Support script expressions about jsonsurfer HOT 6 CLOSED

Which JsonPath spec? Can you provide a sample json and the expected result of your example?

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http://goessner.net/articles/JsonPath/

"Script expression evaluated by the underlying script engine"

For example the jayway implementation allows some functions, min, max, etc.

https://github.com/json-path/JsonPath#functions

Ideally this would need to be an addition to the antlr grammar to allow pluggable functions that could be defined in the JsonSurfer instance

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{
"items": [1,2,3,-1]
}

$.items.size() // 4
$.items.min() // -1
$.items.toString() // "[1,2,3,-1]"

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I think it would not be too difficult if the "functions" apply only to leaf level(as the last node), then the implementation should be similar to JsonPath filter. Any pull requests for this feature are welcome. I'd love to help, if you have any further question.

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Alternatively, you can use stream API of Java8 to achieve above "functions". Please refer to https://github.com/jsurfer/JsonSurfer#stream-support

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Examples added in document:
https://github.com/jsurfer/JsonSurfer#java-8-streams-api-support

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