import type { UndEndNext } from '../../../util/iterator';
import type { Point } from '../rga/Point';
import type { Range } from '../rga/Range';
import type { SliceType } from '../slice';
import type { SliceStacking } from '../slice/constants';
import type { ChunkSlice } from '../util/ChunkSlice';
export type CharIterator<T> = UndEndNext<ChunkSlice<T>>;
export type CharPredicate<T> = (char: T) => boolean;
export type EditorPosition<T = string> = Point<T> | number | [at: number, anchor: 0 | 1];
export type EditorSelection<T = string> = Range<T> | [start: EditorPosition<T>, end?: EditorPosition<T>];
export type TextRangeUnit = 'point' | 'char' | 'word' | 'line' | 'vline' | 'vert' | 'block' | 'all';
export type ViewRange = [text: string, textPosition: number, slices: ViewSlice[]];
export type ViewSlice = [header: number, x1: number, x2: number, type: SliceType, data?: unknown];
export type ViewStyle = [stacking: SliceStacking, type: SliceType, data?: unknown];
/**
 * UI API which can be injected during various methods of the editor. Used to
 * perform editor function while taking into account the visual representation
 * of the document, such as word wrapping.
 */
export interface EditorUi<T = string> {
    /**
     * Visually skips to the end or beginning of the line. Visually as in, it will
     * respect the visual line breaks created by word wrapping.
     *
     * Skips just one line, regardless of the magnitude of the `steps` parameter.
     *
     * @param point The point from which to start skipping.
     * @param steps The direction to skip. Positive for forward, negative for
     *     backward. Does not respect the magnitude of the steps, always performs
     *     one step.
     * @returns The point after skipping the specified number of lines, or
     *     undefined if no such point exists.
     */
    eol?(point: Point<T>, steps: number): Point<T> | undefined;
    /**
     * Used when user presses "ArrowUp" or "ArrowDown" keys. It will skip to the
     * position in the next visual line, while trying to preserve the horizontal
     * offset from the beginning of the line.
     *
     * @param point The point from which to start skipping.
     * @param steps Number of lines to skip.
     * @returns The point after skipping the specified number of lines, or
     *     undefined if no such point exists.
     */
    vert?(point: Point<T>, steps: number): Point<T> | undefined;
}
export type MarkerUpdateTarget = 'type' | ['tag', index?: number] | ['data', index?: number];