/**
 * Fast character classification utilities for SQL tokenization
 */
export declare class CharLookupTable {
    static isWhitespace(char: string): boolean;
    static isDigit(char: string): boolean;
    static isHexChar(char: string): boolean;
    static isOperatorSymbol(char: string): boolean;
    static isDelimiter(char: string): boolean;
    /**
     * Check if a character code represents a SQL delimiter or operator token boundary.
     * @param code - Character code to classify.
     * @returns True when the character code should terminate identifiers.
     */
    static isDelimiterCode(code: number): boolean;
    static isNamedParameterPrefix(char: string): boolean;
}