Utility Classes

/**
 * A helper class to build semantic tokens data arrays
 */
class SemanticTokensBuilder {
    /** Create a new semantic tokens builder */
    constructor();
    
    /**
     * Add a semantic token to the builder
     * @param line Line number (0-based)
     * @param char Character offset on line (0-based)  
     * @param length Length of the token in characters
     * @param tokenType Token type index from legend
     * @param tokenModifiers Token modifiers as bit flags from legend
     */
    push(line: number, char: number, length: number, tokenType: number, tokenModifiers?: number): void;
    
    /**
     * Build the final semantic tokens result
     * @returns SemanticTokens object with encoded data array
     */
    build(): SemanticTokens;
    
    /**
     * Build semantic tokens edits for delta requests
     * @returns SemanticTokensEdits for incremental updates
     */
    buildEdits(): SemanticTokensEdits;
}

import { SemanticTokensBuilder } from "vscode-languageserver";

// Define token types and modifiers indices (should match client capabilities)
const TokenTypes = {
    keyword: 0,
    function: 1,
    variable: 2,
    string: 3,
    number: 4,
    comment: 5
};

const TokenModifiers = {
    declaration: 1 << 0,
    definition: 1 << 1,
    readonly: 1 << 2,
    static: 1 << 3,
    deprecated: 1 << 4
};

connection.languages.semanticTokens.on((params) => {
    const document = documents.get(params.textDocument.uri);
    if (!document) return null;
    
    const builder = new SemanticTokensBuilder();
    
    const lines = document.getText().split('\n');
    lines.forEach((line, lineIndex) => {
        // Simple tokenization example
        const words = line.split(/\s+/);
        let charOffset = 0;
        
        words.forEach(word => {
            const wordStart = line.indexOf(word, charOffset);
            
            if (word === 'function') {
                builder.push(lineIndex, wordStart, word.length, TokenTypes.keyword, TokenModifiers.declaration);
            } else if (word.startsWith('"') && word.endsWith('"')) {
                builder.push(lineIndex, wordStart, word.length, TokenTypes.string);
            } else if (/^\d+$/.test(word)) {
                builder.push(lineIndex, wordStart, word.length, TokenTypes.number);
            } else if (word.startsWith('//')) {
                builder.push(lineIndex, wordStart, line.length - wordStart, TokenTypes.comment);
                break; // Rest of line is comment
            }
            
            charOffset = wordStart + word.length;
        });
    });
    
    return builder.build();
});

/**
 * Helps tracking error message. Equal occurrences of the same message are only stored once.
 * This class is useful if text documents are validated in a loop and equal error messages
 * should be folded into one.
 */
class ErrorMessageTracker {
    /** Create a new error message tracker */
    constructor();
    
    /**
     * Add a message to the tracker
     * @param message The message to add
     */
    add(message: string): void;
    
    /**
     * Send all tracked messages to the connection's window
     * @param connection The connection established between client and server
     */
    sendErrors(connection: { window: RemoteWindow }): void;
}

import { ErrorMessageTracker } from "vscode-languageserver";

const errorTracker = new ErrorMessageTracker();

// Validate multiple documents
documents.all().forEach(document => {
    try {
        validateDocument(document);
    } catch (error) {
        // Add errors to tracker (duplicates will be deduplicated)
        errorTracker.add(`Error in ${document.uri}: ${error.message}`);
    }
});

// Send all unique errors to client
errorTracker.sendErrors(connection);

/**
 * Interface for reporting work done progress
 */
interface WorkDoneProgressReporter {
    /**
     * Begin progress reporting
     * @param title The title of the progress
     * @param percentage Optional initial percentage (0-100)
     * @param message Optional initial message
     * @param cancellable Whether the operation can be cancelled
     */
    begin(title: string, percentage?: number, message?: string, cancellable?: boolean): void;
    
    /**
     * Report progress with percentage
     * @param percentage Progress percentage (0-100)
     */
    report(percentage: number): void;
    
    /**
     * Report progress with message
     * @param message Progress message
     */
    report(message: string): void;
    
    /**
     * Report progress with percentage and message
     * @param percentage Progress percentage (0-100)
     * @param message Optional progress message
     */
    report(percentage: number, message?: string): void;
    
    /** Complete the progress reporting */
    done(): void;
}

/**
 * Server-side work done progress reporter
 */
interface WorkDoneProgressServerReporter extends WorkDoneProgressReporter {
    /** The progress token */
    readonly token: ProgressToken;
}

/**
 * Interface for reporting partial results
 */
interface ResultProgressReporter<T> {
    /**
     * Report partial result data
     * @param data The partial result data
     */
    report(data: T): void;
}

connection.onWorkspaceSymbol((params, token, workDoneProgress, resultProgress) => {
    // Begin progress reporting
    workDoneProgress.begin('Searching workspace symbols');
    
    const allSymbols: SymbolInformation[] = [];
    const files = getAllWorkspaceFiles();
    
    files.forEach((file, index) => {
        // Report progress
        const percentage = Math.round((index / files.length) * 100);
        workDoneProgress.report(percentage, `Processing ${file}`);
        
