Parse String into an object in Swift












0














I have received this response from the server and I am sure there must be a more efficient way to convert it into an object.

I have the following response:



[
id=2997,rapidViewId=62,state=ACTIVE,name=Sprint7,startDate=2018-11-20T10:28:37.256Z,endDate=2018-11-30T10:28:00.000Z,completeDate=<null>,sequence=2992,goal=none
]


How do I convert it nicely into a well formed swift object in the simplest way?



Here is my attempt which gives me just the Sprint Value



if sprintJiraCustomField.count > 0 {
let stringOutput = sprintJiraCustomField.first?.stringValue // convert output to String
let name = stringOutput?.components(separatedBy: "name=") // get name section from string
let nameFieldRaw = name![1].components(separatedBy: ",") // split out to the comma
let nameValue = nameFieldRaw.first!
sprintDetail = nameValue// show name field
}









share|improve this question


















  • 3




    Horrible format. Blame the owner of the service and ask him to send something standardized like JSON. First separate the string by , then in a loop separate each item by = and insert the result as key/value into a [String:String] dictionary.
    – vadian
    Nov 21 '18 at 18:14












  • does the server provide any other output formats? This isn't one of the popular standards (json, yaml, csv, xml, etc.)
    – Alexander
    Nov 21 '18 at 18:14
















0














I have received this response from the server and I am sure there must be a more efficient way to convert it into an object.

I have the following response:



[
id=2997,rapidViewId=62,state=ACTIVE,name=Sprint7,startDate=2018-11-20T10:28:37.256Z,endDate=2018-11-30T10:28:00.000Z,completeDate=<null>,sequence=2992,goal=none
]


How do I convert it nicely into a well formed swift object in the simplest way?



Here is my attempt which gives me just the Sprint Value



if sprintJiraCustomField.count > 0 {
let stringOutput = sprintJiraCustomField.first?.stringValue // convert output to String
let name = stringOutput?.components(separatedBy: "name=") // get name section from string
let nameFieldRaw = name![1].components(separatedBy: ",") // split out to the comma
let nameValue = nameFieldRaw.first!
sprintDetail = nameValue// show name field
}









share|improve this question


















  • 3




    Horrible format. Blame the owner of the service and ask him to send something standardized like JSON. First separate the string by , then in a loop separate each item by = and insert the result as key/value into a [String:String] dictionary.
    – vadian
    Nov 21 '18 at 18:14












  • does the server provide any other output formats? This isn't one of the popular standards (json, yaml, csv, xml, etc.)
    – Alexander
    Nov 21 '18 at 18:14














0












0








0







I have received this response from the server and I am sure there must be a more efficient way to convert it into an object.

I have the following response:



[
id=2997,rapidViewId=62,state=ACTIVE,name=Sprint7,startDate=2018-11-20T10:28:37.256Z,endDate=2018-11-30T10:28:00.000Z,completeDate=<null>,sequence=2992,goal=none
]


How do I convert it nicely into a well formed swift object in the simplest way?



Here is my attempt which gives me just the Sprint Value



if sprintJiraCustomField.count > 0 {
let stringOutput = sprintJiraCustomField.first?.stringValue // convert output to String
let name = stringOutput?.components(separatedBy: "name=") // get name section from string
let nameFieldRaw = name![1].components(separatedBy: ",") // split out to the comma
let nameValue = nameFieldRaw.first!
sprintDetail = nameValue// show name field
}









share|improve this question













I have received this response from the server and I am sure there must be a more efficient way to convert it into an object.

I have the following response:



[
id=2997,rapidViewId=62,state=ACTIVE,name=Sprint7,startDate=2018-11-20T10:28:37.256Z,endDate=2018-11-30T10:28:00.000Z,completeDate=<null>,sequence=2992,goal=none
]


How do I convert it nicely into a well formed swift object in the simplest way?



Here is my attempt which gives me just the Sprint Value



if sprintJiraCustomField.count > 0 {
let stringOutput = sprintJiraCustomField.first?.stringValue // convert output to String
let name = stringOutput?.components(separatedBy: "name=") // get name section from string
let nameFieldRaw = name![1].components(separatedBy: ",") // split out to the comma
let nameValue = nameFieldRaw.first!
sprintDetail = nameValue// show name field
}






swift






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 21 '18 at 17:35









Mobile Bloke

3,31962646




3,31962646








  • 3




    Horrible format. Blame the owner of the service and ask him to send something standardized like JSON. First separate the string by , then in a loop separate each item by = and insert the result as key/value into a [String:String] dictionary.
    – vadian
    Nov 21 '18 at 18:14












