Add profile support

Closes #231

src/Spectre.Console/Widgets/Exceptions/ExceptionParser.cs

@@ -0,0 +1,142 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text.RegularExpressions;
+
+namespace Spectre.Console
+{
+    internal static class ExceptionParser
+    {
+        private static readonly Regex _messageRegex = new Regex(@"^(?'type'.*):\s(?'message'.*)$");
+        private static readonly Regex _stackFrameRegex = new Regex(@"^\s*\w*\s(?'method'.*)\((?'params'.*)\)");
+        private static readonly Regex _fullStackFrameRegex = new Regex(@"^\s*(?'at'\w*)\s(?'method'.*)\((?'params'.*)\)\s(?'in'\w*)\s(?'path'.*)\:(?'line'\w*)\s(?'linenumber'\d*)$");
+
+        public static ExceptionInfo? Parse(string exception)
+        {
+            if (exception is null)
+            {
+                throw new ArgumentNullException(nameof(exception));
+            }
+
+            var lines = exception.SplitLines();
+            return Parse(new Queue<string>(lines));
+        }
+
+        private static ExceptionInfo? Parse(Queue<string> lines)
+        {
+            if (lines.Count == 0)
+            {
+                // Error: No lines to parse
+                return null;
+            }
+
+            var line = lines.Dequeue();
+            line = line.ReplaceExact(" ---> ", string.Empty);
+
+            var match = _messageRegex.Match(line);
+            if (!match.Success)
+            {
+                return null;
+            }
+
+            var inner = (ExceptionInfo?)null;
+
+            // Stack frames
+            var frames = new List<StackFrameInfo>();
+            while (lines.Count > 0)
+            {
+                if (lines.Peek().TrimStart().StartsWith("---> ", StringComparison.OrdinalIgnoreCase))
+                {
+                    inner = Parse(lines);
+                    if (inner == null)
+                    {
+                        // Error: Could not parse inner exception
+                        return null;
+                    }
+
+                    continue;
+                }
+
+                line = lines.Dequeue();
+
+                if (string.IsNullOrWhiteSpace(line))
+                {
+                    // Empty line
+                    continue;
+                }
+
+                if (line.TrimStart().StartsWith("--- ", StringComparison.OrdinalIgnoreCase))
+                {
+                    // End of inner exception
+                    break;
+                }
+
+                var stackFrame = ParseStackFrame(line);
+                if (stackFrame == null)
+                {
+                    // Error: Could not parse stack frame
+                    return null;
+                }
+
+                frames.Add(stackFrame);
+            }
+
+            return new ExceptionInfo(
+                match.Groups["type"].Value,
+                match.Groups["message"].Value,
+                frames, inner);
+        }
+
+        private static StackFrameInfo? ParseStackFrame(string frame)
+        {
+            var match = _fullStackFrameRegex.Match(frame);
+            if (match?.Success != true)
+            {
+                match = _stackFrameRegex.Match(frame);
+                if (match?.Success != true)
+                {
+                    return null;
+                }
+            }
+
+            var parameters = ParseMethodParameters(match.Groups["params"].Value);
+            if (parameters == null)
+            {
+                // Error: Could not parse parameters
+                return null;
+            }
+
+            var method = match.Groups["method"].Value;
+            var path = match.Groups["path"].Success ? match.Groups["path"].Value : null;
+
+            var lineNumber = (int?)null;
+            if (!string.IsNullOrWhiteSpace(match.Groups["linenumber"].Value))
+            {
+                lineNumber = int.Parse(match.Groups["linenumber"].Value, CultureInfo.InvariantCulture);
+            }
+
+            return new StackFrameInfo(method, parameters, path, lineNumber);
+        }
+
+        private static List<(string Type, string Name)>? ParseMethodParameters(string parameters)
+        {
+            var result = new List<(string Type, string Name)>();
+            foreach (var parameterPart in parameters.Split(new[] { ", " }, StringSplitOptions.RemoveEmptyEntries))
+            {
+                var parameterNameIndex = parameterPart.LastIndexOf(' ');
+                if (parameterNameIndex == -1)
+                {
+                    // Error: Could not parse parameter
+                    return null;
+                }
+
+                var type = parameterPart.Substring(0, parameterNameIndex);
+                var name = parameterPart.Substring(parameterNameIndex + 1, parameterPart.Length - parameterNameIndex - 1);
+
+                result.Add((type, name));
+            }
+
+            return result;
+        }
+    }
+}