CommonCoding

Common Swift Encoder/Decoder

Binary Codings

Encoder and decoder for binary file format. For format specification, see Format

Note: We have not reached 1.0 yet, and so the format for these coders may change in incompatible ways over time.

CSV Codings

Encoder and decoder for CSV file format as per RFC 4180. For API information, see CSV README.

A decoding example,

import LNTCSVCoding

struct SomeStruct: Equatable, Codable {
  var a: Int, b: Double?, c: String
}

let decoder = CSVDecoder() // default options

let string = """
a,b,c
4,,test
6,9.9,ss
"""

let values = try decoder.decode(SomeStruct.self, from: string)
/* 
values = [
  SomeStruct(a: 4, b: nil, c: "test"), // first row
  SomeStruct(a: 6, b: 9.9, c: "ss") // second row
]
 */

An encoding example,

import LNTCSVCoding

struct SomeStruct: Equatable, Codable {
  var a: Int, b: Double?, c: String
}
struct OtherStruct: Equatable, Codable {
  var a: Float?, b: SomeStruct 
}

let values = [
  OtherStruct(a: 5.5, b: .init(a: 4.4, b: 1, c: "abc")),
  OtherStruct(a: nil, b: .init(a: .infinity, b: nil, c: ""))
]

let encoder = CSVEncoder() // default options
let string = encoder.encode(values)
/*
string = """ 
  float,some.a,some.b,some.c
  5.5,4,inf,abc
  ,-3,,
  """
 */

Note that both times the Swift data is a sequence of values. This is due to tabular nature of CSV.