  • does the server provide any other output formats? This isn't one of the popular standards (json, yaml, csv, xml, etc.)
    – Alexander
    Nov 21 '18 at 18:14














  • 3




    Horrible format. Blame the owner of the service and ask him to send something standardized like JSON. First separate the string by , then in a loop separate each item by = and insert the result as key/value into a [String:String] dictionary.
    – vadian
    Nov 21 '18 at 18:14












  • does the server provide any other output formats? This isn't one of the popular standards (json, yaml, csv, xml, etc.)
    – Alexander
    Nov 21 '18 at 18:14








3




3




Horrible format. Blame the owner of the service and ask him to send something standardized like JSON. First separate the string by , then in a loop separate each item by = and insert the result as key/value into a [String:String] dictionary.
– vadian
Nov 21 '18 at 18:14






Horrible format. Blame the owner of the service and ask him to send something standardized like JSON. First separate the string by , then in a loop separate each item by = and insert the result as key/value into a [String:String] dictionary.
– vadian
Nov 21 '18 at 18:14














does the server provide any other output formats? This isn't one of the popular standards (json, yaml, csv, xml, etc.)
– Alexander
Nov 21 '18 at 18:14




does the server provide any other output formats? This isn't one of the popular standards (json, yaml, csv, xml, etc.)
– Alexander
Nov 21 '18 at 18:14












3 Answers
3






active

oldest

votes


















1














Not sure what format you want but the below code will produce an array of tuples (key, value) but all values are strings so I guess another conversion is needed afterwards



let items = stringOutput.components(separatedBy: ",").compactMap( {pair -> (String, String) in
let keyValue = pair.components(separatedBy: "=")
return (keyValue[0], keyValue[1])
})





share|improve this answer





















  • Once you have this, the rest is easy. Good answer.
    – Mike Taverne
    Nov 22 '18 at 3:14



















0














This is a work for reduce:



let keyValueStrings = yourString.components(separatedBy: ",")

let dictionary = keyValueStrings.reduce([String: String]()) {
(var aggregate: [String: String], element: String) -> [String: String] in

let elements = element.componentsSeparatedByString("=")
let key = elements[0]

// replace nil with the value you want to use if there is no value
let value = (elements.count > 1) ? elements[1] : nil
aggregate[key] = value

return aggregate
}


This is a functional approach, but you can achieve the same using a for iteration.
So then you can use Swift’s basic way of mapping. for example you will have your custom object struct. First, you will add an init method to it. Then map your object like this:



init(with dictionary: [String: Any]?) {
guard let dictionary = dictionary else { return }
attribute = dictionary["attrName"] as? String
}

let customObjec = CustomStruct(dictionary: dictionary)





share|improve this answer





























    0














    We already have some suggestion to first split the string at each comma and then split each part at the equals sign. This is rather easy to code and works well, but it is not very efficient as every character has to be checked multiple times. Writing a proper parser using Scanner is just as easy, but will run faster.



    Basically the scanner can check if a given string is at the current position or give you the substring up to the next occurrence of a separator.



    With that the algorithm would have the following steps:




    1. Create scanner with the input string

    2. Check for the opening bracket, otherwise fail

    3. Scan up to the first =. This is the key

    4. Consume the =

    5. Scan up to the first , or ]. This is the value

    6. Store the key/value pair

    7. If there is a , consume it and continue with step 3

    8. Consume the final ].


    Sadly the Scanner API is not very Swift-friendly. With a small extension it is much easier to use:



    extension Scanner {
    func scanString(_ string: String) -> Bool {
    return scanString(string, into: nil)
    }

    func scanUpTo(_ delimiter: String) -> String? {
    var result: NSString? = nil
    guard scanUpTo(delimiter, into: &result) else { return nil }
    return result as String?
    }

    func scanUpTo(_ characters: CharacterSet) -> String? {
    var result: NSString? = nil
    guard scanUpToCharacters(from: characters, into: &result) else { return nil }
    return result as String?
    }
    }


    With this we can write the parse function like this:



    func parse(_ list: String) -> [String: String]? {
    let scanner = Scanner(string: list)

    guard scanner.scanString("[") else { return nil }

    var result: [String: String] = [:]

    let endOfPair: CharacterSet = [",", "]"]
    repeat {
    guard
    let key = scanner.scanUpTo("="),
    scanner.scanString("="),
    let value = scanner.scanUpTo(endOfPair)
    else {
    return nil
    }

    result[key] = value
    } while scanner.scanString(",")

    guard scanner.scanString("]") else { return nil }

    return result
    }





    share|improve this answer





















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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      1














