Move escapeContent function.

Sources/Parma/ParmaCore.swift

@@ -62,40 +62,9 @@ class ParmaCore: NSObject {
     /// The context for element composing.
     let context = ComposingContext()
 
-    /// Sanitize input to prevent < and > from causing problems
-    private static func escapeContent(_ rawContent: String) -> String {
-
-        enum EscapedCharacters: String, CaseIterable {
-
-            case leftAngleBracket = "<",
-                 rightAngleBracket = ">"
-
-            func replacement() -> String {
-                switch self {
-                case .leftAngleBracket:
-                    return "&lt;"
-                case .rightAngleBracket:
-                    return "&gt;"
-                }
-            }
-
-            static func escapeString(_ string: String) -> String {
-                var escapedValue = string
-
-                self.allCases.forEach {
-                    escapedValue = escapedValue.replacingOccurrences(of: $0.rawValue, with: $0.replacement())
-                }
-
-                return escapedValue
-            }
-        }
-
-        return EscapedCharacters.escapeString(rawContent)
-    }
-
     // MARK: - Initialization
     convenience init(_ markdown: String) throws {
-        let down = Down(markdownString: Self.escapeContent(markdown))
+        let down = Down(markdownString: escapeContent(markdown))
         let xml = try down.toXML()
         self.init(xmlData: Data(xml.utf8))
     }
@@ -133,6 +102,39 @@ class ParmaCore: NSObject {
     }
 }
 
+// MARK: - Private function
+
+/// Sanitize input to prevent `<` and `>` from causing problems
+private func escapeContent(_ rawContent: String) -> String {
+
+    enum EscapedCharacters: String, CaseIterable {
+
+        case leftAngleBracket = "<",
+             rightAngleBracket = ">"
+
+        func replacement() -> String {
+            switch self {
+            case .leftAngleBracket:
+                return "&lt;"
+            case .rightAngleBracket:
+                return "&gt;"
+            }
+        }
+
+        static func escapeString(_ string: String) -> String {
+            var escapedValue = string
+
+            self.allCases.forEach {
+                escapedValue = escapedValue.replacingOccurrences(of: $0.rawValue, with: $0.replacement())
+            }
+
+            return escapedValue
+        }
+    }
+
+    return EscapedCharacters.escapeString(rawContent)
+}
+
 // MARK: - XML parsing logic
 extension ParmaCore: XMLParserDelegate {
     func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {