/**
 * Source Code Processor
 *
 * Processes source code files for 50+ programming languages.
 * Uses extension-based detection as primary method (more reliable than MIME types for code).
 *
 * Key features:
 * - Supports 50+ programming languages via extension detection
 * - Handles exact filename matches (Dockerfile, Makefile, etc.)
 * - Line count truncation to prevent token overflow
 * - Language detection for syntax highlighting metadata
 *
 * Priority: 120 (lower priority - text-based content, processed after binary/document formats)
 *
 * @module processors/code/SourceCodeProcessor
 *
 * @example
 * ```typescript
 * import { sourceCodeProcessor, processSourceCode, isSourceCodeFile } from "./code/index.js";
 *
 * // Check if a file is source code
 * if (isSourceCodeFile("text/plain", "app.ts")) {
 *   const result = await processSourceCode({
 *     id: "file-123",
 *     name: "app.ts",
 *     mimetype: "text/plain",
 *     size: 1024,
 *     buffer: codeBuffer,
 *   });
 *
 *   if (result.success) {
 *     console.log(`Language: ${result.data.language}`);
 *     console.log(`Lines: ${result.data.lineCount}`);
 *   }
 * }
 * ```
 */
import { BaseFileProcessor } from "../base/BaseFileProcessor.js";
import type { FileInfo, ProcessorFileProcessingResult, ProcessOptions, ProcessedSourceCode } from "../../types/index.js";
import { detectLanguageFromFilename } from "../config/languageMap.js";
/**
 * Source Code Processor - handles 50+ programming languages.
 *
 * Uses extension-based detection as the primary method since MIME types
 * for source code are often unreliable (many are just "text/plain").
 *
 * Priority: 120 (lower priority than binary/document formats)
 *
 * @example
 * ```typescript
 * const processor = new SourceCodeProcessor();
 *
 * const result = await processor.processFile({
 *   id: "file-123",
 *   name: "main.py",
 *   mimetype: "text/plain",
 *   size: 2048,
 *   buffer: pythonCodeBuffer,
 * });
 *
 * if (result.success) {
 *   console.log(`Language: ${result.data.language}`); // "Python"
 * }
 * ```
 */
export declare class SourceCodeProcessor extends BaseFileProcessor<ProcessedSourceCode> {
    /**
     * Supported file extensions for source code.
     * Includes 50+ extensions covering all major programming languages.
     */
    private static readonly supportedExtensions;
    /**
     * Common MIME types for source code files.
     * Note: Extension-based detection is preferred as MIME types are often unreliable.
     */
    private static readonly supportedMimeTypes;
    constructor();
    /**
     * Override to use extension-based detection as primary method.
     * Source code MIME types are often unreliable (e.g., "text/plain" for .ts files),
     * so we check extensions first.
     *
     * Also handles exact filename matches for special files like Dockerfile, Makefile.
     *
     * @param mimetype - MIME type of the file (often unreliable for source code)
     * @param filename - Filename for extension-based detection
     * @returns true if the file is a supported source code file
     */
    isFileSupported(mimetype: string, filename: string): boolean;
    /**
     * Build the processed source code result.
     * Decodes the buffer as UTF-8, detects language, and truncates if needed.
     *
     * @param buffer - Raw file content
     * @param fileInfo - Original file information
     * @returns Processed source code with metadata
     */
    protected buildProcessedResult(buffer: Buffer, fileInfo: FileInfo): ProcessedSourceCode;
    /**
     * Extract file extension from filename.
     *
     * @param filename - Filename to extract extension from
     * @returns Extension with leading dot (e.g., ".ts") or null if no extension
     */
    private getExtension;
}
/**
 * Singleton instance of the SourceCodeProcessor.
 * Use this for all source code processing to share configuration.
 */
export declare const sourceCodeProcessor: SourceCodeProcessor;
/**
 * Check if a file is a source code file.
 *
 * @param mimetype - MIME type of the file
 * @param filename - Filename for extension-based detection
 * @returns true if the file is a supported source code file
 *
 * @example
 * ```typescript
 * if (isSourceCodeFile("text/plain", "app.ts")) {
 *   console.log("This is a TypeScript file");
 * }
 * ```
 */
export declare function isSourceCodeFile(mimetype: string, filename: string): boolean;
/**
 * Validate source code file size against configured limit.
 *
 * @param sizeBytes - File size in bytes
 * @returns true if the file size is within limits
 */
export declare function validateSourceCodeSize(sizeBytes: number): boolean;
/**
 * Process a source code file.
 *
 * @param fileInfo - File information (can include URL or buffer)
 * @param options - Optional processing options
 * @returns Processing result with success flag and either data or error
 *
 * @example
 * ```typescript
 * const result = await processSourceCode({
 *   id: "file-123",
 *   name: "main.py",
 *   mimetype: "text/plain",
 *   size: 2048,
 *   buffer: pythonCodeBuffer,
 * });
 *
 * if (result.success) {
 *   console.log(`Detected language: ${result.data.language}`);
 *   console.log(`Line count: ${result.data.lineCount}`);
 *   console.log(`Truncated: ${result.data.truncated}`);
 * }
 * ```
 */
export declare function processSourceCode(fileInfo: FileInfo, options?: ProcessOptions): Promise<ProcessorFileProcessingResult<ProcessedSourceCode>>;
/**
 * Alias for backward compatibility with Curator codebase.
 * Detects programming language from a filename.
 *
 * @param filename - The filename to detect language from
 * @returns The detected language name or 'Unknown'
 *
 * @example
 * ```typescript
 * detectLanguage("app.ts") // Returns "TypeScript"
 * detectLanguage("Dockerfile") // Returns "Dockerfile"
 * ```
 */
export declare const detectLanguage: typeof detectLanguageFromFilename;