Add configuration for setting escaping strategy

Author: josh

Sources/Active/Writer/WriterConfiguration.swift

@@ -3,6 +3,8 @@ extension CSVWriter {
     public struct Configuration {
         /// The field and row delimiters.
         public var delimiters: Delimiter.Pair
+        /// The strategy for escaping quoted fields.
+        public var escapingStrategy: Strategy.Escaping
         /// The row of headers to write at the beginning of the CSV data.
         ///
         /// If empty, no row will be written.
@@ -19,6 +21,7 @@ extension CSVWriter {
         /// Designated initlaizer setting the default values.
         public init() {
             self.delimiters = (field: ",", row: "\n")
+            self.escapingStrategy = .doubleQuote
             self.headers = .init()
             self.encoding = nil
             self.bomStrategy = .convention
@@ -53,7 +56,7 @@ extension CSVWriter {
         /// Boolean indicating whether the received CSV contains a header row or not.
         let headers: [String]
         /// The unicode scalar used as encapsulator and escaping character (when printed two times).
-        let escapingScalar: Unicode.Scalar? = "\""
+        let escapingScalar: Unicode.Scalar?
         /// The encoding used to identify the underlying data.
         let encoding: String.Encoding
 
@@ -71,6 +74,7 @@ extension CSVWriter {
                 self.delimiters = (.init(field), .init(row))
             }
             // 2. Copy all other values.
+            self.escapingScalar = configuration.escapingStrategy.scalar
             self.headers = configuration.headers
             self.encoding = encoding
         }

Tests/CodableCSVTests/ActiveTests/WriterTests.swift

@@ -49,6 +49,7 @@ extension WriterTests {
         // The configuration values to be tested.
         let rowDelimiters: [Delimiter.Row] = ["\n", "\r", "\r\n", "**~**"]
         let fieldDelimiters: [Delimiter.Field] = [",", ";", "\t", "|", "||", "|-|"]
+        let escapingStrategy: [Strategy.Escaping] = [.none, .doubleQuote]
         let encodings: [String.Encoding] = [.utf8, .utf16LittleEndian, .utf16BigEndian, .utf16LittleEndian, .utf32BigEndian]
         // The data used for testing.
         let headers = TestData.headers
@@ -69,13 +70,16 @@ extension WriterTests {
                 let pair: Delimiter.Pair = (f, r)
                 let sample = TestData.toCSV(input, delimiters: pair)
 
-                for encoding in encodings {
-                    var c = CSVWriter.Configuration()
-                    c.delimiters = pair
-                    c.headers = headers
-                    c.encoding = encoding
-                    c.bomStrategy = .never
-                    try work(c, sample)
+                for escaping in escapingStrategy {
+                    for encoding in encodings {
+                        var c = CSVWriter.Configuration()
+                        c.delimiters = pair
+                        c.escapingStrategy = escaping
+                        c.headers = headers
+                        c.encoding = encoding
+                        c.bomStrategy = .never
+                        try work(c, sample)
+                    }
                 }
             }
         }