### 3D Force Graph Visualization Setup - TypeScript

Source: https://context7.com/typefox/language-engineering-visualization/llms.txt

This snippet showcases how to create an interactive 3D force-directed graph visualization of an AST using the `3d-force-graph` library. It involves fetching a serialized AST, deserializing it, converting it to a graph format, and configuring the 3D force graph for node selection, camera controls, and hierarchical layouts.

```typescript
import { AstNode, convertASTtoGraph, deserializeAST } from 'langium-ast-helper';
import ForceGraph3D from '3d-force-graph';

async function visualizeAST(dataFile: string, elementId: string) {
    // Fetch serialized AST
    const response = await fetch(`/data/${dataFile}`);
    const serializedAst = await response.text();

    // Deserialize and convert to graph
    const ast = deserializeAST(serializedAst);
    const graph = convertASTtoGraph(ast);

    // Transform to 3d-force-graph format
    const graphData = {
        nodes: graph.nodes.map(node => ({
            id: (node as any).$__dotID,
            nodeType: node.$type,
            node: node
        })),
        links: graph.edges.map(edge => ({
            source: (edge.from as any).$__dotID,
            target: (edge.to as any).$__dotID
        }))
    };

    // Create 3D visualization
    const element = document.getElementById(elementId);
    ForceGraph3D()(element)
        .dagMode('td') // top-down layout
        .width(800)
        .height(600)
        .nodeColor(node => `#${Math.floor(Math.random() * 16777215).toString(16)}`)
        .nodeLabel(node => node.nodeType)
        .linkDirectionalArrowLength(3.5)
        .linkDirectionalArrowRelPos(1)
        .cameraPosition({ z: 1400 })
        .onNodeClick(node => {
            console.log(`Clicked: ${node.nodeType}`);
            // Access full AST node
            console.log(node.node);
        })
        .graphData(graphData);
} 

// Initialize visualization
visualizeAST('langium-grammar.ast.json', 'graph-container');
```

--------------------------------

### Deserialize and Convert Langium AST to Graph (TypeScript)

Source: https://github.com/typefox/language-engineering-visualization/blob/main/packages/langium-ast-helper/README.md

This snippet demonstrates how to use the langium-ast-helper package to deserialize a JSON AST, convert it into a graph representation, and then transform that graph into a DOT program. It assumes you have a serialized AST (jsonAst) as input and shows the sequence of operations: deserialization, AST to graph conversion, and graph to DOT conversion.

```typescript
import { deserializeAST, convertASTtoGraph, convertGraphtoDOT } from 'langium-ast-helper';

// get a serialized AST from the cli, a build-phase listen from a worker, etc.
const jsonAst = ...;

// deserialize the AST, producing an object with cross references re-constructed
const ast = deserializeAST(jsonAst);

// convert the AST to nodes & edges graph representation
const graph = convertASTtoGraph(ast);

// convert this Graph representation into a DOT program
const dot = convertGraphtoDOT(graph);

// do something with your program!
console.log(dot);

```

--------------------------------

### Generate DOT Program from Graph (TypeScript)

Source: https://context7.com/typefox/language-engineering-visualization/llms.txt

Converts a graph representation into a DOT program string, suitable for rendering with Graphviz. This process involves deserializing the AST, converting it to a graph, and then converting the graph to a DOT program, which is then saved to a file. The program includes automatic node coloring.

```TypeScript
import { deserializeAST, convertASTtoGraph, convertGraphtoDOT } from 'langium-ast-helper';
import { readFileSync, writeFileSync } from 'fs';

// Full pipeline: deserialize -> graph -> DOT
const serializedAst = readFileSync('./data/langium-grammar.ast.json').toString();
const ast = deserializeAST(serializedAst);
const graph = convertASTtoGraph(ast);
const dot = convertGraphtoDOT(graph);

// Write DOT program to file
writeFileSync('grammar.dot', dot);

// Example DOT output:
// strict digraph {
// 0 [label="Grammar" style=filled fillcolor="#123456" fontcolor=white fontsize=32]
// 1 [label="Rule" style=filled fillcolor="#234567" fontcolor=white fontsize=32]
// 0 -> 1
// }

// Render with Graphviz CLI:
// $ dot -Tpng -o grammar.png grammar.dot
```

