Special Extensions

/**
 * Extension for CodeMirror 6 binding the Yjs text and editor state
 * Enables real-time collaborative editing
 */
function ybinding(options: { ytext: Text; undoManager?: UndoManager }): Extension;

/**
 * Y.js range class for relative positioning
 */
class YRange {
  constructor(yanchor: RelativePosition, yhead: RelativePosition);
  
  /**
   * Convert the position to JSON
   */
  toJSON(): Range;
  
  /**
   * Convert a JSON range to a YRange
   */
  static fromJSON(json: Range): YRange;
}

/**
 * Y.js binding configuration
 */
class YSyncConfig {
  constructor(ytext: Text);
  
  readonly ytext: Text;
  
  /**
   * Transform absolute index position to Yjs-based relative position
   */
  toYPos(pos: number, assoc?: number): RelativePosition;
  
  /**
   * Transform relative position back to absolute position
   */
  fromYPos(rpos: RelativePosition | Record<string, any>): number;
  
  /**
   * Convert selection range to Y range
   */
  toYRange(range: SelectionRange): YRange;
  
  /**
   * Convert Y range to selection range
   */
  fromYRange(yrange: YRange): SelectionRange;
}

/**
 * Y.js undo manager integration
 */
class YUndoManagerConfig {
  constructor(undoManager: UndoManager);
  
  readonly undoManager: UndoManager;
}

// Facets and plugins
const ySyncFacet: Facet<YSyncConfig, YSyncConfig>;
const ySyncAnnotation: Annotation<YSyncConfig>;
const ySync: ViewPlugin;
const yUndoManagerFacet: Facet<YUndoManagerConfig, YUndoManagerConfig>;
const yUndoManager: ViewPlugin;

import { ybinding } from "@jupyterlab/codemirror";
import { Text, UndoManager } from "yjs";
import { WebsocketProvider } from "y-websocket";

// Create Y.js document and text
const ydoc = new Y.Doc();
const ytext = ydoc.getText('codemirror');
const undoManager = new UndoManager(ytext);

// Create collaborative editor
const editor = new EditorView({
  extensions: [
    ybinding({ ytext, undoManager }),
    // ... other extensions
  ],
  parent: document.body
});

// Set up network provider for real-time sync
const provider = new WebsocketProvider('ws://localhost:1234', 'my-room', ydoc);

// Handle collaboration events
provider.on('status', (event) => {
  console.log('Connection status:', event.status);
});

// Clean up
provider.destroy();
editor.destroy();

/**
 * Extension for CodeMirror 6 displaying rulers
 * Shows vertical lines at specified column positions
 */
function rulers(positions: number[]): Extension;

import { rulers } from "@jupyterlab/codemirror";

// Add rulers at columns 80 and 120
const rulerExtension = rulers([80, 120]);

// Create editor with rulers
const editor = new EditorView({
  extensions: [
    rulerExtension,
    // ... other extensions
  ]
});

// Dynamic ruler configuration
function createDynamicRulers(language: string): Extension {
  switch (language) {
    case 'python':
      return rulers([79, 88]); // PEP 8 guidelines
    case 'javascript':
    case 'typescript':
      return rulers([80, 100, 120]); // Common JS guidelines
    case 'java':
      return rulers([100, 120]); // Java conventions
    default:
      return rulers([80]); // Default ruler
  }
}

// Update rulers based on language
editor.dispatch({
  effects: StateEffect.reconfigure.of([
    createDynamicRulers('python'),
    // ... other extensions
  ])
});

/**
 * Get the extension to customize an editor theme
 * Allows dynamic font and spacing configuration
 */
function customTheme(config: CustomTheme): Extension;

/**
 * Editor customizable styles
 */
interface CustomTheme {
  fontFamily: string | null;
  fontSize: number | null;
  lineHeight: number | null;
}

import { customTheme, CustomTheme } from "@jupyterlab/codemirror";

