Add TextEditor component;

ImGui.Forms/Controls/Text/Editor/Coordinate.cs

@@ -0,0 +1,69 @@
+using System;
+
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    public struct Coordinate
+    {
+        public int Line { get; set; }
+        public int Column { get; set; }
+
+        public Coordinate()
+        {
+            Line = -1;
+            Column = -1;
+        }
+
+        public Coordinate(int line, int column)
+        {
+            Line = Math.Max(0, line);
+            Column = Math.Max(0, column);
+        }
+
+        public static bool operator ==(Coordinate a, Coordinate o) => a.Line == o.Line && a.Column == o.Column;
+        public static bool operator !=(Coordinate a, Coordinate o) => a.Line != o.Line || a.Column != o.Column;
+
+        public static bool operator <(Coordinate a, Coordinate o)
+        {
+            if (a.Line != o.Line)
+                return a.Line < o.Line;
+
+            return a.Column < o.Column;
+        }
+        public static bool operator >(Coordinate a, Coordinate o)
+        {
+            if (a.Line != o.Line)
+                return a.Line > o.Line;
+
+            return a.Column > o.Column;
+        }
+
+        public static bool operator <=(Coordinate a, Coordinate o)
+        {
+            if (a.Line != o.Line)
+                return a.Line < o.Line;
+
+            return a.Column <= o.Column;
+        }
+        public static bool operator >=(Coordinate a, Coordinate o)
+        {
+            if (a.Line != o.Line)
+                return a.Line > o.Line;
+
+            return a.Column >= o.Column;
+        }
+
+        public bool Equals(Coordinate other)
+        {
+            return Line == other.Line && Column == other.Column;
+        }
+        public override bool Equals(object obj)
+        {
+            return obj is Coordinate other && Equals(other);
+        }
+
+        public override int GetHashCode()
+        {
+            return HashCode.Combine(Line, Column);
+        }
+    }
+}

ImGui.Forms/Controls/Text/Editor/EditorState.cs

@@ -0,0 +1,9 @@
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    struct EditorState
+    {
+        public Coordinate SelectionStart { get; set; }
+        public Coordinate SelectionEnd { get; set; }
+        public Coordinate CursorPosition { get; set; }
+    }
+}

ImGui.Forms/Controls/Text/Editor/Glyph.cs

@@ -0,0 +1,18 @@
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    class Glyph
+    {
+        public char Character { get; }
+        public PaletteIndex ColorIndex { get; set; }
+
+        public bool IsComment { get; set; }
+        public bool IsMultiLineComment { get; set; }
+        public bool IsPreprocessor { get; set; }
+
+        public Glyph(char character, PaletteIndex colorIndex = PaletteIndex.Default)
+        {
+            Character = character;
+            ColorIndex = colorIndex;
+        }
+    }
+}

ImGui.Forms/Controls/Text/Editor/GlyphLine.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    class GlyphLine
+    {
+        public bool HasCarriageReturn { get; set; }
+        public List<Glyph> Glyphs { get; } = new();
+
+        public int Length => Glyphs.Count;
+
+        public Glyph this[int i]
+        {
+            get => Glyphs[i];
+            set => Glyphs[i] = value;
+        }
+    }
+}

ImGui.Forms/Controls/Text/Editor/Identifier.cs

@@ -0,0 +1,8 @@
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    public struct Identifier
+    {
+        public Coordinate Location { get; set; }
+        public string Value { get; set; }
+    }
+}

ImGui.Forms/Controls/Text/Editor/LanguageDefinition.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    public class LanguageDefinition
+    {
+        public string Name { get; protected set; } = string.Empty;
+
+        public IReadOnlySet<string> Keywords { get; protected set; } = new HashSet<string>();
+        public IReadOnlyDictionary<string, Identifier> Identifiers { get; protected set; } = new Dictionary<string, Identifier>();
+        public IReadOnlyDictionary<string, Identifier> Preprocessors { get; protected set; } = new Dictionary<string, Identifier>();
+        public IReadOnlyList<(string, PaletteIndex)> TokenRegularExpressions { get; protected set; } = new List<(string, PaletteIndex)>();
+
+        public string SingleLineCommentIdentifier { get; protected set; } = string.Empty;
+        public string CommentStartIdentifier { get; protected set; } = string.Empty;
+        public string CommentEndIdentifier { get; protected set; } = string.Empty;
+        public char PreprocessorCharacter { get; protected set; } = '#';
+
+        public bool IsAutoIndentation { get; protected set; }
+        public bool IsCaseSensitive { get; protected set; }
+
+
+        public virtual bool CanTokenize() => false;
+
+        public virtual bool Tokenize(string text, int inBegin, int inEnd,
+            out int outBegin, out int outEnd, out PaletteIndex paletteIndex)
+        {
+            outBegin = 0;
+            outEnd = 0;
+            paletteIndex = 0;
+
+            return false;
+        }
+    }
+
+}

ImGui.Forms/Controls/Text/Editor/PaletteIndex.cs

@@ -0,0 +1,28 @@
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    public enum PaletteIndex
+    {
+        Default,
+        Keyword,
+        Number,
+        String,
+        CharLiteral,
+        Punctuation,
+        Preprocessor,
+        Identifier,
+        KnownIdentifier,
+        PreprocessorIdentifier,
+        Comment,
+        MultiLineComment,
+        Background,
+        Cursor,
+        Selection,
+        ErrorMarker,
+        Breakpoint,
+        LineNumber,
+        CurrentLineFill,
+        CurrentLineFillInactive,
+        CurrentLineEdge,
+        Max
+    }
+}

ImGui.Forms/Controls/Text/Editor/SelectionMode.cs

@@ -0,0 +1,9 @@
+namespace ImGui.Forms.Controls.Text.Editor
+{
+    public enum SelectionMode
+    {
+        Normal,
+        Word,
+        Line
+    }
+}