Redo debug symbols

UIX/Microsoft/Iris/Debug/Symbols/ApplicationDebugSymbols.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Linq;
 
 namespace Microsoft.Iris.Debug.Symbols;
 
@@ -11,24 +12,96 @@ public class ApplicationDebugSymbols
 
 public class FileDebugSymbols
 {
-    public string SourceFileName { get; set; }
+    private string[] _sourceCodeLines;
+
+    public string OriginalFileName { get; set; }
 
     public string CompiledFileName { get; set; }
 
-    public Dictionary<uint, ScriptDebugSymbols> ScriptSymbols { get; set; }
-}
-
-public class ScriptDebugSymbols
-{
-    public string SourceCode { get; set; }
+    public string SourceFileName { get; set; }
 
     public Dictionary<uint, SourceSpan> SourceMap { get; set; }
+
+    public uint OffsetByLineAndColumn(int line, int col) => OffsetByLineAndColumn(new(line, col));
+
+    public uint OffsetByLineAndColumn(SourcePosition pos)
+    {
+        Assert.IsNotNull(_sourceCodeLines, nameof(_sourceCodeLines));
+
+        return SourceMap.First(kvp =>
+        {
+            var offset = kvp.Key;
+            var span = kvp.Value;
+            return span.Contains(pos);
+        }).Key;
+    }
+
+    public void SetSourceCode(string source)
+    {
+        _sourceCodeLines = source.Split('\n')
+            .Select(s => s.TrimEnd('\r'))
+            .ToArray();
+    }
+}
+
+[DebuggerDisplay("L{Line}C{Column}")]
+public class SourcePosition : IComparable<SourcePosition>, IEquatable<SourcePosition>
+{
+    public int Line { get; }
+
+    public int Column { get; }
+
+    private ulong Position => ((ulong)Line << (sizeof(uint) * 8)) | (uint)Column;
+
+    public SourcePosition(int line, int column)
+    {
+        if (line <= 0)
+            throw new ArgumentOutOfRangeException(nameof(line));
+
+        if (column <= 0)
+            throw new ArgumentOutOfRangeException(nameof(line));
+
+        Line = line;
+        Column = column;
+    }
+
+    public int CompareTo(SourcePosition other) => Position.CompareTo(other.Position);
+
+    public bool Equals(SourcePosition other) => Position == other.Position;
+
+    public override bool Equals(object obj)
+    {
+        if (obj is not SourcePosition other)
+            return false;
+        return Equals(other);
+    }
+
+    public override int GetHashCode()
+    {
+        int hashCode = 533871040;
+        hashCode = hashCode * -1521134295 + Line.GetHashCode();
+        hashCode = hashCode * -1521134295 + Column.GetHashCode();
+        hashCode = hashCode * -1521134295 + Position.GetHashCode();
+        return hashCode;
+    }
+
+    public static bool operator <(SourcePosition left, SourcePosition right) => left.CompareTo(right) < 0;
+
+    public static bool operator >(SourcePosition left, SourcePosition right) => left.CompareTo(right) > 0;
+
+    public static bool operator <=(SourcePosition left, SourcePosition right) => left.CompareTo(right) <= 0;
+
+    public static bool operator >=(SourcePosition left, SourcePosition right) => left.CompareTo(right) >= 0;
+
+    public static bool operator ==(SourcePosition left, SourcePosition right) => left.Equals(right);
+
+    public static bool operator !=(SourcePosition left, SourcePosition right) => !(left == right);
 }
 
 [DebuggerDisplay("[{Start}..{End}]")]
 public class SourceSpan
 {
-    public SourceSpan(int start, int end)
+    public SourceSpan(SourcePosition start, SourcePosition end)
     {
         if (start > end)
             throw new ArgumentException($"Source start index must be at or after end index.");
@@ -37,10 +110,10 @@ public class SourceSpan
         End = end;
     }
 
-    public int Start { get; set; }
+    public SourcePosition Start { get; }
 
-    public int End { get; set; }
+    public SourcePosition End { get; }
 
-    public int GetLength() => End - Start;
+    public bool Contains(SourcePosition pos) => Start >= pos && pos < End;
 }
 

UIX/Microsoft/Iris/Debug/Symbols/DebugSymbolsJsonParser.cs

@@ -1,12 +1,14 @@
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using System;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace Microsoft.Iris.Debug.Symbols;
 
 public static class DebugSymbolsJsonParser
 {
-    private static JsonSerializerSettings _settings = new()
+    private static readonly JsonSerializerSettings _settings = new()
     {
         Converters = [new SourceSpanJsonConverter()],
     };
@@ -25,18 +27,50 @@ public static class DebugSymbolsJsonParser
 
     private class SourceSpanJsonConverter : JsonConverter
     {
-        public override bool CanConvert(Type objectType) => objectType == typeof(SourceSpan);
+        public override bool CanConvert(Type objectType) => objectType == typeof(SourceSpan) || objectType == typeof(SourcePosition);
 
         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
         {
-            var span = (SourceSpan)value;
-            JArray array = [span.Start, span.End];
+            if (value is SourceSpan span)
+            {
+                JArray array = [$"{span.Start.Line}:{span.Start.Column}", $"{span.End.Line}:{span.End.Column}"];
                 array.WriteTo(writer);
             }
+            else if (value is SourcePosition position)
+            {
+                writer.WriteValue($"{position.Line}:{position.Column}");
+            }
+        }
 
         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
         {
+            if (objectType == typeof(SourcePosition))
+            {
+                if (reader.TokenType is not JsonToken.String)
+                    throw new JsonReaderException($"Expected {nameof(SourcePosition)} encoded as string");
+
+                var positionString = reader.ReadAsString();
+                ParseSourcePosition(positionString);
+            }
+            else if (objectType == typeof(SourceSpan))
+            {
+                var rangeStrs = serializer.Deserialize<IEnumerable<string>>(reader);
+                var range = rangeStrs.Select(ParseSourcePosition).ToArray();
+                return new SourceSpan(range[0], range[1]);
+            }
+
             throw new NotImplementedException();
+
+            static SourcePosition ParseSourcePosition(string positionString)
+            {
+                var delimiterIndex = positionString.IndexOf(':');
+                if (delimiterIndex <= 0)
+                    throw new JsonReaderException($"Expected {nameof(SourcePosition)} formatted as line:column");
+
+                var line = int.Parse(positionString.Substring(0, delimiterIndex));
+                var column = int.Parse(positionString.Substring(delimiterIndex + 1));
+                return new SourcePosition(line, column);
+            }
         }
     }
 }