Capturing unstructured text surrounded by structured code

[nedoxff]

I am currently making a small compiled scripting language with ANTLR, and it's going great! However, I also wanted to implement embedding raw C++ code, and I got stuck a bit on how to parse this:

raw {                // structured (part of the scripting language)
   while(true) {     // unstructured (raw string)
   }                 // unstructured (raw string)
}                    // structured (part of the scripting language)

and I'm wondering if it's possible at all.

I have tried:

• Making a separate lexer mode and switching to it when entering a raw block:

StartRaw: 'raw {' -> pushMode(InRawBlock);
mode InRawBlock;
    EndRaw: '}' -> popMode;
    AnyRaw: .;
rawBlock: StartRaw AnyRaw* EndRaw;

It fails because both the raw block and while end with }, so it pops the InRawBlock mode when the first } is found.

• Playing around with predicates
  I'm not so experienced with them, so I couldn't think of any way to not stop capturing the string until the } token of the raw block is met.
• Scrolling stackoverflow
  There were similar questions, but I unfortunately couldn't adapt any of the suggested answers.

Thanks in advance!

[nedoxff]

It's saddening that I can't delete a discussion :(
I found the solution in the documentation.
A recursive parser rule was enough:

genericBlock: LeftBrace (. | genericBlock)*? RightBrace;

And to get the text inside the block:

var start = [...].genericBlock().Start.StartIndex;
var end = [...].genericBlock().Stop.StopIndex;
var code = context.Start.InputStream.GetText(new Interval(start, end))[1..^1];