[Antlr4] for CSharp how to output AST

[Michael Powell]

Hello,

How do I output the AST for CSharp?

options { 
  output=AST; 
}

I am getting these kinds of errors:

Severity	Code	Description	Project	File	Line	Suppression State
Error	AC0050	'^' came as a complete surprise to me	Kingdom.OrTools.Sat.Params.Antlr	path\to\src\Kingdom.OrTools.Sat.Params.Antlr\Protov2.g4	240	

Over things such as this:

SYNTAX: 'syntax';

syntaxDecl

  : SYNTAX^ '=' (

    '\'proto2\''

    | '"proto2"'

    )/*{My.OrTools.Sat.SyntaxKind.Proto2}*/ ';'

;

Eventually, I would also like to synthesize actual target language level values such as:

enum My.OrTools.Sat.SyntaxKind {

    Proto2

}

Thoughts?

Thanks in advance...

Best regards,

Michael W Powell

[Mike Lischke]

How do I output the AST for CSharp?

ANTLR4 generated parsers no longer produce an AST, but a syntax tree. The difference is:

AST - a more or less structured list/tree of all input tokens

Parse Tree - a structured view on the parser rules that have been matched

The parse tree consists of parser rule contexts, which have start and end tokens (or in case of terminal nodes just a single symbol), which essentially carry the same information as the AST.

options { 
  output=AST; 
}

Not supported anymore.

SYNTAX: 'syntax';

syntaxDecl

  : SYNTAX^ '=' (

    '\'proto2\''

    | '"proto2"'

    )/*{My.OrTools.Sat.SyntaxKind.Proto2}*/ ';'

;

Tree rewrite rules are no longer supported. That is ANTLR3 syntax.

Mike
-- 
www.soft-gems.net

[Michael Powell]

Thanks for clarifying that. 

Mike

-- 
www.soft-gems.net