/**
 * Jinja2/DTL Lexer - Tokenizes template source into tokens
 * Compatible with both Jinja2 and Django Template Language
 */
import { Token } from './tokens';
export declare class Lexer {
    private state;
    private variableStart;
    private variableEnd;
    private blockStart;
    private blockEnd;
    private commentStart;
    private commentEnd;
    constructor(source: string, options?: {
        variableStart?: string;
        variableEnd?: string;
        blockStart?: string;
        blockEnd?: string;
        commentStart?: string;
        commentEnd?: string;
    });
    tokenize(): Token[];
    private scanToken;
    private checkWord;
    private scanRawBlock;
    /**
     * Optimized scanText using indexOf
     * Instead of checking 3 delimiters at each character position,
     * we use indexOf to jump directly to the next '{' character.
     * Benchmarks show +178% average speedup, up to +393% for text-heavy templates.
     */
    private scanText;
    /** Advance to target position while tracking line/column */
    private advanceTo;
    /** Advance to end while tracking line/column */
    private advanceToEnd;
    private scanExpression;
    private scanExpressionToken;
    private scanString;
    private scanNumber;
    private scanIdentifier;
    private scanOperator;
    private scanComment;
    private isAtEnd;
    private peek;
    private peekNext;
    private advance;
    private match;
    private check;
    private skipWhitespace;
    private isWhitespace;
    private isDigit;
    private isAlpha;
    private isAlphaNumeric;
    private addToken;
}
export { TokenType, KEYWORDS } from './tokens';
export type { Token, LexerState } from './tokens';
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