v1.0.0

* Implements typing of helper functions
* Shift+F1 opens a new debug visualizer window if none is opened yet

.vscode/launch.json

@@ -1,6 +1,13 @@
 {
 	"version": "0.2.0",
 	"configurations": [
+		{
+			"type": "chrome",
+			"request": "launch",
+			"name": "Launch Chrome",
+			"url": "http://localhost:8090",
+			"webRoot": "${workspaceFolder}/visualization-playground"
+		},
 		{
 			"name": "Run Extension (Hot Reload)",
 			"type": "extensionHost",
@@ -8,7 +15,7 @@
 			"runtimeExecutable": "${execPath}",
 			"args": [
 				"--extensionDevelopmentPath=${workspaceFolder}/extension",
-				"${workspaceFolder}\\demo"
+				"${workspaceFolder}\\demos\\php"
 			],
 			"env": {
 				"HOT_RELOAD": "true",
@@ -24,7 +31,7 @@
 			"runtimeExecutable": "${execPath}",
 			"args": [
 				"--extensionDevelopmentPath=${workspaceFolder}/extension",
-				"${workspaceFolder}\\demo"
+				"${workspaceFolder}\\demos\\php"
 			],
 			"env": {
 				"HOT_RELOAD": "true",
@@ -40,7 +47,7 @@
 			"runtimeExecutable": "${execPath}",
 			"args": [
 				"--extensionDevelopmentPath=${workspaceFolder}/extension",
-				"${workspaceFolder}\\demo"
+				"${workspaceFolder}\\demos\\js"
 			],
 			"env": {
 				"HOT_RELOAD": "",
@@ -55,7 +62,7 @@
 			"runtimeExecutable": "${execPath}",
 			"args": [
 				"--extensionDevelopmentPath=${workspaceFolder}/extension",
-				"${workspaceFolder}\\demo"
+				"${workspaceFolder}\\demos\\php"
 			],
 			"env": {
 				"HOT_RELOAD": "",

.vscode/settings.json

@@ -4,5 +4,8 @@
 	},
 	"plantuml.diagramsRoot": "docs",
 	"plantuml.exportFormat": "png",
-	"plantuml.exportOutDir": "docs/exported"
+	"plantuml.exportOutDir": "docs/exported",
+	"typescript.updateImportsOnFileMove.enabled": "prompt",
+	"mochaExplorer.files": "./data-extraction/test/**/*.test.ts",
+	"mochaExplorer.require": ["ts-node/register", "source-map-support/register"]
 }

CONTRIBUTING.md

@@ -0,0 +1,71 @@
+# Contributing
+
+This document extends the [readme](./extension/README.md) of the extension with implementation details.
+
+## Build Instructions
+
+-   Clone the repository
+-   Run `yarn` in the repository root
+-   Run `yarn build`
+
+## Dev Instructions
+
+This project uses yarn workspaces and consists of the sub-projects _data-extraction_, _extension_ and _webview_.
+To setup a dev environment, follow these steps:
+
+-   Clone the repository
+-   Run `yarn` in the repository root
+-   Run `yarn build` initially (or `yarn dev` for every sub-project)
+-   Run `yarn dev` for the sub-project (i.e. in its folder) you are working on.
+
+For the _webview_ project, `yarn dev` will serve the react application on port 8080.
+Certain query parameters need to be set, so that the UI can connect to the debug visualizer extension.
+
+You can use VS Code to launch and debug the extension.
+Choose the preconfigured `Run Extension (Dev UI)` as debug configuration
+so that the extension loads the UI from the webpack server.
+Otherwise, the extension will start a webserver on its own, hosting the `dist` folder of the _webview_ project.
+
+## Publish Instructions
+
+-   Follow the Build Instructions
+-   `cd extension`
+-   `yarn pub`
+
+## Architecture
+
+![](./docs/exported/main/Main.png)
+
+### webview
+
+Implements the UI and is hosted inside a webview in VS Code.
+Can be opened in a browser window.
+Uses websockets and JSON RPC to communicate with the extension.
+
+### visualization
+
+Contains React components that visualize various JSON documents.
+Also provides infrastructure for selecting the best visualization for a given JSON document.
+
+### visualization-playground
+
+A playground to test and play with the visualizations for the web.
+Is hosted at [https://hediet.github.io/vscode-debug-visualizer/](https://hediet.github.io/vscode-debug-visualizer/).
+Aims to have fast build times.
+
+### extension
+
+Creates the webview in VS Code, hosts a webserver and a websocket server.
+The webserver serves the _webview_ project that is loaded by the webview.
+If started with the `Run Extension (Dev UI)` debug configuration, it will load
+the page from `http://localhost:8080` rather than from its own http server.
+
+The webview is served from an http server rather than the file system to work around some security mechanisms,
+which would prevent lazy chunk loading or websockets.
+
+After the webview is loaded, it connects to the websocket server.
+The websocket server is used to evaluate expressions and is secured by a random token.
+
+### data-extraction
+
+Provides types and a JS runtime for data extraction.

LICENSE.md

@@ -1,21 +1,674 @@
-MIT License
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
 
-Copyright (c) 2020 Henning Dieterichs
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+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version. For
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+patent sublicenses in a manner consistent with the requirements of
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+
+Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
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+propagate the contents of its contributor version.
+
+In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement). To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients. "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
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+
+If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License. You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all. For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+13. Use with the GNU Affero General Public License.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and`show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -2,58 +2,10 @@
 
 [![](https://img.shields.io/twitter/follow/hediet_dev.svg?style=social)](https://twitter.com/intent/follow?screen_name=hediet_dev)
 
-See [here](./extension/README.md) for the readme of the extension.
+See [README.md](./extension/README.md) for the readme of the extension.
+
 You can get the extension in the [marketplace](https://marketplace.visualstudio.com/items?itemName=hediet.debug-visualizer).
 
+See [CONTRIBUTING.md](./CONTRIBUTING.md) for build instructions and implementation details.
+
 ![](./docs/doubly-linked-list-reverse-demo.gif)
-
-This readme extends the [readme](./extension/README.md) of the extension with implementation details.
-
-## Build Instructions
-
--   Clone the repository
--   Run `yarn` in the repository root
--   Run `yarn build`
-
-## Dev Instructions
-
-This project uses yarn workspaces and consists of the sub-projects _data-extraction_, _extension_ and _webview_.
-To setup a dev environment, follow these steps:
-
--   Clone the repository
--   Run `yarn` in the repository root
--   Run `yarn build` initially (or `yarn dev` for every sub-project)
--   Run `yarn dev` for the sub-project (i.e. in its folder) you are working on.
-
-For the _webview_ project, `yarn dev` will serve the react application on port 8080.
-Certain query parameters need to be so that the UI can connect to the debug visualizer extension.
-
-You can use VS Code to launch and debug the extension.
-Chose the preconfigured `Run Extension (Dev UI)` as debug configuration
-so that the extension loads the UI from the webpack server.
-Otherwise, the extension will start a webserver on its own, hosting the `dist` folder of the _webview_ project.
-
-## Publish Instructions
-
--   Follow the Build Instructions
--   `cd extension`
--   `yarn pub`
-
-## Architecture
-
-![](./docs/exported/main/Main.png)
-
-### webview
-
-Provides the UI and is hosted inside a webview in VS Code.
-
-### extension
-
-Creates the webview in VS Code, hosts a webserver and a websocket server.
-The webserver serves the _webview_ project that is loaded by the webview.
-After the webview is loaded, it connects to the websocket server.
-The websocket server is used to evaluate expressions and is secured by a random token.
-
-### data-extraction
-
-Provides types and a JS runtime for data extraction.

data-extraction/LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Henning Dieterichs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

data-extraction/package.json

@@ -23,10 +23,17 @@
 	},
 	"scripts": {
 		"dev": "webpack --watch --mode development",
-		"build": "webpack --mode production"
+		"build": "webpack --mode production",
+		"test": "mocha --require source-map-support/register --require ts-node/register ./test/**/*.test.ts"
 	},
 	"dependencies": {},
 	"devDependencies": {
+		"@types/mocha": "^7.0.2",
+		"coveralls": "^3.0.11",
+		"mocha": "^7.1.1",
+		"mocha-lcov-reporter": "^1.3.0",
+		"nyc": "^15.0.0",
+		"source-map-support": "^0.5.16",
 		"typescript": "^3.8.2",
 		"@types/plotly.js": "1.44.28",
 		"@types/node": "^13.7.4",

data-extraction/src/js/api/DataExtractorApiImpl.ts

@@ -9,6 +9,9 @@ import {
 import { ExtractedData, DataExtractorInfo } from "../../DataExtractionResult";
 import { registerDefaultExtractors } from "./default-extractors";
 
