CSV.swift

2.4.2

CSV reading and writing library written in Swift.
yaslab/CSV.swift

What's New

2.4.2

2019-07-13T07:14:21Z

This release targets Swift 5.0.x / Xcode 10.2.x.

Fixed

  • Fix a crash that occurs when the number of fields is small (#92). Thanks a72 for reporting this issue!
  • Fix CSV Deprecated compiler warning (#93). Thanks robwithhair for reporting this issue!

Breaking change

In 2.4.2 and later versions, If you specify a key that does not have a value in subscript, an empty string is returned. For example,

let csvString = "key1,key2\nvalue1" // There is only one field in the second line.
let csv = try! CSVReader(string: csvString, hasHeaderRow: true)
csv.next()
let value2 = csv["key2"] // Change point: Formerly nil, now "" is returned.
let value3 = csv["key3"] // In this case, nil will be returned.

CSV.swift

Build Status codecov Open Source Helpers

CSV reading and writing library written in Swift.

Usage for reading CSV

From string

import CSV

let csvString = "1,foo\n2,bar"
let csv = try! CSVReader(string: csvString)
while let row = csv.next() {
    print("\(row)")
}
// => ["1", "foo"]
// => ["2", "bar"]

From file

NOTE: The default character encoding is UTF8.

import Foundation
import CSV

let stream = InputStream(fileAtPath: "/path/to/file.csv")!
let csv = try! CSVReader(stream: stream)
while let row = csv.next() {
    print("\(row)")
}

Getting the header row

import CSV

let csvString = "id,name\n1,foo\n2,bar"
let csv = try! CSVReader(string: csvString,
                         hasHeaderRow: true) // It must be true.

let headerRow = csv.headerRow!
print("\(headerRow)") // => ["id", "name"]

while let row = csv.next() {
    print("\(row)")
}
// => ["1", "foo"]
// => ["2", "bar"]

Get the field value using subscript

import CSV

let csvString = "id,name\n1,foo"
let csv = try! CSVReader(string: csvString,
                         hasHeaderRow: true) // It must be true.

while csv.next() != nil {
    print("\(csv["id"]!)")   // => "1"
    print("\(csv["name"]!)") // => "foo"
}

Provide the character encoding

If you use a file path, you can provide the character encoding to initializer.

import Foundation
import CSV

let stream = InputStream(fileAtPath: "/path/to/file.csv")!
let csv = try! CSVReader(stream: stream,
                         codecType: UTF16.self,
                         endian: .big)

Reading a row into a Decodable object

If you have a destination object that conforms to the Decodable protocol, you can serialize a row with a new instances of the object.

struct DecodableExample: Decodable {
    let intKey: Int
    let stringKey: String
    let optionalStringKey: String?
}

let csv = """
    intKey,stringKey,optionalStringKey
    1234,abcd,
    """

var records = [DecodableExample]()
do {
    let reader = try CSVReader(string: csv, hasHeaderRow: true)
    let decoder = CSVRowDecoder()
    while reader.next() != nil {
        let row = try decoder.decode(DecodableExample.self, from: reader)
        records.append(row)
    }
} catch {
    // Invalid row format
}

Usage for writing CSV

Write to memory and get a CSV String

NOTE: The default character encoding is UTF8.

import Foundation
import CSV

let stream = OutputStream(toMemory: ())
let csv = try! CSVWriter(stream: stream)

// Write a row
try! csv.write(row: ["id", "name"])

// Write fields separately
csv.beginNewRow()
try! csv.write(field: "1")
try! csv.write(field: "foo")
csv.beginNewRow()
try! csv.write(field: "2")
try! csv.write(field: "bar")

csv.stream.close()

// Get a String
let csvData = stream.property(forKey: .dataWrittenToMemoryStreamKey) as! NSData
let csvString = String(data: Data(referencing: csvData), encoding: .utf8)!
print(csvString)
// => "id,name\n1,foo\n2,bar"

Write to file

NOTE: The default character encoding is UTF8.

import Foundation
import CSV

let stream = OutputStream(toFileAtPath: "/path/to/file.csv", append: false)!
let csv = try! CSVWriter(stream: stream)

try! csv.write(row: ["id", "name"])
try! csv.write(row: ["1", "foo"])
try! csv.write(row: ["1", "bar"])

csv.stream.close()

Installation

CocoaPods

pod 'CSV.swift', '~> 2.4.2'

Carthage

github "yaslab/CSV.swift" ~> 2.4.2

Swift Package Manager

.package(url: "https://github.com/yaslab/CSV.swift.git", .upToNextMinor(from: "2.4.2"))

Reference specification

License

CSV.swift is released under the MIT license. See the LICENSE file for more info.

Description

  • Swift Tools 5.0.0
View More Packages from this Author

Dependencies

  • None
Last updated: Fri Sep 30 2022 08:19:19 GMT-0500 (GMT-05:00)