181 lines
4.6 KiB
Markdown
181 lines
4.6 KiB
Markdown
# Debug Visualizer
|
|
|
|
[](https://twitter.com/intent/follow?screen_name=hediet_dev)
|
|
|
|
A VS Code extension for visualizing data structures during debugging.
|
|
|
|
|
|
|
|
## Usage
|
|
|
|
After installing this extension, use the command `Open a new Debug Visualizer 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, e.g.
|
|
|
|
```ts
|
|
{ kind: { graph: true }, nodes: [ { id: "1", label: "1" }, { id: "2", label: "2" } ], edges: [{ from: "1", to: "2", label: "edge" }]}
|
|
```
|
|
|
|
You can implement your own functions to extract this debug data from your custom data structures.
|
|
See [here](../data-extraction/README.md) for documentation of the `createGraphFromPointers` helper.
|
|
|
|
## Integrated Visualizers
|
|
|
|
Visualizers present data extracted by a _Data Extractor_.
|
|
Visualizers are (mostly) React components and live in the webview of the extension.
|
|
|
|
### Tree Visualization
|
|
|
|
The tree visualizer renders data that matches the `Tree` interface.
|
|
|
|
```ts
|
|
interface Tree<TData = unknown> {
|
|
kind: { tree: true };
|
|
root: TreeNode<TData>;
|
|
}
|
|
interface TreeNode<TExtraData> {
|
|
id: string | undefined;
|
|
name: string;
|
|
value: string | undefined;
|
|
emphasizedValue: string | undefined;
|
|
children: TreeNode<TExtraData>[];
|
|
data: TExtraData;
|
|
isMarked: boolean;
|
|
}
|
|
```
|
|
|
|
|
|
|
|
### AST Visualization
|
|
|
|
The AST visualizer renders data that matches the `Ast` interface.
|
|
|
|
```ts
|
|
interface Ast
|
|
extends Tree<{
|
|
position: number;
|
|
length: number;
|
|
}>,
|
|
Text {
|
|
kind: { text: true; tree: true; ast: true };
|
|
}
|
|
```
|
|
|
|
In addition to the tree view, the text representation is shown.
|
|
|
|
|
|
|
|
### Text Visualization
|
|
|
|
The text visualizer renders data that matches the `Text` interface.
|
|
|
|
```ts
|
|
interface Text {
|
|
kind: { text: true };
|
|
text: string;
|
|
mimeType?: string;
|
|
fileName?: string;
|
|
}
|
|
```
|
|
|
|
The `mimeType` and the file extension of `fileName` are used for syntax highlighting.
|
|
|
|
### SVG Visualization
|
|
|
|
The SVG visualizer renders data that matches the `Svg` interface.
|
|
The actual SVG data must be stored in `text`.
|
|
|
|
```ts
|
|
interface Svg extends Text {
|
|
kind: { text: true; svg: true };
|
|
}
|
|
```
|
|
|
|
### Dot Graph Visualization
|
|
|
|
The Graphviz Dot visualizer renders data that matches the `DotGraph` interface.
|
|
|
|
```ts
|
|
interface DotGraph extends Text {
|
|
kind: { text: true; dotGraph: true };
|
|
}
|
|
```
|
|
|
|
`Viz.js` (Graphviz) is used for rendering.
|
|
|
|
### Graph Visualization
|
|
|
|
The Graphviz and vis.js visualizers render data that matches the `Graph` interface.
|
|
|
|
```ts
|
|
interface Graph {
|
|
kind: { graph: true };
|
|
nodes: NodeGraphData[];
|
|
edges: EdgeGraphData[];
|
|
}
|
|
|
|
interface NodeGraphData {
|
|
id: string;
|
|
label: string;
|
|
color?: string;
|
|
}
|
|
|
|
interface EdgeGraphData {
|
|
from: string;
|
|
to: string;
|
|
label: string;
|
|
id?: string;
|
|
color?: string;
|
|
weight?: number;
|
|
}
|
|
```
|
|
|
|
The graphviz visualizer uses the SVG viewer to render the SVG created by `viz.js`.
|
|
|
|
|
|
|
|
|
|
## Integrated Data Extractors
|
|
|
|
Data extractors convert arbitrary values into visualizable data.
|
|
They live in the debugee. The following data extractors are injected automatically by this extension.
|
|
Custom data extractors can be registered too.
|
|
|
|
### ToString
|
|
|
|
Just calls `.toString()` on values and treats the result as text.
|
|
|
|
### TypeScript AST
|
|
|
|
- Direct Visualization of `ts.Node`s
|
|
- Visualization of `Record<string, ts.Node>` and `[ts.Node]`. If the record contains a key `fn`, its value is displayed for each node.
|
|
|
|
### As Is Data Extractor
|
|
|
|
Treats the data as direct input to the visualizer.
|
|
|
|
### Use Method 'getDebugVisualization'
|
|
|
|
Calls `.getDebugVisualization()` on values and treats the result as direct input to the visualizer.
|
|
|
|
## UI Features
|
|
|
|
- Multiline Expressions: Press `shift+enter` to add a new line, ctrl+enter to evaluate the expression.
|
|
Subsequent new lines can be inserted with a single `enter`.
|
|
|
|
## Limitations
|
|
|
|
Currently, only JavaScript (and thus TypeScript) values can be visualized and only a few visualizations are supported.
|
|
The architecture is solid enough to support other languages in the future.
|
|
|
|
# `@hediet/debug-visualizer-data-extraction`
|
|
|
|
A library that provides infrastructure to implement and register custom data extractors.
|
|
See [README](../data-extraction/README.md) of the library for more info.
|
|
|
|
# See Also
|
|
|
|
This extension works very well together with my library [`@hediet/node-reload`](https://github.com/hediet/node-reload).
|
|
Together, they provide an interactive typescript playground.
|
|
|
|
|