feat: add swift indents (#4756)

tests/indent/swift/declarations.swift

@@ -0,0 +1,51 @@
+@wrapper
+@modifier(
+  *
+)
+class EquilateralTriangle: NamedShape {
+  var sideLength: Double = 0.0
+
+  @attr
+  init(
+    sideLength: Double, 
+    name: String
+  ) {
+    self.sideLength = sideLength
+  }
+
+  var perimeter: Double {
+    willSet {
+    }
+  }
+
+  @funcattr
+  override func simpleDescription(a: int, b: int) -> String {
+    return "An equilateral triangle with sides of length \(sideLength)."
+  }
+}
+
+@attr
+protocol ExampleProtocol {
+  var simpleDescription: String { get }
+  mutating func adjust()
+}
+
+@available(*)
+func test() {
+
+}
+
+@attr(*)
+typealias Foo = Bar
+
+@attr
+struct Foo<
+  Bar
+> {
+  @Provider
+  var test = 1
+
+  subscript(index: Int) -> Int {
+    var foo = 2
+  }
+}

tests/indent/swift/expressions.swift

@@ -0,0 +1,17 @@
+func Test() {
+  (1 + 2)
+
+  [
+    1,
+    2,
+    3,
+    4,
+    5
+  ].split()
+
+  let x = [
+    1: 2,
+    3: 4,
+  ]
+
+}

tests/indent/swift/statements.swift

@@ -0,0 +1,34 @@
+func Test() {
+  if true {
+    return
+  } else if true {
+    return
+  }
+
+  switch x {
+  case "1":
+    print("x")
+  default:
+    print("y")
+  @unknown default:
+    print("z")
+  }
+
+  for a in b {
+  }
+
+  while true{
+  }
+
+  repeat {
+
+  } while (true)
+
+  guard let name = person["name"] else {
+    return
+  }
+
+  return (
+    x + 1
+  )
+}

tests/indent/swift_spec.lua

@@ -0,0 +1,21 @@
+local Runner = require("tests.indent.common").Runner
+
+local run = Runner:new(it, "tests/indent/swift", {
+  tabstop = 2,
+  shiftwidth = 2,
+  softtabstop = 2,
+  expandtab = true,
+})
+
+describe("indent Swift:", function()
+  describe("whole file:", function()
+    run:whole_file(".", {})
+  end)
+  describe("new line:", function()
+    run:new_line("declarations.swift", { on_line = 6, text = "var x = 1", indent = 2 })
+    run:new_line("declarations.swift", { on_line = 12, text = "var textInsideInit = true", indent = 4 })
+    run:new_line("declarations.swift", { on_line = 17, text = "var textInsideWillSet = 1", indent = 6 })
+    run:new_line("declarations.swift", { on_line = 22, text = "var textInsideOverrideFunc", indent = 4 })
+    run:new_line("declarations.swift", { on_line = 28, text = "var InsideProtocol: String { get }", indent = 2 })
+  end)
+end)