Generate language meta data

examples/arithmetics/src/language-server/generated/meta-data.ts

@@ -0,0 +1,9 @@
+/******************************************************************************
+ * This file was generated by langium-cli 0.1.0.
+ * DO NOT EDIT MANUALLY!
+ ******************************************************************************/
+
+export class ArithmeticsLanguageMetaData {
+    languageId = 'arithmetics';
+    extensions = ['.calc'];
+}

examples/arithmetics/src/language-server/generated/module.ts

@@ -6,12 +6,14 @@
 import { LangiumGeneratedServices, LangiumServices, Module } from 'langium';
 import { ArithmeticsAstReflection } from './ast';
 import { ArithmeticsGrammarAccess } from './grammar-access';
+import { ArithmeticsLanguageMetaData } from './meta-data';
 import { Parser } from './parser';
 
 export const ArithmeticsGeneratedModule: Module<LangiumServices, LangiumGeneratedServices> = {
     parser: {
         LangiumParser: (injector) => new Parser(injector)
     },
     GrammarAccess: () => new ArithmeticsGrammarAccess(),
-    AstReflection: () => new ArithmeticsAstReflection()
+    AstReflection: () => new ArithmeticsAstReflection(),
+    LanguageMetaData: () => new ArithmeticsLanguageMetaData()
 };

examples/domainmodel/src/language-server/generated/meta-data.ts

@@ -0,0 +1,9 @@
+/******************************************************************************
+ * This file was generated by langium-cli 0.1.0.
+ * DO NOT EDIT MANUALLY!
+ ******************************************************************************/
+
+export class DomainModelLanguageMetaData {
+    languageId = 'domain-model';
+    extensions = ['.dmodel'];
+}

examples/domainmodel/src/language-server/generated/module.ts

@@ -6,12 +6,14 @@
 import { LangiumGeneratedServices, LangiumServices, Module } from 'langium';
 import { DomainModelAstReflection } from './ast';
 import { DomainModelGrammarAccess } from './grammar-access';
+import { DomainModelLanguageMetaData } from './meta-data';
 import { Parser } from './parser';
 
 export const DomainModelGeneratedModule: Module<LangiumServices, LangiumGeneratedServices> = {
     parser: {
         LangiumParser: (injector) => new Parser(injector)
     },
     GrammarAccess: () => new DomainModelGrammarAccess(),
-    AstReflection: () => new DomainModelAstReflection()
+    AstReflection: () => new DomainModelAstReflection(),
+    LanguageMetaData: () => new DomainModelLanguageMetaData()
 };

examples/statemachine/src/language-server/generated/meta-data.ts

@@ -0,0 +1,9 @@
+/******************************************************************************
+ * This file was generated by langium-cli 0.1.0.
+ * DO NOT EDIT MANUALLY!
+ ******************************************************************************/
+
+export class StatemachineLanguageMetaData {
+    languageId = 'statemachine';
+    extensions = ['.statemachine'];
+}

examples/statemachine/src/language-server/generated/module.ts

@@ -6,12 +6,14 @@
 import { LangiumGeneratedServices, LangiumServices, Module } from 'langium';
 import { StatemachineAstReflection } from './ast';
 import { StatemachineGrammarAccess } from './grammar-access';
+import { StatemachineLanguageMetaData } from './meta-data';
 import { Parser } from './parser';
 
 export const StatemachineGeneratedModule: Module<LangiumServices, LangiumGeneratedServices> = {
     parser: {
         LangiumParser: (injector) => new Parser(injector)
     },
     GrammarAccess: () => new StatemachineGrammarAccess(),
-    AstReflection: () => new StatemachineAstReflection()
+    AstReflection: () => new StatemachineAstReflection(),
+    LanguageMetaData: () => new StatemachineLanguageMetaData()
 };

package.json

@@ -6,6 +6,7 @@
     "build": "tsc -b tsconfig.build.json",
     "watch": "tsc -b tsconfig.build.json -w",
     "lint": "npm run lint --workspaces",
+    "langium:generate": "npm run langium:generate --workspace=langium --workspace=domainmodel --workspace=arithmetics --workspace=statemachine",
     "prepare": "npm run clean && npm run build"
   },
   "devDependencies": {

packages/langium-cli/src/generate.ts

@@ -14,6 +14,7 @@ import { generateModule } from './generator/module-generator';
 import { generateTextMate } from './generator/textmate-generator';
 import path from 'path';
 import { serializeGrammar } from './generator/grammar-serializer';
+import { generateMetaData } from './generator/meta-data-generator';
 
 export type GenerateOptions = {
     file?: string;
@@ -58,6 +59,9 @@ export function generate(opts: GenerateOptions): void {
     const genAst = generateAst(grammar, pack.langium);
     fs.writeFileSync(`${output}/ast.ts`, genAst);
 
