{"record":{"id":"d3b516bec1c62246","repo":"AvaloniaUI/Avalonia","slug":"unexpected-end-of-expression-d3b516","errorCode":null,"errorMessage":"Unexpected end of  expression","messagePattern":"Unexpected end of  expression","errorType":"exception","errorClass":"ExpressionParseException","httpStatus":null,"severity":"error","filePath":"src/Avalonia.Base/Rendering/Composition/Expressions/ExpressionParser.cs","lineNumber":212,"sourceCode":"            bool throwOnEnd,\n            out char? token)\n        {\n            ExpressionOperatorGroup left = default;\n            token = null;\n            while (true)\n            {\n                if (parser.TryConsumeAny(terminatorChars.AsSpan(), out var consumedToken))\n                {\n                    if (throwOnTerminator || left.Empty)\n                        throw new ExpressionParseException($\"Unexpected '{token}'\", parser.Position - 1);\n                    token = consumedToken;\n                    return left.ToExpression();\n                }\n                parser.SkipWhitespace();\n                if (parser.Length == 0)\n                {\n                    if (throwOnEnd || left.Empty)\n                        throw new ExpressionParseException(\"Unexpected end of  expression\", parser.Position);\n                    return left.ToExpression();\n                }\n                \n                ExpressionType? op = null;\n                if (left.NotEmpty)\n                {\n                    if (parser.TryConsume('?'))\n                    {\n                        var truePart = ParseTillTerminator(ref parser, \":\",\n                            false, true, out _);\n                        // pass through the current parsing rules to consume the rest\n                        var falsePart = ParseTillTerminator(ref parser, terminatorChars, throwOnTerminator, throwOnEnd,\n                            out token);\n                        \n                        return new ConditionalExpression(left.ToExpression(), truePart, falsePart);\n                    }\n                    \n                    // We expect a binary operator here","sourceCodeStart":194,"sourceCodeEnd":230,"githubUrl":"https://github.com/AvaloniaUI/Avalonia/blob/11c542726898ae954a1ef668c65ec79ec92ab17d/src/Avalonia.Base/Rendering/Composition/Expressions/ExpressionParser.cs#L194-L230","documentation":"Error \"Unexpected end of  expression\" thrown in AvaloniaUI/Avalonia.","triggerScenarios":"Raised when a composition expression ends before the parser expects it to (e.g. after an operator or open parenthesis). Defend by ensuring expressions are complete and balanced before passing them to ExpressionAnimation.","commonSituations":"See trigger scenarios.","solutions":["Complete the expression: an operand or closing delimiter is missing at the end of the string.","Ensure balanced parentheses and that every binary operator is followed by a value or identifier."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"11c542726898ae954a1ef668c65ec79ec92ab17d","analyzedAt":"2026-08-13T11:57:40.261Z","schemaVersion":2},"datasetVersion":"2026-08-13T14:17:21.547Z"}