Implement CSS loader that parses the CSS to JSON, Implement platform suffix file resolver plugin

Author: PanayotCankov

Diff for: PlatformSuffixPlugin.js

@@ -0,0 +1,37 @@
+const parseFile = require("path").parse;
+
+function PlatformSuffixPlugin(platform, platforms) {
+    this.platform = platform;
+    this.platforms = platforms || ["ios", "android"];
+}
+module.exports = PlatformSuffixPlugin;
+
+PlatformSuffixPlugin.prototype.apply = function(resolver) {
+    var platform = this.platform;
+    var platforms = this.platforms;
+
+    resolver.plugin("file", function(request, callback) {
+        const fs = this.fileSystem;
+        const file = this.join(request.path, request.request);
+        const query = request.query;
+        const pFile = parseFile(file);
+        const platformFile = this.join(pFile.dir, pFile.name + ("." + platform) + pFile.ext);
+        fs.stat(platformFile, (err, stat) => {
+            if (!err && stat && stat.isFile()) {
+                const err = undefined;
+                const path = platformFile;
+                callback(err, { file: true, path, query });
+            } else {
+                fs.stat(file, (err, stat) => {
+                    if (!err && stat && stat.isFile()) {
+                        const err = undefined;
+                        const path = file;
+                        callback(err, { file: true, path, query });
+                    } else {
+                        callback();
+                    }
+                });
+            }
+        });
+    });
+}

Diff for: css2json-loader.js

@@ -0,0 +1,41 @@
+console.log("Here: " + __dirname);
+
+const parse = require("tns-core-modules/css").parse;
+
+const nl = "\n";
+
+function escape(string) {
+    return JSON.stringify(string);
+}
+
+function importsFrom(ast) {
+    if (!ast || ast.type !== "stylesheet" || !ast.stylesheet) {
+        return [];
+    }
+    return ast.stylesheet.rules
+        .filter(rule => rule.type === "import")
+        .map(importRule => importRule.import.replace(/[\'\"]/gm, ""));
+}
+
+// Identity loader
+module.exports = function(content) {
+    this.cacheable && this.cacheable();
+    this.value = content;
+    const ast = parse(content);
+
+    let dependencies = "";
+
+    importsFrom(ast).forEach(uri => {
+        if (uri[0] === "~" && uri[1] !== "/") {
+            // Require form node modules from `~nativescript-theme` like imports.
+            dependencies += `global.registerModule(${escape(uri)}, () => require(${escape(uri.substr(1))}));${nl}`;
+        } else {
+            dependencies += `global.registerModule(${escape(uri)}, () => require(${escape(uri)});${nl}`;
+        }
+    });
+
+    const str = JSON.stringify(ast, (k, v) => k === "position" ? undefined : v);
+    return `${dependencies}module.exports = ${str};`;
+}
+module.exports.seperable = true;
+