Hello!
I'm using the C# target of ANTLR and have some problems with it.
I'm rewriting the input to the output, but on my way I need to collect
some information about the input (to create StringTemplates on the fly).
I want the $id.text to return the rewritten text of the rule. And I
suppose this should happen, but the runtime crashes instead.
What am I doing wrong?
The grammar:
grammar Test;
options {
language = CSharp2;
output = template;
rewrite = true;
}
start_rule
: id+ {
System.Console.WriteLine($id.text); } // I need to access the text here
;
id : ID -> { new
StringTemplate("id") }
;
ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
;
WS : ( ' ' | '\t' | '\r' | '\n' ) {$channel=HIDDEN;}
;
The driver:
using System;
using Antlr.Runtime;
namespace RewriteTest
{
public class Program
{
public static void Main(string[] args)
{
string input = "ab cd ef gh";
var stream = new ANTLRStringStream(input);
var lexer = new TestLexer(stream);
var tokenStream = new TokenRewriteStream(lexer);
var parser = new TestParser(tokenStream);
parser.start_rule();
Console.WriteLine("----------------------------------------------");
Console.WriteLine(tokenStream.ToOriginalString());
Console.WriteLine(tokenStream.ToString());
}
}
}
The result:
Unhandled Exception: System.InvalidCastException: Unable to cast object
of type 'ReplaceOp' to type 'InsertBeforeOp'.
at Antlr.Runtime.TokenRewriteStream.ToString(String programName,
Int32 start, Int32 end)
at Antlr.Runtime.TokenRewriteStream.ToString(Int32 start, Int32 end)
at Antlr.Runtime.CommonTokenStream.ToString(IToken start, IToken
stop)
at TestParser.start_rule() in C:\Tests\RewriteTest\TestParser.cs:line
147
at RewriteTest.Program.Main(String[] args) in
C:\Tests\RewriteTest\Program.cs:line 18
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