// Create custom theme configuration
const themeConfig: CustomTheme = {
  fontFamily: 'Monaco, "Courier New", monospace',
  fontSize: 14,
  lineHeight: 1.5
};

// Apply custom theme
const customThemeExtension = customTheme(themeConfig);

const editor = new EditorView({
  extensions: [
    customThemeExtension,
    // ... other extensions
  ]
});

// Dynamic theme updates
function updateTheme(config: Partial<CustomTheme>) {
  const currentConfig = getCurrentThemeConfig();
  const newConfig = { ...currentConfig, ...config };
  
  editor.dispatch({
    effects: StateEffect.reconfigure.of([
      customTheme(newConfig),
      // ... other extensions
    ])
  });
}

// Update font size
updateTheme({ fontSize: 16 });

// Update font family
updateTheme({ fontFamily: 'JetBrains Mono, monospace' });

// Responsive font sizing
function createResponsiveTheme(): CustomTheme {
  const screenWidth = window.innerWidth;
  
  if (screenWidth < 768) {
    return { fontFamily: null, fontSize: 12, lineHeight: 1.4 }; // Mobile
  } else if (screenWidth < 1024) {
    return { fontFamily: null, fontSize: 13, lineHeight: 1.5 }; // Tablet
  } else {
    return { fontFamily: null, fontSize: 14, lineHeight: 1.6 }; // Desktop
  }
}

/**
 * Create a view plugin for highlighting Python built-in functions
 * Provides enhanced highlighting for Python's 158 built-in functions
 */
function pythonBuiltin(langPython: Language): ViewPlugin;

/**
 * View plugin class for highlighting Python built-in functions
 */
class PythonBuiltin {
  constructor(view: EditorView, langPython: Language);
  
  decorations: DecorationSet;
  decoratedTo: number;
  langPython: Language;
  tree: Tree;
  mark: Decoration;
  
  update(update: ViewUpdate): void;
  buildDeco(view: EditorView): DecorationSet;
}

/**
 * List of Python built-in function names (158 functions)
 */
const builtins: string[];

import { pythonBuiltin, builtins } from "@jupyterlab/codemirror";
import { python } from "@codemirror/lang-python";

// Create Python language support
const pythonLang = python();

// Add Python built-in highlighting
const pythonBuiltinExtension = pythonBuiltin(pythonLang.language);

const editor = new EditorView({
  extensions: [
    pythonLang,
    pythonBuiltinExtension,
    // ... other extensions
  ]
});

// Check if function is built-in
function isPythonBuiltin(functionName: string): boolean {
  return builtins.includes(functionName);
}

// Get all Python built-ins
console.log(`Python has ${builtins.length} built-in functions`);
console.log('Built-ins include:', builtins.slice(0, 10).join(', '));

// Custom built-in highlighting
function createCustomPythonHighlighting(additionalBuiltins: string[]) {
  const allBuiltins = [...builtins, ...additionalBuiltins];
  
  return ViewPlugin.fromClass(class {
    constructor(view: EditorView) {
      // Custom highlighting logic for extended built-ins
    }
    
    update(update: ViewUpdate) {
      // Update highlighting when document changes
    }
  });
}

/**
 * Define an IPython mathematical expression parser for Markdown
 * Enables LaTeX math rendering in Markdown cells
 */
function parseMathIPython(latexParser?: Parser): MarkdownConfig;

import { parseMathIPython } from "@jupyterlab/codemirror";
import { markdown } from "@codemirror/lang-markdown";

// Create IPython-compatible Markdown with math support
const ipythonMarkdown = markdown({
  extensions: [parseMathIPython()]
});

const editor = new EditorView({
  extensions: [
    ipythonMarkdown,
    // ... other extensions
  ]
});

// With custom LaTeX parser
import { LaTeX } from "@codemirror/lang-tex";

const customLatexParser = LaTeX.parser;
const ipythonMarkdownCustom = markdown({
  extensions: [parseMathIPython(customLatexParser)]
});

