[gh-88] Initial version of Dump()/Inspect().

source/Runtime/Internal/Flow.cs

@@ -1,7 +1,5 @@
 using System;
-using System.Collections;
 using System.Collections.Generic;
-using System.Linq;
 using System.Text;
 
 namespace SharpLab.Runtime.Internal {
@@ -61,9 +59,9 @@ namespace SharpLab.Runtime.Internal {
                 return;
             }
 
-            AppendString(notes, name, ReportLimits.MaxVariableNameLength);
+            ObjectAppender.AppendString(notes, name, ReportLimits.MaxVariableNameLength);
             notes.Append(": ");
-            AppendValue(notes, value);
+            ObjectAppender.Append(notes, value, ReportLimits.MaxEnumerableItems, ReportLimits.MaxVariableValueLength);
             // Have to reassign in case we set Notes
             _steps[_steps.Count - 1] = step;
         }
@@ -74,48 +72,6 @@ namespace SharpLab.Runtime.Internal {
             _steps[_steps.Count - 1] = step;
         }
 
-        private static StringBuilder AppendValue<T>(StringBuilder builder, T value) {
-            if (value == null)
-                return builder.Append("null");
-
-            switch (value) {
-                case IList<int> e: return AppendEnumerable(builder, e);
-                case ICollection e: return AppendEnumerable(builder, e.Cast<object>());
-                default: return AppendString(builder, value.ToString(), ReportLimits.MaxVariableValueLength);
-            }
-        }
-
-        private static StringBuilder AppendEnumerable<T>(StringBuilder builder, IEnumerable<T> enumerable) {
-            builder.Append("{ ");
-            var index = 0;
-            foreach (var item in enumerable) {
-                if (index > 0)
-                    builder.Append(", ");
-
-                if (index > ReportLimits.MaxEnumerableItems) {
-                    builder.Append("…");
-                    break;
-                }
-
-                AppendValue(builder, item);
-                index += 1;
-            }
-            builder.Append(" }");
-            return builder;
-        }
-
-        private static StringBuilder AppendString(StringBuilder builder, string value, int limit) {
-            if (value.Length <= limit) {
-                builder.Append(value);
-            }
-            else {
-                builder.Append(value, 0, limit - 1);
-                builder.Append("…");
-            }
-
-            return builder;
-        }
-
         [Serializable]
         public struct Step {
             public Step(int lineNumber) {

source/Runtime/Internal/InspectionResult.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Text;
+
+namespace SharpLab.Runtime.Internal {
+    [Serializable]
+    public class InspectionResult {
+        public InspectionResult(string title, StringBuilder value) {
+            Title = title;
+            Value = value;
+        }
+
+        public string Title { get; }
+        public StringBuilder Value { get; }
+    }
+}

source/Runtime/Internal/ObjectInspector.cs

@@ -0,0 +1,55 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace SharpLab.Runtime.Internal {
+    public static class ObjectAppender {
+        public static void Append<T>(StringBuilder builder, T value, int? maxEnumerableItemCount = null, int? maxValueLength = null) {
+            if (value == null) {
+                builder.Append("null");
+                return;
+            }
+
+            switch (value) {
+                case ICollection<int> c:
+                    AppendEnumerable(builder, c, maxEnumerableItemCount, maxValueLength);
+                    break;
+                case ICollection c:
+                    AppendEnumerable(builder, c.Cast<object>(), maxEnumerableItemCount, maxValueLength);
+                    break;
+                default:
+                    AppendString(builder, value.ToString(), maxValueLength);
+                    break;
+            }
+        }
+
+        private static void AppendEnumerable<T>(StringBuilder builder, IEnumerable<T> enumerable, int? maxItemCount, int? maxValueLength) {
+            builder.Append("{ ");
+            var index = 0;
+            foreach (var item in enumerable) {
+                if (index > 0)
+                    builder.Append(", ");
+
+                if (index > maxItemCount) {
+                    builder.Append("…");
+                    break;
+                }
+
+                Append(builder, item, maxItemCount, maxValueLength);
+                index += 1;
+            }
+            builder.Append(" }");
+        }
+
+        public static void AppendString(StringBuilder builder, string value, int? maxLength) {
+            if (maxLength == null || value.Length <= maxLength) {
+                builder.Append(value);
+            }
+            else {
+                builder.Append(value, 0, maxLength.Value - 1);
+                builder.Append("…");
+            }
+        }
+    }
+}

source/Runtime/Internal/Output.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+namespace SharpLab.Runtime.Internal {
+    public static class Output {
+        private static readonly List<object> _stream = new List<object>();
+        public static IReadOnlyList<object> Stream => _stream;
+
+        public static void Write(InspectionResult data) {
+            _stream.Add(data);
+        }
+
+        public static void Write(string value) {
+            _stream.Add(value);
+        }
+    }
+}

