From 6fe4972aa48a29d0aafee0461ccd6c635ca9ee6c Mon Sep 17 00:00:00 2001
From: Sophia Pearson <codergal89@gmail.com>
Date: Mon, 23 May 2022 00:02:58 +0200
Subject: commands: add basic command parser infrastructure

---
 Scripts/Command.cs              | 22 ++++++++++++++--
 Scripts/CommandParser.cs        | 27 ++++++++++++-------
 Scripts/Commands/LookCommand.cs | 57 +++++++++++++++++++++++++++++++++++++++++
 Scripts/OutputRow.cs            |  8 +++---
 4 files changed, 99 insertions(+), 15 deletions(-)
 create mode 100644 Scripts/Commands/LookCommand.cs

(limited to 'Scripts')

diff --git a/Scripts/Command.cs b/Scripts/Command.cs
index 4a7ce58..e784576 100644
--- a/Scripts/Command.cs
+++ b/Scripts/Command.cs
@@ -1,7 +1,25 @@
+using Godot;
+
 namespace Texty.Scripts
 {
-    public class Command
+    public enum CommandType
     {
-        
+        Look
+    }
+
+    public class Command : Object
+    {
+        public Command()
+        {
+        }
+
+        public Command(CommandType type, string[] arguments)
+        {
+            RawArguments = arguments;
+            Type = type;
+        }
+
+        public string[] RawArguments { get; }
+        public CommandType Type { get; }
     }
 }
\ No newline at end of file
diff --git a/Scripts/CommandParser.cs b/Scripts/CommandParser.cs
index 1394a5e..97d8025 100644
--- a/Scripts/CommandParser.cs
+++ b/Scripts/CommandParser.cs
@@ -1,14 +1,23 @@
+using System.Linq;
 using Godot;
+using Texty.Scripts.Commands;
 
 namespace Texty.Scripts
 {
-	public class CommandParser : Node
-	{
-
-		public override void _Ready()
-		{
-		}
-
-	}
-}
+    public class CommandParser : Node
+    {
+        public override void _Ready()
+        {
+        }
 
+        public Command TryParse(string text)
+        {
+            var components = text.Split(' ');
+            return components[0].ToLower() switch
+            {
+                "look" => new LookCommand(components.Skip(1).ToArray()),
+                _ => null
+            };
+        }
+    }
+}
\ No newline at end of file
diff --git a/Scripts/Commands/LookCommand.cs b/Scripts/Commands/LookCommand.cs
new file mode 100644
index 0000000..08783a9
--- /dev/null
+++ b/Scripts/Commands/LookCommand.cs
@@ -0,0 +1,57 @@
+using System.Linq;
+
+namespace Texty.Scripts.Commands
+{
+    public enum LookModifier
+    {
+        At,
+        Around
+    }
+
+    public class LookCommand : Command
+    {
+        public LookCommand()
+        {
+        }
+
+        public LookCommand(string[] arguments) : base(CommandType.Look, arguments)
+        {
+            (Modifier, arguments) = TryParseModifier(arguments);
+            Target = string.Join(" ", arguments);
+        }
+
+        public string Target { get; }
+        public LookModifier? Modifier { get; }
+
+        /// <summary>
+        ///     Access this <c>LookCommand</c>'s modifier as a string.
+        /// </summary>
+        /// <remarks>
+        ///     This function is provided as a means for testing the modifier parsing from GDScript.
+        /// </remarks>
+        private string ModifierAsString => Modifier?.ToString();
+
+        public override string ToString()
+        {
+            return $"look {ModifierAsString?.ToLower()} {string.Join(" ", Target)}";
+        }
+
+        /// <summary>
+        ///     Try to parse this <c>LookCommand</c>'s modifier from the given arguments.
+        /// </summary>
+        /// <param name="arguments">The arguments given to this look commands</param>
+        /// <returns>A pair consisting of the parse modifier and the remaining arguments</returns>
+        private static (LookModifier?, string[]) TryParseModifier(string[] arguments)
+        {
+            if (arguments.Length == 0)
+                return (null, arguments);
+
+            return arguments[0].ToLower() switch
+            {
+                "at" => (LookModifier.At, arguments.Skip(1).ToArray()),
+                "around" => (LookModifier.Around, new string[] { }),
+                _ => (null, arguments)
+            };
+        }
+    }
+}
\ No newline at end of file
diff --git a/Scripts/OutputRow.cs b/Scripts/OutputRow.cs
index 15a6454..13d9293 100644
--- a/Scripts/OutputRow.cs
+++ b/Scripts/OutputRow.cs
@@ -11,12 +11,12 @@ namespace Texty.Scripts
         [Signal]
         public delegate void OutputTextChanged(string newText);
 
-        public Label Input;
-        public Label Output;
-
         private string _inputText = "";
         private string _outputText = "";
 
+        public Label Input;
+        public Label Output;
+
         [Export]
         public string InputText
         {
@@ -69,4 +69,4 @@ namespace Texty.Scripts
             Output
         }
     }
-}   
\ No newline at end of file
+}
\ No newline at end of file
-- 
cgit v1.2.3