example for LangDev'24

examples/ox/examples/LangDev2024.ox

@@ -0,0 +1,77 @@
+// variables: numbers, booleans (void)
+var n: number = 12;
+var b: boolean = true;
+
+// Arithmetics
+var add: number = 23 + 41;
+var subtract: number = 13 - 4;
+var multiply: number = 13 * 4;
+var divide: number = 62 / 2;
+var fractional: number = 61 / 3;
+
+var negateMe: number = -add;
+
+// Comparison and equality
+var less: boolean = add < subtract;
+var more: boolean = multiply > divide;
+
+var equality: boolean = add == subtract;
+var inequality: boolean = multiply != divide;
+
+// Unary logical operator
+var isTrue: boolean = !false;
+var isFalse: boolean = !true;
+
+// Binary logical operator
+var andTrue: boolean = isTrue and !isFalse;
+var orFalse: boolean = !isTrue or isFalse;
+
+// Precedence and grouping
+var min: number = 14;
+var max: number = 22;
+var average: number = (min + max) / 2;
+
+// Variables
+// Can reassign an existing variable
+min = 5;
+
+// If branching
+var kk: number = average * 5;
+if (average > 5) {
+    print 23;
+    if (max < 30 and min > 3) {
+        min = min + 15;
+    }
+} else {
+    print -12;
+}
+
+// While loops
+var a: number = 1;
+while (a < 10) {
+    print a;
+    a = a + 1;
+}
+
+// Functions
+fun inc(a: number): number {
+    return a + 1;
+}
+fun inc(a: boolean): boolean {
+    return !a;
+}
+
+fun printSum(a: number, b: number): void {
+    print inc(true) + inc(inc(b));
+}
+
+fun returnSum(a: number, b: number): number {
+    return a + b;
+}
+
+printSum(3, 2);
+
+print returnSum(32.3, 123.5);
+
+print 12;
+print true;

examples/ox/src/language/ox-type-checking.ts

@@ -9,7 +9,7 @@ import { LangiumSharedServices } from 'langium/lsp';
 import { FUNCTION_MISSING_NAME, FunctionKind, InferOperatorWithMultipleOperands, InferOperatorWithSingleOperand, InferenceRuleNotApplicable, OperatorManager, ParameterDetails, PrimitiveKind, TypirServices, UniqueFunctionValidation } from 'typir';
 import { AbstractLangiumTypeCreator, LangiumServicesForTypirBinding, PartialTypirLangiumServices } from 'typir-langium';
 import { ValidationMessageDetails } from '../../../../packages/typir/lib/features/validation.js';
-import { BinaryExpression, MemberCall, UnaryExpression, isAssignmentStatement, isBinaryExpression, isBooleanLiteral, isForStatement, isFunctionDeclaration, isIfStatement, isMemberCall, isNumberLiteral, isParameter, isPrintStatement, isReturnStatement, isTypeReference, isUnaryExpression, isVariableDeclaration, isWhileStatement } from './generated/ast.js';
+import { BinaryExpression, MemberCall, UnaryExpression, isAssignmentStatement, isBinaryExpression, isBooleanLiteral, isForStatement, isFunctionDeclaration, isIfStatement, isMemberCall, isNumberLiteral, isParameter, isReturnStatement, isTypeReference, isUnaryExpression, isVariableDeclaration, isWhileStatement } from './generated/ast.js';
 
 export class OxTypeCreator extends AbstractLangiumTypeCreator {
     protected readonly typir: TypirServices;
@@ -104,8 +104,8 @@ export class OxTypeCreator extends AbstractLangiumTypeCreator {
                     // use parameters inside expressions
                     return ref.type;
                 } else if (isFunctionDeclaration(ref)) {
-                    // there is already an inference rule for function calls (see above for FunctionDeclaration)!
-                    return 'N/A'; // as an alternative: use 'InferenceRuleNotApplicable' instead, what should we recommend?
+                    // there is already an inference rule for function calls (see below for FunctionDeclaration)!
+                    return InferenceRuleNotApplicable;
                 } else if (ref === undefined) {
                     return InferenceRuleNotApplicable;
                 } else {