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Date: Tue, 18 Aug 2015 04:24:46 +0000 (UTC)
From: "Dilip Ramesh (JIRA)" <jira@apache.org>
To: pig-dev@hadoop.apache.org
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Subject: [jira] [Updated] (PIG-2597) Move grunt from javacc to ANTLR
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     [ https://issues.apache.org/jira/browse/PIG-2597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dilip Ramesh updated PIG-2597:
------------------------------
    Attachment: 18Aug.diff

I have been working on this for sometime now. Here is my first patch. I have written the grammar for these commands in ANTLR and have got JavaCC to forward it to ANTLR:
History
Set
Clear
Help
It ll be great if anyone can go through and comment on this.
Work ahead:
Get QueryParser to take take care of the remaining commands and relieve JavaCC of these commands. Hope to come up with another patch in the next two weeks.
Thank you [~daijy] for all the help.

> Move grunt from javacc to ANTLR
> -------------------------------
>
>                 Key: PIG-2597
>                 URL: https://issues.apache.org/jira/browse/PIG-2597
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Jonathan Coveney
>            Assignee: Daniel Dai
>              Labels: gsoc2014
>         Attachments: 18Aug.diff, current.08.11.2014.dot.diff, pig02.diff
>
>
> Currently, the parser for queries is in ANTLR, but Grunt is still javacc. The parser is very difficult to work with, and next to impossible to understand or modify. ANTLR provides a much cleaner, more standard way to generate parsers/lexers/ASTs/etc, and moving from javacc to Grunt would be huge as we continue to add features to Pig.
> This is a candidate project for Google summer of code 2014. More information about the program can be found at https://cwiki.apache.org/confluence/display/PIG/GSoc2014


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