import { Token } from "./ast.js";
import type { LexerInterface } from "./lexer.js";
import type { Source } from "./source.js";
/**
 * Given a Source schema coordinate, creates a Lexer for that source.
 * A SchemaCoordinateLexer is a stateful stream generator in that every time
 * it is advanced, it returns the next token in the Source. Assuming the
 * source lexes, the final Token emitted by the lexer will be of kind
 * EOF, after which the lexer will repeatedly return the same EOF token
 * whenever called.
 *
 * @internal
 */
export declare class SchemaCoordinateLexer implements LexerInterface {
    source: Source;
    /**
     * The previously focused non-ignored token.
     *
     * @internal
     */
    lastToken: Token;
    /**
     * The currently focused non-ignored token.
     *
     * @internal
     */
    token: Token;
    /**
     * The (1-indexed) line containing the current token.
     * Since a schema coordinate may not contain newline, this value is always 1.
     *
     * @internal
     */
    line: 1;
    /**
     * The character offset at which the current line begins.
     * Since a schema coordinate may not contain newline, this value is always 0.
     *
     * @internal
     */
    lineStart: 0;
    constructor(source: Source);
    get [Symbol.toStringTag](): string;
    /**
     * Advances the token stream to the next non-ignored token.
     *
     * @internal
     */
    advance(): Token;
    /**
     * Looks ahead and returns the next non-ignored token, but does not change
     * the current Lexer token.
     *
     * @internal
     */
    lookahead(): Token;
}