      Not sure what format you want but the below code will produce an array of tuples (key, value) but all values are strings so I guess another conversion is needed afterwards



      let items = stringOutput.components(separatedBy: ",").compactMap( {pair -> (String, String) in
      let keyValue = pair.components(separatedBy: "=")
      return (keyValue[0], keyValue[1])
      })





      share|improve this answer





















      • Once you have this, the rest is easy. Good answer.
        – Mike Taverne
        Nov 22 '18 at 3:14
















      1














      Not sure what format you want but the below code will produce an array of tuples (key, value) but all values are strings so I guess another conversion is needed afterwards



      let items = stringOutput.components(separatedBy: ",").compactMap( {pair -> (String, String) in
      let keyValue = pair.components(separatedBy: "=")
      return (keyValue[0], keyValue[1])
      })





      share|improve this answer





















      • Once you have this, the rest is easy. Good answer.
        – Mike Taverne
        Nov 22 '18 at 3:14














      1












      1








      1






      Not sure what format you want but the below code will produce an array of tuples (key, value) but all values are strings so I guess another conversion is needed afterwards



      let items = stringOutput.components(separatedBy: ",").compactMap( {pair -> (String, String) in
      let keyValue = pair.components(separatedBy: "=")
      return (keyValue[0], keyValue[1])
      })





      share|improve this answer












      Not sure what format you want but the below code will produce an array of tuples (key, value) but all values are strings so I guess another conversion is needed afterwards



      let items = stringOutput.components(separatedBy: ",").compactMap( {pair -> (String, String) in
      let keyValue = pair.components(separatedBy: "=")
      return (keyValue[0], keyValue[1])
      })






      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Nov 21 '18 at 18:36









      Joakim Danielson

      7,1173624




      7,1173624












      • Once you have this, the rest is easy. Good answer.
        – Mike Taverne
        Nov 22 '18 at 3:14


















      • Once you have this, the rest is easy. Good answer.
        – Mike Taverne
        Nov 22 '18 at 3:14
















      Once you have this, the rest is easy. Good answer.
      – Mike Taverne
      Nov 22 '18 at 3:14




      Once you have this, the rest is easy. Good answer.
      – Mike Taverne
      Nov 22 '18 at 3:14













      0














      This is a work for reduce:



      let keyValueStrings = yourString.components(separatedBy: ",")

      let dictionary = keyValueStrings.reduce([String: String]()) {
      (var aggregate: [String: String], element: String) -> [String: String] in

      let elements = element.componentsSeparatedByString("=")
      let key = elements[0]

      // replace nil with the value you want to use if there is no value
      let value = (elements.count > 1) ? elements[1] : nil
      aggregate[key] = value

      return aggregate
      }


      This is a functional approach, but you can achieve the same using a for iteration.
      So then you can use Swift’s basic way of mapping. for example you will have your custom object struct. First, you will add an init method to it. Then map your object like this:



      init(with dictionary: [String: Any]?) {
      guard let dictionary = dictionary else { return }
      attribute = dictionary["attrName"] as? String
      }

      let customObjec = CustomStruct(dictionary: dictionary)





      share|improve this answer


























        0














        This is a work for reduce:



        let keyValueStrings = yourString.components(separatedBy: ",")

        let dictionary = keyValueStrings.reduce([String: String]()) {
        (var aggregate: [String: String], element: String) -> [String: String] in

        let elements = element.componentsSeparatedByString("=")
        let key = elements[0]

        // replace nil with the value you want to use if there is no value
        let value = (elements.count > 1) ? elements[1] : nil
        aggregate[key] = value

        return aggregate
        }


        This is a functional approach, but you can achieve the same using a for iteration.
        So then you can use Swift’s basic way of mapping. for example you will have your custom object struct. First, you will add an init method to it. Then map your object like this:



        init(with dictionary: [String: Any]?) {
        guard let dictionary = dictionary else { return }
        attribute = dictionary["attrName"] as? String
        }

        let customObjec = CustomStruct(dictionary: dictionary)





        share|improve this answer
























          0












          0








          0






          This is a work for reduce:



          let keyValueStrings = yourString.components(separatedBy: ",")

          let dictionary = keyValueStrings.reduce([String: String]()) {
          (var aggregate: [String: String], element: String) -> [String: String] in

          let elements = element.componentsSeparatedByString("=")
          let key = elements[0]

