[jira] [Resolved] (LUCENE-5754) Allow "$" in expression variables

["Uwe Schindler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-5754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe Schindler resolved LUCENE-5754.
-----------------------------------

    Resolution: Fixed

> Allow "$" in expression variables
> ---------------------------------
>
>                 Key: LUCENE-5754
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5754
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/expressions
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 4.9, 5.0
>
>         Attachments: LUCENE-5754.patch, LUCENE-5754.patch
>
>
> The current expressions modules only allows ASCII letters, ASCII digits and the underscore in variable names.
> It is quite common to javascript developers to use also the dollar sign as identifier part (especially at the beginning of an identifier, see the famous "jQuery" $-function). This would allow bindings like "$score".
> The official ECMAScript spec allows the $: http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf (see section 7.6)
> The other stuff there like unicode escapes and all unicode letter crazyness should be excluded for simplicity.
> Adding the "$" is just a one-line change in the grammar and does not conflict with anything else, because "$" is not a special character to javascript.



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