+/**
+ * @internal
+ */
 export class DataExtractorApiImpl implements DataExtractorApi {
 	public static lastEvalFn: (<T>(expression: string) => T) | undefined;
 

data-extraction/src/js/api/index.ts

@@ -1,2 +1,3 @@
 export * from "./DataExtractorApi";
 export * from "./injection";
+export { DataExtractorApiImpl } from "./DataExtractorApiImpl";

data-extraction/src/js/helpers/cache.ts

@@ -0,0 +1,31 @@
+import { DataExtractorApiImpl } from "../api";
+
+const cached = new Map<string, any>();
+
+/**
+ * Evaluates an expression
+ */
+export function cache<T>(
+	expression: string | (() => T),
+	id: string | number | undefined = undefined
+): T {
+	let resultFn: () => any;
+	let key: string;
+	if (typeof expression === "string") {
+		const evalFn = DataExtractorApiImpl.lastEvalFn!;
+		resultFn = () => evalFn(expression);
+		key = JSON.stringify({ expr: expression, id });
+	} else {
+		resultFn = () => expression();
+		key = JSON.stringify({ expr: expression.toString(), id });
+	}
+
+	if (cached.has(key)) {
+		return cached.get(key);
+	}
+
+	const result = resultFn();
+	cached.set(key, result);
+
+	return result;
+}

data-extraction/src/js/helpers/index.ts

@@ -2,3 +2,4 @@ export * from "./createGraph";
 export * from "./createGraphFromPointers";
 export * from "./tryEval";
 export * from "./markedGrid";
+export * from "./cache";

data-extraction/test/main.test.ts

@@ -0,0 +1,13 @@
+import { DataExtractorApiImpl } from "../";
+
+describe("extractor", () => {
+	it("should not crash", () => {
+		const dataExtractor = new DataExtractorApiImpl();
+		dataExtractor.registerDefaultExtractors();
+		const result = dataExtractor.getData(
+			() => [1, 2, 3],
+			() => null!,
+			undefined
+		);
+	});
+});

data-extraction/test/tsconfig.json

@@ -0,0 +1,16 @@
+{
+	"compilerOptions": {
+		"target": "esnext",
+		"module": "commonjs",
+		"strict": true,
+		"skipLibCheck": true,
+		"rootDir": "./",
+		"resolveJsonModule": true,
+		"declaration": true,
+		"declarationMap": true,
+		"newLine": "LF",
+		"sourceMap": true,
+		"noEmit": true
+	},
+	"include": ["./**/*"]
+}

data-extraction/tsconfig.json

@@ -3,7 +3,7 @@
 		"target": "esnext",
 		"module": "commonjs",
 		"strict": true,
-		"outDir": "dist",
+		"outDir": "./dist",
 		"skipLibCheck": true,
 		"rootDir": "./src",
 		"resolveJsonModule": true,

data-extraction/webpack.config.ts

@@ -36,7 +36,7 @@ module.exports = {
 	},
 	plugins: [
 		new CleanWebpackPlugin({
-			protectWebpackAssets: true,
+			//protectWebpackAssets: true,
 			cleanAfterEveryBuildPatterns: ["!**/*.d.ts", "!**/*.d.ts.map"],
 		}),
 	],

demo/.vscode/launch.json

@@ -1,89 +0,0 @@
-{
-	// Use IntelliSense to find out which attributes exist for C# debugging
-	// Use hover for the description of the existing attributes
-	// For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
-	"version": "0.2.0",
-	"configurations": [
-		{
-			"type": "java",
-			"name": "CodeLens (Launch) - DemoLinkedLists",
-			"request": "launch",
-			"mainClass": "DemoLinkedLists"
-		},
-		{
-			"type": "node",
-			"request": "launch",
-			"name": "TypeScript - Demo: Custom Data Extractor",
-			"program": "${workspaceFolder}/js/dist/demo_custom-data-extractor",
-			"skipFiles": ["<node_internals>/**"],
-			"preLaunchTask": "typescript-watch"
-		},
-		{
-			"type": "node",
-			"request": "launch",
-			"name": "TypeScript - Demo: Doubly Linked List",
-			"program": "${workspaceFolder}/js/dist/demo_doubly-linked-list",
-			"skipFiles": ["<node_internals>/**"],
-			"preLaunchTask": "typescript-watch"
-		},
-		{
-			"type": "node",
-			"request": "launch",
-			"name": "TypeScript - Demo: Sorting",
-			"program": "${workspaceFolder}/js/dist/demo_sorting",
-			"skipFiles": ["<node_internals>/**"],
-			"preLaunchTask": "typescript-watch"
-		},
-		{
-			"type": "node",
-			"request": "launch",
-			"name": "TypeScript - Demo: Random Walks",
-			"program": "${workspaceFolder}/js/dist/demo_random-walks",
-			"skipFiles": ["<node_internals>/**"],
-			"preLaunchTask": "typescript-watch"
-		},
-		{
-			"type": "node",
-			"request": "launch",
-			"name": "TypeScript - Demo: TypeScript ASTs",
-			"program": "${workspaceFolder}/js/dist/demo_typescript-asts",
-			"skipFiles": ["<node_internals>/**"],
-			"preLaunchTask": "typescript-watch",
-			"cwd": "${workspaceFolder}/js"
-		},
-		{
-			"type": "node",
-			"request": "launch",
-			"name": "JavaScript - Demo: Singly Linked List",
-			"program": "${workspaceFolder}/js/src/demo_singly-linked-list",
-			"skipFiles": ["<node_internals>/**"],
-			"preLaunchTask": "typescript-watch"
-		},
-		{
-			"name": "C# - Demo: Linked List",
-			"type": "coreclr",
-			"request": "launch",
-			"preLaunchTask": "csharp-build",
-			"program": "${workspaceFolder}/csharp/bin/Debug/netcoreapp3.1/demo.dll",
-			"args": [],
-			"cwd": "${workspaceFolder}/csharp",
-			"console": "internalConsole",
-			"stopAtEntry": false
-		},
-		{
-			"name": "PHP - Demo",
-			"type": "php",
-			"request": "launch",
-			"program": "${workspaceFolder}/php/demo.php",
-			"xdebugSettings": {
-				"max_data": -1
-			}
-		},
-		{
-			"name": "Java - Demo",
-			"type": "java",
-			"request": "launch",
-			"projectName": "java"
-		}
-	]
-}

demo/java/.vscode/settings.json

@@ -1,4 +0,0 @@
-{
-    "java.dependency.packagePresentation": "flat",
-    "java.dependency.syncWithFolderExplorer": true
-}

demos/cpp/.gitignore

@@ -0,0 +1 @@
+main

demos/cpp/.vscode/launch.json

@@ -0,0 +1,29 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "g++ build and debug active file",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${fileDirname}/${fileBasenameNoExtension}",
+            "args": [],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ],
+            "preLaunchTask": "g++ build active file",
+            "miDebuggerPath": "/usr/bin/gdb"
+        }
+    ]
+}

demos/cpp/.vscode/tasks.json

@@ -0,0 +1,25 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558 
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "type": "shell",
+            "label": "g++ build active file",
+            "command": "/usr/bin/g++",
+            "args": [
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}/${fileBasenameNoExtension}"
+            ],
+            "options": {
+                "cwd": "/usr/bin"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": "build"
+        }
+    ]
+}

demos/cpp/main.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+#include <vector>
+#include <string>
+
+using namespace std;
+
+int main()
+{
+    // visualize `myGraphJson`!
+    string myGraphJson = "{\"kind\":{\"graph\":true},"
+        "\"nodes\":[{\"id\":\"1\"},{\"id\":\"2\"}],"
+        "\"edges\":[{\"from\":\"1\",\"to\":\"2\"}]}";
+    cout << myGraphJson;
+}

demos/csharp/.vscode/launch.json

@@ -0,0 +1,19 @@
+{
+	// Use IntelliSense to find out which attributes exist for C# debugging
+	// Use hover for the description of the existing attributes
+	// For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"name": "C# - Demo: Linked List",
+			"type": "coreclr",
+			"request": "launch",
+			"preLaunchTask": "csharp-build",
+			"program": "${workspaceFolder}/bin/Debug/netcoreapp3.1/demo.dll",
+			"args": [],
+			"cwd": "${workspaceFolder}",
+			"console": "internalConsole",
+			"stopAtEntry": false
+		}
+	]
+}

demos/csharp/.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+	"debugVisualizer.debugAdapterConfigurations": {}
+}

