Support for fuction call

[ng-galien]

It could be great if we can call function in RSQL queries.
This POC adresses this feature as function pattern is @function_name[arg1|arg2|...]
It support function imbrication and constant (null, boolean, number, string) in parameters.

Some expressions tested in the POC

@upper[code]==HELLO
@concat[code|name]=='TestTest Lab'
@concat[@upper[code]|name]=='TESTTest Lab'
@concat[@upper[code]|#WORLD]=='HELLOWORLD'

The main limitation is we cannot use white space in the query because of the parser.

If we feel confortable with this feature I will finish implementation with Sort and more tests

[perplexhub]

@ng-galien This is a very useful feature. Could it be disabled by default and turned on by setting a flag? Thanks.

[ng-galien]

@perplexhub
I've experienced this feature at work and, as you suggest, we have a mandatory whiteList and an optional blackList for the safety reason.
Procedure call is also supported for sorting.

[perplexhub]

@ng-galien Could you please help to resolve the conflicts and implement the remaining parts? Thanks

[ng-galien]

@perplexhub I can do it next week, then are we aligned with this feature spec

1. The function call syntax (with empty space restriction because of the RSQL parser)
2. Ability to use it for where and sort
3. Mandatory whitelist and optional blacklist with regex, supplied in both QuerySupport and SortSupport

Regarding the third point, we can use RSQLCommonSupport too and specialized supports as an override.

[perplexhub]

@ng-galien Thanks for your help. I agree with your spec.
About point 1, do you think we could provide an option to define a string pattern variable to mimic a space? The pattern would be replaced with space internally if the string pattern variable was set.

[ng-galien]

@perplexhub
I've just merged in order to pass basic tests, but code needs some refactoring as it's quite messy

[ng-galien]

@ng-galien Thanks for your help. I agree with your spec. About point 1, do you think we could provide an option to define a string pattern variable to mimic a space? The pattern would be replaced with space internally if the string pattern variable was set.

We can use tab as a replacement for a space.
See testFunctionStaticWhitespaceAsSpace in RSQLJPASupportTest