source/Runtime/ObjectExtensions.cs

@@ -0,0 +1,18 @@
+using System.ComponentModel;
+using System.Text;
+using SharpLab.Runtime.Internal;
+
+public static class ObjectExtensions {
+    // LinqPad/etc compatibility only
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    public static void Dump<T>(this T value) {
+        value.Inspect(title: "Dump");
+    }
+
+    public static void Inspect<T>(this T value, string title = "Inspect") {
+        var builder = new StringBuilder();
+        ObjectAppender.Append(builder, value);
+        var data = new InspectionResult(title, builder);
+        Output.Write(data);
+    }
+}

source/Server/Execution/ExecutionResult.cs

@@ -5,17 +5,18 @@ using SharpLab.Runtime.Internal;
 namespace SharpLab.Server.Execution {
     [Serializable]
     public class ExecutionResult {
-        public ExecutionResult(string returnValue, IReadOnlyList<Flow.Step> flow) {
+        public ExecutionResult(IReadOnlyList<object> output, IReadOnlyList<Flow.Step> flow) {
-            ReturnValue = returnValue;
+            Output = output;
             Flow = flow;
         }
 
-        public ExecutionResult(Exception exception, IReadOnlyList<Flow.Step> flow) {
+        public ExecutionResult(Exception exception, IReadOnlyList<object> output, IReadOnlyList<Flow.Step> flow) {
             Exception = exception;
+            Output = output;
             Flow = flow;
         }
 
-        public string ReturnValue { get; }
+        public IReadOnlyList<object> Output { get; }
         public Exception Exception { get; }
         public IReadOnlyList<Flow.Step> Flow { get; }
     }

source/Server/Execution/Executor.cs

@@ -55,12 +55,14 @@ namespace SharpLab.Server.Execution {
 
         public void Serialize(ExecutionResult result, IFastJsonWriter writer) {
             writer.WriteStartObject();
-            if (result.Exception == null) {
+            if (result.Exception != null)
-                writer.WriteProperty("returnValue", result.ReturnValue);
-            }
-            else {
                 writer.WriteProperty("exception", result.Exception.ToString());
+            writer.WritePropertyStartArray("output");
+            foreach (var item in result.Output) {
+                SerializeOutput(item, writer);
             }
+            writer.WriteEndArray();
+
             writer.WritePropertyStartArray("flow");
             foreach (var step in result.Flow) {
                 SerializeFlowStep(step, writer);
@@ -84,6 +86,27 @@ namespace SharpLab.Server.Execution {
             writer.WriteEndObject();
         }
 
+        private void SerializeOutput(object item, IFastJsonWriter writer) {
+            switch (item) {
+                case InspectionResult inspection:
+                    writer.WriteStartObject();
+                    writer.WriteProperty("type", "inspection");
+                    writer.WriteProperty("title", inspection.Title);
+                    writer.WriteProperty("value", inspection.Value);
+                    writer.WriteEndObject();
+                    break;
+                case string s:
+                    writer.WriteValue(s);
+                    break;
+                case null:
+                    writer.WriteValue("null");
+                    break;
+                default:
+                    writer.WriteValue("Unsupported output object type: " + item.GetType().Name);
+                    break;
+            }
+        }
+
         private static class Remote {
             public static ExecutionResult Execute(Stream assemblyStream, RuntimeGuardToken guardToken) {
                 try {
@@ -93,7 +116,9 @@ namespace SharpLab.Server.Execution {
 
                     using (guardToken.Scope()) {
                         var result = m.Invoke(Activator.CreateInstance(c), null);
-                        return new ExecutionResult(result?.ToString(), Flow.Steps);
+                        if (m.ReturnType != typeof(void))
+                            result.Inspect("Return");
+                        return new ExecutionResult(Output.Stream, Flow.Steps);
                     }
                 }
                 catch (Exception ex) {
@@ -101,7 +126,7 @@ namespace SharpLab.Server.Execution {
                         ex = invocationEx.InnerException;
 
                     Flow.ReportException(ex);
-                    return new ExecutionResult(ex, Flow.Steps);
+                    return new ExecutionResult(ex, Output.Stream, Flow.Steps);
                 }
             }
 

source/Tests/ExecutionTests.cs

@@ -2,6 +2,9 @@
 using System.Linq;
 using System.Runtime.Serialization;
 using System.Threading.Tasks;
+using System.Text;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 using Xunit;
 using AshMind.Extensions;
 using Pedantic.IO;
@@ -9,8 +12,7 @@ using MirrorSharp;
 using MirrorSharp.Testing;
 using SharpLab.Server;
 using SharpLab.Server.MirrorSharp.Internal;
-using Newtonsoft.Json;
+using System;
-using Newtonsoft.Json.Linq;
 
 namespace SharpLab.Tests {
     public class ExecutionTests {
@@ -57,8 +59,23 @@ namespace SharpLab.Tests {
             Assert.Equal(expectedNotes, notes);
         }
 