demos/csharp/.vscode/tasks.json

@@ -1,21 +1,6 @@
 {
 	"version": "2.0.0",
 	"tasks": [
-		{
-			"type": "npm",
-			"label": "typescript-watch",
-			"script": "dev",
-			"problemMatcher": "$tsc-watch",
-			"isBackground": true,
-			"presentation": {
-				"reveal": "never"
-			},
-			"path": "js/",
-			"group": {
-				"kind": "build",
-				"isDefault": true
-			}
-		},
 		{
 			"label": "csharp-build",
 			"command": "dotnet",

demos/golang/.vscode/launch.json

@@ -0,0 +1,21 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}",
+            "env": {},
+            "args": [],
+            "dlvLoadConfig": {
+                "followPointers": true,
+                "maxVariableRecurse": 1,
+                "maxStringLen": 5000,
+                "maxArrayValues": 64,
+                "maxStructFields": -1
+            }
+        }
+    ]
+}

demos/golang/demo.go

@@ -0,0 +1,91 @@
+package main
+
+import (
+	"encoding/json"
+	"math/rand"
+	"strconv"
+	"time"
+)
+
+// If you want to visualize large data structures,
+// you need to increase Delve's maxStringLen.
+// (See here https://github.com/microsoft/vscode-go/issues/868 for more info)
+// You can do this by adding the following configuration to your launch.json:
+// "dlvLoadConfig": {
+//     "followPointers": true,
+//     "maxVariableRecurse": 1,
+//     "maxStringLen": 5000,
+//     "maxArrayValues": 64,
+//     "maxStructFields": -1
+// }
+// For debugging tests, you can set the maxStringLen in settings.json like this:
+// "go.delveConfig": {
+//     "dlvLoadConfig": {
+//         "followPointers": true,
+//         "maxVariableRecurse": 1,
+//         "maxStringLen": 5000,
+//         "maxArrayValues": 64,
+//         "maxStructFields": -1
+//     },
+//     "apiVersion": 2,
+//     "showGlobalVariables": true
+// }
+
+// Open a new Debug Visualizer and visualize "s"
+func main() {
+	rand.Seed(time.Now().UnixNano())
+	graph := NewGraph()
+	var s string
+	for i := 0; i < 100; i++ {
+		id := strconv.Itoa(i)
+		graph.Nodes = append(graph.Nodes, NodeGraphData{
+			ID:    id,
+			Label: id,
+		})
+		if i > 0 {
+			targetId := rand.Intn(i)
+			graph.Edges = append(graph.Edges, EdgeGraphData{
+				From: id,
+				To:   strconv.Itoa(targetId),
+			})
+		}
+		s = graph.toString()
+		_ = s
+		//fmt.Printf("%s", s)
+	}
+}
+
+type Graph struct {
+	Kind  map[string]bool `json:"kind"`
+	Nodes []NodeGraphData `json:"nodes"`
+	Edges []EdgeGraphData `json:"edges"`
+}
+
+type NodeGraphData struct {
+	ID    string `json:"id"`
+	Label string `json:"label,omitempty"`
+	Color string `json:"color,omitempty"`
+	Shape string `json:"shape,omitempty"`
+}
+
+type EdgeGraphData struct {
+	From   string `json:"from"`
+	To     string `json:"to"`
+	Label  string `json:"label,omitempty"`
+	ID     string `json:"id"`
+	Color  string `json:"color,omitempty"`
+	Dashes bool   `json:"dashes,omitempty"`
+}
+
+func NewGraph() *Graph {
+	return &Graph{
+		Kind:  map[string]bool{"graph": true},
+		Nodes: []NodeGraphData{},
+		Edges: []EdgeGraphData{},
+	}
+}
+
+func (this *Graph) toString() string {
+	rs, _ := json.Marshal(this)
+	return string(rs)
+}

demos/golang/go.mod

@@ -0,0 +1,3 @@
+module demo
+
+go 1.13

demos/java/.gitignore

@@ -20,4 +20,6 @@
 *.rar
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+hs_err_pid*
+
+!lib/**

demos/java/.vscode/launch.json

@@ -0,0 +1,20 @@
+{
+	// Use IntelliSense to find out which attributes exist for C# debugging
+	// Use hover for the description of the existing attributes
+	// For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "java",
+			"name": "CodeLens (Launch) - DemoLinkedLists",
+			"request": "launch",
+			"mainClass": "DemoLinkedLists"
+		},
+		{
+			"name": "Java - Demo",
+			"type": "java",
+			"request": "launch",
+			"projectName": "java"
+		}
+	]
+}

demos/java/.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+	"java.dependency.packagePresentation": "flat",
+	"java.dependency.syncWithFolderExplorer": true,
+	"debugVisualizer.debugAdapterConfigurations": {}
+}

demos/js/.vscode/tasks.json

@@ -0,0 +1,18 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "npm",
+			"script": "dev",
+			"problemMatcher": "$tsc-watch",
+			"isBackground": true,
+			"presentation": {
+				"reveal": "never"
+			},
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		}
+	]
+}

demos/js/src/demo_typescript-asts.ts

@@ -65,12 +65,6 @@ class Test1 {
 		};
 		console.log("myValue is AST, annotated with symbol information");
 		debugger;
-
-		for (const ident of identifiers) {
-			myValue = ident;
-			console.log("myValue is an identifier");
-			debugger;
-		}
 	}
 }
 

demos/php/.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+	// Use IntelliSense to find out which attributes exist for C# debugging
+	// Use hover for the description of the existing attributes
+	// For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"name": "PHP - Demo",
+			"type": "php",
+			"request": "launch",
+			"program": "${workspaceFolder}/demo.php",
+			"xdebugSettings": {
+				"max_data": -1
+			}
+		}
+	]
+}

demos/php/.vscode/settings.json

@@ -1,6 +1,4 @@
 {
-	"debugVisualizer.useChromeKioskMode": false,
-	"editor.minimap.enabled": false,
 	"debugVisualizer.debugAdapterConfigurations": {
 		"php": {
 			"context": "watch",

demos/python/.vscode/launch.json

@@ -0,0 +1,7 @@
+{
+	// Use IntelliSense to find out which attributes exist for C# debugging
+	// Use hover for the description of the existing attributes
+	// For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+	"version": "0.2.0",
+	"configurations": []
+}

demos/rust/.gitignore

@@ -0,0 +1,10 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk

demos/rust/.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug",
+            "program": "${workspaceFolder}/target/debug/rust_demo",
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}

demos/rust/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "rust_demo"
+version = "0.1.0"
+authors = ["hediet"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"

demos/rust/src/main.rs

@@ -0,0 +1,89 @@
+use serde::Serialize;
+
+#[derive(Debug, Serialize)]
+struct Label {
+    label: Option<String>,
+}
+#[derive(Debug, Serialize)]
+struct Row {
+    label: Option<String>,
+    columns: Vec<Column>,
+}
+#[derive(Debug, Serialize)]
+struct Column {
+    content: Option<String>,
+    tag: Option<String>,
+    color: Option<String>,
+}
+#[derive(Debug, Serialize)]
+struct Marker {
+    id: String,
+    row: u64,
+    column: u64,
+    rows: Option<u64>,
+    columns: Option<u64>,
+    label: Option<String>,
+    color: Option<String>,
+}
+
+#[allow(clippy::trivially_copy_pass_by_ref)]
+fn is_false(b: &bool) -> bool {
+    !*b
+}
+
+#[derive(Debug, Serialize)]
+struct Kind {
+    #[serde(skip_serializing_if = "is_false")]
+    array: bool,
+}
+
+#[derive(Debug, Serialize)]
+pub struct Grid {
+    kind: Kind,
+    #[serde(rename = "columnLabels")]
+    column_labels: Option<Vec<Label>>,
+    rows: Vec<Row>,
+    markers: Option<Vec<Marker>>,
+}
+
+fn show_arr(a: &[i32]) -> String {
+    let n = a.len();
+    let labels: Vec<Label> = (0..n)
+        .map(|i| Label {
+            label: Some(i.to_string()),
+        })
+        .collect();
+    let columns: Vec<Column> = a
+        .iter()
+        .map(|x| Column {
+            content: Some(format!("{:?}", x)),
+            tag: Some(x.to_string()),
+            color: None,
+        })
+        .collect();
+    let row = Row {
+        label: None,
+        columns,
+    };
+    let kind = Kind { array: true };
+
+    let grid = Grid {
+        kind,
+        column_labels: Some(labels),
+        rows: vec![row],
+        markers: None,
+    };
+
+    serde_json::to_string(&grid).unwrap()
+}
+
+fn main() {
+    let mut arr = vec![1, 2, 3];
+    let mut _s = show_arr(&arr);
+    for _ in 0..5 {
+        arr.swap(0, 2); // break point
+        _s = show_arr(&arr);
+    }
+    dbg!(arr); // break point
+    println!("Hello, world!");
+}

