How to access IContext in .rul file!

[Rupesh Bhurke]

I am trying to test NRules dynamic rules loading from a text file. I am stuck at a place. I dont understand how can we access IContext in dynamic rules file. We need to add Validation Error Objects in Context.

Kindly advice.

Rupesh

[Rupesh Bhurke]

An example rule file will be appreciated!

[Sergiy Nikolayev]

This is not yet supported in the rules language. I added an issue to track this: https://github.com/NRules/NRules.Language/issues/3

[Rupesh Bhurke]

Ok! Thank you!

[Rupesh Bhurke]

Hi Sergiy,

I was trying to work around the problem.

So I created following rul file.

using Domain;

rule "User ID Validation"

when

    var user = User(u => string.IsNullOrWhiteSpace(u.UserID));

    

then

//user.Errors.Add(new ValidationError2("User ID is invalid!"));

Console.WriteLine("Fired");

If uncomment  user.Errors.Add line! I get following exception:

Unhandled Exception: NRules.RuleSharp.CompilationException: Unsupported expression. ExpressionType=object creation

   at NRules.RuleSharp.ExpressionParser.VisitPrimary_expression(Primary_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 144

   at NRules.RuleSharp.RuleSharpParser.Primary_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2661

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitUnary_expression(Unary_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 244

   at NRules.RuleSharp.RuleSharpParser.Unary_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2503

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitMultiplicative_expression(Multiplicative_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 442

   at NRules.RuleSharp.RuleSharpParser.Multiplicative_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2419

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitAdditive_expression(Additive_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 469

   at NRules.RuleSharp.RuleSharpParser.Additive_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2342

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitShift_expression(Shift_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 897

   at NRules.RuleSharp.RuleSharpParser.Shift_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2262

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitRelational_expression(Relational_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 333

   at NRules.RuleSharp.RuleSharpParser.Relational_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2159

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitEquality_expression(Equality_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 419

   at NRules.RuleSharp.RuleSharpParser.Equality_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2065

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitAnd_expression(And_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 408

   at NRules.RuleSharp.RuleSharpParser.And_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1992

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitExclusive_or_expression(Exclusive_or_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 397

   at NRules.RuleSharp.RuleSharpParser.Exclusive_or_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1929

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitInclusive_or_expression(Inclusive_or_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 386

   at NRules.RuleSharp.RuleSharpParser.Inclusive_or_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1866

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitConditional_and_expression(Conditional_and_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 375

   at NRules.RuleSharp.RuleSharpParser.Conditional_and_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1803

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitConditional_or_expression(Conditional_or_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 364

   at NRules.RuleSharp.RuleSharpParser.Conditional_or_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1736

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitNull_coalescing_expression(Null_coalescing_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 322

   at NRules.RuleSharp.RuleSharpParser.Null_coalescing_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1673

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitConditional_expression(Conditional_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 310

   at NRules.RuleSharp.RuleSharpParser.Conditional_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1612

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitNon_assignment_expression(Non_assignment_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 765

   at NRules.RuleSharp.RuleSharpParser.Non_assignment_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1375

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitExpression(ExpressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 754

   at NRules.RuleSharp.RuleSharpParser.ExpressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1311

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitArgument(ArgumentContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 743

   at NRules.RuleSharp.RuleSharpParser.ArgumentContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1231

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitPrimary_expression(Primary_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 206

   at NRules.RuleSharp.RuleSharpParser.Primary_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2661

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitUnary_expression(Unary_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 244

   at NRules.RuleSharp.RuleSharpParser.Unary_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2503

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitMultiplicative_expression(Multiplicative_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 442

   at NRules.RuleSharp.RuleSharpParser.Multiplicative_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2419

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitAdditive_expression(Additive_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 469

   at NRules.RuleSharp.RuleSharpParser.Additive_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2342

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitShift_expression(Shift_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 897

   at NRules.RuleSharp.RuleSharpParser.Shift_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2262

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitRelational_expression(Relational_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 333

   at NRules.RuleSharp.RuleSharpParser.Relational_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2159