-        private static int LineNumberFromFlowStep(JToken step) {
+        [Theory]
-            return (step as JObject)?.Value<int>("line") ?? step.Value<int>();
+        [InlineData("3.Inspect();", "Inspect: 3")]
+        [InlineData("(1, 2, 3).Inspect();", "Inspect: (1, 2, 3)")]
+        [InlineData("new[] { 1, 2, 3 }.Inspect();", "Inspect: { 1, 2, 3 }")]
+        [InlineData("3.Dump();", "Dump: 3")]
+        public async Task SlowUpdate_IncludesExpectedOutput_ForInspectAndDump(string code, string expectedOutput) {
+            var driver = await NewTestDriverAsync(@"
+                public class C {
+                    public void M() { " + code + @" }
+                }
+            ");
+
+            var result = await driver.SendSlowUpdateAsync<ExecutionResultData>();
+            var errors = result.JoinErrors();
+
+            Assert.True(errors.IsNullOrEmpty(), errors);
+            Assert.Equal(expectedOutput, result.ExtensionResult.GetOutputAsString());
         }
 
         private static string LoadCodeFromResource(string resourceName) {
@@ -80,6 +97,16 @@ namespace SharpLab.Tests {
             public IList<FlowStepData> Flow { get; } = new List<FlowStepData>();
             [JsonProperty("flow")]
             private IList<JToken> FlowRaw { get; } = new List<JToken>();
+            [JsonProperty]
+            private IList<JToken> Output { get; } = new List<JToken>();
+
+            public string GetOutputAsString() {
+                return string.Join("\n", Output.Select(token => {
+                    if (token is JObject @object)
+                        return @object.Value<string>("title") + ": " + @object.Value<string>("value");
+                    return token.Value<string>();
+                }));
+            }
 
             [OnDeserialized]
             private void OnDeserialized(StreamingContext context) {

source/WebApp/index.html

@@ -106,14 +106,14 @@
           </header>
           <div class="content">
             <div class="loader"></div>
+            <app-run-view class="output"
+                          v-if="lastResultOfType.run"
+                          v-show="result.type === 'run'"
+                          v-bind:output="lastResultOfType.run.value.output"></app-run-view>
             <app-mirrorsharp-readonly v-if="lastResultOfType.code"
                                       v-show="result.type === 'code'"
                                       v-bind:value="lastResultOfType.code.value"
                                       v-bind:language="options.target"></app-mirrorsharp-readonly>
-            <app-run-view class="run-result"
-                          v-if="lastResultOfType.run"
-                          v-show="result.type === 'run'"
-                          v-bind:model="lastResultOfType.run.value"></app-run-view>
             <app-ast-view class="ast"
                           v-if="lastResultOfType.ast"
                           v-show="result.type === 'ast'"

source/WebApp/js/ui/components/app-run-view.js

@@ -2,7 +2,15 @@ import Vue from 'vue';
 
 Vue.component('app-run-view', {
     props: {
-        model: Object
+        output: Array
     },
-    template: `<div>{{model.returnValue}}</div>`
+    template: `<div class="output">
+      <div v-for="item in output">
+        <div v-if="typeof item === 'string'">{{item}}</div>
+        <div v-if="typeof item === 'object' && item.type === 'inspection' && item.value" class="inspection inspection-value-only">
+          <h3>{{item.title}}:</h3>
+          <div class="inspection-value">{{item.value}}</div>
+        </div>
+      </div>
+    </div>`.replace(/[\r\n]+\s*/g, '').replace(/\s{2,}/g, ' ')
 });

source/WebApp/less/app.less

@@ -209,4 +209,5 @@ section.info-only {
 @import 'imports/mobile.less';
 @import 'imports/ast.less';
 @import 'imports/codemirror.less';
+@import 'imports/output.less';
 @import 'imports/offline.less';

source/WebApp/less/imports/forms.less

@@ -17,7 +17,7 @@ option, optgroup {
     border: 1px solid #fff;
 
     &::after {
-        content: '▾';
+        content: '\0025be'; /* ▾ */
         position: absolute;
         right: 2px;
         top: 0;

source/WebApp/less/imports/output.less

@@ -0,0 +1,49 @@
+@import 'common.less';
+
+@inspection-border-color: #aaa;
+@inspection-header-color: #aaa;
+
+.output {
+    position: absolute;
+    left: 0;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    display: flex;
+    flex-direction: column;
+    align-items: flex-start;
+    padding: 2px 4px;
+    overflow: auto;
+}
+
+.output > * + * {
+    margin-top: 2px;
+}
+
+.inspection {
+    border: 1px solid @inspection-border-color;
+}
+
+.inspection-value-only {
+    display: flex;
+    flex-direction: row;
+
+    h3 {
+        min-width: 4.2em;
+    }
+}
+
+.inspection h3 {
+    font-size: inherit;
+    background-color: @inspection-header-color;
+    border-bottom: 1px solid @inspection-border-color;
+    color: #fff;
+    margin: 0;
+    padding: 2px 4px;
+    font-weight: normal;
+}
+
+.inspection-value {
+    text-align: right;
+    padding: 2px 4px;
+}