import type { Token, QueryLexerOptions } from './types';
export declare class QueryLexer {
    private input;
    private position;
    private options;
    constructor(options?: Partial<QueryLexerOptions>);
    tokenize(input: string): Token[];
    /**
     * Reset lexer to beginning of input
     */
    private reset;
    /**
     * Link tokens as a doubly linked list
     */
    private linkTokensAsLinkedList;
    /**
     * Check if we've reached the end of input
     */
    private isAtEnd;
    private nextToken;
    private currentChar;
    private createToken;
    private scanWhitespace;
    /**
     * Scan quoted string (single or double quotes)
     */
    private scanQuotedString;
    /**
     * Scan comparison operators (<=, >=, !=, <, >)
     */
    private scanComparator;
    /**
     * Scan word (could be one of: key / value / AND / OR
     */
    private scanWord;
    private scanLogicalOperator;
    /**
     * Advance position and update tracking
     */
    private advance;
    /**
     * Check if character is whitespace
     */
    private getIsWhitespace;
    /**
     * Check if character can start an identifier
     */
    private isIdentifierStart;
    /**
     * Check if character can be part of an identifier (key / value)
     */
    private isPartOfIdentifier;
    static getTokenAtPosition(tokens: Token[], position: number): Token | null;
}