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitEquality_expression(Equality_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 419

   at NRules.RuleSharp.RuleSharpParser.Equality_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 2065

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitAnd_expression(And_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 408

   at NRules.RuleSharp.RuleSharpParser.And_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1992

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitExclusive_or_expression(Exclusive_or_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 397

   at NRules.RuleSharp.RuleSharpParser.Exclusive_or_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1929

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitInclusive_or_expression(Inclusive_or_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 386

   at NRules.RuleSharp.RuleSharpParser.Inclusive_or_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1866

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitConditional_and_expression(Conditional_and_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 375

   at NRules.RuleSharp.RuleSharpParser.Conditional_and_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1803

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitConditional_or_expression(Conditional_or_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 364

   at NRules.RuleSharp.RuleSharpParser.Conditional_or_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1736

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitNull_coalescing_expression(Null_coalescing_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 322

   at NRules.RuleSharp.RuleSharpParser.Null_coalescing_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1673

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitConditional_expression(Conditional_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 310

   at NRules.RuleSharp.RuleSharpParser.Conditional_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1612

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitNon_assignment_expression(Non_assignment_expressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 765

   at NRules.RuleSharp.RuleSharpParser.Non_assignment_expressionContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 1375

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitExpression(ExpressionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 754

   at NRules.RuleSharp.ExpressionParser.VisitExpressionStatement(ExpressionStatementContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 29

   at NRules.RuleSharp.RuleSharpParser.ExpressionStatementContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 6652

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.RuleSharpParserBaseVisitor`1.VisitEmbedded_statement(Embedded_statementContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParserBaseVisitor.cs:line 1370

   at NRules.RuleSharp.RuleSharpParser.Embedded_statementContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 6415

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.VisitChildren(IRuleNode node)

   at NRules.RuleSharp.ExpressionParser.VisitEmbeddedStatement(EmbeddedStatementContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 23

   at NRules.RuleSharp.RuleSharpParser.EmbeddedStatementContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 6235

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.ExpressionParser.VisitStatement_list(Statement_listContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\ExpressionParser.cs:line 56

   at NRules.RuleSharp.RuleSharpParser.Statement_listContext.Accept[TResult](IParseTreeVisitor`1 visitor) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 8198

   at Antlr4.Runtime.Tree.AbstractParseTreeVisitor`1.Visit(IParseTree tree)

   at NRules.RuleSharp.RuleParserListener.EnterRule_action(Rule_actionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\RuleParserListener.cs:line 131

   at NRules.RuleSharp.RuleSharpParser.Rule_actionContext.EnterRule(IParseTreeListener listener) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 18631

   at Antlr4.Runtime.Tree.ParseTreeWalker.EnterRule(IParseTreeListener listener, IRuleNode r)

   at Antlr4.Runtime.Tree.ParseTreeWalker.Walk(IParseTreeListener listener, IParseTree t)

   at NRules.RuleSharp.RuleSharpParserListener.EnterRule_definition(Rule_definitionContext context) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\RuleSharpParserListener.cs:line 41

   at NRules.RuleSharp.RuleSharpParser.Rule_definitionContext.EnterRule(IParseTreeListener listener) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\obj\Release\RuleSharpParser.cs:line 18691

   at Antlr4.Runtime.Tree.ParseTreeWalker.EnterRule(IParseTreeListener listener, IRuleNode r)

   at Antlr4.Runtime.Tree.ParseTreeWalker.Walk(IParseTreeListener listener, IParseTree t)

   at NRules.RuleSharp.RuleRepository.Load(AntlrInputStream input) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\RuleRepository.cs:line 124

   at NRules.RuleSharp.RuleRepository.Load(String fileName) in C:\GitHub\NRules.Language\src\NRules.RuleSharp\NRules.RuleSharp\RuleRepository.cs:line 82

   at NRulesDynamicConsole.UserValidationRileFileTest.Run() in d:\Rupesh\WorkData\Self\RnD\C#\DomainSpecificLanguages\NRulesWalkthrough\NRulesDynamicConsole\NRulesDynamicConsole\UserValidationRileFileTest.cs:line 17

   at NRulesDynamicConsole.Program.Main(String[] args) in d:\Rupesh\WorkData\Self\RnD\C#\DomainSpecificLanguages\NRulesWalkthrough\NRulesDynamicConsole\NRulesDynamicConsole\Program.cs:line 10

Kindly guide!

