Hello,
I tried to access a dynamic object by index and the library seems to be unable to parse the expression on .NET Core 3.1 and .NET 4.7.2.
using DynamicExpresso;
using System;
using System.Dynamic;
using System.Collections.Generic;
public class Program
{
public class Globals {
private readonly DynamicIndexAccess _values = new DynamicIndexAccess();
public dynamic Values { get { return _values; } }
}
public class DynamicIndexAccess : DynamicObject {
private readonly IReadOnlyDictionary<string, object> _values;
public DynamicIndexAccess()
{
var values = new Dictionary<string, object>();
values.Add("Hello", "Hello World!");
_values = values;
}
public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
{
return _values.TryGetValue((string)indexes[0], out result);
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
return _values.TryGetValue(binder.Name, out result);
}
}
public static void Main()
{
Globals globals = new Globals();
Interpreter interpreter = new Interpreter()
.SetVariable("Values", globals.Values);
// runs
Console.WriteLine(globals.Values.Hello);
// runs
Console.WriteLine(interpreter.Eval<string>("Values.Hello"));
// runs
Console.WriteLine(globals.Values["Hello"]);
// fails
Console.WriteLine(interpreter.Eval<string>("Values[\"Hello\"]"));
}
}Stacktrace
DynamicExpresso.Exceptions.ParseException: No applicable indexer exists in type 'DynamicIndexAccess' (at index 6).
at DynamicExpresso.Parsing.Parser.ParseElementAccess(Expression expr)
at DynamicExpresso.Parsing.Parser.ParsePrimary()
at DynamicExpresso.Parsing.Parser.ParseUnary()
at DynamicExpresso.Parsing.Parser.ParseMultiplicative()
at DynamicExpresso.Parsing.Parser.ParseAdditive()
at DynamicExpresso.Parsing.Parser.ParseTypeTesting()
at DynamicExpresso.Parsing.Parser.ParseComparison()
at DynamicExpresso.Parsing.Parser.ParseLogicalAnd()
at DynamicExpresso.Parsing.Parser.ParseLogicalXor()
at DynamicExpresso.Parsing.Parser.ParseLogicalOr()
at DynamicExpresso.Parsing.Parser.ParseConditionalAnd()
at DynamicExpresso.Parsing.Parser.ParseConditionalOr()
at DynamicExpresso.Parsing.Parser.ParseConditional()
at DynamicExpresso.Parsing.Parser.ParseAssignment()
at DynamicExpresso.Parsing.Parser.ParseExpressionSegment()
at DynamicExpresso.Parsing.Parser.ParseExpressionSegment(Type returnType)
at DynamicExpresso.Parsing.Parser.Parse()
at DynamicExpresso.Interpreter.ParseAsLambda(String expressionText, Type expressionType, Parameter[] parameters)
at DynamicExpresso.Interpreter.Parse(String expressionText, Type expressionType, Parameter[] parameters)
at DynamicExpresso.Interpreter.Eval(String expressionText, Type expressionType, Parameter[] parameters)
at DynamicExpresso.Interpreter.Eval[T](String expressionText, Parameter[] parameters)
at Program.Main()
Reproduction using the code above is available as fiddle.
Hello,
I tried to access a dynamic object by index and the library seems to be unable to parse the expression on .NET Core 3.1 and .NET 4.7.2.
Stacktrace
Reproduction using the code above is available as fiddle.