feat: move PD Core into Essentials

src/PepperDash.Core/XSigUtility/Tokens/XSigDigitalToken.cs

@@ -0,0 +1,85 @@
+using System;
+
+namespace PepperDash.Core.Intersystem.Tokens
+{
+    /// <summary>
+    /// Represents an XSigDigitalToken
+    /// </summary>
+    public sealed class XSigDigitalToken : XSigToken
+    {
+        private readonly bool _value;
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="index"></param>
+        /// <param name="value"></param>
+        public XSigDigitalToken(int index, bool value)
+            : base(index)
+        {
+            // 12-bits available for digital encoded data
+            if (index >= 4096 || index < 0)
+                throw new ArgumentOutOfRangeException("index");
+
+            _value = value;
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        public bool Value
+        {
+            get { return _value; }
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        public override XSigTokenType TokenType
+        {
+            get { return XSigTokenType.Digital; }
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public override byte[] GetBytes()
+        {
+            return new[] {
+                (byte)(0x80 | (Value ? 0 : 0x20) | ((Index - 1) >> 7)),
+                (byte)((Index - 1) & 0x7F)
+            };
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="offset"></param>
+        /// <returns></returns>
+        public override XSigToken GetTokenWithOffset(int offset)
+        {
+            if (offset == 0) return this;
+            return new XSigDigitalToken(Index + offset, Value);
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public override string ToString()
+        {
+            return Index + " = " + (Value ? "High" : "Low");
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="formatProvider"></param>
+        /// <returns></returns>
+        public string ToString(IFormatProvider formatProvider)
+        {
+            return Value.ToString(formatProvider);
+        }
+    }
+}