CODEWITHSUNDEEP
c#antlr4
Neil Pittman
Neil Pittman

Reputation: 379

Antlr4 target C# error

I have setup my C# project to use the Antlr4 build targets and extension for compiling the g4 grammer. However, when I build I am getting the following errors. Any thoughts?

Error   1   The name 'HIDDEN' does not exist in the current context C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Lexer.cs   131 22  oracle
Error   2   The name 'HIDDEN' does not exist in the current context C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Lexer.cs   136 22  oracle
Error   4   The name 'HIDDEN' does not exist in the current context C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Lexer.cs   145 22  oracle
Error   5   'Antlr4.Runtime.ICharStream' does not contain a definition for 'LA' and no extension method 'LA' accepting a first argument of type 'Antlr4.Runtime.ICharStream' could be found (are you missing a using directive or an assembly reference?)   C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Lexer.cs   156 25  oracle
Error   6   'Antlr4.Runtime.ICharStream' does not contain a definition for 'LA' and no extension method 'LA' accepting a first argument of type 'Antlr4.Runtime.ICharStream' could be found (are you missing a using directive or an assembly reference?)   C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Lexer.cs   156 44  oracle
Error   7   'Antlr4.Runtime.ICharStream' does not contain a definition for 'LA' and no extension method 'LA' accepting a first argument of type 'Antlr4.Runtime.ICharStream' could be found (are you missing a using directive or an assembly reference?)   C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Lexer.cs   156 64  oracle
Error   8   'Antlr4.Runtime.ICharStream' does not contain a definition for 'LA' and no extension method 'LA' accepting a first argument of type 'Antlr4.Runtime.ICharStream' could be found (are you missing a using directive or an assembly reference?)   C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Lexer.cs   156 84  oracle
Error   9   The name 'EOF' does not exist in the current context    C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Parser.cs  920 23  oracle
Error   10  'oracle.Verilog2001Parser' does not contain a definition for 'EOF'  C:\gNOSIS\Oracle\Software\oracle\oracle\obj\x64\Debug\Verilog2001Parser.cs  875 66  oracle

Upvotes: 1

Views: 976

Answers (2)

Onur
Onur

Reputation: 5205

For the "La" / "LA" part you can add some extension methods to fix it:

namespace Antlr4.Runtime
{
    public static class AntlrCsCompatability
    {
        public static int LA(this ICharStream self, int i)
        {
            return self.La(i: i);
        }
    }
}

Same holds true for the Lexer:

namespace GeneratedCode.ANTLR4
{
    public partial class STLexer
    {
        public const int EOF = Eof;
        public const int HIDDEN = Hidden;
    }

}

Upvotes: -1

Sam Harwell
Sam Harwell

Reputation: 99859

This, along with a few other related issues, was fixed in the following recent series of commits:

https://github.com/sharwell/antlr4cs/compare/2ac3c964...c0aa59cb

These changes will be included in the next release. Until then you can use the following in your lexer grammar (for combined grammars use @lexer::members):

@members {
    public const int EOF = Eof;
    public const int HIDDEN = Hidden;
}

Errors 5-8 are related to semantic predicates in your grammar. In the C# target, the lookahead method is La, not LA.

Upvotes: 2

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