Uwe Schindler created LUCENE-5754:
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Summary: 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
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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