/**
 * Query Preprocessor for Virtual Filesystem
 * Transforms SQL queries containing mcp:// URIs into executable DuckDB queries
 */
/**
 * Represents a URI replacement in a query
 */
export interface URIReplacement {
    uri: string;
    startPos: number;
    endPos: number;
    replacement: string;
    needsResolution: boolean;
}
/**
 * Query transformation result
 */
export interface TransformResult {
    originalQuery: string;
    transformedQuery: string;
    replacements: URIReplacement[];
    urisToResolve: string[];
}
/**
 * Preprocesses SQL queries to handle mcp:// URIs
 */
export declare class QueryPreprocessor {
    /**
     * Transform a SQL query by replacing mcp:// URIs
     * @param sql The original SQL query
     * @param resolver Function to resolve URIs to local paths
     * @returns Transformation result
     */
    static transform(sql: string, resolver: (uri: string) => Promise<string | null>): Promise<TransformResult>;
    /**
     * Build replacement string for a URI
     * @param localPath The local file path
     * @param format The data format
     * @returns Replacement SQL fragment
     */
    private static buildReplacement;
    /**
     * Find all occurrences of a URI in the query
     * @param sql The SQL query
     * @param uri The URI to find
     * @returns Array of positions
     */
    private static findOccurrences;
    /**
     * Replace URI in query with replacement
     * @param query The SQL query
     * @param uri The URI to replace
     * @param replacement The replacement string
     * @returns Modified query
     */
    private static replaceURI;
    /**
     * Escape special regex characters
     */
    private static escapeRegex;
    /**
     * Apply replacements to a query
     * @param sql The original SQL query
     * @param replacements The replacements to apply
     * @returns Transformed query
     */
    static applyReplacements(sql: string, replacements: URIReplacement[]): string;
    /**
     * Validate a transformed query
     * @param query The transformed query
     * @returns True if valid, false otherwise
     */
    static validate(query: string): boolean;
    /**
     * Expand glob patterns in a query
     * @param sql The SQL query
     * @param availableResources List of available resources
     * @returns Expanded query with all matching resources
     */
    static expandGlobs(sql: string, availableResources: Array<{
        server: string;
        path: string;
    }>): Promise<string>;
    /**
     * Extract table references from a query
     * @param sql The SQL query
     * @returns List of table names referenced
     */
    static extractTableReferences(sql: string): string[];
    /**
     * Check if a word is a SQL keyword
     */
    private static isKeyword;
}
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