          // replace nil with the value you want to use if there is no value
          let value = (elements.count > 1) ? elements[1] : nil
          aggregate[key] = value

          return aggregate
          }


          This is a functional approach, but you can achieve the same using a for iteration.
          So then you can use Swift’s basic way of mapping. for example you will have your custom object struct. First, you will add an init method to it. Then map your object like this:



          init(with dictionary: [String: Any]?) {
          guard let dictionary = dictionary else { return }
          attribute = dictionary["attrName"] as? String
          }

          let customObjec = CustomStruct(dictionary: dictionary)





          share|improve this answer












          This is a work for reduce:



          let keyValueStrings = yourString.components(separatedBy: ",")

          let dictionary = keyValueStrings.reduce([String: String]()) {
          (var aggregate: [String: String], element: String) -> [String: String] in

          let elements = element.componentsSeparatedByString("=")
          let key = elements[0]

          // replace nil with the value you want to use if there is no value
          let value = (elements.count > 1) ? elements[1] : nil
          aggregate[key] = value

          return aggregate
          }


          This is a functional approach, but you can achieve the same using a for iteration.
          So then you can use Swift’s basic way of mapping. for example you will have your custom object struct. First, you will add an init method to it. Then map your object like this:



          init(with dictionary: [String: Any]?) {
          guard let dictionary = dictionary else { return }
          attribute = dictionary["attrName"] as? String
          }

          let customObjec = CustomStruct(dictionary: dictionary)






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 21 '18 at 19:09









          Abdel

          362




          362























              0














              We already have some suggestion to first split the string at each comma and then split each part at the equals sign. This is rather easy to code and works well, but it is not very efficient as every character has to be checked multiple times. Writing a proper parser using Scanner is just as easy, but will run faster.



              Basically the scanner can check if a given string is at the current position or give you the substring up to the next occurrence of a separator.



              With that the algorithm would have the following steps:




              1. Create scanner with the input string

              2. Check for the opening bracket, otherwise fail

              3. Scan up to the first =. This is the key

              4. Consume the =

              5. Scan up to the first , or ]. This is the value

              6. Store the key/value pair

              7. If there is a , consume it and continue with step 3

              8. Consume the final ].


              Sadly the Scanner API is not very Swift-friendly. With a small extension it is much easier to use:



              extension Scanner {
              func scanString(_ string: String) -> Bool {
              return scanString(string, into: nil)
              }

              func scanUpTo(_ delimiter: String) -> String? {
              var result: NSString? = nil
              guard scanUpTo(delimiter, into: &result) else { return nil }
              return result as String?
              }

              func scanUpTo(_ characters: CharacterSet) -> String? {
              var result: NSString? = nil
              guard scanUpToCharacters(from: characters, into: &result) else { return nil }
              return result as String?
              }
              }


              With this we can write the parse function like this:



              func parse(_ list: String) -> [String: String]? {
              let scanner = Scanner(string: list)

              guard scanner.scanString("[") else { return nil }

              var result: [String: String] = [:]

              let endOfPair: CharacterSet = [",", "]"]
              repeat {
              guard
              let key = scanner.scanUpTo("="),
              scanner.scanString("="),
              let value = scanner.scanUpTo(endOfPair)
              else {
              return nil
              }

              result[key] = value
              } while scanner.scanString(",")

              guard scanner.scanString("]") else { return nil }

              return result
              }





              share|improve this answer


























                0














                We already have some suggestion to first split the string at each comma and then split each part at the equals sign. This is rather easy to code and works well, but it is not very efficient as every character has to be checked multiple times. Writing a proper parser using Scanner is just as easy, but will run faster.



                Basically the scanner can check if a given string is at the current position or give you the substring up to the next occurrence of a separator.



                With that the algorithm would have the following steps:




                1. Create scanner with the input string

                2. Check for the opening bracket, otherwise fail

                3. Scan up to the first =. This is the key

                4. Consume the =

                5. Scan up to the first , or ]. This is the value

                6. Store the key/value pair

                7. If there is a , consume it and continue with step 3

                8. Consume the final ].


                Sadly the Scanner API is not very Swift-friendly. With a small extension it is much easier to use:



                extension Scanner {
                func scanString(_ string: String) -> Bool {
                return scanString(string, into: nil)
                }

                func scanUpTo(_ delimiter: String) -> String? {
                var result: NSString? = nil
                guard scanUpTo(delimiter, into: &result) else { return nil }
                return result as String?
                }

                func scanUpTo(_ characters: CharacterSet) -> String? {
                var result: NSString? = nil
                guard scanUpToCharacters(from: characters, into: &result) else { return nil }
                return result as String?
                }
                }