Thank you.

With warm regards,

Rupesh

[Sergiy Nikolayev]

Creating objects in rules actions was not supported either.

I added support for the "new" operator, and also exposed engine's context to rules' actions. I released a new version with these changes, and pushed it to nuget.

Release notes: https://github.com/NRules/NRules.Language/releases/v0.0.3

Nuget: https://www.nuget.org/packages/NRules.RuleSharp/0.0.3

Let me know if you have any issues with it.

Sergiy

[Rupesh Bhurke]

Ok! Thank you. I will check and revert!

[Rupesh Bhurke]

HI Sergiy!

While updating NRules.RuleSharp I face following issue:

The attribute "Remove" in element <None> is unrecognized.  d:\Rupesh\WorkData\Self\RnD\C#\DomainSpecificLanguages\NRulesWalkthrough\NRulesDynamicConsole\packages\Antlr4.CodeGenerator.4.6.5\build\Antlr4.CodeGenerator.props

I tries uninstalling all the packages and the deleting packages folder too.

Upon opening solution VS show message to install missing NuGet packages. It installs NRules. Then If I install the NRules.RuleSharp I get same error.

Kindly Advice.

Rupesh

[Rupesh Bhurke]

Hi Sergiy!

Just to add!

Even when I create a new project and add NuGet packages, we get the same error!

Rupesh

[Sergiy Nikolayev]

While it shouldn't cause an error, what I'm realizing is that I shouldn't have declared Antlr4.CodeGenerator as a dependency. It is needed to build RuleSharp, but it is not needed to run it.

I'm checking with the ANTLR team, and if that's true, I'll republish the package w/o that dependency, which should resolve your issue.

I'll get back to you on this.

Sergiy

[Sergiy Nikolayev]

Please try this out. I dropped the Antlr4.CodeGenerator from the package dependencies, as it is a development dependency only for RuleSharp.

Release notes: https://github.com/NRules/NRules.Language/releases/v0.0.4

NuGet: https://www.nuget.org/packages/NRules.RuleSharp/0.0.4

[Rupesh Bhurke]

Hi Sergiy,

Now I am able to add Nuget Package NRules.RulesSharp to the project. My following rule file works fine:

using Domain;


rule "User ID Validation"

when
    var user = User(u => string.IsNullOrWhiteSpace(u.UserID));
   
then

 user.Errors.Add(new ValidationError2("User ID is invalid!"));

 //Console.WriteLine("Fired");

However, it is not clear how to access context object in Rule file. Could you please furnish with a sample?

Thank you.

With warm Regards,

Rupesh

[Rupesh Bhurke]

Sorry for the delay as there is festive season going on in my part of the world! 

Rupesh

[Sergiy Nikolayev]

You access it via the Context variable. In the release notes you can click on the corresponding issue and see a usage example there as well.

Sergiy

[Sergiy Nikolayev]

Hi Rupesh, please let me know if this worked for you.

Sergiy

[Rupesh Bhurke]

Hi! Sergiy,

Yes, "Context" variable is accessible in "then" part! 

using Domain;


rule "User ID Validation"
when
    var user = User(u => string.IsNullOrWhiteSpace(u.UserID));
   
then

    Context.Insert(new ValidationError("User ID is invalid!"));

[Rupesh Bhurke]

Hi Sergiy!

I have an issue.

While loading Rule Files, I get this exception "CompilationException" but it does not show me which Rule File and exception location.

I am using this version of load:

public void Load(IEnumerable<string> fileNames)

I could use the following version to get which file is causing the problem:

public void Load(string fileName)

But this will still not give me the line of code that causes the error.

Kindly Advice!

Rupesh

[Sergiy Nikolayev]

I added an issue to improve error reporting (https://github.com/NRules/NRules.Language/issues/5).

Is the error message helpful in finding the error?

Sergiy