import { type Token } from './token.js';
export declare class Lexer {
    private source;
    private pos;
    private line;
    private column;
    private file;
    constructor(source: string, file?: string);
    tokenize(): Token[];
    nextToken(): Token;
    /**
     * Scan SQL fragment from current position.
     * Called by the parser when it expects embedded SQL.
     * Scans until it finds: comma + identifier + equals at paren depth 0,
     * or a closing paren at depth 0.
     *
     * @param tokens - The token array to scan through
     * @param startIndex - Index in tokens where SQL starts
     * @returns { sql: string, endIndex: number } - The SQL text and the index after it
     */
    static scanSQLBoundary(source: string, startOffset: number, openParenDepth: number): {
        sql: string;
        endOffset: number;
    };
    private static skipStringInSQL;
    private readComment;
    private readString;
    private readNumber;
    private readIdentifierOrKeyword;
    private readPunctuation;
    private skipWhitespace;
    private peek;
    private peekNext;
    private advance;
    private isAtEnd;
    private isDigit;
    private isAlpha;
    private isAlphaNumeric;
    private readTripleQuoteString;
    private location;
    private makeToken;
}
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