Generate errors cause langium-cli to fail with exit code 2 (#1437)

Author: bjthehun

packages/langium-cli/src/generate.ts

@@ -45,9 +45,9 @@ export async function generate(options: GenerateOptions): Promise<boolean> {
         printSuccess(result);
         console.log(getTime() + 'Langium generator will continue running in watch mode.');
         await runWatcher(config, options, await allGeneratorFiles(result));
-    } else {
-        console.log(`Langium generator finished ${chalk.green.bold('successfully')} in ${elapsedTime()}ms`);
     }
+    // Outside of watch mode, report elapsed time for successful generation.
+    printSuccess(result);
     return result.success;
 }
 

packages/langium-cli/src/langium.ts

@@ -19,10 +19,18 @@ program
     .option('-w, --watch', 'enables watch mode', false)
     .addOption(new Option('-m, --mode <mode>', 'used mode for optimized builds for your current environment').choices(['development', 'production']))
     .action((options: GenerateOptions) => {
-        generate(options).catch(err => {
-            console.error(err);
-            process.exit(1);
-        });
+        generate(options)
+            .then(success => {
+                if(!success) {
+                    process.exit(2);
+                }
+                else {
+                    process.exit(0);
+                }
+            }).catch(err => {
+                console.error(err);
+                process.exit(1);
+            });
     });
 
 program.command('extract-types')

packages/langium/src/grammar/validation/validator.ts

@@ -23,6 +23,7 @@ import * as ast from '../../languages/generated/ast.js';
 import { getTypeNameWithoutError, hasDataTypeReturn, isPrimitiveGrammarType, isStringGrammarType, resolveImport, resolveTransitiveImports } from '../internal-grammar-util.js';
 import { typeDefinitionToPropertyType } from '../type-system/type-collector/declared-types.js';
 import { flattenPlainType, isPlainReferenceType } from '../type-system/type-collector/plain-types.js';
+import { AstUtils } from '../../index.js';
 
 export function registerValidationChecks(services: LangiumGrammarServices): void {
     const registry = services.validation.ValidationRegistry;
@@ -687,11 +688,17 @@ export class LangiumGrammarValidator {
             }
             return result;
         };
-        const isNotAFragment = call.rule.ref !== undefined && !call.rule.ref.fragment;
-        const appearsMultipleTimes = findContainerWithCardinality(call) !== undefined;
-        const hasAssignment = call.$container && call.$container.$type === ast.Assignment;
+        // Locate called rule, ensure it is not a fragment.
+        const refersToFragment = call.rule.ref !== undefined && call.rule.ref.fragment;
+        // Data type rules do not cause problems, too.
+        const callInDataTypeRule = (AstUtils.getContainerOfType(call, ast.isParserRule))?.dataType !== undefined;
+        if (refersToFragment || callInDataTypeRule) {
+            return;
+        }
 
-        if (appearsMultipleTimes && !hasAssignment && isNotAFragment) {
+        const appearsMultipleTimes = findContainerWithCardinality(call) !== undefined;
+        const hasAssignment = AstUtils.getContainerOfType(call, ast.isAssignment) !== undefined;
+        if (appearsMultipleTimes && !hasAssignment) {
             accept('error', `Rule call ${call.rule.$refText} requires assignment when used with multiplicity.`, {
                 node: call,
                 property: 'cardinality'

packages/langium/test/grammar/grammar-validator.test.ts

@@ -151,14 +151,19 @@ describe('Langium grammar validation', () => {
         grammar RuleCallMult
 
         entry List1:
-            '(' Mult (',' Mult)* ')' '/' List2 '/' List3;
+            '(' Mult (',' Mult)* ')' '/' List2 '/' List3 '/' List4;
         List2:
             Plus+;
         List3:
             Exp+;
+        // addresses https://github.com/eclipse-langium/langium/pull/1437#pullrequestreview-1994232830
+        List4:
+            elems += (Minus | Div);
         
         Mult: content=ID;
         Plus: content=ID;
+        Minus: '-' variable=ID;
+        Div: 'div' variable=ID;
         fragment Exp: content+=ID;
         
         terminal ID: /[_a-zA-Z][\\w_]*/;