{"record":{"id":"8d984ca43938554e","repo":"AvaloniaUI/Avalonia","slug":"unexpected-end-of-the-expression","errorCode":null,"errorMessage":"Unexpected end of the expression","messagePattern":"Unexpected end of the expression","errorType":"exception","errorClass":"ExpressionParseException","httpStatus":null,"severity":"error","filePath":"src/Avalonia.Base/Rendering/Composition/Expressions/ExpressionParser.cs","lineNumber":258,"sourceCode":"\n                var applyUnaryMinus = false;\n                while (parser.TryConsume('-')) \n                    applyUnaryMinus = !applyUnaryMinus;\n\n                Expression? parsed;\n                \n                if (parser.TryConsume('(')) \n                    parsed = ParseTillTerminator(ref parser, \")\", false, true, out _);\n                else if (parser.TryParseCall(out var functionName))\n                {\n                    var parameterList = new List<Expression>();\n                    while (!parser.TryConsume(')'))\n                    {\n                        parameterList.Add(ParseTillTerminator(ref parser, \",)\", false, true, out var closingToken));\n                        if (closingToken == ')')\n                            break;\n                        if (closingToken != ',')\n                            throw new ExpressionParseException(\"Unexpected end of the expression\", parser.Position);\n                    }\n\n                    parsed = new FunctionCallExpression(functionName.ToString(), parameterList);\n                }\n                else if (TryParseAtomic(ref parser, out parsed))\n                {\n                    // do nothing\n                }\n                else\n                    throw new ExpressionParseException(\"Unexpected token\", parser.Position);\n\n                \n                // Parse any following member accesses\n                while (parser.TryConsume('.'))\n                {\n                    if(!parser.TryParseIdentifier(out var memberName))\n                        throw new ExpressionParseException(\"Unexpected token\", parser.Position);\n","sourceCodeStart":240,"sourceCodeEnd":276,"githubUrl":"https://github.com/AvaloniaUI/Avalonia/blob/11c542726898ae954a1ef668c65ec79ec92ab17d/src/Avalonia.Base/Rendering/Composition/Expressions/ExpressionParser.cs#L240-L276","documentation":"Error \"Unexpected end of the expression\" thrown in AvaloniaUI/Avalonia.","triggerScenarios":"Raised when the input ends in the middle of a composition expression construct. Defend by checking for unbalanced parentheses or dangling operators before constructing the animation.","commonSituations":"See trigger scenarios.","solutions":["The expression ends prematurely; add the missing operand or closing parenthesis.","Check that string concatenation building the expression did not truncate it."],"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"}