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Why does parser generated by ANTLR reuse context objects?

By : user2176712
Date : October 14 2020, 02:15 PM
I wish this help you I'm trying to create an interpreter for a simple programming language using ANTLR. I would like to add the feature of recursion. ,
Why does parser generated by ANTLR reuse context objects?
code :
function f(x) {
  return f(x);
| left=numericexpression op=('*'|'/') right=numericexpression #MulOrDiv
| left=numericexpression op=('+'|'-') right=numericexpression #PlusOrMinus

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Scala parser combinators vs ANTLR/Java generated parser?

By : user3074758
Date : March 29 2020, 07:55 AM
To fix this issue Scala's parser combinators aren't very efficient. They weren't designed to be. They're good for doing small tasks with relatively small inputs.
So it really depends on your requirements. There shouldn't be any interop problems with ANTLR. Calling Scala from Java can get hairy, but calling Java from Scala almost always just works.

How to add attribute to ANTLR generated C parser?

By : user3683129
Date : March 29 2020, 07:55 AM
hope this fix your issue One possible solution is to use ANTLR named scopes instead of a global member section.
The following implementation should correspond to what you are looking for:
code :
scope GlobalScope
    ParserHelper* parserHelper;

scope GlobalScope
@init {
  // Initialize the scope attributes
  // Somehow retrieve or create a PointerHelper (you can eventually pass it by an argument of the rootRule)
  $GlobalScope::parserHelper = ...;

:   'const' type_specifier ID ('[' constant_expression ']')? '=' initializer
        $GlobalScope::parserHelper->addConstant($type_specifier.text, $ID.text);

how can I test a parser generated by antlr v4?

By : NatC
Date : March 29 2020, 07:55 AM
help you fix your problem You need to test that all the available correct samples you can lay your hands on are parsed successfully, and that as many error cases you can reasonably and economically find or create produce parsing errors. The former is a lot more important than the latter. Yu oh also he'd t check that the obvious things like operator precedence and if/else shift-reduce conflicts are handled correctly, via testing of whatever the output is.

issue in the generated parser with ANTLR 4.7.1

By : Michal
Date : March 29 2020, 07:55 AM
around this issue Look in your grammar. You have to identify the start rule you want to go with. Usually the start rule is near the top of the file and/or is one of the few (or only one) that is not called by any other rule.
Whatever rule you choose it will return a parse tree context, which forms the root of your parse tree, e.g.
code :
ParseTree tree = parser.start();

How do I use antlr generated parser and lexer?

By : Pranit Joshi
Date : March 29 2020, 07:55 AM
To fix this issue If you're going to venture further, I recommend The Definitive Antlr 4 Reference. From the Antlr documentation, you can download/see some sample code, including this:
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