demos/swift/.gitignore

@@ -0,0 +1,5 @@
+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/

demos/swift/.vscode/launch.json

@@ -0,0 +1,16 @@
+// .vscode/launch.json
+{
+	"version": "0.2.0",
+	"configurations": [
+		// Running executables
+		{
+			"type": "lldb",
+			"request": "launch",
+			"name": "Run your Executable",
+			"program": "${workspaceFolder}/.build/debug/swiftDemo",
+			"args": [],
+			"cwd": "${workspaceFolder}",
+			"preLaunchTask": "swift-build"
+		}
+	]
+}

demos/swift/.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+	// You need to adapt this path to your swift installation.
+	// See here for more info:
+	// https://github.com/vadimcn/vscode-lldb/issues/234
+	"lldb.library": "/home/hediet/swift-5.1.5-RELEASE-ubuntu14.04/usr/lib/liblldb.so"
+}

demos/swift/.vscode/tasks.json

@@ -0,0 +1,23 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		// compile your SPM project
+		{
+			"label": "swift-build",
+			"type": "shell",
+			"command": "swift build" // for TensorFlow add -Xlinker -ltensorflow
+		},
+		// compile your SPM tests
+		{
+			"label": "swift-build-tests",
+			"type": "process",
+			"command": "swift",
+			"group": "build",
+			"args": [
+				"build",
+				"--build-tests"
+				// for TensorFlow add "-Xlinker", "-ltensorflow"
+			]
+		}
+	]
+}

demos/swift/Package.swift

@@ -0,0 +1,22 @@
+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "swiftDemo",
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "swiftDemo",
+            dependencies: []),
+        .testTarget(
+            name: "swiftDemoTests",
+            dependencies: ["swiftDemo"]),
+    ]
+)

demos/swift/Sources/swiftDemo/main.swift

@@ -0,0 +1,5 @@
+let s = "{\"kind\":{\"graph\":true},"
+        + "\"nodes\":[{\"id\":\"1\"},{\"id\":\"2\"}],"
+        + "\"edges\":[{\"from\":\"1\",\"to\":\"2\"}]}";
+
+print(s)

demos/swift/Tests/LinuxMain.swift

@@ -0,0 +1,7 @@
+import XCTest
+
+import swiftTests
+
+var tests = [XCTestCaseEntry]()
+tests += swiftTests.allTests()
+XCTMain(tests)

demos/swift/Tests/swiftDemoTests/XCTestManifests.swift

@@ -0,0 +1,9 @@
+import XCTest
+
+#if !canImport(ObjectiveC)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(swiftTests.allTests),
+    ]
+}
+#endif

demos/swift/Tests/swiftDemoTests/swiftDemoTests.swift

@@ -0,0 +1,47 @@
+import XCTest
+import class Foundation.Bundle
+
+final class swiftTests: XCTestCase {
+    func testExample() throws {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+
+        // Some of the APIs that we use below are available in macOS 10.13 and above.
+        guard #available(macOS 10.13, *) else {
+            return
+        }
+
+        let fooBinary = productsDirectory.appendingPathComponent("swift")
+
+        let process = Process()
+        process.executableURL = fooBinary
+
+        let pipe = Pipe()
+        process.standardOutput = pipe
+
+        try process.run()
+        process.waitUntilExit()
+
+        let data = pipe.fileHandleForReading.readDataToEndOfFile()
+        let output = String(data: data, encoding: .utf8)
+
+        XCTAssertEqual(output, "Hello, world!\n")
+    }
+
+    /// Returns path to the built products directory.
+    var productsDirectory: URL {
+      #if os(macOS)
+        for bundle in Bundle.allBundles where bundle.bundlePath.hasSuffix(".xctest") {
+            return bundle.bundleURL.deletingLastPathComponent()
+        }
+        fatalError("couldn't find the products directory")
+      #else
+        return Bundle.main.bundleURL
+      #endif
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

demos/swift/main.swift

@@ -0,0 +1,2 @@
+import Swift
+print("Hello, World!")

docs/main.plantuml

@@ -3,10 +3,16 @@
 [data-extraction] 
 [webview]
 [extension]
+[visualization]
+[visualization-playground]
 
 [webview] ..> [extension]: "Uses RPC contracts, connects using websockets"
 [extension] ..> [webview]: "Loads into a Webview in VS Code"
 
+[webview] ..> [visualization]: "Uses React Components"
+
+[visualization-playground] ..> [visualization]: "Uses React Components"
+
 [extension] ..> [data-extraction]: "Injects Runtime into JavaScript applications"
 
 [webview] ..> [data-extraction]: "Uses common types"

extension/CHANGELOG.md

@@ -1,5 +1,23 @@
 # Change Log
 
+## 1.0.0
+
+-   "Debug Visualizer: Use Selection as Expression" will open a new view if no Debug Visualizer view was opened.
+-   Enables type based autocompletion in the input field when debugging JavaScript/TypeScript.
+-   Changes license from MIT to GPL-3.0.
+-   Fixes bug where loading animation didn't stop.
+-   Catches visualization errors rather than letting the entire webview crash.
+
+## 0.14.0
+
+-   Submits the expression when the expression input loses focus.
+-   Changes text of command "Open a new Debug Visualizer View" to "Debug Visualizer: New View".
+-   Adds command "Debug Visualizer: Use Selection as Expression" (Shift+F1)
+-   Optimizes load time by splitting code into multiple bundles.
+-   Fixes monaco load errors.
+-   Sets the mode of the expression input to text rather than typescript, as this extension supports multiple languages.
+-   Improves error messages.
+
 ## 0.13.0
 
 -   Adds "debugVisualizer.debugAdapterConfigurations" config to customize the expression template.

extension/README.md

@@ -4,19 +4,37 @@
 
 A VS Code extension for visualizing data structures while debugging.
 
-Works best with JavaScript/TypeScript.
-Also tested with C#, Java and PHP. Works with any language that you can debug in VS Code.
-
 ![](../docs/demo.gif)
 
+## Supported Languages
+
+See [demos](./demos/) for demos. These languages and debuggers are verified to work with this extension:
+
+-   JavaScript/TypeScript/... using `node`/`node2`/`extensionHost` or `chrome` debug adapter: [⭐ Full Support](../demos/js)
+-   Go using `go` (Delve) debug adapter: [✅ Rudimentary Support](../demos/golang)
+-   Python using `python` debug adapter: [✅ Rudimentary Support](../demos/python)
+-   C# using `coreclr` debug adapter: [✅ Rudimentary Support](../demos/csharp)
+-   PHP using `php` debug adapter: [✅ Rudimentary Support](../demos/php)
+-   Java using `java` debug adapter: [✅ Rudimentary Support](../demos/java)
+-   C++ using `cppdbg` debug adapter: [✅ Rudimentary Support](../demos/cpp)
+-   Swift using `lldb` debug adapter: [✅ Rudimentary Support](../demos/swift)
+-   Rust using `lldb` debug adapter: [✅ Rudimentary Support](../demos/rust)
+
+All other languages and debuggers might work too.
+For languages with _Rudimentary Support_, only JSON strings can be visualized - you must implement some logic that builds this JSON for your data structure!
+Fully supported languages offer _Data Extractors_ which convert some well known data structures to json.
+
 ## Usage
 
-After installing this extension, use the command `Open a new Debug Visualizer View` to open a new visualizer view.
+After installing this extension, use the command `Debug Visualizer: New View` to open a new visualizer view.
 In this view you can enter an expression that is evaluated and visualized while stepping through your application.
 
 You can refresh the evaluation and pop out the current visualizer view into a new browser window by using the top right buttons.
 You can also unfold the details pane to select a _Data Extractor_ and a _Visualizer_.
 
+Use the command `Debug Visualizer: Use Selection as Expression` (Shift + F1) to use the currently selected text as expression
+in the most recently opened debug visualizer.
+
 ## Supported Values
 
 Visualizers consume specific JSON data. See [Integrated Visualizers](#Integrated%20Visualizers) for the schema of supported JSON data.
@@ -36,6 +54,7 @@ The following visualizers are built into this extension.
 