// Example IPython math content
const mathContent = `
# Mathematical Expressions

Inline math: $E = mc^2$

Block math:
$$
\\int_{-\\infty}^{\\infty} e^{-x^2} dx = \\sqrt{\\pi}
$$

IPython display math:
$$\\begin{align}
x &= \\frac{-b \\pm \\sqrt{b^2 - 4ac}}{2a} \\\\
y &= mx + b
\\end{align}$$
`;

// Set content with math expressions
editor.dispatch({
  changes: { from: 0, to: editor.state.doc.length, insert: mathContent }
});

// Collaborative Python development environment
async function createCollaborativePythonEditor(
  roomId: string,
  ytext: Text
): Promise<EditorView> {
  const pythonLang = python();
  const undoManager = new UndoManager(ytext);
  
  return new EditorView({
    extensions: [
      // Language support
      pythonLang,
      pythonBuiltin(pythonLang.language),
      
      // Collaboration
      ybinding({ ytext, undoManager }),
      
      // Visual aids
      rulers([79, 88]), // PEP 8 guidelines
      customTheme({
        fontFamily: 'JetBrains Mono, Monaco, monospace',
        fontSize: 13,
        lineHeight: 1.6
      }),
      
      // ... other extensions
    ],
    parent: document.body
  });
}

// Multi-language notebook cell
function createNotebookCell(language: string): Extension[] {
  const baseExtensions = [
    customTheme({
      fontFamily: 'var(--jp-code-font-family)',
      fontSize: null, // Use CSS variable
      lineHeight: null // Use CSS variable
    })
  ];
  
  switch (language) {
    case 'python':
      const pythonLang = python();
      return [
        ...baseExtensions,
        pythonLang,
        pythonBuiltin(pythonLang.language),
        rulers([79])
      ];
      
    case 'markdown':
      return [
        ...baseExtensions,
        markdown({ extensions: [parseMathIPython()] }),
        rulers([80])
      ];
      
    case 'javascript':
      return [
        ...baseExtensions,
        javascript(),
        rulers([80, 120])
      ];
      
    default:
      return baseExtensions;
  }
}

// Dynamic extension reconfiguration
function reconfigureSpecialExtensions(
  editor: EditorView,
  options: {
    collaboration?: { ytext: Text; undoManager?: UndoManager };
    rulers?: number[];
    customTheme?: CustomTheme;
    pythonBuiltins?: boolean;
    mathSupport?: boolean;
  }
) {
  const extensions: Extension[] = [];
  
  if (options.collaboration) {
    extensions.push(ybinding(options.collaboration));
  }
  
  if (options.rulers) {
    extensions.push(rulers(options.rulers));
  }
  
  if (options.customTheme) {
    extensions.push(customTheme(options.customTheme));
  }
  
  if (options.pythonBuiltins) {
    const pythonLang = python();
    extensions.push(pythonLang, pythonBuiltin(pythonLang.language));
  }
  
  if (options.mathSupport) {
    extensions.push(markdown({ extensions: [parseMathIPython()] }));
  }
  
  editor.dispatch({
    effects: StateEffect.reconfigure.of(extensions)
  });
}

// Y.js types
interface ID {
  client: number;
  clock: number;
}

interface Position {
  type: ID | null;
  tname: string | null;
  item: ID | null;
  assoc: number;
}

interface Range {
  yanchor: Position;
  yhead: Position;
}

// Custom theme types
interface CustomTheme {
  fontFamily: string | null;
  fontSize: number | null;
  lineHeight: number | null;
}

// Y.js binding functions
function ybinding(options: { ytext: Text; undoManager?: UndoManager }): Extension;

// Ruler function
function rulers(positions: number[]): Extension;

// Custom theme function
function customTheme(config: CustomTheme): Extension;

// Python built-in highlighting
function pythonBuiltin(langPython: Language): ViewPlugin;

// IPython math parsing
function parseMathIPython(latexParser?: Parser): MarkdownConfig;