+    const metaData = generateMetaData(grammar, pack.langium);
+    fs.writeFileSync(`${output}/meta-data.ts`, metaData);
+
     console.log('Generating dependency injection module...');
     const genModule = generateModule(grammar, pack.langium);
     fs.writeFileSync(`${output}/module.ts`, genModule);

packages/langium-cli/src/generator/meta-data-generator.ts

@@ -0,0 +1,27 @@
+/******************************************************************************
+ * Copyright 2021 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+
+import { CompositeGeneratorNode, Grammar, NL, processGeneratorNode } from 'langium';
+import { LangiumConfig } from '../package';
+import { generatedHeader } from './util';
+
+export function generateMetaData(grammar: Grammar, config: LangiumConfig): string {
+    const node = new CompositeGeneratorNode();
+    node.append(generatedHeader, 'export class ', grammar.name, 'LanguageMetaData {', NL);
+    node.indent(classBody => {
+        classBody.append(`languageId = '${config.languageId}';`, NL);
+        classBody.append(`extensions = [${config.extensions && config.extensions.map(e => appendQuotesAndDot(e)).join(', ')}];`, NL);
+    });
+    node.append('}', NL);
+    return processGeneratorNode(node);
+}
+
+function appendQuotesAndDot(input: string): string {
+    if (!input.startsWith('.')) {
+        input = '.' + input;
+    }
+    return `'${input}'`;
+}

packages/langium-cli/src/generator/module-generator.ts

@@ -21,6 +21,7 @@ export function generateModule(grammar: langium.Grammar, config: LangiumConfig):
     node.append(
         'import { ', grammar.name, "AstReflection } from './ast';", NL,
         'import { ', grammar.name, "GrammarAccess } from './grammar-access';", NL,
+        'import { ', grammar.name, "LanguageMetaData } from './meta-data';", NL,
         "import { Parser } from './parser';", NL, NL
     );
 
@@ -33,7 +34,8 @@ export function generateModule(grammar: langium.Grammar, config: LangiumConfig):
         moduleNode.append(
             '},', NL,
             'GrammarAccess: () => new ', grammar.name, 'GrammarAccess(),', NL,
-            'AstReflection: () => new ', grammar.name, 'AstReflection()', NL
+            'AstReflection: () => new ', grammar.name, 'AstReflection(),', NL,
+            'LanguageMetaData: () => new ', grammar.name, 'LanguageMetaData()', NL
         );
     });
     node.append('};', NL);

packages/langium/package.json

@@ -29,6 +29,7 @@
     "publish:latest": "npm publish --tag latest"
   },
   "langium": {
+    "languageId": "langium",
     "grammar": "src/grammar/langium-grammar.langium",
     "extensions": [
       "langium"

packages/langium/src/grammar/generated/meta-data.ts

@@ -0,0 +1,9 @@
+/******************************************************************************
+ * This file was generated by langium-cli 0.1.0.
+ * DO NOT EDIT MANUALLY!
+ ******************************************************************************/
+
+export class LangiumGrammarLanguageMetaData {
+    languageId = 'langium';
+    extensions = ['.langium'];
+}

packages/langium/src/grammar/generated/module.ts

@@ -7,12 +7,14 @@ import { Module } from '../../dependency-injection';
 import { LangiumGeneratedServices, LangiumServices } from '../../services';
 import { LangiumGrammarAstReflection } from './ast';
 import { LangiumGrammarGrammarAccess } from './grammar-access';
+import { LangiumGrammarLanguageMetaData } from './meta-data';
 import { Parser } from './parser';
 
 export const LangiumGrammarGeneratedModule: Module<LangiumServices, LangiumGeneratedServices> = {
     parser: {
         LangiumParser: (injector) => new Parser(injector)
     },
     GrammarAccess: () => new LangiumGrammarGrammarAccess(),
-    AstReflection: () => new LangiumGrammarAstReflection()
+    AstReflection: () => new LangiumGrammarAstReflection(),
+    LanguageMetaData: () => new LangiumGrammarLanguageMetaData()
 };

packages/langium/src/grammar/language-meta-data.ts

@@ -0,0 +1,10 @@
+/******************************************************************************
+ * Copyright 2021 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+
+export interface LanguageMetaData {
+    languageId: string;
+    extensions: string[];
+}

packages/langium/src/index.ts

@@ -18,6 +18,7 @@ export * from './grammar/generated/parser';
 export * from './grammar/grammar-access';
 export * from './grammar/grammar-util';
 export * from './grammar/langium-grammar-module';
+export * from './grammar/language-meta-data';
 export * from './lsp/completion/completion-provider';
 export * from './lsp/completion/follow-element-computation';
 export * from './lsp/completion/rule-interpreter';

packages/langium/src/services.ts

@@ -24,13 +24,15 @@ import { DocumentHighlighter } from './lsp/document-highlighter';
 import { References } from './references/references';
 import { ValidationRegistry } from './validation/validation-registry';
 import { DocumentValidator } from './validation/document-validator';
+import { LanguageMetaData } from './grammar/language-meta-data';
 
 export type LangiumGeneratedServices = {
     parser: {
         LangiumParser: LangiumParser
     }
     AstReflection: AstReflection
     GrammarAccess: GrammarAccess
+    LanguageMetaData: LanguageMetaData
 }
 
 export type LangiumLspServices = {