 ### Graph Visualization
 
+[Demo](https://hediet.github.io/vscode-debug-visualizer/?value=%7B%0A++++%22kind%22%3A+%7B+%22graph%22%3A+true+%7D%2C%0A++++%22nodes%22%3A+%5B%0A++++++++%7B+%22id%22%3A+%221%22%2C+%22label%22%3A+%221%22+%7D%2C%0A++++++++%7B+%22id%22%3A+%222%22%2C+%22label%22%3A+%222%22%2C+%22color%22%3A+%22orange%22+%7D%2C%0A++++++++%7B+%22id%22%3A+%223%22%2C+%22label%22%3A+%223%22+%7D%0A++++%5D%2C%0A++++%22edges%22%3A+%5B%0A++++++++%7B+%22from%22%3A+%221%22%2C+%22to%22%3A+%222%22%2C+%22color%22%3A+%22red%22+%7D%2C%0A++++++++%7B+%22from%22%3A+%221%22%2C+%22to%22%3A+%223%22+%7D%0A++++%5D%0A%7D).
 The Graphviz and vis.js visualizers render data that matches the `Graph` interface.
 
 ```ts
@@ -69,6 +88,7 @@ The graphviz visualizer uses the SVG viewer to render the SVG created by `viz.js
 
 ### Plotly Visualization
 
+[Demo](https://hediet.github.io/vscode-debug-visualizer/?value=%7B%22kind%22%3A%7B%22plotly%22%3Atrue%7D%2C%22data%22%3A%5B%7B%22y%22%3A%5B0%2C1%2C2%2C3%2C4%2C3%2C4%2C3%2C2%2C1%2C2%5D%7D%5D%7D).
 The plotly visualizer uses plotly and can visualize JSON data matching the following interface:
 
