Merge pull request #1013 from riganti/feature/js-metadata-api

Added helper functions for working with type metadata

src/DotVVM.Framework/Resources/Scripts/dotvvm-root.ts

@@ -25,6 +25,7 @@ import * as viewModuleManager from './viewModules/viewModuleManager'
 import { notifyModuleLoaded } from './postback/resourceLoader'
 import { logError, logWarning, logInfo, logInfoVerbose, level, logPostBackScriptError } from "./utils/logging"
 import { orderBy, orderByDesc } from './collections/sortingHelper'
+import * as metadataHelper from './metadata/metadataHelper'
 import * as arrayHelper from './collections/arrayHelper'
 import * as stringHelper from './utils/stringHelper'
 
@@ -99,6 +100,12 @@ const dotvvmExports = {
         parseDate,
         deserialize
     },
+    metadata: {
+        getTypeId: metadataHelper.getTypeId,
+        getTypeMetadata: metadataHelper.getTypeMetadata,
+        getEnumMetadata: metadataHelper.getEnumMetadata,
+        getEnumValue: metadataHelper.getEnumValue
+    },
     viewModules: {
         registerOne: viewModuleManager.registerViewModule,
         init: viewModuleManager.initViewModule,

src/DotVVM.Framework/Resources/Scripts/metadata/metadataHelper.ts

@@ -0,0 +1,28 @@
+import { getTypeInfo } from "./typeMap";
+
+export function getTypeId(viewModel: object): string | undefined {
+    return ko.unwrap((viewModel as any).$type);
+}
+
+export function getTypeMetadata(typeId: string): TypeMetadata {
+    return getTypeInfo(typeId);
+}
+
+export function getEnumMetadata(enumMetadataId: string): EnumTypeMetadata {
+    let metadata = getTypeInfo(enumMetadataId);
+    if (metadata.type !== "enum") {
+        throw new Error("Expected enum, but received object");
+    }
+
+    return metadata as EnumTypeMetadata;
+}
+
+export function getEnumValue(identifier: string | number, enumMetadataId: string): number | undefined {
+    let metadata = getEnumMetadata(enumMetadataId);
+    if (typeof identifier === "string") {
+        return metadata.values[identifier];
+    }
+    else {
+        return identifier;
+    }
+}