                With this we can write the parse function like this:



                func parse(_ list: String) -> [String: String]? {
                let scanner = Scanner(string: list)

                guard scanner.scanString("[") else { return nil }

                var result: [String: String] = [:]

                let endOfPair: CharacterSet = [",", "]"]
                repeat {
                guard
                let key = scanner.scanUpTo("="),
                scanner.scanString("="),
                let value = scanner.scanUpTo(endOfPair)
                else {
                return nil
                }

                result[key] = value
                } while scanner.scanString(",")

                guard scanner.scanString("]") else { return nil }

                return result
                }





                share|improve this answer
























                  0












                  0








                  0






                  We already have some suggestion to first split the string at each comma and then split each part at the equals sign. This is rather easy to code and works well, but it is not very efficient as every character has to be checked multiple times. Writing a proper parser using Scanner is just as easy, but will run faster.



                  Basically the scanner can check if a given string is at the current position or give you the substring up to the next occurrence of a separator.



                  With that the algorithm would have the following steps:




                  1. Create scanner with the input string

                  2. Check for the opening bracket, otherwise fail

                  3. Scan up to the first =. This is the key

                  4. Consume the =

                  5. Scan up to the first , or ]. This is the value

                  6. Store the key/value pair

                  7. If there is a , consume it and continue with step 3

                  8. Consume the final ].


                  Sadly the Scanner API is not very Swift-friendly. With a small extension it is much easier to use:



                  extension Scanner {
                  func scanString(_ string: String) -> Bool {
                  return scanString(string, into: nil)
                  }

                  func scanUpTo(_ delimiter: String) -> String? {
                  var result: NSString? = nil
                  guard scanUpTo(delimiter, into: &result) else { return nil }
                  return result as String?
                  }

                  func scanUpTo(_ characters: CharacterSet) -> String? {
                  var result: NSString? = nil
                  guard scanUpToCharacters(from: characters, into: &result) else { return nil }
                  return result as String?
                  }
                  }


                  With this we can write the parse function like this:



                  func parse(_ list: String) -> [String: String]? {
                  let scanner = Scanner(string: list)

                  guard scanner.scanString("[") else { return nil }

                  var result: [String: String] = [:]

                  let endOfPair: CharacterSet = [",", "]"]
                  repeat {
                  guard
                  let key = scanner.scanUpTo("="),
                  scanner.scanString("="),
                  let value = scanner.scanUpTo(endOfPair)
                  else {
                  return nil
                  }

                  result[key] = value
                  } while scanner.scanString(",")

                  guard scanner.scanString("]") else { return nil }

                  return result
                  }





                  share|improve this answer












                  We already have some suggestion to first split the string at each comma and then split each part at the equals sign. This is rather easy to code and works well, but it is not very efficient as every character has to be checked multiple times. Writing a proper parser using Scanner is just as easy, but will run faster.



                  Basically the scanner can check if a given string is at the current position or give you the substring up to the next occurrence of a separator.



                  With that the algorithm would have the following steps:




                  1. Create scanner with the input string

                  2. Check for the opening bracket, otherwise fail

                  3. Scan up to the first =. This is the key

                  4. Consume the =

                  5. Scan up to the first , or ]. This is the value

                  6. Store the key/value pair

                  7. If there is a , consume it and continue with step 3

                  8. Consume the final ].


                  Sadly the Scanner API is not very Swift-friendly. With a small extension it is much easier to use:



                  extension Scanner {
                  func scanString(_ string: String) -> Bool {
                  return scanString(string, into: nil)
                  }

                  func scanUpTo(_ delimiter: String) -> String? {
                  var result: NSString? = nil
                  guard scanUpTo(delimiter, into: &result) else { return nil }
                  return result as String?
                  }

                  func scanUpTo(_ characters: CharacterSet) -> String? {
                  var result: NSString? = nil
                  guard scanUpToCharacters(from: characters, into: &result) else { return nil }
                  return result as String?
                  }
                  }


                  With this we can write the parse function like this:



                  func parse(_ list: String) -> [String: String]? {
                  let scanner = Scanner(string: list)

                  guard scanner.scanString("[") else { return nil }

                  var result: [String: String] = [:]

                  let endOfPair: CharacterSet = [",", "]"]
                  repeat {
                  guard
                  let key = scanner.scanUpTo("="),
                  scanner.scanString("="),
                  let value = scanner.scanUpTo(endOfPair)
                  else {
                  return nil
                  }

                  result[key] = value
                  } while scanner.scanString(",")

                  guard scanner.scanString("]") else { return nil }

                  return result
                  }






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                  answered Nov 21 '18 at 20:54









                  Sven

                  20.3k44567




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