[SR-5742] Refactoring action to convert imperative code to functional style

[akyrtzi]

Previous ID	SR-5742
Radar	rdar://32751280
Original Reporter	@akyrtzi
Type	New Feature

Additional Detail from JIRA

Votes	1
Component/s	Source Tooling
Labels	New Feature, Refactoring, StarterProposal
Assignee	kacperh (JIRA)
Priority	Medium

md5: d8dd54b6f1cfe6d2981c48e99ab5db6d

Issue Description:

Implement action to change code such as this:

func foo(list : [String]) {
  var result = [String]()

  for element in list {
    if !element.isEmpty {
      result.append(element)
    }
  }
}

to

func foo(list : [String]) {
  var result = list.filter { !$0.isEmpty }
}

[swift-ci]

Comment by KacperHarasim (JIRA)

@nkcsgexi I'll take a look into this. Will partially implement detection of 3 patterns as part of this task: mapping, filtering and reducing. Started thinking about refactoring type and I see this as a range based refactoring. To make it happen user has to select variable initialization and the for loop, together. I believe we don't have one token that should be a base for cursor refactoring, hence my choosing of range refactor. Do you think it makes sense?