--------------------------------

### Convert AST to Graph Representation (TypeScript)

Source: https://context7.com/typefox/language-engineering-visualization/llms.txt

Transforms a deserialized Langium AST into a graph data structure (nodes and edges), suitable for graph visualization libraries. It uses `convertASTtoGraph` from the `langium-ast-helper` to convert the AST, and then iterates through the nodes and edges of the resulting graph.

```TypeScript
import { deserializeAST, convertASTtoGraph } from 'langium-ast-helper';
import { readFileSync } from 'fs';

// Deserialize AST
const serializedAst = readFileSync('./data/statemachine-grammar.ast.json').toString();
const ast = deserializeAST(serializedAst);

// Convert to graph representation
const graph = convertASTtoGraph(ast);

// Access graph data
console.log(`Graph contains ${graph.nodes.length} nodes`);
console.log(`Graph contains ${graph.edges.length} edges`);

// Iterate through nodes
graph.nodes.forEach(node => {
    console.log(`Node type: ${node.$type}`);
});

// Iterate through edges
graph.edges.forEach(edge => {
    console.log(`Edge: ${edge.from.$type} -> ${edge.to.$type}`);
});
```

--------------------------------

### Generate D3-Compatible TreeMap Data (TypeScript)

Source: https://context7.com/typefox/language-engineering-visualization/llms.txt

Transforms an AST into a hierarchical tree structure that is compatible with D3.js and other tree visualization libraries. The conversion includes generating a root node with color and size metadata, and children representing the AST's subtrees. The result is saved as a JSON file for use with D3.

```TypeScript
import { deserializeAST, convertASTtoTreeMap } from 'langium-ast-helper';
import { readFileSync, writeFileSync } from 'fs';

// Deserialize AST
const serializedAst = readFileSync('./data/domainmodel-grammar.ast.json').toString();
const ast = deserializeAST(serializedAst);

// Convert to TreeMap structure
const treemap = convertASTtoTreeMap(ast);

// Access TreeMap data
console.log(`Root: ${treemap.title}`);
console.log(`Color: ${treemap.color}`);
console.log(`Size: ${treemap.size}`);
console.log(`Children: ${treemap.children.length}`);

// TreeMap structure is D3-compatible
const treemapData = {
    title: "Grammar",
    color: "#123456",
    size: 15,
    children: [
        {
            title: "Rule",
            color: "#234567",
            size: 5,
            children: []
        }
    ]
};

// Use with D3.js treemap
writeFileSync('treemap-data.json', JSON.stringify(treemap, null, 2));
```

--------------------------------

### Deserialize Langium AST from JSON (TypeScript)

Source: https://context7.com/typefox/language-engineering-visualization/llms.txt

Deserializes a serialized Langium AST string, reconstructing the full AST with cross-references linked.  It uses the `deserializeAST` function from the `langium-ast-helper` library to restore the object graph.  The output includes AST properties and allows navigation of the AST structure.

```TypeScript
import { deserializeAST } from 'langium-ast-helper';
import { readFileSync } from 'fs';

// Load serialized AST from file
const serializedAst = readFileSync('./data/minilogo-program.ast.json').toString();

// Deserialize and reconstruct cross-references
const ast = deserializeAST(serializedAst);

// Access AST properties
console.log(ast.$type); // e.g., "Program"
console.log(ast.$container); // undefined for root node
console.log(ast.$containerProperty); // undefined for root node

// Navigate AST structure
if ('statements' in ast) {
    console.log(`Found ${ast.statements.length} statements`);
}

```

--------------------------------

### Extract All Cross-References - TypeScript

Source: https://context7.com/typefox/language-engineering-visualization/llms.txt

This snippet demonstrates how to extract all cross-references from an AST. It first deserializes a serialized AST and then uses the `getASTCrossRefs` function to retrieve the cross-references. The extracted references are then iterated to display their paths and resolved targets.

```typescript
import { deserializeAST, getASTCrossRefs } from 'langium-ast-helper';
import { readFileSync } from 'fs';

// Deserialize AST with cross-references
const serializedAst = readFileSync('./data/statemachine-grammar.ast.json').toString();
const ast = deserializeAST(serializedAst);

// Extract all cross-references
const crossRefs = getASTCrossRefs(ast);

console.log(`Found ${crossRefs.length} cross-references`);

// Iterate through cross-references
crossRefs.forEach(ref => {
    console.log(`Reference path: ${ref.$ref}`);
    if (ref.ref) {
        console.log(`Resolved to: ${ref.ref.$type}`);
        // Access referenced node properties
        if ('name' in ref.ref) {
            console.log(`Referenced name: ${ref.ref.name}`);
        }
    } else {
        console.log('Unresolved reference');
    }
});
```

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