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From "Daniel Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GROOVY-8913) Parrot Parser: partially-parenthesized binary expression parsed as cast and unary plus
Date Mon, 10 Dec 2018 18:22:00 GMT

    [ https://issues.apache.org/jira/browse/GROOVY-8913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16715296#comment-16715296
] 

Daniel Sun commented on GROOVY-8913:
------------------------------------

FYI, https://github.com/tunnelvisionlabs/antlr4/issues/37


> Parrot Parser: partially-parenthesized binary expression parsed as cast and unary plus
> --------------------------------------------------------------------------------------
>
>                 Key: GROOVY-8913
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8913
>             Project: Groovy
>          Issue Type: Bug
>          Components: parser-antlr4
>    Affects Versions: 2.6.0-alpha-4
>            Reporter: Eric Milles
>            Assignee: Daniel Sun
>            Priority: Major
>
> Groovy 2.6 (and possibly/probably 3.0) is parsing this expression differently from 2.5:
> {code:groovy}
> def x = (a.b) + c()
> {code}
> In Groovy 2.5, this is a DeclarationExpression with a VariableExpression for the left
expression and a BinaryExpression (with PLUS operator) for the right expression.  Parrot Parser
is seeing the right expression as a CastExpression with a UnaryPlusExpression.



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