Fixed array path in json logic rule

[alexchornyi]

fixed to parsing rule array with index like "payload.r.0.fr"

[codecov-commenter]

Codecov Report

Merging #16 (af00117) into master (a4d6647) will decrease coverage by 0.02%. The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   98.32%   98.30%   -0.03%     
==========================================
  Files          31       31              
  Lines        3282     3298      +16     
==========================================
+ Hits         3227     3242      +15     
- Misses         55       56       +1     

Impacted Files	Coverage Δ
Sources/jsonlogic/Parser.swift	95.36% <90.90%> (-0.18%)	:arrow_down:
...cTests/AccessingDataOperations/ArrayMapTests.swift	100.00% <100.00%> (ø)

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[csknns]

Hello @alexchornyi Thanks for your contribution!

If I understand this correctly you add support for using array index as part of the keypath string for accessing the data So the rule { "var" : "person.name.1" }

applied to { "person" : { "name" : ["John", "Green"] } }

will produce "Green"

I had missed this capability in the original implementation.

Can you also add a unit test for this? something like

    func testAccessingVariableWithArrayIndexPath() {
        let rule =
        """
           { "var" : "person.name.1" }
        """
        let data =
        """
           { "person" : { "name" : ["John", "Green"] } }
        """

        XCTAssertEqual("John", try applyRule(rule, to: data))
    }