import { StreamParser } from '@codemirror/language';
import { MarkdownEditorHighlightColor } from './types';
/**
 * Markdown highlighting for the source mode, as a CodeMirror stream parser.
 *
 * The package ships no Markdown grammar, and the source view only needs to
 * show structure, not parse it: markers are dimmed, headings, emphasis, code,
 * links and formulas are styled, and code blocks and `$$` blocks are tracked
 * across lines so their content is never read as Markdown. Inline state
 * (emphasis, a link being read) ends with the line.
 */
interface MarkdownStreamState {
    /** The fence that opened the code block the line is in. */
    fence: string | null;
    mathBlock: boolean;
    htmlComment: boolean;
    /** Whether a block marker can still start here: line start, after `>` or a list marker. */
    lineStart: boolean;
    heading: number;
    quote: boolean;
    /** The line before was quoted: a `>` here continues that quote. */
    quoteAbove: boolean;
    /** A top-level quote starts on this line, so a callout's marker can follow its `>`. */
    calloutLine: boolean;
    /** A list marker was read on this line, so `[ ]` is a task box. */
    item: boolean;
    /** The line starts with `|`: its pipes are cell borders. */
    table: boolean;
    strong: boolean;
    emphasis: boolean;
    strike: boolean;
    /** Inside `==text==`: where on the line its closing `==` is; -1 outside. */
    markEnd: number;
    /** Inside `<mark>`: its colour. */
    htmlMark: MarkdownEditorHighlightColor | null;
    /** 1 inside a link's `[label]`, 2 inside its `(destination)`. */
    link: 0 | 1 | 2;
}
export interface MarkdownStreamOptions {
    math: boolean;
    highlight: boolean;
    callouts: boolean;
}
/** Whether `line` closes a block opened by `fence`: the same character, at least as long. */
export declare function closesFence(line: string, fence: string): boolean;
/**
 * Whether the line starting at `lineStart` is inside a fenced code block (or
 * a `$$` block), counted from the top of `doc`: the keys that continue lists
 * must leave code alone.
 */
export declare function isInsideMarkdownFence(doc: string, lineStart: number, math: boolean): boolean;
export declare function markdownStreamParser(options: MarkdownStreamOptions): StreamParser<MarkdownStreamState>;
export {};