Print numbers overflowing the float limit as math.huge (#828)

hazzard993 · web-flow · commit bb02542872ab · 2020-02-24T22:21:47.000+01:00
diff --git a/src/transformation/visitors/literal.ts b/src/transformation/visitors/literal.ts
@@ -60,6 +60,16 @@ export function createShorthandIdentifier(
     return identifier;
 }
 
+const transformNumericLiteralExpression: FunctionVisitor<ts.NumericLiteral> = expression => {
+    if (expression.text === "Infinity") {
+        const math = lua.createIdentifier("math");
+        const huge = lua.createStringLiteral("huge");
+        return lua.createTableIndexExpression(math, huge, expression);
+    }
+
+    return lua.createNumericLiteral(Number(expression.text), expression);
+};
+
 const transformObjectLiteralExpression: FunctionVisitor<ts.ObjectLiteralExpression> = (expression, context) => {
     let properties: lua.TableFieldExpression[] = [];
     const tableExpressions: lua.Expression[] = [];
@@ -142,7 +152,7 @@ export const literalVisitors: Visitors = {
     [ts.SyntaxKind.NullKeyword]: node => lua.createNilLiteral(node),
     [ts.SyntaxKind.TrueKeyword]: node => lua.createBooleanLiteral(true, node),
     [ts.SyntaxKind.FalseKeyword]: node => lua.createBooleanLiteral(false, node),
-    [ts.SyntaxKind.NumericLiteral]: node => lua.createNumericLiteral(Number(node.text), node),
+    [ts.SyntaxKind.NumericLiteral]: transformNumericLiteralExpression,
     [ts.SyntaxKind.StringLiteral]: node => lua.createStringLiteral(node.text, node),
     [ts.SyntaxKind.NoSubstitutionTemplateLiteral]: node => lua.createStringLiteral(node.text, node),
     [ts.SyntaxKind.ObjectLiteralExpression]: transformObjectLiteralExpression,
diff --git a/test/unit/builtins/numbers.spec.ts b/test/unit/builtins/numbers.spec.ts
@@ -74,3 +74,7 @@ test("number intersected method", () => {
         return ({ normalize: () => 3 } as Vector).normalize();
     `.expectToMatchJsResult();
 });
+
+test("numbers overflowing the float limit become math.huge", () => {
+    util.testExpression`1e309`.expectToMatchJsResult();
+});