 ```ts
@@ -105,6 +125,7 @@ interface TreeNode<TExtraData> {
 
 ### AST Visualization
 
+[Demo](https://hediet.github.io/vscode-debug-visualizer/?value=%7B%22kind%22%3A%7B%22text%22%3Atrue%2C%22tree%22%3Atrue%2C%22ast%22%3Atrue%7D%2C%22root%22%3A%7B%22name%22%3A%22SourceFile%22%2C%22id%22%3A%22root%22%2C%22children%22%3A%5B%7B%22name%22%3A%22ClassDeclaration%22%2C%22id%22%3A%22statements%22%2C%22children%22%3A%5B%7B%22name%22%3A%22Identifier%22%2C%22id%22%3A%22name%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A6%2C%22position%22%3A6%7D%2C%22isMarked%22%3Afalse%2C%22value%22%3A%22Test1%22%7D%2C%7B%22name%22%3A%22MethodDeclaration%22%2C%22id%22%3A%22members%22%2C%22children%22%3A%5B%7B%22name%22%3A%22PublicKeyword%22%2C%22id%22%3A%22modifiers%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A8%2C%22position%22%3A14%7D%2C%22isMarked%22%3Afalse%7D%2C%7B%22name%22%3A%22Identifier%22%2C%22id%22%3A%22name%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A4%2C%22position%22%3A22%7D%2C%22isMarked%22%3Afalse%2C%22value%22%3A%22foo%22%7D%2C%7B%22name%22%3A%22Parameter%22%2C%22id%22%3A%22parameters%22%2C%22children%22%3A%5B%7B%22name%22%3A%22Identifier%22%2C%22id%22%3A%22name%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A1%2C%22position%22%3A27%7D%2C%22isMarked%22%3Afalse%2C%22value%22%3A%22a%22%7D%2C%7B%22name%22%3A%22NumberKeyword%22%2C%22id%22%3A%22type%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A7%2C%22position%22%3A29%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A9%2C%22position%22%3A27%7D%2C%22isMarked%22%3Afalse%7D%2C%7B%22name%22%3A%22Block%22%2C%22id%22%3A%22body%22%2C%22children%22%3A%5B%7B%22name%22%3A%22VariableStatement%22%2C%22id%22%3A%22statements%22%2C%22children%22%3A%5B%7B%22name%22%3A%22VariableDeclarationList%22%2C%22id%22%3A%22declarationList%22%2C%22children%22%3A%5B%7B%22name%22%3A%22VariableDeclaration%22%2C%22id%22%3A%22declarations%22%2C%22children%22%3A%5B%7B%22name%22%3A%22Identifier%22%2C%22id%22%3A%22name%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A2%2C%22position%22%3A47%7D%2C%22isMarked%22%3Afalse%2C%22value%22%3A%22x%22%7D%2C%7B%22name%22%3A%22ObjectLiteralExpression%22%2C%22id%22%3A%22initializer%22%2C%22children%22%3A%5B%7B%22name%22%3A%22PropertyAssignment%22%2C%22id%22%3A%22properties%22%2C%22children%22%3A%5B%7B%22name%22%3A%22Identifier%22%2C%22id%22%3A%22name%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A2%2C%22position%22%3A53%7D%2C%22isMarked%22%3Afalse%2C%22value%22%3A%22a%22%7D%2C%7B%22name%22%3A%22FirstLiteralToken%22%2C%22id%22%3A%22initializer%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A2%2C%22position%22%3A56%7D%2C%22isMarked%22%3Afalse%2C%22value%22%3A%225%22%7D%5D%2C%22data%22%3A%7B%22length%22%3A5%2C%22position%22%3A53%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A9%2C%22position%22%3A51%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A13%2C%22position%22%3A47%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A21%2C%22position%22%3A39%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A22%2C%22position%22%3A39%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A27%2C%22position%22%3A37%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A50%2C%22position%22%3A14%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A66%2C%22position%22%3A0%7D%2C%22isMarked%22%3Afalse%7D%2C%7B%22name%22%3A%22EndOfFileToken%22%2C%22id%22%3A%22endOfFileToken%22%2C%22children%22%3A%5B%5D%2C%22data%22%3A%7B%22length%22%3A1%2C%22position%22%3A66%7D%2C%22isMarked%22%3Afalse%7D%5D%2C%22data%22%3A%7B%22length%22%3A67%2C%22position%22%3A0%7D%2C%22isMarked%22%3Atrue%7D%2C%22text%22%3A%22%5Cnclass+Test1+%7B%5Cn%5Ctpublic+foo%28a%3A+number%29+%7B%5Cn%5Ct%5Ctconst+x+%3D+%7B+a%3A+5+%7D%3B%5Cn%5Ct%7D%5Cn%7D%5Cn%22%2C%22fileName%22%3A%22index.ts%22%7D).
 The AST (Abstract Syntax Tree) visualizer renders data that matches the `Ast` interface.
 
 ```ts

extension/package.json

@@ -4,8 +4,8 @@
 	"displayName": "Debug Visualizer",
 	"description": "An extension that visualizes values while debugging.",
 	"icon": "docs/logo.png",
-	"version": "0.13.0",
-	"license": "MIT",
+	"version": "1.0.0",
+	"license": "GPL-3.0",
 	"engines": {
 		"vscode": "^1.35.0"
 	},
@@ -24,6 +24,7 @@
 	],
 	"activationEvents": [
 		"onCommand:vscode-debug-visualizer.new-visualizer",
+		"onCommand:vscode-debug-visualizer.visualizer-set-expression",
 		"onDebug",
 		"onWebviewPanel:debugVisualizer"
 	],
@@ -32,7 +33,18 @@
 		"commands": [
 			{
 				"command": "vscode-debug-visualizer.new-visualizer",
-				"title": "Open a new Debug Visualizer View"
+				"title": "Debug Visualizer: New View"
+			},
+			{
+				"command": "vscode-debug-visualizer.visualizer-set-expression",
+				"title": "Debug Visualizer: Use Selection as Expression"
+			}
+		],
+		"keybindings": [
+			{
+				"command": "vscode-debug-visualizer.visualizer-set-expression",
+				"key": "shift+f1",
+				"when": "editorTextFocus"
 			}
 		],
 		"configuration": {

extension/src/ClientConnection.ts

@@ -1,7 +1,10 @@
 import { Disposable } from "@hediet/std/disposable";
 import { debugVisualizerUIContract } from "./contract";
 import { ConsoleRpcLogger, RequestHandlingError } from "@hediet/typed-json-rpc";
-import { EvaluationWatcher, DataSource } from "./DataSource/DataSource";
+import {
+	EvaluationWatcher,
+	EvaluationWatchService,
+} from "./EvaluationWatchService";
 import { WebSocketStream } from "@hediet/typed-json-rpc-websocket";
 import { observable, autorun } from "mobx";
 import { Server } from "./Server";
@@ -9,13 +12,15 @@ import * as open from "open";
 import chromeLauncher = require("chrome-launcher");
 import { Config } from "./Config";
 
-export class ConnectionHandler {
+export class ClientConnection {
 	public readonly dispose = Disposable.fn();
 	@observable
 	private watcher: EvaluationWatcher | undefined = undefined;
 
+	private readonly client: typeof debugVisualizerUIContract["TClientInterface"];
+
 	constructor(
-		dataSource: DataSource,
+		evaluationWatchService: EvaluationWatchService,
 		stream: WebSocketStream,
 		server: Server,
 		config: Config,
@@ -60,9 +65,12 @@ export class ConnectionHandler {
 						this.dispose.untrack(this.watcher).dispose();
 					}
 					this.watcher = this.dispose.track(
-						dataSource.createEvaluationWatcher(newExpression, {
-							preferredDataExtractor: oldPreferredDataExtractor,
-						})
+						evaluationWatchService.createEvaluationWatcher(
+							newExpression,
+							{
+								preferredDataExtractor: oldPreferredDataExtractor,
+							}
+						)
 					);
 				},
 				openInBrowser: async ({}) => {
@@ -93,7 +101,7 @@ export class ConnectionHandler {
 				getCompletions: async ({ text, column }) => {
 					throwIfNotAuthenticated();
 
-					const completions = await dataSource.getCompletions(
+					const completions = await evaluationWatchService.getCompletions(
 						text,
 						column
 					);
@@ -104,7 +112,9 @@ export class ConnectionHandler {
 			}
 		);
 
-		this.dispose.track(
+		this.client = client;
+
+		this.dispose.track([
 			Disposable.create(
 				autorun(() => {
 					if (this.watcher) {
@@ -113,13 +123,24 @@ export class ConnectionHandler {
 						});
 					}
 				})
-			)
-		);
+			),
+			Disposable.create(
+				autorun(() => {
+					client.updateLanguageId({
+						languageId: evaluationWatchService.languageId || null,
+					});
+				})
+			),
+		]);
 
 		stream.onClosed.then(() => {
 			this.dispose();
 		});
 	}
+
+	public setExpression(expression: string) {
+		this.client.setExpression({ expression });
+	}
 }
 
 async function launchChrome(url: string): Promise<boolean> {

extension/src/DataSource/DataExtractionProvider/ComposedDataExtractionProviderFactory.ts

@@ -1,22 +0,0 @@
-import {
-	DataExtractionProviderFactory,
-	DataExtractionProvider,
-} from "./DataExtractionProvider";
-import { VsCodeDebugSession } from "../../VsCodeDebugger";
-
-export class ComposedDataExtractionProviderFactory
-	implements DataExtractionProviderFactory {
-	constructor(public readonly factories: DataExtractionProviderFactory[]) {}
-
-	createDataExtractionProvider(
-		session: VsCodeDebugSession
-	): DataExtractionProvider | undefined {
-		for (const f of this.factories) {
-			const provider = f.createDataExtractionProvider(session);
-			if (provider) {
-				return provider;
-			}
-		}
-		return undefined;
-	}
-}

extension/src/DataSource/DataExtractionProvider/DataExtractionProvider.ts

@@ -1,26 +0,0 @@
-import {
-	DataExtractionResult,
-	DataExtractorId,
-} from "@hediet/debug-visualizer-data-extraction";
-import { VsCodeDebugSession } from "../../VsCodeDebugger";
-
-export interface DataExtractionProviderFactory {
-	createDataExtractionProvider(
-		session: VsCodeDebugSession
-	): DataExtractionProvider | undefined;
-}
-
-export interface DataExtractionProvider {
-	evaluate(
-		args: DataExtractionProviderArgs
-	): Promise<
-		| { kind: "data"; result: DataExtractionResult }
-		| { kind: "error"; message: string }
-	>;
-}
-
-export interface DataExtractionProviderArgs {
-	expression: string;
-	preferredExtractorId: DataExtractorId | undefined;
-	frameId: number | undefined;
-}

extension/src/DataSource/DataExtractionProvider/index.ts

@@ -1,6 +0,0 @@
-export * from "./DataExtractionProvider";
-
-export { ComposedDataExtractionProviderFactory } from "./ComposedDataExtractionProviderFactory";
-export { JsDataExtractionProviderFactory } from "./JsDataExtractionProviderFactory";
-export { GenericDataExtractionProviderFactory } from "./GenericDataExtractionProviderFactory";
-export { ConfiguredDataExtractionProviderFactory } from "./ConfiguredDataExtractionProviderFactory";

