- Add predefined variables

- Add `mod` function
- Improve function calling syntax

YesNt.Interpreter/Statements/PredifinedVariableStatements.cs

@@ -0,0 +1,50 @@
+using System;
+
+using YesNt.Interpreter.Attributes;
+using YesNt.Interpreter.Enums;
+using YesNt.Interpreter.Utilities;
+
+namespace YesNt.Interpreter.Statements
+{
+    internal class PredifinedVariableStatements : StatementRuntimeInformation
+    {
+        private readonly Random random = new Random();
+
+        [Statement("%tim", SearchMode.Contains, SpaceAround.End, ConsoleColor.Blue, KeepStatementInArgs = true, Priority = Priority.Highest)]
+        public void GetUnixTimestamp(string args)
+        {
+            args += " ";
+
+            while (args.Contains("%tim "))
+            {
+                args = args.ReplaceFirstOccurrence("%tim ", $"{DateTimeOffset.Now.ToUnixTimeSeconds()}");
+            }
+
+            RuntimeInfo.CurrentLine = args.TrimEnd();
+        }
+
+        [Statement("%pi", SearchMode.Contains, SpaceAround.End, ConsoleColor.Blue, KeepStatementInArgs = true, Priority = Priority.Highest)]
+        public void GetPi(string args)
+        {
+            args += " ";
+
+
+            args = args.Replace("%pi ", $"{Math.PI} ");
+
+            RuntimeInfo.CurrentLine = args.TrimEnd();
+        }
+
+        [Statement("%rnd", SearchMode.Contains, SpaceAround.End, ConsoleColor.Blue, KeepStatementInArgs = true, Priority = Priority.Highest)]
+        public void GetRandom(string args)
+        {
+            args += " ";
+
+            while (args.Contains("%rnd "))
+            {
+                args = args.ReplaceFirstOccurrence("%rnd ", $"{random.Next() % 2} ");
+            }
+
+            RuntimeInfo.CurrentLine = args.TrimEnd();
+        }
+    }
+}