import type { ChartParseResult } from '@/types/chart';
/**
 * State machine parser for extracting chart XML tags from streaming tokens.
 * Handles partial tags split across multiple tokens.
 */
export declare class ChartTagParser {
    private state;
    private buffer;
    private pendingChart;
    private textOutput;
    private chartPlaceholders;
    private completedCharts;
    /**
     * Process a single token from the SSE stream
     */
    processToken(token: string): ChartParseResult;
    /**
     * Process a single character through the state machine
     */
    private processChar;
    private handleIdleState;
    private handleOpeningTagState;
    private handleInsideTagState;
    private handleClosingTagState;
    private parseOpeningTag;
    private finalizeChart;
    private parseChartJson;
    private getDefaultOptions;
    /**
     * Flush any remaining buffered content when stream ends.
     * Incomplete chart tags are treated as plain text.
     */
    flush(): ChartParseResult;
    /**
     * Reset parser state for a new message
     */
    reset(): void;
}
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