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Is there a working C++ grammar file for ANTLR?


Is there a working C++ grammar file for ANTLR?

By : Captainlawid
Date : October 23 2020, 11:12 PM
it fixes the issue C++ parsers are tough to build.
I can't speak with experience about using ANTLR's C++ grammars. Here I discuss what I learned by reading the notes attached to the the one I did see at the ANTLR site; in essence, the author produced an incomplete grammar. And that was for just C++98. It has been awhile since I looked; there may be others.
code :


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Can anyone help me convert this ANTLR 2.0 grammar file to ANTLR 3.0 syntax?

Can anyone help me convert this ANTLR 2.0 grammar file to ANTLR 3.0 syntax?


By : doniking
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I've converted the 'easy' parts (fragment, @header and @member declerations etc.), but since I'm new to Antlr I have a really hard time converting the Tree statements etc.
code :
n3Directive0!:
                d=AT_PREFIX ns=nsprefix u=uriref
                {directive($d, $ns, $u);}
                ;
Custom ANTLR grammar not working for every input

Custom ANTLR grammar not working for every input


By : Jiliane Jones Lynn
Date : March 29 2020, 07:55 AM
seems to work fine BATMAN is being tokenized as a LHSOPERAND token. You must realize that the lexer does not take into account what the parser "needs" at a particular time. The lexer simply tries to match as much as possible, and in case 2 (or more) rules match the same amount of characters (LHSOPERAND and RHSOPERAND in your case), the rule defined first will "win", which is the LHSOPERAND rule.
EDIT
code :
grammar RuleGrammar;

prog
 : condition EOF
 ;

condition
 : logical
 ;

logical
 : relational ((AND | OR) relational)*
 ;

relational
 : STRINGVALUE ((GT | GTEQ | LT | LTEQ | EQ | NEQ) term)?
 ;

term
 : STRINGVALUE
 | NUMBERVALUE
 | '(' condition ')'
 ;

GT          : '>';
GTEQ        : '>=';
LT          : '<';
LTEQ        : '<=';
EQ          : '=';
NEQ         : '<>';
NUMBERVALUE : '0'..'9'+;
AND         : 'AND';
OR          : 'OR';
STRINGVALUE : ('a'..'z' | 'A'..'Z' | '_')+;
SPACE       : ' ' {skip();};
PERSON_NAME = BATMAN OR age <> 42
Visitor methods for Java grammar not working in ANTLR 4.4

Visitor methods for Java grammar not working in ANTLR 4.4


By : user4981497
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The generated parse tree visitor extends AbstractParseTreeVisitor, which has two methods which would be helpful to override to get the result you are looking for.
Firstly, AbstractParseTreeVisitor#defaultResult() returns the default result for every node in the parse tree you visit. By default, it returns null.
Need help compilig an ANTLR grammar file

Need help compilig an ANTLR grammar file


By : LockBeloStock
Date : March 29 2020, 07:55 AM
I wish this help you This is explained in the Antlr4 "Getting Started" page.
Doing it by hand is as simple as this:
What would I need to do to implement a grammar, parser and lexer in Antlr programatically without a grammar file?

What would I need to do to implement a grammar, parser and lexer in Antlr programatically without a grammar file?


By : user1987
Date : October 13 2020, 10:00 PM
fixed the issue. Will look into that further I think this would be completely unpractical in general case. Antlr is a tool that generates parsers from grammar files... if you take away generating parsers (because that is "generating code") and using grammar files, then, really, you are just taking away the whole Antlr.
You could probably use some parts of the runtime library (perhaps ATNs? or some lower-level stuff, like CharacterStream), but on the whole you would pretty much need to write your own general parser / lexer from scratch.
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