import { State } from './state';
import { Token, TokenType } from './tokens';
export declare class Lexer {
    protected source: string;
    protected state: State;
    constructor(source: string);
    parse(): void;
    get currentToken(): Token;
    get previousToken(): Token;
    check(tokenType: TokenType): boolean;
    match(tokenType: TokenType): boolean;
    consume(tokenType: TokenType): Token;
    next(): Token | undefined;
    error(message: string): void;
    private readIdentifier;
    private readNumber;
    private readWord;
    private tokenize;
    private updateContext;
    private advanceInt;
    private advanceWhitespace;
    private advanceCharWhile;
    private advanceChar;
    private matchChar;
    private peekChar;
    private prevChar;
    private isAtEnd;
    private isIdentifier;
    private isAlpha;
    private isNumeric;
    private isAlphaNumeric;
    get currentContext(): import("./context").TokContext | null;
}