extension/src/DataSource/index.ts

@@ -1 +0,0 @@
-export * from "./DataSourceImpl";

extension/src/EvaluationWatchService/EvaluationEngine/ComposedEvaluationEngine.ts

@@ -0,0 +1,16 @@
+import { EvaluationEngine, Evaluator } from "./EvaluationEngine";
+import { VsCodeDebugSession } from "../../VsCodeDebugger";
+
+export class ComposedEvaluationEngine implements EvaluationEngine {
+	constructor(public readonly engines: EvaluationEngine[]) {}
+
+	createEvaluator(session: VsCodeDebugSession): Evaluator | undefined {
+		for (const f of this.engines) {
+			const evaluator = f.createEvaluator(session);
+			if (evaluator) {
+				return evaluator;
+			}
+		}
+		return undefined;
+	}
+}

extension/src/EvaluationWatchService/EvaluationEngine/ConfiguredEvaluationEngine.ts

@@ -1,28 +1,26 @@
 import { DataExtractorId } from "@hediet/debug-visualizer-data-extraction";
 import { VsCodeDebugSession } from "../../VsCodeDebugger";
-import {
-	DataExtractionProviderFactory,
-	DataExtractionProvider,
-} from "./DataExtractionProvider";
+import { EvaluationEngine, Evaluator } from "./EvaluationEngine";
 import { Config, DebugAdapterConfig } from "../../Config";
-import { GenericDataExtractionProvider } from "./GenericDataExtractionProviderFactory";
+import { GenericEvaluator } from "./GenericEvaluationEngine";
+import { registerUpdateReconciler, hotClass } from "@hediet/node-reload";
 
-export class ConfiguredDataExtractionProviderFactory
-	implements DataExtractionProviderFactory {
+registerUpdateReconciler(module);
+
+@hotClass(module)
+export class ConfiguredEvaluationEngine implements EvaluationEngine {
 	constructor(private readonly config: Config) {}
 
-	createDataExtractionProvider(
-		session: VsCodeDebugSession
-	): DataExtractionProvider | undefined {
+	createEvaluator(session: VsCodeDebugSession): Evaluator | undefined {
 		const config = this.config.getDebugAdapterConfig(session.session.type);
 		if (!config) {
 			return undefined;
 		}
-		return new ConfiguredDataExtractionProvider(session, config);
+		return new ConfiguredEvaluator(session, config);
 	}
 }
 
-class ConfiguredDataExtractionProvider extends GenericDataExtractionProvider {
+class ConfiguredEvaluator extends GenericEvaluator {
 	constructor(
 		session: VsCodeDebugSession,
 		private readonly config: DebugAdapterConfig

extension/src/EvaluationWatchService/EvaluationEngine/EvaluationEngine.ts

@@ -0,0 +1,30 @@
+import {
+	DataExtractionResult,
+	DataExtractorId,
+} from "@hediet/debug-visualizer-data-extraction";
+import { VsCodeDebugSession } from "../../VsCodeDebugger";
+import { FormattedMessage } from "../../contract";
+
+export interface EvaluationEngine {
+	createEvaluator(session: VsCodeDebugSession): Evaluator | undefined;
+}
+
+export interface Evaluator {
+	evaluate(
+		args: EvaluationArgs
+	): Promise<
+		| { kind: "data"; result: DataExtractionResult }
+		| { kind: "error"; message: FormattedMessage }
+	>;
+
+	/**
+	 * The language that expressions must be written in.
+	 */
+	readonly languageId: string | undefined;
+}
+
+export interface EvaluationArgs {
+	expression: string;
+	preferredExtractorId: DataExtractorId | undefined;
+	frameId: number | undefined;
+}

extension/src/EvaluationWatchService/EvaluationEngine/GenericEvaluationEngine.ts

@@ -4,31 +4,35 @@ import {
 } from "@hediet/debug-visualizer-data-extraction";
 import { VsCodeDebugSession } from "../../VsCodeDebugger";
 import {
-	DataExtractionProviderFactory,
-	DataExtractionProvider,
-	DataExtractionProviderArgs,
-} from "./DataExtractionProvider";
+	EvaluationEngine,
+	Evaluator,
+	EvaluationArgs,
+} from "./EvaluationEngine";
 import { parseEvaluationResultFromGenericDebugAdapter } from "./parseEvaluationResultFromGenericDebugAdapter";
+import { FormattedMessage } from "../../contract";
+import { hotClass, registerUpdateReconciler } from "@hediet/node-reload";
 
-export class GenericDataExtractionProviderFactory
-	implements DataExtractionProviderFactory {
-	createDataExtractionProvider(
-		session: VsCodeDebugSession
-	): DataExtractionProvider | undefined {
-		return new GenericDataExtractionProvider(session);
+registerUpdateReconciler(module);
+
+@hotClass(module)
+export class GenericEvaluationEngine implements EvaluationEngine {
+	createEvaluator(session: VsCodeDebugSession): Evaluator | undefined {
+		return new GenericEvaluator(session);
 	}
 }
 
-export class GenericDataExtractionProvider implements DataExtractionProvider {
+export class GenericEvaluator implements Evaluator {
+	public readonly languageId = "text";
+
 	constructor(private readonly session: VsCodeDebugSession) {}
 
 	public async evaluate({
 		expression,
 		preferredExtractorId,
 		frameId,
-	}: DataExtractionProviderArgs): Promise<
+	}: EvaluationArgs): Promise<
 		| { kind: "data"; result: DataExtractionResult }
-		| { kind: "error"; message: string }
+		| { kind: "error"; message: FormattedMessage }
 	> {
 		const finalExpression = this.getFinalExpression({
 			expression,
@@ -44,7 +48,20 @@ export class GenericDataExtractionProvider implements DataExtractionProvider {
 		} catch (error) {
 			return {
 				kind: "error",
-				message: error.message,
+				message: {
+					kind: "list",
+					items: [
+						error.message,
+						`Used debug adapter: ${this.session.session.configuration.type}`,
+						{
+							kind: "inlineList",
+							items: [
+								"Evaluated expression is",
+								{ kind: "code", content: finalExpression },
+							],
+						},
+					],
+				},
 			};
 		}
 

extension/src/EvaluationWatchService/EvaluationEngine/JsEvaluationEngine.ts

@@ -7,16 +7,18 @@ import {
 } from "@hediet/debug-visualizer-data-extraction";
 import { VsCodeDebugSession } from "../../VsCodeDebugger";
 import {
-	DataExtractionProviderFactory,
-	DataExtractionProvider,
-	DataExtractionProviderArgs,
-} from "./DataExtractionProvider";
+	EvaluationEngine,
+	Evaluator,
+	EvaluationArgs,
+} from "./EvaluationEngine";
+import { FormattedMessage } from "../../contract";
+import { registerUpdateReconciler, hotClass } from "@hediet/node-reload";
 
-export class JsDataExtractionProviderFactory
-	implements DataExtractionProviderFactory {
-	createDataExtractionProvider(
-		session: VsCodeDebugSession
-	): DataExtractionProvider | undefined {
+registerUpdateReconciler(module);
+
+@hotClass(module)
+export class JsEvaluationEngine implements EvaluationEngine {
+	createEvaluator(session: VsCodeDebugSession): Evaluator | undefined {
 		const supportedDebugAdapters = [
 			"node",
 			"node2",
@@ -24,22 +26,24 @@ export class JsDataExtractionProviderFactory
 			"chrome",
 		];
 		if (supportedDebugAdapters.indexOf(session.session.type) !== -1) {
-			return new JsDataEvaluator(session);
+			return new JsEvaluator(session);
 		}
 		return undefined;
 	}
 }
 
-class JsDataEvaluator implements DataExtractionProvider {
+class JsEvaluator implements Evaluator {
+	public readonly languageId = "javascript";
+
 	constructor(private readonly session: VsCodeDebugSession) {}
 
 	public async evaluate({
 		expression,
 		preferredExtractorId,
 		frameId,
-	}: DataExtractionProviderArgs): Promise<
+	}: EvaluationArgs): Promise<
 		| { kind: "data"; result: DataExtractionResult }
-		| { kind: "error"; message: string }
+		| { kind: "error"; message: FormattedMessage }
 	> {
 		while (true) {
 			try {

extension/src/EvaluationWatchService/EvaluationEngine/index.ts

@@ -0,0 +1,6 @@
+export * from "./EvaluationEngine";
+
+export { ComposedEvaluationEngine } from "./ComposedEvaluationEngine";
+export { JsEvaluationEngine } from "./JsEvaluationEngine";
+export { GenericEvaluationEngine } from "./GenericEvaluationEngine";
+export { ConfiguredEvaluationEngine } from "./ConfiguredEvaluationEngine";

extension/src/EvaluationWatchService/EvaluationEngine/parseEvaluationResultFromGenericDebugAdapter.ts

@@ -2,12 +2,13 @@ import {
 	DataExtractionResult,
 	isExtractedData,
 } from "@hediet/debug-visualizer-data-extraction";
+import { FormattedMessage } from "../../contract";
 
 export function parseEvaluationResultFromGenericDebugAdapter(
 	resultText: string
 ):
 	| { kind: "data"; result: DataExtractionResult }
-	| { kind: "error"; message: string } {
+	| { kind: "error"; message: FormattedMessage } {
 	const jsonData = resultText.trim();
 
 	let resultObj;
@@ -37,7 +38,26 @@ export function parseEvaluationResultFromGenericDebugAdapter(
 		if (!isExtractedData(resultObj)) {
 			return {
 				kind: "error",
-				message: "Data does not match ExtractedData interface.",
+				message: {
+					kind: "list",
+					items: [
+						"Evaluation result does not match ExtractedData interface.",
+						{
+							kind: "inlineList",
+							items: [
+								"Evaluation result was:",
+								{
+									kind: "code",
+									content: JSON.stringify(
+										resultObj,
+										undefined,
+										4
+									),
+								},
+							],
+						},
+					],
+				},
 			};
 		}
 	} catch (e) {
@@ -69,8 +89,26 @@ function parseJson(str: string) {
 	try {
 		return JSON.parse(str);
 	} catch (error) {
-		throw new Error(
-			`Could not parse \`${str}\` as JSON.\n${error.message}`
-		);
+		throw new FormattedError({
+			kind: "list",
+			items: [
+				"Could not parse evaluation result as JSON:",
+				error.message,
+				{
+					kind: "inlineList",
+					items: [
+						"Evaluation result was:",
+						{
+							kind: "code",
+							content: str,
+						},
+					],
+				},
+			],
+		});
 	}
 }
+
+class FormattedError {
+	constructor(public readonly message: FormattedMessage) {}
+}

extension/src/EvaluationWatchService/EvaluationWatchService.ts

@@ -1,13 +1,20 @@
 import { DataExtractorId } from "@hediet/debug-visualizer-data-extraction";