        // Get symbols from file
        const symbols = getSymbolsFromFile(file, params.query);
        allSymbols.push(...symbols);
        
        // Report partial results
        if (symbols.length > 0) {
            resultProgress.report(symbols);
        }
        
        // Check for cancellation
        if (token.isCancellationRequested) {
            workDoneProgress.done();
            return null;
        }
    });
    
    // Complete progress
    workDoneProgress.done();
    return allSymbols;
});

/**
 * Interface for bulk capability registration
 */
interface BulkRegistration {
    /**
     * Add a registration to the bulk registration
     * @param type The request/notification type to register
     * @param registerOptions Optional registration options
     */
    add<RO>(type: ProtocolRequestType0<any, any, any, RO> | ProtocolNotificationType0<RO>, registerOptions?: RO): void;
    add<P, RO>(type: ProtocolRequestType<P, any, any, any, RO> | ProtocolNotificationType<P, RO>, registerOptions?: RO): void;
    
    /**
     * Convert to registration parameters for sending to client
     */
    asRegistrationParams(): RegistrationParams;
}

/**
 * Interface for bulk capability unregistration  
 */
interface BulkUnregistration extends Disposable {
    /**
     * Add an unregistration to the bulk unregistration
     * @param unregistration The unregistration to add
     */
    add(unregistration: Unregistration): void;
    
    /**
     * Convert to unregistration parameters for sending to client
     */
    asUnregistrationParams(): UnregistrationParams;
    
    /** Dispose all registrations */
    dispose(): void;
}

// Bulk register multiple capabilities
const bulkRegistration = BulkRegistration.create();
bulkRegistration.add(HoverRequest.type, { documentSelector: [{ scheme: 'file', language: 'typescript' }] });
bulkRegistration.add(CompletionRequest.type, { documentSelector: [{ scheme: 'file', language: 'typescript' }] });
bulkRegistration.add(DefinitionRequest.type, { documentSelector: [{ scheme: 'file', language: 'typescript' }] });

// Send bulk registration to client
connection.client.register(bulkRegistration.asRegistrationParams());

// Later, bulk unregister
const bulkUnregistration = BulkUnregistration.create();
bulkUnregistration.add({ id: 'hover-registration', method: 'textDocument/hover' });
bulkUnregistration.add({ id: 'completion-registration', method: 'textDocument/completion' });

connection.client.unregister(bulkUnregistration.asUnregistrationParams());

/**
 * UUID generation utilities
 */
namespace UUID {
    /**
     * Generate a new UUID v4
     * @returns A new UUID string
     */
    function generateUuid(): string;
}

import { UUID } from "vscode-languageserver";

// Generate unique identifiers for registrations
const registrationId = UUID.generateUuid();
const workDoneToken = UUID.generateUuid();

connection.client.register({
    registrations: [{
        id: registrationId,
        method: 'textDocument/hover',
        registerOptions: { documentSelector: [{ scheme: 'file' }] }
    }]
});

/**
 * Type checking utilities
 */
namespace Is {
    /** Check if value is a function */
    function func(value: any): value is Function;
    
    /** Check if value is a string */
    function string(value: any): value is string;
    
    /** Check if value is a number */
    function number(value: any): value is number;
    
    /** Check if value is a boolean */
    function boolean(value: any): value is boolean;
    
    /** Check if value is undefined */
    function undefined(value: any): value is undefined;
    
    /** Check if value is defined (not undefined) */
    function defined<T>(value: T | undefined): value is T;
}

import { Is } from "vscode-languageserver";

function processValue(value: any) {
    if (Is.string(value)) {
        // TypeScript knows value is string here
        return value.toUpperCase();
    } else if (Is.number(value)) {
        // TypeScript knows value is number here
        return value.toString();
    } else if (Is.defined(value)) {
        // TypeScript knows value is not undefined here
        return JSON.stringify(value);
    }
    return 'undefined';
}

interface SemanticTokens {
    /** An optional result id */
    resultId?: string;
    /** The actual tokens */
    data: number[];
}

interface SemanticTokensEdits {
    /** An optional result id */
    resultId?: string;
    /** The edits to transform a previous result into a new result */
    edits: SemanticTokensEdit[];
}

interface SemanticTokensEdit {
    /** The start offset of the edit */
    start: number;
    /** The count of elements to remove */
    deleteCount: number;
    /** The elements to insert */
    data?: number[];
}

interface RemoteWindow {
    /** Show an error message */
    showErrorMessage(message: string): void;
    /** Show a warning message */
    showWarningMessage(message: string): void;
    /** Show an information message */
    showInformationMessage(message: string): void;
}

type ProgressToken = number | string;

interface RegistrationParams {
    registrations: Registration[];
}

interface Registration {
    /** The id used to register the request */
    id: string;
    /** The method to register for */
    method: string;
    /** Options necessary for the registration */
    registerOptions?: any;
}

interface UnregistrationParams {
    unregisterations: Unregistration[];
}

interface Unregistration {
    /** The id used to unregister the request or notification */
    id: string;
    /** The method to unregister for */
    method: string;
}

interface Disposable {
    dispose(): void;
}