<assoc=right> is not working

[Hunter Blakely]

The attached picture shows that even when I assign right association to '^' I am getting a left association.

Here is my sample grammer:

grammar testParser;

program

        : expr* EOF

        ;

expr

        : expr '^'<assoc=right> expr    // ^ operator is right associative

        | expr '*' expr                 // match subexpressions joined with '*' operator

        | expr '+' expr                 // match subexpressions joined with '+' operator

        | INT                           // matches simple integer atom

        ;

INT

        : [0-9]+

        ;

WS

        : [ \n\t\r]+ -> skip

        ;

My input:

1^2^3

What the parser sees:

    (1^2)^3

What I want the parser to see:

1^(2^3)

How do I get my intended output?

The attached picture shows my exact code, input, and output.

I apologize if I have made a glaring mistake, and I appreciate your input.

[Hunter Blakely]

I forgot to mention the version of ANTLR4:

Tiggerlocal:testRight hblakely$ brew info antlr

antlr: stable 4.2

http://www.antlr.org/

/usr/local/Cellar/antlr/4.2 (3 files, 1.2M) *

  Built from source

From: https://github.com/Homebrew/homebrew/commits/master/Library/Formula/antlr.rb

ANTLR Parser Generator Version 4.2

[Jonathan Coveney]

Seems like they changed the syntax, though it should give a warning

https://github.com/antlr/antlr4/issues/488

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[Hunter Blakely]

Thank you for your post, the following worked: <assoc=right> expr '^' expr;

The reason I was so confused is because I was directly quoting the ANTLR4 book on page 70 which I had purchased thinking it would be up to date.

 

[Jonathan Coveney]

It's a fast moving project!

El jueves, 8 de mayo de 2014, Hunter Blakely <hunter.j...@gmail.com> escribió:

Thank you for your post, the following worked: <assoc=right> expr '^' expr;

The reason I was so confused is because I was directly quoting the ANTLR4 book on page 70 which I had purchased thinking it would be up to date.

 

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[Terence Parr]

hi. you should be getting a warning…are you not? weird.
Ter