 import { DataExtractionState, CompletionItem } from "../contract";
 
-export interface DataSource {
+export interface EvaluationWatchService {
 	createEvaluationWatcher(
 		expression: string,
 		options: EvaluationWatcherOptions
 	): EvaluationWatcher;
 
 	getCompletions(text: string, column: number): Promise<CompletionItem[]>;
+
+	/**
+	 * The language the expressions must be written in.
+	 * `undefined`, if unknown.
+	 * This field is observable.
+	 */
+	readonly languageId: string | undefined;
 }
 
 export interface EvaluationWatcherOptions {

extension/src/EvaluationWatchService/EvaluationWatchServiceImpl.ts

@@ -1,24 +1,24 @@
 import {
-	DataSource,
+	EvaluationWatchService,
 	EvaluationWatcher,
 	EvaluationWatcherOptions,
-} from "./DataSource";
+} from "./EvaluationWatchService";
 import { observable, autorun, action } from "mobx";
 import { Disposable } from "@hediet/std/disposable";
 import { DataExtractorId } from "@hediet/debug-visualizer-data-extraction";
 import { DataExtractionState, CompletionItem } from "../contract";
 import { hotClass } from "@hediet/node-reload";
 import { VsCodeDebuggerView } from "../VsCodeDebugger";
-import { DataExtractionProviderFactory } from "./DataExtractionProvider/DataExtractionProvider";
+import { EvaluationEngine } from "./EvaluationEngine/EvaluationEngine";
 
 @hotClass(module)
-export class DataSourceImpl implements DataSource {
+export class EvaluationWatchServiceImpl implements EvaluationWatchService {
 	public readonly dispose = Disposable.fn();
 	private readonly watchers = new Set<ObservableEvaluationWatcher>();
 
 	constructor(
 		private readonly vsCodeDebuggerView: VsCodeDebuggerView,
-		private readonly dataExtractionProviderFactory: DataExtractionProviderFactory
+		private readonly evaluationEngine: EvaluationEngine
 	) {
 		this.dispose.track({
 			dispose: autorun(() => {
@@ -48,6 +48,21 @@ export class DataSourceImpl implements DataSource {
 		this.watchers.delete(w);
 	}
 
+	private lastLanguageId: string | undefined = undefined;
+
+	get languageId(): string | undefined {
+		const session = this.vsCodeDebuggerView.activeDebugSession;
+		if (!session) {
+			return this.lastLanguageId;
+		}
+		const evaluator = this.evaluationEngine.createEvaluator(session);
+		if (!evaluator) {
+			return this.lastLanguageId;
+		}
+		this.lastLanguageId = evaluator.languageId;
+		return evaluator.languageId;
+	}
+
 	public async refresh(w: ObservableEvaluationWatcher): Promise<void> {
 		const session = this.vsCodeDebuggerView.activeDebugSession;
 		if (!session) {
@@ -59,10 +74,8 @@ export class DataSourceImpl implements DataSource {
 
 		w._state = { kind: "loading" };
 
-		const extractionProvider = this.dataExtractionProviderFactory.createDataExtractionProvider(
-			session
-		);
-		if (!extractionProvider) {
+		const evaluator = this.evaluationEngine.createEvaluator(session);
+		if (!evaluator) {
 			w._state = {
 				kind: "error",
 				message: `The debug adapter "${session.session.type}" is not supported.`,
@@ -70,7 +83,7 @@ export class DataSourceImpl implements DataSource {
 			return;
 		}
 
-		const result = await extractionProvider.evaluate({
+		const result = await evaluator.evaluate({
 			expression: w.expression,
 			frameId,
 			preferredExtractorId: w.preferredDataExtractor,
@@ -98,7 +111,7 @@ export class DataSourceImpl implements DataSource {
 class ObservableEvaluationWatcher implements EvaluationWatcher {
 	constructor(
 		public readonly expression: string,
-		private readonly source: DataSourceImpl,
+		private readonly source: EvaluationWatchServiceImpl,
 		options: EvaluationWatcherOptions
 	) {
 		this._preferredDataExtractor = options.preferredDataExtractor;

extension/src/EvaluationWatchService/index.ts

@@ -0,0 +1,2 @@
+export * from "./EvaluationWatchServiceImpl";
+export * from "./EvaluationWatchService";

extension/src/Server.ts

@@ -1,20 +1,22 @@
 import { WebSocketStream } from "@hediet/typed-json-rpc-websocket";
 import { AddressInfo } from "net";
 import WebSocket = require("ws");
-import { ConnectionHandler } from "./ConnectionHandler";
+import { ClientConnection } from "./ClientConnection";
 import * as express from "express";
 import * as http from "http";
 import * as serveStatic from "serve-static";
 import { Config } from "./Config";
 import cryptoRandomString = require("crypto-random-string");
 import { distPath } from "debug-visualizer-webview";
-import { DataSource } from "./DataSource/DataSource";
+import { EvaluationWatchService } from "./EvaluationWatchService/EvaluationWatchService";
 
 export class Server {
 	private server: http.Server;
 	public readonly secret = cryptoRandomString({ length: 20 });
 
-	constructor(dataSource: DataSource, config: Config) {
+	public readonly connections = new Set<ClientConnection>();
+
+	constructor(dataSource: EvaluationWatchService, config: Config) {
 		const app = express();
 
 		app.use(serveStatic(distPath));
@@ -28,15 +30,18 @@ export class Server {
 		);
 
 		const wss = new WebSocket.Server({ server: this.server });
-		wss.on("connection", ws => {
+		wss.on("connection", async ws => {
 			const stream = new WebSocketStream(ws);
-			new ConnectionHandler(
+			const c = new ClientConnection(
 				dataSource,
 				stream,
 				this,
 				config,
 				this.secret
 			);
+			this.connections.add(c);
+			await stream.onClosed;
+			this.connections.delete(c);
 		});
 	}
 
@@ -54,8 +59,12 @@ export class Server {
 		return `http://localhost:${port}/index.html?serverPort=${this.port}&serverSecret=${this.secret}${inWebView}${expr}`;
 	}
 
+	public get publicPath(): string {
+		return `http://localhost:${this.port}/`;
+	}
+
 	public get mainBundleUrl(): string {
-		return `http://localhost:${this.port}/main.js`;
+		return `${this.publicPath}main.js`;
 	}
 
 	public get port(): number {

extension/src/WebViews.ts

@@ -27,7 +27,7 @@ export class WebViews {
 		});
 	}
 
-	public createNew() {
+	public createNew(expression: string | undefined = undefined) {
 		const panel = window.createWebviewPanel(
 			debugVisualizer,
 			"Debug Visualizer",
@@ -35,15 +35,18 @@ export class WebViews {
 			{ enableScripts: true }
 		);
 
-		this.setupView(panel);
+		this.setupView(panel, expression);
 	}
 
 	public restore(webviewPanel: WebviewPanel) {
 		this.setupView(webviewPanel);
 	}
 
-	private setupView(webviewPanel: WebviewPanel) {
-		webviewPanel.webview.html = getHtml(this.server);
+	private setupView(
+		webviewPanel: WebviewPanel,
+		expression: string | undefined = undefined
+	) {
+		webviewPanel.webview.html = getHtml(this.server, expression);
 		const view = new WebView(webviewPanel);
 		this.debugVisualizations.set(webviewPanel, view);
 		webviewPanel.onDidDispose(() => {
@@ -56,13 +59,16 @@ export class WebView {
 	constructor(private readonly webviewPanel: WebviewPanel) {}
 }
 
-export function getHtml(server: Server) {
+export function getHtml(
+	server: Server,
+	expression: string | undefined = undefined
+) {
 	const isDev = !!process.env.USE_DEV_UI;
 	return `
         <html>
 			<head>
 			<meta charset="UTF-8">
-			<meta http-equiv="Content-Security-Policy" content="default-src * 'unsafe-inline' 'unsafe-eval'; script-src * 'unsafe-inline' 'unsafe-eval'; connect-src * 'unsafe-inline'; img-src * data: blob: 'unsafe-inline'; frame-src *; style-src * 'unsafe-inline';">
+			<meta http-equiv="Content-Security-Policy" content="default-src * 'unsafe-inline' 'unsafe-eval'; script-src * 'unsafe-inline' 'unsafe-eval'; connect-src * 'unsafe-inline'; img-src * data: blob: 'unsafe-inline'; frame-src *; style-src * 'unsafe-inline'; worker-src * data: 'unsafe-inline' 'unsafe-eval'; font-src * 'unsafe-inline' 'unsafe-eval';">
             <style>
                 html { height: 100%; width: 100%; padding: 0; margin: 0; }
                 body { height: 100%; width: 100%; padding: 0; margin: 0; }
@@ -74,6 +80,8 @@ export function getHtml(server: Server) {
 					window.webViewData = ${JSON.stringify({
 						serverSecret: server.secret,
 						serverPort: server.port,
+						publicPath: server.publicPath,
+						expression,
 					})};
 					const api = window.VsCodeApi = acquireVsCodeApi();
 					window.addEventListener('message', event => {
@@ -89,10 +97,11 @@ export function getHtml(server: Server) {
 						}
 					});
 				</script>
+				
 				${
 					isDev
 						? `<iframe sandbox="allow-top-navigation allow-scripts allow-same-origin allow-popups allow-pointer-lock allow-forms" src="${server.getIndexUrl(
-								{ mode: "webViewIFrame" }
+								{ mode: "webViewIFrame", expression }
 						  )}"></iframe>`
 						: `<script type="text/javascript" src="${server.mainBundleUrl}"></script>`
 				}

extension/src/contract.ts

@@ -18,9 +18,24 @@ function unchecked<T>(): types.Type<T, any, unknown> {
 	);
 }
 
+export type FormattedMessage =
+	| string
+	| {
+			kind: "list";
+			items: FormattedMessage[];
+	  }
+	| {
+			kind: "inlineList";
+			items: FormattedMessage[];
+	  }
+	| {
+			kind: "code";
+			content: string;
+	  };
+
 export type DataExtractionState =
 	| { kind: "loading" }
-	| { kind: "error"; message: string }
+	| { kind: "error"; message: FormattedMessage }
 	| { kind: "noDebugSession" }
 	| {
 			kind: "data";
@@ -85,6 +100,16 @@ export const debugVisualizerUIContract = contract({
 				newState: unchecked<DataExtractionState>(),
 			}),
 		}),
+		updateLanguageId: notificationContract({
+			params: types.type({
+				languageId: types.union([types.null, types.string]),
+			}),
+		}),
+		setExpression: requestContract({
+			params: types.type({
+				expression: types.string,
+			}),
+		}),
 	},
 	server: {
 		authenticate: requestContract({