An ugly and quick attempt to convert SnapKit to native NSLayoutConstraint

gistfile1.swift

import Foundation


let s = """
aview.snp.makeConstraints { (make) -> Void in
      make.centerX.equalTo(view.snp.centerX)
      make.bottom.equalTo(anotherview.snp.top).offset(-10)
      make.height.equalTo(40)
      make.width.equalTo(view.snp.width)
    }
"""

let object = String(s.split(separator: ".").first!)

let lines = s.split(separator: "\n")

print("NSLayoutConstraint.activate([")
for i in 1 ..< lines.count - 1 {
  let line = lines[i]
  var newLine = String(line)
  newLine = newLine.replacingOccurrences(of: "make.", with: "\(object).")
  newLine = newLine.replacingOccurrences(of: ".snp.", with: ".")
  newLine = newLine.replacingOccurrences(of: ".width.equalTo(", with: ".widthAnchor.constraint(equalToConstant: ")
  newLine = newLine.replacingOccurrences(of: ".height.equalTo(", with: ".heightAnchor.constraint(equalToConstant: ")
  newLine = newLine.replacingOccurrences(of: ".lessThanOrEqualTo(", with: ".constraint(lessThanOrEqualTo: ")
  newLine = newLine.replacingOccurrences(of: ".width.", with: ".widthAnchor.")
  newLine = newLine.replacingOccurrences(of: ".height.", with: ".heightAnchor.")
  newLine = newLine.replacingOccurrences(of: ".width,", with: ".widthAnchor,")
  newLine = newLine.replacingOccurrences(of: ".height,", with: ".heightAnchor,")
  newLine = newLine.replacingOccurrences(of: ".width)", with: ".widthAnchor)")
  newLine = newLine.replacingOccurrences(of: ".height)", with: ".heightAnchor)")
  newLine = newLine.replacingOccurrences(of: ".centerX", with: ".centerXAnchor")
  newLine = newLine.replacingOccurrences(of: ".centerY", with: ".centerYAnchor")
  newLine = newLine.replacingOccurrences(of: ".top", with: ".topAnchor")
  newLine = newLine.replacingOccurrences(of: ".bottom", with: ".bottomAnchor")
  newLine = newLine.replacingOccurrences(of: ".left", with: ".leadingAnchor")
  newLine = newLine.replacingOccurrences(of: ".right", with: ".trailingAnchor")
  newLine = newLine.replacingOccurrences(of: ".equalTo(", with: ".constraint(equalTo: ")
  newLine = newLine.replacingOccurrences(of: ").offset(", with: ", constant: ")

  newLine = newLine.replacingOccurrences(of: ".edges.constraint(equalTo: self)", with:
  """
  .topAnchor.constraint(equalTo: topAnchor),
  \(object).leadingAnchor.constraint(equalTo: leadingAnchor),
  \(object).bottomAnchor.constraint(equalTo: bottomAnchor),
  \(object).trailingAnchor.constraint(equalTo: trailingAnchor)
  """
  )

  newLine = newLine.replacingOccurrences(of: ".edges.constraint(equalTo: super.view)", with:
                                          """
  .topAnchor.constraint(equalTo: view.topAnchor),
  \(object).leadingAnchor.constraint(equalTo: view.leadingAnchor),
  \(object).bottomAnchor.constraint(equalTo: view.bottomAnchor),
  \(object).trailingAnchor.constraint(equalTo: view.trailingAnchor)
  """
  )

  newLine = newLine.replacingOccurrences(of: ".center.constraint(equalTo: self)", with:
                                          """
  .centerXAnchor.constraint(equalTo: centerXAnchor),
  \(object).centerYAnchor.constraint(equalTo: centerYAnchor)
  """
  )

  if newLine.contains(".widthAnchor.heightAnchor.") || newLine.contains(".heightAnchor.widthAnchor.") {
    var newLine1 = newLine
    var newLine2 = newLine
    newLine1 = newLine1.replacingOccurrences(of: ".heightAnchor.", with: ".")
    newLine2 = newLine2.replacingOccurrences(of: ".widthAnchor.", with: ".")
    newLine = newLine1 + ",\n" + newLine2
  }

  newLine += ","
  print(newLine)
}
print("])")