export declare class Lexer {
    static operators: string[];
    private result;
    private numberBuffer;
    private letterBuffer;
    constructor();
    tokenize(expr: string): Token[];
    private replaceConstants;
    private processNumberBuffer;
    private processLetterBuffer;
    private isComma;
    private isDigit;
    private isLetter;
    private isOperator;
    private isLeftParenthesis;
    private isRightParenthesis;
    private isDecimalPoint;
}
export declare enum TokenType {
    Literal = "Literal",
    Variable = "Variable",
    Operator = "Operator",
    LParenthesis = "LParenthesis",
    RParenthesis = "RParenthesis",
    Function = "Function",
    ArgSeperator = "ArgSeperator"
}
export declare class Token {
    type: TokenType;
    value: string | number;
    static associativity: {
        "^": string;
        "*": string;
        "/": string;
        "+": string;
        "-": string;
        "%": string;
        "&": string;
        "|": string;
    };
    static precedence: {
        "|": number;
        "&": number;
        "+": number;
        "-": number;
        "*": number;
        "/": number;
        "%": number;
        "^": number;
    };
    count: number;
    get precedence(): number;
    get associativity(): string;
    constructor(type: TokenType, value: string | number);
    toString(): string;
}