
         new nsWebpack.ExcludeUnusedElementsPlugin(),
 
         //Angular AOT compiler
@@ -109,7 +109,7 @@ module.exports = function (platform, destinationApp) {
                     test: /\.html$|\.xml$/,
                     loaders: [
                         "raw-loader",
-                        'nativescript-dev-webpack/tns-xml-loader'
+                        "nativescript-dev-webpack/tns-xml-loader",
                     ]
                 },
                 // Root app.css file gets extracted with bundled dependencies
@@ -133,6 +133,7 @@ module.exports = function (platform, destinationApp) {
                 {
                     test: /\.ts$/,
                     loaders: [
+                        "nativescript-dev-webpack/tns-xml-loader",
                         "nativescript-dev-webpack/tns-aot-loader",
                         "@ngtools/webpack",
                     ]