Comments on: Implementing a scripting language with Antlr (Part 2: Parser)

By: scott

scott — Tue, 01 Mar 2011 05:25:00 +0000

I know this is nit picky, but the rest of your article is so well written. I would suggesting fixing these mechanical problems:

1) notation which indicates that we should a->ADD node A with children B
2) is attractive as it builds your objects write->RIGHT into the parser and you can effectively build a custom

By: Sourav

Sourav — Sat, 16 Oct 2010 02:35:02 +0000

Hiiii, structDecl returns[GlobalDeclaration result]

: n=STRUCT IDENT LBRACE f=fieldDeclList+ r=RBRACE

{ $result = new StructDecl(loc(n), n.getText(),f.result); }

;

fieldDeclList returns[FieldDecl result]

:t=type n=IDENT SEMI

{ $result=new FieldDecl(loc(n),t.result,n.getText());}

;

Here in structDecl rule,i am sending loc(n),n.getText() and f.result but my problem is i am sending f as a single variable and i want to send as a list variable,how to do that?

By: M Shekhar

M Shekhar — Mon, 26 Mar 2007 20:45:09 +0000

Alex, I took at look at Vocubularies and seems like that is not what I’m looking for. My problem is similar to this thread that someone had started sometime back, but apparently had no responses.

http://www.antlr.org:8080/pipermail/antlr-interest/2005-September/013603.html

Let me know, if you have any pointers to this problem.

Thanks,
manju

By: M Shekhar

M Shekhar — Mon, 26 Mar 2007 20:36:26 +0000

Thanks Alex, that helps.

By: Alex

Alex — Mon, 26 Mar 2007 13:31:14 +0000

Regarding error handling, I posted about recovering line and column numbers in an AST earlier. Beyond that, I have not done much yet with error recovery in antlr. Antlr does support the integration of multiple grammars and even grammar extension through the notion of "vocabularies". You might check out the antlr doc on Vocabularies for some more info.